linux.em revision 78828
1# This shell script emits a C file. -*- C -*- 2# It does some substitutions. 3cat >e${EMULATION_NAME}.c <<EOF 4/* This file is is generated by a shell script. DO NOT EDIT! */ 5 6/* Linux a.out emulation code for ${EMULATION_NAME} 7 Copyright 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000 8 Free Software Foundation, Inc. 9 Written by Steve Chamberlain <sac@cygnus.com> 10 Linux support by Eric Youngdale <ericy@cais.cais.com> 11 12This file is part of GLD, the Gnu Linker. 13 14This program is free software; you can redistribute it and/or modify 15it under the terms of the GNU General Public License as published by 16the Free Software Foundation; either version 2 of the License, or 17(at your option) any later version. 18 19This program is distributed in the hope that it will be useful, 20but WITHOUT ANY WARRANTY; without even the implied warranty of 21MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22GNU General Public License for more details. 23 24You should have received a copy of the GNU General Public License 25along with this program; if not, write to the Free Software 26Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 27 28#define TARGET_IS_${EMULATION_NAME} 29 30#include "bfd.h" 31#include "sysdep.h" 32#include "bfdlink.h" 33 34#include "ld.h" 35#include "ldmain.h" 36#include "ldmisc.h" 37#include "ldexp.h" 38#include "ldlang.h" 39#include "ldfile.h" 40#include "ldemul.h" 41 42static void gld${EMULATION_NAME}_before_parse PARAMS ((void)); 43static boolean gld${EMULATION_NAME}_open_dynamic_archive 44 PARAMS ((const char *, search_dirs_type *, lang_input_statement_type *)); 45static void gld${EMULATION_NAME}_find_address_statement 46 PARAMS ((lang_statement_union_type *)); 47static void gld${EMULATION_NAME}_create_output_section_statements 48 PARAMS ((void)); 49static void gld${EMULATION_NAME}_before_allocation PARAMS ((void)); 50static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile)); 51 52static void 53gld${EMULATION_NAME}_before_parse() 54{ 55 ldfile_output_architecture = bfd_arch_${ARCH}; 56 config.dynamic_link = true; 57 config.has_shared = true; 58} 59 60/* Try to open a dynamic archive. This is where we know that Linux 61 dynamic libraries have an extension of .sa. */ 62 63static boolean 64gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry) 65 const char *arch; 66 search_dirs_type *search; 67 lang_input_statement_type *entry; 68{ 69 char *string; 70 71 if (! entry->is_archive) 72 return false; 73 74 string = (char *) xmalloc (strlen (search->name) 75 + strlen (entry->filename) 76 + strlen (arch) 77 + sizeof "/lib.sa"); 78 79 sprintf (string, "%s/lib%s%s.sa", search->name, entry->filename, arch); 80 81 if (! ldfile_try_open_bfd (string, entry)) 82 { 83 free (string); 84 return false; 85 } 86 87 entry->filename = string; 88 89 return true; 90} 91 92/* This is called by the create_output_section_statements routine via 93 lang_for_each_statement. It locates any address assignment to 94 .text, and modifies it to include the size of the headers. This 95 causes -Ttext to mean the starting address of the header, rather 96 than the starting address of .text, which is compatible with other 97 Linux tools. */ 98 99static void 100gld${EMULATION_NAME}_find_address_statement (s) 101 lang_statement_union_type *s; 102{ 103 if (s->header.type == lang_address_statement_enum 104 && strcmp (s->address_statement.section_name, ".text") == 0) 105 { 106 ASSERT (s->address_statement.address->type.node_class == etree_value); 107 s->address_statement.address->value.value += 0x20; 108 } 109} 110 111/* This is called before opening the input BFD's. */ 112 113static void 114gld${EMULATION_NAME}_create_output_section_statements () 115{ 116 lang_for_each_statement (gld${EMULATION_NAME}_find_address_statement); 117} 118 119/* This is called after the sections have been attached to output 120 sections, but before any sizes or addresses have been set. */ 121 122static void 123gld${EMULATION_NAME}_before_allocation () 124{ 125 if (link_info.relocateable) 126 return; 127 128 /* Let the backend work out the sizes of any sections required by 129 dynamic linking. */ 130 if (! bfd_${EMULATION_NAME}_size_dynamic_sections (output_bfd, &link_info)) 131 einfo ("%P%F: failed to set dynamic section sizes: %E\n"); 132} 133 134static char * 135gld${EMULATION_NAME}_get_script(isfile) 136 int *isfile; 137EOF 138 139if test -n "$COMPILE_IN" 140then 141# Scripts compiled in. 142 143# sed commands to quote an ld script as a C string. 144sc="-f stringify.sed" 145 146cat >>e${EMULATION_NAME}.c <<EOF 147{ 148 *isfile = 0; 149 150 if (link_info.relocateable == true && config.build_constructors == true) 151 return 152EOF 153sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c 154echo ' ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c 155sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c 156echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c 157sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c 158echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c 159sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c 160echo ' ; else return' >> e${EMULATION_NAME}.c 161sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c 162echo '; }' >> e${EMULATION_NAME}.c 163 164else 165# Scripts read from the filesystem. 166 167cat >>e${EMULATION_NAME}.c <<EOF 168{ 169 *isfile = 1; 170 171 if (link_info.relocateable == true && config.build_constructors == true) 172 return "ldscripts/${EMULATION_NAME}.xu"; 173 else if (link_info.relocateable == true) 174 return "ldscripts/${EMULATION_NAME}.xr"; 175 else if (!config.text_read_only) 176 return "ldscripts/${EMULATION_NAME}.xbn"; 177 else if (!config.magic_demand_paged) 178 return "ldscripts/${EMULATION_NAME}.xn"; 179 else 180 return "ldscripts/${EMULATION_NAME}.x"; 181} 182EOF 183 184fi 185 186cat >>e${EMULATION_NAME}.c <<EOF 187 188struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = 189{ 190 gld${EMULATION_NAME}_before_parse, 191 syslib_default, 192 hll_default, 193 after_parse_default, 194 after_open_default, 195 after_allocation_default, 196 set_output_arch_default, 197 ldemul_default_target, 198 gld${EMULATION_NAME}_before_allocation, 199 gld${EMULATION_NAME}_get_script, 200 "${EMULATION_NAME}", 201 "${OUTPUT_FORMAT}", 202 NULL, /* finish */ 203 gld${EMULATION_NAME}_create_output_section_statements, 204 gld${EMULATION_NAME}_open_dynamic_archive, 205 NULL, /* place orphan */ 206 NULL, /* set symbols */ 207 NULL, /* parse args */ 208 NULL, /* unrecognized file */ 209 NULL, /* list options */ 210 NULL, /* recognized file */ 211 NULL /* find_potential_libraries */ 212}; 213EOF 214