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target/arm: Convert load/store-pair to decodetree 

Convert the load/store register pair insns (LDP, STP,
LDNP, STNP, LDPSW, STGP) to decodetree.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20230602155223.2040685-12-peter.maydell@linaro.org
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2023-06-19 11:20:22 +01:00
parent a752c2f459
commit 8c212eb659
2 changed files with 268 additions and 215 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
target/arm/tcg/a64.decode
View File

@ -265,3 +265,64 @@ LD_lit_v 10 011 1 00 ................... ..... @ldlit sz=4 sign=0
# PRFM
NOP 11 011 0 00 ------------------- -----
&ldstpair rt2 rt rn imm sz sign w p
@ldstpair .. ... . ... . imm:s7 rt2:5 rn:5 rt:5 &ldstpair
# STNP, LDNP: Signed offset, non-temporal hint. We don't emulate caches
# so we ignore hints about data access patterns, and handle these like
# plain signed offset.
STP 00 101 0 000 0 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=0
LDP 00 101 0 000 1 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=0
STP 10 101 0 000 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=0
LDP 10 101 0 000 1 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=0
STP_v 00 101 1 000 0 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=0
LDP_v 00 101 1 000 1 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=0
STP_v 01 101 1 000 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=0
LDP_v 01 101 1 000 1 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=0
STP_v 10 101 1 000 0 ....... ..... ..... ..... @ldstpair sz=4 sign=0 p=0 w=0
LDP_v 10 101 1 000 1 ....... ..... ..... ..... @ldstpair sz=4 sign=0 p=0 w=0
# STP and LDP: post-indexed
STP 00 101 0 001 0 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=1 w=1
LDP 00 101 0 001 1 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=1 w=1
LDP 01 101 0 001 1 ....... ..... ..... ..... @ldstpair sz=2 sign=1 p=1 w=1
STP 10 101 0 001 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=1 w=1
LDP 10 101 0 001 1 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=1 w=1
STP_v 00 101 1 001 0 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=1 w=1
LDP_v 00 101 1 001 1 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=1 w=1
STP_v 01 101 1 001 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=1 w=1
LDP_v 01 101 1 001 1 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=1 w=1
STP_v 10 101 1 001 0 ....... ..... ..... ..... @ldstpair sz=4 sign=0 p=1 w=1
LDP_v 10 101 1 001 1 ....... ..... ..... ..... @ldstpair sz=4 sign=0 p=1 w=1
# STP and LDP: offset
STP 00 101 0 010 0 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=0
LDP 00 101 0 010 1 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=0
LDP 01 101 0 010 1 ....... ..... ..... ..... @ldstpair sz=2 sign=1 p=0 w=0
STP 10 101 0 010 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=0
LDP 10 101 0 010 1 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=0
STP_v 00 101 1 010 0 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=0
LDP_v 00 101 1 010 1 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=0
STP_v 01 101 1 010 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=0
LDP_v 01 101 1 010 1 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=0
STP_v 10 101 1 010 0 ....... ..... ..... ..... @ldstpair sz=4 sign=0 p=0 w=0
LDP_v 10 101 1 010 1 ....... ..... ..... ..... @ldstpair sz=4 sign=0 p=0 w=0
# STP and LDP: pre-indexed
STP 00 101 0 011 0 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=1
LDP 00 101 0 011 1 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=1
LDP 01 101 0 011 1 ....... ..... ..... ..... @ldstpair sz=2 sign=1 p=0 w=1
STP 10 101 0 011 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=1
LDP 10 101 0 011 1 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=1
STP_v 00 101 1 011 0 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=1
LDP_v 00 101 1 011 1 ....... ..... ..... ..... @ldstpair sz=2 sign=0 p=0 w=1
STP_v 01 101 1 011 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=1
LDP_v 01 101 1 011 1 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=1
STP_v 10 101 1 011 0 ....... ..... ..... ..... @ldstpair sz=4 sign=0 p=0 w=1
LDP_v 10 101 1 011 1 ....... ..... ..... ..... @ldstpair sz=4 sign=0 p=0 w=1
# STGP: store tag and pair
STGP 01 101 0 001 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=1 w=1
STGP 01 101 0 010 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=0
STGP 01 101 0 011 0 ....... ..... ..... ..... @ldstpair sz=3 sign=0 p=0 w=1

422
target/arm/tcg/translate-a64.c
View File

@ -2816,229 +2816,225 @@ static bool trans_LD_lit_v(DisasContext *s, arg_ldlit *a)
return true;
}
/*
* LDNP (Load Pair - non-temporal hint)
* LDP (Load Pair - non vector)
* LDPSW (Load Pair Signed Word - non vector)
* STNP (Store Pair - non-temporal hint)
* STP (Store Pair - non vector)
* LDNP (Load Pair of SIMD&FP - non-temporal hint)
* LDP (Load Pair of SIMD&FP)
* STNP (Store Pair of SIMD&FP - non-temporal hint)
* STP (Store Pair of SIMD&FP)
*
* 31 30 29 27 26 25 24 23 22 21 15 14 10 9 5 4 0
* +-----+-------+---+---+-------+---+-----------------------------+
* | opc | 1 0 1 | V | 0 | index | L | imm7 | Rt2 | Rn | Rt |
* +-----+-------+---+---+-------+---+-------+-------+------+------+
*
* opc: LDP/STP/LDNP/STNP 00 -> 32 bit, 10 -> 64 bit
* LDPSW/STGP 01
* LDP/STP/LDNP/STNP (SIMD) 00 -> 32 bit, 01 -> 64 bit, 10 -> 128 bit
* V: 0 -> GPR, 1 -> Vector
* idx: 00 -> signed offset with non-temporal hint, 01 -> post-index,
* 10 -> signed offset, 11 -> pre-index
* L: 0 -> Store 1 -> Load
*
* Rt, Rt2 = GPR or SIMD registers to be stored
* Rn = general purpose register containing address
* imm7 = signed offset (multiple of 4 or 8 depending on size)
*/
static void disas_ldst_pair(DisasContext *s, uint32_t insn)
static void op_addr_ldstpair_pre(DisasContext *s, arg_ldstpair *a,
TCGv_i64 *clean_addr, TCGv_i64 *dirty_addr,
uint64_t offset, bool is_store, MemOp mop)
{
int rt = extract32(insn, 0, 5);
int rn = extract32(insn, 5, 5);
int rt2 = extract32(insn, 10, 5);
uint64_t offset = sextract64(insn, 15, 7);
int index = extract32(insn, 23, 2);
bool is_vector = extract32(insn, 26, 1);
bool is_load = extract32(insn, 22, 1);
int opc = extract32(insn, 30, 2);
bool is_signed = false;
bool postindex = false;
bool wback = false;
bool set_tag = false;
TCGv_i64 clean_addr, dirty_addr;
MemOp mop;
int size;
if (opc == 3) {
unallocated_encoding(s);
return;
}
if (is_vector) {
size = 2 + opc;
} else if (opc == 1 && !is_load) {
/* STGP */
if (!dc_isar_feature(aa64_mte_insn_reg, s) || index == 0) {
unallocated_encoding(s);
return;
}
size = 3;
set_tag = true;
} else {
size = 2 + extract32(opc, 1, 1);
is_signed = extract32(opc, 0, 1);
if (!is_load && is_signed) {
unallocated_encoding(s);
return;
}
}
switch (index) {
case 1: /* post-index */
postindex = true;
wback = true;
break;
case 0:
/* signed offset with "non-temporal" hint. Since we don't emulate
* caches we don't care about hints to the cache system about
* data access patterns, and handle this identically to plain
* signed offset.
*/
if (is_signed) {
/* There is no non-temporal-hint version of LDPSW */
unallocated_encoding(s);
return;
}
postindex = false;
break;
case 2: /* signed offset, rn not updated */
postindex = false;
break;
case 3: /* pre-index */
postindex = false;
wback = true;
break;
}
if (is_vector && !fp_access_check(s)) {
return;
}
offset <<= (set_tag ? LOG2_TAG_GRANULE : size);
if (rn == 31) {
if (a->rn == 31) {
gen_check_sp_alignment(s);
}
dirty_addr = read_cpu_reg_sp(s, rn, 1);
if (!postindex) {
*dirty_addr = read_cpu_reg_sp(s, a->rn, 1);
if (!a->p) {
tcg_gen_addi_i64(*dirty_addr, *dirty_addr, offset);
}
*clean_addr = gen_mte_checkN(s, *dirty_addr, is_store,
(a->w || a->rn != 31), 2 << a->sz, mop);
}
static void op_addr_ldstpair_post(DisasContext *s, arg_ldstpair *a,
TCGv_i64 dirty_addr, uint64_t offset)
{
if (a->w) {
if (a->p) {
tcg_gen_addi_i64(dirty_addr, dirty_addr, offset);
}
tcg_gen_mov_i64(cpu_reg_sp(s, a->rn), dirty_addr);
}
}
static bool trans_STP(DisasContext *s, arg_ldstpair *a)
{
uint64_t offset = a->imm << a->sz;
TCGv_i64 clean_addr, dirty_addr, tcg_rt, tcg_rt2;
MemOp mop = finalize_memop(s, a->sz);
op_addr_ldstpair_pre(s, a, &clean_addr, &dirty_addr, offset, true, mop);
tcg_rt = cpu_reg(s, a->rt);
tcg_rt2 = cpu_reg(s, a->rt2);
/*
* We built mop above for the single logical access -- rebuild it
* now for the paired operation.
*
* With LSE2, non-sign-extending pairs are treated atomically if
* aligned, and if unaligned one of the pair will be completely
* within a 16-byte block and that element will be atomic.
* Otherwise each element is separately atomic.
* In all cases, issue one operation with the correct atomicity.
*/
mop = a->sz + 1;
if (s->align_mem) {
mop |= (a->sz == 2 ? MO_ALIGN_4 : MO_ALIGN_8);
}
mop = finalize_memop_pair(s, mop);
if (a->sz == 2) {
TCGv_i64 tmp = tcg_temp_new_i64();
if (s->be_data == MO_LE) {
tcg_gen_concat32_i64(tmp, tcg_rt, tcg_rt2);
} else {
tcg_gen_concat32_i64(tmp, tcg_rt2, tcg_rt);
}
tcg_gen_qemu_st_i64(tmp, clean_addr, get_mem_index(s), mop);
} else {
TCGv_i128 tmp = tcg_temp_new_i128();
if (s->be_data == MO_LE) {
tcg_gen_concat_i64_i128(tmp, tcg_rt, tcg_rt2);
} else {
tcg_gen_concat_i64_i128(tmp, tcg_rt2, tcg_rt);
}
tcg_gen_qemu_st_i128(tmp, clean_addr, get_mem_index(s), mop);
}
op_addr_ldstpair_post(s, a, dirty_addr, offset);
return true;
}
static bool trans_LDP(DisasContext *s, arg_ldstpair *a)
{
uint64_t offset = a->imm << a->sz;
TCGv_i64 clean_addr, dirty_addr, tcg_rt, tcg_rt2;
MemOp mop = finalize_memop(s, a->sz);
op_addr_ldstpair_pre(s, a, &clean_addr, &dirty_addr, offset, false, mop);
tcg_rt = cpu_reg(s, a->rt);
tcg_rt2 = cpu_reg(s, a->rt2);
/*
* We built mop above for the single logical access -- rebuild it
* now for the paired operation.
*
* With LSE2, non-sign-extending pairs are treated atomically if
* aligned, and if unaligned one of the pair will be completely
* within a 16-byte block and that element will be atomic.
* Otherwise each element is separately atomic.
* In all cases, issue one operation with the correct atomicity.
*
* This treats sign-extending loads like zero-extending loads,
* since that reuses the most code below.
*/
mop = a->sz + 1;
if (s->align_mem) {
mop |= (a->sz == 2 ? MO_ALIGN_4 : MO_ALIGN_8);
}
mop = finalize_memop_pair(s, mop);
if (a->sz == 2) {
int o2 = s->be_data == MO_LE ? 32 : 0;
int o1 = o2 ^ 32;
tcg_gen_qemu_ld_i64(tcg_rt, clean_addr, get_mem_index(s), mop);
if (a->sign) {
tcg_gen_sextract_i64(tcg_rt2, tcg_rt, o2, 32);
tcg_gen_sextract_i64(tcg_rt, tcg_rt, o1, 32);
} else {
tcg_gen_extract_i64(tcg_rt2, tcg_rt, o2, 32);
tcg_gen_extract_i64(tcg_rt, tcg_rt, o1, 32);
}
} else {
TCGv_i128 tmp = tcg_temp_new_i128();
tcg_gen_qemu_ld_i128(tmp, clean_addr, get_mem_index(s), mop);
if (s->be_data == MO_LE) {
tcg_gen_extr_i128_i64(tcg_rt, tcg_rt2, tmp);
} else {
tcg_gen_extr_i128_i64(tcg_rt2, tcg_rt, tmp);
}
}
op_addr_ldstpair_post(s, a, dirty_addr, offset);
return true;
}
static bool trans_STP_v(DisasContext *s, arg_ldstpair *a)
{
uint64_t offset = a->imm << a->sz;
TCGv_i64 clean_addr, dirty_addr;
MemOp mop;
if (!fp_access_check(s)) {
return true;
}
/* LSE2 does not merge FP pairs; leave these as separate operations. */
mop = finalize_memop_asimd(s, a->sz);
op_addr_ldstpair_pre(s, a, &clean_addr, &dirty_addr, offset, true, mop);
do_fp_st(s, a->rt, clean_addr, mop);
tcg_gen_addi_i64(clean_addr, clean_addr, 1 << a->sz);
do_fp_st(s, a->rt2, clean_addr, mop);
op_addr_ldstpair_post(s, a, dirty_addr, offset);
return true;
}
static bool trans_LDP_v(DisasContext *s, arg_ldstpair *a)
{
uint64_t offset = a->imm << a->sz;
TCGv_i64 clean_addr, dirty_addr;
MemOp mop;
if (!fp_access_check(s)) {
return true;
}
/* LSE2 does not merge FP pairs; leave these as separate operations. */
mop = finalize_memop_asimd(s, a->sz);
op_addr_ldstpair_pre(s, a, &clean_addr, &dirty_addr, offset, false, mop);
do_fp_ld(s, a->rt, clean_addr, mop);
tcg_gen_addi_i64(clean_addr, clean_addr, 1 << a->sz);
do_fp_ld(s, a->rt2, clean_addr, mop);
op_addr_ldstpair_post(s, a, dirty_addr, offset);
return true;
}
static bool trans_STGP(DisasContext *s, arg_ldstpair *a)
{
TCGv_i64 clean_addr, dirty_addr, tcg_rt, tcg_rt2;
uint64_t offset = a->imm << LOG2_TAG_GRANULE;
MemOp mop;
TCGv_i128 tmp;
if (!dc_isar_feature(aa64_mte_insn_reg, s)) {
return false;
}
if (a->rn == 31) {
gen_check_sp_alignment(s);
}
dirty_addr = read_cpu_reg_sp(s, a->rn, 1);
if (!a->p) {
tcg_gen_addi_i64(dirty_addr, dirty_addr, offset);
}
if (set_tag) {
if (!s->ata) {
/*
* TODO: We could rely on the stores below, at least for
* system mode, if we arrange to add MO_ALIGN_16.
*/
gen_helper_stg_stub(cpu_env, dirty_addr);
} else if (tb_cflags(s->base.tb) & CF_PARALLEL) {
gen_helper_stg_parallel(cpu_env, dirty_addr, dirty_addr);
} else {
gen_helper_stg(cpu_env, dirty_addr, dirty_addr);
}
}
if (is_vector) {
mop = finalize_memop_asimd(s, size);
} else {
mop = finalize_memop(s, size);
}
clean_addr = gen_mte_checkN(s, dirty_addr, !is_load,
(wback || rn != 31) && !set_tag,
2 << size, mop);
if (is_vector) {
/* LSE2 does not merge FP pairs; leave these as separate operations. */
if (is_load) {
do_fp_ld(s, rt, clean_addr, mop);
} else {
do_fp_st(s, rt, clean_addr, mop);
}
tcg_gen_addi_i64(clean_addr, clean_addr, 1 << size);
if (is_load) {
do_fp_ld(s, rt2, clean_addr, mop);
} else {
do_fp_st(s, rt2, clean_addr, mop);
}
} else {
TCGv_i64 tcg_rt = cpu_reg(s, rt);
TCGv_i64 tcg_rt2 = cpu_reg(s, rt2);
if (!s->ata) {
/*
* We built mop above for the single logical access -- rebuild it
* now for the paired operation.
*
* With LSE2, non-sign-extending pairs are treated atomically if
* aligned, and if unaligned one of the pair will be completely
* within a 16-byte block and that element will be atomic.
* Otherwise each element is separately atomic.
* In all cases, issue one operation with the correct atomicity.
*
* This treats sign-extending loads like zero-extending loads,
* since that reuses the most code below.
* TODO: We could rely on the stores below, at least for
* system mode, if we arrange to add MO_ALIGN_16.
*/
mop = size + 1;
if (s->align_mem) {
mop |= (size == 2 ? MO_ALIGN_4 : MO_ALIGN_8);
}
mop = finalize_memop_pair(s, mop);
if (is_load) {
if (size == 2) {
int o2 = s->be_data == MO_LE ? 32 : 0;
int o1 = o2 ^ 32;
tcg_gen_qemu_ld_i64(tcg_rt, clean_addr, get_mem_index(s), mop);
if (is_signed) {
tcg_gen_sextract_i64(tcg_rt2, tcg_rt, o2, 32);
tcg_gen_sextract_i64(tcg_rt, tcg_rt, o1, 32);
} else {
tcg_gen_extract_i64(tcg_rt2, tcg_rt, o2, 32);
tcg_gen_extract_i64(tcg_rt, tcg_rt, o1, 32);
}
} else {
TCGv_i128 tmp = tcg_temp_new_i128();
tcg_gen_qemu_ld_i128(tmp, clean_addr, get_mem_index(s), mop);
if (s->be_data == MO_LE) {
tcg_gen_extr_i128_i64(tcg_rt, tcg_rt2, tmp);
} else {
tcg_gen_extr_i128_i64(tcg_rt2, tcg_rt, tmp);
}
}
} else {
if (size == 2) {
TCGv_i64 tmp = tcg_temp_new_i64();
if (s->be_data == MO_LE) {
tcg_gen_concat32_i64(tmp, tcg_rt, tcg_rt2);
} else {
tcg_gen_concat32_i64(tmp, tcg_rt2, tcg_rt);
}
tcg_gen_qemu_st_i64(tmp, clean_addr, get_mem_index(s), mop);
} else {
TCGv_i128 tmp = tcg_temp_new_i128();
if (s->be_data == MO_LE) {
tcg_gen_concat_i64_i128(tmp, tcg_rt, tcg_rt2);
} else {
tcg_gen_concat_i64_i128(tmp, tcg_rt2, tcg_rt);
}
tcg_gen_qemu_st_i128(tmp, clean_addr, get_mem_index(s), mop);
}
}
gen_helper_stg_stub(cpu_env, dirty_addr);
} else if (tb_cflags(s->base.tb) & CF_PARALLEL) {
gen_helper_stg_parallel(cpu_env, dirty_addr, dirty_addr);
} else {
gen_helper_stg(cpu_env, dirty_addr, dirty_addr);
}
if (wback) {
if (postindex) {
tcg_gen_addi_i64(dirty_addr, dirty_addr, offset);
}
tcg_gen_mov_i64(cpu_reg_sp(s, rn), dirty_addr);
mop = finalize_memop(s, a->sz);
clean_addr = gen_mte_checkN(s, dirty_addr, true, false, 2 << a->sz, mop);
tcg_rt = cpu_reg(s, a->rt);
tcg_rt2 = cpu_reg(s, a->rt2);
assert(a->sz == 3);
tmp = tcg_temp_new_i128();
if (s->be_data == MO_LE) {
tcg_gen_concat_i64_i128(tmp, tcg_rt, tcg_rt2);
} else {
tcg_gen_concat_i64_i128(tmp, tcg_rt2, tcg_rt);
}
tcg_gen_qemu_st_i128(tmp, clean_addr, get_mem_index(s), mop);
op_addr_ldstpair_post(s, a, dirty_addr, offset);
return true;
}
/*
@ -4184,10 +4180,6 @@ static void disas_ldst_tag(DisasContext *s, uint32_t insn)
static void disas_ldst(DisasContext *s, uint32_t insn)
{
switch (extract32(insn, 24, 6)) {
case 0x28: case 0x29:
case 0x2c: case 0x2d: /* Load/store pair (all forms) */
disas_ldst_pair(s, insn);
break;
case 0x38: case 0x39:
case 0x3c: case 0x3d: /* Load/store register (all forms) */
disas_ldst_reg(s, insn);