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 (1925B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright (C) 2012 ARM Ltd.
      4 */
      5#ifndef __ASM_SYSCALL_H
      6#define __ASM_SYSCALL_H
      7
      8#include <uapi/linux/audit.h>
      9#include <linux/compat.h>
     10#include <linux/err.h>
     11
     12typedef long (*syscall_fn_t)(const struct pt_regs *regs);
     13
     14extern const syscall_fn_t sys_call_table[];
     15
     16#ifdef CONFIG_COMPAT
     17extern const syscall_fn_t compat_sys_call_table[];
     18#endif
     19
     20static inline int syscall_get_nr(struct task_struct *task,
     21				 struct pt_regs *regs)
     22{
     23	return regs->syscallno;
     24}
     25
     26static inline void syscall_rollback(struct task_struct *task,
     27				    struct pt_regs *regs)
     28{
     29	regs->regs[0] = regs->orig_x0;
     30}
     31
     32static inline long syscall_get_return_value(struct task_struct *task,
     33					    struct pt_regs *regs)
     34{
     35	unsigned long val = regs->regs[0];
     36
     37	if (is_compat_thread(task_thread_info(task)))
     38		val = sign_extend64(val, 31);
     39
     40	return val;
     41}
     42
     43static inline long syscall_get_error(struct task_struct *task,
     44				     struct pt_regs *regs)
     45{
     46	unsigned long error = syscall_get_return_value(task, regs);
     47
     48	return IS_ERR_VALUE(error) ? error : 0;
     49}
     50
     51static inline void syscall_set_return_value(struct task_struct *task,
     52					    struct pt_regs *regs,
     53					    int error, long val)
     54{
     55	if (error)
     56		val = error;
     57
     58	if (is_compat_thread(task_thread_info(task)))
     59		val = lower_32_bits(val);
     60
     61	regs->regs[0] = val;
     62}
     63
     64#define SYSCALL_MAX_ARGS 6
     65
     66static inline void syscall_get_arguments(struct task_struct *task,
     67					 struct pt_regs *regs,
     68					 unsigned long *args)
     69{
     70	args[0] = regs->orig_x0;
     71	args++;
     72
     73	memcpy(args, &regs->regs[1], 5 * sizeof(args[0]));
     74}
     75
     76/*
     77 * We don't care about endianness (__AUDIT_ARCH_LE bit) here because
     78 * AArch64 has the same system calls both on little- and big- endian.
     79 */
     80static inline int syscall_get_arch(struct task_struct *task)
     81{
     82	if (is_compat_thread(task_thread_info(task)))
     83		return AUDIT_ARCH_ARM;
     84
     85	return AUDIT_ARCH_AARCH64;
     86}
     87
     88#endif	/* __ASM_SYSCALL_H */