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authorIan Munsie <imunsie@au1.ibm.com>2011-02-03 14:27:23 +1100
committerSteven Rostedt <rostedt@goodmis.org>2011-02-07 21:29:03 -0500
commitb2d55496818d64310b9f5486d4eea76ea614d7f8 (patch)
treeb31ea491ae7d02c6375457fa3269fa0289fd8fb4 /kernel/trace
parentc763ba06bd9b5db2c46c36276c89103d92d2c604 (diff)
downloadop-kernel-dev-b2d55496818d64310b9f5486d4eea76ea614d7f8.zip
op-kernel-dev-b2d55496818d64310b9f5486d4eea76ea614d7f8.tar.gz
tracing/syscalls: Allow arch specific syscall symbol matching
Some architectures have unusual symbol names and the generic code to match the symbol name with the function name for the syscall metadata will fail. For example, symbols on PPC64 start with a period and the generic code will fail to match them. This patch moves the match logic out into a separate function which an arch can override by defining ARCH_HAS_SYSCALL_MATCH_SYM_NAME in asm/ftrace.h and implementing arch_syscall_match_sym_name. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> LKML-Reference: <1296703645-18718-5-git-send-email-imunsie@au1.ibm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_syscalls.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index af83154..86a23e7 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -60,6 +60,19 @@ extern struct syscall_metadata *__stop_syscalls_metadata[];
static struct syscall_metadata **syscalls_metadata;
+#ifndef ARCH_HAS_SYSCALL_MATCH_SYM_NAME
+static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
+{
+ /*
+ * Only compare after the "sys" prefix. Archs that use
+ * syscall wrappers may have syscalls symbols aliases prefixed
+ * with "SyS" instead of "sys", leading to an unwanted
+ * mismatch.
+ */
+ return !strcmp(sym + 3, name + 3);
+}
+#endif
+
static __init struct syscall_metadata *
find_syscall_meta(unsigned long syscall)
{
@@ -73,13 +86,7 @@ find_syscall_meta(unsigned long syscall)
kallsyms_lookup(syscall, NULL, NULL, NULL, str);
for ( ; start < stop; start++) {
- /*
- * Only compare after the "sys" prefix. Archs that use
- * syscall wrappers may have syscalls symbols aliases prefixed
- * with "SyS" instead of "sys", leading to an unwanted
- * mismatch.
- */
- if ((*start)->name && !strcmp((*start)->name + 3, str + 3))
+ if ((*start)->name && arch_syscall_match_sym_name(str, (*start)->name))
return *start;
}
return NULL;
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