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-rw-r--r--arch/tile/kernel/ftrace.c239
1 files changed, 0 insertions, 239 deletions
diff --git a/arch/tile/kernel/ftrace.c b/arch/tile/kernel/ftrace.c
deleted file mode 100644
index b827a418b155..000000000000
--- a/arch/tile/kernel/ftrace.c
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
- * Copyright 2012 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- *
- * TILE-Gx specific ftrace support
- */
-
-#include <linux/ftrace.h>
-#include <linux/uaccess.h>
-
-#include <asm/cacheflush.h>
-#include <asm/ftrace.h>
-#include <asm/sections.h>
-#include <asm/insn.h>
-
-#include <arch/opcode.h>
-
-#ifdef CONFIG_DYNAMIC_FTRACE
-
-static int machine_stopped __read_mostly;
-
-int ftrace_arch_code_modify_prepare(void)
-{
-	machine_stopped = 1;
-	return 0;
-}
-
-int ftrace_arch_code_modify_post_process(void)
-{
-	flush_icache_range(0, CHIP_L1I_CACHE_SIZE());
-	machine_stopped = 0;
-	return 0;
-}
-
-/*
- * Put { move r10, lr; jal ftrace_caller } in a bundle, this lets dynamic
- * tracer just add one cycle overhead to every kernel function when disabled.
- */
-static unsigned long ftrace_gen_branch(unsigned long pc, unsigned long addr,
-				       bool link)
-{
-	tilegx_bundle_bits opcode_x0, opcode_x1;
-	long pcrel_by_instr = (addr - pc) >> TILEGX_LOG2_BUNDLE_SIZE_IN_BYTES;
-
-	if (link) {
-		/* opcode: jal addr */
-		opcode_x1 =
-			create_Opcode_X1(JUMP_OPCODE_X1) |
-			create_JumpOpcodeExtension_X1(JAL_JUMP_OPCODE_X1) |
-			create_JumpOff_X1(pcrel_by_instr);
-	} else {
-		/* opcode: j addr */
-		opcode_x1 =
-			create_Opcode_X1(JUMP_OPCODE_X1) |
-			create_JumpOpcodeExtension_X1(J_JUMP_OPCODE_X1) |
-			create_JumpOff_X1(pcrel_by_instr);
-	}
-
-	/*
-	 * Also put { move r10, lr; jal ftrace_stub } in a bundle, which
-	 * is used to replace the instruction in address ftrace_call.
-	 */
-	if (addr == FTRACE_ADDR || addr == (unsigned long)ftrace_stub) {
-		/* opcode: or r10, lr, zero */
-		opcode_x0 =
-			create_Dest_X0(10) |
-			create_SrcA_X0(TREG_LR) |
-			create_SrcB_X0(TREG_ZERO) |
-			create_RRROpcodeExtension_X0(OR_RRR_0_OPCODE_X0) |
-			create_Opcode_X0(RRR_0_OPCODE_X0);
-	} else {
-		/* opcode: fnop */
-		opcode_x0 =
-			create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) |
-			create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) |
-			create_Opcode_X0(RRR_0_OPCODE_X0);
-	}
-
-	return opcode_x1 | opcode_x0;
-}
-
-static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec)
-{
-	return NOP();
-}
-
-static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr)
-{
-	return ftrace_gen_branch(pc, addr, true);
-}
-
-static int ftrace_modify_code(unsigned long pc, unsigned long old,
-			      unsigned long new)
-{
-	unsigned long pc_wr;
-
-	/* Check if the address is in kernel text space and module space. */
-	if (!kernel_text_address(pc))
-		return -EINVAL;
-
-	/* Operate on writable kernel text mapping. */
-	pc_wr = ktext_writable_addr(pc);
-
-	if (probe_kernel_write((void *)pc_wr, &new, MCOUNT_INSN_SIZE))
-		return -EPERM;
-
-	smp_wmb();
-
-	if (!machine_stopped && num_online_cpus() > 1)
-		flush_icache_range(pc, pc + MCOUNT_INSN_SIZE);
-
-	return 0;
-}
-
-int ftrace_update_ftrace_func(ftrace_func_t func)
-{
-	unsigned long pc, old;
-	unsigned long new;
-	int ret;
-
-	pc = (unsigned long)&ftrace_call;
-	memcpy(&old, &ftrace_call, MCOUNT_INSN_SIZE);
-	new = ftrace_call_replace(pc, (unsigned long)func);
-
-	ret = ftrace_modify_code(pc, old, new);
-
-	return ret;
-}
-
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
-{
-	unsigned long new, old;
-	unsigned long ip = rec->ip;
-
-	old = ftrace_nop_replace(rec);
-	new = ftrace_call_replace(ip, addr);
-
-	return ftrace_modify_code(rec->ip, old, new);
-}
-
-int ftrace_make_nop(struct module *mod,
-		    struct dyn_ftrace *rec, unsigned long addr)
-{
-	unsigned long ip = rec->ip;
-	unsigned long old;
-	unsigned long new;
-	int ret;
-
-	old = ftrace_call_replace(ip, addr);
-	new = ftrace_nop_replace(rec);
-	ret = ftrace_modify_code(ip, old, new);
-
-	return ret;
-}
-
-int __init ftrace_dyn_arch_init(void)
-{
-	return 0;
-}
-#endif /* CONFIG_DYNAMIC_FTRACE */
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
-			   unsigned long frame_pointer)
-{
-	unsigned long return_hooker = (unsigned long) &return_to_handler;
-	struct ftrace_graph_ent trace;
-	unsigned long old;
-	int err;
-
-	if (unlikely(atomic_read(&current->tracing_graph_pause)))
-		return;
-
-	old = *parent;
-	*parent = return_hooker;
-
-	err = ftrace_push_return_trace(old, self_addr, &trace.depth,
-				       frame_pointer, NULL);
-	if (err == -EBUSY) {
-		*parent = old;
-		return;
-	}
-
-	trace.func = self_addr;
-
-	/* Only trace if the calling function expects to */
-	if (!ftrace_graph_entry(&trace)) {
-		current->curr_ret_stack--;
-		*parent = old;
-	}
-}
-
-#ifdef CONFIG_DYNAMIC_FTRACE
-extern unsigned long ftrace_graph_call;
-
-static int __ftrace_modify_caller(unsigned long *callsite,
-				  void (*func) (void), bool enable)
-{
-	unsigned long caller_fn = (unsigned long) func;
-	unsigned long pc = (unsigned long) callsite;
-	unsigned long branch = ftrace_gen_branch(pc, caller_fn, false);
-	unsigned long nop = NOP();
-	unsigned long old = enable ? nop : branch;
-	unsigned long new = enable ? branch : nop;
-
-	return ftrace_modify_code(pc, old, new);
-}
-
-static int ftrace_modify_graph_caller(bool enable)
-{
-	int ret;
-
-	ret = __ftrace_modify_caller(&ftrace_graph_call,
-				     ftrace_graph_caller,
-				     enable);
-
-	return ret;
-}
-
-int ftrace_enable_ftrace_graph_caller(void)
-{
-	return ftrace_modify_graph_caller(true);
-}
-
-int ftrace_disable_ftrace_graph_caller(void)
-{
-	return ftrace_modify_graph_caller(false);
-}
-#endif /* CONFIG_DYNAMIC_FTRACE */
-#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-10-12 21:26:41 +0000