164 lines
3.2 KiB
C
164 lines
3.2 KiB
C
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/*
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* Access to user system call parameters and results
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*
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* Copyright (C) 2008 Intel Corp. Shaohua Li <shaohua.li@intel.com>
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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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_SYSCALL_H
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#define _ASM_SYSCALL_H 1
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#include <linux/sched.h>
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#include <linux/err.h>
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static inline long syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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if ((long)regs->cr_ifs < 0) /* Not a syscall */
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return -1;
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#ifdef CONFIG_IA32_SUPPORT
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if (IS_IA32_PROCESS(regs))
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return regs->r1;
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#endif
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return regs->r15;
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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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#ifdef CONFIG_IA32_SUPPORT
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if (IS_IA32_PROCESS(regs))
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regs->r8 = regs->r1;
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#endif
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/* do nothing */
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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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#ifdef CONFIG_IA32_SUPPORT
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if (IS_IA32_PROCESS(regs))
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return regs->r8;
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#endif
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return regs->r10 == -1 ? regs->r8:0;
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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->r8;
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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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#ifdef CONFIG_IA32_SUPPORT
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if (IS_IA32_PROCESS(regs)) {
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regs->r8 = (long) error ? error : val;
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return;
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}
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#endif
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if (error) {
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/* error < 0, but ia64 uses > 0 return value */
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regs->r8 = -error;
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regs->r10 = -1;
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} else {
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regs->r8 = val;
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regs->r10 = 0;
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}
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}
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extern void ia64_syscall_get_set_arguments(struct task_struct *task,
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struct pt_regs *regs, unsigned int i, unsigned int n,
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unsigned long *args, int rw);
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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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#ifdef CONFIG_IA32_SUPPORT
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if (IS_IA32_PROCESS(regs)) {
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switch (i + n) {
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case 6:
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if (!n--) break;
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*args++ = regs->r13;
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case 5:
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if (!n--) break;
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*args++ = regs->r15;
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case 4:
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if (!n--) break;
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*args++ = regs->r14;
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case 3:
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if (!n--) break;
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*args++ = regs->r10;
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case 2:
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if (!n--) break;
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*args++ = regs->r9;
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case 1:
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if (!n--) break;
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*args++ = regs->r11;
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case 0:
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if (!n--) break;
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default:
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BUG();
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break;
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}
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return;
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}
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#endif
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ia64_syscall_get_set_arguments(task, regs, i, n, 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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unsigned long *args)
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{
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BUG_ON(i + n > 6);
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#ifdef CONFIG_IA32_SUPPORT
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if (IS_IA32_PROCESS(regs)) {
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switch (i + n) {
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case 6:
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if (!n--) break;
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regs->r13 = *args++;
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case 5:
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if (!n--) break;
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regs->r15 = *args++;
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case 4:
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if (!n--) break;
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regs->r14 = *args++;
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case 3:
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if (!n--) break;
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regs->r10 = *args++;
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case 2:
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if (!n--) break;
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regs->r9 = *args++;
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case 1:
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if (!n--) break;
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regs->r11 = *args++;
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case 0:
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if (!n--) break;
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}
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return;
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}
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#endif
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ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
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}
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#endif /* _ASM_SYSCALL_H */
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