int main(int argc, char *argv[])
{
const char *srcName="f_fibonacci-mips.bin";
if(argc>1){
srcName=argv[1];
}
mips_mem_h m=mips_mem_create_ram(0x20000, 4);
mips_cpu_h c=mips_cpu_create(m);
FILE *src=fopen(srcName,"rb");
if(!src){
fprintf(stderr, "Cannot load source file '%s', try specifying the relative path to f_fibonacci-mips.bin.", srcName);
exit(1);
}
uint32_t v;
uint32_t offset=0;
while(1==fread(&v, 4, 1, src)){
if(mips_mem_write(m, offset, 4, (uint8_t*)&v)){
fprintf(stderr, "Memory error while loading binary.");
exit(1);
}
offset+=4;
}
fprintf(stderr, "Loaded %d bytes of binary at address 0.", offset);
fclose(src);
// No error checking... oh my!
uint32_t n=12; // Value we will calculate fibonacci of
uint32_t sentinelPC=0x10000000;
mips_cpu_set_register(c, 31, sentinelPC); // set return address to something invalid
mips_cpu_set_register(c, 4, n); // Set input argument
mips_cpu_set_register(c, 29, 0x1000); // Create a stack pointer
uint32_t steps=0;
while(!mips_cpu_step(c)){
fprintf(stderr, "Step %d.\n", steps);
++steps;
uint32_t pc;
mips_cpu_get_pc(c, &pc);
if(pc==sentinelPC)
break;
}
uint32_t fib_n;
mips_cpu_get_register(c, 2, &fib_n); // Get the result back
uint32_t fib_n_ref=f_fibonacci(n);
fprintf(stderr, "fib(%d) = %d, expected = %d\n", n, fib_n, fib_n_ref);
return 0;
}
uint32_t f_fibonacci(uint32_t n)
{
if(n<=1)
return n;
return f_fibonacci(n-1)+f_fibonacci(n-2);
}
