33 lines
811 B
ArmAsm
33 lines
811 B
ArmAsm
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.define _send, _receive, _sendrec
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.globl _send, _receive, _sendrec
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| See ../h/com.h for C definitions
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SEND = 1
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RECEIVE = 2
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BOTH = 3
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SYSVEC = 32
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|*========================================================================*
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| send and receive *
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|*========================================================================*
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| send(), receive(), sendrec() all save bp, but destroy ax, bx, and cx.
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_send: mov cx,*SEND | send(dest, ptr)
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jmp L0
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_receive:
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mov cx,*RECEIVE | receive(src, ptr)
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jmp L0
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_sendrec:
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mov cx,*BOTH | sendrec(srcdest, ptr)
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jmp L0
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L0: push bp | save bp
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mov bp,sp | can't index off sp
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mov ax,4(bp) | ax = dest-src
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mov bx,6(bp) | bx = message pointer
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int SYSVEC | trap to the kernel
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pop bp | restore bp
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ret | return
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