tcg/arm: Split out target constraints to tcg-target-con-str.h

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/arm/tcg-target-con-str.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define Arm target-specific operand constraints.
+ * Copyright (c) 2021 Linaro
+ */
+
+/*
+ * Define constraint letters for register sets:
+ * REGS(letter, register_mask)
+ */
+REGS('r', ALL_GENERAL_REGS)
+REGS('l', ALL_QLOAD_REGS)
+REGS('s', ALL_QSTORE_REGS)
+
+/*
+ * Define constraint letters for constants:
+ * CONST(letter, TCG_CT_CONST_* bit set)
+ */
+CONST('I', TCG_CT_CONST_ARM)
+CONST('K', TCG_CT_CONST_INV)
+CONST('N', TCG_CT_CONST_NEG)
+CONST('Z', TCG_CT_CONST_ZERO)

tcg/arm/tcg-target.c.inc

@@ -237,65 +237,27 @@ static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
 #define TCG_CT_CONST_NEG  0x400
 #define TCG_CT_CONST_ZERO 0x800
 
-/* parse target specific constraints */
-static const char *target_parse_constraint(TCGArgConstraint *ct,
-                                           const char *ct_str, TCGType type)
-{
-    switch (*ct_str++) {
-    case 'I':
-        ct->ct |= TCG_CT_CONST_ARM;
-        break;
-    case 'K':
-        ct->ct |= TCG_CT_CONST_INV;
-        break;
-    case 'N': /* The gcc constraint letter is L, already used here.  */
-        ct->ct |= TCG_CT_CONST_NEG;
-        break;
-    case 'Z':
-        ct->ct |= TCG_CT_CONST_ZERO;
-        break;
+#define ALL_GENERAL_REGS  0xffffu
 
-    case 'r':
-        ct->regs = 0xffff;
-        break;
-
-    /* qemu_ld address */
-    case 'l':
-        ct->regs = 0xffff;
+/*
+ * r0-r2 will be overwritten when reading the tlb entry (softmmu only)
+ * and r0-r1 doing the byte swapping, so don't use these.
+ * r3 is removed for softmmu to avoid clashes with helper arguments.
+ */
 #ifdef CONFIG_SOFTMMU
-        /* r0-r2,lr will be overwritten when reading the tlb entry,
-           so don't use these. */
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R0);
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R1);
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R2);
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R3);
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R14);
-#endif
-        break;
-
-    /* qemu_st address & data */
-    case 's':
-        ct->regs = 0xffff;
-        /* r0-r2 will be overwritten when reading the tlb entry (softmmu only)
-           and r0-r1 doing the byte swapping, so don't use these. */
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R0);
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R1);
-#if defined(CONFIG_SOFTMMU)
-        /* Avoid clashes with registers being used for helper args */
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R2);
-#if TARGET_LONG_BITS == 64
-        /* Avoid clashes with registers being used for helper args */
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R3);
-#endif
-        tcg_regset_reset_reg(ct->regs, TCG_REG_R14);
+#define ALL_QLOAD_REGS \
+    (ALL_GENERAL_REGS & ~((1 << TCG_REG_R0) | (1 << TCG_REG_R1) | \
+                          (1 << TCG_REG_R2) | (1 << TCG_REG_R3) | \
+                          (1 << TCG_REG_R14)))
+#define ALL_QSTORE_REGS \
+    (ALL_GENERAL_REGS & ~((1 << TCG_REG_R0) | (1 << TCG_REG_R1) | \
+                          (1 << TCG_REG_R2) | (1 << TCG_REG_R14) | \
+                          ((TARGET_LONG_BITS == 64) << TCG_REG_R3)))
+#else
+#define ALL_QLOAD_REGS   ALL_GENERAL_REGS
+#define ALL_QSTORE_REGS \
+    (ALL_GENERAL_REGS & ~((1 << TCG_REG_R0) | (1 << TCG_REG_R1)))
 #endif
-        break;
-
-    default:
-        return NULL;
-    }
-    return ct_str;
-}
 
 static inline uint32_t rotl(uint32_t val, int n)
 {

tcg/arm/tcg-target.h

@@ -142,5 +142,6 @@ void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
 #define TCG_TARGET_NEED_LDST_LABELS
 #endif
 #define TCG_TARGET_NEED_POOL_LABELS
+#define TCG_TARGET_CON_STR_H
 
 #endif