mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
562955fe6a
Enable x86 to allow for register_ftrace_direct(), where a custom trampoline may be called directly from an ftrace mcount/fentry location. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/* 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_DYNAMIC_FTRACE
|
|
|
|
struct dyn_arch_ftrace {
|
|
/* No extra data needed for x86 */
|
|
};
|
|
|
|
int ftrace_int3_handler(struct pt_regs *regs);
|
|
|
|
#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
|
|
|
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* CONFIG_FUNCTION_TRACER */
|
|
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#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" 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));
|
|
}
|
|
|
|
#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 */
|