mirror of
https://github.com/zeldaret/oot.git
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263 lines
12 KiB
C
263 lines
12 KiB
C
#include <ctype.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "spec.h"
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#include "util.h"
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// Note: *SECTION ALIGNMENT* Object files built with a compiler such as GCC can, by default, use narrower
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// alignment for sections size, compared to IDO padding sections to a 0x10-aligned size.
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// To properly generate relocations relative to section starts, sections currently need to be aligned
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// explicitly (to 0x10 currently, a narrower alignment might work), otherwise the linker does implicit alignment
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// and inserts padding between the address indicated by section start symbols (such as *SegmentRoDataStart) and
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// the actual aligned start of the section.
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// With IDO, the padding of sections to an aligned size makes the section start at aligned addresses out of the box,
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// so the explicit alignment has no further effect.
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struct Segment *g_segments;
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int g_segmentsCount;
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static void write_ld_script(FILE *fout)
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{
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int i;
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int j;
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fputs("OUTPUT_ARCH (mips)\n\n"
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"SECTIONS {\n"
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" _RomSize = 0;\n"
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" _RomStart = _RomSize;\n\n",
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fout);
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for (i = 0; i < g_segmentsCount; i++)
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{
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const struct Segment *seg = &g_segments[i];
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// align start of ROM segment
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if (seg->fields & (1 << STMT_romalign))
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fprintf(fout, " _RomSize = (_RomSize + %i) & ~ %i;\n", seg->romalign - 1, seg->romalign - 1);
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// initialized data (.text, .data, .rodata, .sdata)
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fprintf(fout, " _%sSegmentRomStartTemp = _RomSize;\n"
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" _%sSegmentRomStart = _%sSegmentRomStartTemp;\n"
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" ..%s ", seg->name, seg->name, seg->name, seg->name);
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if (seg->fields & (1 << STMT_after))
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fprintf(fout, "(_%sSegmentEnd + %i) & ~ %i ", seg->after, seg->align - 1, seg->align - 1);
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else if (seg->fields & (1 << STMT_number))
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fprintf(fout, "0x%02X000000 ", seg->number);
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else if (seg->fields & (1 << STMT_address))
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fprintf(fout, "0x%08X ", seg->address);
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else
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fprintf(fout, "ALIGN(0x%X) ", seg->align);
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// (AT(_RomSize) isn't necessary, but adds useful "load address" lines to the map file)
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fprintf(fout, ": AT(_RomSize)\n {\n"
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" _%sSegmentStart = .;\n"
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" . = ALIGN(0x10);\n"
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" _%sSegmentTextStart = .;\n",
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seg->name, seg->name);
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for (j = 0; j < seg->includesCount; j++)
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{
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fprintf(fout, " %s (.text)\n", seg->includes[j].fpath);
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if (seg->includes[j].linkerPadding != 0)
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fprintf(fout, " . += 0x%X;\n", seg->includes[j].linkerPadding);
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fprintf(fout, " . = ALIGN(0x10);\n");
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}
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fprintf(fout, " _%sSegmentTextEnd = .;\n", seg->name);
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fprintf(fout, " _%sSegmentTextSize = ABSOLUTE( _%sSegmentTextEnd - _%sSegmentTextStart );\n", seg->name, seg->name, seg->name);
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fprintf(fout, " _%sSegmentDataStart = .;\n", seg->name);
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for (j = 0; j < seg->includesCount; j++)
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{
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fprintf(fout, " %s (.data)\n"
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" . = ALIGN(0x10);\n", seg->includes[j].fpath);
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}
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fprintf(fout, " _%sSegmentDataEnd = .;\n", seg->name);
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fprintf(fout, " _%sSegmentDataSize = ABSOLUTE( _%sSegmentDataEnd - _%sSegmentDataStart );\n", seg->name, seg->name, seg->name);
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fprintf(fout, " _%sSegmentRoDataStart = .;\n", seg->name);
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for (j = 0; j < seg->includesCount; j++)
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{
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// Compilers other than IDO, such as GCC, produce different sections such as
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// the ones named directly below. These sections do not contain values that
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// need relocating, but we need to ensure that the base .rodata section
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// always comes first. The reason this is important is due to relocs assuming
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// the base of .rodata being the offset for the relocs and thus needs to remain
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// the beginning of the entire rodata area in order to remain consistent.
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// Inconsistencies will lead to various .rodata reloc crashes as a result of
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// either missing relocs or wrong relocs.
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fprintf(fout, " %s (.rodata)\n"
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" %s (.rodata.str*)\n"
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" %s (.rodata.cst*)\n"
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" . = ALIGN(0x10);\n",
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seg->includes[j].fpath, seg->includes[j].fpath, seg->includes[j].fpath);
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}
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fprintf(fout, " _%sSegmentRoDataEnd = .;\n", seg->name);
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fprintf(fout, " _%sSegmentRoDataSize = ABSOLUTE( _%sSegmentRoDataEnd - _%sSegmentRoDataStart );\n", seg->name, seg->name, seg->name);
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fprintf(fout, " _%sSegmentSDataStart = .;\n", seg->name);
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for (j = 0; j < seg->includesCount; j++)
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fprintf(fout, " %s (.sdata)\n"
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" . = ALIGN(0x10);\n", seg->includes[j].fpath);
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fprintf(fout, " _%sSegmentSDataEnd = .;\n", seg->name);
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fprintf(fout, " _%sSegmentOvlStart = .;\n", seg->name);
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for (j = 0; j < seg->includesCount; j++)
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fprintf(fout, " %s (.ovl)\n", seg->includes[j].fpath);
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fprintf(fout, " _%sSegmentOvlEnd = .;\n", seg->name);
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if (seg->fields & (1 << STMT_increment))
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fprintf(fout, " . += 0x%08X;\n", seg->increment);
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fputs(" }\n", fout);
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fprintf(fout, " _RomSize += ( _%sSegmentOvlEnd - _%sSegmentTextStart );\n", seg->name, seg->name);
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fprintf(fout, " _%sSegmentRomEndTemp = _RomSize;\n"
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"_%sSegmentRomEnd = _%sSegmentRomEndTemp;\n\n",
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seg->name, seg->name, seg->name);
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// align end of ROM segment
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if (seg->fields & (1 << STMT_romalign))
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fprintf(fout, " _RomSize = (_RomSize + %i) & ~ %i;\n", seg->romalign - 1, seg->romalign - 1);
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// uninitialized data (.sbss, .scommon, .bss, COMMON)
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fprintf(fout, " ..%s.bss ADDR(..%s) + SIZEOF(..%s) (NOLOAD) :\n"
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/*" ..%s.bss :\n"*/
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" {\n"
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" . = ALIGN(0x10);\n"
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" _%sSegmentBssStart = .;\n",
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seg->name, seg->name, seg->name, seg->name);
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for (j = 0; j < seg->includesCount; j++)
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fprintf(fout, " %s (.sbss)\n"
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" . = ALIGN(0x10);\n", seg->includes[j].fpath);
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for (j = 0; j < seg->includesCount; j++)
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fprintf(fout, " %s (.scommon)\n"
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" . = ALIGN(0x10);\n", seg->includes[j].fpath);
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for (j = 0; j < seg->includesCount; j++)
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fprintf(fout, " %s (.bss)\n"
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" . = ALIGN(0x10);\n", seg->includes[j].fpath);
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for (j = 0; j < seg->includesCount; j++)
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fprintf(fout, " %s (COMMON)\n"
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" . = ALIGN(0x10);\n", seg->includes[j].fpath);
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fprintf(fout, " . = ALIGN(0x10);\n"
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" _%sSegmentBssEnd = .;\n"
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" _%sSegmentEnd = .;\n"
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" }\n"
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" _%sSegmentBssSize = ABSOLUTE( _%sSegmentBssEnd - _%sSegmentBssStart );\n\n",
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seg->name, seg->name, seg->name, seg->name, seg->name);
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}
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fputs(" _RomEnd = _RomSize;\n\n", fout);
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// Debugging sections
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fputs(
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// mdebug sections
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" .pdr : { *(.pdr) }" "\n"
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" .mdebug : { *(.mdebug) }" "\n"
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" .mdebug.abi32 : { *(.mdebug.abi32) }" "\n"
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// DWARF debug sections
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// Symbols in the DWARF debugging sections are relative to the beginning of the section so we begin them at 0.
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// DWARF 1
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" .debug 0 : { *(.debug) }" "\n"
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" .line 0 : { *(.line) }" "\n"
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// GNU DWARF 1 extensions
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" .debug_srcinfo 0 : { *(.debug_srcinfo) }" "\n"
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" .debug_sfnames 0 : { *(.debug_sfnames) }" "\n"
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// DWARF 1.1 and DWARF 2
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" .debug_aranges 0 : { *(.debug_aranges) }" "\n"
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" .debug_pubnames 0 : { *(.debug_pubnames) }" "\n"
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// DWARF 2
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" .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }" "\n"
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" .debug_abbrev 0 : { *(.debug_abbrev) }" "\n"
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" .debug_line 0 : { *(.debug_line .debug_line.* .debug_line_end ) }" "\n"
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" .debug_frame 0 : { *(.debug_frame) }" "\n"
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" .debug_str 0 : { *(.debug_str) }" "\n"
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" .debug_loc 0 : { *(.debug_loc) }" "\n"
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" .debug_macinfo 0 : { *(.debug_macinfo) }" "\n"
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// SGI/MIPS DWARF 2 extensions
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" .debug_weaknames 0 : { *(.debug_weaknames) }" "\n"
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" .debug_funcnames 0 : { *(.debug_funcnames) }" "\n"
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" .debug_typenames 0 : { *(.debug_typenames) }" "\n"
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" .debug_varnames 0 : { *(.debug_varnames) }" "\n"
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// DWARF 3
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" .debug_pubtypes 0 : { *(.debug_pubtypes) }" "\n"
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" .debug_ranges 0 : { *(.debug_ranges) }" "\n"
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// DWARF 5
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" .debug_addr 0 : { *(.debug_addr) }" "\n"
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" .debug_line_str 0 : { *(.debug_line_str) }" "\n"
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" .debug_loclists 0 : { *(.debug_loclists) }" "\n"
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" .debug_macro 0 : { *(.debug_macro) }" "\n"
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" .debug_names 0 : { *(.debug_names) }" "\n"
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" .debug_rnglists 0 : { *(.debug_rnglists) }" "\n"
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" .debug_str_offsets 0 : { *(.debug_str_offsets) }" "\n"
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" .debug_sup 0 : { *(.debug_sup) }\n"
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// gnu attributes
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" .gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }" "\n", fout);
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// Discard all other sections not mentioned above
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fputs(" /DISCARD/ :" "\n"
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" {" "\n"
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" *(*);" "\n"
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" }" "\n", fout);
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fputs("}\n", fout);
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}
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static void usage(const char *execname)
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{
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fprintf(stderr, "Nintendo 64 linker script generation tool v0.03\n"
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"usage: %s SPEC_FILE LD_SCRIPT\n"
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"SPEC_FILE file describing the organization of object files into segments\n"
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"LD_SCRIPT filename of output linker script\n",
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execname);
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}
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int main(int argc, char **argv)
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{
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FILE *ldout;
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void *spec;
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size_t size;
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if (argc != 3)
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{
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usage(argv[0]);
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return 1;
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}
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spec = util_read_whole_file(argv[1], &size);
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parse_rom_spec(spec, &g_segments, &g_segmentsCount);
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ldout = fopen(argv[2], "w");
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if (ldout == NULL)
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util_fatal_error("failed to open file '%s' for writing", argv[2]);
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write_ld_script(ldout);
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fclose(ldout);
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free_rom_spec(g_segments, g_segmentsCount);
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free(spec);
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return 0;
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}
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