diff options
Diffstat (limited to 'arch/s390/include/asm/ftrace.h')
| -rw-r--r-- | arch/s390/include/asm/ftrace.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h index fbadca645af7..406746666eb7 100644 --- a/arch/s390/include/asm/ftrace.h +++ b/arch/s390/include/asm/ftrace.h @@ -6,8 +6,23 @@ #define MCOUNT_INSN_SIZE 6 #ifndef __ASSEMBLY__ +#include <asm/stacktrace.h> -unsigned long return_address(unsigned int n); +static __always_inline unsigned long return_address(unsigned int n) +{ + struct stack_frame *sf; + + if (!n) + return (unsigned long)__builtin_return_address(0); + + sf = (struct stack_frame *)current_frame_address(); + do { + sf = (struct stack_frame *)sf->back_chain; + if (!sf) + return 0; + } while (--n); + return sf->gprs[8]; +} #define ftrace_return_address(n) return_address(n) void ftrace_caller(void); |