64位Mac OS X Lion上的nasm / gcc问题 [英] nasm/gcc issue on 64-bit Mac OS X Lion
问题描述
我正在阅读这篇文章,
和有一次,它给了我这个nasm程序:
; tiny.asm
BITS 32
GLOBAL main
SECTION .text
main:
mov eax,42
ret
并告诉我运行以下命令:
$ nasm -f elf tiny.asm
$ gcc -Wall -s tiny.o
ld:warning:选项-s已过时且被忽略
ld :警告:忽略文件tiny.o,文件是为不支持的文件格式构建的,而不是被链接的架构(x86_64)
架构x86_64的未定义符号:
_main,引用来自:
从crt1.10.6.o开始
ld:找不到架构x86_64的符号
collect2:ld返回1退出状态
我冒险猜测可能存在的问题,并将BITS行更改为:
BITS 64
但是当我运行 nasm - flf tiny.asm
我得到:
tiny.asm:2:错误:`64'不是有效的段大小;必须是16或32
如何修改代码以在我的机器上工作?
编辑:
我从评论中拿出了Alex的建议并下载了一个更新的版本。但是,
./ nasm-2.09.10 / nasm -f elf tiny.asm
$ b :错误:elf32输出格式不支持64位代码
另一方面,
./ nasm-2.09.10 / nasm -f elf64 tiny.asm
gcc -Wall -s tiny.o
抱怨
ld:warning:忽略文件tiny.o,文件是针对不支持的文件格式构建的,而不是被链接的架构(x86_64)
架构x86_64的未定义符号:
_main,引用来自:
开始于crt1.10.6.o
ld:架构x86_64未找到符号
collect2:ld返回1退出状态
为了让您的示例正常工作,您必须对OS X进行特定的调整:
主要方法由OS X链接器预置了一个_:
; tiny.asm
BITS 32
GLOBAL _main
SECTION .text
_main:
mov eax,42
ret
第二个是你必须使用mach文件格式:
nasm -f macho tiny.asm
现在您可以将其链接-m32表示一个32位的目标文件):
gcc -m32 tiny.o
I was reading this article, and at one point it gives me this nasm program:
; tiny.asm
BITS 32
GLOBAL main
SECTION .text
main:
mov eax, 42
ret
And tells me to run the following commands:
$ nasm -f elf tiny.asm
$ gcc -Wall -s tiny.o
I got the following error:
ld: warning: option -s is obsolete and being ignored
ld: warning: ignoring file tiny.o, file was built for unsupported file format which is not the architecture being linked (x86_64)
Undefined symbols for architecture x86_64:
"_main", referenced from:
start in crt1.10.6.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
I ventured a guess at what might be the problem, and changed the BITS line to read:
BITS 64
But then when I run nasm -f elf tiny.asm
I get:
tiny.asm:2: error: `64' is not a valid segment size; must be 16 or 32
How do I modify the code to work on my machine?
Edit:
I took Alex's advice from the comments and downloaded a newer version. However,
./nasm-2.09.10/nasm -f elf tiny.asm
complains
tiny.asm:2: error: elf32 output format does not support 64-bit code
On the other hand,
./nasm-2.09.10/nasm -f elf64 tiny.asm
gcc -Wall -s tiny.o
complains
ld: warning: ignoring file tiny.o, file was built for unsupported file format which is not the architecture being linked (x86_64)
Undefined symbols for architecture x86_64:
"_main", referenced from:
start in crt1.10.6.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
There are OS X-specific adjustments you have to make in order for your example to work: The main method is prepended with a _ by the OS X linker:
; tiny.asm
BITS 32
GLOBAL _main
SECTION .text
_main:
mov eax, 42
ret
The second is that you have to use the mach file format:
nasm -f macho tiny.asm
Now you can link it (using -m32 to indicate a 32 bit object file):
gcc -m32 tiny.o
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