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#ifndef CC_USING_FENTRY
   7# error Compiler does not support fentry?
   8#endif
   9# define MCOUNT_ADDR            ((unsigned long)(__fentry__))
  10#define MCOUNT_INSN_SIZE        5 /* sizeof mcount call */
  11
  12#ifdef CONFIG_DYNAMIC_FTRACE
  13#define ARCH_SUPPORTS_FTRACE_OPS 1
  14#endif
  15
  16#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
  17
  18#ifndef __ASSEMBLY__
  19extern atomic_t modifying_ftrace_code;
  20extern void __fentry__(void);
  21
  22static inline unsigned long ftrace_call_adjust(unsigned long addr)
  23{
  24        /*
  25         * addr is the address of the mcount call instruction.
  26         * recordmcount does the necessary offset calculation.
  27         */
  28        return addr;
  29}
  30
  31/*
  32 * When a ftrace registered caller is tracing a function that is
  33 * also set by a register_ftrace_direct() call, it needs to be
  34 * differentiated in the ftrace_caller trampoline. To do this, we
  35 * place the direct caller in the ORIG_AX part of pt_regs. This
  36 * tells the ftrace_caller that there's a direct caller.
  37 */
  38static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr)
  39{
  40        /* Emulate a call */
  41        regs->orig_ax = addr;
  42}
  43
  44#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
  45struct ftrace_regs {
  46        struct pt_regs          regs;
  47};
  48
  49static __always_inline struct pt_regs *
  50arch_ftrace_get_regs(struct ftrace_regs *fregs)
  51{
  52        /* Only when FL_SAVE_REGS is set, cs will be non zero */
  53        if (!fregs->regs.cs)
  54                return NULL;
  55        return &fregs->regs;
  56}
  57
  58#define ftrace_instruction_pointer_set(fregs, _ip)      \
  59        do { (fregs)->regs.ip = (_ip); } while (0)
  60#endif
  61
  62#ifdef CONFIG_DYNAMIC_FTRACE
  63
  64struct dyn_arch_ftrace {
  65        /* No extra data needed for x86 */
  66};
  67
  68#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
  69
  70#endif /*  CONFIG_DYNAMIC_FTRACE */
  71#endif /* __ASSEMBLY__ */
  72#endif /* CONFIG_FUNCTION_TRACER */
  73
  74
  75#ifndef __ASSEMBLY__
  76
  77#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
  78extern void set_ftrace_ops_ro(void);
  79#else
  80static inline void set_ftrace_ops_ro(void) { }
  81#endif
  82
  83#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  84static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  85{
  86        /*
  87         * Compare the symbol name with the system call name. Skip the
  88         * "__x64_sys", "__ia32_sys", "__do_sys" or simple "sys" prefix.
  89         */
  90        return !strcmp(sym + 3, name + 3) ||
  91                (!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) ||
  92                (!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3)) ||
  93                (!strncmp(sym, "__do_sys", 8) && !strcmp(sym + 8, name + 3));
  94}
  95
  96#ifndef COMPILE_OFFSETS
  97
  98#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION)
  99#include <linux/compat.h>
 100
 101/*
 102 * Because ia32 syscalls do not map to x86_64 syscall numbers
 103 * this screws up the trace output when tracing a ia32 task.
 104 * Instead of reporting bogus syscalls, just do not trace them.
 105 *
 106 * If the user really wants these, then they should use the
 107 * raw syscall tracepoints with filtering.
 108 */
 109#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 1
 110static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
 111{
 112        return in_32bit_syscall();
 113}
 114#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */
 115#endif /* !COMPILE_OFFSETS */
 116#endif /* !__ASSEMBLY__ */
 117
 118#endif /* _ASM_X86_FTRACE_H */
 119