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Retro68/Elf2Mac/LdScript.cc
Wolfgang Thaller 529d88a195 linker script: pass debug info through nicely.
2021-05-24 16:18:17 +02:00

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/*
Copyright 2017 Wolfgang Thaller.
This file is part of Retro68.
Retro68 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 3 of the License, or
(at your option) any later version.
Retro68 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 Retro68. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Elf2Mac.h"
#include "SegmentMap.h"
#include <iostream>
#include <boost/algorithm/string/replace.hpp>
#include <boost/lexical_cast.hpp>
#include <string>
using std::string;
const char * scriptStart = R"ld(/* ld script for Elf2Mac */
ENTRY( @entryPoint@ )
PHDRS
{
text PT_LOAD;
bss PT_LOAD;
}
SECTIONS
{
)ld";
const char * textSection = R"ld(/* ld script for Elf2Mac */
.text : {
_stext = . ;
PROVIDE(_rsrc_start = .);
*(.rsrcheader)
. = ALIGN (2);
/* The entry point. */
_entry_trampoline = .;
SHORT(DEFINED(__break_on_entry) ? 0xA9FF : 0x4e71);
LONG(0x61000002); /* bsr *+2 */
SHORT(0x0697); /* addi.l #_, (a7) */
LONG(@entryPoint@ - _entry_trampoline - 6);
PROVIDE(_start = .); /* fallback entry point to a safe spot - needed for libretro bootstrap */
Retro68InitMultisegApp = .; /* override this for the single-segment case */
SHORT(0x4e75); /* rts */
*(.relocvars)
*/libretrocrt.a:start.c.obj(.text*)
*/libretrocrt.a:relocate.c.obj(.text*)
*/libretrocrt.a:*(.text*)
*/libInterface.a:*(.text*)
*(.text*)
*(.stub)
*(.gnu.linkonce.t*)
*(.glue_7t)
*(.glue_7)
*(.jcr)
. = ALIGN (4) ;
__init_section = . ;
KEEP (*(.init))
__init_section_end = . ;
__fini_section = . ;
KEEP (*(.fini))
__fini_section_end = . ;
__EH_FRAME_BEGIN__ = .;
KEEP(*(.eh_frame))
LONG(0);
KEEP(*(.gcc_except_table))
KEEP(*(.gcc_except_table.*))
/* NOTE: Elf2Mac expects the sections to be contiguous,
so include the alignment before the end of this section.
*/
. = ALIGN(0x4) ;
_etext = . ;
} : text
)ld";
const char * scriptEnd = R"ld(
.data : {
_sdata = . ;
*(.got.plt)
*(.got)
FILL(0) ;
. = ALIGN(0x20) ;
LONG(-1)
. = ALIGN(0x20) ;
*(.rodata)
*(.rodata1)
*(.rodata.*)
*(.gnu.linkonce.r*)
*(.data)
*(.data1)
*(.data.*)
*(.gnu.linkonce.d*)
. = ALIGN(4) ;
__CTOR_LIST__ = .;
KEEP (*(.ctors))
KEEP (*(SORT(.ctors.*)))
__CTOR_END__ = .;
LONG(0);
. = ALIGN(0x4);
__DTOR_LIST__ = .;
KEEP (*(.dtors))
KEEP (*(SORT(.dtors.*)))
__DTOR_END__ = .;
LONG(0);
. = ALIGN(0x4);
_edata = . ;
} : @data_segment@
.bss ALIGN(0x4) : {
_sbss = .;
*(.dynsbss)
*(.sbss)
*(.sbss.*)
*(.scommon)
*(.dynbss)
*(.bss)
*(.bss.*)
*(.bss*)
*(.gnu.linkonce.b*)
*(COMMON)
. = ALIGN(0x10) ;
_ebss = . ;
} : @bss_segment@
/* DWARF debug sections.
Symbols in the DWARF debugging sections are relative to the beginning
of the section so we begin them at 0. */
/* DWARF 1 */
.debug 0 : { *(.debug) }
.line 0 : { *(.line) }
/* GNU DWARF 1 extensions */
.debug_srcinfo 0 : { *(.debug_srcinfo) }
.debug_sfnames 0 : { *(.debug_sfnames) }
/* DWARF 1.1 and DWARF 2 */
.debug_aranges 0 : { *(.debug_aranges) }
.debug_pubnames 0 : { *(.debug_pubnames) }
/* DWARF 2 */
.debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
.debug_abbrev 0 : { *(.debug_abbrev) }
.debug_line 0 : { *(.debug_line .debug_line.* .debug_line_end) }
.debug_frame 0 : { *(.debug_frame) }
.debug_str 0 : { *(.debug_str) }
.debug_loc 0 : { *(.debug_loc) }
.debug_macinfo 0 : { *(.debug_macinfo) }
/* SGI/MIPS DWARF 2 extensions */
.debug_weaknames 0 : { *(.debug_weaknames) }
.debug_funcnames 0 : { *(.debug_funcnames) }
.debug_typenames 0 : { *(.debug_typenames) }
.debug_varnames 0 : { *(.debug_varnames) }
/* DWARF 3 */
.debug_pubtypes 0 : { *(.debug_pubtypes) }
.debug_ranges 0 : { *(.debug_ranges) }
/* DWARF Extension. */
.debug_macro 0 : { *(.debug_macro) }
.debug_addr 0 : { *(.debug_addr) }
}
)ld";
void CreateFlatLdScript(std::ostream& out, string entryPoint, bool stripMacsbug)
{
out << "_MULTISEG_APP = 0;\n";
out << boost::replace_all_copy<string>(scriptStart, "@entryPoint@", entryPoint);
if(stripMacsbug)
{
out << "\t.strippedmacsbugnames 0 (NOLOAD) : { *(.text.*.macsbug) }\n";
out << "\t. = 0;\n";
}
out << boost::replace_all_copy<string>(textSection, "@entryPoint@", entryPoint) <<
boost::replace_all_copy<string>(boost::replace_all_copy<string>(scriptEnd, "@data_segment@", "text"), "@bss_segment@", "bss");
}
void SegmentInfo::WriteFilters(std::ostream &out, string section)
{
for(string filter : filters)
{
out << " " << filter << "(" << section << ")\n";
out << " " << filter << "(" << section << ".*)\n";
}
}
void SegmentInfo::WriteFiltersKeep(std::ostream &out, string section)
{
for(string filter : filters)
{
out << "\t\tKEEP(" << filter << "(" << section << "))\n";
out << "\t\tKEEP(" << filter << "(" << section << ".*))\n";
}
}
void SegmentInfo::CreateLdScript(std::ostream &out, string entryPoint)
{
out << "\t.code" << id << " : {\n";
out << "\t\tFILL(0x4E71);\n";
if(id == 1)
{
out << boost::replace_all_copy<string>(R"ld(
_stext = .;
FILL(0x4E71);
PROVIDE(_rsrc_start = .);
. = ALIGN (2);
_entry_trampoline = .;
SHORT(DEFINED(__break_on_entry) ? 0xA9FF : 0x4e71);
LONG(0x61000002); /* bsr *+2 */
SHORT(0x0697); /* addi.l #_, (a7) */
LONG(@entryPoint@ - _entry_trampoline - 6);
PROVIDE(_start = .); /* fallback entry point to a safe spot - needed for libretro bootstrap */
SHORT(0x4e75); /* rts */
FILL(0);
*(.relocvars)
FILL(0x4E71);
)ld", "@entryPoint@", entryPoint);
}
WriteFilters(out, ".text");
if(id == 2)
{
out << "\t\t*(.gnu.linkonce.t*)\n";
}
if(id == 1)
{
out << R"ld(
. = ALIGN (4) ;
__init_section = .;
KEEP (*(.init))
__init_section_end = .;
__fini_section = .;
KEEP (*(.fini))
__fini_section_end = .;
)ld";
}
out << "\t\t. = ALIGN (4);\n"; // this is important, for some reason.
if(id == 1)
out << "\t\t__EH_FRAME_BEGIN__" << " = .;\n";
else
out << "\t\t__EH_FRAME_BEGIN__" << id << " = .;\n";
WriteFiltersKeep(out, ".eh_frame");
out << "\t\tLONG(0);\n";
WriteFiltersKeep(out, ".gcc_except_table");
if(id == 1)
{
out << R"ld(
. = ALIGN(0x4) ;
_etext = . ;
)ld";
}
else
{
out << boost::replace_all_copy<string>(R"ld(
. = ALIGN(0x4);
FILL(0);
. += 32;
LONG(__EH_FRAME_BEGIN__@N@ - .);
)ld", "@N@", boost::lexical_cast<string>(id));
}
out << "\t} : code" << id << "\n";
}
void SegmentMap::CreateLdScript(std::ostream &out, string entryPoint, bool stripMacsbug)
{
int maxId = std::max_element(segments.begin(), segments.end(), [](const auto& a, const auto& b) { return a.id < b.id; })->id;
out << "/* ld script for Elf2Mac */\n";
out << "_MULTISEG_APP = 1;\n";
out << "ENTRY( " << entryPoint << " )\n";
out << "PHDRS\n{\n";
for(int id = 1; id <= maxId; id++)
out << "code" << id << " PT_LOAD" << ";\n";
out << "data" << " PT_LOAD" << ";\n";
out << "}\nSECTIONS\n{\n";
if(stripMacsbug)
{
out << "\t.strippedmacsbugnames 0 (NOLOAD) : { *(.text.*.macsbug) }\n";
out << "\t. = 0;\n";
}
for(SegmentInfo& seg: segments)
{
seg.CreateLdScript(out, entryPoint);
}
out << boost::replace_all_copy<string>(boost::replace_all_copy<string>(scriptEnd, "@data_segment@", "data"), "@bss_segment@", "data");
}
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