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authorIan Munsie <imunsie@au.ibm.com>2011-02-02 17:27:24 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-05-26 13:38:57 +1000
commit02424d8966d803e33cbe51469be56b5d177b4a37 (patch)
tree9bf4f118b92c912dc45a2a93a751c18deff4a00c /arch/powerpc/include/asm/syscall.h
parent3f5785ec31adcb7cafa9135087297a38d9698cf8 (diff)
downloadop-kernel-dev-02424d8966d803e33cbe51469be56b5d177b4a37.zip
op-kernel-dev-02424d8966d803e33cbe51469be56b5d177b4a37.tar.gz
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/syscall.h')
-rw-r--r--arch/powerpc/include/asm/syscall.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/syscall.h b/arch/powerpc/include/asm/syscall.h
index 23913e9..b54b2ad 100644
--- a/arch/powerpc/include/asm/syscall.h
+++ b/arch/powerpc/include/asm/syscall.h
@@ -15,6 +15,11 @@
#include <linux/sched.h>
+/* ftrace syscalls requires exporting the sys_call_table */
+#ifdef CONFIG_FTRACE_SYSCALLS
+extern const unsigned long *sys_call_table;
+#endif /* CONFIG_FTRACE_SYSCALLS */
+
static inline long syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
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