我终于开始重拾我的colorforth项目了,几年前由于binutils的更新导致所有源代码失效而放弃了它。这里有一个示例来说明正在发生的事情:
jcomeau@aspire:~$ cat /tmp/test.as
.intel_syntax
.arch i386
.code32
mov eax,[foo + eax*4]
lea ecx,[ecx*4+0x9e0]
mov edx,DWORD PTR [edi*4-0x4]
jmp DWORD PTR [ecx*4+0x12cc]
lea edx,[ecx+edx*1]
第一条非指令行来自手册中的示例:https://sourceware.org/binutils/docs/as/i386_002dMemory.html#i386_002dMemory,其余部分来自带有--disassembler-options=intel
标志的objdump反汇编。每一条都无法汇编:
jcomeau@aspire:~$ as /tmp/test.as
/tmp/test.as: Assembler messages:
/tmp/test.as:4: Error: too many memory references for `mov'
/tmp/test.as:5: Error: too many memory references for `lea'
/tmp/test.as:6: Error: too many memory references for `mov'
/tmp/test.as:8: Error: too many memory references for `lea'
/tmp/test.as:7: Error: invalid operands (*UND* and *ABS* sections) for `*'
整晚我一直在谷歌搜索,但没有找到任何结果。我确定我做错了什么,但是我真的搞不清楚问题出在哪里。我已经apt-get source binutils
了,但不知道从哪里开始查找。
jcomeau@aspire:~$ as --version
GNU assembler (GNU Binutils for Debian) 2.25.90.20151209
Copyright (C) 2015 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `i686-linux-gnu'.
那么,重新开始使用 gas
的魔法咒语是什么?
.intel_syntax noprefix
。如果您不使用noprefix
,GAS仍然希望寄存器名称以%
(百分号)为前缀,这似乎是您问题的原因。 - Michael Petch