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assemble branch instructions

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This commit is contained in:
EDiasAlberto 2024-06-06 13:01:26 +01:00
parent 262fd6219d
commit 6177b2f748
2 changed files with 9 additions and 5 deletions
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2
src/parser.c
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@ -10,7 +10,7 @@
//TODO:
// - use string matching to get opcode, and operands (DONE)
// - check operand count (DONE)
// - match opcode to a64 struct types (PARTIALLY DONE)
// - match opcode to a64 struct types (DONE)
// - count operands and match type/values
// - generate final a64inst and return

12
src/twopassassembly.c
View File

@ -1,3 +1,5 @@
#include "global.h"
//generates assembled code based on two pass assembly method
void generateSymbolTable(a64inst_instruction instrs[], int numInstrs){
@ -13,26 +15,28 @@ void generateSymbolTable(a64inst_instruction instrs[], int numInstrs){
word assembleBranch(a64inst_instruction *instr, int ){
word binInstr = 0;
binInstr += (5^28); //101 start of branch instr
switch (instr->data.BranchData.BranchType)
{
case a64inst_UNCONDITIONAL:
//000101
//25-0: sign extended simm26
binInstr += instr->data.processOpData.unconditionalOffset;
break;
case a64inst_REGISTER:
//1101011
//0000
//10000
//11111
//000000
//9-5: address from register
//0000
binInstr += ((instr->processOpData.src)^5);
break;
case a64inst_CONDITIONAL:
// 01010100
// 25-5: sign extended offset
// 4-0: 0{condition}
binInstr += ((instr->processOpData.offset)^5);
binInstr += instr->processOpData.cond;
break;
default:
break;