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target/arm: Clean up disas_thumb_insn

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Now that everything is converted, remove the rest of
the legacy decode.

Backports commit 0831403b08122b5bf801b0e3469cc63f019f60f0 from qemu
This commit is contained in:
Richard Henderson 2019-11-20 12:51:59 -05:00 committed by Lioncash
parent a91de478cc
commit e61ca839d3
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 26 deletions
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28
qemu/target/arm/translate.c
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@ -11126,33 +11126,9 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
static void disas_thumb_insn(DisasContext *s, uint32_t insn)
{
if (disas_t16(s, insn)) {
return;
if (!disas_t16(s, insn)) {
unallocated_encoding(s);
}
/* fall back to legacy decoder */
switch (insn >> 12) {
case 0: case 1: /* add/sub (3reg, 2reg imm), shift imm; in decodetree */
case 2: case 3: /* add, sub, cmp, mov (reg, imm), in decodetree */
case 4: /* ldr lit, data proc (2reg), data proc ext, bx; in decodetree */
case 5: /* load/store register offset, in decodetree */
case 6: /* load/store word immediate offset, in decodetree */
case 7: /* load/store byte immediate offset, in decodetree */
case 8: /* load/store halfword immediate offset, in decodetree */
case 9: /* load/store from stack, in decodetree */
case 10: /* add PC/SP (immediate), in decodetree */
case 11: /* misc, in decodetree */
case 12: /* load/store multiple, in decodetree */
case 13: /* conditional branch or swi, in decodetree */
case 14:
case 15:
/* branches, in decodetree */
goto illegal_op;
}
return;
illegal_op:
unallocated_encoding(s);
}
static bool insn_crosses_page(CPUARMState *env, DisasContext *s)