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x86_64 syscall in GAS at&t syntax on OS X
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| .globl start | |
| .cstring | |
| str: | |
| .asciz "Hello World!\n" | |
| str_length: | |
| .set str_lngth, .-str | |
| .text | |
| start: | |
| movq $0x2000004, %rax | |
| movq $1, %rdi | |
| movq str@GOTPCREL(%rip), %rsi | |
| movq str_length@GOTPCREL(%rip), %rdx | |
| syscall | |
| movq $0x2000001, %rax | |
| movq $0, %rdi | |
| syscall |
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