Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm64 / include / asm / syscall.h

diff --git a/kernel/arch/arm64/include/asm/syscall.h b/kernel/arch/arm64/include/asm/syscall.h
new file mode 100644 (file)
index 0000000..709a574
--- /dev/null
+++ b/kernel/arch/arm64/include/asm/syscall.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SYSCALL_H
+#define __ASM_SYSCALL_H
+
+#include <uapi/linux/audit.h>
+#include <linux/compat.h>
+#include <linux/err.h>
+
+extern const void *sys_call_table[];
+
+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_error(struct task_struct *task,
+                                    struct pt_regs *regs)
+{
+       unsigned long error = regs->regs[0];
+       return IS_ERR_VALUE(error) ? error : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+                                           struct pt_regs *regs)
+{
+       return regs->regs[0];
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+                                           struct pt_regs *regs,
+                                           int error, long val)
+{
+       regs->regs[0] = (long) error ? error : val;
+}
+
+#define SYSCALL_MAX_ARGS 6
+
+static inline void syscall_get_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        unsigned long *args)
+{
+       if (n == 0)
+               return;
+
+       if (i + n > SYSCALL_MAX_ARGS) {
+               unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
+               unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
+               pr_warning("%s called with max args %d, handling only %d\n",
+                          __func__, i + n, SYSCALL_MAX_ARGS);
+               memset(args_bad, 0, n_bad * sizeof(args[0]));
+       }
+
+       if (i == 0) {
+               args[0] = regs->orig_x0;
+               args++;
+               i++;
+               n--;
+       }
+
+       memcpy(args, &regs->regs[i], n * sizeof(args[0]));
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        const unsigned long *args)
+{
+       if (n == 0)
+               return;
+
+       if (i + n > SYSCALL_MAX_ARGS) {
+               pr_warning("%s called with max args %d, handling only %d\n",
+                          __func__, i + n, SYSCALL_MAX_ARGS);
+               n = SYSCALL_MAX_ARGS - i;
+       }
+
+       if (i == 0) {
+               regs->orig_x0 = args[0];
+               args++;
+               i++;
+               n--;
+       }
+
+       memcpy(&regs->regs[i], args, n * 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(void)
+{
+       if (is_compat_task())
+               return AUDIT_ARCH_ARM;
+
+       return AUDIT_ARCH_AARCH64;
+}
+
+#endif /* __ASM_SYSCALL_H */