Here is the output of objdump -d firefox-4.0-bin with gcc4.4 and -pie
The major difference is with how pthread_mutex_lock is called in malloc:
937d: 8b 4d e4 mov -0x1c(%ebp),%ecx
9380: 89 0c 24 mov %ecx,(%esp)
9383: e8 28 7f ff ff call 12b0 <pthread_mutex_l...@plt>
....the value loaded on to the stack comes from earlier, here:
92f8: 65 a1 00 00 00 00 mov %gs:0x0,%eax
92fe: 81 e8 04 00 00 00 sub $0x4,%eax
9304: 8b 00 mov (%eax),%eax
9306: 85 c0 test %eax,%eax
9308: 89 45 e4 mov %eax,-0x1c(%ebp)
...note that the lea instruction has been replaced with a sub, and now
loads the contents of the correct address in to eax
** Attachment added: "firefox-4.0-bin-4.4"
https://bugs.launchpad.net/ubuntu/+source/gcc-4.5/+bug/663294/+attachment/1721188/+files/firefox-4.0-bin-4.4
** Summary changed:
- Firefox built with gcc-4.5 is a non-starter on i386
+ Firefox built with gcc-4.5 is a non-starter on i386 with -pie
--
Firefox built with gcc-4.5 is a non-starter on i386 with -pie
https://bugs.launchpad.net/bugs/663294
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