1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Access to user system call parameters and results
5 * See asm-generic/syscall.h for descriptions of what we must do here.
8 #ifndef _ASM_ARM_SYSCALL_H
9 #define _ASM_ARM_SYSCALL_H
11 #include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */
12 #include <linux/elf.h> /* for ELF_EM */
13 #include <linux/err.h>
14 #include <linux/sched.h>
16 #include <asm/unistd.h>
18 #define NR_syscalls (__NR_syscalls)
20 extern const unsigned long sys_call_table[];
22 static inline int syscall_get_nr(struct task_struct *task,
25 return task_thread_info(task)->syscall;
28 static inline void syscall_rollback(struct task_struct *task,
31 regs->ARM_r0 = regs->ARM_ORIG_r0;
34 static inline long syscall_get_error(struct task_struct *task,
37 unsigned long error = regs->ARM_r0;
38 return IS_ERR_VALUE(error) ? error : 0;
41 static inline long syscall_get_return_value(struct task_struct *task,
47 static inline void syscall_set_return_value(struct task_struct *task,
51 regs->ARM_r0 = (long) error ? error : val;
54 #define SYSCALL_MAX_ARGS 7
56 static inline void syscall_get_arguments(struct task_struct *task,
58 unsigned int i, unsigned int n,
64 if (i + n > SYSCALL_MAX_ARGS) {
65 unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
66 unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
67 pr_warn("%s called with max args %d, handling only %d\n",
68 __func__, i + n, SYSCALL_MAX_ARGS);
69 memset(args_bad, 0, n_bad * sizeof(args[0]));
70 n = SYSCALL_MAX_ARGS - i;
74 args[0] = regs->ARM_ORIG_r0;
80 memcpy(args, ®s->ARM_r0 + i, n * sizeof(args[0]));
83 static inline void syscall_set_arguments(struct task_struct *task,
85 unsigned int i, unsigned int n,
86 const unsigned long *args)
91 if (i + n > SYSCALL_MAX_ARGS) {
92 pr_warn("%s called with max args %d, handling only %d\n",
93 __func__, i + n, SYSCALL_MAX_ARGS);
94 n = SYSCALL_MAX_ARGS - i;
98 regs->ARM_ORIG_r0 = args[0];
104 memcpy(®s->ARM_r0 + i, args, n * sizeof(args[0]));
107 static inline int syscall_get_arch(void)
109 /* ARM tasks don't change audit architectures on the fly. */
110 return AUDIT_ARCH_ARM;
113 #endif /* _ASM_ARM_SYSCALL_H */