arch/powerpc/include/asm/ftrace.h

   1 #ifndef _ASM_POWERPC_FTRACE
   2 #define _ASM_POWERPC_FTRACE
   3
   4 #ifdef CONFIG_FUNCTION_TRACER
   5 #define MCOUNT_ADDR             ((unsigned long)(_mcount))
   6 #define MCOUNT_INSN_SIZE        4 /* sizeof mcount call */
   7
   8 #ifdef __ASSEMBLY__
   9
  10 /* Based off of objdump optput from glibc */
  11
  12 #define MCOUNT_SAVE_FRAME                       \
  13         stwu    r1,-48(r1);                     \
  14         stw     r3, 12(r1);                     \
  15         stw     r4, 16(r1);                     \
  16         stw     r5, 20(r1);                     \
  17         stw     r6, 24(r1);                     \
  18         mflr    r3;                             \
  19         lwz     r4, 52(r1);                     \
  20         mfcr    r5;                             \
  21         stw     r7, 28(r1);                     \
  22         stw     r8, 32(r1);                     \
  23         stw     r9, 36(r1);                     \
  24         stw     r10,40(r1);                     \
  25         stw     r3, 44(r1);                     \
  26         stw     r5, 8(r1)
  27
  28 #define MCOUNT_RESTORE_FRAME                    \
  29         lwz     r6, 8(r1);                      \
  30         lwz     r0, 44(r1);                     \
  31         lwz     r3, 12(r1);                     \
  32         mtctr   r0;                             \
  33         lwz     r4, 16(r1);                     \
  34         mtcr    r6;                             \
  35         lwz     r5, 20(r1);                     \
  36         lwz     r6, 24(r1);                     \
  37         lwz     r0, 52(r1);                     \
  38         lwz     r7, 28(r1);                     \
  39         lwz     r8, 32(r1);                     \
  40         mtlr    r0;                             \
  41         lwz     r9, 36(r1);                     \
  42         lwz     r10,40(r1);                     \
  43         addi    r1, r1, 48
  44
  45 #else /* !__ASSEMBLY__ */
  46 extern void _mcount(void);
  47
  48 #ifdef CONFIG_DYNAMIC_FTRACE
  49 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  50 {
  51        /* reloction of mcount call site is the same as the address */
  52        return addr;
  53 }
  54
  55 struct dyn_arch_ftrace {
  56         struct module *mod;
  57 };
  58 #endif /*  CONFIG_DYNAMIC_FTRACE */
  59 #endif /* __ASSEMBLY__ */
  60
  61 #endif
  62
  63 #if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_PPC64) && !defined(__ASSEMBLY__)
  64 #if !defined(_CALL_ELF) || _CALL_ELF != 2
  65 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  66 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  67 {
  68         /*
  69          * Compare the symbol name with the system call name. Skip the .sys or .SyS
  70          * prefix from the symbol name and the sys prefix from the system call name and
  71          * just match the rest. This is only needed on ppc64 since symbol names on
  72          * 32bit do not start with a period so the generic function will work.
  73          */
  74         return !strcmp(sym + 4, name + 3);
  75 }
  76 #endif
  77 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 && !__ASSEMBLY__ */
  78
  79 #endif /* _ASM_POWERPC_FTRACE */