arch/powerpc/include/asm/ftrace.h

   1 #ifndef _ASM_POWERPC_FTRACE
   2 #define _ASM_POWERPC_FTRACE
   3
   4 #include <asm/types.h>
   5
   6 #ifdef CONFIG_FUNCTION_TRACER
   7 #define MCOUNT_ADDR             ((unsigned long)(_mcount))
   8 #define MCOUNT_INSN_SIZE        4 /* sizeof mcount call */
   9
  10 #ifdef __ASSEMBLY__
  11
  12 /* Based off of objdump optput from glibc */
  13
  14 #define MCOUNT_SAVE_FRAME                       \
  15         stwu    r1,-48(r1);                     \
  16         stw     r3, 12(r1);                     \
  17         stw     r4, 16(r1);                     \
  18         stw     r5, 20(r1);                     \
  19         stw     r6, 24(r1);                     \
  20         mflr    r3;                             \
  21         lwz     r4, 52(r1);                     \
  22         mfcr    r5;                             \
  23         stw     r7, 28(r1);                     \
  24         stw     r8, 32(r1);                     \
  25         stw     r9, 36(r1);                     \
  26         stw     r10,40(r1);                     \
  27         stw     r3, 44(r1);                     \
  28         stw     r5, 8(r1)
  29
  30 #define MCOUNT_RESTORE_FRAME                    \
  31         lwz     r6, 8(r1);                      \
  32         lwz     r0, 44(r1);                     \
  33         lwz     r3, 12(r1);                     \
  34         mtctr   r0;                             \
  35         lwz     r4, 16(r1);                     \
  36         mtcr    r6;                             \
  37         lwz     r5, 20(r1);                     \
  38         lwz     r6, 24(r1);                     \
  39         lwz     r0, 52(r1);                     \
  40         lwz     r7, 28(r1);                     \
  41         lwz     r8, 32(r1);                     \
  42         mtlr    r0;                             \
  43         lwz     r9, 36(r1);                     \
  44         lwz     r10,40(r1);                     \
  45         addi    r1, r1, 48
  46
  47 #else /* !__ASSEMBLY__ */
  48 extern void _mcount(void);
  49
  50 #ifdef CONFIG_DYNAMIC_FTRACE
  51 # define FTRACE_ADDR ((unsigned long)ftrace_caller)
  52 # define FTRACE_REGS_ADDR FTRACE_ADDR
  53 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  54 {
  55        /* reloction of mcount call site is the same as the address */
  56        return addr;
  57 }
  58
  59 struct dyn_arch_ftrace {
  60         struct module *mod;
  61 };
  62 #endif /*  CONFIG_DYNAMIC_FTRACE */
  63 #endif /* __ASSEMBLY__ */
  64
  65 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
  66 #define ARCH_SUPPORTS_FTRACE_OPS 1
  67 #endif
  68 #endif
  69
  70 #if defined(CONFIG_FTRACE_SYSCALLS) && !defined(__ASSEMBLY__)
  71 #ifdef PPC64_ELF_ABI_v1
  72 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  73 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  74 {
  75         /*
  76          * Compare the symbol name with the system call name. Skip the .sys or .SyS
  77          * prefix from the symbol name and the sys prefix from the system call name and
  78          * just match the rest. This is only needed on ppc64 since symbol names on
  79          * 32bit do not start with a period so the generic function will work.
  80          */
  81         return !strcmp(sym + 4, name + 3);
  82 }
  83 #endif
  84 #endif /* CONFIG_FTRACE_SYSCALLS && !__ASSEMBLY__ */
  85
  86 #endif /* _ASM_POWERPC_FTRACE */