projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| f1ba1285 RM |
1 | /* |
| 2 | * Access to user system call parameters and results | |
| 3 | * | |
| 4 | * Copyright (C) 2008 Red Hat, Inc. All rights reserved. | |
| 5 | * | |
| 6 | * This copyrighted material is made available to anyone wishing to use, | |
| 7 | * modify, copy, or redistribute it subject to the terms and conditions | |
| 8 | * of the GNU General Public License v.2. | |
| 9 | * | |
| 10 | * See asm-generic/syscall.h for descriptions of what we must do here. | |
| 11 | */ | |
| 12 | ||
| 13 | #ifndef _ASM_SYSCALL_H | |
| 14 | #define _ASM_SYSCALL_H 1 | |
| 15 | ||
| 16 | #include <linux/sched.h> | |
| 17 | ||
| 02424d89 IM |
18 | /* ftrace syscalls requires exporting the sys_call_table */ |
| 19 | #ifdef CONFIG_FTRACE_SYSCALLS | |
| 20 | extern const unsigned long *sys_call_table; | |
| 21 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
| 22 | ||
| f1ba1285 RM |
23 | static inline long syscall_get_nr(struct task_struct *task, |
| 24 | struct pt_regs *regs) | |
| 25 | { | |
| 26 | return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1L; | |
| 27 | } | |
| 28 | ||
| 29 | static inline void syscall_rollback(struct task_struct *task, | |
| 30 | struct pt_regs *regs) | |
| 31 | { | |
| 32 | regs->gpr[3] = regs->orig_gpr3; | |
| 33 | } | |
| 34 | ||
| 35 | static inline long syscall_get_error(struct task_struct *task, | |
| 36 | struct pt_regs *regs) | |
| 37 | { | |
| 409d241b | 38 | return (regs->ccr & 0x10000000) ? -regs->gpr[3] : 0; |
| f1ba1285 RM |
39 | } |
| 40 | ||
| 41 | static inline long syscall_get_return_value(struct task_struct *task, | |
| 42 | struct pt_regs *regs) | |
| 43 | { | |
| 44 | return regs->gpr[3]; | |
| 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 | if (error) { | |
| 409d241b | 52 | regs->ccr |= 0x10000000L; |
| f1ba1285 RM |
53 | regs->gpr[3] = -error; |
| 54 | } else { | |
| 409d241b | 55 | regs->ccr &= ~0x10000000L; |
| f1ba1285 RM |
56 | regs->gpr[3] = val; |
| 57 | } | |
| 58 | } | |
| 59 | ||
| 60 | static inline void syscall_get_arguments(struct task_struct *task, | |
| 61 | struct pt_regs *regs, | |
| 62 | unsigned int i, unsigned int n, | |
| 63 | unsigned long *args) | |
| 64 | { | |
| 65 | BUG_ON(i + n > 6); | |
| 66 | #ifdef CONFIG_PPC64 | |
| 67 | if (test_tsk_thread_flag(task, TIF_32BIT)) { | |
| 68 | /* | |
| 69 | * Zero-extend 32-bit argument values. The high bits are | |
| 70 | * garbage ignored by the actual syscall dispatch. | |
| 71 | */ | |
| 72 | while (n-- > 0) | |
| 73 | args[n] = (u32) regs->gpr[3 + i + n]; | |
| 74 | return; | |
| 75 | } | |
| 76 | #endif | |
| 77 | memcpy(args, ®s->gpr[3 + i], n * sizeof(args[0])); | |
| 78 | } | |
| 79 | ||
| 80 | static inline void syscall_set_arguments(struct task_struct *task, | |
| 81 | struct pt_regs *regs, | |
| 82 | unsigned int i, unsigned int n, | |
| 83 | const unsigned long *args) | |
| 84 | { | |
| 85 | BUG_ON(i + n > 6); | |
| 86 | memcpy(®s->gpr[3 + i], args, n * sizeof(args[0])); | |
| 87 | } | |
| 88 | ||
| 89 | #endif /* _ASM_SYSCALL_H */ |