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target/arm: Add gen_mte_check1

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Replace existing uses of check_data_tbi in translate-a64.c that
perform a single logical memory access. Leave the helper blank
for now to reduce the patch size.

Backports commit 0a405be2b8fd9506a009b10d7d2d98c394b36db6 from qemu
This commit is contained in:
Richard Henderson 2021-02-25 16:11:22 -05:00 committed by Lioncash
parent 4488858072
commit 582e64f348
7 changed files with 95 additions and 24 deletions
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1
qemu/aarch64.h
View file

@ -3583,6 +3583,7 @@
#define helper_msr_i_daifclear helper_msr_i_daifclear_aarch64
#define helper_msr_i_daifset helper_msr_i_daifset_aarch64
#define helper_msr_i_spsel helper_msr_i_spsel_aarch64
#define helper_mte_check1 helper_mte_check1_aarch64
#define helper_neon_addlp_s16 helper_neon_addlp_s16_aarch64
#define helper_neon_addlp_s8 helper_neon_addlp_s8_aarch64
#define helper_neon_addlp_u16 helper_neon_addlp_u16_aarch64

1
qemu/aarch64eb.h
View file

@ -3583,6 +3583,7 @@
#define helper_msr_i_daifclear helper_msr_i_daifclear_aarch64eb
#define helper_msr_i_daifset helper_msr_i_daifset_aarch64eb
#define helper_msr_i_spsel helper_msr_i_spsel_aarch64eb
#define helper_mte_check1 helper_mte_check1_aarch64eb
#define helper_neon_addlp_s16 helper_neon_addlp_s16_aarch64eb
#define helper_neon_addlp_s8 helper_neon_addlp_s8_aarch64eb
#define helper_neon_addlp_u16 helper_neon_addlp_u16_aarch64eb

1
qemu/header_gen.py
View file

@ -3718,6 +3718,7 @@ aarch64_symbols = (
'helper_msr_i_daifclear',
'helper_msr_i_daifset',
'helper_msr_i_spsel',
'helper_mte_check1',
'helper_neon_addlp_s16',
'helper_neon_addlp_s8',
'helper_neon_addlp_u16',

1
qemu/target/arm/helper-a64.h
View file

@ -104,6 +104,7 @@ DEF_HELPER_FLAGS_3(autdb, TCG_CALL_NO_WG, i64, env, i64, i64)
DEF_HELPER_FLAGS_2(xpaci, TCG_CALL_NO_RWG_SE, i64, env, i64)
DEF_HELPER_FLAGS_2(xpacd, TCG_CALL_NO_RWG_SE, i64, env, i64)
DEF_HELPER_FLAGS_3(mte_check1, TCG_CALL_NO_WG, i64, env, i32, i64)
DEF_HELPER_FLAGS_3(irg, TCG_CALL_NO_RWG, i64, env, i64, i64)
DEF_HELPER_FLAGS_4(addsubg, TCG_CALL_NO_RWG_SE, i64, env, i64, s32, i32)
DEF_HELPER_FLAGS_3(ldg, TCG_CALL_NO_WG, i64, env, i64, i64)

8
qemu/target/arm/internals.h
View file

@ -1314,6 +1314,14 @@ bool get_phys_addr(CPUARMState *env, target_ulong address,
#define LOG2_TAG_GRANULE 4
#define TAG_GRANULE (1 << LOG2_TAG_GRANULE)
/* Bits within a descriptor passed to the helper_mte_check* functions. */
FIELD(MTEDESC, MIDX, 0, 4)
FIELD(MTEDESC, TBI, 4, 2)
FIELD(MTEDESC, TCMA, 6, 2)
FIELD(MTEDESC, WRITE, 8, 1)
FIELD(MTEDESC, ESIZE, 9, 5)
FIELD(MTEDESC, TSIZE, 14, 10) /* mte_checkN only */
static inline int allocation_tag_from_addr(uint64_t ptr)
{
return extract64(ptr, 56, 4);

8
qemu/target/arm/mte_helper.c
View file

@ -358,3 +358,11 @@ void HELPER(stzgm_tags)(CPUARMState *env, uint64_t ptr, uint64_t val)
memset(mem, tag_pair, tag_bytes);
}
}
/*
* Perform an MTE checked access for a single logical or atomic access.
*/
uint64_t HELPER(mte_check1)(CPUARMState *env, uint32_t desc, uint64_t ptr)
{
return ptr;
}

99
qemu/target/arm/translate-a64.c
View file

@ -341,20 +341,19 @@ static void gen_a64_set_pc(DisasContext *s, TCGv_i64 src)
}
/*
* Return a "clean" address for ADDR according to TBID.
* This is always a fresh temporary, as we need to be able to
* increment this independently of a dirty write-back address.
* Handle MTE and/or TBI.
*
* For TBI, ideally, we would do nothing. Proper behaviour on fault is
* for the tag to be present in the FAR_ELx register. But for user-only
* mode we do not have a TLB with which to implement this, so we must
* remove the top byte now.
*
* Always return a fresh temporary that we can increment independently
* of the write-back address.
*/
static TCGv_i64 clean_data_tbi(DisasContext *s, TCGv_i64 addr)
{
TCGv_i64 clean = new_tmp_a64(s);
/*
* In order to get the correct value in the FAR_ELx register,
* we must present the memory subsystem with the "dirty" address
* including the TBI. In system mode we can make this work via
* the TLB, dropping the TBI during translation. But for user-only
* mode we don't have that option, and must remove the top byte now.
*/
#ifdef CONFIG_USER_ONLY
gen_top_byte_ignore(s, clean, addr, s->tbid);
#else
@ -383,6 +382,45 @@ static void gen_probe_access(DisasContext *s, TCGv_i64 ptr,
tcg_temp_free_i32(tcg_ctx, t_size);
}
/*
* For MTE, check a single logical or atomic access. This probes a single
* address, the exact one specified. The size and alignment of the access
* is not relevant to MTE, per se, but watchpoints do require the size,
* and we want to recognize those before making any other changes to state.
*/
static TCGv_i64 gen_mte_check1_mmuidx(DisasContext *s, TCGv_i64 addr,
bool is_write, bool tag_checked,
int log2_size, bool is_unpriv,
int core_idx)
{
if (tag_checked && s->mte_active[is_unpriv]) {
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv_i32 tcg_desc;
TCGv_i64 ret;
int desc = 0;
desc = FIELD_DP32(desc, MTEDESC, MIDX, core_idx);
desc = FIELD_DP32(desc, MTEDESC, TBI, s->tbid);
desc = FIELD_DP32(desc, MTEDESC, TCMA, s->tcma);
desc = FIELD_DP32(desc, MTEDESC, WRITE, is_write);
desc = FIELD_DP32(desc, MTEDESC, ESIZE, 1 << log2_size);
tcg_desc = tcg_const_i32(tcg_ctx, desc);
ret = new_tmp_a64(s);
gen_helper_mte_check1(tcg_ctx, ret, tcg_ctx->cpu_env, tcg_desc, addr);
tcg_temp_free_i32(tcg_ctx, tcg_desc);
return ret;
}
return clean_data_tbi(s, addr);
}
static TCGv_i64 gen_mte_check1(DisasContext *s, TCGv_i64 addr, bool is_write,
bool tag_checked, int log2_size)
{
return gen_mte_check1_mmuidx(s, addr, is_write, tag_checked, log2_size,
false, get_mem_index(s));
}
typedef struct DisasCompare64 {
TCGCond cond;
@ -2555,7 +2593,7 @@ static void gen_compare_and_swap(DisasContext *s, int rs, int rt,
if (rn == 31) {
gen_check_sp_alignment(s);
}
clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn), true, rn != 31, size);
tcg_gen_atomic_cmpxchg_i64(tcg_ctx, tcg_rs, clean_addr, tcg_rs, tcg_rt, memidx,
size | MO_ALIGN | s->be_data);
}
@ -2574,7 +2612,9 @@ static void gen_compare_and_swap_pair(DisasContext *s, int rs, int rt,
if (rn == 31) {
gen_check_sp_alignment(s);
}
clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
/* This is a single atomic access, despite the "pair". */
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn), true, rn != 31, size + 1);
if (size == 2) {
TCGv_i64 cmp = tcg_temp_new_i64(tcg_ctx);
@ -2695,7 +2735,8 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
if (is_lasr) {
tcg_gen_mb(tcg_ctx, TCG_MO_ALL | TCG_BAR_STRL);
}
clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn),
true, rn != 31, size);
gen_store_exclusive(s, rs, rt, rt2, clean_addr, size, false);
return;
@ -2704,7 +2745,8 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
if (rn == 31) {
gen_check_sp_alignment(s);
}
clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn),
false, rn != 31, size);
s->is_ldex = true;
gen_load_exclusive(s, rt, rt2, clean_addr, size, false);
if (is_lasr) {
@ -2724,7 +2766,8 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
gen_check_sp_alignment(s);
}
tcg_gen_mb(tcg_ctx, TCG_MO_ALL | TCG_BAR_STRL);
clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn),
true, rn != 31, size);
do_gpr_st(s, cpu_reg(s, rt), clean_addr, size, true, rt,
disas_ldst_compute_iss_sf(size, false, 0), is_lasr);
return;
@ -2740,7 +2783,8 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
if (rn == 31) {
gen_check_sp_alignment(s);
}
clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn),
false, rn != 31, size);
do_gpr_ld(s, cpu_reg(s, rt), clean_addr, size, false, false, true, rt,
disas_ldst_compute_iss_sf(size, false, 0), is_lasr);
tcg_gen_mb(tcg_ctx, TCG_MO_ALL | TCG_BAR_LDAQ);
@ -2755,7 +2799,8 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
if (is_lasr) {
tcg_gen_mb(tcg_ctx, TCG_MO_ALL | TCG_BAR_STRL);
}
clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn),
true, rn != 31, size);
gen_store_exclusive(s, rs, rt, rt2, clean_addr, size, true);
return;
}
@ -2773,7 +2818,8 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
if (rn == 31) {
gen_check_sp_alignment(s);
}
clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn),
false, rn != 31, size);
s->is_ldex = true;
gen_load_exclusive(s, rt, rt2, clean_addr, size, true);
if (is_lasr) {
@ -3069,6 +3115,7 @@ static void disas_ldst_reg_imm9(DisasContext *s, uint32_t insn,
bool iss_valid = !is_vector;
bool post_index;
bool writeback;
int memidx;
TCGv_i64 clean_addr, dirty_addr;
@ -3126,7 +3173,11 @@ static void disas_ldst_reg_imm9(DisasContext *s, uint32_t insn,
if (!post_index) {
tcg_gen_addi_i64(tcg_ctx, dirty_addr, dirty_addr, imm9);
}
clean_addr = clean_data_tbi(s, dirty_addr);
memidx = is_unpriv ? get_a64_user_mem_index(s) : get_mem_index(s);
clean_addr = gen_mte_check1_mmuidx(s, dirty_addr, is_store,
writeback || rn != 31,
size, is_unpriv, memidx);
if (is_vector) {
if (is_store) {
@ -3136,7 +3187,6 @@ static void disas_ldst_reg_imm9(DisasContext *s, uint32_t insn,
}
} else {
TCGv_i64 tcg_rt = cpu_reg(s, rt);
int memidx = is_unpriv ? get_a64_user_mem_index(s) : get_mem_index(s);
bool iss_sf = disas_ldst_compute_iss_sf(size, is_signed, opc);
if (is_store) {
@ -3234,7 +3284,7 @@ static void disas_ldst_reg_roffset(DisasContext *s, uint32_t insn,
ext_and_shift_reg(s, tcg_rm, tcg_rm, opt, shift ? size : 0);
tcg_gen_add_i64(tcg_ctx, dirty_addr, dirty_addr, tcg_rm);
clean_addr = clean_data_tbi(s, dirty_addr);
clean_addr = gen_mte_check1(s, dirty_addr, is_store, true, size);
if (is_vector) {
if (is_store) {
@ -3320,7 +3370,7 @@ static void disas_ldst_reg_unsigned_imm(DisasContext *s, uint32_t insn,
dirty_addr = read_cpu_reg_sp(s, rn, 1);
offset = imm12 << size;
tcg_gen_addi_i64(tcg_ctx, dirty_addr, dirty_addr, offset);
clean_addr = clean_data_tbi(s, dirty_addr);
clean_addr = gen_mte_check1(s, dirty_addr, is_store, rn != 31, size);
if (is_vector) {
if (is_store) {
@ -3414,7 +3464,7 @@ static void disas_ldst_atomic(DisasContext *s, uint32_t insn,
if (rn == 31) {
gen_check_sp_alignment(s);
}
clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn), false, rn != 31, size);
if (o3_opc == 014) {
/*
@ -3493,7 +3543,8 @@ static void disas_ldst_pac(DisasContext *s, uint32_t insn,
tcg_gen_addi_i64(tcg_ctx, dirty_addr, dirty_addr, offset);
/* Note that "clean" and "dirty" here refer to TBI not PAC. */
clean_addr = clean_data_tbi(s, dirty_addr);
clean_addr = gen_mte_check1(s, dirty_addr, false,
is_wback || rn != 31, size);
tcg_rt = cpu_reg(s, rt);
do_gpr_ld(s, tcg_rt, clean_addr, size, /* is_signed */ false,