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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_FTRACE_H
#define _ASM_X86_FTRACE_H
#ifdef CONFIG_FUNCTION_TRACER
#ifndef CC_USING_FENTRY
# error Compiler does not support fentry?
#endif
# define MCOUNT_ADDR ((unsigned long)(__fentry__))
#define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */
#ifdef CONFIG_DYNAMIC_FTRACE
#define ARCH_SUPPORTS_FTRACE_OPS 1
#endif
#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
#ifndef __ASSEMBLY__
extern atomic_t modifying_ftrace_code;
extern void __fentry__(void);
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
/*
* addr is the address of the mcount call instruction.
* recordmcount does the necessary offset calculation.
*/
return addr;
}
/*
* When a ftrace registered caller is tracing a function that is
* also set by a register_ftrace_direct() call, it needs to be
* differentiated in the ftrace_caller trampoline. To do this, we
* place the direct caller in the ORIG_AX part of pt_regs. This
* tells the ftrace_caller that there's a direct caller.
*/
static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr)
{
/* Emulate a call */
regs->orig_ax = addr;
}
#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
struct ftrace_regs {
struct pt_regs regs;
};
static __always_inline struct pt_regs *
arch_ftrace_get_regs(struct ftrace_regs *fregs)
{
/* Only when FL_SAVE_REGS is set, cs will be non zero */
if (!fregs->regs.cs)
return NULL;
return &fregs->regs;
}
#define ftrace_instruction_pointer_set(fregs, _ip) \
do { (fregs)->regs.ip = (_ip); } while (0)
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
struct dyn_arch_ftrace {
/* No extra data needed for x86 */
};
#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_FUNCTION_TRACER */
#ifndef __ASSEMBLY__
#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
extern void set_ftrace_ops_ro(void);
#else
static inline void set_ftrace_ops_ro(void) { }
#endif
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
{
/*
* Compare the symbol name with the system call name. Skip the
* "__x64_sys", "__ia32_sys", "__do_sys" or simple "sys" prefix.
*/
return !strcmp(sym + 3, name + 3) ||
(!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) ||
(!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3)) ||
(!strncmp(sym, "__do_sys", 8) && !strcmp(sym + 8, name + 3));
}
#ifndef COMPILE_OFFSETS
#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION)
#include <linux/compat.h>
/*
* Because ia32 syscalls do not map to x86_64 syscall numbers
* this screws up the trace output when tracing a ia32 task.
* Instead of reporting bogus syscalls, just do not trace them.
*
* If the user really wants these, then they should use the
* raw syscall tracepoints with filtering.
*/
#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 1
static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
{
return in_32bit_syscall();
}
#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */
#endif /* !COMPILE_OFFSETS */
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_X86_FTRACE_H */
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