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#include "mips.h"
#include "f_addu.c"
int main(int argc, char *argv[])
{
const char *srcName="f_addu-mips.bin";
if(argc>1){
srcName=argv[1];
}
mips_mem_h m=mips_mem_create_ram(0x20000);
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_addu-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.\n", offset);
fclose(src);
// No error checking... oh my!
///////////////////////////////////////////////////////
// we can start the program at the addu instruction
uint32_t a=63, b=45;
mips_cpu_set_pc(c, 4); // Place the program counter on the addu instruction
mips_cpu_set_register(c, 4, a); // Set first input
mips_cpu_set_register(c, 5, b); // Set second input
mips_cpu_step(c); // Execute the addu at address 4
uint32_t sum;
mips_cpu_get_register(c, 2, &sum); // Get the result back
uint32_t sum_ref=a+b;
fprintf(stderr, "%d + %d = %d, expected = %d\n", a, b, sum, sum_ref);
if(sum_ref!=sum){
fprintf(stderr, "Sum is wrong.\n");
exit(1);
}
///////////////////////////////////////////////////////////////
// Or we can execute the whole thing as a proper MIPS function call
a=10000;
b=34239809;
uint32_t sentinelPC=0x10000000;
mips_cpu_reset(c); // get back to a zero state, with pc=0
mips_cpu_set_register(c, 31, sentinelPC); // set function return address to something invalid just in case
mips_cpu_set_register(c, 4, a); // Set first function input (MIPS calling convention)
mips_cpu_set_register(c, 5, b); // Set second input argument (MIPS calling convention)
mips_cpu_step(c); // execute the jr at address 0
mips_cpu_step(c); // execute the addu in the delay slot at address 4
mips_cpu_get_register(c, 2, &sum); // Get function result back (MIPS calling convention)
sum_ref=a+b;
fprintf(stderr, "%d + %d = %d, expected = %d\n", a, b, sum, sum_ref);
if(sum_ref!=sum){
fprintf(stderr, "Sum is wrong.\n");
exit(1);
}
return 0;
}
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