https://sourceware.org/bugzilla/show_bug.cgi?id=29038
Bug ID: 29038
Summary: Debug info for function in Windows PE binary on wrong
instruction
Product: binutils
Version: 2.39 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: charlespigott at googlemail dot com
Target Milestone: ---
Compiling the following code:
```
void leaf1 (void) { }
int main (void)
{
return 0;
}
```
with gcc (8.3.0) on Windows (MinGW) with debug symbols (`gcc contexts.c -g -o
roca.exe`) results in the following output from `objdump -dl roca.exe` :
```
C:\Users\cpigott\dev/contexts/contexts.c:1
40154f: 90 nop
00401550 :
401550: 55 push %rbp
401551: 48 89 e5mov%rsp,%rbp
401554: 90 nop
401555: 5d pop%rbp
401556: c3 retq
```
with the debug info being attached to the instruction before the start of the
function, rather than the expected:
```
00401550 :
C:\Users\cpigott\dev/contexts/contexts.c:1
401550: 55 push %rbp
401551: 48 89 e5mov%rsp,%rbp
401554: 90 nop
401555: 5d pop%rbp
401556: c3 retq
```
Some git bisecting suggests this to be the first bad commit:
commit e643cb45bf85fa5c8c49a89ff177de246af4212e (HEAD, refs/bisect/bad)
Author: Nick Clifton
Date: Wed Mar 29 12:27:44 2017 +0100
Improve the speed of scanning PE binaries for line number information.
PR binutils/18025
* coff-bfd.h (struct coff_section_data): Add new fields:
saved_bias and bias.
* coffgen.c (coff_find_nearest_line_with_names): Cache the bias
computed for PE binaries.
* dwarf2.c (scan_unit_for_symbols): Only warn once about each
missing abbrev.
Which looks suitably suspicious.
Only the first function in each file (including C runtime) is affected, all
subsequent functions are fine.
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