projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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, | |
| bf2c9f98 WF |
58 | unsigned long *args) |
| 59 | { | |
| b35f549d SRRH |
60 | args[0] = regs->ARM_ORIG_r0; |
| 61 | args++; | |
| bf2c9f98 | 62 | |
| b35f549d | 63 | memcpy(args, ®s->ARM_r0 + 1, 5 * sizeof(args[0])); |
| bf2c9f98 WF |
64 | } |
| 65 | ||
| 66 | static inline void syscall_set_arguments(struct task_struct *task, | |
| 67 | struct pt_regs *regs, | |
| 68 | unsigned int i, unsigned int n, | |
| 69 | const unsigned long *args) | |
| 70 | { | |
| 3c1532df AT |
71 | if (n == 0) |
| 72 | return; | |
| 73 | ||
| bf2c9f98 | 74 | if (i + n > SYSCALL_MAX_ARGS) { |
| 8b521cb2 JP |
75 | pr_warn("%s called with max args %d, handling only %d\n", |
| 76 | __func__, i + n, SYSCALL_MAX_ARGS); | |
| bf2c9f98 WF |
77 | n = SYSCALL_MAX_ARGS - i; |
| 78 | } | |
| 79 | ||
| 80 | if (i == 0) { | |
| 81 | regs->ARM_ORIG_r0 = args[0]; | |
| 82 | args++; | |
| 83 | i++; | |
| 84 | n--; | |
| 85 | } | |
| 86 | ||
| 87 | memcpy(®s->ARM_r0 + i, args, n * sizeof(args[0])); | |
| 88 | } | |
| 89 | ||
| 5e937a9a | 90 | static inline int syscall_get_arch(void) |
| 1f59d13b WD |
91 | { |
| 92 | /* ARM tasks don't change audit architectures on the fly. */ | |
| 93 | return AUDIT_ARCH_ARM; | |
| 94 | } | |
| 95 | ||
| bf2c9f98 | 96 | #endif /* _ASM_ARM_SYSCALL_H */ |