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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stub_32.h (2334B)

      1/*
      2 * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
      3 * Licensed under the GPL
      4 */
      5
      6#ifndef __SYSDEP_STUB_H
      7#define __SYSDEP_STUB_H
      8
      9#include <asm/ptrace.h>
     10#include <generated/asm-offsets.h>
     11
     12#define STUB_MMAP_NR __NR_mmap2
     13#define MMAP_OFFSET(o) ((o) >> UM_KERN_PAGE_SHIFT)
     14
     15static inline long stub_syscall0(long syscall)
     16{
     17	long ret;
     18
     19	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall));
     20
     21	return ret;
     22}
     23
     24static inline long stub_syscall1(long syscall, long arg1)
     25{
     26	long ret;
     27
     28	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));
     29
     30	return ret;
     31}
     32
     33static inline long stub_syscall2(long syscall, long arg1, long arg2)
     34{
     35	long ret;
     36
     37	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
     38			"c" (arg2));
     39
     40	return ret;
     41}
     42
     43static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
     44{
     45	long ret;
     46
     47	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
     48			"c" (arg2), "d" (arg3));
     49
     50	return ret;
     51}
     52
     53static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
     54				 long arg4)
     55{
     56	long ret;
     57
     58	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
     59			"c" (arg2), "d" (arg3), "S" (arg4));
     60
     61	return ret;
     62}
     63
     64static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
     65				 long arg4, long arg5)
     66{
     67	long ret;
     68
     69	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
     70			"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));
     71
     72	return ret;
     73}
     74
     75static inline void trap_myself(void)
     76{
     77	__asm("int3");
     78}
     79
     80static inline void remap_stack_and_trap(void)
     81{
     82	__asm__ volatile (
     83		"movl %%esp,%%ebx ;"
     84		"andl %0,%%ebx ;"
     85		"movl %1,%%eax ;"
     86		"movl %%ebx,%%edi ; addl %2,%%edi ; movl (%%edi),%%edi ;"
     87		"movl %%ebx,%%ebp ; addl %3,%%ebp ; movl (%%ebp),%%ebp ;"
     88		"int $0x80 ;"
     89		"addl %4,%%ebx ; movl %%eax, (%%ebx) ;"
     90		"int $3"
     91		: :
     92		"g" (~(UM_KERN_PAGE_SIZE - 1)),
     93		"g" (STUB_MMAP_NR),
     94		"g" (UML_STUB_FIELD_FD),
     95		"g" (UML_STUB_FIELD_OFFSET),
     96		"g" (UML_STUB_FIELD_CHILD_ERR),
     97		"c" (UM_KERN_PAGE_SIZE),
     98		"d" (PROT_READ | PROT_WRITE),
     99		"S" (MAP_FIXED | MAP_SHARED)
    100		:
    101		"memory");
    102}
    103
    104static __always_inline void *get_stub_page(void)
    105{
    106	unsigned long ret;
    107
    108	asm volatile (
    109		"movl %%esp,%0 ;"
    110		"andl %1,%0"
    111		: "=a" (ret)
    112		: "g" (~(UM_KERN_PAGE_SIZE - 1)));
    113
    114	return (void *)ret;
    115}
    116#endif