initial commit

src/main.c

@@ -0,0 +1,75 @@
+#define TINYRISCV_M
+
+#include "tinyriscv.h"
+#include "elf.h"
+#include "config.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+
+#define TEST_A 5u
+#define TEST_B 7u
+#define MAX_STEPS 1024u
+
+
+int main(){
+    uint8_t memory[EMU_MEM_SIZE]; //4kb of internal memory
+    tinyriscv_core cpu;   //create the emulation core
+    memset(&cpu, 0, sizeof(cpu));
+    cpu.mem = memory;  //use the uint8_t array as the memory
+    cpu.mem_size = EMU_MEM_SIZE;
+    memset(memory, 0, sizeof(memory));
+
+    int load_status = load_elf_object_sections(EMU_PROGRAM_PATH, memory, cpu.mem_size);
+    if (load_status != LOAD_OK) {
+        fprintf(stderr, "ELF load failed with code %d for '%s'\n", load_status, EMU_PROGRAM_PATH);
+        fflush(stderr);
+        printf("ELF load failed with code %d\n", load_status);
+        fflush(stdout);
+        return 1;
+    }
+
+    uint32_t entry_offset = 0u;
+    int symbol_status = resolve_elf_symbol_memory_offset(
+        EMU_PROGRAM_PATH, EMU_ENTRY_SYMBOL, cpu.mem_size, &entry_offset);
+    if (symbol_status != LOAD_OK) {
+        fprintf(stderr, "Entry symbol '%s' resolve failed with code %d for '%s'\n",
+            EMU_ENTRY_SYMBOL, symbol_status, EMU_PROGRAM_PATH);
+        return 2;
+    }
+
+    tinyriscv_init(&cpu); //initialise core for execution
+    cpu.pc = tinyriscv_MEM_OFFSET + entry_offset;
+
+    // Call operation(a, b) using RV32 calling convention:
+    // a0=x10, return value in a0, return address in ra=x1.
+    cpu.x[10] = TEST_A;
+    cpu.x[1] = tinyriscv_MEM_OFFSET + cpu.mem_size;
+
+    uint32_t steps = 0u;
+    while (tinyriscv_valid_step(&cpu) && steps < MAX_STEPS) {
+        tinyriscv_step(&cpu);
+        ++steps;
+    }
+
+    if (steps == MAX_STEPS) {
+        fprintf(stderr, "Execution did not halt within %u steps\n", MAX_STEPS);
+        return 2;
+    }
+
+    uint32_t actual = (uint32_t)cpu.x[10];
+    uint32_t expected = ((TEST_A << 3) ^ 0xFF) >> 3;
+    printf("operation(%u) -> %u (expected %u)\n",
+        (unsigned)TEST_A,
+        (unsigned)actual, (unsigned)expected);
+
+    if (actual != expected) {
+        fprintf(stderr, "Verification failed\n");
+        return 3;
+    }
+
+    return 0;
+}
+