diff options
Diffstat (limited to 'ld/emultempl')
| -rw-r--r-- | ld/emultempl/.Sanitize | 1 | ||||
| -rw-r--r-- | ld/emultempl/ppc.em | 373 |
2 files changed, 0 insertions, 374 deletions
diff --git a/ld/emultempl/.Sanitize b/ld/emultempl/.Sanitize index d8f4821..9730980 100644 --- a/ld/emultempl/.Sanitize +++ b/ld/emultempl/.Sanitize @@ -30,7 +30,6 @@ gld960.em hppaelf.em lnk960.em m88kbcs.em -ppc.em vanilla.em Things-to-lose: diff --git a/ld/emultempl/ppc.em b/ld/emultempl/ppc.em deleted file mode 100644 index 189c8b5..0000000 --- a/ld/emultempl/ppc.em +++ /dev/null @@ -1,373 +0,0 @@ -# This shell script emits a C file. -*- C -*- -# It does some substitutions. -cat >em_${EMULATION_NAME}.c <<EOF -/* This file is is generated by a shell script. DO NOT EDIT! */ - -/* PowerPC/POWER emulation for the linker. - Copyright (C) 1994 Free Software Foundation, Inc. - Written by Ian Lance Taylor, Cygnus Support - -This file is part of GLD, the Gnu Linker. - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ - -/* This file is similar to generic.em. However, we need to build - linker stubs to handle calls to different modules. A PowerPC call - is emitted as a two instruction sequence: - bl .{function} - cror 31,31,31 - - When linking, if the function symbol is defined and in the same - module, we leave it alone (actually, if it is more than 26 bits - away we should treat it as though it were in a different module). - If the function symbol is not defined, we must construct a linker - stub. We reroute the call to go to the linker stub instead, and we - change the cror instruction to reload the TOC register value. The - linker stub looks like this - l r12,{function}(r2) - st r2,20(r1) - l r0,0(r12) - l r2,4(r12) - mtctr r0 - bcc - - Since we do not yet support dynamic linking, all function symbols - are in the same module. However, we still need to create a stub - for an undefined symbol. - - This is actually probably not correct for the PowerPC ABI. - However, I do not have that ABI yet. */ - -#define TARGET_IS_${EMULATION_NAME} - -#include "bfd.h" -#include "sysdep.h" -#include "bfdlink.h" - -/* FIXME! */ -#include "genlink.h" - -#include "ld.h" -#include "config.h" -#include "ldmain.h" -#include "ldemul.h" -#include "ldfile.h" -#include "ldmisc.h" -#include "ldexp.h" -#include "ldlang.h" - -static void gld${EMULATION_NAME}_before_parse PARAMS ((void)); -static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile)); -static void gld${EMULATION_NAME}_create_output_section_statements - PARAMS ((void)); -static void gld${EMULATION_NAME}_before_allocation PARAMS ((void)); -static boolean gld${EMULATION_NAME}_check_symbol - PARAMS ((struct bfd_link_hash_entry *, PTR)); - -static void -gld${EMULATION_NAME}_before_parse() -{ - ldfile_output_architecture = bfd_arch_${ARCH}; -} - -/* Section in which we build stubs. */ - -static asection *stub_sec; - -/* Section in which we build TOC entries for stubs. */ - -static asection *stub_toc_sec; - -/* This is called before the input files are opened. We create a new - fake input file to hold the stub section. */ - -static void -gld${EMULATION_NAME}_create_output_section_statements () -{ - lang_input_statement_type *stub_file; - - stub_file = lang_add_input_file ("linker stubs", - lang_input_file_is_fake_enum, - (char *) NULL); - - stub_file->the_bfd = bfd_create ("linker stubs", output_bfd); - if (stub_file->the_bfd == (bfd *) NULL - || ! bfd_set_arch_mach (stub_file->the_bfd, - bfd_get_arch (output_bfd), - bfd_get_mach (output_bfd))) - { - einfo ("%X%P: can not create BFD: %E"); - return; - } - - stub_sec = bfd_make_section_old_way (stub_file->the_bfd, ".text"); - stub_toc_sec = bfd_make_section_old_way (stub_file->the_bfd, ".toc"); - if (stub_sec == (asection *) NULL - || stub_toc_sec == (asection *) NULL - || ! bfd_set_section_flags (stub_file->the_bfd, stub_sec, - (SEC_HAS_CONTENTS - | SEC_ALLOC - | SEC_LOAD - | SEC_CODE - | SEC_RELOC - | SEC_IN_MEMORY)) - || ! bfd_set_section_flags (stub_file->the_bfd, stub_toc_sec, - (SEC_HAS_CONTENTS - | SEC_ALLOC - | SEC_LOAD - | SEC_DATA - | SEC_RELOC - | SEC_IN_MEMORY))) - { - einfo ("%X%P: can not create stub sections: %E"); - return; - } - - ldlang_add_file (stub_file); -} - -/* This is called after the input sections have been attached to the - output sections but before the output section sizes have been set. - We can identify the required stubs because they are undefined - symbols beginning with ".". For each such symbol, we build a stub - in the .text section. */ - -static void -gld${EMULATION_NAME}_before_allocation () -{ - bfd_link_hash_traverse (link_info.hash, - gld${EMULATION_NAME}_check_symbol, - (PTR) NULL); -} - -/* If a particular symbol is undefined and starts with a ".", then we - need to make a stub for it. */ - -/*ARGSUSED*/ -static boolean -gld${EMULATION_NAME}_check_symbol (h, info) - struct bfd_link_hash_entry *h; - PTR info; -{ - bfd *stub_bfd; - bfd_byte *p; - arelent *r; - struct bfd_link_hash_entry *hnew; - asymbol *sym; - - if (h->type != bfd_link_hash_undefined - || h->root.string[0] != '.') - return true; - - stub_bfd = stub_sec->owner; - - /* Define this symbol to be the current location in stub_sec. */ - h->type = bfd_link_hash_defined; - h->u.def.value = bfd_section_size (stub_bfd, stub_sec); - h->u.def.section = stub_sec; - - /* We want to add this: - LONG (0x81820000) lwz r12,{TOC index}(r2) - LONG (0x90410014) stw r2,20(r1) - LONG (0x800c0000) lwz r0,0(r12) - LONG (0x804c0004) lwz r2,4(r12) - LONG (0x7c0903a6) mtctr r0 - LONG (0x4e800420) bctr - LONG (0) Traceback table - LONG (0xc8000) - LONG (0) - */ - - if (! bfd_set_section_size (stub_bfd, stub_sec, - h->u.def.value + 9 * 4)) - { - einfo ("%P%X: can not set section size: %E"); - return false; - } - - stub_sec->contents = ((bfd_byte *) - xrealloc ((PTR) stub_sec->contents, - bfd_section_size (stub_bfd, stub_sec))); - p = stub_sec->contents + h->u.def.value; - bfd_put_32 (stub_bfd, - (bfd_vma) 0x81820000 + bfd_section_size (stub_bfd, stub_toc_sec), - p); - p += 4; - bfd_put_32 (stub_bfd, (bfd_vma) 0x90410014, p); - p += 4; - bfd_put_32 (stub_bfd, (bfd_vma) 0x800c0000, p); - p += 4; - bfd_put_32 (stub_bfd, (bfd_vma) 0x804c0004, p); - p += 4; - bfd_put_32 (stub_bfd, (bfd_vma) 0x7c0903a6, p); - p += 4; - bfd_put_32 (stub_bfd, (bfd_vma) 0x4e800420, p); - p += 4; - bfd_put_32 (stub_bfd, (bfd_vma) 0, p); - p += 4; - bfd_put_32 (stub_bfd, (bfd_vma) 0xc8000, p); - p += 4; - bfd_put_32 (stub_bfd, (bfd_vma) 0, p); - - /* Add an undefined symbol for the TOC reference. This is the name - without the leading ".". */ - hnew = bfd_link_hash_lookup (link_info.hash, h->root.string + 1, true, - false, true); - if (hnew == (struct bfd_link_hash_entry *) NULL) - einfo ("%P%F: bfd_link_hash_lookup failed: %E"); - if (hnew->type == bfd_link_hash_new) - { - hnew->type = bfd_link_hash_undefined; - hnew->u.undef.abfd = stub_bfd; - bfd_link_add_undef (link_info.hash, hnew); - } - - /* Add a relocation entry for the TOC reference in the first - instruction. */ - ++stub_sec->reloc_count; - stub_sec->relocation = ((arelent *) - xrealloc ((PTR) stub_sec->relocation, - (stub_sec->reloc_count - * sizeof (arelent)))); - r = &stub_sec->relocation[stub_sec->reloc_count - 1]; - r->sym_ptr_ptr = stub_toc_sec->symbol_ptr_ptr; - r->address = h->u.def.value; - if (stub_bfd->xvec->byteorder_big_p) - r->address += 2; - r->addend = 0; - r->howto = bfd_reloc_type_lookup (stub_bfd, BFD_RELOC_PPC_TOC16); - if (r->howto == (reloc_howto_type *) NULL) - einfo ("%P%F: no howto for TOC reference: %E"); - - /* Add a relocation entry in the TOC section. */ - ++stub_toc_sec->reloc_count; - stub_toc_sec->relocation = ((arelent *) - xrealloc ((PTR) stub_toc_sec->relocation, - (stub_toc_sec->reloc_count - * sizeof (arelent)))); - r = &stub_toc_sec->relocation[stub_toc_sec->reloc_count - 1]; - - sym = bfd_make_empty_symbol (stub_bfd); - sym->name = hnew->root.string; - sym->value = 0; - sym->flags = BSF_NO_FLAGS; - sym->section = &bfd_und_section; - sym->udata = NULL; - - /* FIXME! */ - ((struct generic_link_hash_entry *) hnew)->sym = sym; - - r->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); - *r->sym_ptr_ptr = sym; - r->address = bfd_section_size (stub_bfd, stub_toc_sec); - r->addend = 0; - r->howto = bfd_reloc_type_lookup (stub_bfd, BFD_RELOC_32); - if (r->howto == (reloc_howto_type *) NULL) - einfo ("%P%F: no howto for TOC entry: %E"); - - /* Add more space to the .toc section. */ - if (! bfd_set_section_size (stub_bfd, stub_toc_sec, - bfd_section_size (stub_bfd, stub_toc_sec) + 4)) - { - einfo ("%P%X: can not set section size: %E"); - return false; - } - - stub_toc_sec->contents = ((bfd_byte *) - xrealloc ((PTR) stub_toc_sec->contents, - bfd_section_size (stub_bfd, - stub_toc_sec))); - bfd_put_32 (stub_bfd, (bfd_vma) 0, - (stub_toc_sec->contents - + bfd_section_size (stub_bfd, stub_toc_sec) - - 4)); - - return true; -} - -static char * -gld${EMULATION_NAME}_get_script(isfile) - int *isfile; -EOF - -if test -n "$COMPILE_IN" -then -# Scripts compiled in. - -# sed commands to quote an ld script as a C string. -sc='s/["\\]/\\&/g -s/$/\\n\\/ -1s/^/"/ -$s/$/n"/ -' - -cat >>em_${EMULATION_NAME}.c <<EOF -{ - *isfile = 0; - - if (link_info.relocateable == true && config.build_constructors == true) - return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`; - else if (link_info.relocateable == true) - return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`; - else if (!config.text_read_only) - return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`; - else if (!config.magic_demand_paged) - return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`; - else - return `sed "$sc" ldscripts/${EMULATION_NAME}.x`; -} -EOF - -else -# Scripts read from the filesystem. - -cat >>em_${EMULATION_NAME}.c <<EOF -{ - *isfile = 1; - - if (link_info.relocateable == true && config.build_constructors == true) - return "ldscripts/${EMULATION_NAME}.xu"; - else if (link_info.relocateable == true) - return "ldscripts/${EMULATION_NAME}.xr"; - else if (!config.text_read_only) - return "ldscripts/${EMULATION_NAME}.xbn"; - else if (!config.magic_demand_paged) - return "ldscripts/${EMULATION_NAME}.xn"; - else - return "ldscripts/${EMULATION_NAME}.x"; -} -EOF - -fi - -cat >>em_${EMULATION_NAME}.c <<EOF - -struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = -{ - gld${EMULATION_NAME}_before_parse, - syslib_default, - hll_default, - after_parse_default, - after_allocation_default, - set_output_arch_default, - ldemul_default_target, - gld${EMULATION_NAME}_before_allocation, - gld${EMULATION_NAME}_get_script, - "${EMULATION_NAME}", - "${OUTPUT_FORMAT}", - 0, - gld${EMULATION_NAME}_create_output_section_statements -}; -EOF |