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/*
* openbsd ELF definitions
*
* Copyright (c) 2013 Stacey D. Son
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TARGET_OS_ELF_H
#define TARGET_OS_ELF_H
#include "target_arch_elf.h"
#include "elf.h"
/* this flag is uneffective under linux too, should be deleted */
#ifndef MAP_DENYWRITE
#define MAP_DENYWRITE 0
#endif
/* should probably go in elf.h */
#ifndef ELIBBAD
#define ELIBBAD 80
#endif
#ifndef ELF_PLATFORM
#define ELF_PLATFORM (NULL)
#endif
#ifndef ELF_HWCAP
#define ELF_HWCAP 0
#endif
#ifdef TARGET_ABI32
#undef ELF_CLASS
#define ELF_CLASS ELFCLASS32
#undef bswaptls
#define bswaptls(ptr) bswap32s(ptr)
#endif
/* max code+data+bss space allocated to elf interpreter */
#define INTERP_MAP_SIZE (32 * 1024 * 1024)
/* max code+data+bss+brk space allocated to ET_DYN executables */
#define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
/* Necessary parameters */
#define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
#define TARGET_ELF_PAGESTART(_v) ((_v) & \
~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1))
#define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1))
#define DLINFO_ITEMS 12
static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc,
abi_ulong stringp,
struct elfhdr *exec,
abi_ulong load_addr,
abi_ulong load_bias,
abi_ulong interp_load_addr,
struct image_info *info)
{
abi_ulong sp;
int size;
abi_ulong u_platform;
const char *k_platform;
const int n = sizeof(elf_addr_t);
sp = p;
u_platform = 0;
k_platform = ELF_PLATFORM;
if (k_platform) {
size_t len = strlen(k_platform) + 1;
sp -= (len + n - 1) & ~(n - 1);
u_platform = sp;
/* FIXME - check return value of memcpy_to_target() for failure */
memcpy_to_target(sp, k_platform, len);
}
/*
* Force 16 byte _final_ alignment here for generality.
*/
sp = sp & ~(abi_ulong)15;
size = (DLINFO_ITEMS + 1) * 2;
if (k_platform) {
size += 2;
}
#ifdef DLINFO_ARCH_ITEMS
size += DLINFO_ARCH_ITEMS * 2;
#endif
size += envc + argc + 2;
size += 1; /* argc itself */
size *= n;
if (size & 15) {
sp -= 16 - (size & 15);
}
/*
* OpenBSD defines elf_addr_t as Elf32_Off / Elf64_Off
*/
#define NEW_AUX_ENT(id, val) do { \
sp -= n; put_user_ual(val, sp); \
sp -= n; put_user_ual(id, sp); \
} while (0)
NEW_AUX_ENT(AT_NULL, 0);
/* There must be exactly DLINFO_ITEMS entries here. */
NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr)));
NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
NEW_AUX_ENT(AT_UID, (abi_ulong)getuid());
NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid());
NEW_AUX_ENT(AT_GID, (abi_ulong)getgid());
NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid());
NEW_AUX_ENT(AT_HWCAP, (abi_ulong)ELF_HWCAP);
NEW_AUX_ENT(AT_CLKTCK, (abi_ulong)sysconf(_SC_CLK_TCK));
if (k_platform) {
NEW_AUX_ENT(AT_PLATFORM, u_platform);
}
#ifdef ARCH_DLINFO
/*
* ARCH_DLINFO must come last so platform specific code can enforce
* special alignment requirements on the AUXV if necessary (eg. PPC).
*/
ARCH_DLINFO;
#endif
#undef NEW_AUX_ENT
sp = loader_build_argptr(envc, argc, sp, stringp);
return sp;
}
#endif /* TARGET_OS_ELF_H */
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