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target/arm: Convert T16 load/store multiple

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Backports commit 6e8514ba408f3cc758cd47e2da5475d8684507ec from qemu
This commit is contained in:
Richard Henderson 2019-11-20 12:12:41 -05:00 committed by Lioncash
parent 10c8008266
commit c52cfb9aa6
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 17 additions and 39 deletions
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8
qemu/target/arm/t16.decode
View file

@ -26,6 +26,7 @@
&ri !extern rd imm
&ldst_rr !extern p w u rn rt rm shimm shtype
&ldst_ri !extern p w u rn rt imm
&ldst_block !extern rn i b u w list
# Set S if the instruction is outside of an IT block.
%s !function=t16_setflags
@ -109,3 +110,10 @@ LDR_ri 10011 ... ........ @ldst_spec_i rn=13
ADR 10100 rd:3 ........ imm=%imm8_0x4
ADD_rri 10101 rd:3 ........ \
&s_rri_rot rn=13 s=0 rot=0 imm=%imm8_0x4 # SP
# Load/store multiple
@ldstm ..... rn:3 list:8 &ldst_block i=1 b=0 u=0 w=1
STM 11000 ... ........ @ldstm
LDM_t16 11001 ... ........ @ldstm

48
qemu/target/arm/translate.c
View file

@ -10426,6 +10426,14 @@ static bool trans_LDM_t32(DisasContext *s, arg_ldst_block *a)
return do_ldm(s, a, 2);
}
static bool trans_LDM_t16(DisasContext *s, arg_ldst_block *a)
{
/* Writeback is conditional on the base register not being loaded. */
a->w = !(a->list & (1 << a->rn));
/* BitCount(list) < 1 is UNPREDICTABLE */
return do_ldm(s, a, 1);
}
/*
* Branch, branch with link
*/
@ -11221,6 +11229,7 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
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 12: /* load/store multiple, in decodetree */
goto illegal_op;
case 11:
@ -11444,45 +11453,6 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
}
break;
case 12:
{
/* load/store multiple */
TCGv_i32 loaded_var = NULL;
rn = (insn >> 8) & 0x7;
addr = load_reg(s, rn);
for (i = 0; i < 8; i++) {
if (insn & (1 << i)) {
if (insn & (1 << 11)) {
/* load */
tmp = tcg_temp_new_i32(tcg_ctx);
gen_aa32_ld32u(s, tmp, addr, get_mem_index(s));
if (i == rn) {
loaded_var = tmp;
} else {
store_reg(s, i, tmp);
}
} else {
/* store */
tmp = load_reg(s, i);
gen_aa32_st32(s, tmp, addr, get_mem_index(s));
tcg_temp_free_i32(tcg_ctx, tmp);
}
/* advance to the next address */
tcg_gen_addi_i32(tcg_ctx, addr, addr, 4);
}
}
if ((insn & (1 << rn)) == 0) {
/* base reg not in list: base register writeback */
store_reg(s, rn, addr);
} else {
/* base reg in list: if load, complete it now */
if (insn & (1 << 11)) {
store_reg(s, rn, loaded_var);
}
tcg_temp_free_i32(tcg_ctx, addr);
}
break;
}
case 13:
/* conditional branch or swi */
cond = (insn >> 8) & 0xf;