@@ -1272,6 +1272,7 @@ aarch64*-*-gnu*)
tm_defines="${tm_defines} TARGET_DEFAULT_ASYNC_UNWIND_TABLES=1"
;;
aarch64-*-mingw*)
+ tm_file="${tm_file} aarch64/aarch64-abi-ms.h"
tmake_file="${tmake_file} aarch64/t-aarch64"
case ${enable_threads} in
"" | yes | win32)
new file mode 100644
@@ -0,0 +1,34 @@
+/* Machine description for AArch64 MS ABI.
+ Copyright (C) 2024 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#ifndef GCC_AARCH64_ABI_MS_H
+#define GCC_AARCH64_ABI_MS_H
+
+/* X18 reserved for the TEB on Windows. */
+
+#undef FIXED_X18
+#define FIXED_X18 1
+
+#undef CALL_USED_X18
+#define CALL_USED_X18 0
+
+#undef STATIC_CHAIN_REGNUM
+#define STATIC_CHAIN_REGNUM R17_REGNUM
+
+#endif /* GCC_AARCH64_ABI_MS_H. */
@@ -536,11 +536,14 @@ constexpr auto AARCH64_FL_DEFAULT_ISA_MODE = AARCH64_FL_SM_OFF;
register. GCC internally uses the poly_int variable aarch64_sve_vg
instead. */
+#define FIXED_X18 0
+#define CALL_USED_X18 1
+
#define FIXED_REGISTERS \
{ \
0, 0, 0, 0, 0, 0, 0, 0, /* R0 - R7 */ \
0, 0, 0, 0, 0, 0, 0, 0, /* R8 - R15 */ \
- 0, 0, 0, 0, 0, 0, 0, 0, /* R16 - R23 */ \
+ 0, 0, FIXED_X18, 0, 0, 0, 0, 0, /* R16 - R23. */ \
0, 0, 0, 0, 0, 1, 0, 1, /* R24 - R30, SP */ \
0, 0, 0, 0, 0, 0, 0, 0, /* V0 - V7 */ \
0, 0, 0, 0, 0, 0, 0, 0, /* V8 - V15 */ \
@@ -564,7 +567,7 @@ constexpr auto AARCH64_FL_DEFAULT_ISA_MODE = AARCH64_FL_SM_OFF;
{ \
1, 1, 1, 1, 1, 1, 1, 1, /* R0 - R7 */ \
1, 1, 1, 1, 1, 1, 1, 1, /* R8 - R15 */ \
- 1, 1, 1, 0, 0, 0, 0, 0, /* R16 - R23 */ \
+ 1, 1, CALL_USED_X18, 0, 0, 0, 0, 0, /* R16 - R23. */ \
0, 0, 0, 0, 0, 1, 1, 1, /* R24 - R30, SP */ \
1, 1, 1, 1, 1, 1, 1, 1, /* V0 - V7 */ \
0, 0, 0, 0, 0, 0, 0, 0, /* V8 - V15 */ \
From: Zac Walker <zacwalker@microsoft.com> Date: Thu, 11 Apr 2024 13:30:27 +0200 Subject: [PATCH v3 02/12] aarch64: Mark x18 register as a fixed register for MS ABI Define the MS ABI for aarch64-w64-mingw32. Adjust FIXED_REGISTERS, CALL_REALLY_USED_REGISTERS and STATIC_CHAIN_REGNUM for AArch64 MS ABI. The X18 register is reserved on Windows for the TEB. gcc/ChangeLog: * config.gcc: Define TARGET_AARCH64_MS_ABI when AArch64 MS ABI is used. * config/aarch64/aarch64.h (FIXED_X18): Adjust FIXED_REGISTERS, CALL_REALLY_USED_REGISTERS and STATIC_CHAIN_REGNUM for AArch64 MS ABI. (CALL_USED_X18): Likewise. (FIXED_REGISTERS): Likewise. * config/aarch64/aarch64-abi-ms.h: New file. --- gcc/config.gcc | 1 + gcc/config/aarch64/aarch64-abi-ms.h | 34 +++++++++++++++++++++++++++++ gcc/config/aarch64/aarch64.h | 7 ++++-- 3 files changed, 40 insertions(+), 2 deletions(-) create mode 100644 gcc/config/aarch64/aarch64-abi-ms.h