LXR linux/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__ */
  51extern void _mcount(void);
  52
  53static 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
  59struct 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
  78static 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
  88static 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
 102static inline void this_cpu_disable_ftrace(void)
 103{
 104        get_paca()->ftrace_enabled = 0;
 105}
 106
 107static 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) */
 113static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
 114{
 115        get_paca()->ftrace_enabled = ftrace_enabled;
 116}
 117
 118static inline u8 this_cpu_get_ftrace_enabled(void)
 119{
 120        return get_paca()->ftrace_enabled;
 121}
 122
 123#else /* CONFIG_PPC64 */
 124static inline void this_cpu_disable_ftrace(void) { }
 125static inline void this_cpu_enable_ftrace(void) { }
 126static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
 127static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
 128#endif /* CONFIG_PPC64 */
 129#endif /* !__ASSEMBLY__ */
 130
 131#endif /* _ASM_POWERPC_FTRACE */
 132