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[PATCH 3/9] aarch64: Add public syscall ABI
From: |
Sergey Bugaev |
Subject: |
[PATCH 3/9] aarch64: Add public syscall ABI |
Date: |
Mon, 15 Apr 2024 12:01:43 +0300 |
We use largely the same ABI as Linux: a syscall is invoked with the
"svc #0" instruction, passing arguments the same way as for a regular
function call. Specifically, up to 8 arguments are passed in the x0-x7
registers, and the rest are placed on the stack (this is only necessary
for the vm_map() syscall). w8 should contain the (negative) Mach trap
number. A syscall preserves all registers except for x0, which upon
returning contains the return value.
---
aarch64/Makefrag.am | 2 ++
aarch64/include/mach/aarch64/asm.h | 39 +++++++++++++++++++++++
aarch64/include/mach/aarch64/syscall_sw.h | 32 +++++++++++++++++++
3 files changed, 73 insertions(+)
create mode 100644 aarch64/include/mach/aarch64/asm.h
create mode 100644 aarch64/include/mach/aarch64/syscall_sw.h
diff --git a/aarch64/Makefrag.am b/aarch64/Makefrag.am
index 15ce3f49..7949d7ba 100644
--- a/aarch64/Makefrag.am
+++ b/aarch64/Makefrag.am
@@ -27,9 +27,11 @@ if HOST_aarch64
include_mach_aarch64dir = $(includedir)/mach/aarch64
include_mach_aarch64_HEADERS = \
+ aarch64/include/mach/aarch64/asm.h \
aarch64/include/mach/aarch64/boolean.h \
aarch64/include/mach/aarch64/kern_return.h \
aarch64/include/mach/aarch64/machine_types.defs \
+ aarch64/include/mach/aarch64/syscall_sw.h \
aarch64/include/mach/aarch64/vm_types.h
endif # HOST_aarch64
diff --git a/aarch64/include/mach/aarch64/asm.h
b/aarch64/include/mach/aarch64/asm.h
new file mode 100644
index 00000000..ae94e637
--- /dev/null
+++ b/aarch64/include/mach/aarch64/asm.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2023-2024 Free Software Foundation.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _MACH_AARCH64_ASM_H_
+#define _MACH_AARCH64_ASM_H_
+
+#define EXT(x) x
+#define LEXT(x) x ## :
+#define SEXT(x) #x
+
+#define TEXT_ALIGN 4
+#define DATA_ALIGN 4
+
+#define SVC svc # (0)
+#define ENTRY(x) .globl EXT(x); .type EXT(x), @function; .p2align
TEXT_ALIGN; LEXT(x)
+#define END(x) .size x,.-x
+
+#ifdef __ARM_FEATURE_BTI_DEFAULT
+#define MACH_BTI_C bti c
+#else
+#define MACH_BTI_C
+#endif
+
+#endif /* _MACH_AARCH64_ASM_H_ */
diff --git a/aarch64/include/mach/aarch64/syscall_sw.h
b/aarch64/include/mach/aarch64/syscall_sw.h
new file mode 100644
index 00000000..cf13dd7e
--- /dev/null
+++ b/aarch64/include/mach/aarch64/syscall_sw.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2023-2024 Free Software Foundation.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _MACH_AARCH64_SYSCALL_SW_H_
+#define _MACH_AARCH64_SYSCALL_SW_H_
+
+#include <mach/machine/asm.h>
+
+#define kernel_trap(trap_name,trap_number,number_args) \
+ENTRY(trap_name) \
+ MACH_BTI_C; \
+ mov w8, #(trap_number); \
+ SVC; \
+ ret; \
+END(trap_name)
+
+#endif /* _MACH_AARCH64_SYSCALL_SW_H_ */
--
2.44.0
- [PATCH 0/9] AArch64 Mach public headers, Sergey Bugaev, 2024/04/15
- [PATCH 1/9] Add CPU_TYPE_ARM64, Sergey Bugaev, 2024/04/15
- [PATCH 4/9] aarch64: Add vm_param.h, Sergey Bugaev, 2024/04/15
- [PATCH 3/9] aarch64: Add public syscall ABI,
Sergey Bugaev <=
- [PATCH 5/9] aarch64: Add mach_aarch64 API, Sergey Bugaev, 2024/04/15
- [PATCH 6/9] aarch64: Add exception type definitions, Sergey Bugaev, 2024/04/15
- [PATCH 2/9] aarch64: Add the basics, Sergey Bugaev, 2024/04/15
- [PATCH 7/9] aarch64: Add thread state types, Sergey Bugaev, 2024/04/15
- [PATCH 9/9] Add a test for thread state, Sergey Bugaev, 2024/04/15
[PATCH 8/9] Add thread_set_self_state() trap, Sergey Bugaev, 2024/04/15