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| author | Anders Kaseorg <andersk@MIT.EDU> | 2008-10-09 22:19:08 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-14 10:39:29 +0200 |
| commit | 8b27386a9ce9c7f0f8702cff7565a46802ad57d1 (patch) | |
| tree | e66efb36314fcb9051881d73aca8c08a80ccafb7 /arch | |
| parent | bfadadfccc19e36f7d600c5ce7b3e5ba5197fbf0 (diff) | |
| download | linux-8b27386a9ce9c7f0f8702cff7565a46802ad57d1.tar.gz linux-8b27386a9ce9c7f0f8702cff7565a46802ad57d1.tar.xz | |
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')
| -rw-r--r-- | arch/x86/kernel/ftrace.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index 222507e8157b..d073d981a730 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; } |