LXR linux/arch/x86/include/asm/ftrace.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_FTRACE_H
   3#define _ASM_X86_FTRACE_H
   4
   5#ifdef CONFIG_FUNCTION_TRACER
   6#ifdef CC_USING_FENTRY
   7# define MCOUNT_ADDR            ((unsigned long)(__fentry__))
   8#else
   9# define MCOUNT_ADDR            ((unsigned long)(mcount))
  10# define HAVE_FUNCTION_GRAPH_FP_TEST
  11#endif
  12#define MCOUNT_INSN_SIZE        5 /* sizeof mcount call */
  13
  14#ifdef CONFIG_DYNAMIC_FTRACE
  15#define ARCH_SUPPORTS_FTRACE_OPS 1
  16#endif
  17
  18#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
  19
  20#ifndef __ASSEMBLY__
  21extern void mcount(void);
  22extern atomic_t modifying_ftrace_code;
  23extern void __fentry__(void);
  24
  25static inline unsigned long ftrace_call_adjust(unsigned long addr)
  26{
  27        /*
  28         * addr is the address of the mcount call instruction.
  29         * recordmcount does the necessary offset calculation.
  30         */
  31        return addr;
  32}
  33
  34#ifdef CONFIG_DYNAMIC_FTRACE
  35
  36struct dyn_arch_ftrace {
  37        /* No extra data needed for x86 */
  38};
  39
  40int ftrace_int3_handler(struct pt_regs *regs);
  41
  42#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
  43
  44#endif /*  CONFIG_DYNAMIC_FTRACE */
  45#endif /* __ASSEMBLY__ */
  46#endif /* CONFIG_FUNCTION_TRACER */
  47
  48
  49#ifndef __ASSEMBLY__
  50
  51#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  52static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  53{
  54        /*
  55         * Compare the symbol name with the system call name. Skip the
  56         * "__x64_sys", "__ia32_sys" or simple "sys" prefix.
  57         */
  58        return !strcmp(sym + 3, name + 3) ||
  59                (!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) ||
  60                (!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3));
  61}
  62
  63#ifndef COMPILE_OFFSETS
  64
  65#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION)
  66#include <linux/compat.h>
  67
  68/*
  69 * Because ia32 syscalls do not map to x86_64 syscall numbers
  70 * this screws up the trace output when tracing a ia32 task.
  71 * Instead of reporting bogus syscalls, just do not trace them.
  72 *
  73 * If the user really wants these, then they should use the
  74 * raw syscall tracepoints with filtering.
  75 */
  76#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 1
  77static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
  78{
  79        return in_32bit_syscall();
  80}
  81#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */
  82#endif /* !COMPILE_OFFSETS */
  83#endif /* !__ASSEMBLY__ */
  84
  85#endif /* _ASM_X86_FTRACE_H */
  86