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-rw-r--r--arch/arm64/include/asm/syscall.h88
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
new file mode 100644
index 000000000..4cfe9b497
--- /dev/null
+++ b/arch/arm64/include/asm/syscall.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ */
+#ifndef __ASM_SYSCALL_H
+#define __ASM_SYSCALL_H
+
+#include <uapi/linux/audit.h>
+#include <linux/compat.h>
+#include <linux/err.h>
+
+typedef long (*syscall_fn_t)(const struct pt_regs *regs);
+
+extern const syscall_fn_t sys_call_table[];
+
+#ifdef CONFIG_COMPAT
+extern const syscall_fn_t compat_sys_call_table[];
+#endif
+
+static inline int syscall_get_nr(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return regs->syscallno;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ regs->regs[0] = regs->orig_x0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ unsigned long val = regs->regs[0];
+
+ if (is_compat_thread(task_thread_info(task)))
+ val = sign_extend64(val, 31);
+
+ return val;
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ unsigned long error = syscall_get_return_value(task, regs);
+
+ return IS_ERR_VALUE(error) ? error : 0;
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+ struct pt_regs *regs,
+ int error, long val)
+{
+ if (error)
+ val = error;
+
+ if (is_compat_thread(task_thread_info(task)))
+ val = lower_32_bits(val);
+
+ regs->regs[0] = val;
+}
+
+#define SYSCALL_MAX_ARGS 6
+
+static inline void syscall_get_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned long *args)
+{
+ args[0] = regs->orig_x0;
+ args++;
+
+ memcpy(args, &regs->regs[1], 5 * sizeof(args[0]));
+}
+
+/*
+ * We don't care about endianness (__AUDIT_ARCH_LE bit) here because
+ * AArch64 has the same system calls both on little- and big- endian.
+ */
+static inline int syscall_get_arch(struct task_struct *task)
+{
+ if (is_compat_thread(task_thread_info(task)))
+ return AUDIT_ARCH_ARM;
+
+ return AUDIT_ARCH_AARCH64;
+}
+
+#endif /* __ASM_SYSCALL_H */