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Diffstat (limited to 'arch/mn10300/kernel/kgdb.c')
-rw-r--r--arch/mn10300/kernel/kgdb.c502
1 files changed, 0 insertions, 502 deletions
diff --git a/arch/mn10300/kernel/kgdb.c b/arch/mn10300/kernel/kgdb.c
deleted file mode 100644
index 2d7986c386fe..000000000000
--- a/arch/mn10300/kernel/kgdb.c
+++ /dev/null
@@ -1,502 +0,0 @@
-/* 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 arch_release_thread_stack(unsigned long *stack)
-{
-	struct thread_info *ti = (void *)stack;
-	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();
-	}
-}
-
-/*
- * 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
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