310 lines
8.2 KiB
C++
310 lines
8.2 KiB
C++
/*
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Copyright 2017 Wolfgang Thaller.
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This file is part of Retro68.
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Retro68 is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Retro68 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Retro68. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "Elf2Mac.h"
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#include "SegmentMap.h"
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#include <iomanip>
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#include <iostream>
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#include <sstream>
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#include <string>
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#include <boost/algorithm/string/replace.hpp>
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using std::string;
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const char * scriptStart = R"ld(/* ld script for Elf2Mac */
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ENTRY( @entryPoint@ )
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SECTIONS
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{
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)ld";
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const char * textSection = R"ld(/* ld script for Elf2Mac */
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.text : {
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_stext = . ;
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PROVIDE(_rsrc_start = .);
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*(.rsrcheader)
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. = ALIGN (2);
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/* The entry point. */
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_entry_trampoline = .;
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SHORT(DEFINED(__break_on_entry) ? 0xA9FF : 0x4e71);
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LONG(0x61000002); /* bsr *+2 */
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SHORT(0x0697); /* addi.l #_, (a7) */
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LONG(@entryPoint@ - _entry_trampoline - 6);
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PROVIDE(_start = .); /* fallback entry point to a safe spot - needed for libretro bootstrap */
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Retro68InitMultisegApp = .; /* override this for the single-segment case */
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SHORT(0x4e75); /* rts */
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*(.relocvars)
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*/libretrocrt.a:start.c.obj(.text*)
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*/libretrocrt.a:relocate.c.obj(.text*)
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*/libretrocrt.a:*(.text*)
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*/libInterface.a:*(.text*)
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*(.text*)
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*(.stub)
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*(.gnu.linkonce.t*)
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*(.glue_7t)
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*(.glue_7)
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*(.jcr)
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. = ALIGN (4) ;
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__init_section = . ;
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KEEP (*(.init))
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__init_section_end = . ;
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__fini_section = . ;
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KEEP (*(.fini))
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__fini_section_end = . ;
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__EH_FRAME_BEGIN__ = .;
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KEEP(*(.eh_frame))
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LONG(0);
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KEEP(*(.gcc_except_table))
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KEEP(*(.gcc_except_table.*))
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/* NOTE: Elf2Mac expects the sections to be contiguous,
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so include the alignment before the end of this section.
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*/
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. = ALIGN(0x4) ;
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_etext = . ;
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}
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)ld";
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const char * scriptEnd = R"ld(
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.data : {
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_sdata = . ;
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*(.got.plt)
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*(.got)
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FILL(0) ;
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. = ALIGN(0x20) ;
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LONG(-1)
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. = ALIGN(0x20) ;
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*(.rodata)
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*(.rodata1)
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*(.rodata.*)
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*(.gnu.linkonce.r*)
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*(.data)
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*(.data1)
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*(.data.*)
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*(.gnu.linkonce.d*)
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. = ALIGN(4) ;
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__CTOR_LIST__ = .;
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KEEP (*(.ctors))
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KEEP (*(SORT(.ctors.*)))
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__CTOR_END__ = .;
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LONG(0);
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. = ALIGN(0x4);
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__DTOR_LIST__ = .;
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KEEP (*(.dtors))
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KEEP (*(SORT(.dtors.*)))
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__DTOR_END__ = .;
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LONG(0);
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. = ALIGN(0x4);
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_edata = . ;
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}
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.bss ALIGN(0x4) : {
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_sbss = .;
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*(.dynsbss)
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*(.sbss)
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*(.sbss.*)
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*(.scommon)
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*(.dynbss)
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*(.bss)
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*(.bss.*)
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*(.bss*)
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*(.gnu.linkonce.b*)
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*(COMMON)
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. = ALIGN(0x10) ;
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_ebss = . ;
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}
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/* **** Debugging information sections.
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* Keep them for now, they are discarded by Elf2Mac. */
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/DISCARD/ : { *(.note.GNU-stack) }
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/* Stabs debugging sections. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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/* DWARF debug sections.
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Symbols in the DWARF debugging sections are relative to the beginning
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of the section so we begin them at 0. */
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/* DWARF 1 */
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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/* GNU DWARF 1 extensions */
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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/* DWARF 1.1 and DWARF 2 */
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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/* DWARF 2 */
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.debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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/* SGI/MIPS DWARF 2 extensions */
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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/DISCARD/ : { *(*) }
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}
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)ld";
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void CreateFlatLdScript(std::ostream& out, string entryPoint, bool stripMacsbug)
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{
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out << "_MULTISEG_APP = 0;\n";
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out << boost::replace_all_copy<string>(scriptStart, "@entryPoint@", entryPoint);
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if(stripMacsbug)
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{
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out << "\t.strippedmacsbugnames 0 (NOLOAD) : { *(.text.*.macsbug) }\n";
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out << "\t. = 0;\n";
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}
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out << boost::replace_all_copy<string>(textSection, "@entryPoint@", entryPoint) << scriptEnd;
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}
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void SegmentInfo::WriteFilters(std::ostream &out, string section)
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{
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for(string filter : filters)
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{
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out << " " << filter << "(" << section << ")\n";
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out << " " << filter << "(" << section << ".*)\n";
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}
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}
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void SegmentInfo::WriteFiltersKeep(std::ostream &out, string section)
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{
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for(string filter : filters)
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{
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out << "\t\tKEEP(" << filter << "(" << section << "))\n";
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out << "\t\tKEEP(" << filter << "(" << section << ".*))\n";
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}
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}
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void SegmentInfo::CreateLdScript(std::ostream &out, string entryPoint)
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{
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std::ostringstream ss;
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ss << std::setw(5) << std::setfill('0') << id;
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const std::string zero_padded_id = ss.str();
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out << "\t.code" << zero_padded_id << " : {\n";
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out << "\t\tFILL(0x4E71);\n";
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if(id == 1)
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{
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out << boost::replace_all_copy<string>(R"ld(
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_stext = .;
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FILL(0x4E71);
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PROVIDE(_rsrc_start = .);
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. = ALIGN (2);
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_entry_trampoline = .;
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SHORT(DEFINED(__break_on_entry) ? 0xA9FF : 0x4e71);
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LONG(0x61000002); /* bsr *+2 */
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SHORT(0x0697); /* addi.l #_, (a7) */
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LONG(@entryPoint@ - _entry_trampoline - 6);
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PROVIDE(_start = .); /* fallback entry point to a safe spot - needed for libretro bootstrap */
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SHORT(0x4e75); /* rts */
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FILL(0);
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*(.relocvars)
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FILL(0x4E71);
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)ld", "@entryPoint@", entryPoint);
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}
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WriteFilters(out, ".text");
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if(id == 2)
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{
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out << "\t\t*(.gnu.linkonce.t*)\n";
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}
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if(id == 1)
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{
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out << R"ld(
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. = ALIGN (4) ;
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__init_section = .;
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KEEP (*(.init))
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__init_section_end = .;
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__fini_section = .;
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KEEP (*(.fini))
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__fini_section_end = .;
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)ld";
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}
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out << "\t\t. = ALIGN (4);\n"; // this is important, for some reason.
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if(id == 1)
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out << "\t\t__EH_FRAME_BEGIN__" << " = .;\n";
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else
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out << "\t\t__EH_FRAME_BEGIN__" << zero_padded_id << " = .;\n";
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WriteFiltersKeep(out, ".eh_frame");
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out << "\t\tLONG(0);\n";
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WriteFiltersKeep(out, ".gcc_except_table");
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if(id == 1)
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{
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out << R"ld(
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. = ALIGN(0x4) ;
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_etext = . ;
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)ld";
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}
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else
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{
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out << boost::replace_all_copy<string>(R"ld(
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. = ALIGN(0x4);
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FILL(0);
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. += 32;
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LONG(__EH_FRAME_BEGIN__@N@ - .);
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)ld", "@N@", zero_padded_id);
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}
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out << "\t}\n";
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}
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void SegmentMap::CreateLdScript(std::ostream &out, string entryPoint, bool stripMacsbug)
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{
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out << "_MULTISEG_APP = 1;\n";
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out << boost::replace_all_copy<string>(scriptStart, "@entryPoint@", entryPoint);
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if(stripMacsbug)
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{
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out << "\t.strippedmacsbugnames 0 (NOLOAD) : { *(.text.*.macsbug) }\n";
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out << "\t. = 0;\n";
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}
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for(SegmentInfo& seg: segments)
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{
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seg.CreateLdScript(out, entryPoint);
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}
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out << scriptEnd;
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}
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