Empty mnemonic for ARM lsr instruction

[Quentin01]

Hi,

On the branch next there is an issue with the disassembly of some instructions. The mnemonic is empty and is contained in op_str.

E.g for 30 02 a0 e1 the instruction should be lsr r0, r0, r2, lsr as mnemonic and r0, r0, r2 as op_str, but it's not the case, the mnemonic is empty and lsr is in op_str.

Here is a small code to reproduce the issue:

#include <capstone/capstone.h>

int main() {
	size_t handle = 0;
	if (cs_open(CS_ARCH_ARM, CS_MODE_ARM, &handle) != CS_ERR_OK) {
		printf("Couldn't create cs handle\n");
		return -1;
	}

	size_t pc = 0;
	const uint8_t *code = "\x30\x02\xa0\xe1";
	size_t size = sizeof(code);

	cs_insn *insn = cs_malloc(handle);
	if (!cs_disasm_iter(handle, &code, &size, &pc, insn)) {
		printf("Couldn't disassemble instruction");
		return -1;
	}

	printf("Instruction mnemonic: '%s'\n", insn->mnemonic);
	printf("Instruction operand str: '%s'\n", insn->op_str);

	cs_free(insn, 1);
	cs_close(&handle);

	return 0;
}

The output will be:

Instruction mnemonic: ''
Instruction operand str: 'lsr r0, r0, r2'

The same issue is happening in cstool.

I didn't test the version v5 if the issue is the same.

[Rot127]

@kabeor assign me please to it.