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#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__ */
  49extern void _mcount(void);
  50
  51static 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
  57struct 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
  76static 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
  86static 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
 100static inline void this_cpu_disable_ftrace(void)
 101{
 102        get_paca()->ftrace_enabled = 0;
 103}
 104
 105static inline void this_cpu_enable_ftrace(void)
 106{
 107        get_paca()->ftrace_enabled = 1;
 108}
 109#else /* CONFIG_PPC64 */
 110static inline void this_cpu_disable_ftrace(void) { }
 111static inline void this_cpu_enable_ftrace(void) { }
 112#endif /* CONFIG_PPC64 */
 113#endif /* !__ASSEMBLY__ */
 114
 115#endif /* _ASM_POWERPC_FTRACE */
 116