tcg/ppc: Convert tcg_out_qemu_{ld,st}_slow_path

Use tcg_out_ld_helper_args, tcg_out_ld_helper_ret,
and tcg_out_st_helper_args.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/ppc/tcg-target.c.inc

@@ -2003,88 +2003,52 @@ static void * const qemu_st_helpers[(MO_SIZE | MO_BSWAP) + 1] = {
     [MO_BEUQ] = helper_be_stq_mmu,
 };
 
+static TCGReg ldst_ra_gen(TCGContext *s, const TCGLabelQemuLdst *l, int arg)
+{
+    if (arg < 0) {
+        arg = TCG_REG_TMP1;
+    }
+    tcg_out32(s, MFSPR | RT(arg) | LR);
+    return arg;
+}
+
+/*
+ * For the purposes of ppc32 sorting 4 input registers into 4 argument
+ * registers, there is an outside chance we would require 3 temps.
+ * Because of constraints, no inputs are in r3, and env will not be
+ * placed into r3 until after the sorting is done, and is thus free.
+ */
+static const TCGLdstHelperParam ldst_helper_param = {
+    .ra_gen = ldst_ra_gen,
+    .ntmp = 3,
+    .tmp = { TCG_REG_TMP1, TCG_REG_R0, TCG_REG_R3 }
+};
+
 static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
 {
-    MemOpIdx oi = lb->oi;
-    MemOp opc = get_memop(oi);
-    TCGReg hi, lo, arg = TCG_REG_R3;
+    MemOp opc = get_memop(lb->oi);
 
     if (!reloc_pc14(lb->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
         return false;
     }
 
-    tcg_out_mov(s, TCG_TYPE_PTR, arg++, TCG_AREG0);
-
-    lo = lb->addrlo_reg;
-    hi = lb->addrhi_reg;
-    if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
-        arg |= (TCG_TARGET_CALL_ARG_I64 == TCG_CALL_ARG_EVEN);
-        tcg_out_mov(s, TCG_TYPE_I32, arg++, hi);
-        tcg_out_mov(s, TCG_TYPE_I32, arg++, lo);
-    } else {
-        /* If the address needed to be zero-extended, we'll have already
-           placed it in R4.  The only remaining case is 64-bit guest.  */
-        tcg_out_mov(s, TCG_TYPE_TL, arg++, lo);
-    }
-
-    tcg_out_movi(s, TCG_TYPE_I32, arg++, oi);
-    tcg_out32(s, MFSPR | RT(arg) | LR);
-
+    tcg_out_ld_helper_args(s, lb, &ldst_helper_param);
     tcg_out_call_int(s, LK, qemu_ld_helpers[opc & (MO_BSWAP | MO_SIZE)]);
-
-    lo = lb->datalo_reg;
-    hi = lb->datahi_reg;
-    if (TCG_TARGET_REG_BITS == 32 && (opc & MO_SIZE) == MO_64) {
-        tcg_out_mov(s, TCG_TYPE_I32, lo, TCG_REG_R4);
-        tcg_out_mov(s, TCG_TYPE_I32, hi, TCG_REG_R3);
-    } else {
-        tcg_out_movext(s, lb->type, lo,
-                       TCG_TYPE_REG, opc & MO_SSIZE, TCG_REG_R3);
-    }
+    tcg_out_ld_helper_ret(s, lb, false, &ldst_helper_param);
 
     tcg_out_b(s, 0, lb->raddr);
     return true;
 }
 
 static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
 {
-    MemOpIdx oi = lb->oi;
-    MemOp opc = get_memop(oi);
-    MemOp s_bits = opc & MO_SIZE;
-    TCGReg hi, lo, arg = TCG_REG_R3;
+    MemOp opc = get_memop(lb->oi);
 
     if (!reloc_pc14(lb->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
         return false;
     }
 
-    tcg_out_mov(s, TCG_TYPE_PTR, arg++, TCG_AREG0);
-
-    lo = lb->addrlo_reg;
-    hi = lb->addrhi_reg;
-    if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
-        arg |= (TCG_TARGET_CALL_ARG_I64 == TCG_CALL_ARG_EVEN);
-        tcg_out_mov(s, TCG_TYPE_I32, arg++, hi);
-        tcg_out_mov(s, TCG_TYPE_I32, arg++, lo);
-    } else {
-        /* If the address needed to be zero-extended, we'll have already
-           placed it in R4.  The only remaining case is 64-bit guest.  */
-        tcg_out_mov(s, TCG_TYPE_TL, arg++, lo);
-    }
-
-    lo = lb->datalo_reg;
-    hi = lb->datahi_reg;
-    if (TCG_TARGET_REG_BITS == 32 && s_bits == MO_64) {
-        arg |= (TCG_TARGET_CALL_ARG_I64 == TCG_CALL_ARG_EVEN);
-        tcg_out_mov(s, TCG_TYPE_I32, arg++, hi);
-        tcg_out_mov(s, TCG_TYPE_I32, arg++, lo);
-    } else {
-        tcg_out_movext(s, s_bits == MO_64 ? TCG_TYPE_I64 : TCG_TYPE_I32,
-                       arg++, lb->type, s_bits, lo);
-    }
-
-    tcg_out_movi(s, TCG_TYPE_I32, arg++, oi);
-    tcg_out32(s, MFSPR | RT(arg) | LR);
-
+    tcg_out_st_helper_args(s, lb, &ldst_helper_param);
     tcg_out_call_int(s, LK, qemu_st_helpers[opc & (MO_BSWAP | MO_SIZE)]);
 
     tcg_out_b(s, 0, lb->raddr);