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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
bf2c9f98 WF |
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 | ||
579ec9e1 | 11 | #include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */ |
1f59d13b | 12 | #include <linux/elf.h> /* for ELF_EM */ |
bf2c9f98 | 13 | #include <linux/err.h> |
8ef102c6 | 14 | #include <linux/sched.h> |
bf2c9f98 | 15 | |
1f66e06f WF |
16 | #include <asm/unistd.h> |
17 | ||
18 | #define NR_syscalls (__NR_syscalls) | |
19 | ||
bf2c9f98 WF |
20 | extern const unsigned long sys_call_table[]; |
21 | ||
22 | static inline int syscall_get_nr(struct task_struct *task, | |
23 | struct pt_regs *regs) | |
24 | { | |
25 | return task_thread_info(task)->syscall; | |
26 | } | |
27 | ||
28 | static inline void syscall_rollback(struct task_struct *task, | |
29 | struct pt_regs *regs) | |
30 | { | |
31 | regs->ARM_r0 = regs->ARM_ORIG_r0; | |
32 | } | |
33 | ||
34 | static 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 | ||
41 | static inline long syscall_get_return_value(struct task_struct *task, | |
42 | struct pt_regs *regs) | |
43 | { | |
44 | return regs->ARM_r0; | |
45 | } | |
46 | ||
47 | static 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 | ||
56 | static 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 | { | |
3c1532df AT |
61 | if (n == 0) |
62 | return; | |
63 | ||
bf2c9f98 WF |
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; | |
8b521cb2 JP |
67 | pr_warn("%s called with max args %d, handling only %d\n", |
68 | __func__, i + n, SYSCALL_MAX_ARGS); | |
bf2c9f98 WF |
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, ®s->ARM_r0 + i, n * sizeof(args[0])); | |
81 | } | |
82 | ||
83 | static 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 | { | |
3c1532df AT |
88 | if (n == 0) |
89 | return; | |
90 | ||
bf2c9f98 | 91 | if (i + n > SYSCALL_MAX_ARGS) { |
8b521cb2 JP |
92 | pr_warn("%s called with max args %d, handling only %d\n", |
93 | __func__, i + n, SYSCALL_MAX_ARGS); | |
bf2c9f98 WF |
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(®s->ARM_r0 + i, args, n * sizeof(args[0])); | |
105 | } | |
106 | ||
5e937a9a | 107 | static inline int syscall_get_arch(void) |
1f59d13b WD |
108 | { |
109 | /* ARM tasks don't change audit architectures on the fly. */ | |
110 | return AUDIT_ARCH_ARM; | |
111 | } | |
112 | ||
bf2c9f98 | 113 | #endif /* _ASM_ARM_SYSCALL_H */ |