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 # define FTRACE_ADDR ((unsigned long)ftrace_caller)
  50 # define FTRACE_REGS_ADDR FTRACE_ADDR
  51 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  52 {
  53        /* reloction of mcount call site is the same as the address */
  54        return addr;
  55 }
  56
  57 struct dyn_arch_ftrace {
  58         struct module *mod;
  59 };
  60 #endif /*  CONFIG_DYNAMIC_FTRACE */
  61 #endif /* __ASSEMBLY__ */
  62
  63 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
  64 #define ARCH_SUPPORTS_FTRACE_OPS 1
  65 #endif
  66 #endif
  67
  68 #if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_PPC64) && !defined(__ASSEMBLY__)
  69 #if !defined(_CALL_ELF) || _CALL_ELF != 2
  70 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  71 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  72 {
  73         /*
  74          * Compare the symbol name with the system call name. Skip the .sys or .SyS
  75          * prefix from the symbol name and the sys prefix from the system call name and
  76          * just match the rest. This is only needed on ppc64 since symbol names on
  77          * 32bit do not start with a period so the generic function will work.
  78          */
  79         return !strcmp(sym + 4, name + 3);
  80 }
  81 #endif
  82 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 && !__ASSEMBLY__ */
  83
  84 #endif /* _ASM_POWERPC_FTRACE */