summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--arch/x86/include/asm/ftrace.h9
-rw-r--r--arch/x86/kernel/ftrace.c37
-rw-r--r--arch/x86/kernel/ftrace_64.S29
-rw-r--r--include/linux/ftrace.h9
-rw-r--r--kernel/trace/fgraph.c6
5 files changed, 55 insertions, 35 deletions
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index 9f3130f40807..024d9797646e 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -57,6 +57,13 @@ arch_ftrace_get_regs(struct ftrace_regs *fregs)
#define ftrace_instruction_pointer_set(fregs, _ip) \
do { (fregs)->regs.ip = (_ip); } while (0)
+
+struct ftrace_ops;
+#define ftrace_graph_func ftrace_graph_func
+void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *op, struct ftrace_regs *fregs);
+#else
+#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
@@ -65,8 +72,6 @@ struct dyn_arch_ftrace {
/* No extra data needed for x86 */
};
-#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
-
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_FUNCTION_TRACER */
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 7f12eacdf1ae..c39f906cdc4e 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -522,7 +522,7 @@ static void *addr_from_call(void *ptr)
return ptr + CALL_INSN_SIZE + call.disp;
}
-void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent,
+void prepare_ftrace_return(unsigned long ip, unsigned long *parent,
unsigned long frame_pointer);
/*
@@ -536,7 +536,8 @@ static void *static_tramp_func(struct ftrace_ops *ops, struct dyn_ftrace *rec)
void *ptr;
if (ops && ops->trampoline) {
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+#if !defined(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS) && \
+ defined(CONFIG_FUNCTION_GRAPH_TRACER)
/*
* We only know about function graph tracer setting as static
* trampoline.
@@ -584,8 +585,9 @@ void arch_ftrace_trampoline_free(struct ftrace_ops *ops)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
#ifdef CONFIG_DYNAMIC_FTRACE
-extern void ftrace_graph_call(void);
+#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
+extern void ftrace_graph_call(void);
static const char *ftrace_jmp_replace(unsigned long ip, unsigned long addr)
{
return text_gen_insn(JMP32_INSN_OPCODE, (void *)ip, (void *)addr);
@@ -613,7 +615,17 @@ int ftrace_disable_ftrace_graph_caller(void)
return ftrace_mod_jmp(ip, &ftrace_stub);
}
+#else /* !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
+int ftrace_enable_ftrace_graph_caller(void)
+{
+ return 0;
+}
+int ftrace_disable_ftrace_graph_caller(void)
+{
+ return 0;
+}
+#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
#endif /* !CONFIG_DYNAMIC_FTRACE */
/*
@@ -624,6 +636,7 @@ void prepare_ftrace_return(unsigned long ip, unsigned long *parent,
unsigned long frame_pointer)
{
unsigned long return_hooker = (unsigned long)&return_to_handler;
+ int bit;
/*
* When resuming from suspend-to-ram, this function can be indirectly
@@ -643,7 +656,25 @@ void prepare_ftrace_return(unsigned long ip, unsigned long *parent,
if (unlikely(atomic_read(&current->tracing_graph_pause)))
return;
+ bit = ftrace_test_recursion_trylock(ip, *parent);
+ if (bit < 0)
+ return;
+
if (!function_graph_enter(*parent, ip, frame_pointer, parent))
*parent = return_hooker;
+
+ ftrace_test_recursion_unlock(bit);
+}
+
+#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
+void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *op, struct ftrace_regs *fregs)
+{
+ struct pt_regs *regs = &fregs->regs;
+ unsigned long *stack = (unsigned long *)kernel_stack_pointer(regs);
+
+ prepare_ftrace_return(ip, (unsigned long *)stack, 0);
}
+#endif
+
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
diff --git a/arch/x86/kernel/ftrace_64.S b/arch/x86/kernel/ftrace_64.S
index a8eb084a7a9a..7a879901f103 100644
--- a/arch/x86/kernel/ftrace_64.S
+++ b/arch/x86/kernel/ftrace_64.S
@@ -174,11 +174,6 @@ SYM_INNER_LABEL(ftrace_caller_end, SYM_L_GLOBAL)
SYM_FUNC_END(ftrace_caller);
SYM_FUNC_START(ftrace_epilogue)
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-SYM_INNER_LABEL(ftrace_graph_call, SYM_L_GLOBAL)
- jmp ftrace_stub
-#endif
-
/*
* This is weak to keep gas from relaxing the jumps.
* It is also used to copy the retq for trampolines.
@@ -288,15 +283,6 @@ SYM_FUNC_START(__fentry__)
cmpq $ftrace_stub, ftrace_trace_function
jnz trace
-fgraph_trace:
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
- cmpq $ftrace_stub, ftrace_graph_return
- jnz ftrace_graph_caller
-
- cmpq $ftrace_graph_entry_stub, ftrace_graph_entry
- jnz ftrace_graph_caller
-#endif
-
SYM_INNER_LABEL(ftrace_stub, SYM_L_GLOBAL)
retq
@@ -314,25 +300,12 @@ trace:
CALL_NOSPEC r8
restore_mcount_regs
- jmp fgraph_trace
+ jmp ftrace_stub
SYM_FUNC_END(__fentry__)
EXPORT_SYMBOL(__fentry__)
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-SYM_FUNC_START(ftrace_graph_caller)
- /* Saves rbp into %rdx and fills first parameter */
- save_mcount_regs
-
- leaq MCOUNT_REG_SIZE+8(%rsp), %rsi
- movq $0, %rdx /* No framepointers needed */
- call prepare_ftrace_return
-
- restore_mcount_regs
-
- retq
-SYM_FUNC_END(ftrace_graph_caller)
-
SYM_FUNC_START(return_to_handler)
subq $24, %rsp
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 12fcfa2d23ea..16a7baaba702 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -803,6 +803,15 @@ static inline bool is_ftrace_trampoline(unsigned long addr)
}
#endif /* CONFIG_DYNAMIC_FTRACE */
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+#ifndef ftrace_graph_func
+#define ftrace_graph_func ftrace_stub
+#define FTRACE_OPS_GRAPH_STUB FTRACE_OPS_FL_STUB
+#else
+#define FTRACE_OPS_GRAPH_STUB 0
+#endif
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
/* totally disable ftrace - can not re-enable after this */
void ftrace_kill(void);
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index b8a0d1d564fb..22061d38fc00 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -115,6 +115,7 @@ int function_graph_enter(unsigned long ret, unsigned long func,
{
struct ftrace_graph_ent trace;
+#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
/*
* Skip graph tracing if the return location is served by direct trampoline,
* since call sequence and return addresses are unpredictable anyway.
@@ -124,6 +125,7 @@ int function_graph_enter(unsigned long ret, unsigned long func,
if (ftrace_direct_func_count &&
ftrace_find_rec_direct(ret - MCOUNT_INSN_SIZE))
return -EBUSY;
+#endif
trace.func = func;
trace.depth = ++current->curr_ret_depth;
@@ -333,10 +335,10 @@ unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
#endif /* HAVE_FUNCTION_GRAPH_RET_ADDR_PTR */
static struct ftrace_ops graph_ops = {
- .func = ftrace_stub,
+ .func = ftrace_graph_func,
.flags = FTRACE_OPS_FL_INITIALIZED |
FTRACE_OPS_FL_PID |
- FTRACE_OPS_FL_STUB,
+ FTRACE_OPS_GRAPH_STUB,
#ifdef FTRACE_GRAPH_TRAMP_ADDR
.trampoline = FTRACE_GRAPH_TRAMP_ADDR,
/* trampoline_size is only needed for dynamically allocated tramps */
generated by cgit (git 2.34.1) at 2024-06-19 19:19:45 +0000