60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
#if defined(__mips__)
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#include "../int.h"
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void exit(int8_t status){
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asm (
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"move $a0, %0\n"
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"li $v0, 4001\n"
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"syscall\n"
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:
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: "r" (status)
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: "a0", "v0"
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);
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for(;;);
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}
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intptr_t write(int32_t fd, const void* buf, intptr_t size){
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intptr_t n_written = 0;
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asm volatile (
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"move $a0, %1\n"
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"move $a1, %2\n"
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"move $a2, %3\n"
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"li $v0, 4004\n"
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"syscall\n"
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"move %0, $v0\n"
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: "=r"(n_written)
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: "r"(fd), "r"(buf), "r"(size)
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: "a0", "a1", "a2", "v0" //TODO: temp registers clobbered by syscall should probably also be listed but this fn returns right away so it should be fine?
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);
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return n_written;
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}
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intptr_t read(int32_t fd, const void* buf, intptr_t size){
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intptr_t n_read = 0;
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asm volatile (
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"move $a0, %1\n"
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"move $a1, %2\n"
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"move $a2, %3\n"
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"li $v0, 4003\n"
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"syscall\n"
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"move %0, $v0\n"
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: "=r"(n_read)
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: "r"(fd), "r"(buf), "r"(size)
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: "a0", "a1", "a2", "v0", "memory" //TODO: temp registers clobbered by syscall should probably also be listed but this fn returns right away so it should be fine?
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);
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return n_read;
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}
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uint32_t fork(){
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int rtn;
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asm (
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"li $v0, 4002\n"
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"syscall\n"
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"move %0, $v0"
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:"=r" (rtn)
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:
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: "a0", "v0"
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);
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return (uint32_t)rtn;
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}
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#endif
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