ref: 6a5e2f439e316eff2840ed37df78d6b84e98d1a8
dir: /src/link/output.c/
/*
* This file is part of RGBDS.
*
* Copyright (c) 2019, Eldred Habert and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
#include <assert.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include "link/output.h"
#include "link/main.h"
#include "link/section.h"
#include "link/symbol.h"
#include "extern/err.h"
#include "linkdefs.h"
#include "platform.h" // MIN_NB_ELMS
#define BANK_SIZE 0x4000
FILE *outputFile;
FILE *overlayFile;
FILE *symFile;
FILE *mapFile;
struct SortedSection {
struct Section const *section;
struct SortedSection *next;
};
struct SortedSymbol {
struct Symbol const *sym;
uint32_t idx;
uint16_t addr;
};
static struct {
uint32_t nbBanks;
struct SortedSections {
struct SortedSection *sections;
struct SortedSection *zeroLenSections;
} *banks;
} sections[SECTTYPE_INVALID];
/* Defines the order in which types are output to the sym and map files */
static enum SectionType typeMap[SECTTYPE_INVALID] = {
SECTTYPE_ROM0,
SECTTYPE_ROMX,
SECTTYPE_VRAM,
SECTTYPE_SRAM,
SECTTYPE_WRAM0,
SECTTYPE_WRAMX,
SECTTYPE_OAM,
SECTTYPE_HRAM
};
void out_AddSection(struct Section const *section)
{
static uint32_t maxNbBanks[] = {
[SECTTYPE_ROM0] = 1,
[SECTTYPE_ROMX] = UINT32_MAX,
[SECTTYPE_VRAM] = 2,
[SECTTYPE_SRAM] = UINT32_MAX,
[SECTTYPE_WRAM0] = 1,
[SECTTYPE_WRAMX] = 7,
[SECTTYPE_OAM] = 1,
[SECTTYPE_HRAM] = 1
};
uint32_t targetBank = section->bank - bankranges[section->type][0];
uint32_t minNbBanks = targetBank + 1;
if (minNbBanks > maxNbBanks[section->type])
errx(1, "Section \"%s\" has an invalid bank range (%" PRIu32 " > %" PRIu32 ")",
section->name, section->bank,
maxNbBanks[section->type] - 1);
if (minNbBanks > sections[section->type].nbBanks) {
sections[section->type].banks =
realloc(sections[section->type].banks,
sizeof(*sections[0].banks) * minNbBanks);
for (uint32_t i = sections[section->type].nbBanks; i < minNbBanks; i++) {
sections[section->type].banks[i].sections = NULL;
sections[section->type].banks[i].zeroLenSections = NULL;
}
sections[section->type].nbBanks = minNbBanks;
}
if (!sections[section->type].banks)
err(1, "Failed to realloc banks");
struct SortedSection *newSection = malloc(sizeof(*newSection));
struct SortedSection **ptr = section->size
? §ions[section->type].banks[targetBank].sections
: §ions[section->type].banks[targetBank].zeroLenSections;
if (!newSection)
err(1, "Failed to add new section \"%s\"", section->name);
newSection->section = section;
while (*ptr && (*ptr)->section->org < section->org)
ptr = &(*ptr)->next;
newSection->next = *ptr;
*ptr = newSection;
}
struct Section const *out_OverlappingSection(struct Section const *section)
{
struct SortedSections *banks = sections[section->type].banks;
struct SortedSection *ptr =
banks[section->bank - bankranges[section->type][0]].sections;
while (ptr) {
if (ptr->section->org < section->org + section->size
&& section->org < ptr->section->org + ptr->section->size)
return ptr->section;
ptr = ptr->next;
}
return NULL;
}
/**
* Performs sanity checks on the overlay file.
* @return The number of ROM banks in the overlay file
*/
static uint32_t checkOverlaySize(void)
{
if (!overlayFile)
return 0;
if (fseek(overlayFile, 0, SEEK_END) != 0) {
warnx("Overlay file is not seekable, cannot check if properly formed");
return 0;
}
long overlaySize = ftell(overlayFile);
/* Reset back to beginning */
fseek(overlayFile, 0, SEEK_SET);
if (overlaySize % BANK_SIZE)
errx(1, "Overlay file must have a size multiple of 0x4000");
uint32_t nbOverlayBanks = overlaySize / BANK_SIZE;
if (is32kMode && nbOverlayBanks != 2)
errx(1, "Overlay must be exactly 0x8000 bytes large");
if (nbOverlayBanks < 2)
errx(1, "Overlay must be at least 0x8000 bytes large");
return nbOverlayBanks;
}
/**
* Expand sections[SECTTYPE_ROMX].banks to cover all the overlay banks.
* This ensures that writeROM will output each bank, even if some are not
* covered by any sections.
* @param nbOverlayBanks The number of banks in the overlay file
*/
static void coverOverlayBanks(uint32_t nbOverlayBanks)
{
/* 2 if is32kMode, 1 otherwise */
uint32_t nbRom0Banks = maxsize[SECTTYPE_ROM0] / BANK_SIZE;
/* Discount ROM0 banks to avoid outputting too much */
uint32_t nbUncoveredBanks = nbOverlayBanks - nbRom0Banks > sections[SECTTYPE_ROMX].nbBanks
? nbOverlayBanks - nbRom0Banks
: 0;
if (nbUncoveredBanks > sections[SECTTYPE_ROMX].nbBanks) {
sections[SECTTYPE_ROMX].banks =
realloc(sections[SECTTYPE_ROMX].banks,
sizeof(*sections[SECTTYPE_ROMX].banks) * nbUncoveredBanks);
if (!sections[SECTTYPE_ROMX].banks)
err(1, "Failed to realloc banks for overlay");
for (uint32_t i = sections[SECTTYPE_ROMX].nbBanks; i < nbUncoveredBanks; i++) {
sections[SECTTYPE_ROMX].banks[i].sections = NULL;
sections[SECTTYPE_ROMX].banks[i].zeroLenSections = NULL;
}
sections[SECTTYPE_ROMX].nbBanks = nbUncoveredBanks;
}
}
/**
* Write a ROM bank's sections to the output file.
* @param bankSections The bank's sections, ordered by increasing address
* @param baseOffset The address of the bank's first byte in GB address space
* @param size The size of the bank
*/
static void writeBank(struct SortedSection *bankSections, uint16_t baseOffset,
uint16_t size)
{
uint16_t offset = 0;
while (bankSections) {
struct Section const *section = bankSections->section;
/* Output padding up to the next SECTION */
while (offset + baseOffset < section->org) {
putc(overlayFile ? getc(overlayFile) : padValue,
outputFile);
offset++;
}
/* Output the section itself */
fwrite(section->data, sizeof(*section->data), section->size,
outputFile);
if (overlayFile) {
/* Skip bytes even with pipes */
for (uint16_t i = 0; i < section->size; i++)
getc(overlayFile);
}
offset += section->size;
bankSections = bankSections->next;
}
if (!disablePadding) {
while (offset < size) {
putc(overlayFile ? getc(overlayFile)
: padValue,
outputFile);
offset++;
}
}
}
/**
* Writes a ROM file to the output.
*/
static void writeROM(void)
{
outputFile = openFile(outputFileName, "wb");
overlayFile = openFile(overlayFileName, "rb");
uint32_t nbOverlayBanks = checkOverlaySize();
if (nbOverlayBanks > 0)
coverOverlayBanks(nbOverlayBanks);
if (outputFile) {
if (sections[SECTTYPE_ROM0].nbBanks > 0)
writeBank(sections[SECTTYPE_ROM0].banks[0].sections,
startaddr[SECTTYPE_ROM0], maxsize[SECTTYPE_ROM0]);
for (uint32_t i = 0 ; i < sections[SECTTYPE_ROMX].nbBanks; i++)
writeBank(sections[SECTTYPE_ROMX].banks[i].sections,
startaddr[SECTTYPE_ROMX], maxsize[SECTTYPE_ROMX]);
}
closeFile(outputFile);
closeFile(overlayFile);
}
/**
* Get the lowest section by address out of the two
* @param s1 One choice
* @param s2 The other
* @return The lowest section of the two, or the non-NULL one if applicable
*/
static struct SortedSection const **nextSection(struct SortedSection const **s1,
struct SortedSection const **s2)
{
if (!*s1)
return s2;
if (!*s2)
return s1;
return (*s1)->section->org < (*s2)->section->org ? s1 : s2;
}
/*
* Comparator function for `qsort` to sort symbols
* Symbols are ordered by address, or else by original index for a stable sort
*/
static int compareSymbols(void const *a, void const *b)
{
struct SortedSymbol const *sym1 = (struct SortedSymbol const *)a;
struct SortedSymbol const *sym2 = (struct SortedSymbol const *)b;
if (sym1->addr != sym2->addr)
return sym1->addr < sym2->addr ? -1 : 1;
return sym1->idx < sym2->idx ? -1 : sym1->idx > sym2->idx ? 1 : 0;
}
/**
* Write a bank's contents to the sym file
* @param bankSections The bank's sections
*/
static void writeSymBank(struct SortedSections const *bankSections,
enum SectionType type, uint32_t bank)
{
if (!symFile)
return;
uint32_t nbSymbols = 0;
for (struct SortedSection const *ptr = bankSections->zeroLenSections; ptr; ptr = ptr->next) {
for (struct Section const *sect = ptr->section; sect; sect = sect->nextu)
nbSymbols += sect->nbSymbols;
}
for (struct SortedSection const *ptr = bankSections->sections; ptr; ptr = ptr->next) {
for (struct Section const *sect = ptr->section; sect; sect = sect->nextu)
nbSymbols += sect->nbSymbols;
}
if (!nbSymbols)
return;
struct SortedSymbol *symList = malloc(sizeof(*symList) * nbSymbols);
if (!symList)
err(1, "Failed to allocate symbol list");
uint32_t idx = 0;
for (struct SortedSection const *ptr = bankSections->zeroLenSections; ptr; ptr = ptr->next) {
for (struct Section const *sect = ptr->section; sect; sect = sect->nextu) {
for (uint32_t i = 0; i < sect->nbSymbols; i++) {
symList[idx].idx = idx;
symList[idx].sym = sect->symbols[i];
symList[idx].addr = symList[idx].sym->offset + sect->org;
idx++;
}
}
}
for (struct SortedSection const *ptr = bankSections->sections; ptr; ptr = ptr->next) {
for (struct Section const *sect = ptr->section; sect; sect = sect->nextu) {
for (uint32_t i = 0; i < sect->nbSymbols; i++) {
symList[idx].idx = idx;
symList[idx].sym = sect->symbols[i];
symList[idx].addr = symList[idx].sym->offset + sect->org;
idx++;
}
}
}
assert(idx == nbSymbols);
qsort(symList, nbSymbols, sizeof(*symList), compareSymbols);
uint32_t symBank = bank + bankranges[type][0];
for (uint32_t i = 0; i < nbSymbols; i++) {
struct SortedSymbol *sym = &symList[i];
fprintf(symFile, "%02" PRIx32 ":%04" PRIx16 " %s\n",
symBank, sym->addr, sym->sym->name);
}
free(symList);
}
/**
* Write a bank's contents to the map file
* @param bankSections The bank's sections
* @return The bank's used space
*/
static uint16_t writeMapBank(struct SortedSections const *sectList,
enum SectionType type, uint32_t bank)
{
if (!mapFile)
return 0;
struct SortedSection const *section = sectList->sections;
struct SortedSection const *zeroLenSection = sectList->zeroLenSections;
fprintf(mapFile, "%s bank #%" PRIu32 ":\n", typeNames[type],
bank + bankranges[type][0]);
uint16_t used = 0;
while (section || zeroLenSection) {
struct SortedSection const **pickedSection =
nextSection(§ion, &zeroLenSection);
struct Section const *sect = (*pickedSection)->section;
used += sect->size;
if (sect->size != 0)
fprintf(mapFile, " SECTION: $%04" PRIx16 "-$%04x ($%04" PRIx16
" byte%s) [\"%s\"]\n",
sect->org, sect->org + sect->size - 1,
sect->size, sect->size == 1 ? "" : "s",
sect->name);
else
fprintf(mapFile, " SECTION: $%04" PRIx16 " (0 bytes) [\"%s\"]\n",
sect->org, sect->name);
uint16_t org = sect->org;
while (sect) {
for (size_t i = 0; i < sect->nbSymbols; i++)
fprintf(mapFile, " $%04" PRIx32 " = %s\n",
sect->symbols[i]->offset + org,
sect->symbols[i]->name);
sect = sect->nextu; // Also print symbols in the following "pieces"
}
*pickedSection = (*pickedSection)->next;
}
if (used == 0) {
fputs(" EMPTY\n\n", mapFile);
} else {
uint16_t slack = maxsize[type] - used;
fprintf(mapFile, " SLACK: $%04" PRIx16 " byte%s\n\n", slack,
slack == 1 ? "" : "s");
}
return used;
}
/**
* Write the total used space by section type to the map file
* @param usedMap The total used space by section type
*/
static void writeMapUsed(uint32_t usedMap[MIN_NB_ELMS(SECTTYPE_INVALID)])
{
if (!mapFile)
return;
fputs("USED:\n", mapFile);
for (uint8_t i = 0; i < SECTTYPE_INVALID; i++) {
enum SectionType type = typeMap[i];
// Do not output used space for VRAM or OAM
if (type == SECTTYPE_VRAM || type == SECTTYPE_OAM)
continue;
if (sections[type].nbBanks > 0) {
fprintf(mapFile, " %s: $%04" PRIx32 " byte%s in %" PRIu32 " bank%s\n",
typeNames[type], usedMap[type], usedMap[type] == 1 ? "" : "s",
sections[type].nbBanks, sections[type].nbBanks == 1 ? "" : "s");
}
}
}
/**
* Writes the sym and/or map files, if applicable.
*/
static void writeSymAndMap(void)
{
if (!symFileName && !mapFileName)
return;
uint32_t usedMap[SECTTYPE_INVALID] = {0};
symFile = openFile(symFileName, "w");
mapFile = openFile(mapFileName, "w");
if (symFileName)
fputs("; File generated by rgblink\n", symFile);
for (uint8_t i = 0; i < SECTTYPE_INVALID; i++) {
enum SectionType type = typeMap[i];
for (uint32_t bank = 0; bank < sections[type].nbBanks; bank++) {
struct SortedSections const *sect = §ions[type].banks[bank];
writeSymBank(sect, type, bank);
usedMap[type] += writeMapBank(sect, type, bank);
}
}
writeMapUsed(usedMap);
closeFile(symFile);
closeFile(mapFile);
}
static void cleanupSections(struct SortedSection *section)
{
while (section) {
struct SortedSection *next = section->next;
free(section);
section = next;
}
}
static void cleanup(void)
{
for (enum SectionType type = 0; type < SECTTYPE_INVALID; type++) {
if (sections[type].nbBanks > 0) {
for (uint32_t i = 0; i < sections[type].nbBanks; i++) {
struct SortedSections *bank =
§ions[type].banks[i];
cleanupSections(bank->sections);
cleanupSections(bank->zeroLenSections);
}
free(sections[type].banks);
}
}
}
void out_WriteFiles(void)
{
writeROM();
writeSymAndMap();
cleanup();
}