http://sourceware.org/bugzilla/show_bug.cgi?id=12687
Summary: Incorrect jump address for backward local labels with
Intel syntax
Product: binutils
Version: 2.22 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
AssignedTo: unassig...@sources.redhat.com
ReportedBy: m8r-oq0...@mailinator.com
Created attachment 5679
--> http://sourceware.org/bugzilla/attachment.cgi?id=5679
A test for backward local labels with Intel syntax
File test.asm:
.intel_syntax
mov eax, 5
1:
dec eax
jnz 1b
ret
Command line (under MinGW):
as test.asm -o test.o
ld test.o -o test.exe
Actual result: jump two bytes forward.
00401000 B8 05000000 mov eax,5
00401005 48 dec eax
00401006 +--- 75 02 jne short test.0040100A ; error
00401008 | C3 ret
00401009 | 90 nop
0040100A +-> 90 nop
Expected result: jump three bytes back:
00401000 B8 05000000 mov eax,5
00401005 +-> 48 dec eax
00401006 +--- 75 FD jne short test.00401005
00401008 C3 ret
Additional information
If you specify -a switch (as test.asm -o test.o -a), the bug disappears. If you
rewrite the assembly code using AT&T syntax, it also disappears:
mov $5, %eax
1:
dec %eax
jnz 1b
ret
I checked the object file (test.o) generated by the GNU Assembler and found the
erroneous jump address in it (so it's not a linker bug).
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