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
  51#ifdef CONFIG_DYNAMIC_FTRACE
  52# define FTRACE_ADDR ((unsigned long)ftrace_caller)
  53# define FTRACE_REGS_ADDR FTRACE_ADDR
  54static inline unsigned long ftrace_call_adjust(unsigned long addr)
  55{
  56       /* reloction of mcount call site is the same as the address */
  57       return addr;
  58}
  59
  60struct dyn_arch_ftrace {
  61        struct module *mod;
  62};
  63#endif /*  CONFIG_DYNAMIC_FTRACE */
  64#endif /* __ASSEMBLY__ */
  65
  66#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
  67#define ARCH_SUPPORTS_FTRACE_OPS 1
  68#endif
  69#endif
  70
  71#if defined(CONFIG_FTRACE_SYSCALLS) && !defined(__ASSEMBLY__)
  72#ifdef PPC64_ELF_ABI_v1
  73#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  74static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  75{
  76        /*
  77         * Compare the symbol name with the system call name. Skip the .sys or .SyS
  78         * prefix from the symbol name and the sys prefix from the system call name and
  79         * just match the rest. This is only needed on ppc64 since symbol names on
  80         * 32bit do not start with a period so the generic function will work.
  81         */
  82        return !strcmp(sym + 4, name + 3);
  83}
  84#endif
  85#endif /* CONFIG_FTRACE_SYSCALLS && !__ASSEMBLY__ */
  86
  87#endif /* _ASM_POWERPC_FTRACE */
  88