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target-arm: implement Thumb-2 exception return

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Support the "subs pc, lr" Thumb-2 exception return instruction.

Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Paul Brook <paul@codesourcery.com>
This commit is contained in:
Rabin Vincent 2010-02-15 00:02:35 +05:30 committed by Paul Brook
parent fa26df032e
commit b8b45b68f8
1 changed files with 10 additions and 2 deletions
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10
target-arm/translate.c
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@ -8001,8 +8001,16 @@ static int disas_thumb2_insn(CPUState *env, DisasContext *s, uint16_t insn_hw1)
gen_bx(s, tmp);
break;
case 5: /* Exception return. */
/* Unpredictable in user mode. */
if (IS_USER(s)) {
goto illegal_op;
}
if (rn != 14 || rd != 15) {
goto illegal_op;
}
tmp = load_reg(s, rn);
tcg_gen_subi_i32(tmp, tmp, insn & 0xff);
gen_exception_return(s, tmp);
break;
case 6: /* mrs cpsr. */
tmp = new_tmp();
if (IS_M(env)) {