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Merge pull request #250 from Shark64/master

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Reduce object-code size for nasm_linux.asm
This commit is contained in:
Mike Donaghy
2016-01-15 01:27:17 -05:00
parent 96d0a237f1 2a6a28811d
commit d0512a548a
1 changed files with 10 additions and 8 deletions
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18
a/assembler_nasm_linux.asm
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@@ -3,16 +3,18 @@ section .text
_start: ;tell linker entry point _start: ;tell linker entry point
mov edx,len ;message length xor ebx,ebx ;ebx=0
mov ecx,msg ;message to write mov ecx,msg ;address of message to write
mov ebx,1 ;file descriptor (stdout) lea edx,[ebx+len] ;message length
mov eax,4 ;system call number (sys_write) lea eax,[ebx+4] ;system call number (sys_write)
int 0x80 ;call kernel inc ebx ;file descriptor (stdout)
int 0x80 ;call kernel
mov eax,1 ;system call number (sys_exit) xor eax, eax ;set eax=0
int 0x80 ;call kernel inc eax ;system call number (sys_exit)
int 0x80 ;call kernel
section .data section .rodata
msg db 'Hello, world!',0xa ;our string msg db 'Hello, world!',0xa ;our string
len equ $ - msg ;length of our string len equ $ - msg ;length of our string