x86: Introduce frame_pointer() and stack_pointer() From: jblunck@suse.de This patch defines frame_pointer() and stack_pointer() similar to the already defined instruction_pointer(). Thus the oprofile code can be written in a more readable fashion. Signed-off-by: Jan Blunck Signed-off-by: Andi Kleen --- arch/i386/oprofile/backtrace.c | 12 ++---------- include/asm-i386/ptrace.h | 2 ++ include/asm-x86_64/ptrace.h | 2 ++ 3 files changed, 6 insertions(+), 10 deletions(-) Index: linux/arch/i386/oprofile/backtrace.c =================================================================== --- linux.orig/arch/i386/oprofile/backtrace.c +++ linux/arch/i386/oprofile/backtrace.c @@ -76,16 +76,8 @@ dump_user_backtrace(struct frame_head * void x86_backtrace(struct pt_regs * const regs, unsigned int depth) { - struct frame_head *head; - unsigned long stack; - -#ifdef CONFIG_X86_64 - head = (struct frame_head *)regs->rbp; - stack = regs->rsp; -#else - head = (struct frame_head *)regs->ebp; - stack = regs->esp; -#endif + struct frame_head *head = (struct frame_head *)frame_pointer(regs); + unsigned long stack = stack_pointer(regs); if (!user_mode_vm(regs)) { if (depth) Index: linux/include/asm-i386/ptrace.h =================================================================== --- linux.orig/include/asm-i386/ptrace.h +++ linux/include/asm-i386/ptrace.h @@ -55,6 +55,8 @@ static inline int v8086_mode(struct pt_r } #define instruction_pointer(regs) ((regs)->eip) +#define frame_pointer(regs) ((regs)->ebp) +#define stack_pointer(regs) ((regs)->esp) #define regs_return_value(regs) ((regs)->eax) extern unsigned long profile_pc(struct pt_regs *regs); Index: linux/include/asm-x86_64/ptrace.h =================================================================== --- linux.orig/include/asm-x86_64/ptrace.h +++ linux/include/asm-x86_64/ptrace.h @@ -40,6 +40,8 @@ struct pt_regs { #define user_mode(regs) (!!((regs)->cs & 3)) #define user_mode_vm(regs) user_mode(regs) #define instruction_pointer(regs) ((regs)->rip) +#define frame_pointer(regs) ((regs)->rbp) +#define stack_pointer(regs) ((regs)->rsp) #define regs_return_value(regs) ((regs)->rax) extern unsigned long profile_pc(struct pt_regs *regs);