cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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syscall.h (1442B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Access to user system call parameters and results
      4 *
      5 * Copyright (C) 2008 Intel Corp.  Shaohua Li <shaohua.li@intel.com>
      6 *
      7 * See asm-generic/syscall.h for descriptions of what we must do here.
      8 */
      9
     10#ifndef _ASM_SYSCALL_H
     11#define _ASM_SYSCALL_H	1
     12
     13#include <uapi/linux/audit.h>
     14#include <linux/sched.h>
     15#include <linux/err.h>
     16
     17static inline long syscall_get_nr(struct task_struct *task,
     18				  struct pt_regs *regs)
     19{
     20	if ((long)regs->cr_ifs < 0) /* Not a syscall */
     21		return -1;
     22
     23	return regs->r15;
     24}
     25
     26static inline void syscall_rollback(struct task_struct *task,
     27				    struct pt_regs *regs)
     28{
     29	/* do nothing */
     30}
     31
     32static inline long syscall_get_error(struct task_struct *task,
     33				     struct pt_regs *regs)
     34{
     35	return regs->r10 == -1 ? -regs->r8:0;
     36}
     37
     38static inline long syscall_get_return_value(struct task_struct *task,
     39					    struct pt_regs *regs)
     40{
     41	return regs->r8;
     42}
     43
     44static inline void syscall_set_return_value(struct task_struct *task,
     45					    struct pt_regs *regs,
     46					    int error, long val)
     47{
     48	if (error) {
     49		/* error < 0, but ia64 uses > 0 return value */
     50		regs->r8 = -error;
     51		regs->r10 = -1;
     52	} else {
     53		regs->r8 = val;
     54		regs->r10 = 0;
     55	}
     56}
     57
     58extern void syscall_get_arguments(struct task_struct *task,
     59	struct pt_regs *regs, unsigned long *args);
     60
     61static inline int syscall_get_arch(struct task_struct *task)
     62{
     63	return AUDIT_ARCH_IA64;
     64}
     65#endif	/* _ASM_SYSCALL_H */