#if defined(__mips__)
#include "../int.h"

void exit(int8_t status){
  asm ( 
    "move $a0, %0\n"
    "li $v0, 4001\n"
    "syscall\n"
    :
    : "r" (status)
    : "a0", "v0"
  );
  for(;;);
}

intptr_t write(int32_t fd, const void* buf, intptr_t size){
  intptr_t n_written = 0;
  asm volatile ( 
    "move $a0, %1\n"
    "move $a1, %2\n"
    "move $a2, %3\n"
    "li $v0, 4004\n"
    "syscall\n"
    "move %0, $v0\n"
    : "=r"(n_written)
    : "r"(fd), "r"(buf), "r"(size)
    : "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?
  );
  return n_written;
}
intptr_t read(int32_t fd, const void* buf, intptr_t size){
  intptr_t n_read = 0;
  asm volatile ( 
    "move $a0, %1\n"
    "move $a1, %2\n"
    "move $a2, %3\n"
    "li $v0, 4003\n"
    "syscall\n"
    "move %0, $v0\n"
    : "=r"(n_read)
    : "r"(fd), "r"(buf), "r"(size)
    : "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?
  );
  return n_read;
}

uint32_t fork(){
  int rtn;
  asm ( 
    "li $v0, 4002\n"
    "syscall\n"
    "move %0, $v0"
    :"=r" (rtn)
    : 
    : "a0", "v0"
  );
  return (uint32_t)rtn;
}

int32_t openat(int32_t fd, const char* filename, uint32_t flags, uint32_t mode) {
  int32_t file = 0;
  asm volatile (
    "move $a0, %1\n"
    "move $a1, %2\n"
    "move $a2, %3\n"
    "move $a3, %4\n"
    "li $v0, 4288\n"
    "syscall\n"
    "move %0, $v0\n"
    : "=r"(file)
    : "r"(fd), "r"(filename), "r"(flags), "r"(mode)
    : "a0", "a1", "a2", "a3", "v0"
  );
  /*
  asm volatile (
    "move $a0, %1\n"
    "move $a1, %2\n"
    "move $a2, %3\n"
    "li $v0, 4005\n"
    "syscall\n"
    "move %0, $v0\n"
    : "=r"(file)
    : "r"(filename), "r"(flags), "r"(mode)
    : "a0", "a1", "a2", "a3", "v0"
  );
  */
  return file;
}

#endif