cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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target_os_elf.h (4741B)

      1/*
      2 *  openbsd ELF definitions
      3 *
      4 *  Copyright (c) 2013 Stacey D. Son
      5 *
      6 *  This program is free software; you can redistribute it and/or modify
      7 *  it under the terms of the GNU General Public License as published by
      8 *  the Free Software Foundation; either version 2 of the License, or
      9 *  (at your option) any later version.
     10 *
     11 *  This program is distributed in the hope that it will be useful,
     12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14 *  GNU General Public License for more details.
     15 *
     16 *  You should have received a copy of the GNU General Public License
     17 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
     18 */
     19#ifndef _TARGET_OS_ELF_H_
     20#define _TARGET_OS_ELF_H_
     21
     22#include "target_arch_elf.h"
     23#include "elf.h"
     24
     25/* this flag is uneffective under linux too, should be deleted */
     26#ifndef MAP_DENYWRITE
     27#define MAP_DENYWRITE 0
     28#endif
     29
     30/* should probably go in elf.h */
     31#ifndef ELIBBAD
     32#define ELIBBAD 80
     33#endif
     34
     35#ifndef ELF_PLATFORM
     36#define ELF_PLATFORM (NULL)
     37#endif
     38
     39#ifndef ELF_HWCAP
     40#define ELF_HWCAP 0
     41#endif
     42
     43#ifdef TARGET_ABI32
     44#undef ELF_CLASS
     45#define ELF_CLASS ELFCLASS32
     46#undef bswaptls
     47#define bswaptls(ptr) bswap32s(ptr)
     48#endif
     49
     50/* max code+data+bss space allocated to elf interpreter */
     51#define INTERP_MAP_SIZE (32 * 1024 * 1024)
     52
     53/* max code+data+bss+brk space allocated to ET_DYN executables */
     54#define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
     55
     56/* Necessary parameters */
     57#define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
     58#define TARGET_ELF_PAGESTART(_v) ((_v) & \
     59        ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1))
     60#define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1))
     61
     62#define DLINFO_ITEMS 12
     63
     64static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc,
     65                                          abi_ulong stringp,
     66                                          struct elfhdr *exec,
     67                                          abi_ulong load_addr,
     68                                          abi_ulong load_bias,
     69                                          abi_ulong interp_load_addr,
     70                                          struct image_info *info)
     71{
     72        abi_ulong sp;
     73        int size;
     74        abi_ulong u_platform;
     75        const char *k_platform;
     76        const int n = sizeof(elf_addr_t);
     77
     78        sp = p;
     79        u_platform = 0;
     80        k_platform = ELF_PLATFORM;
     81        if (k_platform) {
     82            size_t len = strlen(k_platform) + 1;
     83            sp -= (len + n - 1) & ~(n - 1);
     84            u_platform = sp;
     85            /* FIXME - check return value of memcpy_to_target() for failure */
     86            memcpy_to_target(sp, k_platform, len);
     87        }
     88        /*
     89         * Force 16 byte _final_ alignment here for generality.
     90         */
     91        sp = sp & ~(abi_ulong)15;
     92        size = (DLINFO_ITEMS + 1) * 2;
     93        if (k_platform) {
     94            size += 2;
     95        }
     96#ifdef DLINFO_ARCH_ITEMS
     97        size += DLINFO_ARCH_ITEMS * 2;
     98#endif
     99        size += envc + argc + 2;
    100        size += 1;                        /* argc itself */
    101        size *= n;
    102        if (size & 15) {
    103            sp -= 16 - (size & 15);
    104        }
    105
    106        /*
    107         * OpenBSD defines elf_addr_t as Elf32_Off / Elf64_Off
    108         */
    109#define NEW_AUX_ENT(id, val) do {               \
    110            sp -= n; put_user_ual(val, sp);     \
    111            sp -= n; put_user_ual(id, sp);      \
    112          } while (0)
    113
    114        NEW_AUX_ENT(AT_NULL, 0);
    115
    116        /* There must be exactly DLINFO_ITEMS entries here.  */
    117        NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
    118        NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr)));
    119        NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
    120        NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
    121        NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
    122        NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
    123        NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
    124        NEW_AUX_ENT(AT_UID, (abi_ulong)getuid());
    125        NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid());
    126        NEW_AUX_ENT(AT_GID, (abi_ulong)getgid());
    127        NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid());
    128        NEW_AUX_ENT(AT_HWCAP, (abi_ulong)ELF_HWCAP);
    129        NEW_AUX_ENT(AT_CLKTCK, (abi_ulong)sysconf(_SC_CLK_TCK));
    130        if (k_platform) {
    131            NEW_AUX_ENT(AT_PLATFORM, u_platform);
    132        }
    133#ifdef ARCH_DLINFO
    134        /*
    135         * ARCH_DLINFO must come last so platform specific code can enforce
    136         * special alignment requirements on the AUXV if necessary (eg. PPC).
    137         */
    138        ARCH_DLINFO;
    139#endif
    140#undef NEW_AUX_ENT
    141
    142        sp = loader_build_argptr(envc, argc, sp, stringp);
    143        return sp;
    144}
    145
    146#endif /* _TARGET_OS_ELF_H_ */