diff options
| 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/kernel/ftrace.c | |
| parent | 3f5785ec31adcb7cafa9135087297a38d9698cf8 (diff) | |
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/kernel/ftrace.c')
| -rw-r--r-- | arch/powerpc/kernel/ftrace.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c index ce1f3e44c24..bf99cfa6bbf 100644 --- a/arch/powerpc/kernel/ftrace.c +++ b/arch/powerpc/kernel/ftrace.c @@ -22,6 +22,7 @@ #include <asm/cacheflush.h> #include <asm/code-patching.h> #include <asm/ftrace.h> +#include <asm/syscall.h> #ifdef CONFIG_DYNAMIC_FTRACE @@ -600,3 +601,10 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) } } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ + +#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_PPC64) +unsigned long __init arch_syscall_addr(int nr) +{ + return sys_call_table[nr*2]; +} +#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 */ |