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
20 extern const unsigned long sys_call_table[];
21
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)22 static 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 return task_thread_info(task)->abi_syscall & __NR_SYSCALL_MASK;
29 }
30
__in_oabi_syscall(struct task_struct * task)31 static inline bool __in_oabi_syscall(struct task_struct *task)
32 {
33 return IS_ENABLED(CONFIG_OABI_COMPAT) &&
34 (task_thread_info(task)->abi_syscall & __NR_OABI_SYSCALL_BASE);
35 }
36
in_oabi_syscall(void)37 static inline bool in_oabi_syscall(void)
38 {
39 return __in_oabi_syscall(current);
40 }
41
syscall_rollback(struct task_struct * task,struct pt_regs * regs)42 static inline void syscall_rollback(struct task_struct *task,
43 struct pt_regs *regs)
44 {
45 regs->ARM_r0 = regs->ARM_ORIG_r0;
46 }
47
syscall_get_error(struct task_struct * task,struct pt_regs * regs)48 static inline long syscall_get_error(struct task_struct *task,
49 struct pt_regs *regs)
50 {
51 unsigned long error = regs->ARM_r0;
52 return IS_ERR_VALUE(error) ? error : 0;
53 }
54
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)55 static inline long syscall_get_return_value(struct task_struct *task,
56 struct pt_regs *regs)
57 {
58 return regs->ARM_r0;
59 }
60
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)61 static inline void syscall_set_return_value(struct task_struct *task,
62 struct pt_regs *regs,
63 int error, long val)
64 {
65 regs->ARM_r0 = (long) error ? error : val;
66 }
67
68 #define SYSCALL_MAX_ARGS 7
69
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)70 static inline void syscall_get_arguments(struct task_struct *task,
71 struct pt_regs *regs,
72 unsigned long *args)
73 {
74 args[0] = regs->ARM_ORIG_r0;
75 args++;
76
77 memcpy(args, ®s->ARM_r0 + 1, 5 * sizeof(args[0]));
78 }
79
syscall_get_arch(struct task_struct * task)80 static inline int syscall_get_arch(struct task_struct *task)
81 {
82 /* ARM tasks don't change audit architectures on the fly. */
83 return AUDIT_ARCH_ARM;
84 }
85
86 #endif /* _ASM_ARM_SYSCALL_H */
87