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111 lines
2.9 KiB
111 lines
2.9 KiB
/* |
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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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