604 lines
12 KiB
C
604 lines
12 KiB
C
#include "vm.h"
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#define FRAME_HEADER_SIZE 12
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u32 pc; /* program counter */
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u32 cp; /* code pointer */
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u32 mp; /* memory pointer */
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u32 fp; /* frame pointer */
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u8 sp; /* child local count */
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u32 flag; /* flag */
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u8 interrupt; /* device interrupt */
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u32 *code; /* code */
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u8 *mem; /* memory */
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bool step_vm() {
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u32 instruction = code[pc++];
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u8 opcode = DECODE_OP(instruction);
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switch (opcode) {
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case OP_HALT: {
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/* no need to decode, all are zeros */
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return false;
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}
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case OP_CALL: {
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DECODE_A(instruction)
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u32 fn_ptr;
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u32 rd = fp + (dest * 4);
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u32 r1 = src1;
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u32 r2 = fp + src2;
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fn_ptr = READ_U32(rd);
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/* push parents frame value to reset the heap to */
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WRITE_U32(mp, fp);
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mp += 4;
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/* push return address to child frame */
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WRITE_U32(mp, pc);
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mp += 4;
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/* push local address to return the value to */
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WRITE_U32(mp, r2);
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mp += 4;
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/* now set the frame pointer, where the locals start */
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fp = mp;
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/* move mp by count many locals */
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mp += (4 * r1);
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/* jump to dest_ptr */
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pc = fn_ptr;
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return true;
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}
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case OP_RETURN: {
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DECODE_B(instruction)
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u32 i, size = 0;
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u32 return_local = fp + (dest * 4);
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u32 return_value = READ_U32(return_local);
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bool is_ptr = (((u32)(1)) << 15) & imm;
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bool replaces_value = (((u32)(1)) << 14) & imm;
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/* reset mp to saved mp, use header size to get "real" start of frame */
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u32 frame_start = fp - FRAME_HEADER_SIZE;
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u32 parent_fp = READ_U32(frame_start);
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u32 return_address = READ_U32(frame_start + 4);
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u32 parent_local_return_address = 4 * READ_U32(frame_start + 8);
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USED(replaces_value);
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/* reset memory to parents end of memory */
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mp = fp - FRAME_HEADER_SIZE;
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/* reset the frame pointer */
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fp = parent_fp;
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/* copy value to end of mp if it is a pointer */
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if (is_ptr) {
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WRITE_U32(parent_local_return_address, mp);
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size = READ_U32(return_value);
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WRITE_U32(mp, size);
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mp += 4;
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for (i = 0; i < size; i++) {
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u8 value = READ_U8(return_value + i);
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WRITE_U8(mp, value);
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mp++;
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}
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} else {
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/* otherwise just write the return value to its location */
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WRITE_U32(parent_local_return_address, return_value);
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}
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/* jump to parent frame */
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pc = return_address;
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return true;
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}
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case OP_SYSCALL: {
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DECODE_A(instruction)
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u32 id = dest;
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u32 args = src1;
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u32 rd = fp + (src2 * 4);
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flag = syscall(id, args, rd);
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return true;
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}
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case OP_LOAD_IMM: {
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DECODE_B(instruction)
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u32 rd = fp + (dest * 4);
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WRITE_U32(rd, imm);
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return true;
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}
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case OP_LOAD_UPPER_IMM: {
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DECODE_B(instruction)
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u32 rd = fp + (dest * 4);
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u32 value = READ_U32(rd);
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WRITE_U32(rd, (value | (((u32)(imm)) << 16)));
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return true;
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}
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case OP_LOAD_IND_8: {
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}
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case OP_LOAD_IND_16: {
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}
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case OP_LOAD_IND_32: {
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}
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case OP_LOAD_ABS_8: {
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}
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case OP_LOAD_ABS_16: {
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}
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case OP_LOAD_ABS_32: {
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}
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case OP_LOAD_OFF_8: {
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}
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case OP_LOAD_OFF_16: {
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}
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case OP_LOAD_OFF_32: {
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}
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case OP_STORE_ABS_8: {
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}
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case OP_STORE_ABS_16: {
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}
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case OP_STORE_ABS_32: {
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}
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case OP_STORE_IND_8: {
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}
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case OP_STORE_IND_16: {
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}
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case OP_STORE_IND_32: {
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}
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case OP_STORE_OFF_8: {
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}
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case OP_STORE_OFF_16: {
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}
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case OP_STORE_OFF_32: {
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}
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case OP_MEM_ALLOC: {
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DECODE_A(instruction)
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u32 size, ldest;
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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USED(src2);
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ldest = READ_U32(rd);
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WRITE_U32(ldest, mp);
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size = READ_U32(r1);
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WRITE_U32(mp, size);
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mp += (size + 4);
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return true;
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}
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case OP_MEM_CPY_8: {
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DECODE_A(instruction)
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u32 i, count, mdest, msrc;
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 r2 = fp + (src2 * 4);
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mdest = READ_U32(rd);
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msrc = READ_U32(r1);
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count = READ_U32(r2);
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if (mdest + count >= mp) {
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flag = 1;
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return true;
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}
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for (i = 0; i < count; i++) {
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u8 value = READ_U8(mdest + i);
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WRITE_U8(msrc + i, value);
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}
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flag = 0;
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return true;
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}
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case OP_MEM_CPY_16: {
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DECODE_A(instruction)
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u32 i, count, mdest, msrc;
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 r2 = fp + (src2 * 4);
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mdest = READ_U32(rd);
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msrc = READ_U32(r1);
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count = READ_U32(r2);
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if (mdest + count >= mp) {
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flag = 1;
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return true;
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}
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for (i = 0; i < count; i++) {
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u16 value = READ_U16(mdest + i);
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WRITE_U16(msrc + i, value);
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}
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flag = 0;
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return true;
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}
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case OP_MEM_CPY_32: {
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DECODE_A(instruction)
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u32 i, count, mdest, msrc;
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 r2 = fp + (src2 * 4);
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mdest = READ_U32(rd);
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msrc = READ_U32(r1);
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count = READ_U32(r2);
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if (mdest + count >= mp) {
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flag = 1;
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return true;
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}
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for (i = 0; i < count; i++) {
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u32 value = READ_U32(mdest + i);
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WRITE_U32(msrc + i, value);
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}
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flag = 0;
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return true;
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}
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case OP_MEM_SET_8: {
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DECODE_A(instruction)
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u32 i, start, end;
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 r2 = fp + (src2 * 4);
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u8 value = (u8)READ_U32(r1);
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u32 count = READ_U32(r2);
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if (r2 == 0) {
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flag = 1;
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return true;
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}
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start = READ_U32(rd);
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end = start + count;
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if (start >= mp || r2 > mp || end > mp) {
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flag = 1;
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return true;
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}
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for (i = start; i < end; i++) {
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WRITE_U8(i, value);
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}
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flag = 0;
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return true;
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}
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case OP_MEM_SET_16: {
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DECODE_A(instruction)
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u32 i, start, end;
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 r2 = fp + (src2 * 4);
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u16 value = (u16)READ_U32(r1);
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u32 count = READ_U32(r2);
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if (r2 == 0) {
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flag = 1;
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return true;
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}
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start = READ_U32(rd);
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end = start + count;
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if (start >= mp || r2 > mp || end > mp) {
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flag = 1;
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return true;
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}
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for (i = start; i < end; i += 2) {
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WRITE_U16(i, value);
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}
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flag = 0;
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return true;
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}
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case OP_MEM_SET_32: {
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DECODE_A(instruction)
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u32 i, start, end;
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 r2 = fp + (src2 * 4);
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u32 value = READ_U32(r1);
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u32 count = READ_U32(r2);
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if (r2 == 0) {
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flag = 1;
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return true;
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}
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start = READ_U32(rd);
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end = start + count;
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if (start >= mp || r2 > mp || end > mp) {
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flag = 1;
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return true;
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}
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for (i = start; i < end; i += 4) {
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WRITE_U32(i, value);
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}
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flag = 0;
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return true;
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}
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case OP_MOV: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 value = READ_U32(r1);
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USED(src2);
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WRITE_U32(rd, value);
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return true;
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}
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case OP_PUSH: {
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DECODE_B(instruction)
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u32 rd = fp + (dest * 4);
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u32 val = READ_U32(rd);
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USED(imm);
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WRITE_U32((mp + (4 * (sp + 3))), val);
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sp++;
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return true;
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}
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case OP_POP: {
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DECODE_C(instruction)
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USED(imm);
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mp -= 4;
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return true;
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}
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case OP_ADD_INT: {
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MATH_OP(i32, +);
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}
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case OP_SUB_INT: {
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MATH_OP(i32, -);
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}
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case OP_MUL_INT: {
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MATH_OP(i32, *);
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}
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case OP_DIV_INT: {
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MATH_OP(i32, /);
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}
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case OP_ADD_NAT: {
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MATH_OP(u32, +);
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}
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case OP_SUB_NAT: {
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MATH_OP(u32, -);
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}
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case OP_MUL_NAT: {
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MATH_OP(u32, *);
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}
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case OP_DIV_NAT: {
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MATH_OP(u32, /);
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}
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case OP_ADD_REAL: {
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MATH_OP(i32, +);
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}
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case OP_SUB_REAL: {
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MATH_OP(i32, -);
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}
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case OP_MUL_REAL: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 r2 = fp + (src2 * 4);
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i32 src1_whole = (i32)READ_U32(r1) >> 16;
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i32 src2_whole = (i32)READ_U32(r2) >> 16;
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i32 src1_decimal = (i32)READ_U32(r1) & 16;
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i32 src2_decimal = (i32)READ_U32(r2) & 16;
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i32 result = 0;
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result += (src1_whole * src2_whole) << 16;
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result += (src1_whole * src2_decimal);
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result += (src1_decimal * src2_whole);
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result += ((src1_decimal * src2_decimal) >> 16) & 16;
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WRITE_U32(rd, result);
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return true;
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}
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case OP_DIV_REAL: {
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DECODE_A(instruction)
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i32 result;
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 r2 = fp + (src2 * 4);
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i32 src1_val = (i32)READ_U32(r1);
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i32 src2_val = (i32)READ_U32(r2);
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u32 src2_reciprocal = 1;
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src2_reciprocal <<= 31;
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src2_reciprocal = (u32)(src2_reciprocal / src2_val);
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result = src1_val * src2_reciprocal;
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result <<= 1;
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WRITE_U32(rd, result);
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return true;
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}
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case OP_INT_TO_REAL: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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i32 result = (i32)READ_U32(r1) << 16;
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USED(src2);
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WRITE_U32(rd, result);
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return true;
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}
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case OP_INT_TO_NAT: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 result = (u32)READ_U32(r1);
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USED(src2);
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WRITE_U32(rd, result);
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return true;
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}
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case OP_NAT_TO_REAL: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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i32 result = ((i32)READ_U32(r1) << 16);
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USED(src2);
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WRITE_U32(rd, result);
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return true;
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}
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case OP_NAT_TO_INT: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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i32 result = ((i32)READ_U32(r1));
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USED(src2);
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WRITE_U32(rd, result);
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return true;
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}
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case OP_REAL_TO_INT: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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i32 result = ((i32)READ_U32(r1) >> 16);
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USED(src2);
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WRITE_U32(rd, result);
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return true;
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}
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case OP_REAL_TO_NAT: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 result = ((u32)READ_U32(r1) >> 16);
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USED(src2);
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WRITE_U32(rd, result);
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return true;
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}
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case OP_BIT_SHIFT_LEFT: {
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MATH_OP_NO_CAST(<<);
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}
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case OP_BIT_SHIFT_RIGHT: {
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MATH_OP_NO_CAST(>>);
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}
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case OP_BIT_SHIFT_R_EXT: {
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MATH_OP(i32, >>);
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}
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case OP_BIT_AND: {
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MATH_OP_NO_CAST(&);
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}
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case OP_BIT_OR: {
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MATH_OP_NO_CAST(|);
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}
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case OP_BIT_XOR: {
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MATH_OP_NO_CAST(^);
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}
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case OP_JMP_IMM: {
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DECODE_C(instruction)
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pc = imm;
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return true;
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}
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case OP_JMP_ABS: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 jmp_dest = READ_U32(rd);
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if (jmp_dest > cp) {
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flag = 1;
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return true;
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}
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USED(src1);
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USED(src2);
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pc = jmp_dest;
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return true;
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}
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case OP_JMP_OFF: {
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DECODE_A(instruction)
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u32 rd = fp + (dest * 4);
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u32 r1 = fp + (src1 * 4);
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u32 jmp_dest = READ_U32(rd) + READ_U32(r1);
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if (jmp_dest > cp) {
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flag = 1;
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return true;
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}
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USED(src2);
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pc = jmp_dest;
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return true;
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}
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case OP_JMP_FLAG: {
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DECODE_A(instruction)
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u32 mask;
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u32 rd = fp + (dest * 4);
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u32 jmp_dest = READ_U32(rd);
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if (jmp_dest > cp) {
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flag = 1;
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return true;
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}
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USED(src1);
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USED(src2);
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mask = -(u32)(flag == 0);
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pc = (jmp_dest & mask) | (pc & ~mask);
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return true;
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}
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case OP_JEQ_INT: {
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COMPARE_AND_JUMP(i32, ==);
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}
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case OP_JNE_INT: {
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COMPARE_AND_JUMP(i32, !=);
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}
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case OP_JGT_INT: {
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COMPARE_AND_JUMP(i32, >);
|
|
}
|
|
case OP_JLT_INT: {
|
|
COMPARE_AND_JUMP(i32, <);
|
|
}
|
|
case OP_JLE_INT: {
|
|
COMPARE_AND_JUMP(i32, <=);
|
|
}
|
|
case OP_JGE_INT: {
|
|
COMPARE_AND_JUMP(i32, >=);
|
|
}
|
|
case OP_JEQ_NAT: {
|
|
COMPARE_AND_JUMP(u32, ==);
|
|
}
|
|
case OP_JNE_NAT: {
|
|
COMPARE_AND_JUMP(u32, !=);
|
|
}
|
|
case OP_JGT_NAT: {
|
|
COMPARE_AND_JUMP(u32, >);
|
|
}
|
|
case OP_JLT_NAT: {
|
|
COMPARE_AND_JUMP(u32, <);
|
|
}
|
|
case OP_JLE_NAT: {
|
|
COMPARE_AND_JUMP(u32, <=);
|
|
}
|
|
case OP_JGE_NAT: {
|
|
COMPARE_AND_JUMP(u32, >=);
|
|
}
|
|
case OP_JEQ_REAL: {
|
|
COMPARE_AND_JUMP(i32, ==);
|
|
}
|
|
case OP_JNE_REAL: {
|
|
COMPARE_AND_JUMP(i32, !=);
|
|
}
|
|
case OP_JGE_REAL: {
|
|
COMPARE_AND_JUMP(i32, >=);
|
|
}
|
|
case OP_JGT_REAL: {
|
|
COMPARE_AND_JUMP(i32, >);
|
|
}
|
|
case OP_JLT_REAL: {
|
|
COMPARE_AND_JUMP(i32, <);
|
|
}
|
|
case OP_JLE_REAL: {
|
|
COMPARE_AND_JUMP(i32, <=);
|
|
}
|
|
}
|
|
|
|
/* something went very wrong */
|
|
flag = 255;
|
|
return false;
|
|
}
|