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| author | Zong Li <zong@andestech.com> | 2018-08-15 05:05:40 +0200 |
|---|---|---|
| committer | Greentime Hu <greentime@andestech.com> | 2018-09-04 08:45:18 +0200 |
| commit | 1e377ae9b04aef4dc531fa4c5f81b65d440ebcba (patch) | |
| tree | 4a43286c98a7ba45a865f7a75364d651f1e9d65e | |
| parent | nds32/ftrace: Support dynamic function graph tracer (diff) | |
| download | linux-1e377ae9b04aef4dc531fa4c5f81b65d440ebcba.tar.xz linux-1e377ae9b04aef4dc531fa4c5f81b65d440ebcba.zip | |
nds32/stack: Get real return address by using ftrace_graph_ret_addr
Function graph tracer has modified the return address to
'return_to_handler' on stack, and provide the 'ftrace_graph_ret_addr' to
get the real return address.
Signed-off-by: Zong Li <zong@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
| -rw-r--r-- | arch/nds32/kernel/stacktrace.c | 4 | ||||
| -rw-r--r-- | arch/nds32/kernel/traps.c | 30 |
2 files changed, 10 insertions, 24 deletions
diff --git a/arch/nds32/kernel/stacktrace.c b/arch/nds32/kernel/stacktrace.c index 8b231e910ea6..36bc87003e83 100644 --- a/arch/nds32/kernel/stacktrace.c +++ b/arch/nds32/kernel/stacktrace.c @@ -4,6 +4,7 @@ #include <linux/sched/debug.h> #include <linux/sched/task_stack.h> #include <linux/stacktrace.h> +#include <linux/ftrace.h> void save_stack_trace(struct stack_trace *trace) { @@ -16,6 +17,7 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) unsigned long *fpn; int skip = trace->skip; int savesched; + int graph_idx = 0; if (tsk == current) { __asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(fpn)); @@ -33,6 +35,8 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) fpp = fpn[FP_OFFSET]; if (!__kernel_text_address(lpp)) break; + else + lpp = ftrace_graph_ret_addr(tsk, &graph_idx, lpp, NULL); if (savesched || !in_sched_functions(lpp)) { if (skip) { diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c index f0e974347c26..7684c8f597ed 100644 --- a/arch/nds32/kernel/traps.c +++ b/arch/nds32/kernel/traps.c @@ -8,6 +8,7 @@ #include <linux/kdebug.h> #include <linux/sched/task_stack.h> #include <linux/uaccess.h> +#include <linux/ftrace.h> #include <asm/proc-fns.h> #include <asm/unistd.h> @@ -94,28 +95,6 @@ static void dump_instr(struct pt_regs *regs) set_fs(fs); } -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -#include <linux/ftrace.h> -static void -get_real_ret_addr(unsigned long *addr, struct task_struct *tsk, int *graph) -{ - if (*addr == (unsigned long)return_to_handler) { - int index = tsk->curr_ret_stack; - - if (tsk->ret_stack && index >= *graph) { - index -= *graph; - *addr = tsk->ret_stack[index].ret; - (*graph)++; - } - } -} -#else -static inline void -get_real_ret_addr(unsigned long *addr, struct task_struct *tsk, int *graph) -{ -} -#endif - #define LOOP_TIMES (100) static void __dump(struct task_struct *tsk, unsigned long *base_reg) { @@ -126,7 +105,8 @@ static void __dump(struct task_struct *tsk, unsigned long *base_reg) while (!kstack_end(base_reg)) { ret_addr = *base_reg++; if (__kernel_text_address(ret_addr)) { - get_real_ret_addr(&ret_addr, tsk, &graph); + ret_addr = ftrace_graph_ret_addr( + tsk, &graph, ret_addr, NULL); print_ip_sym(ret_addr); } if (--cnt < 0) @@ -145,7 +125,9 @@ static void __dump(struct task_struct *tsk, unsigned long *base_reg) next_fp = base_reg[FP_OFFSET]; #endif if (__kernel_text_address(ret_addr)) { - get_real_ret_addr(&ret_addr, tsk, &graph); + + ret_addr = ftrace_graph_ret_addr( + tsk, &graph, ret_addr, NULL); print_ip_sym(ret_addr); } if (--cnt < 0) |