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__
  21 extern void mcount(void);
  22 extern atomic_t modifying_ftrace_code;
  23 extern void __fentry__(void);
  24
  25 static 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
  36 struct dyn_arch_ftrace {
  37         /* No extra data needed for x86 */
  38 };
  39
  40 int 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
  52 static 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
  77 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
  78 {
  79         if (in_compat_syscall())
  80                 return true;
  81         return false;
  82 }
  83 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */
  84 #endif /* !COMPILE_OFFSETS */
  85 #endif /* !__ASSEMBLY__ */
  86
  87 #endif /* _ASM_X86_FTRACE_H */