Bug 181390
| Summary: | cannot examine stack from non-$esp register in 32-bit mode | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | John Reiser <jreiser> |
| Component: | gdb | Assignee: | Jan Kratochvil <jan.kratochvil> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 5 | CC: | cagney, jan.kratochvil, sundaram |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | gdb-6.5-13.fc6 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2007-01-27 11:19:34 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
These bugs are being closed since a large number of updates have been released after the FC5 test1 and test2 releases. Kindly update your system by running yum update as root user or try out the third and final test version of FC5 being released in a short while and verify if the bugs are still present on the system .Reopen or file new bug reports as appropriate after confirming the presence of this issue. Thanks To be fixed in gdb-6.5-11.fc6, thanks for your bugreport. gdb-6.5-13.fc6 has been pushed for fc6, which should resolve this issue. If these problems are still present in this version, then please make note of it in this bug report. Formal mistake, state MODIFIED is invalid for FC bugs. |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8) Gecko/20060126 Fedora/1.5-5 Firefox/1.5 Description of problem: When debugging a 32-bit executable on x86_64, gdb does not allow examining the stack if pointed to by a non-$esp register. For example, -----foo.S _start: .globl _start nop int3 movl %esp,%ebx int3 # examining memory from $ebx fails, from $esp succeeds nop nop ----- $ gcc -m32 -o foo -nostartfiles -nostdlib foo.S $ gdb foo Version-Release number of selected component (if applicable): gdb-6.3.0.0-1.98.2 How reproducible: Always Steps to Reproduce: 1. Build and debug the 32-bit test program in the Description. 2. Examine memory from $esp then from $ebx with the same value. 3. Actual Results: (gdb) run Starting program: /home/jreiser/foo Reading symbols from shared object read from target memory...(no debugging symbols found)...done. Loaded system supplied DSO at 0xffffe000 Program received signal SIGTRAP, Trace/breakpoint trap. 0x08048076 in _start () (gdb) x/i $pc 0x8048076 <_start+2>: mov %esp,%ebx (gdb) stepi 0x08048078 in _start () (gdb) x/x $esp 0xffffce70: 0x00000001 (gdb) x/x $ebx 0xffffce70: Cannot access memory at address 0xffffce70 (gdb) x/x 0xffffce70 0xffffce70: 0x00000001 Expected Results: "x/x $ebx" should have succeeded, too, when %ebx has the same value as %esp and examining from $esp works. Additional info: Workaround apears to be: print the register, then use the contents as a literal address to examine.