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 */

  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	return task_thread_info(task)->syscall;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 26}
 27
 28static inline void syscall_rollback(struct task_struct *task,
 29				    struct pt_regs *regs)
 30{
 31	regs->ARM_r0 = regs->ARM_ORIG_r0;
 32}
 33
 34static inline long syscall_get_error(struct task_struct *task,
 35				     struct pt_regs *regs)
 36{
 37	unsigned long error = regs->ARM_r0;
 38	return IS_ERR_VALUE(error) ? error : 0;
 39}
 40
 41static inline long syscall_get_return_value(struct task_struct *task,
 42					    struct pt_regs *regs)
 43{
 44	return regs->ARM_r0;
 45}
 46
 47static inline void syscall_set_return_value(struct task_struct *task,
 48					    struct pt_regs *regs,
 49					    int error, long val)
 50{
 51	regs->ARM_r0 = (long) error ? error : val;
 52}
 53
 54#define SYSCALL_MAX_ARGS 7
 55
 56static inline void syscall_get_arguments(struct task_struct *task,
 57					 struct pt_regs *regs,
 58					 unsigned int i, unsigned int n,
 59					 unsigned long *args)
 60{
 61	if (n == 0)
 62		return;
 63
 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;
 71	}
 72
 73	if (i == 0) {
 74		args[0] = regs->ARM_ORIG_r0;
 75		args++;
 76		i++;
 77		n--;
 78	}
 79
 80	memcpy(args, &regs->ARM_r0 + i, n * sizeof(args[0]));
 81}
 82
 83static inline void syscall_set_arguments(struct task_struct *task,
 84					 struct pt_regs *regs,
 85					 unsigned int i, unsigned int n,
 86					 const unsigned long *args)
 87{
 88	if (n == 0)
 89		return;
 90
 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;
 95	}
 96
 97	if (i == 0) {
 98		regs->ARM_ORIG_r0 = args[0];
 99		args++;
100		i++;
101		n--;
102	}
103
104	memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
105}
106
107static inline int syscall_get_arch(void)
108{
109	/* ARM tasks don't change audit architectures on the fly. */
110	return AUDIT_ARCH_ARM;
111}
112
113#endif /* _ASM_ARM_SYSCALL_H */