112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/*
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* Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* See asm-generic/syscall.h for descriptions of what we must do here.
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*/
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#ifndef _ASM_TILE_SYSCALL_H
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#define _ASM_TILE_SYSCALL_H
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <linux/audit.h>
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#include <linux/compat.h>
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#include <arch/abi.h>
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/* The array of function pointers for syscalls. */
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extern void *sys_call_table[];
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#ifdef CONFIG_COMPAT
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extern void *compat_sys_call_table[];
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#endif
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/*
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* Only the low 32 bits of orig_r0 are meaningful, so we return int.
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* This importantly ignores the high bits on 64-bit, so comparisons
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* sign-extend the low 32 bits.
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*/
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static inline int syscall_get_nr(struct task_struct *t, struct pt_regs *regs)
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{
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return regs->regs[TREG_SYSCALL_NR];
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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regs->regs[0] = regs->orig_r0;
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}
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static inline long syscall_get_error(struct task_struct *task,
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struct pt_regs *regs)
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{
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unsigned long error = regs->regs[0];
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return IS_ERR_VALUE(error) ? error : 0;
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->regs[0];
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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if (error) {
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/* R0 is the passed-in negative error, R1 is positive. */
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regs->regs[0] = error;
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regs->regs[1] = -error;
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} else {
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/* R1 set to zero to indicate no error. */
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regs->regs[0] = val;
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regs->regs[1] = 0;
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}
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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BUG_ON(i + n > 6);
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memcpy(args, ®s[i], n * sizeof(args[0]));
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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const unsigned long *args)
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{
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BUG_ON(i + n > 6);
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memcpy(®s[i], args, n * sizeof(args[0]));
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}
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/*
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* We don't care about endianness (__AUDIT_ARCH_LE bit) here because
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* tile has the same system calls both on little- and big- endian.
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*/
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static inline int syscall_get_arch(void)
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{
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if (is_compat_task())
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return AUDIT_ARCH_TILEGX32;
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#ifdef CONFIG_TILEGX
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return AUDIT_ARCH_TILEGX;
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#else
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return AUDIT_ARCH_TILEPRO;
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#endif
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}
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#endif /* _ASM_TILE_SYSCALL_H */
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