34 lines
500 B
ArmAsm
34 lines
500 B
ArmAsm
#
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! Declare segments (the order is important).
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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#define EINVAL 22
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! Perform a Linux system call.
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.define __syscall
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__syscall:
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lw r2, 0(sp) ! syscall number
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addiu r2, r2, 4000 ! MIPS uses non-standard numbers
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lw r4, 4(sp)
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lw r5, 8(sp)
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lw r6, 12(sp)
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syscall 0
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beq r7, zero, exit ! branch on success
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nop
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/* The result (in r2) is the errno. */
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lui at, ha16[_errno]
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sw r2, lo16[_errno] (at)
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li r2, -1
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exit:
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jr ra
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nop
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