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arm-asm: Raise error if more than two operands are specified on mov, mvn, cmp, cmn, tst, teq

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Danny Milosavljevic 2020-12-27 16:35:33 +01:00
parent 612d9d7ae6
commit 79567004b4
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GPG key ID: E71A35542C30BAA5
1 changed files with 11 additions and 5 deletions
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16
arm-asm.c
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@ -466,8 +466,9 @@ static void asm_data_processing_opcode(TCCState *s1, int token)
int nb_shift = 0;
uint32_t operands = 0;
/* 16 entries per instruction for the different condition codes */
/* modulo 16 entries per instruction for the different condition codes */
uint32_t opcode_idx = (ARM_INSTRUCTION_GROUP(token) - TOK_ASM_andeq) >> 4;
uint32_t opcode_nos = opcode_idx >> 1; // without "s"; "OpCode" in ARM docs
for (nb_ops = 0; nb_ops < sizeof(ops)/sizeof(ops[0]); ) {
if (tok == TOK_ASM_asl || tok == TOK_ASM_lsl || tok == TOK_ASM_lsr || tok == TOK_ASM_asr || tok == TOK_ASM_ror || tok == TOK_ASM_rrx)
@ -517,6 +518,11 @@ static void asm_data_processing_opcode(TCCState *s1, int token)
memcpy(&ops[2], &ops[1], sizeof(ops[1])); // move ops[2]
memcpy(&ops[1], &ops[0], sizeof(ops[0])); // ops[1] was implicit
nb_ops = 3;
} else if (nb_ops == 3) {
if (opcode_nos == 0xd || opcode_nos == 0xf || opcode_nos == 0xa || opcode_nos == 0xb || opcode_nos == 0x8 || opcode_nos == 0x9) { // mov, mvn, cmp, cmn, tst, teq
tcc_error("'%s' cannot be used with three operands", get_tok_str(token, NULL));
return;
}
}
if (nb_ops != 3) {
expect("two or three operands");
@ -533,16 +539,16 @@ static void asm_data_processing_opcode(TCCState *s1, int token)
// bits 24...21: "OpCode"--see below
/* operations in the token list are ordered by opcode */
opcode = (opcode_idx >> 1) << 21; // drop "s"
opcode = opcode_nos << 21; // drop "s"
if (ops[0].type != OP_REG32)
expect("(destination operand) register");
else if (opcode == 0xa << 21 || opcode == 0xb << 21 || opcode == 0x8 << 21 || opcode == 0x9 << 21 ) // cmp, cmn, tst, teq
else if (opcode_nos == 0xa || opcode_nos == 0xb || opcode_nos == 0x8 || opcode_nos == 0x9) // cmp, cmn, tst, teq
operands |= ENCODE_SET_CONDITION_CODES; // force S set, otherwise it's a completely different instruction.
else
operands |= ENCODE_RD(ops[0].reg);
if (ops[1].type != OP_REG32)
expect("(first source operand) register");
else if (!(opcode == 0xd << 21 || opcode == 0xf << 21)) // not: mov, mvn (those have only one source operand)
else if (!(opcode_nos == 0xd || opcode_nos == 0xf)) // not: mov, mvn (those have only one source operand)
operands |= ENCODE_RN(ops[1].reg);
switch (ops[2].type) {
case OP_REG32:
@ -562,7 +568,7 @@ static void asm_data_processing_opcode(TCCState *s1, int token)
1001 = TEQ - CC on: Op1 EOR Op2 -> difficult
1100 = ORR - Rd:= Op1 OR Op2 -> difficult
*/
switch (opcode_idx >> 1) { // "OpCode" in ARM docs
switch (opcode_nos) {
#if 0
case 0x0: // AND - Rd:= Op1 AND Op2
opcode = 0xe << 21; // BIC