diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-24 10:07:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-24 10:07:50 -0700 |
| commit | 3dab04e6978e358ad2307bca563fabd6c5d2c58b (patch) | |
| tree | 893e9bc5041e7f722722fe13a3b145396f2554d8 | |
| parent | 6d1e9a42e7176bbce9348274784b2e5f69223936 (diff) | |
| parent | 5a4b65ab506398ba5a35c37e06edddd387cc0add (diff) | |
| download | linux-3dab04e6978e358ad2307bca563fabd6c5d2c58b.tar.gz | |
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300: MN10300: gcc 4.6 vs am33 inline assembly MN10300: Deprecate gdbstub MN10300: Allow KGDB to use the MN10300 serial ports MN10300: Emulate single stepping in KGDB on MN10300 MN10300: Generalise kernel debugger kernel halt, reboot or power off hook KGDB: Notify GDB of machine halt, reboot or power off MN10300: Use KGDB MN10300: Create generic kernel debugger hooks MN10300: Create general kernel debugger cache flushing MN10300: Introduce a general config option for kernel debugger hooks MN10300: The icache invalidate functions should disable the icache first MN10300: gdbstub: Restrict single-stepping to non-preemptable non-SMP configs
39 files changed, 1924 insertions, 502 deletions
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig index 10971be43061..d8ab97a73db2 100644 --- a/arch/mn10300/Kconfig +++ b/arch/mn10300/Kconfig @@ -3,6 +3,8 @@ config MN10300 select HAVE_OPROFILE select HAVE_GENERIC_HARDIRQS select GENERIC_HARDIRQS_NO_DEPRECATED + select HAVE_ARCH_TRACEHOOK + select HAVE_ARCH_KGDB config AM33_2 def_bool n @@ -401,9 +403,9 @@ comment "[!] NOTE: A lower number/level indicates a higher priority (0 is highes comment "____Non-maskable interrupt levels____" comment "The following must be set to a higher priority than local_irq_disable() and on-chip serial" -config GDBSTUB_IRQ_LEVEL - int "GDBSTUB interrupt priority" - depends on GDBSTUB +config DEBUGGER_IRQ_LEVEL + int "DEBUGGER interrupt priority" + depends on KERNEL_DEBUGGER range 0 1 if LINUX_CLI_LEVEL = 2 range 0 2 if LINUX_CLI_LEVEL = 3 range 0 3 if LINUX_CLI_LEVEL = 4 @@ -437,7 +439,7 @@ config LINUX_CLI_LEVEL EPSW.IM from 7. Any interrupt is permitted for which the level is lower than EPSW.IM. - Certain interrupts, such as GDBSTUB and virtual MN10300 on-chip + Certain interrupts, such as DEBUGGER and virtual MN10300 on-chip serial DMA interrupts are allowed to interrupt normal disabled sections. diff --git a/arch/mn10300/Kconfig.debug b/arch/mn10300/Kconfig.debug index ce83c74b3fd7..bdbfd444a9ff 100644 --- a/arch/mn10300/Kconfig.debug +++ b/arch/mn10300/Kconfig.debug @@ -36,7 +36,7 @@ config KPROBES config GDBSTUB bool "Remote GDB kernel debugging" - depends on DEBUG_KERNEL + depends on DEBUG_KERNEL && DEPRECATED select DEBUG_INFO select FRAME_POINTER help @@ -46,6 +46,9 @@ config GDBSTUB RAM to avoid excessive linking time. This is only useful for kernel hackers. If unsure, say N. + This is deprecated in favour of KGDB and will be removed in a later + version. + config GDBSTUB_IMMEDIATE bool "Break into GDB stub immediately" depends on GDBSTUB @@ -54,6 +57,14 @@ config GDBSTUB_IMMEDIATE possible, leaving the program counter at the beginning of start_kernel() in init/main.c. +config GDBSTUB_ALLOW_SINGLE_STEP + bool "Allow software single-stepping in GDB stub" + depends on GDBSTUB && !SMP && !PREEMPT + help + Allow GDB stub to perform software single-stepping through the + kernel. This doesn't work very well on SMP or preemptible kernels as + it uses temporary breakpoints to emulate single-stepping. + config GDB_CONSOLE bool "Console output to GDB" depends on GDBSTUB @@ -142,3 +153,7 @@ config GDBSTUB_ON_TTYSx default y endmenu + +config KERNEL_DEBUGGER + def_bool y + depends on GDBSTUB || KGDB diff --git a/arch/mn10300/include/asm/debugger.h b/arch/mn10300/include/asm/debugger.h new file mode 100644 index 000000000000..e1d3b083696c --- /dev/null +++ b/arch/mn10300/include/asm/debugger.h @@ -0,0 +1,43 @@ +/* Kernel debugger for MN10300 + * + * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ + +#ifndef _ASM_DEBUGGER_H +#define _ASM_DEBUGGER_H + +#if defined(CONFIG_KERNEL_DEBUGGER) + +extern int debugger_intercept(enum exception_code, int, int, struct pt_regs *); +extern int at_debugger_breakpoint(struct pt_regs *); + +#ifndef CONFIG_MN10300_DEBUGGER_CACHE_NO_FLUSH +extern void debugger_local_cache_flushinv(void); +extern void debugger_local_cache_flushinv_one(u8 *); +#else +static inline void debugger_local_cache_flushinv(void) {} +static inline void debugger_local_cache_flushinv_one(u8 *addr) {} +#endif + +#else /* CONFIG_KERNEL_DEBUGGER */ + +static inline int debugger_intercept(enum exception_code excep, + int signo, int si_code, + struct pt_regs *regs) +{ + return 0; +} + +static inline int at_debugger_breakpoint(struct pt_regs *regs) +{ + return 0; +} + +#endif /* CONFIG_KERNEL_DEBUGGER */ +#endif /* _ASM_DEBUGGER_H */ diff --git a/arch/mn10300/include/asm/div64.h b/arch/mn10300/include/asm/div64.h index 34dcb8e68309..503efab2a516 100644 --- a/arch/mn10300/include/asm/div64.h +++ b/arch/mn10300/include/asm/div64.h @@ -16,6 +16,19 @@ extern void ____unhandled_size_in_do_div___(void); /* + * Beginning with gcc 4.6, the MDR register is represented explicitly. We + * must, therefore, at least explicitly clobber the register when we make + * changes to it. The following assembly fragments *could* be rearranged in + * order to leave the moves to/from the MDR register to the compiler, but the + * gains would be minimal at best. + */ +#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) +# define CLOBBER_MDR_CC "mdr", "cc" +#else +# define CLOBBER_MDR_CC "cc" +#endif + +/* * divide n by base, leaving the result in n and returning the remainder * - we can do this quite efficiently on the MN10300 by cascading the divides * through the MDR register @@ -29,7 +42,7 @@ extern void ____unhandled_size_in_do_div___(void); "mov mdr,%1 \n" \ : "+r"(n), "=d"(__rem) \ : "r"(base), "1"(__rem) \ - : "cc" \ + : CLOBBER_MDR_CC \ ); \ } else if (sizeof(n) <= 8) { \ union { \ @@ -48,7 +61,7 @@ extern void ____unhandled_size_in_do_div___(void); : "=d"(__rem), "=r"(__quot.w[1]), "=r"(__quot.w[0]) \ : "r"(base), "0"(__rem), "1"(__quot.w[1]), \ "2"(__quot.w[0]) \ - : "cc" \ + : CLOBBER_MDR_CC \ ); \ n = __quot.l; \ } else { \ @@ -72,7 +85,7 @@ unsigned __muldiv64u(unsigned val, unsigned mult, unsigned div) * MDR = MDR:val%div */ : "=r"(result) : "0"(val), "ir"(mult), "r"(div) - : "cc" + : CLOBBER_MDR_CC ); return result; @@ -93,7 +106,7 @@ signed __muldiv64s(signed val, signed mult, signed div) * MDR = MDR:val%div */ : "=r"(result) : "0"(val), "ir"(mult), "r"(div) - : "cc" + : CLOBBER_MDR_CC ); return result; diff --git a/arch/mn10300/include/asm/fpu.h b/arch/mn10300/include/asm/fpu.h index b7625de8eade..738ff72659d5 100644 --- a/arch/mn10300/include/asm/fpu.h +++ b/arch/mn10300/include/asm/fpu.h @@ -55,7 +55,6 @@ static inline void clear_using_fpu(struct task_struct *tsk) extern asmlinkage void fpu_kill_state(struct task_struct *); extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code); -extern asmlinkage void fpu_invalid_op(struct pt_regs *, enum exception_code); extern asmlinkage void fpu_init_state(void); extern asmlinkage void fpu_save(struct fpu_state_struct *); extern int fpu_setup_sigcontext(struct fpucontext *buf); @@ -113,7 +112,6 @@ static inline void flush_fpu(void) extern asmlinkage void unexpected_fpu_exception(struct pt_regs *, enum exception_code); -#define fpu_invalid_op unexpected_fpu_exception #define fpu_exception unexpected_fpu_exception struct task_struct; diff --git a/arch/mn10300/include/asm/irqflags.h b/arch/mn10300/include/asm/irqflags.h index 7a7ae12c7119..678f68d5f37b 100644 --- a/arch/mn10300/include/asm/irqflags.h +++ b/arch/mn10300/include/asm/irqflags.h @@ -20,7 +20,7 @@ /* * interrupt control * - "disabled": run in IM1/2 - * - level 0 - GDB stub + * - level 0 - kernel debugger * - level 1 - virtual serial DMA (if present) * - level 5 - normal interrupt priority * - level 6 - timer interrupt diff --git a/arch/mn10300/include/asm/kgdb.h b/arch/mn10300/include/asm/kgdb.h new file mode 100644 index 000000000000..eb245f18a708 --- /dev/null +++ b/arch/mn10300/include/asm/kgdb.h @@ -0,0 +1,81 @@ +/* Kernel debugger for MN10300 + * + * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ + +#ifndef _ASM_KGDB_H +#define _ASM_KGDB_H + +/* + * BUFMAX defines the maximum number of characters in inbound/outbound + * buffers at least NUMREGBYTES*2 are needed for register packets + * Longer buffer is needed to list all threads + */ +#define BUFMAX 1024 + +/* + * Note that this register image is in a different order than the register + * image that Linux produces at interrupt time. + */ +enum regnames { + GDB_FR_D0 = 0, + GDB_FR_D1 = 1, + GDB_FR_D2 = 2, + GDB_FR_D3 = 3, + GDB_FR_A0 = 4, + GDB_FR_A1 = 5, + GDB_FR_A2 = 6, + GDB_FR_A3 = 7, + + GDB_FR_SP = 8, + GDB_FR_PC = 9, + GDB_FR_MDR = 10, + GDB_FR_EPSW = 11, + GDB_FR_LIR = 12, + GDB_FR_LAR = 13, + GDB_FR_MDRQ = 14, + + GDB_FR_E0 = 15, + GDB_FR_E1 = 16, + GDB_FR_E2 = 17, + GDB_FR_E3 = 18, + GDB_FR_E4 = 19, + GDB_FR_E5 = 20, + GDB_FR_E6 = 21, + GDB_FR_E7 = 22, + + GDB_FR_SSP = 23, + GDB_FR_MSP = 24, + GDB_FR_USP = 25, + GDB_FR_MCRH = 26, + GDB_FR_MCRL = 27, + GDB_FR_MCVF = 28, + + GDB_FR_FPCR = 29, + GDB_FR_DUMMY0 = 30, + GDB_FR_DUMMY1 = 31, + + GDB_FR_FS0 = 32, + + GDB_FR_SIZE = 64, +}; + +#define GDB_ORIG_D0 41 +#define NUMREGBYTES (GDB_FR_SIZE*4) + +static inline void arch_kgdb_breakpoint(void) +{ + asm(".globl __arch_kgdb_breakpoint; __arch_kgdb_breakpoint: break"); +} +extern u8 __arch_kgdb_breakpoint; + +#define BREAK_INSTR_SIZE 1 +#define CACHE_FLUSH_IS_SAFE 1 + +#endif /* _ASM_KGDB_H */ diff --git a/arch/mn10300/include/asm/smp.h b/arch/mn10300/include/asm/smp.h index a3930e43a958..6745dbe64944 100644 --- a/arch/mn10300/include/asm/smp.h +++ b/arch/mn10300/include/asm/smp.h @@ -34,7 +34,7 @@ #define LOCAL_TIMER_IPI 193 #define FLUSH_CACHE_IPI 194 #define CALL_FUNCTION_NMI_IPI 195 -#define GDB_NMI_IPI 196 +#define DEBUGGER_NMI_IPI 196 #define SMP_BOOT_IRQ 195 @@ -43,6 +43,7 @@ #define LOCAL_TIMER_GxICR_LV GxICR_LEVEL_4 #define FLUSH_CACHE_GxICR_LV GxICR_LEVEL_0 #define SMP_BOOT_GxICR_LV GxICR_LEVEL_0 +#define DEBUGGER_GxICR_LV CONFIG_DEBUGGER_IRQ_LEVEL #define TIME_OUT_COUNT_BOOT_IPI 100 #define DELAY_TIME_BOOT_IPI 75000 @@ -61,8 +62,9 @@ * An alternate way of dealing with this could be to use the EPSW.S bits to * cache this information for systems with up to four CPUs. */ +#define arch_smp_processor_id() (CPUID) #if 0 -#define raw_smp_processor_id() (CPUID) +#define raw_smp_processor_id() (arch_smp_processor_id()) #else #define raw_smp_processor_id() (current_thread_info()->cpu) #endif diff --git a/arch/mn10300/include/asm/thread_info.h b/arch/mn10300/include/asm/thread_info.h index 8d53f09c878d..87c213002d4c 100644 --- a/arch/mn10300/include/asm/thread_info.h +++ b/arch/mn10300/include/asm/thread_info.h @@ -131,7 +131,11 @@ static inline unsigned long current_stack_pointer(void) kmalloc_node(THREAD_SIZE, GFP_KERNEL, node) #endif +#ifndef CONFIG_KGDB #define free_thread_info(ti) kfree((ti)) +#else +extern void free_thread_info(struct thread_info *); +#endif #define get_thread_info(ti) get_task_struct((ti)->task) #define put_thread_info(ti) put_task_struct((ti)->task) diff --git a/arch/mn10300/kernel/Makefile b/arch/mn10300/kernel/Makefile index a06a2e10051d..47ed30fe8178 100644 --- a/arch/mn10300/kernel/Makefile +++ b/arch/mn10300/kernel/Makefile @@ -21,11 +21,8 @@ obj-$(CONFIG_GDBSTUB) += gdb-stub.o gdb-low.o obj-$(CONFIG_GDBSTUB_ON_TTYSx) += gdb-io-serial.o gdb-io-serial-low.o obj-$(CONFIG_GDBSTUB_ON_TTYSMx) += gdb-io-ttysm.o gdb-io-ttysm-low.o -ifeq ($(CONFIG_MN10300_CACHE_ENABLED),y) -obj-$(CONFIG_GDBSTUB) += gdb-cache.o -endif - obj-$(CONFIG_MN10300_RTC) += rtc.o obj-$(CONFIG_PROFILE) += profile.o profile-low.o obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_KPROBES) += kprobes.o +obj-$(CONFIG_KGDB) += kgdb.o diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S index f00b9bafcd3e..fb93ad720b82 100644 --- a/arch/mn10300/kernel/entry.S +++ b/arch/mn10300/kernel/entry.S @@ -266,7 +266,11 @@ ENTRY(raw_bus_error) ############################################################################### # -# Miscellaneous exception entry points +# NMI exception entry points +# +# This is used by ordinary interrupt channels that have the GxICR_NMI bit set +# in addition to the main NMI and Watchdog channels. SMP NMI IPIs use this +# facility. # ############################################################################### ENTRY(nmi_handler) @@ -281,7 +285,7 @@ ENTRY(nmi_handler) and NMIAGR_GN,d0 lsr 0x2,d0 cmp CALL_FUNCTION_NMI_IPI,d0 - bne 5f # if not call function, jump + bne nmi_not_smp_callfunc # if not call function, jump # function call nmi ipi add 4,sp # no need to store TBR @@ -295,59 +299,38 @@ ENTRY(nmi_handler) call smp_nmi_call_function_interrupt[],0 RESTORE_ALL -5: -#ifdef CONFIG_GDBSTUB - cmp GDB_NMI_IPI,d0 - bne 3f # if not gdb nmi ipi, jump +nmi_not_smp_callfunc: +#ifdef CONFIG_KERNEL_DEBUGGER + cmp DEBUGGER_NMI_IPI,d0 + bne nmi_not_debugger # if not kernel debugger NMI IPI, jump - # gdb nmi ipi + # kernel debugger NMI IPI add 4,sp # no need to store TBR mov GxICR_DETECT,d0 # clear NMI - movbu d0,(GxICR(GDB_NMI_IPI)) - movhu (GxICR(GDB_NMI_IPI)),d0 + movbu d0,(GxICR(DEBUGGER_NMI_IPI)) + movhu (GxICR(DEBUGGER_NMI_IPI)),d0 and ~EPSW_NMID,epsw # enable NMI -#ifdef CONFIG_MN10300_CACHE_ENABLED - mov (gdbstub_nmi_opr_type),d0 - cmp GDBSTUB_NMI_CACHE_PURGE,d0 - bne 4f # if not gdb cache purge, jump - - # gdb cache purge nmi ipi - add -20,sp - mov d1,(4,sp) - mov a0,(8,sp) - mov a1,(12,sp) - mov mdr,d0 - mov d0,(16,sp) - call gdbstub_local_purge_cache[],0 - mov 0x1,d0 - mov (CPUID),d1 - asl d1,d0 - mov gdbstub_nmi_cpumask,a0 - bclr d0,(a0) - mov (4,sp),d1 - mov (8,sp),a0 - mov (12,sp),a1 - mov (16,sp),d0 - mov d0,mdr - add 20,sp - mov (sp),d0 - add 4,sp - rti -4: -#endif /* CONFIG_MN10300_CACHE_ENABLED */ - # gdb wait nmi ipi + mov (sp),d0 SAVE_ALL - call gdbstub_nmi_wait[],0 + mov fp,d0 # arg 0: stacked register file + mov a2,d1 # arg 1: exception number + call debugger_nmi_interrupt[],0 RESTORE_ALL -3: -#endif /* CONFIG_GDBSTUB */ + +nmi_not_debugger: +#endif /* CONFIG_KERNEL_DEBUGGER */ mov (sp),d0 # restore TBR to d0 add 4,sp #endif /* CONFIG_SMP */ bra __common_exception_nonmi +############################################################################### +# +# General exception entry point +# +############################################################################### ENTRY(__common_exception) add -4,sp mov d0,(sp) diff --git a/arch/mn10300/kernel/fpu.c b/arch/mn10300/kernel/fpu.c index 5f9c3fa19a85..bb5fa7df6c44 100644 --- a/arch/mn10300/kernel/fpu.c +++ b/arch/mn10300/kernel/fpu.c @@ -70,24 +70,6 @@ asmlinkage void fpu_exception(struct pt_regs *regs, enum exception_code code) } /* - * handle an FPU invalid_op exception - * - Derived from DO_EINFO() macro in arch/mn10300/kernel/traps.c - */ -asmlinkage void fpu_invalid_op(struct pt_regs *regs, enum exception_code code) -{ - siginfo_t info; - - if (!user_mode(regs)) - die_if_no_fixup("FPU invalid opcode", regs, code); - - info.si_signo = SIGILL; - info.si_errno = 0; - info.si_code = ILL_COPROC; - info.si_addr = (void *) regs->pc; - force_sig_info(info.si_signo, &info, current); -} - -/* * save the FPU state to a signal context */ int fpu_setup_sigcontext(struct fpucontext *fpucontext) diff --git a/arch/mn10300/kernel/gdb-cache.S b/arch/mn10300/kernel/gdb-cache.S deleted file mode 100644 index 1108badc3d32..000000000000 --- a/arch/mn10300/kernel/gdb-cache.S +++ /dev/null @@ -1,105 +0,0 @@ -############################################################################### -# -# MN10300 Low-level cache purging routines for gdbstub -# -# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. -# Written by David Howells (dhowells@redhat.com) -# -# This program is free software; you can redistribute it and/or -# modify it under the terms of the GNU General Public Licence -# as published by the Free Software Foundation; either version -# 2 of the Licence, or (at your option) any later version. -# -############################################################################### -#include <linux/sys.h> -#include <linux/linkage.h> -#include <asm/smp.h> -#include <asm/cache.h> -#include <asm/cpu-regs.h> -#include <asm/exceptions.h> -#include <asm/frame.inc> -#include <asm/serial-regs.h> - - .text - -############################################################################### -# -# GDB stub cache purge -# -############################################################################### - .type gdbstub_purge_cache,@function -ENTRY(gdbstub_purge_cache) - ####################################################################### - # read the addresses tagged in the cache's tag RAM and attempt to flush - # those addresses specifically - # - we rely on the hardware to filter out invalid tag entry addresses - mov DCACHE_TAG(0,0),a0 # dcache tag RAM access address - mov DCACHE_PURGE(0,0),a1 # dcache purge request address - mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of entries - -mn10300_dcache_flush_loop: - mov (a0),d0 - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0 - or L1_CACHE_TAG_VALID,d0 # retain valid entries in the - # cache - mov d0,(a1) # conditional purge - -mn10300_dcache_flush_skip: - add L1_CACHE_BYTES,a0 - add L1_CACHE_BYTES,a1 - add -1,d1 - bne mn10300_dcache_flush_loop - -;; # unconditionally flush and invalidate the dcache -;; mov DCACHE_PURGE(0,0),a1 # dcache purge request address -;; mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of -;; # entries -;; -;; gdbstub_purge_cache__dcache_loop: -;; mov (a1),d0 # unconditional purge -;; -;; add L1_CACHE_BYTES,a1 -;; add -1,d1 -;; bne gdbstub_purge_cache__dcache_loop - - ####################################################################### - # now invalidate the icache - mov CHCTR,a0 - movhu (a0),a1 - - mov epsw,d1 - and ~EPSW_IE,epsw - nop - nop - - # disable the icache - and ~CHCTR_ICEN,d0 - movhu d0,(a0) - - # and wait for it to calm down - setlb - movhu (a0),d0 - btst CHCTR_ICBUSY,d0 - lne - - # invalidate - or CHCTR_ICINV,d0 - movhu d0,(a0) - - # wait for the cache to finish - mov CHCTR,a0 - setlb - movhu (a0),d0 - btst CHCTR_ICBUSY,d0 - lne - - # and reenable it - movhu a1,(a0) - movhu (a0),d0 # read back to flush - # (SIGILLs all over without this) - - mov d1,epsw - - ret [],0 - - .size gdbstub_purge_cache,.-gdbstub_purge_cache diff --git a/arch/mn10300/kernel/gdb-io-ttysm.c b/arch/mn10300/kernel/gdb-io-ttysm.c index abdeea153c89..c859cacbb9c3 100644 --- a/arch/mn10300/kernel/gdb-io-ttysm.c +++ b/arch/mn10300/kernel/gdb-io-ttysm.c @@ -59,10 +59,10 @@ void __init gdbstub_io_init(void) /* we want to get serial receive interrupts */ set_intr_level(gdbstub_port->rx_irq, - NUM2GxICR_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL)); + NUM2GxICR_LEVEL(CONFIG_DEBUGGER_IRQ_LEVEL)); set_intr_level(gdbstub_port->tx_irq, - NUM2GxICR_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL)); - set_intr_stub(NUM2EXCEP_IRQ_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL), + NUM2GxICR_LEVEL(CONFIG_DEBUGGER_IRQ_LEVEL)); + set_intr_stub(NUM2EXCEP_IRQ_LEVEL(CONFIG_DEBUGGER_IRQ_LEVEL), gdbstub_io_rx_handler); *gdbstub_port->rx_icr |= GxICR_ENABLE; @@ -88,7 +88,7 @@ void __init gdbstub_io_init(void) /* permit level 0 IRQs only */ arch_local_change_intr_mask_level( - NUM2EPSW_IM(CONFIG_GDBSTUB_IRQ_LEVEL + 1)); + NUM2EPSW_IM(CONFIG_DEBUGGER_IRQ_LEVEL + 1)); } /* diff --git a/arch/mn10300/kernel/gdb-stub.c b/arch/mn10300/kernel/gdb-stub.c index b169d99d9f20..538266b2c9bc 100644 --- a/arch/mn10300/kernel/gdb-stub.c +++ b/arch/mn10300/kernel/gdb-stub.c @@ -133,7 +133,7 @@ #include <asm/system.h> #include <asm/gdb-stub.h> #include <asm/exceptions.h> -#include <asm/cacheflush.h> +#include <asm/debugger.h> #include <asm/serial-regs.h> #include <asm/busctl-regs.h> #include <unit/leds.h> @@ -405,6 +405,7 @@ static int hexToInt(char **ptr, int *intValue) return (numChars); } +#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP /* * We single-step by setting breakpoints. When an exception * is handled, we need to restore the instructions hoisted @@ -729,6 +730,7 @@ static int gdbstub_single_step(struct pt_regs *regs) __gdbstub_restore_bp(); return -EFAULT; } +#endif /* CONFIG_GDBSTUB_ALLOW_SINGLE_STEP */ #ifdef CONFIG_GDBSTUB_CONSOLE @@ -1171,7 +1173,7 @@ int gdbstub_clear_breakpoint(u8 *addr, int len) /* * This function does all command processing for interfacing to gdb - * - returns 1 if the exception should be skipped, 0 otherwise. + * - returns 0 if the exception should be skipped, -ERROR otherwise. */ static int gdbstub(struct pt_regs *regs, enum exception_code excep) { @@ -1186,7 +1188,7 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep) int loop; if (excep == EXCEP_FPU_DISABLED) - return 0; + return -ENOTSUPP; gdbstub_flush_caches = 0; @@ -1195,7 +1197,7 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep) asm volatile("mov mdr,%0" : "=d"(mdr)); local_save_flags(epsw); arch_local_change_intr_mask_level( - NUM2EPSW_IM(CONFIG_GDBSTUB_IRQ_LEVEL + 1)); + NUM2EPSW_IM(CONFIG_DEBUGGER_IRQ_LEVEL + 1)); gdbstub_store_fpu(); @@ -1208,11 +1210,13 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep) /* if we were single stepping, restore the opcodes hoisted for the * breakpoint[s] */ broke = 0; +#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP if ((step_bp[0].addr && step_bp[0].addr == (u8 *) regs->pc) || (step_bp[1].addr && step_bp[1].addr == (u8 *) regs->pc)) broke = 1; __gdbstub_restore_bp(); +#endif if (gdbstub_rx_unget) { sigval = SIGINT; @@ -1548,17 +1552,21 @@ packet_waiting: * Step to next instruction */ case 's': - /* - * using the T flag doesn't seem to perform single + /* Using the T flag doesn't seem to perform single * stepping (it seems to wind up being caught by the * JTAG unit), so we have to use breakpoints and * continue instead. */ +#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP if (gdbstub_single_step(regs) < 0) /* ignore any fault error for now */ gdbstub_printk("unable to set single-step" " bp\n"); goto done; +#else + gdbstub_strcpy(output_buffer, "E01"); + break; +#endif /* * Set baud rate (bBB) @@ -1657,7 +1665,7 @@ done: * NB: We flush both caches, just to be sure... */ if (gdbstub_flush_caches) - gdbstub_purge_cache(); + debugger_local_cache_flushinv(); gdbstub_load_fpu(); mn10300_set_gdbleds(0); @@ -1667,14 +1675,23 @@ done: touch_softlockup_watchdog(); local_irq_restore(epsw); - return 1; + return 0; +} + +/* + * Determine if we hit a debugger special breakpoint that needs skipping over + * automatically. + */ +int at_debugger_breakpoint(struct pt_regs *regs) +{ + return 0; } /* * handle event interception */ -asmlinkage int gdbstub_intercept(struct pt_regs *regs, - enum exception_code excep) +asmlinkage int debugger_intercept(enum exception_code excep, + int signo, int si_code, struct pt_regs *regs) { static u8 notfirst = 1; int ret; @@ -1688,7 +1705,7 @@ asmlinkage int gdbstub_intercept(struct pt_regs *regs, asm("mov mdr,%0" : "=d"(mdr)); gdbstub_entry( - "--> gdbstub_intercept(%p,%04x) [MDR=%lx PC=%lx]\n", + "--> debugger_intercept(%p,%04x) [MDR=%lx PC=%lx]\n", regs, excep, mdr, regs->pc); gdbstub_entry( @@ -1722,7 +1739,7 @@ asmlinkage int gdbstub_intercept(struct pt_regs *regs, ret = gdbstub(regs, excep); - gdbstub_entry("<-- gdbstub_intercept()\n"); + gdbstub_entry("<-- debugger_intercept()\n"); gdbstub_busy = 0; return ret; } diff --git a/arch/mn10300/kernel/internal.h b/arch/mn10300/kernel/internal.h index ea946613f46d..a5ac755dd69f 100644 --- a/arch/mn10300/kernel/internal.h +++ b/arch/mn10300/kernel/internal.h @@ -30,6 +30,13 @@ extern void mn10300_low_ipi_handler(void); #endif /* + * smp.c + */ +#ifdef CONFIG_SMP +extern void smp_jump_to_debugger(void); +#endif + +/* * time.c */ extern irqreturn_t local_timer_interrupt(void); diff --git a/arch/mn10300/kernel/irq.c b/arch/mn10300/kernel/irq.c index f09fed5e6afc..5f7fc3eb45e6 100644 --- a/arch/mn10300/kernel/irq.c +++ b/arch/mn10300/kernel/irq.c @@ -153,7 +153,7 @@ mn10300_cpupic_setaffinity(struct irq_data *d, const struct cpumask *mask, case LOCAL_TIMER_IPI: case FLUSH_CACHE_IPI: case CALL_FUNCTION_NMI_IPI: - case GDB_NMI_IPI: + case DEBUGGER_NMI_IPI: #ifdef CONFIG_MN10300_TTYSM0 case SC0RXIRQ: case SC0TXIRQ: diff --git a/arch/mn10300/kernel/kgdb.c b/arch/mn10300/kernel/kgdb.c new file mode 100644 index 000000000000..f6c981db2a36 --- /dev/null +++ b/arch/mn10300/kernel/kgdb.c @@ -0,0 +1,502 @@ +/* kgdb support for MN10300 + * + * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ + +#include <linux/slab.h> +#include <linux/ptrace.h> +#include <linux/kgdb.h> +#include <linux/uaccess.h> +#include <unit/leds.h> +#include <unit/serial.h> +#include <asm/debugger.h> +#include <asm/serial-regs.h> +#include "internal.h" + +/* + * Software single-stepping breakpoint save (used by __switch_to()) + */ +static struct thread_info *kgdb_sstep_thread; +u8 *kgdb_sstep_bp_addr[2]; +u8 kgdb_sstep_bp[2]; + +/* + * Copy kernel exception frame registers to the GDB register file + */ +void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) +{ + unsigned long ssp = (unsigned long) (regs + 1); + + gdb_regs[GDB_FR_D0] = regs->d0; + gdb_regs[GDB_FR_D1] = regs->d1; + gdb_regs[GDB_FR_D2] = regs->d2; + gdb_regs[GDB_FR_D3] = regs->d3; + gdb_regs[GDB_FR_A0] = regs->a0; + gdb_regs[GDB_FR_A1] = regs->a1; + gdb_regs[GDB_FR_A2] = regs->a2; + gdb_regs[GDB_FR_A3] = regs->a3; + gdb_regs[GDB_FR_SP] = (regs->epsw & EPSW_nSL) ? regs->sp : ssp; + gdb_regs[GDB_FR_PC] = regs->pc; + gdb_regs[GDB_FR_MDR] = regs->mdr; + gdb_regs[GDB_FR_EPSW] = regs->epsw; + gdb_regs[GDB_FR_LIR] = regs->lir; + gdb_regs[GDB_FR_LAR] = regs->lar; + gdb_regs[GDB_FR_MDRQ] = regs->mdrq; + gdb_regs[GDB_FR_E0] = regs->e0; + gdb_regs[GDB_FR_E1] = regs->e1; + gdb_regs[GDB_FR_E2] = regs->e2; + gdb_regs[GDB_FR_E3] = regs->e3; + gdb_regs[GDB_FR_E4] = regs->e4; + gdb_regs[GDB_FR_E5] = regs->e5; + gdb_regs[GDB_FR_E6] = regs->e6; + gdb_regs[GDB_FR_E7] = regs->e7; + gdb_regs[GDB_FR_SSP] = ssp; + gdb_regs[GDB_FR_MSP] = 0; + gdb_regs[GDB_FR_USP] = regs->sp; + gdb_regs[GDB_FR_MCRH] = regs->mcrh; + gdb_regs[GDB_FR_MCRL] = regs->mcrl; + gdb_regs[GDB_FR_MCVF] = regs->mcvf; + gdb_regs[GDB_FR_DUMMY0] = 0; + gdb_regs[GDB_FR_DUMMY1] = 0; + gdb_regs[GDB_FR_FS0] = 0; +} + +/* + * Extracts kernel SP/PC values understandable by gdb from the values + * saved by switch_to(). + */ +void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) +{ + gdb_regs[GDB_FR_SSP] = p->thread.sp; + gdb_regs[GDB_FR_PC] = p->thread.pc; + gdb_regs[GDB_FR_A3] = p->thread.a3; + gdb_regs[GDB_FR_USP] = p->thread.usp; + gdb_regs[GDB_FR_FPCR] = p->thread.fpu_state.fpcr; +} + +/* + * Fill kernel exception frame registers from the GDB register file + */ +void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) +{ + regs->d0 = gdb_regs[GDB_FR_D0]; + regs->d1 = gdb_regs[GDB_FR_D1]; + regs->d2 = gdb_regs[GDB_FR_D2]; + regs->d3 = gdb_regs[GDB_FR_D3]; + regs->a0 = gdb_regs[GDB_FR_A0]; + regs->a1 = gdb_regs[GDB_FR_A1]; + regs->a2 = gdb_regs[GDB_FR_A2]; + regs->a3 = gdb_regs[GDB_FR_A3]; + regs->sp = gdb_regs[GDB_FR_SP]; + regs->pc = gdb_regs[GDB_FR_PC]; + regs->mdr = gdb_regs[GDB_FR_MDR]; + regs->epsw = gdb_regs[GDB_FR_EPSW]; + regs->lir = gdb_regs[GDB_FR_LIR]; + regs->lar = gdb_regs[GDB_FR_LAR]; + regs->mdrq = gdb_regs[GDB_FR_MDRQ]; + regs->e0 = gdb_regs[GDB_FR_E0]; + regs->e1 = gdb_regs[GDB_FR_E1]; + regs->e2 = gdb_regs[GDB_FR_E2]; + regs->e3 = gdb_regs[GDB_FR_E3]; + regs->e4 = gdb_regs[GDB_FR_E4]; + regs->e5 = gdb_regs[GDB_FR_E5]; + regs->e6 = gdb_regs[GDB_FR_E6]; + regs->e7 = gdb_regs[GDB_FR_E7]; + regs->sp = gdb_regs[GDB_FR_SSP]; + /* gdb_regs[GDB_FR_MSP]; */ + // regs->usp = gdb_regs[GDB_FR_USP]; + regs->mcrh = gdb_regs[GDB_FR_MCRH]; + regs->mcrl = gdb_regs[GDB_FR_MCRL]; + regs->mcvf = gdb_regs[GDB_FR_MCVF]; + /* gdb_regs[GDB_FR_DUMMY0]; */ + /* gdb_regs[GDB_FR_DUMMY1]; */ + + // regs->fpcr = gdb_regs[GDB_FR_FPCR]; + // regs->fs0 = gdb_regs[GDB_FR_FS0]; +} + +struct kgdb_arch arch_kgdb_ops = { + .gdb_bpt_instr = { 0xff }, + .flags = KGDB_HW_BREAKPOINT, +}; + +static const unsigned char mn10300_kgdb_insn_sizes[256] = +{ + /* 1 2 3 4 5 6 7 8 9 a b c d e f */ + 1, 3, 3, 3, 1, 3, 3, 3, 1, 3, 3, 3, 1, 3, 3, 3, /* 0 */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 1 */ + 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, /* 2 */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, /* 3 */ + 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, /* 4 */ + 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, /* 5 */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 6 */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 7 */ + 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* 8 */ + 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* 9 */ + 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* a */ + 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* b */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 2, 2, /* c */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* d */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* e */ + 0, 2, 2, 2, 2, 2, 2, 4, 0, 3, 0, 4, 0, 6, 7, 1 /* f */ +}; + +/* + * Attempt to emulate single stepping by means of breakpoint instructions. + * Although there is a single-step trace flag in EPSW, its use is not + * sufficiently documented and is only intended for use with the JTAG debugger. + */ +static int kgdb_arch_do_singlestep(struct pt_regs *regs) +{ + unsigned long arg; + unsigned size; + u8 *pc = (u8 *)regs->pc, *sp = (u8 *)(regs + 1), cur; + u8 *x = NULL, *y = NULL; + int ret; + + ret = probe_kernel_read(&cur, pc, 1); + if (ret < 0) + return ret; + + size = mn10300_kgdb_insn_sizes[cur]; + if (size > 0) { + x = pc + size; + goto set_x; + } + + switch (cur) { + /* Bxx (d8,PC) */ + case 0xc0 ... 0xca: + ret = probe_kernel_read(&arg, pc + 1, 1); + if (ret < 0) + return ret; + x = pc + 2; + if (arg >= 0 && arg <= 2) + goto set_x; + y = pc + (s8)arg; + goto set_x_and_y; + + /* LXX (d8,PC) */ + case 0xd0 ... 0xda: + x = pc + 1; + if (regs->pc == regs->lar) + goto set_x; + y = (u8 *)regs->lar; + goto set_x_and_y; + + /* SETLB - loads the next four bytes into the LIR register + * (which mustn't include a breakpoint instruction) */ + case 0xdb: + x = pc + 5; + goto set_x; + + /* JMP (d16,PC) or CALL (d16,PC) */ + case 0xcc: + case 0xcd: + ret = probe_kernel_read(&arg, pc + 1, 2); + if (ret < 0) + return ret; + x = pc + (s16)arg; + goto set_x; + + /* JMP (d32,PC) or CALL (d32,PC) */ + case 0xdc: + case 0xdd: + ret = probe_kernel_read(&arg, pc + 1, 4); + if (ret < 0) + return ret; + x = pc + (s32)arg; + goto set_x; + + /* RETF */ + case 0xde: + x = (u8 *)regs->mdr; + goto set_x; + + /* RET */ + case 0xdf: + ret = probe_kernel_read(&arg, pc + 2, 1); + if (ret < 0) + return ret; + ret = probe_kernel_read(&x, sp + (s8)arg, 4); + if (ret < 0) + return ret; + goto set_x; + + case 0xf0: + ret = probe_kernel_read(&cur, pc + 1, 1); + if (ret < 0) + return ret; + + if (cur >= 0xf0 && cur <= 0xf7) { + /* JMP (An) / CALLS (An) */ + switch (cur & 3) { + case 0: x = (u8 *)regs->a0; break; + case 1: x = (u8 *)regs->a1; break; + case 2: x = (u8 *)regs->a2; break; + case 3: x = (u8 *)regs->a3; break; + } + goto set_x; + } else if (cur == 0xfc) { + /* RETS */ + ret = probe_kernel_read(&x, sp, 4); + if (ret < 0) + return ret; + goto set_x; + } else if (cur == 0xfd) { + /* RTI */ + ret = probe_kernel_read(&x, sp + 4, 4); + if (ret < 0) + return ret; + goto set_x; + } else { + x = pc + 2; + goto set_x; + } + break; + + /* potential 3-byte conditional branches */ + case 0xf8: + ret = probe_kernel_read(&cur, pc + 1, 1); + if (ret < 0) + return ret; + x = pc + 3; + + if (cur >= 0xe8 && cur <= 0xeb) { + ret = probe_kernel_read(&arg, pc + 2, 1); + if (ret < 0) + return ret; + if (arg >= 0 && arg <= 3) + goto set_x; + y = pc + (s8)arg; + goto set_x_and_y; + } + goto set_x; + + case 0xfa: + ret = probe_kernel_read(&cur, pc + 1, 1); + if (ret < 0) + return ret; + + if (cur == 0xff) { + /* CALLS (d16,PC) */ + ret = probe_kernel_read(&arg, pc + 2, 2); + if (ret < 0) + return ret; + x = pc + (s16)arg; + goto set_x; + } + + x = pc + 4; + goto set_x; + + case 0xfc: + ret = probe_kernel_read(&cur, pc + 1, 1); + if (ret < 0) + return ret; + + if (cur == 0xff) { + /* CALLS (d32,PC) */ + ret = probe_kernel_read(&arg, pc + 2, 4); + if (ret < 0) + return ret; + x = pc + (s32)arg; + goto set_x; + } + + x = pc + 6; + goto set_x; + } + + return 0; + +set_x: + kgdb_sstep_bp_addr[0] = x; + kgdb_sstep_bp_addr[1] = NULL; + ret = probe_kernel_read(&kgdb_sstep_bp[0], x, 1); + if (ret < 0) + return ret; + ret = probe_kernel_write(x, &arch_kgdb_ops.gdb_bpt_instr, 1); + if (ret < 0) + return ret; + kgdb_sstep_thread = current_thread_info(); + debugger_local_cache_flushinv_one(x); + return ret; + +set_x_and_y: + kgdb_sstep_bp_addr[0] = x; + kgdb_sstep_bp_addr[1] = y; + ret = probe_kernel_read(&kgdb_sstep_bp[0], x, 1); + if (ret < 0) + return ret; + ret = probe_kernel_read(&kgdb_sstep_bp[1], y, 1); + if (ret < 0) + return ret; + ret = probe_kernel_write(x, &arch_kgdb_ops.gdb_bpt_instr, 1); + if (ret < 0) + return ret; + ret = probe_kernel_write(y, &arch_kgdb_ops.gdb_bpt_instr, 1); + if (ret < 0) { + probe_kernel_write(kgdb_sstep_bp_addr[0], + &kgdb_sstep_bp[0], 1); + } else { + kgdb_sstep_thread = current_thread_info(); + } + debugger_local_cache_flushinv_one(x); + debugger_local_cache_flushinv_one(y); + return ret; +} + +/* + * Remove emplaced single-step breakpoints, returning true if we hit one of + * them. + */ +static bool kgdb_arch_undo_singlestep(struct pt_regs *regs) +{ + bool hit = false; + u8 *x = kgdb_sstep_bp_addr[0], *y = kgdb_sstep_bp_addr[1]; + u8 opcode; + + if (kgdb_sstep_thread == current_thread_info()) { + if (x) { + if (x == (u8 *)regs->pc) + hit = true; + if (probe_kernel_read(&opcode, x, + 1) < 0 || + opcode != 0xff) + BUG(); + probe_kernel_write(x, &kgdb_sstep_bp[0], 1); + debugger_local_cache_flushinv_one(x); + } + if (y) { + if (y == (u8 *)regs->pc) + hit = true; + if (probe_kernel_read(&opcode, y, + 1) < 0 || + opcode != 0xff) + BUG(); + probe_kernel_write(y, &kgdb_sstep_bp[1], 1); + debugger_local_cache_flushinv_one(y); + } + } + + kgdb_sstep_bp_addr[0] = NULL; + kgdb_sstep_bp_addr[1] = NULL; + kgdb_sstep_thread = NULL; + return hit; +} + +/* + * Catch a single-step-pending thread being deleted and make sure the global + * single-step state is cleared. At this point the breakpoints should have + * been removed by __switch_to(). + */ +void free_thread_info(struct thread_info *ti) +{ + if (kgdb_sstep_thread == ti) { + kgdb_sstep_thread = NULL; + + /* However, we may now be running in degraded mode, with most + * of the CPUs disabled until such a time as KGDB is reentered, + * so force immediate reentry */ + kgdb_breakpoint(); + } + kfree(ti); +} + +/* + * Handle unknown packets and [CcsDk] packets + * - at this point breakpoints have been installed + */ +int kgdb_arch_handle_exception(int vector, int signo, int err_code, + char *remcom_in_buffer, char *remcom_out_buffer, + struct pt_regs *regs) +{ + long addr; + char *ptr; + + switch (remcom_in_buffer[0]) { + case 'c': + case 's': + /* try to read optional parameter, pc unchanged if no parm */ + ptr = &remcom_in_buffer[1]; + if (kgdb_hex2long(&ptr, &addr)) + regs->pc = addr; + case 'D': + case 'k': + atomic_set(&kgdb_cpu_doing_single_step, -1); + + if (remcom_in_buffer[0] == 's') { + kgdb_arch_do_singlestep(regs); + kgdb_single_step = 1; + atomic_set(&kgdb_cpu_doing_single_step, + raw_smp_processor_id()); + } + return 0; + } + return -1; /* this means that we do not want to exit from the handler */ +} + +/* + * Handle event interception + * - returns 0 if the exception should be skipped, -ERROR otherwise. + */ +int debugger_intercept(enum exception_code excep, int signo, int si_code, + struct pt_regs *regs) +{ + int ret; + + if (kgdb_arch_undo_singlestep(regs)) { + excep = EXCEP_TRAP; + signo = SIGTRAP; + si_code = TRAP_TRACE; + } + + ret = kgdb_handle_exception(excep, signo, si_code, regs); + + debugger_local_cache_flushinv(); + + return ret; +} + +/* + * Determine if we've hit a debugger special breakpoint + */ +int at_debugger_breakpoint(struct pt_regs *regs) +{ + return regs->pc == (unsigned long)&__arch_kgdb_breakpoint; +} + +/* + * Initialise kgdb + */ +int kgdb_arch_init(void) +{ + return 0; +} + +/* + * Do something, perhaps, but don't know what. + */ +void kgdb_arch_exit(void) +{ +} + +#ifdef CONFIG_SMP +void debugger_nmi_interrupt(struct pt_regs *regs, enum exception_code code) +{ + kgdb_nmicallback(arch_smp_processor_id(), regs); + debugger_local_cache_flushinv(); +} + +void kgdb_roundup_cpus(unsigned long flags) +{ + smp_jump_to_debugger(); +} +#endif diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c index 93c53739cfc9..efca426a2ed4 100644 --- a/arch/mn10300/kernel/mn10300-serial.c +++ b/arch/mn10300/kernel/mn10300-serial.c @@ -119,6 +119,10 @@ static int mn10300_serial_request_port(struct uart_port *); static void mn10300_serial_config_port(struct uart_port *, int); static int mn10300_serial_verify_port(struct uart_port *, struct serial_struct *); +#ifdef CONFIG_CONSOLE_POLL +static void mn10300_serial_poll_put_char(struct uart_port *, unsigned char); +static int mn10300_serial_poll_get_char(struct uart_port *); +#endif static const struct uart_ops mn10300_serial_ops = { .tx_empty = mn10300_serial_tx_empty, @@ -138,6 +142,10 @@ static const struct uart_ops mn10300_serial_ops = { .request_port = mn10300_serial_request_port, .config_port = mn10300_serial_config_port, .verify_port = mn10300_serial_verify_port, +#ifdef CONFIG_CONSOLE_POLL + .poll_put_char = mn10300_serial_poll_put_char, + .poll_get_char = mn10300_serial_poll_get_char, +#endif }; static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id); @@ -1634,3 +1642,70 @@ static int __init mn10300_serial_console_init(void) console_initcall(mn10300_serial_console_init); #endif + +#ifdef CONFIG_CONSOLE_POLL +/* + * Polled character reception for the kernel debugger + */ +static int mn10300_serial_poll_get_char(struct uart_port *_port) +{ + struct mn10300_serial_port *port = + container_of(_port, struct mn10300_serial_port, uart); + unsigned ix; + u8 st, ch; + + _enter("%s", port->name); + + do { + /* pull chars out of the hat */ + ix = port->rx_outp; + if (ix == port->rx_inp) + return NO_POLL_CHAR; + + ch = port->rx_buffer[ix++]; + st = port->rx_buffer[ix++]; + smp_rmb(); + port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1); + + } while (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF)); + + return ch; +} + + +/* + * Polled character transmission for the kernel debugger + */ +static void mn10300_serial_poll_put_char(struct uart_port *_port, + unsigned char ch) +{ + struct mn10300_serial_port *port = + container_of(_port, struct mn10300_serial_port, uart); + u8 intr, tmp; + + /* wait for the transmitter to finish anything it might be doing (and + * this includes the virtual DMA handler, so it might take a while) */ + while (*port->_status & (SC01STR_TBF | SC01STR_TXF)) + continue; + + /* disable the Tx ready interrupt */ + intr = *port->_intr; + *port->_intr = intr & ~SC01ICR_TI; + tmp = *port->_intr; + + if (ch == 0x0a) { + *(u8 *) port->_txb = 0x0d; + while (*port->_status & SC01STR_TBF) + continue; + } + + *(u8 *) port->_txb = ch; + while (*port->_status & SC01STR_TBF) + continue; + + /* restore the Tx interrupt flag */ + *port->_intr = intr; + tmp = *port->_intr; +} + +#endif /* CONFIG_CONSOLE_POLL */ diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c index e1b14a6ed544..28eec3102535 100644 --- a/arch/mn10300/kernel/process.c +++ b/arch/mn10300/kernel/process.c @@ -135,7 +135,7 @@ void release_segments(struct mm_struct *mm) void machine_restart(char *cmd) { -#ifdef CONFIG_GDBSTUB +#ifdef CONFIG_KERNEL_DEBUGGER gdbstub_exit(0); #endif @@ -148,14 +148,14 @@ void machine_restart(char *cmd) void machine_halt(void) { -#ifdef CONFIG_GDBSTUB +#ifdef CONFIG_KERNEL_DEBUGGER gdbstub_exit(0); #endif } void machine_power_off(void) { -#ifdef CONFIG_GDBSTUB +#ifdef CONFIG_KERNEL_DEBUGGER gdbstub_exit(0); #endif } diff --git a/arch/mn10300/kernel/smp.c b/arch/mn10300/kernel/smp.c index 1ebb79f1650d..51c02f97dcea 100644 --- a/arch/mn10300/kernel/smp.c +++ b/arch/mn10300/kernel/smp.c @@ -440,6 +440,22 @@ int smp_nmi_call_function(smp_call_func_t func, void *info, int wait) } /** + * smp_jump_to_debugger - Make other CPUs enter the debugger by sending an IPI + * + * Send a non-maskable request to all other CPUs in the system, instructing + * them to jump into the debugger. The caller is responsible for checking that + * the other CPUs responded to the instruction. + * + * The caller should make sure that this CPU's debugger IPI is disabled. + */ +void smp_jump_to_debugger(void) +{ + if (num_online_cpus() > 1) + /* Send a message to all other CPUs */ + send_IPI_allbutself(DEBUGGER_NMI_IPI); +} + +/** * stop_this_cpu - Callback to stop a CPU. * @unused: Callback context (ignored). */ @@ -603,7 +619,7 @@ static void __init smp_cpu_init(void) /** * smp_prepare_cpu_init - Initialise CPU in startup_secondary * - * Set interrupt level 0-6 setting and init ICR of gdbstub. + * Set interrupt level 0-6 setting and init ICR of the kernel debugger. */ void smp_prepare_cpu_init(void) { @@ -622,15 +638,15 @@ void smp_prepare_cpu_init(void) for (loop = 0; loop < GxICR_NUM_IRQS; loop++) GxICR(loop) = GxICR_LEVEL_6 | GxICR_DETECT; -#ifdef CONFIG_GDBSTUB - /* initialise GDB-stub */ +#ifdef CONFIG_KERNEL_DEBUGGER + /* initialise the kernel debugger interrupt */ do { unsigned long flags; u16 tmp16; flags = arch_local_cli_save(); - GxICR(GDB_NMI_IPI) = GxICR_NMI | GxICR_ENABLE | GxICR_DETECT; - tmp16 = GxICR(GDB_NMI_IPI); + GxICR(DEBUGGER_NMI_IPI) = GxICR_NMI | GxICR_ENABLE | GxICR_DETECT; + tmp16 = GxICR(DEBUGGER_NMI_IPI); arch_local_irq_restore(flags); } while (0); #endif diff --git a/arch/mn10300/kernel/switch_to.S b/arch/mn10300/kernel/switch_to.S index 9074d0fb8788..de3e74fc9ea0 100644 --- a/arch/mn10300/kernel/switch_to.S +++ b/arch/mn10300/kernel/switch_to.S @@ -39,11 +39,17 @@ ENTRY(__switch_to) # save prev context mov __switch_back,d0 - mov d0,(THREAD_PC,a0) mov sp,a2 mov a2,(THREAD_SP,a0) mov a3,(THREAD_A3,a0) +#ifdef CONFIG_KGDB + btst 0xff,(kgdb_single_step) + bne __switch_to__lift_sstep_bp +__switch_to__continue: +#endif + mov d0,(THREAD_PC,a0) + mov (THREAD_A3,a1),a3 mov (THREAD_SP,a1),a2 @@ -68,3 +74,106 @@ ENTRY(__switch_to) __switch_back: and ~EPSW_NMID,epsw ret [d2,d3,a2,a3,exreg1],32 + +#ifdef CONFIG_KGDB +############################################################################### +# +# Lift the single-step breakpoints when the task being traced is switched out +# A0 = prev +# A1 = next +# +############################################################################### +__switch_to__lift_sstep_bp: + add -12,sp + mov a0,e4 + mov a1,e5 + + # Clear the single-step flag to prevent us coming this way until we get + # switched back in + bclr 0xff,(kgdb_single_step) + + # Remove first breakpoint + mov (kgdb_sstep_bp_addr),a2 + cmp 0,a2 + beq 1f + movbu (kgdb_sstep_bp),d0 + movbu d0,(a2) +#if defined(CONFIG_MN10300_CACHE_FLUSH_ICACHE) || defined(CONFIG_MN10300_CACHE_INV_ICACHE) + mov a2,d0 + mov a2,d1 + add 1,d1 + calls flush_icache_range +#endif +1: + + # Remove second breakpoint + mov (kgdb_sstep_bp_addr+4),a2 + cmp 0,a2 + beq 2f + movbu (kgdb_sstep_bp+1),d0 + movbu d0,(a2) +#if defined(CONFIG_MN10300_CACHE_FLUSH_ICACHE) || defined(CONFIG_MN10300_CACHE_INV_ICACHE) + mov a2,d0 + mov a2,d1 + add 1,d1 + calls flush_icache_range +#endif +2: + + # Change the resumption address and return + mov __switch_back__reinstall_sstep_bp,d0 + mov e4,a0 + mov e5,a1 + add 12,sp + bra __switch_to__continue + +############################################################################### +# +# Reinstall the single-step breakpoints when the task being traced is switched +# back in (A1 points to the new thread_struct). +# +############################################################################### +__switch_back__reinstall_sstep_bp: + add -12,sp + mov a0,e4 # save the return value + mov 0xff,d3 + + # Reinstall first breakpoint + mov (kgdb_sstep_bp_addr),a2 + cmp 0,a2 + beq 1f + movbu (a2),d0 + movbu d0,(kgdb_sstep_bp) + movbu d3,(a2) +#if defined(CONFIG_MN10300_CACHE_FLUSH_ICACHE) || defined(CONFIG_MN10300_CACHE_INV_ICACHE) + mov a2,d0 + mov a2,d1 + add 1,d1 + calls flush_icache_range +#endif +1: + + # Reinstall second breakpoint + mov (kgdb_sstep_bp_addr+4),a2 + cmp 0,a2 + beq 2f + movbu (a2),d0 + movbu d0,(kgdb_sstep_bp+1) + movbu d3,(a2) +#if defined(CONFIG_MN10300_CACHE_FLUSH_ICACHE) || defined(CONFIG_MN10300_CACHE_INV_ICACHE) + mov a2,d0 + mov a2,d1 + add 1,d1 + calls flush_icache_range +#endif +2: + + mov d3,(kgdb_single_step) + + # Restore the return value (the previous thread_struct pointer) + mov e4,a0 + mov a0,d0 + add 12,sp + bra __switch_back + +#endif /* CONFIG_KGDB */ diff --git a/arch/mn10300/kernel/traps.c b/arch/mn10300/kernel/traps.c index b90c3f160c77..f03cb278828f 100644 --- a/arch/mn10300/kernel/traps.c +++ b/arch/mn10300/kernel/traps.c @@ -38,8 +38,9 @@ #include <asm/busctl-regs.h> #include <unit/leds.h> #include <asm/fpu.h> -#include <asm/gdb-stub.h> #include <asm/sections.h> +#include <asm/debugger.h> +#include "internal.h" #if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff) #error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!" @@ -49,63 +50,169 @@ int kstack_depth_to_print = 24; spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock); -ATOMIC_NOTIFIER_HEAD(mn10300_die_chain); +struct exception_to_signal_map { + u8 signo; + u32 si_code; +}; + +static const struct exception_to_signal_map exception_to_signal_map[256] = { + /* MMU exceptions */ + [EXCEP_ITLBMISS >> 3] = { 0, 0 }, + [EXCEP_DTLBMISS >> 3] = { 0, 0 }, + [EXCEP_IAERROR >> 3] = { 0, 0 }, + [EXCEP_DAERROR >> 3] = { 0, 0 }, + + /* system exceptions */ + [EXCEP_TRAP >> 3] = { SIGTRAP, TRAP_BRKPT }, + [EXCEP_ISTEP >> 3] = { SIGTRAP, TRAP_TRACE }, /* Monitor */ + [EXCEP_IBREAK >> 3] = { SIGTRAP, TRAP_HWBKPT }, /* Monitor */ + [EXCEP_OBREAK >> 3] = { SIGTRAP, TRAP_HWBKPT }, /* Monitor */ + [EXCEP_PRIVINS >> 3] = { SIGILL, ILL_PRVOPC }, + [EXCEP_UNIMPINS >> 3] = { SIGILL, ILL_ILLOPC }, + [EXCEP_UNIMPEXINS >> 3] = { SIGILL, ILL_ILLOPC }, + [EXCEP_MEMERR >> 3] = { SIGSEGV, SEGV_ACCERR }, + [EXCEP_MISALIGN >> 3] = { SIGBUS, BUS_ADRALN }, + [EXCEP_BUSERROR >> 3] = { SIGBUS, BUS_ADRERR }, + [EXCEP_ILLINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, + [EXCEP_ILLDATACC >> 3] = { SIGSEGV, SEGV_ACCERR }, + [EXCEP_IOINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, + [EXCEP_PRIVINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, /* userspace */ + [EXCEP_PRIVDATACC >> 3] = { SIGSEGV, SEGV_ACCERR }, /* userspace */ + [EXCEP_DATINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, + [EXCEP_DOUBLE_FAULT >> 3] = { SIGILL, ILL_BADSTK }, + + /* FPU exceptions */ + [EXCEP_FPU_DISABLED >> 3] = { SIGILL, ILL_COPROC }, + [EXCEP_FPU_UNIMPINS >> 3] = { SIGILL, ILL_COPROC }, + [EXCEP_FPU_OPERATION >> 3] = { SIGFPE, FPE_INTDIV }, + + /* interrupts */ + [EXCEP_WDT >> 3] = { SIGALRM, 0 }, + [EXCEP_NMI >> 3] = { SIGQUIT, 0 }, + [EXCEP_IRQ_LEVEL0 >> 3] = { SIGINT, 0 }, + [EXCEP_IRQ_LEVEL1 >> 3] = { 0, 0 }, + [EXCEP_IRQ_LEVEL2 >> 3] = { 0, 0 }, + [EXCEP_IRQ_LEVEL3 >> 3] = { 0, 0 }, + [EXCEP_IRQ_LEVEL4 >> 3] = { 0, 0 }, + [EXCEP_IRQ_LEVEL5 >> 3] = { 0, 0 }, + [EXCEP_IRQ_LEVEL6 >> 3] = { 0, 0 }, + + /* system calls */ + [EXCEP_SYSCALL0 >> 3] = { 0, 0 }, + [EXCEP_SYSCALL1 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL2 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL3 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL4 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL5 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL6 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL7 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL8 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL9 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL10 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL11 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL12 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL13 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL14 >> 3] = { SIGILL, ILL_ILLTRP }, + [EXCEP_SYSCALL15 >> 3] = { SIGABRT, 0 }, +}; /* - * These constants are for searching for possible module text - * segments. MODULE_RANGE is a guess of how much space is likely - * to be vmalloced. + * Handle kernel exceptions. + * + * See if there's a fixup handler we can force a jump to when an exception + * happens due to something kernel code did */ -#define MODULE_RANGE (8 * 1024 * 1024) - -#define DO_ERROR(signr, prologue, str, name) \ -asmlinkage void name(struct pt_regs *regs, u32 intcode) \ -{ \ - prologue; \ - if (die_if_no_fixup(str, regs, intcode)) \ - return; \ - force_sig(signr, current); \ -} +int die_if_no_fixup(const char *str, struct pt_regs *regs, + enum exception_code code) +{ + u8 opcode; + int signo, si_code; + + if (user_mode(regs)) + return 0; + + peripheral_leds_display_exception(code); + + signo = exception_to_signal_map[code >> 3].signo; + si_code = exception_to_signal_map[code >> 3].si_code; + + switch (code) { + /* see if we can fixup the kernel accessing memory */ + case EXCEP_ITLBMISS: + case EXCEP_DTLBMISS: + case EXCEP_IAERROR: + case EXCEP_DAERROR: + case EXCEP_MEMERR: + case EXCEP_MISALIGN: + case EXCEP_BUSERROR: + case EXCEP_ILLDATACC: + case EXCEP_IOINSACC: + case EXCEP_PRIVINSACC: + case EXCEP_PRIVDATACC: + case EXCEP_DATINSACC: + if (fixup_exception(regs)) + return 1; + break; -#define DO_EINFO(signr, prologue, str, name, sicode) \ -asmlinkage void name(struct pt_regs *regs, u32 intcode) \ -{ \ - siginfo_t info; \ - prologue; \ - if (die_if_no_fixup(str, regs, intcode)) \ - return; \ - info.si_signo = signr; \ - if (signr == SIGILL && sicode == ILL_ILLOPC) { \ - uint8_t opcode; \ - if (get_user(opcode, (uint8_t __user *)regs->pc) == 0) \ - if (opcode == 0xff) \ - info.si_signo = SIGTRAP; \ - } \ - info.si_errno = 0; \ - info.si_code = sicode; \ - info.si_addr = (void *) regs->pc; \ - force_sig_info(info.si_signo, &info, current); \ + case EXCEP_TRAP: + case EXCEP_UNIMPINS: + if (get_user(opcode, (uint8_t __user *)regs->pc) != 0) + break; + if (opcode == 0xff) { + if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0)) + return 1; + if (at_debugger_breakpoint(regs)) + regs->pc++; + signo = SIGTRAP; + si_code = TRAP_BRKPT; + } + break; + + case EXCEP_SYSCALL1 ... EXCEP_SYSCALL14: + /* syscall return addr is _after_ the instruction */ + regs->pc -= 2; + break; + + case EXCEP_SYSCALL15: + if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_WARN) + return 1; + + /* syscall return addr is _after_ the instruction */ + regs->pc -= 2; + break; + + default: + break; + } + + if (debugger_intercept(code, signo, si_code, regs) == 0) + return 1; + + if (notify_die(DIE_GPF, str, regs, code, 0, 0)) + return 1; + + /* make the process die as the last resort */ + die(str, regs, code); } -DO_ERROR(SIGTRAP, {}, "trap", trap); -DO_ERROR(SIGSEGV, {}, "ibreak", ibreak); -DO_ERROR(SIGSEGV, {}, "obreak", obreak); -DO_EINFO(SIGSEGV, {}, "access error", access_error, SEGV_ACCERR); -DO_EINFO(SIGSEGV, {}, "insn access error", insn_acc_error, SEGV_ACCERR); -DO_EINFO(SIGSEGV, {}, "data access error", data_acc_error, SEGV_ACCERR); -DO_EINFO(SIGILL, {}, "privileged opcode", priv_op, ILL_PRVOPC); -DO_EINFO(SIGILL, {}, "invalid opcode", invalid_op, ILL_ILLOPC); -DO_EINFO(SIGILL, {}, "invalid ex opcode", invalid_exop, ILL_ILLOPC); -DO_EINFO(SIGBUS, {}, "invalid address", mem_error, BUS_ADRERR); -DO_EINFO(SIGBUS, {}, "bus error", bus_error, BUS_ADRERR); - -DO_ERROR(SIGTRAP, -#ifndef CONFIG_MN10300_USING_JTAG - DCR &= ~0x0001, -#else - {}, -#endif - "single step", istep); +/* + * General exception handler + */ +asmlinkage void handle_exception(struct pt_regs *regs, u32 intcode) +{ + siginfo_t info; + + /* deal with kernel exceptions here */ + if (die_if_no_fixup(NULL, regs, intcode)) + return; + + /* otherwise it's a userspace exception */ + info.si_signo = exception_to_signal_map[intcode >> 3].signo; + info.si_code = exception_to_signal_map[intcode >> 3].si_code; + info.si_errno = 0; + info.si_addr = (void *) regs->pc; + force_sig_info(info.si_signo, &info, current); +} /* * handle NMI @@ -113,10 +220,8 @@ DO_ERROR(SIGTRAP, asmlinkage void nmi(struct pt_regs *regs, enum exception_code code) { /* see if gdbstub wants to deal with it */ -#ifdef CONFIG_GDBSTUB - if (gdbstub_intercept(regs, code)) + if (debugger_intercept(code, SIGQUIT, 0, regs)) return; -#endif printk(KERN_WARNING "--- Register Dump ---\n"); show_registers(regs); @@ -128,29 +233,36 @@ asmlinkage void nmi(struct pt_regs *regs, enum exception_code code) */ void show_trace(unsigned long *sp) { - unsigned long *stack, addr, module_start, module_end; - int i; - - printk(KERN_EMERG "\nCall Trace:"); - - stack = sp; - i = 0; - module_start = VMALLOC_START; - module_end = VMALLOC_END; + unsigned long bottom, stack, addr, fp, raslot; + + printk(KERN_EMERG "\nCall Trace:\n"); + + //stack = (unsigned long)sp; + asm("mov sp,%0" : "=a"(stack)); + asm("mov a3,%0" : "=r"(fp)); + + raslot = ULONG_MAX; + bottom = (stack + THREAD_SIZE) & ~(THREAD_SIZE - 1); + for (; stack < bottom; stack += sizeof(addr)) { + addr = *(unsigned long *)stack; + if (stack == fp) { + if (addr > stack && addr < bottom) { + fp = addr; + raslot = stack + sizeof(addr); + continue; + } + fp = 0; + raslot = ULONG_MAX; + } - while (((long) stack & (THREAD_SIZE - 1)) != 0) { - addr = *stack++; if (__kernel_text_address(addr)) { -#if 1 printk(" [<%08lx>]", addr); + if (stack >= raslot) + raslot = ULONG_MAX; + else + printk(" ?"); print_symbol(" %s", addr); printk("\n"); -#else - if ((i % 6) == 0) - printk(KERN_EMERG " "); - printk("[<%08lx>] ", addr); - i++; -#endif } } @@ -323,86 +435,6 @@ void die(const char *str, struct pt_regs *regs, enum exception_code code) } /* - * see if there's a fixup handler we can force a jump to when an exception - * happens due to something kernel code did - */ -int die_if_no_fixup(const char *str, struct pt_regs *regs, - enum exception_code code) -{ - if (user_mode(regs)) - return 0; - - peripheral_leds_display_exception(code); - - switch (code) { - /* see if we can fixup the kernel accessing memory */ - case EXCEP_ITLBMISS: - case EXCEP_DTLBMISS: - case EXCEP_IAERROR: - case EXCEP_DAERROR: - case EXCEP_MEMERR: - case EXCEP_MISALIGN: - case EXCEP_BUSERROR: - case EXCEP_ILLDATACC: - case EXCEP_IOINSACC: - case EXCEP_PRIVINSACC: - case EXCEP_PRIVDATACC: - case EXCEP_DATINSACC: - if (fixup_exception(regs)) - return 1; - case EXCEP_UNIMPINS: - if (regs->pc && *(uint8_t *)regs->pc == 0xff) - if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0)) - return 1; - break; - default: - break; - } - - /* see if gdbstub wants to deal with it */ -#ifdef CONFIG_GDBSTUB - if (gdbstub_intercept(regs, code)) - return 1; -#endif - - if (notify_die(DIE_GPF, str, regs, code, 0, 0)) - return 1; - - /* make the process die as the last resort */ - die(str, regs, code); -} - -/* - * handle unsupported syscall instructions (syscall 1-15) - */ -static asmlinkage void unsupported_syscall(struct pt_regs *regs, - enum exception_code code) -{ - struct task_struct *tsk = current; - siginfo_t info; - - /* catch a kernel BUG() */ - if (code == EXCEP_SYSCALL15 && !user_mode(regs)) { - if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_BUG) { -#ifdef CONFIG_GDBSTUB - gdbstub_intercept(regs, code); -#endif - } - } - - regs->pc -= 2; /* syscall return addr is _after_ the instruction */ - - die_if_no_fixup("An unsupported syscall insn was used by the kernel\n", - regs, code); - - info.si_signo = SIGILL; - info.si_errno = ENOSYS; - info.si_code = ILL_ILLTRP; - info.si_addr = (void *) regs->pc; - force_sig_info(SIGILL, &info, tsk); -} - -/* * display the register file when the stack pointer gets clobbered */ asmlinkage void do_double_fault(struct pt_regs *regs) @@ -481,10 +513,8 @@ asmlinkage void uninitialised_exception(struct pt_regs *regs, { /* see if gdbstub wants to deal with it */ -#ifdef CONFIG_GDBSTUB - if (gdbstub_intercept(regs, code)) + if (debugger_intercept(code, SIGSYS, 0, regs) == 0) return; -#endif peripheral_leds_display_exception(code); printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF); @@ -549,43 +579,43 @@ void __init set_intr_stub(enum exception_code code, void *handler) */ void __init trap_init(void) { - set_excp_vector(EXCEP_TRAP, trap); - set_excp_vector(EXCEP_ISTEP, istep); - set_excp_vector(EXCEP_IBREAK, ibreak); - set_excp_vector(EXCEP_OBREAK, obreak); - - set_excp_vector(EXCEP_PRIVINS, priv_op); - set_excp_vector(EXCEP_UNIMPINS, invalid_op); - set_excp_vector(EXCEP_UNIMPEXINS, invalid_exop); - set_excp_vector(EXCEP_MEMERR, mem_error); + set_excp_vector(EXCEP_TRAP, handle_exception); + set_excp_vector(EXCEP_ISTEP, handle_exception); + set_excp_vector(EXCEP_IBREAK, handle_exception); + set_excp_vector(EXCEP_OBREAK, handle_exception); + + set_excp_vector(EXCEP_PRIVINS, handle_exception); + set_excp_vector(EXCEP_UNIMPINS, handle_exception); + set_excp_vector(EXCEP_UNIMPEXINS, handle_exception); + set_excp_vector(EXCEP_MEMERR, handle_exception); set_excp_vector(EXCEP_MISALIGN, misalignment); - set_excp_vector(EXCEP_BUSERROR, bus_error); - set_excp_vector(EXCEP_ILLINSACC, insn_acc_error); - set_excp_vector(EXCEP_ILLDATACC, data_acc_error); - set_excp_vector(EXCEP_IOINSACC, insn_acc_error); - set_excp_vector(EXCEP_PRIVINSACC, insn_acc_error); - set_excp_vector(EXCEP_PRIVDATACC, data_acc_error); - set_excp_vector(EXCEP_DATINSACC, insn_acc_error); - set_excp_vector(EXCEP_FPU_UNIMPINS, fpu_invalid_op); + set_excp_vector(EXCEP_BUSERROR, handle_exception); + set_excp_vector(EXCEP_ILLINSACC, handle_exception); + set_excp_vector(EXCEP_ILLDATACC, handle_exception); + set_excp_vector(EXCEP_IOINSACC, handle_exception); + set_excp_vector(EXCEP_PRIVINSACC, handle_exception); + set_excp_vector(EXCEP_PRIVDATACC, handle_exception); + set_excp_vector(EXCEP_DATINSACC, handle_exception); + set_excp_vector(EXCEP_FPU_UNIMPINS, handle_exception); set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception); set_excp_vector(EXCEP_NMI, nmi); - set_excp_vector(EXCEP_SYSCALL1, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL2, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL3, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL4, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL5, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL6, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL7, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL8, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL9, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL10, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL11, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL12, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL13, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL14, unsupported_syscall); - set_excp_vector(EXCEP_SYSCALL15, unsupported_syscall); + set_excp_vector(EXCEP_SYSCALL1, handle_exception); + set_excp_vector(EXCEP_SYSCALL2, handle_exception); + set_excp_vector(EXCEP_SYSCALL3, handle_exception); + set_excp_vector(EXCEP_SYSCALL4, handle_exception); + set_excp_vector(EXCEP_SYSCALL5, handle_exception); + set_excp_vector(EXCEP_SYSCALL6, handle_exception); + set_excp_vector(EXCEP_SYSCALL7, handle_exception); + set_excp_vector(EXCEP_SYSCALL8, handle_exception); + set_excp_vector(EXCEP_SYSCALL9, handle_exception); + set_excp_vector(EXCEP_SYSCALL10, handle_exception); + set_excp_vector(EXCEP_SYSCALL11, handle_exception); + set_excp_vector(EXCEP_SYSCALL12, handle_exception); + set_excp_vector(EXCEP_SYSCALL13, handle_exception); + set_excp_vector(EXCEP_SYSCALL14, handle_exception); + set_excp_vector(EXCEP_SYSCALL15, handle_exception); } /* diff --git a/arch/mn10300/mm/Kconfig.cache b/arch/mn10300/mm/Kconfig.cache index c4fd923a55a0..bfbe52691f2c 100644 --- a/arch/mn10300/mm/Kconfig.cache +++ b/arch/mn10300/mm/Kconfig.cache @@ -99,3 +99,49 @@ config MN10300_CACHE_INV_ICACHE help Set if we need the icache to be invalidated, even if the dcache is in write-through mode and doesn't need flushing. + +# +# The kernel debugger gets its own separate cache flushing functions +# +config MN10300_DEBUGGER_CACHE_FLUSH_BY_TAG + def_bool y if KERNEL_DEBUGGER && \ + MN10300_CACHE_WBACK && \ + !MN10300_CACHE_SNOOP && \ + MN10300_CACHE_MANAGE_BY_TAG + help + Set if the debugger needs to flush the dcache and invalidate the + icache using the cache tag registers to make breakpoints work. + +config MN10300_DEBUGGER_CACHE_FLUSH_BY_REG + def_bool y if KERNEL_DEBUGGER && \ + MN10300_CACHE_WBACK && \ + !MN10300_CACHE_SNOOP && \ + MN10300_CACHE_MANAGE_BY_REG + help + Set if the debugger needs to flush the dcache and invalidate the + icache using automatic purge registers to make breakpoints work. + +config MN10300_DEBUGGER_CACHE_INV_BY_TAG + def_bool y if KERNEL_DEBUGGER && \ + MN10300_CACHE_WTHRU && \ + !MN10300_CACHE_SNOOP && \ + MN10300_CACHE_MANAGE_BY_TAG + help + Set if the debugger needs to invalidate the icache using the cache + tag registers to make breakpoints work. + +config MN10300_DEBUGGER_CACHE_INV_BY_REG + def_bool y if KERNEL_DEBUGGER && \ + MN10300_CACHE_WTHRU && \ + !MN10300_CACHE_SNOOP && \ + MN10300_CACHE_MANAGE_BY_REG + help + Set if the debugger needs to invalidate the icache using automatic + purge registers to make breakpoints work. + +config MN10300_DEBUGGER_CACHE_NO_FLUSH + def_bool y if KERNEL_DEBUGGER && \ + (MN10300_CACHE_DISABLED || MN10300_CACHE_SNOOP) + help + Set if the debugger does not need to flush the dcache and/or + invalidate the icache to make breakpoints work. diff --git a/arch/mn10300/mm/Makefile b/arch/mn10300/mm/Makefile index 203fee23f7d7..11f38466ac28 100644 --- a/arch/mn10300/mm/Makefile +++ b/arch/mn10300/mm/Makefile @@ -13,6 +13,15 @@ cacheflush-$(CONFIG_MN10300_CACHE_INV_BY_REG) += cache-inv-by-reg.o cacheflush-$(CONFIG_MN10300_CACHE_FLUSH_BY_TAG) += cache-flush-by-tag.o cacheflush-$(CONFIG_MN10300_CACHE_FLUSH_BY_REG) += cache-flush-by-reg.o +cacheflush-$(CONFIG_MN10300_DEBUGGER_CACHE_FLUSH_BY_TAG) += \ + cache-dbg-flush-by-tag.o cache-dbg-inv-by-tag.o +cacheflush-$(CONFIG_MN10300_DEBUGGER_CACHE_FLUSH_BY_REG) += \ + cache-dbg-flush-by-reg.o +cacheflush-$(CONFIG_MN10300_DEBUGGER_CACHE_INV_BY_TAG) += \ + cache-dbg-inv-by-tag.o cache-dbg-inv.o +cacheflush-$(CONFIG_MN10300_DEBUGGER_CACHE_INV_BY_REG) += \ + cache-dbg-inv-by-reg.o cache-dbg-inv.o + cacheflush-$(CONFIG_MN10300_CACHE_DISABLED) := cache-disabled.o obj-y := \ diff --git a/arch/mn10300/mm/cache-dbg-flush-by-reg.S b/arch/mn10300/mm/cache-dbg-flush-by-reg.S new file mode 100644 index 000000000000..665919f2ab62 --- /dev/null +++ b/arch/mn10300/mm/cache-dbg-flush-by-reg.S @@ -0,0 +1,160 @@ +/* MN10300 CPU cache invalidation routines, using automatic purge registers + * + * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#include <linux/sys.h> +#include <linux/linkage.h> +#include <asm/smp.h> +#include <asm/page.h> +#include <asm/cache.h> +#include <asm/irqflags.h> +#include <asm/cacheflush.h> +#include "cache.inc" + + .am33_2 + +############################################################################### +# +# void debugger_local_cache_flushinv(void) +# Flush the entire data cache back to RAM and invalidate the icache +# +############################################################################### + ALIGN + .globl debugger_local_cache_flushinv + .type debugger_local_cache_flushinv,@function +debugger_local_cache_flushinv: + # + # firstly flush the dcache + # + movhu (CHCTR),d0 + btst CHCTR_DCEN|CHCTR_ICEN,d0 + beq debugger_local_cache_flushinv_end + + mov DCPGCR,a0 + + mov epsw,d1 + and ~EPSW_IE,epsw + or EPSW_NMID,epsw + nop + + btst CHCTR_DCEN,d0 + beq debugger_local_cache_flushinv_no_dcache + + # wait for busy bit of area purge + setlb + mov (a0),d0 + btst DCPGCR_DCPGBSY,d0 + lne + + # set mask + clr d0 + mov d0,(DCPGMR) + + # area purge + # + # DCPGCR = DCPGCR_DCP + # + mov DCPGCR_DCP,d0 + mov d0,(a0) + + # wait for busy bit of area purge + setlb + mov (a0),d0 + btst DCPGCR_DCPGBSY,d0 + lne + +debugger_local_cache_flushinv_no_dcache: + # + # secondly, invalidate the icache if it is enabled + # + mov CHCTR,a0 + movhu (a0),d0 + btst CHCTR_ICEN,d0 + beq debugger_local_cache_flushinv_done + + invalidate_icache 0 + +debugger_local_cache_flushinv_done: + mov d1,epsw + +debugger_local_cache_flushinv_end: + ret [],0 + .size debugger_local_cache_flushinv,.-debugger_local_cache_flushinv + +############################################################################### +# +# void debugger_local_cache_flushinv_one(u8 *addr) +# +# Invalidate one particular cacheline if it's in the icache +# +############################################################################### + ALIGN + .globl debugger_local_cache_flushinv_one + .type debugger_local_cache_flushinv_one,@function +debugger_local_cache_flushinv_one: + movhu (CHCTR),d1 + btst CHCTR_DCEN|CHCTR_ICEN,d1 + beq debugger_local_cache_flushinv_one_end + btst CHCTR_DCEN,d1 + beq debugger_local_cache_flushinv_one_no_dcache + + # round cacheline addr down + and L1_CACHE_TAG_MASK,d0 + mov d0,a1 + mov d0,d1 + + # determine the dcache purge control reg address + mov DCACHE_PURGE(0,0),a0 + and L1_CACHE_TAG_ENTRY,d0 + add d0,a0 + + # retain valid entries in the cache + or L1_CACHE_TAG_VALID,d1 + + # conditionally purge this line in all ways + mov d1,(L1_CACHE_WAYDISP*0,a0) + +debugger_local_cache_flushinv_no_dcache: + # + # now try to flush the icache + # + mov CHCTR,a0 + movhu (a0),d0 + btst CHCTR_ICEN,d0 + beq mn10300_local_icache_inv_range_reg_end + + LOCAL_CLI_SAVE(d1) + + mov ICIVCR,a0 + + # wait for the invalidator to quiesce + setlb + mov (a0),d0 + btst ICIVCR_ICIVBSY,d0 + lne + + # set the mask + mov L1_CACHE_TAG_MASK,d0 + mov d0,(ICIVMR) + + # invalidate the cache line at the given address + or ICIVCR_ICI,a1 + mov a1,(a0) + + # wait for the invalidator to quiesce again + setlb + mov (a0),d0 + btst ICIVCR_ICIVBSY,d0 + lne + + LOCAL_IRQ_RESTORE(d1) + +debugger_local_cache_flushinv_one_end: + ret [],0 + .size debugger_local_cache_flushinv_one,.-debugger_local_cache_flushinv_one diff --git a/arch/mn10300/mm/cache-dbg-flush-by-tag.S b/arch/mn10300/mm/cache-dbg-flush-by-tag.S new file mode 100644 index 000000000000..bf56930e6e70 --- /dev/null +++ b/arch/mn10300/mm/cache-dbg-flush-by-tag.S @@ -0,0 +1,114 @@ +/* MN10300 CPU cache invalidation routines, using direct tag flushing + * + * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#include <linux/sys.h> +#include <linux/linkage.h> +#include <asm/smp.h> +#include <asm/page.h> +#include <asm/cache.h> +#include <asm/irqflags.h> +#include <asm/cacheflush.h> +#include "cache.inc" + + .am33_2 + +############################################################################### +# +# void debugger_local_cache_flushinv(void) +# +# Flush the entire data cache back to RAM and invalidate the icache +# +############################################################################### + ALIGN + .globl debugger_local_cache_flushinv + .type debugger_local_cache_flushinv,@function +debugger_local_cache_flushinv: + # + # firstly flush the dcache + # + movhu (CHCTR),d0 + btst CHCTR_DCEN|CHCTR_ICEN,d0 + beq debugger_local_cache_flushinv_end + + btst CHCTR_DCEN,d0 + beq debugger_local_cache_flushinv_no_dcache + + # read the addresses tagged in the cache's tag RAM and attempt to flush + # those addresses specifically + # - we rely on the hardware to filter out invalid tag entry addresses + mov DCACHE_TAG(0,0),a0 # dcache tag RAM access address + mov DCACHE_PURGE(0,0),a1 # dcache purge request address + mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,e0 # total number of entries + +mn10300_local_dcache_flush_loop: + mov (a0),d0 + and L1_CACHE_TAG_MASK,d0 + or L1_CACHE_TAG_VALID,d0 # retain valid entries in the + # cache + mov d0,(a1) # conditional purge + + add L1_CACHE_BYTES,a0 + add L1_CACHE_BYTES,a1 + add -1,e0 + bne mn10300_local_dcache_flush_loop + +debugger_local_cache_flushinv_no_dcache: + # + # secondly, invalidate the icache if it is enabled + # + mov CHCTR,a0 + movhu (a0),d0 + btst CHCTR_ICEN,d0 + beq debugger_local_cache_flushinv_end + + invalidate_icache 1 + +debugger_local_cache_flushinv_end: + ret [],0 + .size debugger_local_cache_flushinv,.-debugger_local_cache_flushinv + +############################################################################### +# +# void debugger_local_cache_flushinv_one(u8 *addr) +# +# Invalidate one particular cacheline if it's in the icache +# +############################################################################### + ALIGN + .globl debugger_local_cache_flushinv_one + .type debugger_local_cache_flushinv_one,@function +debugger_local_cache_flushinv_one: + movhu (CHCTR),d1 + btst CHCTR_DCEN|CHCTR_ICEN,d1 + beq debugger_local_cache_flushinv_one_end + btst CHCTR_DCEN,d1 + beq debugger_local_cache_flushinv_one_icache + + # round cacheline addr down + and L1_CACHE_TAG_MASK,d0 + mov d0,a1 + + # determine the dcache purge control reg address + mov DCACHE_PURGE(0,0),a0 + and L1_CACHE_TAG_ENTRY,d0 + add d0,a0 + + # retain valid entries in the cache + or L1_CACHE_TAG_VALID,a1 + + # conditionally purge this line in all ways + mov a1,(L1_CACHE_WAYDISP*0,a0) + + # now go and do the icache + bra debugger_local_cache_flushinv_one_icache + +debugger_local_cache_flushinv_one_end: + ret [],0 + .size debugger_local_cache_flushinv_one,.-debugger_local_cache_flushinv_one diff --git a/arch/mn10300/mm/cache-dbg-inv-by-reg.S b/arch/mn10300/mm/cache-dbg-inv-by-reg.S new file mode 100644 index 000000000000..c4e6252941b1 --- /dev/null +++ b/arch/mn10300/mm/cache-dbg-inv-by-reg.S @@ -0,0 +1,69 @@ +/* MN10300 CPU cache invalidation routines, using automatic purge registers + * + * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#include <linux/sys.h> +#include <linux/linkage.h> +#include <asm/cache.h> +#include <asm/irqflags.h> +#include <asm/cacheflush.h> +#include "cache.inc" + + .am33_2 + + .globl debugger_local_cache_flushinv_one + +############################################################################### +# +# void debugger_local_cache_flushinv_one(u8 *addr) +# +# Invalidate one particular cacheline if it's in the icache +# +############################################################################### + ALIGN + .globl debugger_local_cache_flushinv_one + .type debugger_local_cache_flushinv_one,@function +debugger_local_cache_flushinv_one: + mov d0,a1 + + mov CHCTR,a0 + movhu (a0),d0 + btst CHCTR_ICEN,d0 + beq mn10300_local_icache_inv_range_reg_end + + LOCAL_CLI_SAVE(d1) + + mov ICIVCR,a0 + + # wait for the invalidator to quiesce + setlb + mov (a0),d0 + btst ICIVCR_ICIVBSY,d0 + lne + + # set the mask + mov ~L1_CACHE_TAG_MASK,d0 + mov d0,(ICIVMR) + + # invalidate the cache line at the given address + and ~L1_CACHE_TAG_MASK,a1 + or ICIVCR_ICI,a1 + mov a1,(a0) + + # wait for the invalidator to quiesce again + setlb + mov (a0),d0 + btst ICIVCR_ICIVBSY,d0 + lne + + LOCAL_IRQ_RESTORE(d1) + +mn10300_local_icache_inv_range_reg_end: + ret [],0 + .size debugger_local_cache_flushinv_one,.-debugger_local_cache_flushinv_one diff --git a/arch/mn10300/mm/cache-dbg-inv-by-tag.S b/arch/mn10300/mm/cache-dbg-inv-by-tag.S new file mode 100644 index 000000000000..d8ec821e5f88 --- /dev/null +++ b/arch/mn10300/mm/cache-dbg-inv-by-tag.S @@ -0,0 +1,120 @@ +/* MN10300 CPU cache invalidation routines, using direct tag flushing + * + * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#include <linux/sys.h> +#include <linux/linkage.h> +#include <asm/smp.h> +#include <asm/page.h> +#include <asm/cache.h> +#include <asm/irqflags.h> +#include <asm/cacheflush.h> +#include "cache.inc" + + .am33_2 + + .globl debugger_local_cache_flushinv_one_icache + +############################################################################### +# +# void debugger_local_cache_flushinv_one(u8 *addr) +# +# Invalidate one particular cacheline if it's in the icache +# +############################################################################### + ALIGN + .globl debugger_local_cache_flushinv_one_icache + .type debugger_local_cache_flushinv_one_icache,@function +debugger_local_cache_flushinv_one_icache: + movm [d3,a2],(sp) + + mov CHCTR,a2 + movhu (a2),d0 + btst CHCTR_ICEN,d0 + beq debugger_local_cache_flushinv_one_icache_end + + mov d0,a1 + and L1_CACHE_TAG_MASK,a1 + + # read the tags from the tag RAM, and if they indicate a matching valid + # cache line then we invalidate that line + mov ICACHE_TAG(0,0),a0 + mov a1,d0 + and L1_CACHE_TAG_ENTRY,d0 + add d0,a0 # starting icache tag RAM + # access address + + and ~(L1_CACHE_DISPARITY-1),a1 # determine comparator base + or L1_CACHE_TAG_VALID,a1 + mov L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_VALID,d1 + + LOCAL_CLI_SAVE(d3) + + # disable the icache + movhu (a2),d0 + and ~CHCTR_ICEN,d0 + movhu d0,(a2) + + # and wait for it to calm down + setlb + movhu (a2),d0 + btst CHCTR_ICBUSY,d0 + lne + + # check all the way tags for this cache entry + mov (a0),d0 # read the tag in the way 0 slot + xor a1,d0 + and d1,d0 + beq debugger_local_icache_kill # jump if matched + + add L1_CACHE_WAYDISP,a0 + mov (a0),d0 # read the tag in the way 1 slot + xor a1,d0 + and d1,d0 + beq debugger_local_icache_kill # jump if matched + + add L1_CACHE_WAYDISP,a0 + mov (a0),d0 # read the tag in the way 2 slot + xor a1,d0 + and d1,d0 + beq debugger_local_icache_kill # jump if matched + + add L1_CACHE_WAYDISP,a0 + mov (a0),d0 # read the tag in the way 3 slot + xor a1,d0 + and d1,d0 + bne debugger_local_icache_finish # jump if not matched + +debugger_local_icache_kill: + mov d0,(a0) # kill the tag (D0 is 0 at this point) + +debugger_local_icache_finish: + # wait for the cache to finish what it's doing + setlb + movhu (a2),d0 + btst CHCTR_ICBUSY,d0 + lne + + # and reenable it + or CHCTR_ICEN,d0 + movhu d0,(a2) + movhu (a2),d0 + + # re-enable interrupts + LOCAL_IRQ_RESTORE(d3) + +debugger_local_cache_flushinv_one_icache_end: + ret [d3,a2],8 + .size debugger_local_cache_flushinv_one_icache,.-debugger_local_cache_flushinv_one_icache + +#ifdef CONFIG_MN10300_DEBUGGER_CACHE_INV_BY_TAG + .globl debugger_local_cache_flushinv_one + .type debugger_local_cache_flushinv_one,@function +debugger_local_cache_flushinv_one = debugger_local_cache_flushinv_one_icache +#endif diff --git a/arch/mn10300/mm/cache-dbg-inv.S b/arch/mn10300/mm/cache-dbg-inv.S new file mode 100644 index 000000000000..eba2d6dca066 --- /dev/null +++ b/arch/mn10300/mm/cache-dbg-inv.S @@ -0,0 +1,47 @@ +/* MN10300 CPU cache invalidation routines + * + * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#include <linux/sys.h> +#include <linux/linkage.h> +#include <asm/smp.h> +#include <asm/page.h> +#include <asm/cache.h> +#include <asm/irqflags.h> +#include <asm/cacheflush.h> +#include "cache.inc" + + .am33_2 + + .globl debugger_local_cache_flushinv + +############################################################################### +# +# void debugger_local_cache_flushinv(void) +# +# Invalidate the entire icache +# +############################################################################### + ALIGN + .globl debugger_local_cache_flushinv + .type debugger_local_cache_flushinv,@function +debugger_local_cache_flushinv: + # + # we only need to invalidate the icache in this cache mode + # + mov CHCTR,a0 + movhu (a0),d0 + btst CHCTR_ICEN,d0 + beq debugger_local_cache_flushinv_end + + invalidate_icache 1 + +debugger_local_cache_flushinv_end: + ret [],0 + .size debugger_local_cache_flushinv,.-debugger_local_cache_flushinv diff --git a/arch/mn10300/mm/cache-flush-by-tag.S b/arch/mn10300/mm/cache-flush-by-tag.S index 5cd6a27dd63e..1ddc06849242 100644 --- a/arch/mn10300/mm/cache-flush-by-tag.S +++ b/arch/mn10300/mm/cache-flush-by-tag.S @@ -62,7 +62,7 @@ mn10300_local_dcache_flush: mn10300_local_dcache_flush_loop: mov (a0),d0 - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0 + and L1_CACHE_TAG_MASK,d0 or L1_CACHE_TAG_VALID,d0 # retain valid entries in the # cache mov d0,(a1) # conditional purge @@ -112,11 +112,11 @@ mn10300_local_dcache_flush_range: 1: # round start addr down - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0 + and L1_CACHE_TAG_MASK,d0 mov d0,a1 add L1_CACHE_BYTES,d1 # round end addr up - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d1 + and L1_CACHE_TAG_MASK,d1 # write a request to flush all instances of an address from the cache mov DCACHE_PURGE(0,0),a0 @@ -215,12 +215,11 @@ mn10300_local_dcache_flush_inv_range: bra mn10300_local_dcache_flush_inv 1: - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0 # round start - # addr down + and L1_CACHE_TAG_MASK,d0 # round start addr down mov d0,a1 - add L1_CACHE_BYTES,d1 # round end addr up - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d1 + add L1_CACHE_BYTES,d1 # round end addr up + and L1_CACHE_TAG_MASK,d1 # write a request to flush and invalidate all instances of an address # from the cache diff --git a/arch/mn10300/mm/cache-inv-by-reg.S b/arch/mn10300/mm/cache-inv-by-reg.S index c8950861ed77..a60825b91e77 100644 --- a/arch/mn10300/mm/cache-inv-by-reg.S +++ b/arch/mn10300/mm/cache-inv-by-reg.S @@ -15,6 +15,7 @@ #include <asm/cache.h> #include <asm/irqflags.h> #include <asm/cacheflush.h> +#include "cache.inc" #define mn10300_local_dcache_inv_range_intr_interval \ +((1 << MN10300_DCACHE_INV_RANGE_INTR_LOG2_INTERVAL) - 1) @@ -62,10 +63,7 @@ mn10300_local_icache_inv: btst CHCTR_ICEN,d0 beq mn10300_local_icache_inv_end - # invalidate - or CHCTR_ICINV,d0 - movhu d0,(a0) - movhu (a0),d0 + invalidate_icache 1 mn10300_local_icache_inv_end: ret [],0 @@ -87,11 +85,8 @@ mn10300_local_dcache_inv: btst CHCTR_DCEN,d0 beq mn10300_local_dcache_inv_end - # invalidate - or CHCTR_DCINV,d0 - movhu d0,(a0) - movhu (a0),d0 - + invalidate_dcache 1 + mn10300_local_dcache_inv_end: ret [],0 .size mn10300_local_dcache_inv,.-mn10300_local_dcache_inv @@ -121,9 +116,9 @@ mn10300_local_dcache_inv_range: # and if they're not cacheline-aligned, we must flush any bits outside # the range that share cachelines with stuff inside the range #ifdef CONFIG_MN10300_CACHE_WBACK - btst ~(L1_CACHE_BYTES-1),d0 + btst ~L1_CACHE_TAG_MASK,d0 bne 1f - btst ~(L1_CACHE_BYTES-1),d1 + btst ~L1_CACHE_TAG_MASK,d1 beq 2f 1: bra mn10300_local_dcache_flush_inv_range @@ -141,12 +136,11 @@ mn10300_local_dcache_inv_range: # writeback mode, in which case we would be in flush and invalidate by # now #ifndef CONFIG_MN10300_CACHE_WBACK - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0 # round start - # addr down + and L1_CACHE_TAG_MASK,d0 # round start addr down mov L1_CACHE_BYTES-1,d2 add d2,d1 - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d1 # round end addr up + and L1_CACHE_TAG_MASK,d1 # round end addr up #endif /* !CONFIG_MN10300_CACHE_WBACK */ sub d0,d1,d2 # calculate the total size diff --git a/arch/mn10300/mm/cache-inv-by-tag.S b/arch/mn10300/mm/cache-inv-by-tag.S index e9713b40c0ff..ccedce9c144d 100644 --- a/arch/mn10300/mm/cache-inv-by-tag.S +++ b/arch/mn10300/mm/cache-inv-by-tag.S @@ -15,6 +15,7 @@ #include <asm/cache.h> #include <asm/irqflags.h> #include <asm/cacheflush.h> +#include "cache.inc" #define mn10300_local_dcache_inv_range_intr_interval \ +((1 << MN10300_DCACHE_INV_RANGE_INTR_LOG2_INTERVAL) - 1) @@ -70,43 +71,7 @@ mn10300_local_icache_inv: btst CHCTR_ICEN,d0 beq mn10300_local_icache_inv_end -#if defined(CONFIG_AM33_2) || defined(CONFIG_AM33_3) - LOCAL_CLI_SAVE(d1) - - # disable the icache - and ~CHCTR_ICEN,d0 - movhu d0,(a0) - - # and wait for it to calm down - setlb - movhu (a0),d0 - btst CHCTR_ICBUSY,d0 - lne - - # invalidate - or CHCTR_ICINV,d0 - movhu d0,(a0) - - # wait for the cache to finish - mov CHCTR,a0 - setlb - movhu (a0),d0 - btst CHCTR_ICBUSY,d0 - lne - - # and reenable it - and ~CHCTR_ICINV,d0 - or CHCTR_ICEN,d0 - movhu d0,(a0) - movhu (a0),d0 - - LOCAL_IRQ_RESTORE(d1) -#else /* CONFIG_AM33_2 || CONFIG_AM33_3 */ - # invalidate - or CHCTR_ICINV,d0 - movhu d0,(a0) - movhu (a0),d0 -#endif /* CONFIG_AM33_2 || CONFIG_AM33_3 */ + invalidate_icache 1 mn10300_local_icache_inv_end: ret [],0 @@ -128,43 +93,7 @@ mn10300_local_dcache_inv: btst CHCTR_DCEN,d0 beq mn10300_local_dcache_inv_end -#if defined(CONFIG_AM33_2) || defined(CONFIG_AM33_3) - LOCAL_CLI_SAVE(d1) - - # disable the dcache - and ~CHCTR_DCEN,d0 - movhu d0,(a0) - - # and wait for it to calm down - setlb - movhu (a0),d0 - btst CHCTR_DCBUSY,d0 - lne - - # invalidate - or CHCTR_DCINV,d0 - movhu d0,(a0) - - # wait for the cache to finish - mov CHCTR,a0 - setlb - movhu (a0),d0 - btst CHCTR_DCBUSY,d0 - lne - - # and reenable it - and ~CHCTR_DCINV,d0 - or CHCTR_DCEN,d0 - movhu d0,(a0) - movhu (a0),d0 - - LOCAL_IRQ_RESTORE(d1) -#else /* CONFIG_AM33_2 || CONFIG_AM33_3 */ - # invalidate - or CHCTR_DCINV,d0 - movhu d0,(a0) - movhu (a0),d0 -#endif /* CONFIG_AM33_2 || CONFIG_AM33_3 */ + invalidate_dcache 1 mn10300_local_dcache_inv_end: ret [],0 @@ -195,9 +124,9 @@ mn10300_local_dcache_inv_range: # and if they're not cacheline-aligned, we must flush any bits outside # the range that share cachelines with stuff inside the range #ifdef CONFIG_MN10300_CACHE_WBACK - btst ~(L1_CACHE_BYTES-1),d0 + btst ~L1_CACHE_TAG_MASK,d0 bne 1f - btst ~(L1_CACHE_BYTES-1),d1 + btst ~L1_CACHE_TAG_MASK,d1 beq 2f 1: bra mn10300_local_dcache_flush_inv_range @@ -212,11 +141,10 @@ mn10300_local_dcache_inv_range: beq mn10300_local_dcache_inv_range_end #ifndef CONFIG_MN10300_CACHE_WBACK - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0 # round start - # addr down + and L1_CACHE_TAG_MASK,d0 # round start addr down add L1_CACHE_BYTES,d1 # round end addr up - and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d1 + and L1_CACHE_TAG_MASK,d1 #endif /* !CONFIG_MN10300_CACHE_WBACK */ mov d0,a1 diff --git a/arch/mn10300/mm/cache.inc b/arch/mn10300/mm/cache.inc new file mode 100644 index 000000000000..394a119b9c73 --- /dev/null +++ b/arch/mn10300/mm/cache.inc @@ -0,0 +1,133 @@ +/* MN10300 CPU core caching macros -*- asm -*- + * + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ + + +############################################################################### +# +# Invalidate the instruction cache. +# A0: Should hold CHCTR +# D0: Should have been read from CHCTR +# D1: Will be clobbered +# +# On some cores it is necessary to disable the icache whilst we do this. +# +############################################################################### + .macro invalidate_icache,disable_irq + +#if defined(CONFIG_AM33_2) || defined(CONFIG_AM33_3) + .if \disable_irq + # don't want an interrupt routine seeing a disabled cache + mov epsw,d1 + and ~EPSW_IE,epsw + or EPSW_NMID,epsw + nop + nop + .endif + + # disable the icache + and ~CHCTR_ICEN,d0 + movhu d0,(a0) + + # and wait for it to calm down + setlb + movhu (a0),d0 + btst CHCTR_ICBUSY,d0 + lne + + # invalidate + or CHCTR_ICINV,d0 + movhu d0,(a0) + + # wait for the cache to finish + setlb + movhu (a0),d0 + btst CHCTR_ICBUSY,d0 + lne + + # and reenable it + or CHCTR_ICEN,d0 + movhu d0,(a0) + movhu (a0),d0 + + .if \disable_irq + LOCAL_IRQ_RESTORE(d1) + .endif + +#else /* CONFIG_AM33_2 || CONFIG_AM33_3 */ + + # invalidate + or CHCTR_ICINV,d0 + movhu d0,(a0) + movhu (a0),d0 + +#endif /* CONFIG_AM33_2 || CONFIG_AM33_3 */ + .endm + +############################################################################### +# +# Invalidate the data cache. +# A0: Should hold CHCTR +# D0: Should have been read from CHCTR +# D1: Will be clobbered +# +# On some cores it is necessary to disable the dcache whilst we do this. +# +############################################################################### + .macro invalidate_dcache,disable_irq + +#if defined(CONFIG_AM33_2) || defined(CONFIG_AM33_3) + .if \disable_irq + # don't want an interrupt routine seeing a disabled cache + mov epsw,d1 + and ~EPSW_IE,epsw + or EPSW_NMID,epsw + nop + nop + .endif + + # disable the dcache + and ~CHCTR_DCEN,d0 + movhu d0,(a0) + + # and wait for it to calm down + setlb + movhu (a0),d0 + btst CHCTR_DCBUSY,d0 + lne + + # invalidate + or CHCTR_DCINV,d0 + movhu d0,(a0) + + # wait for the cache to finish + setlb + movhu (a0),d0 + btst CHCTR_DCBUSY,d0 + lne + + # and reenable it + or CHCTR_DCEN,d0 + movhu d0,(a0) + movhu (a0),d0 + + .if \disable_irq + LOCAL_IRQ_RESTORE(d1) + .endif + +#else /* CONFIG_AM33_2 || CONFIG_AM33_3 */ + + # invalidate + or CHCTR_DCINV,d0 + movhu d0,(a0) + movhu (a0),d0 + +#endif /* CONFIG_AM33_2 || CONFIG_AM33_3 */ + .endm diff --git a/arch/mn10300/mm/fault.c b/arch/mn10300/mm/fault.c index 59c3da49d9d9..0945409a8022 100644 --- a/arch/mn10300/mm/fault.c +++ b/arch/mn10300/mm/fault.c @@ -28,8 +28,9 @@ #include <asm/uaccess.h> #include <asm/pgalloc.h> #include <asm/hardirq.h> -#include <asm/gdb-stub.h> #include <asm/cpu-regs.h> +#include <asm/debugger.h> +#include <asm/gdb-stub.h> /* * Unlock any spinlocks which will prevent us from getting the @@ -306,10 +307,8 @@ no_context: printk(" printing pc:\n"); printk(KERN_ALERT "%08lx\n", regs->pc); -#ifdef CONFIG_GDBSTUB - gdbstub_intercept( - regs, fault_code & 0x00010000 ? EXCEP_IAERROR : EXCEP_DAERROR); -#endif + debugger_intercept(fault_code & 0x00010000 ? EXCEP_IAERROR : EXCEP_DAERROR, + SIGSEGV, SEGV_ACCERR, regs); page = PTBR; page = ((unsigned long *) __va(page))[address >> 22]; diff --git a/arch/mn10300/proc-mn103e010/include/proc/cache.h b/arch/mn10300/proc-mn103e010/include/proc/cache.h index c1528004163c..967d144f307e 100644 --- a/arch/mn10300/proc-mn103e010/include/proc/cache.h +++ b/arch/mn10300/proc-mn103e010/include/proc/cache.h @@ -23,6 +23,7 @@ #define L1_CACHE_TAG_DIRTY 0x00000008 /* data cache tag dirty bit */ #define L1_CACHE_TAG_ENTRY 0x00000ff0 /* cache tag entry address mask */ #define L1_CACHE_TAG_ADDRESS 0xfffff000 /* cache tag line address mask */ +#define L1_CACHE_TAG_MASK +(L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY) /* * specification of the interval between interrupt checking intervals whilst diff --git a/arch/mn10300/proc-mn2ws0050/include/proc/cache.h b/arch/mn10300/proc-mn2ws0050/include/proc/cache.h index cafd7b5b55b4..bcb5df2d892f 100644 --- a/arch/mn10300/proc-mn2ws0050/include/proc/cache.h +++ b/arch/mn10300/proc-mn2ws0050/include/proc/cache.h @@ -29,6 +29,7 @@ #define L1_CACHE_TAG_DIRTY 0x00000008 /* data cache tag dirty bit */ #define L1_CACHE_TAG_ENTRY 0x00000fe0 /* cache tag entry address mask */ #define L1_CACHE_TAG_ADDRESS 0xfffff000 /* cache tag line address mask */ +#define L1_CACHE_TAG_MASK +(L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY) /* * specification of the interval between interrupt checking intervals whilst diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h index 092e4250a458..10ca03d0a250 100644 --- a/include/linux/kgdb.h +++ b/include/linux/kgdb.h @@ -297,6 +297,7 @@ extern int kgdb_handle_exception(int ex_vector, int signo, int err_code, struct pt_regs *regs); extern int kgdb_nmicallback(int cpu, void *regs); +extern void gdbstub_exit(int status); extern int kgdb_single_step; extern atomic_t kgdb_active; diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c index 481a7bd2dfe7..a11db956dd62 100644 --- a/kernel/debug/gdbstub.c +++ b/kernel/debug/gdbstub.c @@ -1093,3 +1093,33 @@ int gdbstub_state(struct kgdb_state *ks, char *cmd) put_packet(remcom_out_buffer); return 0; } + +/** + * gdbstub_exit - Send an exit message to GDB + * @status: The exit code to report. + */ +void gdbstub_exit(int status) +{ + unsigned char checksum, ch, buffer[3]; + int loop; + + buffer[0] = 'W'; + buffer[1] = hex_asc_hi(status); + buffer[2] = hex_asc_lo(status); + + dbg_io_ops->write_char('$'); + checksum = 0; + + for (loop = 0; loop < 3; loop++) { + ch = buffer[loop]; + checksum += ch; + dbg_io_ops->write_char(ch); + } + + dbg_io_ops->write_char('#'); + dbg_io_ops->write_char(hex_asc_hi(checksum)); + dbg_io_ops->write_char(hex_asc_lo(checksum)); + + /* make sure the output is flushed, lest the bootloader clobber it */ + dbg_io_ops->flush(); +} |