1/*
 2 * Access to user system call parameters and results
 3 *
 4 * See asm-generic/syscall.h for descriptions of what we must do here.
 5 */
 6
 7#ifndef _ASM_ARM_SYSCALL_H
 8#define _ASM_ARM_SYSCALL_H
 9
 
 
10#include <linux/err.h>
 
 
 
 
 
11
12extern const unsigned long sys_call_table[];
13
14static inline int syscall_get_nr(struct task_struct *task,
15				 struct pt_regs *regs)
16{
17	return task_thread_info(task)->syscall;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
18}
19
20static inline void syscall_rollback(struct task_struct *task,
21				    struct pt_regs *regs)
22{
23	regs->ARM_r0 = regs->ARM_ORIG_r0;
24}
25
26static inline long syscall_get_error(struct task_struct *task,
27				     struct pt_regs *regs)
28{
29	unsigned long error = regs->ARM_r0;
30	return IS_ERR_VALUE(error) ? error : 0;
31}
32
33static inline long syscall_get_return_value(struct task_struct *task,
34					    struct pt_regs *regs)
35{
36	return regs->ARM_r0;
37}
38
39static inline void syscall_set_return_value(struct task_struct *task,
40					    struct pt_regs *regs,
41					    int error, long val)
42{
43	regs->ARM_r0 = (long) error ? error : val;
44}
45
46#define SYSCALL_MAX_ARGS 7
47
48static inline void syscall_get_arguments(struct task_struct *task,
49					 struct pt_regs *regs,
50					 unsigned int i, unsigned int n,
51					 unsigned long *args)
52{
53	if (i + n > SYSCALL_MAX_ARGS) {
54		unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
55		unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
56		pr_warning("%s called with max args %d, handling only %d\n",
57			   __func__, i + n, SYSCALL_MAX_ARGS);
58		memset(args_bad, 0, n_bad * sizeof(args[0]));
59		n = SYSCALL_MAX_ARGS - i;
60	}
61
62	if (i == 0) {
63		args[0] = regs->ARM_ORIG_r0;
64		args++;
65		i++;
66		n--;
67	}
68
69	memcpy(args, &regs->ARM_r0 + i, n * sizeof(args[0]));
70}
71
72static inline void syscall_set_arguments(struct task_struct *task,
73					 struct pt_regs *regs,
74					 unsigned int i, unsigned int n,
75					 const unsigned long *args)
76{
77	if (i + n > SYSCALL_MAX_ARGS) {
78		pr_warning("%s called with max args %d, handling only %d\n",
79			   __func__, i + n, SYSCALL_MAX_ARGS);
80		n = SYSCALL_MAX_ARGS - i;
81	}
82
83	if (i == 0) {
84		regs->ARM_ORIG_r0 = args[0];
85		args++;
86		i++;
87		n--;
88	}
89
90	memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
91}
92
93#endif /* _ASM_ARM_SYSCALL_H */

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Access to user system call parameters and results
 4 *
 5 * See asm-generic/syscall.h for descriptions of what we must do here.
 6 */
 7
 8#ifndef _ASM_ARM_SYSCALL_H
 9#define _ASM_ARM_SYSCALL_H
10
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>
15
16#include <asm/unistd.h>
17
18#define NR_syscalls (__NR_syscalls)
19
20extern const unsigned long sys_call_table[];
21
22static inline int syscall_get_nr(struct task_struct *task,
23				 struct pt_regs *regs)
24{
25	if (IS_ENABLED(CONFIG_AEABI) && !IS_ENABLED(CONFIG_OABI_COMPAT))
26		return task_thread_info(task)->abi_syscall;
27
28	if (task_thread_info(task)->abi_syscall == -1)
29		return -1;
30
31	return task_thread_info(task)->abi_syscall & __NR_SYSCALL_MASK;
32}
33
34static inline bool __in_oabi_syscall(struct task_struct *task)
35{
36	return IS_ENABLED(CONFIG_OABI_COMPAT) &&
37		(task_thread_info(task)->abi_syscall & __NR_OABI_SYSCALL_BASE);
38}
39
40static inline bool in_oabi_syscall(void)
41{
42	return __in_oabi_syscall(current);
43}
44
45static inline void syscall_rollback(struct task_struct *task,
46				    struct pt_regs *regs)
47{
48	regs->ARM_r0 = regs->ARM_ORIG_r0;
49}
50
51static inline long syscall_get_error(struct task_struct *task,
52				     struct pt_regs *regs)
53{
54	unsigned long error = regs->ARM_r0;
55	return IS_ERR_VALUE(error) ? error : 0;
56}
57
58static inline long syscall_get_return_value(struct task_struct *task,
59					    struct pt_regs *regs)
60{
61	return regs->ARM_r0;
62}
63
64static inline void syscall_set_return_value(struct task_struct *task,
65					    struct pt_regs *regs,
66					    int error, long val)
67{
68	regs->ARM_r0 = (long) error ? error : val;
69}
70
71#define SYSCALL_MAX_ARGS 7
72
73static inline void syscall_get_arguments(struct task_struct *task,
74					 struct pt_regs *regs,
 
75					 unsigned long *args)
76{
77	args[0] = regs->ARM_ORIG_r0;
78	args++;
 
 
 
 
 
 
 
 
 
 
 
 
 
79
80	memcpy(args, &regs->ARM_r0 + 1, 5 * sizeof(args[0]));
81}
82
83static inline int syscall_get_arch(struct task_struct *task)
 
 
 
84{
85	/* ARM tasks don't change audit architectures on the fly. */
86	return AUDIT_ARCH_ARM;
 
 
 
 
 
 
 
 
 
 
 
 
87}
88
89#endif /* _ASM_ARM_SYSCALL_H */