使用nasm和ld汇编/链接问题

I have a sample assembly file that I compile with nasm:

我有一个用nasm编译的示例程序集文件:

nasm -f elf syscall.asm

This generates a syscall.o file. I try to link it with ld:

这会生成一个syscall.o文件。我尝试将它与ld链接:

ld -o syscall syscall.o

The ld command fails with the following error:

ld命令失败,并显示以下错误:

ld: i386 architecture of input file `syscall.o' is incompatible with i386:x86-64 output

However, if I do

但是,如果我这样做

ld -o syscall syscall.o -melf_i386

the command succeeds and I get a syscall executable.

命令成功,我得到一个系统调用可执行文件。

Figuring out that nasm is not generating object code in x86-64 format I added "BITS 64" directive to the beginning of the syscall.asm file.

弄清楚nasm没有生成x86-64格式的目标代码我在syscall.asm文件的开头添加了“BITS 64”指令。

Then attempting to assemble syscall.asm with nasm gave the following error:

然后尝试使用nasm组装syscall.asm会出现以下错误:

error: elf output format does not support 64-bit code

That seems strange because doing "file /usr/bin/nasm" on my terminal gives:

这看起来很奇怪,因为在我的终端上执行“file / usr / bin / nasm”会给出:

/usr/bin/nasm: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped

My 64-bit Fedora Core 11 has the latest version of nasm installed and my CPU is Intel Core 2 Duo E7200.

我的64位Fedora Core 11安装了最新版本的nasm,我的CPU是Intel Core 2 Duo E7200。

[EDIT]

My question is how do I get nasm to emit object files that is compatible with i386:x86-64.

我的问题是如何让nasm发出与i386兼容的目标文件:x86-64。

1 个解决方案

#1

Try using elf64 as the output format.

尝试使用elf64作为输出格式。

Example run:

$ cat elf64.asm
section .text
        jmp [rax]
$ nasm -f elf64 elf64.asm
$ objdump -Sr elf64.o

elf64.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <.text>:
   0:   ff 20                   jmpq   *(%rax)

1 个解决方案

#1

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