/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_FTRACE_H
#define _ASM_X86_FTRACE_H
#include <asm /ptrace.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 */
/* Ignore unused weak functions which will have non zero offsets */
#ifdef CONFIG_HAVE_FENTRY
# include <asm /ibt.h>
/* Add offset for endbr64 if IBT enabled */
# define FTRACE_MCOUNT_MAX_OFFSET ENDBR_INSN_SIZE
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
#define ARCH_SUPPORTS_FTRACE_OPS 1
#endif
#ifndef __ASSEMBLER__
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;
}
static inline unsigned long arch_ftrace_get_symaddr(unsigned long fentry_ip)
{
if (is_endbr((void *)(fentry_ip - ENDBR_INSN_SIZE)))
fentry_ip -= ENDBR_INSN_SIZE;
return fentry_ip;
}
#define ftrace_get_symaddr(fentry_ip) arch_ftrace_get_symaddr(fentry_ip)
#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
#include <linux/ftrace_regs.h>
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 (!arch_ftrace_regs(fregs)->regs.cs)
return NULL;
return &arch_ftrace_regs(fregs)->regs;
}
#define arch_ftrace_fill_perf_regs(fregs, _regs) do { \
(_regs)->ip = arch_ftrace_regs(fregs)->regs.ip; \
(_regs)->sp = arch_ftrace_regs(fregs)->regs.sp; \
(_regs)->cs = __KERNEL_CS; \
(_regs)->flags = 0 ; \
} while (0 )
#define ftrace_regs_set_instruction_pointer(fregs, _ip) \
do { arch_ftrace_regs(fregs)->regs.ip = (_ip); } while (0 )
static __always_inline unsigned long
ftrace_regs_get_return_address(struct ftrace_regs *fregs)
{
return *(unsigned long *)ftrace_regs_get_stack_pointer(fregs);
}
struct ftrace_ops;
#define ftrace_graph_func ftrace_graph_func
void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct ftrace_regs *fregs);
#else
#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
#endif
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
/*
* 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;
}
#define arch_ftrace_set_direct_caller(fregs, addr) \
__arch_ftrace_set_direct_caller(&arch_ftrace_regs(fregs)->regs, addr)
#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
#ifdef CONFIG_DYNAMIC_FTRACE
struct dyn_arch_ftrace {
/* No extra data needed for x86 */
};
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLER__ */
#endif /* CONFIG_FUNCTION_TRACER */
#ifndef __ASSEMBLER__
void prepare_ftrace_return(unsigned long ip, unsigned long *parent,
unsigned long frame_pointer);
#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 /* !__ASSEMBLER__ */
#endif /* _ASM_X86_FTRACE_H */
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