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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2018-05-04 15:14:25 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-05-07 13:29:44 +0200 |
| commit | edf6a2dfe3889daf97e7c164891a87832169e3e4 (patch) | |
| tree | 5a2c0267edaa623f4d875001d0609cd187f5ca01 /arch/powerpc/include/asm | |
| parent | powerpc/trace/syscalls: Update syscall name matching logic (diff) | |
| download | linux-edf6a2dfe3889daf97e7c164891a87832169e3e4.tar.xz linux-edf6a2dfe3889daf97e7c164891a87832169e3e4.zip | |
powerpc/trace/syscalls: Update syscall name matching logic to account for ppc_ prefix
Some syscall entry functions on powerpc are prefixed with
ppc_/ppc32_/ppc64_ rather than the usual sys_/__se_sys prefix. fork(),
clone(), swapcontext() are some examples of syscalls with such entry
points. We need to match against these names when initializing ftrace
syscall tracing.
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm')
| -rw-r--r-- | arch/powerpc/include/asm/ftrace.h | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h index 24103fa57b54..b2dabd06659d 100644 --- a/arch/powerpc/include/asm/ftrace.h +++ b/arch/powerpc/include/asm/ftrace.h @@ -69,13 +69,30 @@ struct dyn_arch_ftrace { #endif #if defined(CONFIG_FTRACE_SYSCALLS) && !defined(__ASSEMBLY__) -#ifdef PPC64_ELF_ABI_v1 +/* + * Some syscall entry functions on powerpc start with "ppc_" (fork and clone, + * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with + * those. + */ #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME +#ifdef PPC64_ELF_ABI_v1 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) { /* We need to skip past the initial dot, and the __se_sys alias */ return !strcmp(sym + 1, name) || - (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)); + (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) || + (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) || + (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) || + (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4)); +} +#else +static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) +{ + return !strcmp(sym, name) || + (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) || + (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) || + (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) || + (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4)); } #endif #endif /* CONFIG_FTRACE_SYSCALLS && !__ASSEMBLY__ */ |