Commit | Line | Data |
---|---|---|
bf2c9f98 WF |
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 | ||
579ec9e1 | 10 | #include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */ |
1f59d13b | 11 | #include <linux/elf.h> /* for ELF_EM */ |
bf2c9f98 | 12 | #include <linux/err.h> |
8ef102c6 | 13 | #include <linux/sched.h> |
bf2c9f98 | 14 | |
1f66e06f WF |
15 | #include <asm/unistd.h> |
16 | ||
17 | #define NR_syscalls (__NR_syscalls) | |
18 | ||
bf2c9f98 WF |
19 | extern const unsigned long sys_call_table[]; |
20 | ||
21 | static inline int syscall_get_nr(struct task_struct *task, | |
22 | struct pt_regs *regs) | |
23 | { | |
24 | return task_thread_info(task)->syscall; | |
25 | } | |
26 | ||
27 | static inline void syscall_rollback(struct task_struct *task, | |
28 | struct pt_regs *regs) | |
29 | { | |
30 | regs->ARM_r0 = regs->ARM_ORIG_r0; | |
31 | } | |
32 | ||
33 | static inline long syscall_get_error(struct task_struct *task, | |
34 | struct pt_regs *regs) | |
35 | { | |
36 | unsigned long error = regs->ARM_r0; | |
37 | return IS_ERR_VALUE(error) ? error : 0; | |
38 | } | |
39 | ||
40 | static inline long syscall_get_return_value(struct task_struct *task, | |
41 | struct pt_regs *regs) | |
42 | { | |
43 | return regs->ARM_r0; | |
44 | } | |
45 | ||
46 | static inline void syscall_set_return_value(struct task_struct *task, | |
47 | struct pt_regs *regs, | |
48 | int error, long val) | |
49 | { | |
50 | regs->ARM_r0 = (long) error ? error : val; | |
51 | } | |
52 | ||
53 | #define SYSCALL_MAX_ARGS 7 | |
54 | ||
55 | static inline void syscall_get_arguments(struct task_struct *task, | |
56 | struct pt_regs *regs, | |
57 | unsigned int i, unsigned int n, | |
58 | unsigned long *args) | |
59 | { | |
3c1532df AT |
60 | if (n == 0) |
61 | return; | |
62 | ||
bf2c9f98 WF |
63 | if (i + n > SYSCALL_MAX_ARGS) { |
64 | unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i; | |
65 | unsigned int n_bad = n + i - SYSCALL_MAX_ARGS; | |
8b521cb2 JP |
66 | pr_warn("%s called with max args %d, handling only %d\n", |
67 | __func__, i + n, SYSCALL_MAX_ARGS); | |
bf2c9f98 WF |
68 | memset(args_bad, 0, n_bad * sizeof(args[0])); |
69 | n = SYSCALL_MAX_ARGS - i; | |
70 | } | |
71 | ||
72 | if (i == 0) { | |
73 | args[0] = regs->ARM_ORIG_r0; | |
74 | args++; | |
75 | i++; | |
76 | n--; | |
77 | } | |
78 | ||
79 | memcpy(args, ®s->ARM_r0 + i, n * sizeof(args[0])); | |
80 | } | |
81 | ||
82 | static inline void syscall_set_arguments(struct task_struct *task, | |
83 | struct pt_regs *regs, | |
84 | unsigned int i, unsigned int n, | |
85 | const unsigned long *args) | |
86 | { | |
3c1532df AT |
87 | if (n == 0) |
88 | return; | |
89 | ||
bf2c9f98 | 90 | if (i + n > SYSCALL_MAX_ARGS) { |
8b521cb2 JP |
91 | pr_warn("%s called with max args %d, handling only %d\n", |
92 | __func__, i + n, SYSCALL_MAX_ARGS); | |
bf2c9f98 WF |
93 | n = SYSCALL_MAX_ARGS - i; |
94 | } | |
95 | ||
96 | if (i == 0) { | |
97 | regs->ARM_ORIG_r0 = args[0]; | |
98 | args++; | |
99 | i++; | |
100 | n--; | |
101 | } | |
102 | ||
103 | memcpy(®s->ARM_r0 + i, args, n * sizeof(args[0])); | |
104 | } | |
105 | ||
5e937a9a | 106 | static inline int syscall_get_arch(void) |
1f59d13b WD |
107 | { |
108 | /* ARM tasks don't change audit architectures on the fly. */ | |
109 | return AUDIT_ARCH_ARM; | |
110 | } | |
111 | ||
bf2c9f98 | 112 | #endif /* _ASM_ARM_SYSCALL_H */ |