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123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*
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* Initialization code for .so modules
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*
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* Copyright (C) 2020 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#if 0
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#pragma makedep unix
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#endif
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#include "config.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <dlfcn.h>
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#ifdef HAVE_ELF_H
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# include <elf.h>
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#endif
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#ifdef HAVE_LINK_H
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# include <link.h>
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#endif
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#include "windef.h"
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#ifdef __FreeBSD__
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/* The PT_LOAD segments are sorted in increasing order, and the first
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* starts at the beginning of the ELF file. By parsing the file, we can
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* find that first PT_LOAD segment, from which we can find the base
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* address it wanted, and knowing mapbase where the binary was actually
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* loaded, use them to work out the relocbase offset. */
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static BOOL get_relocbase(caddr_t mapbase, caddr_t *relocbase)
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{
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Elf_Half i;
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#ifdef _WIN64
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const Elf64_Ehdr *elf_header = (Elf64_Ehdr*) mapbase;
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#else
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const Elf32_Ehdr *elf_header = (Elf32_Ehdr*) mapbase;
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#endif
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const Elf_Phdr *prog_header = (const Elf_Phdr *)(mapbase + elf_header->e_phoff);
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for (i = 0; i < elf_header->e_phnum; i++)
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{
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if (prog_header->p_type == PT_LOAD)
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{
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caddr_t desired_base = (caddr_t)((prog_header->p_vaddr / prog_header->p_align) * prog_header->p_align);
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*relocbase = (caddr_t) (mapbase - desired_base);
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return TRUE;
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}
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prog_header++;
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}
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return FALSE;
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}
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#endif
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/*************************************************************************
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* __wine_init_so_dll
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*/
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void __wine_init_so_dll(void)
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{
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#if defined(HAVE_DLADDR1) || (defined(HAVE_DLINFO) && defined(RTLD_SELF))
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struct link_map *map;
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void (*init_func)(int, char **, char **) = NULL;
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void (**init_array)(int, char **, char **) = NULL;
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long i, init_arraysz = 0;
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#ifdef _WIN64
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const Elf64_Dyn *dyn;
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#else
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const Elf32_Dyn *dyn;
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#endif
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#ifdef HAVE_DLADDR1
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Dl_info info;
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if (!dladdr1( __wine_init_so_dll, &info, (void **)&map, RTLD_DL_LINKMAP )) return;
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#else
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if (dlinfo( RTLD_SELF, RTLD_DI_LINKMAP, &map )) return;
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#endif
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for (dyn = map->l_ld; dyn->d_tag; dyn++)
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{
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caddr_t relocbase = (caddr_t)map->l_addr;
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#ifdef __FreeBSD__
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/* On older FreeBSD versions, l_addr was the absolute load address, now it's the relocation offset. */
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if (offsetof(struct link_map, l_addr) == 0)
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if (!get_relocbase(map->l_addr, &relocbase))
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return;
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#endif
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switch (dyn->d_tag)
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{
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case 0x60009994: init_array = (void *)(relocbase + dyn->d_un.d_val); break;
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case 0x60009995: init_arraysz = dyn->d_un.d_val; break;
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case 0x60009996: init_func = (void *)(relocbase + dyn->d_un.d_val); break;
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}
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}
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if (init_func) init_func( 0, NULL, NULL );
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if (init_array)
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for (i = 0; i < init_arraysz / sizeof(*init_array); i++)
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init_array[i]( 0, NULL, NULL );
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#endif
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}
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