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-rw-r--r--kernel/arch/arm/include/asm/syscall.h112
1 files changed, 112 insertions, 0 deletions
diff --git a/kernel/arch/arm/include/asm/syscall.h b/kernel/arch/arm/include/asm/syscall.h
new file mode 100644
index 000000000..e86c985b8
--- /dev/null
+++ b/kernel/arch/arm/include/asm/syscall.h
@@ -0,0 +1,112 @@
+/*
+ * Access to user system call parameters and results
+ *
+ * See asm-generic/syscall.h for descriptions of what we must do here.
+ */
+
+#ifndef _ASM_ARM_SYSCALL_H
+#define _ASM_ARM_SYSCALL_H
+
+#include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */
+#include <linux/elf.h> /* for ELF_EM */
+#include <linux/err.h>
+#include <linux/sched.h>
+
+#include <asm/unistd.h>
+
+#define NR_syscalls (__NR_syscalls)
+
+extern const unsigned long sys_call_table[];
+
+static inline int syscall_get_nr(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return task_thread_info(task)->syscall;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ regs->ARM_r0 = regs->ARM_ORIG_r0;
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ unsigned long error = regs->ARM_r0;
+ return IS_ERR_VALUE(error) ? error : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return regs->ARM_r0;
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+ struct pt_regs *regs,
+ int error, long val)
+{
+ regs->ARM_r0 = (long) error ? error : val;
+}
+
+#define SYSCALL_MAX_ARGS 7
+
+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_warn("%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]));
+ n = SYSCALL_MAX_ARGS - i;
+ }
+
+ if (i == 0) {
+ args[0] = regs->ARM_ORIG_r0;
+ args++;
+ i++;
+ n--;
+ }
+
+ memcpy(args, &regs->ARM_r0 + 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_warn("%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->ARM_ORIG_r0 = args[0];
+ args++;
+ i++;
+ n--;
+ }
+
+ memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
+}
+
+static inline int syscall_get_arch(void)
+{
+ /* ARM tasks don't change audit architectures on the fly. */
+ return AUDIT_ARCH_ARM;
+}
+
+#endif /* _ASM_ARM_SYSCALL_H */