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| author | Ian Munsie <imunsie@au.ibm.com> | 2011-02-02 17:27:24 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-05-26 13:38:57 +1000 |
| commit | 02424d8966d803e33cbe51469be56b5d177b4a37 (patch) | |
| tree | 9bf4f118b92c912dc45a2a93a751c18deff4a00c /arch/powerpc/include/asm/ftrace.h | |
| parent | 3f5785ec31adcb7cafa9135087297a38d9698cf8 (diff) | |
| download | linux-02424d8966d803e33cbe51469be56b5d177b4a37.tar.gz linux-02424d8966d803e33cbe51469be56b5d177b4a37.tar.bz2 linux-02424d8966d803e33cbe51469be56b5d177b4a37.zip | |
powerpc/ftrace: Implement raw syscall tracepoints on PowerPC
This patch implements the raw syscall tracepoints on PowerPC and exports
them for ftrace syscalls to use.
To minimise reworking existing code, I slightly re-ordered the thread
info flags such that the new TIF_SYSCALL_TRACEPOINT bit would still fit
within the 16 bits of the andi. instruction's UI field. The instructions
in question are in /arch/powerpc/kernel/entry_{32,64}.S to and the
_TIF_SYSCALL_T_OR_A with the thread flags to see if system call tracing
is enabled.
In the case of 64bit PowerPC, arch_syscall_addr and
arch_syscall_match_sym_name are overridden to allow ftrace syscalls to
work given the unusual system call table structure and symbol names that
start with a period.
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/ftrace.h')
| -rw-r--r-- | arch/powerpc/include/asm/ftrace.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h index dde1296b8b41..169d039ed402 100644 --- a/arch/powerpc/include/asm/ftrace.h +++ b/arch/powerpc/include/asm/ftrace.h @@ -60,4 +60,18 @@ struct dyn_arch_ftrace { #endif +#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_PPC64) && !defined(__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 .sys or .SyS + * prefix from the symbol name and the sys prefix from the system call name and + * just match the rest. This is only needed on ppc64 since symbol names on + * 32bit do not start with a period so the generic function will work. + */ + return !strcmp(sym + 4, name + 3); +} +#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 && !__ASSEMBLY__ */ + #endif /* _ASM_POWERPC_FTRACE */ |