ack/mach/vax4/libsysV_2/syscall.s

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ArmAsm
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.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
.define _syscall
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_syscall:
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.data2 0x0000
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movl 4(ap),r0
subl3 $1,(ap)+,(ap)
chmk r0
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bcc 1f
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jmp cerror
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1:
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ret