diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/kernel/ftrace.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/kernel/ftrace.c | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/ANDROID_3.4.5/arch/arm/kernel/ftrace.c b/ANDROID_3.4.5/arch/arm/kernel/ftrace.c deleted file mode 100644 index 6a740a93..00000000 --- a/ANDROID_3.4.5/arch/arm/kernel/ftrace.c +++ /dev/null @@ -1,260 +0,0 @@ -/* - * Dynamic function tracing support. - * - * Copyright (C) 2008 Abhishek Sagar <sagar.abhishek@gmail.com> - * Copyright (C) 2010 Rabin Vincent <rabin@rab.in> - * - * For licencing details, see COPYING. - * - * Defines low-level handling of mcount calls when the kernel - * is compiled with the -pg flag. When using dynamic ftrace, the - * mcount call-sites get patched with NOP till they are enabled. - * All code mutation routines here are called under stop_machine(). - */ - -#include <linux/ftrace.h> -#include <linux/module.h> -#include <linux/uaccess.h> - -#include <asm/cacheflush.h> -#include <asm/opcodes.h> -#include <asm/ftrace.h> - -#include "insn.h" - -#ifdef CONFIG_THUMB2_KERNEL -#define NOP 0xf85deb04 /* pop.w {lr} */ -#else -#define NOP 0xe8bd4000 /* pop {lr} */ -#endif - -#ifdef CONFIG_DYNAMIC_FTRACE -#ifdef CONFIG_OLD_MCOUNT -#define OLD_MCOUNT_ADDR ((unsigned long) mcount) -#define OLD_FTRACE_ADDR ((unsigned long) ftrace_caller_old) - -#define OLD_NOP 0xe1a00000 /* mov r0, r0 */ - -static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec) -{ - return rec->arch.old_mcount ? OLD_NOP : NOP; -} - -static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr) -{ - if (!rec->arch.old_mcount) - return addr; - - if (addr == MCOUNT_ADDR) - addr = OLD_MCOUNT_ADDR; - else if (addr == FTRACE_ADDR) - addr = OLD_FTRACE_ADDR; - - return addr; -} -#else -static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec) -{ - return NOP; -} - -static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr) -{ - return addr; -} -#endif - -int ftrace_arch_code_modify_prepare(void) -{ - set_kernel_text_rw(); - set_all_modules_text_rw(); - return 0; -} - -int ftrace_arch_code_modify_post_process(void) -{ - set_all_modules_text_ro(); - set_kernel_text_ro(); - return 0; -} - -static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr) -{ - return arm_gen_branch_link(pc, addr); -} - -static int ftrace_modify_code(unsigned long pc, unsigned long old, - unsigned long new, bool validate) -{ - unsigned long replaced; - - if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) { - old = __opcode_to_mem_thumb32(old); - new = __opcode_to_mem_thumb32(new); - } else { - old = __opcode_to_mem_arm(old); - new = __opcode_to_mem_arm(new); - } - - if (validate) { - if (probe_kernel_read(&replaced, (void *)pc, MCOUNT_INSN_SIZE)) - return -EFAULT; - - if (replaced != old) - return -EINVAL; - } - - if (probe_kernel_write((void *)pc, &new, MCOUNT_INSN_SIZE)) - return -EPERM; - - flush_icache_range(pc, pc + MCOUNT_INSN_SIZE); - - return 0; -} - -int ftrace_update_ftrace_func(ftrace_func_t func) -{ - unsigned long pc; - unsigned long new; - int ret; - - pc = (unsigned long)&ftrace_call; - new = ftrace_call_replace(pc, (unsigned long)func); - - ret = ftrace_modify_code(pc, 0, new, false); - -#ifdef CONFIG_OLD_MCOUNT - if (!ret) { - pc = (unsigned long)&ftrace_call_old; - new = ftrace_call_replace(pc, (unsigned long)func); - - ret = ftrace_modify_code(pc, 0, new, false); - } -#endif - - 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, adjust_address(rec, addr)); - - return ftrace_modify_code(rec->ip, old, new, true); -} - -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, adjust_address(rec, addr)); - new = ftrace_nop_replace(rec); - ret = ftrace_modify_code(ip, old, new, true); - -#ifdef CONFIG_OLD_MCOUNT - if (ret == -EINVAL && addr == MCOUNT_ADDR) { - rec->arch.old_mcount = true; - - old = ftrace_call_replace(ip, adjust_address(rec, addr)); - new = ftrace_nop_replace(rec); - ret = ftrace_modify_code(ip, old, new, true); - } -#endif - - return ret; -} - -int __init ftrace_dyn_arch_init(void *data) -{ - *(unsigned long *)data = 0; - - 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(¤t->tracing_graph_pause))) - return; - - old = *parent; - *parent = return_hooker; - - trace.func = self_addr; - trace.depth = current->curr_ret_stack + 1; - - /* Only trace if the calling function expects to */ - if (!ftrace_graph_entry(&trace)) { - *parent = old; - return; - } - - err = ftrace_push_return_trace(old, self_addr, &trace.depth, - frame_pointer); - if (err == -EBUSY) { - *parent = old; - return; - } -} - -#ifdef CONFIG_DYNAMIC_FTRACE -extern unsigned long ftrace_graph_call; -extern unsigned long ftrace_graph_call_old; -extern void ftrace_graph_caller_old(void); - -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 = arm_gen_branch(pc, caller_fn); - unsigned long nop = 0xe1a00000; /* mov r0, r0 */ - unsigned long old = enable ? nop : branch; - unsigned long new = enable ? branch : nop; - - return ftrace_modify_code(pc, old, new, true); -} - -static int ftrace_modify_graph_caller(bool enable) -{ - int ret; - - ret = __ftrace_modify_caller(&ftrace_graph_call, - ftrace_graph_caller, - enable); - -#ifdef CONFIG_OLD_MCOUNT - if (!ret) - ret = __ftrace_modify_caller(&ftrace_graph_call_old, - ftrace_graph_caller_old, - enable); -#endif - - 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 */ |