81 lines
961 B
ArmAsm
81 lines
961 B
ArmAsm
.globl _start
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.type _start, @function
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.globl entry
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.type entry, @function
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_start:
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#mov -4(%ebp),%eax
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pop %rax
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mov %rax,argc(%rip)
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mov %rax,%rdi
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pop %rax
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mov %rax,argv(%rip)
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cmp $1,%rdi
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jg endif
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mov $1,%rdi
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call usage
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jmp _exit
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endif:
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mov $0,%rdi
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jmp _exit
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usage:
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lea help0(%rip),%rdi
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mov $help0l,%rsi
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call write
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mov argv(%rip),%rdi
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push %rdi
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call strlen
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pop %rdi
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mov %rax,%rsi
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call write
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lea help1(%rip),%rdi
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mov $help1l,%rsi
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call write
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ret
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# rdi - buf
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# -> rax - len
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strlen:
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mov %rdi,%rsi
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xor %rax,%rax
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repne scasb
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sub %rsi,%rdi
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mov %rdi,%rax
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ret
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# rdi - buf
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# rsi - len
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write:
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push %rdi
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push %rsi
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pop %rdx
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pop %rsi
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mov $1,%rax
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mov $1,%rdi
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syscall
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ret
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help0:
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.ascii "Usage: "
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.set help0l, .-help0
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help1:
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.ascii " regex0 [regex1 ...]\nstdout: NUL-separated list of matching strings\n"
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.set help1l, .-help1
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_exit:
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mov $0x3c,%rax
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syscall
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ret
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entry:
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ret
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.bss
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argc:
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.zero 8
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argv:
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.zero 8
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buf:
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.zero 65536
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