http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55289
--- Comment #11 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-11-13
20:13:18 UTC ---
For the simple test case...
int main()
{
int i;
i=5;
}
compiled with 'g++-fsf-4.8 -faddress-sanitizer -O0 -framework CoreFoundation
test.cc -lasan'
using a mach_override.c with...
#define DEBUG_DISASM 1
// #undef DEBUG_DISASM
the errors appear late in the debug output at...
Replacing function at 0x11183d630
First 16 bytes of the function: 48 8d 5 11 4f b 0 53 48 8d 5f e0 48 89 77 90
To disassemble, save the following function as disas.c and run:
gcc -c disas.c && gobjdump -d disas.o
The first 16 bytes of the original function will start after four nop
instructions.
void foo() {
asm volatile("nop;nop;nop;nop;");
asm volatile(".byte 0x48, 0x8d, 0x5, 0x11, 0x4f, 0xb, 0x0, 0x53;");
asm volatile(".byte 0x48, 0x8d, 0x5f, 0xe0, 0x48, 0x89, 0x77, 0x90;");
}
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 8d FAIL
Matching: 48 8d FAIL
Matching: 48 8d FAIL
Matching: 48 8d FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 8d FAIL
Matching: 48 8d FAIL
Matching: 48 FAIL
Matching: 48 8d FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 FAIL
Matching: 48 8d FAIL
mach_override: some instructions unknown! Need to update mach_override.c
overridePossible = false @299
err = f8000001
../../../../gcc-4.8-20121113/libsanitizer/interception/mach_override/mach_override.c:308
err = f8000001
../../../../gcc-4.8-20121113/libsanitizer/interception/mach_override/mach_override.c:321
err = f8000001
../../../../gcc-4.8-20121113/libsanitizer/interception/mach_override/mach_override.c:327
err = f8000001
../../../../gcc-4.8-20121113/libsanitizer/interception/mach_override/mach_override.c:340
err = f8000001
../../../../gcc-4.8-20121113/libsanitizer/interception/mach_override/mach_override.c:345
First 16 bytes of the function after slicing: 48 8d 5 11 4f b 0 53 48 8d 5f e0
48 89 77 90
Replacing function at 0x7fff94c23364
