[Qemu-devel] [PATCH v3 41/69] target/arm: Convert SG

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

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/translate.c | 51 ++++++++++++++++++++++++------------------
 target/arm/t32.decode  |  5 ++++-
 2 files changed, 33 insertions(+), 23 deletions(-)

diff --git a/target/arm/translate.c b/target/arm/translate.c
index 92b3a66e05..52da7f4fa8 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -8441,6 +8441,34 @@ static bool trans_SMC(DisasContext *s, arg_SMC *a)
     return true;
 }
 
+static bool trans_SG(DisasContext *s, arg_SG *a)
+{
+    if (!arm_dc_feature(s, ARM_FEATURE_M) ||
+        !arm_dc_feature(s, ARM_FEATURE_V8)) {
+        return false;
+    }
+    /*
+     * SG (v8M only)
+     * The bulk of the behaviour for this instruction is implemented
+     * in v7m_handle_execute_nsc(), which deals with the insn when
+     * it is executed by a CPU in non-secure state from memory
+     * which is Secure & NonSecure-Callable.
+     * Here we only need to handle the remaining cases:
+     *  * in NS memory (including the "security extension not
+     *    implemented" case) : NOP
+     *  * in S memory but CPU already secure (clear IT bits)
+     * We know that the attribute for the memory this insn is
+     * in must match the current CPU state, because otherwise
+     * get_phys_addr_pmsav8 would have generated an exception.
+     */
+    if (s->v8m_secure) {
+        /* Like the IT insn, we don't need to generate any code */
+        s->condexec_cond = 0;
+        s->condexec_mask = 0;
+    }
+    return true;
+}
+
 /*
  * Load/store register index
  */
@@ -10530,28 +10558,7 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
              * - load/store doubleword, load/store exclusive, ldacq/strel,
              *   table branch, TT.
              */
-            if (insn == 0xe97fe97f && arm_dc_feature(s, ARM_FEATURE_M) &&
-                arm_dc_feature(s, ARM_FEATURE_V8)) {
-                /* 0b1110_1001_0111_1111_1110_1001_0111_111
-                 *  - SG (v8M only)
-                 * The bulk of the behaviour for this instruction is implemented
-                 * in v7m_handle_execute_nsc(), which deals with the insn when
-                 * it is executed by a CPU in non-secure state from memory
-                 * which is Secure & NonSecure-Callable.
-                 * Here we only need to handle the remaining cases:
-                 *  * in NS memory (including the "security extension not
-                 *    implemented" case) : NOP
-                 *  * in S memory but CPU already secure (clear IT bits)
-                 * We know that the attribute for the memory this insn is
-                 * in must match the current CPU state, because otherwise
-                 * get_phys_addr_pmsav8 would have generated an exception.
-                 */
-                if (s->v8m_secure) {
-                    /* Like the IT insn, we don't need to generate any code */
-                    s->condexec_cond = 0;
-                    s->condexec_mask = 0;
-                }
-            } else if (insn & 0x01200000) {
+            if (insn & 0x01200000) {
                 /* load/store dual, in decodetree */
                 goto illegal_op;
             } else if ((insn & (1 << 23)) == 0) {
diff --git a/target/arm/t32.decode b/target/arm/t32.decode
index 24482e0eeb..2b30a767fe 100644
--- a/target/arm/t32.decode
+++ b/target/arm/t32.decode
@@ -487,7 +487,10 @@ STRD_ri_t32      1110 1001 .100 .... .... .... ........    @ldstd_ri8 w=0 p=1
 LDRD_ri_t32      1110 1001 .101 .... .... .... ........    @ldstd_ri8 w=0 p=1
 
 STRD_ri_t32      1110 1001 .110 .... .... .... ........    @ldstd_ri8 w=1 p=1
-LDRD_ri_t32      1110 1001 .111 .... .... .... ........    @ldstd_ri8 w=1 p=1
+{
+  SG             1110 1001 0111 1111 1110 1001 01111111
+  LDRD_ri_t32    1110 1001 .111 .... .... .... ........    @ldstd_ri8 w=1 p=1
+}
 
 # Load/Store Exclusive, Load-Acquire/Store-Release, and Table Branch
 
-- 
2.17.1