arch/x86/include/asm/ftrace.h

   1 #ifndef _ASM_X86_FTRACE_H
   2 #define _ASM_X86_FTRACE_H
   3
   4 #ifdef __ASSEMBLY__
   5
   6         /* skip is set if the stack was already partially adjusted */
   7         .macro MCOUNT_SAVE_FRAME skip=0
   8          /*
   9           * We add enough stack to save all regs.
  10           */
  11         subq $(SS+8-\skip), %rsp
  12         movq %rax, RAX(%rsp)
  13         movq %rcx, RCX(%rsp)
  14         movq %rdx, RDX(%rsp)
  15         movq %rsi, RSI(%rsp)
  16         movq %rdi, RDI(%rsp)
  17         movq %r8, R8(%rsp)
  18         movq %r9, R9(%rsp)
  19          /* Move RIP to its proper location */
  20         movq SS+8(%rsp), %rdx
  21         movq %rdx, RIP(%rsp)
  22         .endm
  23
  24         .macro MCOUNT_RESTORE_FRAME skip=0
  25         movq R9(%rsp), %r9
  26         movq R8(%rsp), %r8
  27         movq RDI(%rsp), %rdi
  28         movq RSI(%rsp), %rsi
  29         movq RDX(%rsp), %rdx
  30         movq RCX(%rsp), %rcx
  31         movq RAX(%rsp), %rax
  32         addq $(SS+8-\skip), %rsp
  33         .endm
  34
  35 #endif
  36
  37 #ifdef CONFIG_FUNCTION_TRACER
  38 #ifdef CC_USING_FENTRY
  39 # define MCOUNT_ADDR            ((long)(__fentry__))
  40 #else
  41 # define MCOUNT_ADDR            ((long)(mcount))
  42 #endif
  43 #define MCOUNT_INSN_SIZE        5 /* sizeof mcount call */
  44
  45 #ifdef CONFIG_DYNAMIC_FTRACE
  46 #define ARCH_SUPPORTS_FTRACE_OPS 1
  47 #endif
  48
  49 #ifndef __ASSEMBLY__
  50 extern void mcount(void);
  51 extern atomic_t modifying_ftrace_code;
  52 extern void __fentry__(void);
  53
  54 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  55 {
  56         /*
  57          * addr is the address of the mcount call instruction.
  58          * recordmcount does the necessary offset calculation.
  59          */
  60         return addr;
  61 }
  62
  63 #ifdef CONFIG_DYNAMIC_FTRACE
  64
  65 struct dyn_arch_ftrace {
  66         /* No extra data needed for x86 */
  67 };
  68
  69 int ftrace_int3_handler(struct pt_regs *regs);
  70
  71 #endif /*  CONFIG_DYNAMIC_FTRACE */
  72 #endif /* __ASSEMBLY__ */
  73 #endif /* CONFIG_FUNCTION_TRACER */
  74
  75 #endif /* _ASM_X86_FTRACE_H */