[Qemu-devel] [PATCH v2 09/26] target/arm: Suppress tag check for sp+offset

[Richard Henderson]

R0078 specifies that base register, or base register plus immediate
offset, is unchecked when the base register is SP.

Signed-off-by: Richard Henderson <address@hidden>
---
v2: Include writeback addresses as checked.
---
 target/arm/translate-a64.c | 37 ++++++++++++++++++-------------------
 1 file changed, 18 insertions(+), 19 deletions(-)

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 8e9f40f2a6..d0f8c314c9 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -340,12 +340,11 @@ static void gen_a64_set_pc(DisasContext *s, TCGv_i64 src)
  * This is always a fresh temporary, as we need to be able to
  * increment this independently of a dirty write-back address.
  */
-static TCGv_i64 clean_data_tbi(DisasContext *s, TCGv_i64 addr)
+static TCGv_i64 clean_data_tbi(DisasContext *s, TCGv_i64 addr, bool check)
 {
     TCGv_i64 clean = new_tmp_a64(s);
 
-    /* FIXME: SP+OFS is always unchecked.  */
-    if (s->tbid && s->mte_active) {
+    if (check && s->mte_active) {
         gen_helper_mte_check(clean, cpu_env, addr);
     } else {
         gen_top_byte_ignore(s, clean, addr, s->tbid);
@@ -2379,7 +2378,7 @@ 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 = clean_data_tbi(s, cpu_reg_sp(s, rn), rn != 31);
     tcg_gen_atomic_cmpxchg_i64(tcg_rs, clean_addr, tcg_rs, tcg_rt, memidx,
                                size | MO_ALIGN | s->be_data);
 }
@@ -2397,7 +2396,7 @@ 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));
+    clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn), rn != 31);
 
     if (size == 2) {
         TCGv_i64 cmp = tcg_temp_new_i64();
@@ -2522,7 +2521,7 @@ static void disas_ldst_excl(DisasContext *s, uint32_t 
insn)
         if (is_lasr) {
             tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
         }
-        clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
+        clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn), rn != 31);
         gen_store_exclusive(s, rs, rt, rt2, clean_addr, size, false);
         return;
 
@@ -2531,7 +2530,7 @@ 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 = clean_data_tbi(s, cpu_reg_sp(s, rn), rn != 31);
         s->is_ldex = true;
         gen_load_exclusive(s, rt, rt2, clean_addr, size, false);
         if (is_lasr) {
@@ -2551,7 +2550,7 @@ static void disas_ldst_excl(DisasContext *s, uint32_t 
insn)
             gen_check_sp_alignment(s);
         }
         tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
-        clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
+        clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn), rn != 31);
         do_gpr_st(s, cpu_reg(s, rt), clean_addr, size, true, rt,
                   disas_ldst_compute_iss_sf(size, false, 0), is_lasr);
         return;
@@ -2567,7 +2566,7 @@ 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 = clean_data_tbi(s, cpu_reg_sp(s, rn), rn != 31);
         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_MO_ALL | TCG_BAR_LDAQ);
@@ -2581,7 +2580,7 @@ static void disas_ldst_excl(DisasContext *s, uint32_t 
insn)
             if (is_lasr) {
                 tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
             }
-            clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn));
+            clean_addr = clean_data_tbi(s, cpu_reg_sp(s, rn), rn != 31);
             gen_store_exclusive(s, rs, rt, rt2, clean_addr, size, true);
             return;
         }
@@ -2599,7 +2598,7 @@ 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 = clean_data_tbi(s, cpu_reg_sp(s, rn), rn != 31);
             s->is_ldex = true;
             gen_load_exclusive(s, rt, rt2, clean_addr, size, true);
             if (is_lasr) {
@@ -2789,7 +2788,7 @@ static void disas_ldst_pair(DisasContext *s, uint32_t 
insn)
     if (!postindex) {
         tcg_gen_addi_i64(dirty_addr, dirty_addr, offset);
     }
-    clean_addr = clean_data_tbi(s, dirty_addr);
+    clean_addr = clean_data_tbi(s, dirty_addr, wback || rn != 31);
 
     if (is_vector) {
         if (is_load) {
@@ -2927,7 +2926,7 @@ static void disas_ldst_reg_imm9(DisasContext *s, uint32_t 
insn,
     if (!post_index) {
         tcg_gen_addi_i64(dirty_addr, dirty_addr, imm9);
     }
-    clean_addr = clean_data_tbi(s, dirty_addr);
+    clean_addr = clean_data_tbi(s, dirty_addr, writeback || rn != 31);
 
     if (is_vector) {
         if (is_store) {
@@ -3034,7 +3033,7 @@ static void disas_ldst_reg_roffset(DisasContext *s, 
uint32_t insn,
     ext_and_shift_reg(tcg_rm, tcg_rm, opt, shift ? size : 0);
 
     tcg_gen_add_i64(dirty_addr, dirty_addr, tcg_rm);
-    clean_addr = clean_data_tbi(s, dirty_addr);
+    clean_addr = clean_data_tbi(s, dirty_addr, true);
 
     if (is_vector) {
         if (is_store) {
@@ -3119,7 +3118,7 @@ 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(dirty_addr, dirty_addr, offset);
-    clean_addr = clean_data_tbi(s, dirty_addr);
+    clean_addr = clean_data_tbi(s, dirty_addr, rn != 31);
 
     if (is_vector) {
         if (is_store) {
@@ -3203,7 +3202,7 @@ 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 = clean_data_tbi(s, cpu_reg_sp(s, rn), rn != 31);
     tcg_rs = read_cpu_reg(s, rs, true);
 
     if (o3_opc == 1) { /* LDCLR */
@@ -3265,7 +3264,7 @@ static void disas_ldst_pac(DisasContext *s, uint32_t insn,
     tcg_gen_addi_i64(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 = clean_data_tbi(s, dirty_addr, is_wback || rn != 31);
 
     tcg_rt = cpu_reg(s, rt);
     do_gpr_ld(s, tcg_rt, clean_addr, size, /* is_signed */ false,
@@ -3425,7 +3424,7 @@ static void disas_ldst_multiple_struct(DisasContext *s, 
uint32_t insn)
     elements = (is_q ? 16 : 8) / ebytes;
 
     tcg_rn = cpu_reg_sp(s, rn);
-    clean_addr = clean_data_tbi(s, tcg_rn);
+    clean_addr = clean_data_tbi(s, tcg_rn, is_postidx || rn != 31);
     tcg_ebytes = tcg_const_i64(ebytes);
 
     for (r = 0; r < rpt; r++) {
@@ -3568,7 +3567,7 @@ static void disas_ldst_single_struct(DisasContext *s, 
uint32_t insn)
     }
 
     tcg_rn = cpu_reg_sp(s, rn);
-    clean_addr = clean_data_tbi(s, tcg_rn);
+    clean_addr = clean_data_tbi(s, tcg_rn, is_postidx || rn != 31);
     tcg_ebytes = tcg_const_i64(ebytes);
 
     for (xs = 0; xs < selem; xs++) {
-- 
2.17.2