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target/arm: Convert PC-rel addressing to decodetree 

Convert the ADR and ADRP instructions.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20230512144106.3608981-5-peter.maydell@linaro.org
[PMM: Rebased]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2023-05-12 15:40:50 +01:00 committed by Peter Maydell
parent 270076d01a
commit 45fda88ea2
2 changed files with 27 additions and 24 deletions
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13
target/arm/tcg/a64.decode
View File

@ -18,3 +18,16 @@
#
# This file is processed by scripts/decodetree.py
#
&ri rd imm
### Data Processing - Immediate
# PC-rel addressing
%imm_pcrel 5:s19 29:2
@pcrel . .. ..... ................... rd:5 &ri imm=%imm_pcrel
ADR 0 .. 10000 ................... ..... @pcrel
ADRP 1 .. 10000 ................... ..... @pcrel

38
target/arm/tcg/translate-a64.c
View File

@ -4179,31 +4179,24 @@ static void disas_ldst(DisasContext *s, uint32_t insn)
}
}
/* PC-rel. addressing
* 31 30 29 28 24 23 5 4 0
* +----+-------+-----------+-------------------+------+
* | op | immlo | 1 0 0 0 0 | immhi | Rd |
* +----+-------+-----------+-------------------+------+
/*
* PC-rel. addressing
*/
static void disas_pc_rel_adr(DisasContext *s, uint32_t insn)
static bool trans_ADR(DisasContext *s, arg_ri *a)
{
unsigned int page, rd;
int64_t offset;
gen_pc_plus_diff(s, cpu_reg(s, a->rd), a->imm);
return true;
}
page = extract32(insn, 31, 1);
/* SignExtend(immhi:immlo) -> offset */
offset = sextract64(insn, 5, 19);
offset = offset << 2 | extract32(insn, 29, 2);
rd = extract32(insn, 0, 5);
static bool trans_ADRP(DisasContext *s, arg_ri *a)
{
int64_t offset = (int64_t)a->imm << 12;
if (page) {
/* ADRP (page based) */
offset <<= 12;
/* The page offset is ok for CF_PCREL. */
offset -= s->pc_curr & 0xfff;
}
gen_pc_plus_diff(s, cpu_reg(s, rd), offset);
/* The page offset is ok for CF_PCREL. */
offset -= s->pc_curr & 0xfff;
gen_pc_plus_diff(s, cpu_reg(s, a->rd), offset);
return true;
}
/*
@ -4656,9 +4649,6 @@ static void disas_extract(DisasContext *s, uint32_t insn)
static void disas_data_proc_imm(DisasContext *s, uint32_t insn)
{
switch (extract32(insn, 23, 6)) {
case 0x20: case 0x21: /* PC-rel. addressing */
disas_pc_rel_adr(s, insn);
break;
case 0x22: /* Add/subtract (immediate) */
disas_add_sub_imm(s, insn);
break;