arch/powerpc/include/asm/ftrace.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_FTRACE
   3 #define _ASM_POWERPC_FTRACE
   4
   5 #include <asm/types.h>
   6
   7 #ifdef CONFIG_FUNCTION_TRACER
   8 #define MCOUNT_ADDR             ((unsigned long)(_mcount))
   9 #define MCOUNT_INSN_SIZE        4 /* sizeof mcount call */
  10
  11 #ifdef __ASSEMBLY__
  12
  13 /* Based off of objdump optput from glibc */
  14
  15 #define MCOUNT_SAVE_FRAME                       \
  16         stwu    r1,-48(r1);                     \
  17         stw     r3, 12(r1);                     \
  18         stw     r4, 16(r1);                     \
  19         stw     r5, 20(r1);                     \
  20         stw     r6, 24(r1);                     \
  21         mflr    r3;                             \
  22         lwz     r4, 52(r1);                     \
  23         mfcr    r5;                             \
  24         stw     r7, 28(r1);                     \
  25         stw     r8, 32(r1);                     \
  26         stw     r9, 36(r1);                     \
  27         stw     r10,40(r1);                     \
  28         stw     r3, 44(r1);                     \
  29         stw     r5, 8(r1)
  30
  31 #define MCOUNT_RESTORE_FRAME                    \
  32         lwz     r6, 8(r1);                      \
  33         lwz     r0, 44(r1);                     \
  34         lwz     r3, 12(r1);                     \
  35         mtctr   r0;                             \
  36         lwz     r4, 16(r1);                     \
  37         mtcr    r6;                             \
  38         lwz     r5, 20(r1);                     \
  39         lwz     r6, 24(r1);                     \
  40         lwz     r0, 52(r1);                     \
  41         lwz     r7, 28(r1);                     \
  42         lwz     r8, 32(r1);                     \
  43         mtlr    r0;                             \
  44         lwz     r9, 36(r1);                     \
  45         lwz     r10,40(r1);                     \
  46         addi    r1, r1, 48
  47
  48 #else /* !__ASSEMBLY__ */
  49 extern void _mcount(void);
  50
  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 /* __ASSEMBLY__ */
  61
  62 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
  63 #define ARCH_SUPPORTS_FTRACE_OPS 1
  64 #endif
  65 #endif /* CONFIG_FUNCTION_TRACER */
  66
  67 #ifndef __ASSEMBLY__
  68 #ifdef CONFIG_FTRACE_SYSCALLS
  69 /*
  70  * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
  71  * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
  72  * those.
  73  */
  74 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  75 #ifdef PPC64_ELF_ABI_v1
  76 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  77 {
  78         /* We need to skip past the initial dot, and the __se_sys alias */
  79         return !strcmp(sym + 1, name) ||
  80                 (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) ||
  81                 (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) ||
  82                 (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) ||
  83                 (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4));
  84 }
  85 #else
  86 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  87 {
  88         return !strcmp(sym, name) ||
  89                 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
  90                 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
  91                 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
  92                 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
  93 }
  94 #endif /* PPC64_ELF_ABI_v1 */
  95 #endif /* CONFIG_FTRACE_SYSCALLS */
  96
  97 #ifdef CONFIG_PPC64
  98 #include <asm/paca.h>
  99
 100 static inline void this_cpu_disable_ftrace(void)
 101 {
 102         get_paca()->ftrace_enabled = 0;
 103 }
 104
 105 static inline void this_cpu_enable_ftrace(void)
 106 {
 107         get_paca()->ftrace_enabled = 1;
 108 }
 109 #else /* CONFIG_PPC64 */
 110 static inline void this_cpu_disable_ftrace(void) { }
 111 static inline void this_cpu_enable_ftrace(void) { }
 112 #endif /* CONFIG_PPC64 */
 113 #endif /* !__ASSEMBLY__ */
 114
 115 #endif /* _ASM_POWERPC_FTRACE */