如何防止ld添加.note.gnu.property? [英] How do I prevent ld from adding .note.gnu.property?
问题描述
我有一个玩具x86汇编程序，我正在用 as 和 ld 编写和编译:
I've got a toy x86 assembly program that I'm writing and compiling with as and ld:
.text
.global _start
_start:
movq $1, %rax
movq $0x7FFFFFFF, %rbx
L1:
cmp %rbx, %rax
je L2
addq $1, %rax
jmp L1
L2:
movq %rax, %rbx
movq $1, %rax
int $0x80
然后构建:
as -o test.o test.S
ld -s -o test test.o
第二步- ld -产生附加注释:
The second step of this -- ld -- generates an additional note:
$ objdump -D test
test: file format elf64-x86-64
Disassembly of section .note.gnu.property:
00000000004000e8 <.note.gnu.property>:
4000e8: 04 00 add $0x0,%al
4000ea: 00 00 add %al,(%rax)
4000ec: 10 00 adc %al,(%rax)
4000ee: 00 00 add %al,(%rax)
4000f0: 05 00 00 00 47 add $0x47000000,%eax
4000f5: 4e 55 rex.WRX push %rbp
4000f7: 00 01 add %al,(%rcx)
4000f9: 00 00 add %al,(%rax)
4000fb: c0 04 00 00 rolb $0x0,(%rax,%rax,1)
4000ff: 00 01 add %al,(%rcx)
400101: 00 00 add %al,(%rax)
400103: 00 00 add %al,(%rax)
400105: 00 00 add %al,(%rax)
...
Disassembly of section .text:
0000000000401000 <.text>:
401000: 48 c7 c0 01 00 00 00 mov $0x1,%rax
401007: 48 c7 c3 ff ff ff 7f mov $0x7fffffff,%rbx
40100e: 48 39 d8 cmp %rbx,%rax
401011: 74 06 je 0x401019
401013: 48 83 c0 01 add $0x1,%rax
401017: eb f5 jmp 0x40100e
401019: 48 89 c3 mov %rax,%rbx
40101c: 48 c7 c0 01 00 00 00 mov $0x1,%rax
401023: cd 80 int $0x80
是否有消除或阻止生成.note.gnu.property部分的方法?
Is there a way to eliminate or prevent generation of the .note.gnu.property section?
推荐答案
我没有找到传递给ld的直接标志来阻止该节的生成(-s或-s -x都无法工作)，甚至没有调用 strip --strip-all 不会删除此部分，但是， strip --remove-section = .note.gnu.property test 确实删除了该部分:
I didn't find a direct flag to pass to ld to prevent this section's generation (neither -s nor -s -x work), even calling strip --strip-all doesn't remove this section, however, strip --remove-section=.note.gnu.property test did remove the section:
$ as -o test.o test.s
$ ld -o test test.o
$ objdump -D test
test: file format elf64-x86-64
Disassembly of section .note.gnu.property:
00000000004000e8 <.note.gnu.property>:
4000e8: 04 00 add $0x0,%al
4000ea: 00 00 add %al,(%rax)
4000ec: 10 00 adc %al,(%rax)
4000ee: 00 00 add %al,(%rax)
4000f0: 05 00 00 00 47 add $0x47000000,%eax
4000f5: 4e 55 rex.WRX push %rbp
4000f7: 00 01 add %al,(%rcx)
4000f9: 00 00 add %al,(%rax)
4000fb: c0 04 00 00 rolb $0x0,(%rax,%rax,1)
4000ff: 00 01 add %al,(%rcx)
400101: 00 00 add %al,(%rax)
400103: 00 00 add %al,(%rax)
400105: 00 00 add %al,(%rax)
...
Disassembly of section .text:
0000000000401000 <_start>:
401000: 48 c7 c0 01 00 00 00 mov $0x1,%rax
401007: 48 c7 c3 ff ff ff 7f mov $0x7fffffff,%rbx
000000000040100e <L1>:
40100e: 48 39 d8 cmp %rbx,%rax
401011: 74 06 je 401019 <L2>
401013: 48 83 c0 01 add $0x1,%rax
401017: eb f5 jmp 40100e <L1>
0000000000401019 <L2>:
401019: 48 89 c3 mov %rax,%rbx
40101c: 48 c7 c0 01 00 00 00 mov $0x1,%rax
401023: cd 80 int $0x80
$ strip --remove-section=.note.gnu.property test
strip: test: warning: empty loadable segment detected at vaddr=0x400000, is this intentional?
$ objdump -D test
test: file format elf64-x86-64
Disassembly of section .text:
0000000000401000 <.text>:
401000: 48 c7 c0 01 00 00 00 mov $0x1,%rax
401007: 48 c7 c3 ff ff ff 7f mov $0x7fffffff,%rbx
40100e: 48 39 d8 cmp %rbx,%rax
401011: 74 06 je 0x401019
401013: 48 83 c0 01 add $0x1,%rax
401017: eb f5 jmp 0x40100e
401019: 48 89 c3 mov %rax,%rbx
40101c: 48 c7 c0 01 00 00 00 mov $0x1,%rax
401023: cd 80 int $0x80
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