diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index 54f260a66b..5fe90cbb42 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -32,6 +32,7 @@
 #include "qemu/plugin.h"
 #include "qemu/queue.h"
 #include "tcg/tcg-mo.h"
+#include "tcg-target-reg-bits.h"
 #include "tcg-target.h"
 #include "tcg/tcg-cond.h"
 #include "tcg/debug-assert.h"
@@ -44,17 +45,6 @@
 #define CPU_TEMP_BUF_NLONGS 128
 #define TCG_STATIC_FRAME_SIZE  (CPU_TEMP_BUF_NLONGS * sizeof(long))
 
-/* Default target word size to pointer size.  */
-#ifndef TCG_TARGET_REG_BITS
-# if UINTPTR_MAX == UINT32_MAX
-#  define TCG_TARGET_REG_BITS 32
-# elif UINTPTR_MAX == UINT64_MAX
-#  define TCG_TARGET_REG_BITS 64
-# else
-#  error Unknown pointer size for tcg target
-# endif
-#endif
-
 #if TCG_TARGET_REG_BITS == 32
 typedef int32_t tcg_target_long;
 typedef uint32_t tcg_target_ulong;
diff --git a/tcg/aarch64/tcg-target-reg-bits.h b/tcg/aarch64/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..3b57a1aafb
--- /dev/null
+++ b/tcg/aarch64/tcg-target-reg-bits.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2023 Linaro
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+#define TCG_TARGET_REG_BITS  64
+
+#endif
diff --git a/tcg/arm/tcg-target-reg-bits.h b/tcg/arm/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..23b7730a8d
--- /dev/null
+++ b/tcg/arm/tcg-target-reg-bits.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2023 Linaro
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+#define TCG_TARGET_REG_BITS  32
+
+#endif
diff --git a/tcg/i386/tcg-target-reg-bits.h b/tcg/i386/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..aa386050eb
--- /dev/null
+++ b/tcg/i386/tcg-target-reg-bits.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2008 Fabrice Bellard
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+#ifdef __x86_64__
+# define TCG_TARGET_REG_BITS  64
+#else
+# define TCG_TARGET_REG_BITS  32
+#endif
+
+#endif
diff --git a/tcg/i386/tcg-target.h b/tcg/i386/tcg-target.h
index b0922922b3..bc0413ead1 100644
--- a/tcg/i386/tcg-target.h
+++ b/tcg/i386/tcg-target.h
@@ -30,11 +30,9 @@
 #define TCG_TARGET_INSN_UNIT_SIZE  1
 
 #ifdef __x86_64__
-# define TCG_TARGET_REG_BITS  64
 # define TCG_TARGET_NB_REGS   32
 # define MAX_CODE_GEN_BUFFER_SIZE  (2 * GiB)
 #else
-# define TCG_TARGET_REG_BITS  32
 # define TCG_TARGET_NB_REGS   24
 # define MAX_CODE_GEN_BUFFER_SIZE  UINT32_MAX
 #endif
diff --git a/tcg/loongarch64/tcg-target-reg-bits.h b/tcg/loongarch64/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..51373ad70a
--- /dev/null
+++ b/tcg/loongarch64/tcg-target-reg-bits.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2021 WANG Xuerui <git@xen0n.name>
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+/*
+ * Loongson removed the (incomplete) 32-bit support from kernel and toolchain
+ * for the initial upstreaming of this architecture, so don't bother and just
+ * support the LP64* ABI for now.
+ */
+#if defined(__loongarch64)
+# define TCG_TARGET_REG_BITS 64
+#else
+# error unsupported LoongArch register size
+#endif
+
+#endif
diff --git a/tcg/loongarch64/tcg-target.h b/tcg/loongarch64/tcg-target.h
index 482901ac15..26f1aab780 100644
--- a/tcg/loongarch64/tcg-target.h
+++ b/tcg/loongarch64/tcg-target.h
@@ -29,17 +29,6 @@
 #ifndef LOONGARCH_TCG_TARGET_H
 #define LOONGARCH_TCG_TARGET_H
 
-/*
- * Loongson removed the (incomplete) 32-bit support from kernel and toolchain
- * for the initial upstreaming of this architecture, so don't bother and just
- * support the LP64* ABI for now.
- */
-#if defined(__loongarch64)
-# define TCG_TARGET_REG_BITS 64
-#else
-# error unsupported LoongArch register size
-#endif
-
 #define TCG_TARGET_INSN_UNIT_SIZE 4
 #define TCG_TARGET_NB_REGS 32
 
diff --git a/tcg/mips/tcg-target-reg-bits.h b/tcg/mips/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..56fe0a725e
--- /dev/null
+++ b/tcg/mips/tcg-target-reg-bits.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2008-2009 Arnaud Patard <arnaud.patard@rtp-net.org>
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+#if _MIPS_SIM == _ABIO32
+# define TCG_TARGET_REG_BITS 32
+#elif _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
+# define TCG_TARGET_REG_BITS 64
+#else
+# error "Unknown ABI"
+#endif
+
+#endif
diff --git a/tcg/mips/tcg-target.h b/tcg/mips/tcg-target.h
index e52cdf0e89..fe4414c697 100644
--- a/tcg/mips/tcg-target.h
+++ b/tcg/mips/tcg-target.h
@@ -27,14 +27,6 @@
 #ifndef MIPS_TCG_TARGET_H
 #define MIPS_TCG_TARGET_H
 
-#if _MIPS_SIM == _ABIO32
-# define TCG_TARGET_REG_BITS 32
-#elif _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
-# define TCG_TARGET_REG_BITS 64
-#else
-# error "Unknown ABI"
-#endif
-
 #define TCG_TARGET_INSN_UNIT_SIZE 4
 #define TCG_TARGET_NB_REGS 32
 
diff --git a/tcg/ppc/tcg-target-reg-bits.h b/tcg/ppc/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..0efa80e7e0
--- /dev/null
+++ b/tcg/ppc/tcg-target-reg-bits.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2008 Fabrice Bellard
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+#ifdef _ARCH_PPC64
+# define TCG_TARGET_REG_BITS  64
+#else
+# define TCG_TARGET_REG_BITS  32
+#endif
+
+#endif
diff --git a/tcg/ppc/tcg-target.h b/tcg/ppc/tcg-target.h
index d68a65a9bc..9497754174 100644
--- a/tcg/ppc/tcg-target.h
+++ b/tcg/ppc/tcg-target.h
@@ -25,11 +25,6 @@
 #ifndef PPC_TCG_TARGET_H
 #define PPC_TCG_TARGET_H
 
-#ifdef _ARCH_PPC64
-# define TCG_TARGET_REG_BITS  64
-#else
-# define TCG_TARGET_REG_BITS  32
-#endif
 #define MAX_CODE_GEN_BUFFER_SIZE  ((size_t)-1)
 
 #define TCG_TARGET_NB_REGS 64
diff --git a/tcg/riscv/tcg-target-reg-bits.h b/tcg/riscv/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..761ca0d774
--- /dev/null
+++ b/tcg/riscv/tcg-target-reg-bits.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2018 SiFive, Inc
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+/*
+ * We don't support oversize guests.
+ * Since we will only build tcg once, this in turn requires a 64-bit host.
+ */
+#if __riscv_xlen != 64
+#error "unsupported code generation mode"
+#endif
+#define TCG_TARGET_REG_BITS 64
+
+#endif
diff --git a/tcg/riscv/tcg-target.h b/tcg/riscv/tcg-target.h
index ffb3d9b5b4..d23353c28e 100644
--- a/tcg/riscv/tcg-target.h
+++ b/tcg/riscv/tcg-target.h
@@ -25,15 +25,6 @@
 #ifndef RISCV_TCG_TARGET_H
 #define RISCV_TCG_TARGET_H
 
-/*
- * We don't support oversize guests.
- * Since we will only build tcg once, this in turn requires a 64-bit host.
- */
-#if __riscv_xlen != 64
-#error "unsupported code generation mode"
-#endif
-#define TCG_TARGET_REG_BITS 64
-
 #define TCG_TARGET_INSN_UNIT_SIZE 4
 #define TCG_TARGET_NB_REGS 32
 #define MAX_CODE_GEN_BUFFER_SIZE  ((size_t)-1)
diff --git a/tcg/s390x/tcg-target-reg-bits.h b/tcg/s390x/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..b01414e09d
--- /dev/null
+++ b/tcg/s390x/tcg-target-reg-bits.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2009 Ulrich Hecht <uli@suse.de>
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+/* We only support generating code for 64-bit mode.  */
+#if UINTPTR_MAX == UINT64_MAX
+# define TCG_TARGET_REG_BITS 64
+#else
+# error "unsupported code generation mode"
+#endif
+
+#endif
diff --git a/tcg/sparc64/tcg-target-reg-bits.h b/tcg/sparc64/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..34a6711013
--- /dev/null
+++ b/tcg/sparc64/tcg-target-reg-bits.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2023 Linaro
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+#define TCG_TARGET_REG_BITS  64
+
+#endif
diff --git a/tcg/tci/tcg-target-reg-bits.h b/tcg/tci/tcg-target-reg-bits.h
new file mode 100644
index 0000000000..dcb1a203f8
--- /dev/null
+++ b/tcg/tci/tcg-target-reg-bits.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define target-specific register size
+ * Copyright (c) 2009, 2011 Stefan Weil
+ */
+
+#ifndef TCG_TARGET_REG_BITS_H
+#define TCG_TARGET_REG_BITS_H
+
+#if UINTPTR_MAX == UINT32_MAX
+# define TCG_TARGET_REG_BITS 32
+#elif UINTPTR_MAX == UINT64_MAX
+# define TCG_TARGET_REG_BITS 64
+#else
+# error Unknown pointer size for tci target
+#endif
+
+#endif
diff --git a/tcg/tci/tcg-target.h b/tcg/tci/tcg-target.h
index 60a6ed65ce..37ee10c959 100644
--- a/tcg/tci/tcg-target.h
+++ b/tcg/tci/tcg-target.h
@@ -44,14 +44,6 @@
 #define TCG_TARGET_INSN_UNIT_SIZE 4
 #define MAX_CODE_GEN_BUFFER_SIZE  ((size_t)-1)
 
-#if UINTPTR_MAX == UINT32_MAX
-# define TCG_TARGET_REG_BITS 32
-#elif UINTPTR_MAX == UINT64_MAX
-# define TCG_TARGET_REG_BITS 64
-#else
-# error Unknown pointer size for tci target
-#endif
-
 /* Optional instructions. */
 
 #define TCG_TARGET_HAS_bswap16_i32      1
diff --git a/tcg/s390x/tcg-target.c.inc b/tcg/s390x/tcg-target.c.inc
index 264a5628db..6e168e69e5 100644
--- a/tcg/s390x/tcg-target.c.inc
+++ b/tcg/s390x/tcg-target.c.inc
@@ -24,11 +24,6 @@
  * THE SOFTWARE.
  */
 
-/* We only support generating code for 64-bit mode.  */
-#if TCG_TARGET_REG_BITS != 64
-#error "unsupported code generation mode"
-#endif
-
 #include "../tcg-ldst.c.inc"
 #include "../tcg-pool.c.inc"
 #include "elf.h"
