[PATCH] target/sparc: Use GET_ASI_CODE for ASI_KERNELTXT and ASI_USERTXT

[Richard Henderson <richard.henderson@linaro.org>]

Reads are done with execute access.  It is not clear whether writes
are legal at all -- for now, leave helper_st_asi unchanged, so that
we continue to raise an mmu fault.

This generalizes the exiting code for ASI_KERNELTXT to be usable for
ASI_USERTXT as well, by passing down the MemOpIdx to use.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2281
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2059
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1609
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1166
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/sparc/helper.h      |  3 ++
 target/sparc/ldst_helper.c | 65 ++++++++++++++++++++++++++------------
 target/sparc/translate.c   | 49 ++++++++++++++++++++++++++--
 3 files changed, 95 insertions(+), 22 deletions(-)

diff --git a/target/sparc/helper.h b/target/sparc/helper.h
index e55fad5b8c..b8087d0d2b 100644
--- a/target/sparc/helper.h
+++ b/target/sparc/helper.h
@@ -32,6 +32,9 @@ DEF_HELPER_FLAGS_3(udiv, TCG_CALL_NO_WG, i64, env, tl, tl)
 DEF_HELPER_FLAGS_3(sdiv, TCG_CALL_NO_WG, i64, env, tl, tl)
 DEF_HELPER_3(taddcctv, tl, env, tl, tl)
 DEF_HELPER_3(tsubcctv, tl, env, tl, tl)
+#if !defined(CONFIG_USER_ONLY) && !defined(TARGET_SPARC64)
+DEF_HELPER_FLAGS_3(ld_code, TCG_CALL_NO_WG, i64, env, tl, i32)
+#endif
 #if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
 DEF_HELPER_FLAGS_4(ld_asi, TCG_CALL_NO_WG, i64, env, tl, int, i32)
 DEF_HELPER_FLAGS_5(st_asi, TCG_CALL_NO_WG, void, env, tl, i64, int, i32)
diff --git a/target/sparc/ldst_helper.c b/target/sparc/ldst_helper.c
index e581bb42ac..2846a86cc4 100644
--- a/target/sparc/ldst_helper.c
+++ b/target/sparc/ldst_helper.c
@@ -585,7 +585,6 @@ uint64_t helper_ld_asi(CPUSPARCState *env, target_ulong addr,
 #if defined(DEBUG_MXCC) || defined(DEBUG_ASI)
     uint32_t last_addr = addr;
 #endif
-    MemOpIdx oi;
 
     do_check_align(env, addr, size - 1, GETPC());
     switch (asi) {
@@ -684,24 +683,6 @@ uint64_t helper_ld_asi(CPUSPARCState *env, target_ulong addr,
     case ASI_M_DIAGS:   /* Turbosparc DTLB Diagnostic */
     case ASI_M_IODIAG:  /* Turbosparc IOTLB Diagnostic */
         break;
-    case ASI_KERNELTXT: /* Supervisor code access */
-        oi = make_memop_idx(memop, cpu_mmu_index(env_cpu(env), true));
-        switch (size) {
-        case 1:
-            ret = cpu_ldb_code_mmu(env, addr, oi, GETPC());
-            break;
-        case 2:
-            ret = cpu_ldw_code_mmu(env, addr, oi, GETPC());
-            break;
-        default:
-        case 4:
-            ret = cpu_ldl_code_mmu(env, addr, oi, GETPC());
-            break;
-        case 8:
-            ret = cpu_ldq_code_mmu(env, addr, oi, GETPC());
-            break;
-        }
-        break;
     case ASI_M_TXTC_TAG:   /* SparcStation 5 I-cache tag */
     case ASI_M_TXTC_DATA:  /* SparcStation 5 I-cache data */
     case ASI_M_DATAC_TAG:  /* SparcStation 5 D-cache tag */
@@ -779,7 +760,6 @@ uint64_t helper_ld_asi(CPUSPARCState *env, target_ulong addr,
     case 0x4c: /* SuperSPARC MMU Breakpoint Action */
         ret = env->mmubpaction;
         break;
-    case ASI_USERTXT: /* User code access, XXX */
     default:
         sparc_raise_mmu_fault(cs, addr, false, false, asi, size, GETPC());
         ret = 0;
@@ -787,6 +767,8 @@ uint64_t helper_ld_asi(CPUSPARCState *env, target_ulong addr,
 
     case ASI_USERDATA: /* User data access */
     case ASI_KERNELDATA: /* Supervisor data access */
+    case ASI_USERTXT: /* User code access */
+    case ASI_KERNELTXT: /* Supervisor code access */
     case ASI_P: /* Implicit primary context data access (v9 only?) */
     case ASI_M_BYPASS:    /* MMU passthrough */
     case ASI_LEON_BYPASS: /* LEON MMU passthrough */
@@ -1161,6 +1143,49 @@ void helper_st_asi(CPUSPARCState *env, target_ulong addr, uint64_t val,
 #endif
 }
 
+uint64_t helper_ld_code(CPUSPARCState *env, target_ulong addr, uint32_t oi)
+{
+    MemOp mop = get_memop(oi);
+    uintptr_t ra = GETPC();
+    uint64_t ret;
+
+    switch (mop & MO_SIZE) {
+    case MO_8:
+        ret = cpu_ldb_code_mmu(env, addr, oi, ra);
+        if (mop & MO_SIGN) {
+            ret = (int8_t)ret;
+        }
+        break;
+    case MO_16:
+        ret = cpu_ldw_code_mmu(env, addr, oi, ra);
+        if ((mop & MO_BSWAP) != MO_TE) {
+            ret = bswap16(ret);
+        }
+        if (mop & MO_SIGN) {
+            ret = (int16_t)ret;
+        }
+        break;
+    case MO_32:
+        ret = cpu_ldl_code_mmu(env, addr, oi, ra);
+        if ((mop & MO_BSWAP) != MO_TE) {
+            ret = bswap32(ret);
+        }
+        if (mop & MO_SIGN) {
+            ret = (int32_t)ret;
+        }
+        break;
+    case MO_64:
+        ret = cpu_ldq_code_mmu(env, addr, oi, ra);
+        if ((mop & MO_BSWAP) != MO_TE) {
+            ret = bswap64(ret);
+        }
+        break;
+    default:
+        g_assert_not_reached();
+    }
+    return ret;
+}
+
 #endif /* CONFIG_USER_ONLY */
 #else /* TARGET_SPARC64 */
 
diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index 319934d9bd..c9b9b047df 100644
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -1117,6 +1117,7 @@ typedef enum {
     GET_ASI_EXCP,
     GET_ASI_DIRECT,
     GET_ASI_DTWINX,
+    GET_ASI_CODE,
     GET_ASI_BLOCK,
     GET_ASI_SHORT,
     GET_ASI_BCOPY,
@@ -1159,14 +1160,22 @@ static DisasASI resolve_asi(DisasContext *dc, int asi, MemOp memop)
                || (asi == ASI_USERDATA
                    && (dc->def->features & CPU_FEATURE_CASA))) {
         switch (asi) {
-        case ASI_USERDATA:   /* User data access */
+        case ASI_USERDATA:    /* User data access */
             mem_idx = MMU_USER_IDX;
             type = GET_ASI_DIRECT;
             break;
-        case ASI_KERNELDATA: /* Supervisor data access */
+        case ASI_KERNELDATA:  /* Supervisor data access */
             mem_idx = MMU_KERNEL_IDX;
             type = GET_ASI_DIRECT;
             break;
+        case ASI_USERTXT:     /* User text access */
+            mem_idx = MMU_USER_IDX;
+            type = GET_ASI_CODE;
+            break;
+        case ASI_KERNELTXT:   /* Supervisor text access */
+            mem_idx = MMU_KERNEL_IDX;
+            type = GET_ASI_CODE;
+            break;
         case ASI_M_BYPASS:    /* MMU passthrough */
         case ASI_LEON_BYPASS: /* LEON MMU passthrough */
             mem_idx = MMU_PHYS_IDX;
@@ -1379,6 +1388,22 @@ static void gen_ld_asi(DisasContext *dc, DisasASI *da, TCGv dst, TCGv addr)
     case GET_ASI_DIRECT:
         tcg_gen_qemu_ld_tl(dst, addr, da->mem_idx, da->memop | MO_ALIGN);
         break;
+
+    case GET_ASI_CODE:
+#if !defined(CONFIG_USER_ONLY) && !defined(TARGET_SPARC64)
+        {
+            MemOpIdx oi = make_memop_idx(da->memop, da->mem_idx);
+            TCGv_i32 r_oi = tcg_constant_i32(oi);
+            TCGv_i64 t64 = tcg_temp_new_i64();
+
+            gen_helper_ld_code(t64, tcg_env, addr, r_oi);
+            tcg_gen_trunc_i64_tl(dst, t64);
+        }
+        break;
+#else
+        g_assert_not_reached();
+#endif
+
     default:
         {
             TCGv_i32 r_asi = tcg_constant_i32(da->asi);
@@ -1791,6 +1816,26 @@ static void gen_ldda_asi(DisasContext *dc, DisasASI *da, TCGv addr, int rd)
         }
         break;
 
+    case GET_ASI_CODE:
+#if !defined(CONFIG_USER_ONLY) && !defined(TARGET_SPARC64)
+        {
+            TCGv_i64 tmp = tcg_temp_new_i64();
+            MemOpIdx oi = make_memop_idx(da->memop, da->mem_idx);
+
+            gen_helper_ld_code(tmp, tcg_env, addr, tcg_constant_i32(oi));
+
+            /* See above.  */
+            if ((da->memop & MO_BSWAP) == MO_TE) {
+                tcg_gen_extr_i64_tl(lo, hi, tmp);
+            } else {
+                tcg_gen_extr_i64_tl(hi, lo, tmp);
+            }
+        }
+        break;
+#else
+        g_assert_not_reached();
+#endif
+
     default:
         /* ??? In theory we've handled all of the ASIs that are valid
            for ldda, and this should raise DAE_invalid_asi.  However,
-- 
2.34.1