ref: fa767f32285abf9d7c840514e64ff99adaaab178
dir: /src/link/script.c/
/*
* Copyright (C) 2017 Antonio Nino Diaz <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <string.h>
#include "extern/err.h"
#include "link/assign.h"
#include "link/mylink.h"
static struct {
unsigned int address; /* current address to write sections to */
unsigned int top_address; /* not inclusive */
enum eSectionType type;
} bank[MAXBANKS];
static int current_bank = -1; /* Bank as seen by the bank array */
static int current_real_bank = -1; /* bank as seen by the GB */
void script_InitSections(void)
{
int i;
for (i = 0; i < MAXBANKS; i++) {
if (i == BANK_ROM0) {
/* ROM0 bank */
bank[i].address = 0x0000;
if (options & OPT_TINY) {
bank[i].top_address = 0x8000;
} else {
bank[i].top_address = 0x4000;
}
bank[i].type = SECT_ROM0;
} else if (i >= BANK_ROMX && i < BANK_ROMX + BANK_COUNT_ROMX) {
/* Swappable ROM bank */
bank[i].address = 0x4000;
bank[i].top_address = 0x8000;
bank[i].type = SECT_ROMX;
} else if (i == BANK_WRAM0) {
/* WRAM */
bank[i].address = 0xC000;
if (options & OPT_DMG_MODE) {
bank[i].top_address = 0xE000;
} else {
bank[i].top_address = 0xD000;
}
bank[i].type = SECT_WRAM0;
} else if (i >= BANK_SRAM && i < BANK_SRAM + BANK_COUNT_SRAM) {
/* Swappable SRAM bank */
bank[i].address = 0xA000;
bank[i].top_address = 0xC000;
bank[i].type = SECT_SRAM;
} else if (i >= BANK_WRAMX && i < BANK_WRAMX + BANK_COUNT_WRAMX) {
/* Swappable WRAM bank */
bank[i].address = 0xD000;
bank[i].top_address = 0xE000;
bank[i].type = SECT_WRAMX;
} else if (i >= BANK_VRAM && i < BANK_VRAM + BANK_COUNT_VRAM) {
/* Swappable VRAM bank */
bank[i].address = 0x8000;
bank[i].type = SECT_VRAM;
if (options & OPT_DMG_MODE && i != BANK_VRAM) {
/* In DMG the only available bank is bank 0. */
bank[i].top_address = 0x8000;
} else {
bank[i].top_address = 0xA000;
}
} else if (i == BANK_OAM) {
/* OAM */
bank[i].address = 0xFE00;
bank[i].top_address = 0xFEA0;
bank[i].type = SECT_OAM;
} else if (i == BANK_HRAM) {
/* HRAM */
bank[i].address = 0xFF80;
bank[i].top_address = 0xFFFF;
bank[i].type = SECT_HRAM;
} else {
errx(1, "(INTERNAL) Unknown bank type!");
}
}
}
void script_SetCurrentSectionType(const char *type, unsigned int bank)
{
if (strcmp(type, "ROM0") == 0) {
if (bank != 0)
errx(1, "(Internal) Trying to assign a bank number to ROM0.\n");
current_bank = BANK_ROM0;
current_real_bank = 0;
return;
} else if (strcmp(type, "ROMX") == 0) {
if (bank == 0)
errx(1, "ROMX index can't be 0.\n");
if (bank > BANK_COUNT_ROMX)
errx(1, "ROMX index too big (%d > %d).\n", bank, BANK_COUNT_ROMX);
current_bank = BANK_ROMX + bank - 1;
current_real_bank = bank;
return;
} else if (strcmp(type, "VRAM") == 0) {
if (bank >= BANK_COUNT_VRAM)
errx(1, "VRAM index too big (%d >= %d).\n", bank, BANK_COUNT_VRAM);
current_bank = BANK_VRAM + bank;
current_real_bank = bank;
return;
} else if (strcmp(type, "WRAM0") == 0) {
if (bank != 0)
errx(1, "(Internal) Trying to assign a bank number to WRAM0.\n");
current_bank = BANK_WRAM0;
current_real_bank = 0;
return;
} else if (strcmp(type, "WRAMX") == 0) {
if (bank == 0)
errx(1, "WRAMX index can't be 0.\n");
if (bank > BANK_COUNT_WRAMX)
errx(1, "WRAMX index too big (%d > %d).\n", bank, BANK_COUNT_WRAMX);
current_bank = BANK_WRAMX + bank - 1;
current_real_bank = bank - 1;
return;
} else if (strcmp(type, "SRAM") == 0) {
if (bank >= BANK_COUNT_SRAM)
errx(1, "SRAM index too big (%d >= %d).\n", bank, BANK_COUNT_SRAM);
current_bank = BANK_SRAM + bank;
current_real_bank = bank;
return;
} else if (strcmp(type, "OAM") == 0) {
if (bank != 0)
errx(1, "(Internal) Trying to assign a bank number to OAM.\n");
current_bank = BANK_OAM;
current_real_bank = 0;
return;
} else if (strcmp(type, "HRAM") == 0) {
if (bank != 0)
errx(1, "(Internal) Trying to assign a bank number to HRAM.\n");
current_bank = BANK_HRAM;
current_real_bank = 0;
return;
}
errx(1, "(Internal) Unknown section type \"%s\".\n", type);
}
void script_SetAddress(unsigned int addr)
{
if (current_bank == -1) {
errx(1, "Trying to set an address without assigned bank\n");
}
/* Make sure that we don't go back. */
if (bank[current_bank].address > addr) {
errx(1, "Trying to go to a previous address (0x%04X to 0x%04X)\n",
bank[current_bank].address, addr);
}
bank[current_bank].address = addr;
/* Make sure we don't overflow */
if (bank[current_bank].address >= bank[current_bank].top_address) {
errx(1, "Bank overflowed (0x%04X >= 0x%04X)\n",
bank[current_bank].address, bank[current_bank].top_address);
}
}
void script_SetAlignment(unsigned int alignment)
{
if (current_bank == -1) {
errx(1, "Trying to set an alignment without assigned bank\n");
}
if (alignment > 15) {
errx(1, "Trying to set an alignment too big: %d\n", alignment);
}
unsigned int size = 1 << alignment;
unsigned int mask = size - 1;
if (bank[current_bank].address & mask) {
bank[current_bank].address &= ~mask;
bank[current_bank].address += size;
}
/* Make sure we don't overflow */
if (bank[current_bank].address >= bank[current_bank].top_address) {
errx(1, "Bank overflowed (0x%04X >= 0x%04X)\n",
bank[current_bank].address, bank[current_bank].top_address);
}
}
void script_OutputSection(const char *section_name)
{
if (current_bank == -1) {
errx(1, "Trying to place section \"%s\" without assigned bank\n", section_name);
}
if (!IsSectionSameTypeBankAndFloating(section_name, bank[current_bank].type,
current_real_bank)) {
errx(1, "Different attributes for \"%s\" in source and linkerscript\n",
section_name);
}
/* Move section to its place. */
bank[current_bank].address +=
AssignSectionAddressAndBankByName(section_name,
bank[current_bank].address, current_real_bank);
}