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target/arm: Convert atomic memory ops to decodetree 

Convert the insns in the atomic memory operations group to
decodetree.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230602155223.2040685-16-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2023-06-19 11:20:23 +01:00
parent f36bf0c14a
commit 54a9ab74ed
2 changed files with 70 additions and 98 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
target/arm/tcg/a64.decode
View File

@ -442,3 +442,18 @@ STR_v sz:2 111 1 00 00 1 ..... ... . 10 ..... ..... @ldst sign=0 ext=0
STR_v 00 111 1 00 10 1 ..... ... . 10 ..... ..... @ldst sign=0 ext=0 sz=4
LDR_v sz:2 111 1 00 01 1 ..... ... . 10 ..... ..... @ldst sign=0 ext=0
LDR_v 00 111 1 00 11 1 ..... ... . 10 ..... ..... @ldst sign=0 ext=0 sz=4
# Atomic memory operations
&atomic rs rn rt a r sz
@atomic sz:2 ... . .. a:1 r:1 . rs:5 . ... .. rn:5 rt:5 &atomic
LDADD .. 111 0 00 . . 1 ..... 0000 00 ..... ..... @atomic
LDCLR .. 111 0 00 . . 1 ..... 0001 00 ..... ..... @atomic
LDEOR .. 111 0 00 . . 1 ..... 0010 00 ..... ..... @atomic
LDSET .. 111 0 00 . . 1 ..... 0011 00 ..... ..... @atomic
LDSMAX .. 111 0 00 . . 1 ..... 0100 00 ..... ..... @atomic
LDSMIN .. 111 0 00 . . 1 ..... 0101 00 ..... ..... @atomic
LDUMAX .. 111 0 00 . . 1 ..... 0110 00 ..... ..... @atomic
LDUMIN .. 111 0 00 . . 1 ..... 0111 00 ..... ..... @atomic
SWP .. 111 0 00 . . 1 ..... 1000 00 ..... ..... @atomic
LDAPR sz:2 111 0 00 1 0 1 11111 1100 00 rn:5 rt:5

153
target/arm/tcg/translate-a64.c
View File

@ -3241,113 +3241,32 @@ static bool trans_STR_v(DisasContext *s, arg_ldst *a)
return true;
}
/* Atomic memory operations
*
* 31 30 27 26 24 22 21 16 15 12 10 5 0
* +------+-------+---+-----+-----+---+----+----+-----+-----+----+-----+
* | size | 1 1 1 | V | 0 0 | A R | 1 | Rs | o3 | opc | 0 0 | Rn | Rt |
* +------+-------+---+-----+-----+--------+----+-----+-----+----+-----+
*
* Rt: the result register
* Rn: base address or SP
* Rs: the source register for the operation
* V: vector flag (always 0 as of v8.3)
* A: acquire flag
* R: release flag
*/
static void disas_ldst_atomic(DisasContext *s, uint32_t insn,
int size, int rt, bool is_vector)
static bool do_atomic_ld(DisasContext *s, arg_atomic *a, AtomicThreeOpFn *fn,
int sign, bool invert)
{
int rs = extract32(insn, 16, 5);
int rn = extract32(insn, 5, 5);
int o3_opc = extract32(insn, 12, 4);
bool r = extract32(insn, 22, 1);
bool a = extract32(insn, 23, 1);
TCGv_i64 tcg_rs, tcg_rt, clean_addr;
AtomicThreeOpFn *fn = NULL;
MemOp mop = size;
MemOp mop = a->sz | sign;
TCGv_i64 clean_addr, tcg_rs, tcg_rt;
if (is_vector || !dc_isar_feature(aa64_atomics, s)) {
unallocated_encoding(s);
return;
}
switch (o3_opc) {
case 000: /* LDADD */
fn = tcg_gen_atomic_fetch_add_i64;
break;
case 001: /* LDCLR */
fn = tcg_gen_atomic_fetch_and_i64;
break;
case 002: /* LDEOR */
fn = tcg_gen_atomic_fetch_xor_i64;
break;
case 003: /* LDSET */
fn = tcg_gen_atomic_fetch_or_i64;
break;
case 004: /* LDSMAX */
fn = tcg_gen_atomic_fetch_smax_i64;
mop |= MO_SIGN;
break;
case 005: /* LDSMIN */
fn = tcg_gen_atomic_fetch_smin_i64;
mop |= MO_SIGN;
break;
case 006: /* LDUMAX */
fn = tcg_gen_atomic_fetch_umax_i64;
break;
case 007: /* LDUMIN */
fn = tcg_gen_atomic_fetch_umin_i64;
break;
case 010: /* SWP */
fn = tcg_gen_atomic_xchg_i64;
break;
case 014: /* LDAPR, LDAPRH, LDAPRB */
if (!dc_isar_feature(aa64_rcpc_8_3, s) ||
rs != 31 || a != 1 || r != 0) {
unallocated_encoding(s);
return;
}
break;
default:
unallocated_encoding(s);
return;
}
if (rn == 31) {
if (a->rn == 31) {
gen_check_sp_alignment(s);
}
mop = check_atomic_align(s, rn, mop);
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn), false, rn != 31, mop);
if (o3_opc == 014) {
/*
* LDAPR* are a special case because they are a simple load, not a
* fetch-and-do-something op.
* The architectural consistency requirements here are weaker than
* full load-acquire (we only need "load-acquire processor consistent"),
* but we choose to implement them as full LDAQ.
*/
do_gpr_ld(s, cpu_reg(s, rt), clean_addr, mop, false,
true, rt, disas_ldst_compute_iss_sf(size, false, 0), true);
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
return;
}
tcg_rs = read_cpu_reg(s, rs, true);
tcg_rt = cpu_reg(s, rt);
if (o3_opc == 1) { /* LDCLR */
mop = check_atomic_align(s, a->rn, mop);
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, a->rn), false,
a->rn != 31, mop);
tcg_rs = read_cpu_reg(s, a->rs, true);
tcg_rt = cpu_reg(s, a->rt);
if (invert) {
tcg_gen_not_i64(tcg_rs, tcg_rs);
}
/* The tcg atomic primitives are all full barriers. Therefore we
/*
* The tcg atomic primitives are all full barriers. Therefore we
* can ignore the Acquire and Release bits of this instruction.
*/
fn(tcg_rt, clean_addr, tcg_rs, get_mem_index(s), mop);
if (mop & MO_SIGN) {
switch (size) {
switch (a->sz) {
case MO_8:
tcg_gen_ext8u_i64(tcg_rt, tcg_rt);
break;
@ -3363,6 +3282,46 @@ static void disas_ldst_atomic(DisasContext *s, uint32_t insn,
g_assert_not_reached();
}
}
return true;
}
TRANS_FEAT(LDADD, aa64_atomics, do_atomic_ld, a, tcg_gen_atomic_fetch_add_i64, 0, false)
TRANS_FEAT(LDCLR, aa64_atomics, do_atomic_ld, a, tcg_gen_atomic_fetch_and_i64, 0, true)
TRANS_FEAT(LDEOR, aa64_atomics, do_atomic_ld, a, tcg_gen_atomic_fetch_xor_i64, 0, false)
TRANS_FEAT(LDSET, aa64_atomics, do_atomic_ld, a, tcg_gen_atomic_fetch_or_i64, 0, false)
TRANS_FEAT(LDSMAX, aa64_atomics, do_atomic_ld, a, tcg_gen_atomic_fetch_smax_i64, MO_SIGN, false)
TRANS_FEAT(LDSMIN, aa64_atomics, do_atomic_ld, a, tcg_gen_atomic_fetch_smin_i64, MO_SIGN, false)
TRANS_FEAT(LDUMAX, aa64_atomics, do_atomic_ld, a, tcg_gen_atomic_fetch_umax_i64, 0, false)
TRANS_FEAT(LDUMIN, aa64_atomics, do_atomic_ld, a, tcg_gen_atomic_fetch_umin_i64, 0, false)
TRANS_FEAT(SWP, aa64_atomics, do_atomic_ld, a, tcg_gen_atomic_xchg_i64, 0, false)
static bool trans_LDAPR(DisasContext *s, arg_LDAPR *a)
{
bool iss_sf = ldst_iss_sf(a->sz, false, false);
TCGv_i64 clean_addr;
MemOp mop;
if (!dc_isar_feature(aa64_atomics, s) ||
!dc_isar_feature(aa64_rcpc_8_3, s)) {
return false;
}
if (a->rn == 31) {
gen_check_sp_alignment(s);
}
mop = check_atomic_align(s, a->rn, a->sz);
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, a->rn), false,
a->rn != 31, mop);
/*
* LDAPR* are a special case because they are a simple load, not a
* fetch-and-do-something op.
* The architectural consistency requirements here are weaker than
* full load-acquire (we only need "load-acquire processor consistent"),
* but we choose to implement them as full LDAQ.
*/
do_gpr_ld(s, cpu_reg(s, a->rt), clean_addr, mop, false,
true, a->rt, iss_sf, true);
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
return true;
}
/*
@ -3529,8 +3488,6 @@ static void disas_ldst_reg(DisasContext *s, uint32_t insn)
}
switch (extract32(insn, 10, 2)) {
case 0:
disas_ldst_atomic(s, insn, size, rt, is_vector);
return;
case 2:
break;
default: