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| author | Bibo Mao <maobibo@loongson.cn> | 2020-06-09 05:54:35 +0300 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2025-02-21 19:46:30 +0300 |
| commit | 756276ce78d5624dc814f9d99f7d16c8fd51076e (patch) | |
| tree | b44760f0ccaf9de41b77466350beda5da8b5d23e /arch/mips/include | |
| parent | 5ae16e22b0a04123dc95e0ce9b251fd953bdd0c6 (diff) | |
| download | linux-756276ce78d5624dc814f9d99f7d16c8fd51076e.tar.xz | |
MIPS: Use arch specific syscall name match function
On MIPS system, most of the syscall function name begin with prefix
sys_. Some syscalls are special such as clone/fork, function name of
these begin with __sys_. Since scratch registers need be saved in
stack when these system calls happens.
With ftrace system call method, system call functions are declared with
SYSCALL_DEFINEx, metadata of the system call symbol name begins with
sys_. Here mips specific function arch_syscall_match_sym_name is used to
compare function name between sys_call_table[] and metadata of syscall
symbol.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/include')
| -rw-r--r-- | arch/mips/include/asm/ftrace.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/mips/include/asm/ftrace.h b/arch/mips/include/asm/ftrace.h index dc025888f6d2..b41fc1044668 100644 --- a/arch/mips/include/asm/ftrace.h +++ b/arch/mips/include/asm/ftrace.h @@ -91,4 +91,20 @@ void prepare_ftrace_return(unsigned long *parent_ra_addr, unsigned long self_ra, #endif /* __ASSEMBLY__ */ #endif /* CONFIG_FUNCTION_TRACER */ + +#ifdef CONFIG_FTRACE_SYSCALLS +#ifndef __ASSEMBLY__ +/* + * Some syscall entry functions on mips start with "__sys_" (fork and clone, + * for instance). We should also match the sys_ variant with those. + */ +#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME +static inline bool arch_syscall_match_sym_name(const char *sym, + const char *name) +{ + return !strcmp(sym, name) || + (!strncmp(sym, "__sys_", 6) && !strcmp(sym + 6, name + 4)); +} +#endif /* __ASSEMBLY__ */ +#endif /* CONFIG_FTRACE_SYSCALLS */ #endif /* _ASM_MIPS_FTRACE_H */ |