75 lines
1.3 KiB
C
75 lines
1.3 KiB
C
#include "../../../vm/vm.h"
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#include <stdio.h>
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#define CODE_SIZE 8192
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#define MEMORY_SIZE 65536
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u8 lmem[MEMORY_SIZE] = {0};
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u8 lcode[CODE_SIZE] = {0};
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bool init_vm() {
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mem = lmem;
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code = lcode;
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lc = 0;
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mp = 0;
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cp = 0;
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pc = 0;
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interrupt = 0;
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status = 0;
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return true;
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}
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u32 syscall(u32 id, u32 size, u32 mem_ptr) {
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USED(size);
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switch(id) {
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case SYSCALL_CONSOLE_WRITE: {
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u32 size = *(u32*)&mem[mem_ptr];
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u8 *ptr = &mem[mem_ptr + 4];
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for (u32 i = 0; i < size; i++) {
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putchar(*(ptr++));
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}
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return 0;
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}
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case SYSCALL_CONSOLE_READ: {
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u8 *ptr = &mem[mp];
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mcpy(ptr, &size, sizeof(u32));
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ptr += 4;
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for (u32 i = 0; i < size; i++) {
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u8 ch = getchar();
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if (ch == '\0')
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break;
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if (ch == '\n')
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break;
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*(ptr++) = ch;
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}
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ptr[size] = '\0';
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mp += 4 + size + 1;
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}
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}
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return 1; // generic error
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}
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void test_add_two_num() {
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code[cp++] = OP_GET;
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code[cp++] = OP_GET;
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code[cp++] = OP_GET;
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code[cp++] = OP_CALL;
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code[cp++] = OP_INT_TO_STR;
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code[cp++] = OP_SYSCALL;
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code[cp++] = OP_HALT;
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/* add */
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code[cp++] = OP_ADD_INT;
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code[cp++] = OP_RETURN;
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}
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i32 main() {
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init_vm();
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test_add_two_num();
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while(step_vm()) {
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// do stuff
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}
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return 0;
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}
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