[PULL 30/41] target/ppc: Move lmw, stmw instructions to decodetree

[Harsh Prateek Bora <harshpb@linux.ibm.com>]

From: Tanushree Shah <tshah@linux.ibm.com>

Moving the following instructions to decodetree specification:
 lmw  : D-form
 stmw : D-form

The changes were verified by validating that the tcg ops generated by
those instructions remain the same, which were captured with the
"-d in_asm,op" flag.

Additionally, validated using small assembly tests confirming the
the correct register store/load behavior. Also, confirmed the
register values are same before and after the change.

Signed-off-by: Tanushree Shah <tshah@linux.ibm.com>
Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Reviewed-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Tested-by: Aniket Sahu <asahu1x@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20260827133010.278889-27-rathc@linux.ibm.com
Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
---
 target/ppc/helper.h                        |  4 +--
 target/ppc/insn32.decode                   |  3 ++
 target/ppc/mem_helper.c                    |  4 +--
 target/ppc/translate.c                     | 39 ----------------------
 target/ppc/translate/fixedpoint-impl.c.inc | 32 ++++++++++++++++++
 5 files changed, 39 insertions(+), 43 deletions(-)

diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 7da752c69b..ec3350fee8 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -43,8 +43,8 @@ DEF_HELPER_1(check_tlb_flush_local, void, env)
 DEF_HELPER_1(check_tlb_flush_global, void, env)
 #endif
 
-DEF_HELPER_3(lmw, void, env, tl, i32)
-DEF_HELPER_FLAGS_3(stmw, TCG_CALL_NO_WG, void, env, tl, i32)
+DEF_HELPER_3(LMW, void, env, tl, i32)
+DEF_HELPER_FLAGS_3(STMW, TCG_CALL_NO_WG, void, env, tl, i32)
 DEF_HELPER_4(LSW, void, env, tl, i32, i32)
 DEF_HELPER_5(LSWX, void, env, tl, i32, i32, i32)
 DEF_HELPER_FLAGS_4(STSW, TCG_CALL_NO_WG, void, env, tl, i32, i32)
diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index 92ee278f63..ef128f63c1 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -354,6 +354,7 @@ LVDX            011111 ..... ..... ..... 0000010001 -   @X
 LSKU            111010 ..... ..... ............. 0 11   @DD
 LCXU            111010 ..... ..... ............. 1 11   @DD
 
+LMW             101110 ..... ..... ................     @D
 
 ### Fixed-Point Atomic Load/Store Instructions
 
@@ -399,6 +400,8 @@ STBCIX          011111 ..... ..... ..... 1111010101 -   @X
 STHBRX          011111 ..... ..... ..... 1110010110 -   @X
 STWBRX          011111 ..... ..... ..... 1010010110 -   @X
 
+STMW            101111 ..... ..... ................     @D
+
 ### Fixed-Point Compare Instructions
 
 CMP             011111 ... - . ..... ..... 0000000000 - @X_bfl
diff --git a/target/ppc/mem_helper.c b/target/ppc/mem_helper.c
index 10c648cf06..dc5eab8c76 100644
--- a/target/ppc/mem_helper.c
+++ b/target/ppc/mem_helper.c
@@ -73,7 +73,7 @@ static void *probe_contiguous(CPUPPCState *env, target_ulong addr, uint32_t nb,
     return NULL;
 }
 
-void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
+void helper_LMW(CPUPPCState *env, target_ulong addr, uint32_t reg)
 {
     uintptr_t raddr = GETPC();
     int mmu_idx = ppc_env_mmu_index(env, false);
@@ -98,7 +98,7 @@ void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
     }
 }
 
-void helper_stmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
+void helper_STMW(CPUPPCState *env, target_ulong addr, uint32_t reg)
 {
     uintptr_t raddr = GETPC();
     int mmu_idx = ppc_env_mmu_index(env, false);
diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index ce94f9e4e6..880915f3da 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -2455,43 +2455,6 @@ GEN_LDX(lwbr, ld32ur, 0x16, 0x10, PPC_INTEGER);
 GEN_LDX_E(ldbr, ld64ur_i64, 0x14, 0x10, PPC_NONE, PPC2_DBRX, CHK_NONE);
 #endif  /* TARGET_PPC64 */
 
-/***                    Integer load and store multiple                    ***/
-
-/* lmw */
-static void gen_lmw(DisasContext *ctx)
-{
-    TCGv t0;
-    TCGv_i32 t1;
-
-    if (ctx->le_mode) {
-        gen_align_no_le(ctx);
-        return;
-    }
-    gen_set_access_type(ctx, ACCESS_INT);
-    t0 = tcg_temp_new();
-    t1 = tcg_constant_i32(rD(ctx->opcode));
-    gen_addr_imm_index(ctx, t0, 0);
-    gen_helper_lmw(tcg_env, t0, t1);
-}
-
-/* stmw */
-static void gen_stmw(DisasContext *ctx)
-{
-    TCGv t0;
-    TCGv_i32 t1;
-
-    if (ctx->le_mode) {
-        gen_align_no_le(ctx);
-        return;
-    }
-    gen_set_access_type(ctx, ACCESS_INT);
-    t0 = tcg_temp_new();
-    t1 = tcg_constant_i32(rS(ctx->opcode));
-    gen_addr_imm_index(ctx, t0, 0);
-    gen_helper_stmw(tcg_env, t0, t1);
-}
-
-
 #if !defined(CONFIG_USER_ONLY)
 static inline void gen_check_tlb_flush(DisasContext *ctx, bool global)
 {
@@ -4695,8 +4658,6 @@ GEN_HANDLER(rlwnm, 0x17, 0xFF, 0xFF, 0x00000000, PPC_INTEGER),
 GEN_HANDLER_E(dform39, 0x39, 0xFF, 0xFF, 0x00000000, PPC_NONE, PPC2_ISA205),
 /* handles stfdp, stxsd, stxssp */
 GEN_HANDLER_E(dform3D, 0x3D, 0xFF, 0xFF, 0x00000000, PPC_NONE, PPC2_ISA205),
-GEN_HANDLER(lmw, 0x2E, 0xFF, 0xFF, 0x00000000, PPC_INTEGER),
-GEN_HANDLER(stmw, 0x2F, 0xFF, 0xFF, 0x00000000, PPC_INTEGER),
 /* ISA v3.0 changed the extended opcode from 62 to 30 */
 GEN_HANDLER(rfi, 0x13, 0x12, 0x01, 0x03FF8001, PPC_FLOW),
 #if defined(TARGET_PPC64)
diff --git a/target/ppc/translate/fixedpoint-impl.c.inc b/target/ppc/translate/fixedpoint-impl.c.inc
index efef56a119..8475205f14 100644
--- a/target/ppc/translate/fixedpoint-impl.c.inc
+++ b/target/ppc/translate/fixedpoint-impl.c.inc
@@ -288,6 +288,38 @@ static bool trans_STQCX(DisasContext *ctx, arg_STQCX *a)
     return true;
 }
 
+/* Load/Store Multiple Word */
+static bool do_ldst_multiple(DisasContext *ctx, arg_D *a, bool store)
+{
+    TCGv ea;
+    TCGv_i32 reg;
+
+    REQUIRE_INSNS_FLAGS(ctx, INTEGER);
+
+    /* Little-endian mode is not supported for multiple word operations */
+    if (ctx->le_mode) {
+        gen_align_no_le(ctx);
+        return true;
+    }
+
+    gen_set_access_type(ctx, ACCESS_INT);
+
+    reg = tcg_constant_i32(a->rt);
+    ea = do_ea_calc(ctx, a->ra, tcg_constant_tl(a->si));
+
+    /* Call the appropriate helper function */
+    if (store) {
+        gen_helper_STMW(tcg_env, ea, reg);
+    } else {
+        gen_helper_LMW(tcg_env, ea, reg);
+    }
+
+    return true;
+}
+
+TRANS(LMW, do_ldst_multiple, false)
+TRANS(STMW, do_ldst_multiple, true)
+
 /*
  * Fixed-Point Compare Instructions
  */
-- 
2.52.0