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authorAnders Kaseorg <andersk@MIT.EDU>2008-10-09 22:19:08 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-14 10:39:29 +0200
commit8b27386a9ce9c7f0f8702cff7565a46802ad57d1 (patch)
treee66efb36314fcb9051881d73aca8c08a80ccafb7 /arch/x86/kernel/ftrace.c
parentbfadadfccc19e36f7d600c5ce7b3e5ba5197fbf0 (diff)
ftrace: make ftrace_test_p6nop disassembler-friendly
Commit 4c3dc21b136f8cb4b72afee16c3ba7e961656c0b in tip introduced the 5-byte NOP ftrace_test_p6nop: jmp . + 5 .byte 0x00, 0x00, 0x00 This is not friendly to disassemblers because an odd number of 0x00s ends in the middle of an instruction boundary. This changes the 0x00s to 1-byte NOPs (0x90). Signed-off-by: Anders Kaseorg <andersk@mit.edu> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/ftrace.c')
-rw-r--r--arch/x86/kernel/ftrace.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 222507e8157..d073d981a73 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -132,7 +132,9 @@ int __init ftrace_dyn_arch_init(void *data)
".section .text, \"ax\"\n"
"ftrace_test_jmp:"
"jmp ftrace_test_p6nop\n"
- ".byte 0x00,0x00,0x00\n" /* 2 byte jmp + 3 bytes */
+ "nop\n"
+ "nop\n"
+ "nop\n" /* 2 byte jmp + 3 bytes */
"ftrace_test_p6nop:"
P6_NOP5
"jmp 1f\n"
@@ -161,7 +163,7 @@ int __init ftrace_dyn_arch_init(void *data)
ftrace_nop = (unsigned long *)ftrace_test_nop5;
break;
case 2:
- pr_info("ftrace: converting mcount calls to jmp 1f\n");
+ pr_info("ftrace: converting mcount calls to jmp . + 5\n");
ftrace_nop = (unsigned long *)ftrace_test_jmp;
break;
}