arch/x86/include/asm/ftrace.h

   1 #ifndef _ASM_X86_FTRACE_H
   2 #define _ASM_X86_FTRACE_H
   3
   4 #ifdef __ASSEMBLY__
   5
   6         .macro MCOUNT_SAVE_FRAME
   7         /* taken from glibc */
   8         subq $0x38, %rsp
   9         movq %rax, (%rsp)
  10         movq %rcx, 8(%rsp)
  11         movq %rdx, 16(%rsp)
  12         movq %rsi, 24(%rsp)
  13         movq %rdi, 32(%rsp)
  14         movq %r8, 40(%rsp)
  15         movq %r9, 48(%rsp)
  16         .endm
  17
  18         .macro MCOUNT_RESTORE_FRAME
  19         movq 48(%rsp), %r9
  20         movq 40(%rsp), %r8
  21         movq 32(%rsp), %rdi
  22         movq 24(%rsp), %rsi
  23         movq 16(%rsp), %rdx
  24         movq 8(%rsp), %rcx
  25         movq (%rsp), %rax
  26         addq $0x38, %rsp
  27         .endm
  28
  29 #endif
  30
  31 /* FIXME: I don't want to stay hardcoded */
  32 #ifdef CONFIG_X86_64
  33 # define FTRACE_SYSCALL_MAX     296
  34 #else
  35 # define FTRACE_SYSCALL_MAX     333
  36 #endif
  37
  38 #ifdef CONFIG_FUNCTION_TRACER
  39 #define MCOUNT_ADDR             ((long)(mcount))
  40 #define MCOUNT_INSN_SIZE        5 /* sizeof mcount call */
  41
  42 #ifndef __ASSEMBLY__
  43 extern void mcount(void);
  44
  45 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  46 {
  47         /*
  48          * call mcount is "e8 <4 byte offset>"
  49          * The addr points to the 4 byte offset and the caller of this
  50          * function wants the pointer to e8. Simply subtract one.
  51          */
  52         return addr - 1;
  53 }
  54
  55 #ifdef CONFIG_DYNAMIC_FTRACE
  56
  57 struct dyn_arch_ftrace {
  58         /* No extra data needed for x86 */
  59 };
  60
  61 #endif /*  CONFIG_DYNAMIC_FTRACE */
  62 #endif /* __ASSEMBLY__ */
  63 #endif /* CONFIG_FUNCTION_TRACER */
  64
  65 #endif /* _ASM_X86_FTRACE_H */