| Summary: | libgcc: unwind-c.c never uses _Unwind_GetIPInfo | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Florian Weimer <fweimer> |
| Component: | gcc | Assignee: | Jakub Jelinek <jakub> |
| Status: | CLOSED ERRATA | QA Contact: | Michael Petlan <mpetlan> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 7.4 | CC: | ashankar, fweimer, law, mcermak, mnewsome, mpetlan, mpolacek, pfrankli |
| Target Milestone: | rc | Keywords: | Patch |
| Target Release: | --- | ||
| Hardware: | i686 | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | gcc-4.8.5-12.el7 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | 1104812 | Environment: | |
| Last Closed: | 2017-08-01 22:35:59 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Bug Depends On: | 1387400 | ||
| Bug Blocks: | 1390370 | ||
|
Description
Florian Weimer
2016-10-20 19:37:45 UTC
Upstream commit: https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=241491 Hi Florian, could you please advise me how this bug could be tested? Thanks! (In reply to Michael Petlan from comment #4) > Hi Florian, could you please advise me how this bug could be tested? Thanks! I think the only thing you can do is to look at the disassembly of libgcc (objdump -d --reloc) and see if there is a reference to _Unwind_GetIPInfo in the function __gcc_personality_v0. This is from ./obj-x86_64-redhat-linux/x86_64-redhat-linux/32/libgcc/32/libgcc_s.so 000158f0 <__gcc_personality_v0>: 158f0: 55 push %ebp 158f1: b8 03 00 00 00 mov $0x3,%eax 158f6: 57 push %edi 158f7: 56 push %esi 158f8: 53 push %ebx ... [snip] ... 15a10: 89 7c 24 48 mov %edi,0x48(%esp) 15a14: 89 04 24 mov %eax,(%esp) -->15a17: e8 f4 c4 fe ff call 1f10 <_Unwind_GetIPInfo@plt> 15a1c: 83 7c 24 28 01 cmpl $0x1,0x28(%esp) 15a21: 89 c7 mov %eax,%edi 15a23: 83 df 00 sbb $0x0,%edi 15a26: 39 74 24 48 cmp %esi,0x48(%esp) The 64bit libgcc (./obj-x86_64-redhat-linux/x86_64-redhat-linux/libgcc/libgcc_s.so) looks similar: 0000000000011e20 <__gcc_personality_v0>: 11e20: 41 57 push %r15 11e22: b8 03 00 00 00 mov $0x3,%eax 11e27: 41 56 push %r14 11e29: 41 55 push %r13 11e2b: 41 54 push %r12 ... [snip] ... 11f45: 48 89 7c 24 50 mov %rdi,0x50(%rsp) 11f4a: 4c 89 f7 mov %r14,%rdi -->11f4d: e8 1e 0a ff ff callq 2970 <_Unwind_GetIPInfo@plt> 11f52: 83 7c 24 14 01 cmpl $0x1,0x14(%rsp) 11f57: 48 89 c3 mov %rax,%rbx 11f5a: 48 83 db 00 sbb $0x0,%rbx 11f5e: 4c 39 7c 24 50 cmp %r15,0x50(%rsp) (both from gcc-4.8.5-16.el7) When looking at the same thing in gcc-4.8.5-11.el7, I don't see the reference in the same function. --> VERIFIED. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2017:2094 |