GAS syntax parsing error
Reported by Pierre Muller | July 5th, 2011 @ 01:55 PM
I am part of core team of Free Pascal compiler.
We do support several assemblers (nams, tasm, GNU as) and I tried to add yasm support using the GNU parser.
Doing so, I found out one parsing bug with
e:\pas\trunk\fpcsrc\compiler\debug>yasm --version
yasm 1.1.0.2352
Compiled on Aug 7 2010.
Copyright (c) 2001-2010 Peter Johnson and other Yasm
developers.
Run yasm --license for licensing overview and summary.
movzwl 0x30(%eax),%eax is wrongly computed as
1e: 0f b6 40 30 movzbl 0x30(%eax),%eax instead of:
1e: 0f b7 40 30 movzwl 0x30(%eax),%eax (correct assembling by GNU
as).
Pierre Muller
Comments and changes to this ticket
-
Pierre Muller July 5th, 2011 @ 02:39 PM
This simple code show the problem:
File test.c .section .text.1 .globl main main:
movzbl 0x30(%eax),%eax movzwl 0x30(%eax),%eaxEnd of file test.c
e:\pas\trunk\fpcsrc\compiler\debug>yasm -f win32 -p gas -o test.o test.s
e:\pas\trunk\fpcsrc\compiler\debug>objdump -D test.o
test.o: file format pe-i386
Disassembly of section .text.1:
00000000 <_main>:
0: 0f b6 40 30 movzbl 0x30(%eax),%eax 4: 0f b6 40 30 movzbl 0x30(%eax),%eax -
-
Peter Johnson July 9th, 2011 @ 07:24 AM
- → Assigned user set to “Peter Johnson”
- → State changed from “new” to “resolved”
Closing since it's ok on HEAD.
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