projects / deliverable / linux.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 | ||
| 18 | static inline long syscall_get_nr(struct task_struct *task, | |
| 19 | struct pt_regs *regs) | |
| 20 | { | |
| 21 | return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1L; | |
| 22 | } | |
| 23 | ||
| 24 | static inline void syscall_rollback(struct task_struct *task, | |
| 25 | struct pt_regs *regs) | |
| 26 | { | |
| 27 | regs->gpr[3] = regs->orig_gpr3; | |
| 28 | } | |
| 29 | ||
| 30 | static inline long syscall_get_error(struct task_struct *task, | |
| 31 | struct pt_regs *regs) | |
| 32 | { | |
| 33 | return (regs->ccr & 0x1000) ? -regs->gpr[3] : 0; | |
| 34 | } | |
| 35 | ||
| 36 | static inline long syscall_get_return_value(struct task_struct *task, | |
| 37 | struct pt_regs *regs) | |
| 38 | { | |
| 39 | return regs->gpr[3]; | |
| 40 | } | |
| 41 | ||
| 42 | static inline void syscall_set_return_value(struct task_struct *task, | |
| 43 | struct pt_regs *regs, | |
| 44 | int error, long val) | |
| 45 | { | |
| 46 | if (error) { | |
| 47 | regs->ccr |= 0x1000L; | |
| 48 | regs->gpr[3] = -error; | |
| 49 | } else { | |
| 50 | regs->ccr &= ~0x1000L; | |
| 51 | regs->gpr[3] = val; | |
| 52 | } | |
| 53 | } | |
| 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 | { | |
| 60 | BUG_ON(i + n > 6); | |
| 61 | #ifdef CONFIG_PPC64 | |
| 62 | if (test_tsk_thread_flag(task, TIF_32BIT)) { | |
| 63 | /* | |
| 64 | * Zero-extend 32-bit argument values. The high bits are | |
| 65 | * garbage ignored by the actual syscall dispatch. | |
| 66 | */ | |
| 67 | while (n-- > 0) | |
| 68 | args[n] = (u32) regs->gpr[3 + i + n]; | |
| 69 | return; | |
| 70 | } | |
| 71 | #endif | |
| 72 | memcpy(args, ®s->gpr[3 + i], n * sizeof(args[0])); | |
| 73 | } | |
| 74 | ||
| 75 | static inline void syscall_set_arguments(struct task_struct *task, | |
| 76 | struct pt_regs *regs, | |
| 77 | unsigned int i, unsigned int n, | |
| 78 | const unsigned long *args) | |
| 79 | { | |
| 80 | BUG_ON(i + n > 6); | |
| 81 | memcpy(®s->gpr[3 + i], args, n * sizeof(args[0])); | |
| 82 | } | |
| 83 | ||
| 84 | #endif /* _ASM_SYSCALL_H */ |