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