Re: [Qemu-devel] Help with gdb on Mac OS
On 12 févr. 07, at 07:54, Ilya Shar wrote: I am trying to step through i386-darwin-user/qemu-i386 Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_PROTECTION_FAILURE at address: 0x2115eaf5 helper_cmpxchg8b () at ../cpu-all.h:344 344 ((uint32_t *)ptr)[0] = x.p[0]; (gdb) The offending value of ptr is misalligned, can this indicate a problem? Reducing optimization or setting -g3 doesn't change this behavior. Strangely, the same example runs fine without gdb. qemu will handle the signal fine. Actually it is more a feature than a bug ;-) Unfortunately (gdb) handle EXC_BAD_ACCESS pass is kind of broken as EXC_BAD_ACCESS is not translated to the corresponding bsd signal, so qemu won't handle it. You should probably try to use the gdb interface provided by qemu if you wan't to debug the target program instead of qemu: # i386-darwin-user/qemu-i386 -g /bin/ls You can now connect to the gdb interface using: #gdb -arch i386 (gdb) target remote localhost:1234 (gdb) c Pierre. ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
[Qemu-devel] Help with gdb on Mac OS
I am trying to step through i386-darwin-user/qemu-i386 in gdb but I am getting a KERN_PROTECTION_FAILURE fairly early in the run: (gdb) run /bin/ls Starting program: /Users/ilya/tmp/feb11/qemu-0.9.0/i386-darwin-user/qemu-i386 /bin/ls Reading symbols for shared libraries . done Starting /bin/ls with qemu Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_PROTECTION_FAILURE at address: 0x2115eaf5 helper_cmpxchg8b () at ../cpu-all.h:344 344 ((uint32_t *)ptr)[0] = x.p[0]; (gdb) The offending value of ptr is misalligned, can this indicate a problem? Reducing optimization or setting -g3 doesn't change this behavior. Strangely, the same example runs fine without gdb. Is there any way to correct the gdb problem? I am using gdb 6.3 on Mac OS Intel with QEMU 0.9.0 and patches for gcc4/Mac posted by Mike Kronenberg. Thanks for your help, Ilya Be a PS3 game guru. Get your game face on with the latest PS3 news and previews at Yahoo! Games. http://videogames.yahoo.com/platform?platform=120121 ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
