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 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
  12
  13 #ifdef __ASSEMBLY__
  14
  15 /* Based off of objdump output from glibc */
  16
  17 #define MCOUNT_SAVE_FRAME                       \
  18         stwu    r1,-48(r1);                     \
  19         stw     r3, 12(r1);                     \
  20         stw     r4, 16(r1);                     \
  21         stw     r5, 20(r1);                     \
  22         stw     r6, 24(r1);                     \
  23         mflr    r3;                             \
  24         lwz     r4, 52(r1);                     \
  25         mfcr    r5;                             \
  26         stw     r7, 28(r1);                     \
  27         stw     r8, 32(r1);                     \
  28         stw     r9, 36(r1);                     \
  29         stw     r10,40(r1);                     \
  30         stw     r3, 44(r1);                     \
  31         stw     r5, 8(r1)
  32
  33 #define MCOUNT_RESTORE_FRAME                    \
  34         lwz     r6, 8(r1);                      \
  35         lwz     r0, 44(r1);                     \
  36         lwz     r3, 12(r1);                     \
  37         mtctr   r0;                             \
  38         lwz     r4, 16(r1);                     \
  39         mtcr    r6;                             \
  40         lwz     r5, 20(r1);                     \
  41         lwz     r6, 24(r1);                     \
  42         lwz     r0, 52(r1);                     \
  43         lwz     r7, 28(r1);                     \
  44         lwz     r8, 32(r1);                     \
  45         mtlr    r0;                             \
  46         lwz     r9, 36(r1);                     \
  47         lwz     r10,40(r1);                     \
  48         addi    r1, r1, 48
  49
  50 #else /* !__ASSEMBLY__ */
  51 extern void _mcount(void);
  52
  53 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  54 {
  55        /* relocation 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 /* __ASSEMBLY__ */
  63
  64 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
  65 #define ARCH_SUPPORTS_FTRACE_OPS 1
  66 #endif
  67 #endif /* CONFIG_FUNCTION_TRACER */
  68
  69 #ifndef __ASSEMBLY__
  70 #ifdef CONFIG_FTRACE_SYSCALLS
  71 /*
  72  * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
  73  * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
  74  * those.
  75  */
  76 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  77 #ifdef PPC64_ELF_ABI_v1
  78 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  79 {
  80         /* We need to skip past the initial dot, and the __se_sys alias */
  81         return !strcmp(sym + 1, name) ||
  82                 (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) ||
  83                 (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) ||
  84                 (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) ||
  85                 (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4));
  86 }
  87 #else
  88 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  89 {
  90         return !strcmp(sym, name) ||
  91                 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
  92                 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
  93                 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
  94                 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
  95 }
  96 #endif /* PPC64_ELF_ABI_v1 */
  97 #endif /* CONFIG_FTRACE_SYSCALLS */
  98
  99 #ifdef CONFIG_PPC64
 100 #include <asm/paca.h>
 101
 102 static inline void this_cpu_disable_ftrace(void)
 103 {
 104         get_paca()->ftrace_enabled = 0;
 105 }
 106
 107 static inline void this_cpu_enable_ftrace(void)
 108 {
 109         get_paca()->ftrace_enabled = 1;
 110 }
 111
 112 /* Disable ftrace on this CPU if possible (may not be implemented) */
 113 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
 114 {
 115         get_paca()->ftrace_enabled = ftrace_enabled;
 116 }
 117
 118 static inline u8 this_cpu_get_ftrace_enabled(void)
 119 {
 120         return get_paca()->ftrace_enabled;
 121 }
 122
 123 #else /* CONFIG_PPC64 */
 124 static inline void this_cpu_disable_ftrace(void) { }
 125 static inline void this_cpu_enable_ftrace(void) { }
 126 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
 127 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
 128 #endif /* CONFIG_PPC64 */
 129 #endif /* !__ASSEMBLY__ */
 130
 131 #endif /* _ASM_POWERPC_FTRACE */