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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>
This commit is contained in:
Naveen N. Rao 2018-05-04 18:44:25 +05:30 committed by Michael Ellerman
parent 0b7758aaf6
commit edf6a2dfe3
1 changed files with 19 additions and 2 deletions
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21
arch/powerpc/include/asm/ftrace.h
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@ -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__ */