[PULL 10/41] target/ppc: Move st{b, h, w, d, q}cx instructions to decodetree

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

From: Utkarsh Verma <uverma@linux.ibm.com>

Move the following store conditional instructions to decodetree
specification:

stbcx.	: X-form
sthcx.	: X-form
stwcx.	: X-form
stdcx.	: X-form
stqcx.	: X-form

The changes were verified by checking that the generated TCG ops remain
semantically identical to the legacy translation, using logs captured
with the -d in_asm,op flag.

Signed-off-by: Utkarsh Verma <uverma@linux.ibm.com>
Reviewed-by: Nikhil Kumar Singh <nikhilks@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/20260827133010.278889-7-rathc@linux.ibm.com
Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
---
 target/ppc/insn32.decode                   |   8 ++
 target/ppc/translate.c                     | 103 ---------------------
 target/ppc/translate/fixedpoint-impl.c.inc |  84 +++++++++++++++++
 3 files changed, 92 insertions(+), 103 deletions(-)

diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index d6f1875532..824181eb4e 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -732,6 +732,14 @@ DSCLIQ          111111 ..... ..... ...... 001000010 .   @Z22_tap_sh_rc
 DSCRI           111011 ..... ..... ...... 001100010 .   @Z22_ta_sh_rc
 DSCRIQ          111111 ..... ..... ...... 001100010 .   @Z22_tap_sh_rc
 
+### Store Conditional Instructions
+
+STBCX           011111 ..... ..... ..... 1010110110 1   @X
+STHCX           011111 ..... ..... ..... 1011010110 1   @X
+STWCX           011111 ..... ..... ..... 0010010110 1   @X
+STDCX           011111 ..... ..... ..... 0011010110 1   @X
+STQCX           011111 ..... ..... ..... 0010110110 1   @X
+
 ## Vector Exclusive-OR-based Instructions
 
 VPMSUMD         000100 ..... ..... ..... 10011001000    @VX
diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 4bd7f44b3c..821363e7fb 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -3153,104 +3153,6 @@ static void gen_stdat(DisasContext *ctx)
 }
 #endif
 
-static void gen_conditional_store(DisasContext *ctx, MemOp memop)
-{
-    TCGLabel *lfail;
-    TCGv EA;
-    TCGv cr0;
-    TCGv t0;
-    int rs = rS(ctx->opcode);
-
-    lfail = gen_new_label();
-    EA = tcg_temp_new();
-    cr0 = tcg_temp_new();
-    t0 = tcg_temp_new();
-
-    tcg_gen_mov_tl(cr0, cpu_so);
-    gen_set_access_type(ctx, ACCESS_RES);
-    gen_addr_reg_index(ctx, EA);
-    tcg_gen_brcond_tl(TCG_COND_NE, EA, cpu_reserve, lfail);
-    tcg_gen_brcondi_tl(TCG_COND_NE, cpu_reserve_length, memop_size(memop), lfail);
-
-    tcg_gen_atomic_cmpxchg_tl(t0, cpu_reserve, cpu_reserve_val,
-                              cpu_gpr[rs], ctx->mem_idx,
-                              DEF_MEMOP(memop) | MO_ALIGN);
-    tcg_gen_setcond_tl(TCG_COND_EQ, t0, t0, cpu_reserve_val);
-    tcg_gen_shli_tl(t0, t0, CRF_EQ_BIT);
-    tcg_gen_or_tl(cr0, cr0, t0);
-
-    gen_set_label(lfail);
-    tcg_gen_trunc_tl_i32(cpu_crf[0], cr0);
-    tcg_gen_movi_tl(cpu_reserve, -1);
-}
-
-#define STCX(name, memop)                  \
-static void gen_##name(DisasContext *ctx)  \
-{                                          \
-    gen_conditional_store(ctx, memop);     \
-}
-
-STCX(stbcx_, MO_UB)
-STCX(sthcx_, MO_UW)
-STCX(stwcx_, MO_UL)
-
-#if defined(TARGET_PPC64)
-/* stdcx. */
-STCX(stdcx_, MO_UQ)
-
-/* stqcx. */
-static void gen_stqcx_(DisasContext *ctx)
-{
-    TCGLabel *lfail;
-    TCGv EA, t0, t1;
-    TCGv cr0;
-    TCGv_i128 cmp, val;
-    int rs = rS(ctx->opcode);
-
-    if (unlikely(rs & 1)) {
-        gen_inval_exception(ctx, POWERPC_EXCP_INVAL_INVAL);
-        return;
-    }
-
-    lfail = gen_new_label();
-    EA = tcg_temp_new();
-    cr0 = tcg_temp_new();
-
-    tcg_gen_mov_tl(cr0, cpu_so);
-    gen_set_access_type(ctx, ACCESS_RES);
-    gen_addr_reg_index(ctx, EA);
-    tcg_gen_brcond_tl(TCG_COND_NE, EA, cpu_reserve, lfail);
-    tcg_gen_brcondi_tl(TCG_COND_NE, cpu_reserve_length, 16, lfail);
-
-    cmp = tcg_temp_new_i128();
-    val = tcg_temp_new_i128();
-
-    tcg_gen_concat_i64_i128(cmp, cpu_reserve_val2, cpu_reserve_val);
-
-    /* Note that the low part is always in RS+1, even in LE mode.  */
-    tcg_gen_concat_i64_i128(val, cpu_gpr[rs + 1], cpu_gpr[rs]);
-
-    tcg_gen_atomic_cmpxchg_i128(val, cpu_reserve, cmp, val, ctx->mem_idx,
-                                DEF_MEMOP(MO_128 | MO_ALIGN));
-
-    t0 = tcg_temp_new();
-    t1 = tcg_temp_new();
-    tcg_gen_extr_i128_i64(t1, t0, val);
-
-    tcg_gen_xor_tl(t1, t1, cpu_reserve_val2);
-    tcg_gen_xor_tl(t0, t0, cpu_reserve_val);
-    tcg_gen_or_tl(t0, t0, t1);
-
-    tcg_gen_setcondi_tl(TCG_COND_EQ, t0, t0, 0);
-    tcg_gen_shli_tl(t0, t0, CRF_EQ_BIT);
-    tcg_gen_or_tl(cr0, cr0, t0);
-
-    gen_set_label(lfail);
-    tcg_gen_trunc_tl_i32(cpu_crf[0], cr0);
-    tcg_gen_movi_tl(cpu_reserve, -1);
-}
-#endif /* defined(TARGET_PPC64) */
-
 /* wait */
 static void gen_wait(DisasContext *ctx)
 {
@@ -5886,14 +5788,9 @@ GEN_HANDLER(stswx, 0x1F, 0x15, 0x14, 0x00000001, PPC_STRING),
 GEN_HANDLER(isync, 0x13, 0x16, 0x04, 0x03FFF801, PPC_MEM),
 GEN_HANDLER_E(lwat, 0x1F, 0x06, 0x12, 0x00000001, PPC_NONE, PPC2_ISA300),
 GEN_HANDLER_E(stwat, 0x1F, 0x06, 0x16, 0x00000001, PPC_NONE, PPC2_ISA300),
-GEN_HANDLER_E(stbcx_, 0x1F, 0x16, 0x15, 0, PPC_NONE, PPC2_ATOMIC_ISA206),
-GEN_HANDLER_E(sthcx_, 0x1F, 0x16, 0x16, 0, PPC_NONE, PPC2_ATOMIC_ISA206),
-GEN_HANDLER2(stwcx_, "stwcx.", 0x1F, 0x16, 0x04, 0x00000000, PPC_RES),
 #if defined(TARGET_PPC64)
 GEN_HANDLER_E(ldat, 0x1F, 0x06, 0x13, 0x00000001, PPC_NONE, PPC2_ISA300),
 GEN_HANDLER_E(stdat, 0x1F, 0x06, 0x17, 0x00000001, PPC_NONE, PPC2_ISA300),
-GEN_HANDLER2(stdcx_, "stdcx.", 0x1F, 0x16, 0x06, 0x00000000, PPC_64B),
-GEN_HANDLER_E(stqcx_, 0x1F, 0x16, 0x05, 0, PPC_NONE, PPC2_LSQ_ISA207),
 #endif
 /* ISA v3.0 changed the extended opcode from 62 to 30 */
 GEN_HANDLER(wait, 0x1F, 0x1E, 0x01, 0x039FF801, PPC_WAIT),
diff --git a/target/ppc/translate/fixedpoint-impl.c.inc b/target/ppc/translate/fixedpoint-impl.c.inc
index fa0191e866..91f9c6c391 100644
--- a/target/ppc/translate/fixedpoint-impl.c.inc
+++ b/target/ppc/translate/fixedpoint-impl.c.inc
@@ -204,6 +204,90 @@ TRANS64(PSTD, do_ldst_PLS_D, false, true, MO_UQ)
 TRANS64(STQ, do_ldst_quad, true, false);
 TRANS64(PSTQ, do_ldst_quad_PLS_D, true);
 
+/* Store Conditional Instructions */
+
+static bool do_store_cond(DisasContext *ctx, arg_X *a, MemOp mop)
+{
+    TCGLabel *lfail = gen_new_label();
+    TCGv ea = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
+    TCGv cr0 = tcg_temp_new();
+    TCGv t0 = tcg_temp_new();
+
+    tcg_gen_mov_tl(cr0, cpu_so);
+    gen_set_access_type(ctx, ACCESS_RES);
+
+    tcg_gen_brcond_tl(TCG_COND_NE, ea, cpu_reserve, lfail);
+    tcg_gen_brcondi_tl(TCG_COND_NE, cpu_reserve_length, memop_size(mop), lfail);
+
+    tcg_gen_atomic_cmpxchg_tl(t0, cpu_reserve, cpu_reserve_val,
+                              cpu_gpr[a->rt], ctx->mem_idx,
+                              DEF_MEMOP(mop) | MO_ALIGN);
+    tcg_gen_setcond_tl(TCG_COND_EQ, t0, t0, cpu_reserve_val);
+    tcg_gen_shli_tl(t0, t0, CRF_EQ_BIT);
+    tcg_gen_or_tl(cr0, cr0, t0);
+
+    gen_set_label(lfail);
+    tcg_gen_trunc_tl_i32(cpu_crf[0], cr0);
+    tcg_gen_movi_tl(cpu_reserve, -1);
+    return true;
+}
+
+TRANS_FLAGS2(ATOMIC_ISA206, STBCX, do_store_cond, MO_UB);
+TRANS_FLAGS2(ATOMIC_ISA206, STHCX, do_store_cond, MO_UW);
+TRANS(STWCX, do_store_cond, MO_UL);
+TRANS64(STDCX, do_store_cond, MO_UQ);
+
+static bool trans_STQCX(DisasContext *ctx, arg_STQCX *a)
+{
+    REQUIRE_64BIT(ctx);
+    REQUIRE_INSNS_FLAGS2(ctx, LSQ_ISA207);
+#if defined(TARGET_PPC64)
+    TCGLabel *lfail = gen_new_label();
+    TCGv ea = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
+    TCGv t0 = tcg_temp_new();
+    TCGv t1 = tcg_temp_new();
+    TCGv cr0 = tcg_temp_new();
+    TCGv_i128 cmp = tcg_temp_new_i128();
+    TCGv_i128 val = tcg_temp_new_i128();
+
+    if (unlikely(a->rt & 1)) {
+        gen_invalid(ctx);
+        return true;
+    }
+
+    tcg_gen_mov_tl(cr0, cpu_so);
+    gen_set_access_type(ctx, ACCESS_RES);
+
+    tcg_gen_brcond_tl(TCG_COND_NE, ea, cpu_reserve, lfail);
+    tcg_gen_brcondi_tl(TCG_COND_NE, cpu_reserve_length, 16, lfail);
+
+    tcg_gen_concat_i64_i128(cmp, cpu_reserve_val2, cpu_reserve_val);
+
+    /* Note that the low part is always in RS+1, even in LE mode.  */
+    tcg_gen_concat_i64_i128(val, cpu_gpr[a->rt + 1], cpu_gpr[a->rt]);
+
+    tcg_gen_atomic_cmpxchg_i128(val, cpu_reserve, cmp, val, ctx->mem_idx,
+                                DEF_MEMOP(MO_128 | MO_ALIGN));
+
+    tcg_gen_extr_i128_i64(t1, t0, val);
+
+    tcg_gen_xor_tl(t1, t1, cpu_reserve_val2);
+    tcg_gen_xor_tl(t0, t0, cpu_reserve_val);
+    tcg_gen_or_tl(t0, t0, t1);
+
+    tcg_gen_setcondi_tl(TCG_COND_EQ, t0, t0, 0);
+    tcg_gen_shli_tl(t0, t0, CRF_EQ_BIT);
+    tcg_gen_or_tl(cr0, cr0, t0);
+
+    gen_set_label(lfail);
+    tcg_gen_trunc_tl_i32(cpu_crf[0], cr0);
+    tcg_gen_movi_tl(cpu_reserve, -1);
+#else
+    qemu_build_not_reached();
+#endif
+    return true;
+}
+
 /*
  * Fixed-Point Compare Instructions
  */
-- 
2.52.0