1 files changed, 87 insertions, 0 deletions
diff --git a/fragments/run_addu.cpp b/fragments/run_addu.cpp
new file mode 100644
index 0000000..effa24e
--- /dev/null
+++ b/fragments/run_addu.cpp
@@ -0,0 +1,87 @@
+#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, 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_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;
+}