2 * Access to user system call parameters and results
4 * See asm-generic/syscall.h for descriptions of what we must do here.
7 #ifndef _ASM_ARM_SYSCALL_H
8 #define _ASM_ARM_SYSCALL_H
10 #include <linux/audit.h> /* for AUDIT_ARCH_* */
11 #include <linux/elf.h> /* for ELF_EM */
12 #include <linux/err.h>
13 #include <linux/sched.h>
15 #include <asm/unistd.h>
17 #define NR_syscalls (__NR_syscalls)
19 extern const unsigned long sys_call_table[];
21 static inline int syscall_get_nr(struct task_struct *task,
24 return task_thread_info(task)->syscall;
27 static inline void syscall_rollback(struct task_struct *task,
30 regs->ARM_r0 = regs->ARM_ORIG_r0;
33 static inline long syscall_get_error(struct task_struct *task,
36 unsigned long error = regs->ARM_r0;
37 return IS_ERR_VALUE(error) ? error : 0;
40 static inline long syscall_get_return_value(struct task_struct *task,
46 static inline void syscall_set_return_value(struct task_struct *task,
50 regs->ARM_r0 = (long) error ? error : val;
53 #define SYSCALL_MAX_ARGS 7
55 static inline void syscall_get_arguments(struct task_struct *task,
57 unsigned int i, unsigned int n,
63 if (i + n > SYSCALL_MAX_ARGS) {
64 unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
65 unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
66 pr_warning("%s called with max args %d, handling only %d\n",
67 __func__, i + n, SYSCALL_MAX_ARGS);
68 memset(args_bad, 0, n_bad * sizeof(args[0]));
69 n = SYSCALL_MAX_ARGS - i;
73 args[0] = regs->ARM_ORIG_r0;
79 memcpy(args, ®s->ARM_r0 + i, n * sizeof(args[0]));
82 static inline void syscall_set_arguments(struct task_struct *task,
84 unsigned int i, unsigned int n,
85 const unsigned long *args)
90 if (i + n > SYSCALL_MAX_ARGS) {
91 pr_warning("%s called with max args %d, handling only %d\n",
92 __func__, i + n, SYSCALL_MAX_ARGS);
93 n = SYSCALL_MAX_ARGS - i;
97 regs->ARM_ORIG_r0 = args[0];
103 memcpy(®s->ARM_r0 + i, args, n * sizeof(args[0]));
106 static inline int syscall_get_arch(struct task_struct *task,
107 struct pt_regs *regs)
109 /* ARM tasks don't change audit architectures on the fly. */
110 return AUDIT_ARCH_ARM;
113 #endif /* _ASM_ARM_SYSCALL_H */