ref: c20ac350746b318e6399b1bb11d1ad7800263bef
dir: /src/asm/section.c/
#include <errno.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "asm/fstack.h"
#include "asm/main.h"
#include "asm/output.h"
#include "asm/rpn.h"
#include "asm/section.h"
#include "asm/warning.h"
#include "extern/err.h"
#include "platform.h" // strdup
struct SectionStackEntry {
struct Section *section;
char const *scope; /* Section's symbol scope */
uint32_t offset;
struct SectionStackEntry *next;
};
struct SectionStackEntry *sectionStack;
uint32_t curOffset; /* Offset into the current section (see sect_GetSymbolOffset) */
static struct Section *currentLoadSection = NULL;
uint32_t loadOffset; /* The offset of the LOAD section within its parent */
struct UnionStackEntry {
uint32_t start;
uint32_t size;
struct UnionStackEntry *next;
} *unionStack = NULL;
/*
* A quick check to see if we have an initialized section
*/
static inline void checksection(void)
{
if (pCurrentSection == NULL)
fatalerror("Code generation before SECTION directive\n");
}
/*
* A quick check to see if we have an initialized section that can contain
* this much initialized data
*/
static inline void checkcodesection(void)
{
checksection();
if (!sect_HasData(pCurrentSection->type))
fatalerror("Section '%s' cannot contain code or data (not ROM0 or ROMX)\n",
pCurrentSection->name);
}
static inline void checkSectionSize(struct Section const *sect, uint32_t size)
{
uint32_t maxSize = maxsize[sect->type];
if (size > maxSize)
fatalerror("Section '%s' grew too big (max size = 0x%" PRIX32
" bytes, reached 0x%" PRIX32 ").\n", sect->name, maxSize, size);
}
/*
* Check if the section has grown too much.
*/
static inline void reserveSpace(uint32_t delta_size)
{
/*
* This check is here to trap broken code that generates sections that
* are too big and to prevent the assembler from generating huge object
* files or trying to allocate too much memory.
* A check at the linking stage is still necessary.
*/
checkSectionSize(pCurrentSection, curOffset + loadOffset + delta_size);
if (currentLoadSection)
checkSectionSize(currentLoadSection, curOffset + delta_size);
}
struct Section *out_FindSectionByName(const char *name)
{
struct Section *sect = pSectionList;
while (sect) {
if (strcmp(name, sect->name) == 0)
return sect;
sect = sect->next;
}
return NULL;
}
/*
* Find a section by name and type. If it doesn't exist, create it
*/
static struct Section *getSection(char const *name, enum SectionType type,
uint32_t org, struct SectionSpec const *attrs,
enum SectionModifier mod)
{
#define mask(align) ((1 << (align)) - 1)
uint32_t bank = attrs->bank;
uint8_t alignment = attrs->alignment;
uint16_t alignOffset = attrs->alignOfs;
if (bank != -1) {
if (type != SECTTYPE_ROMX && type != SECTTYPE_VRAM
&& type != SECTTYPE_SRAM && type != SECTTYPE_WRAMX)
error("BANK only allowed for ROMX, WRAMX, SRAM, or VRAM sections\n");
else if (bank < bankranges[type][0]
|| bank > bankranges[type][1])
error("%s bank value $%" PRIx32 " out of range ($%" PRIx32 " to $%"
PRIx32 ")\n", typeNames[type], bank,
bankranges[type][0], bankranges[type][1]);
}
if (alignOffset >= 1 << alignment) {
error("Alignment offset must not be greater than alignment (%" PRIu16 " < %u)\n",
alignOffset, 1U << alignment);
alignOffset = 0;
}
if (alignment != 0) {
/* It doesn't make sense to have both alignment and org set */
uint32_t mask = mask(alignment);
if (org != -1) {
if ((org - alignOffset) & mask)
error("Section \"%s\"'s fixed address doesn't match its alignment\n",
name);
alignment = 0; /* Ignore it if it's satisfied */
} else if (startaddr[type] & mask) {
error("Section \"%s\"'s alignment cannot be attained in %s\n",
name, typeNames[type]);
}
}
if (org != -1) {
if (org < startaddr[type] || org > endaddr(type))
error("Section \"%s\"'s fixed address %#" PRIx32
" is outside of range [%#" PRIx16 "; %#" PRIx16 "]\n",
name, org, startaddr[type], endaddr(type));
}
if (nbbanks(type) == 1)
bank = bankranges[type][0];
struct Section *sect = out_FindSectionByName(name);
if (sect) {
unsigned int nbSectErrors = 0;
#define fail(...) \
do { \
error(__VA_ARGS__); \
nbSectErrors++; \
} while (0)
if (type != sect->type)
fail("Section \"%s\" already exists but with type %s\n",
sect->name, typeNames[sect->type]);
if (sect->modifier != mod)
fail("Section \"%s\" already declared as %s section\n",
sect->name, sectionModNames[sect->modifier]);
/*
* Normal sections need to have exactly identical constraints;
* but unionized sections only need "compatible" constraints,
* and they end up with the strictest combination of both
*/
if (mod == SECTION_UNION) {
/*
* WARNING: see comment about assumption in
* `EndLoadSection` if modifying the following check!
*/
if (sect_HasData(type))
fail("Cannot declare ROM sections as UNION\n");
if (org != -1) {
/* If both are fixed, they must be the same */
if (sect->org != -1 && sect->org != org)
fail("Section \"%s\" already declared as fixed at different address $%"
PRIx32 "\n",
sect->name, sect->org);
else if (sect->align != 0
&& (mask(sect->align)
& (org - sect->alignOfs)))
fail("Section \"%s\" already declared as aligned to %u bytes (offset %"
PRIu16 ")\n", sect->name, 1U << sect->align, sect->alignOfs);
else
/* Otherwise, just override */
sect->org = org;
} else if (alignment != 0) {
/* Make sure any fixed address is compatible */
if (sect->org != -1) {
if ((sect->org - alignOffset)
& mask(alignment))
fail("Section \"%s\" already declared as fixed at incompatible address $%"
PRIx32 "\n", sect->name, sect->org);
/* Check if alignment offsets are compatible */
} else if ((alignOffset & mask(sect->align))
!= (sect->alignOfs
& mask(alignment))) {
fail("Section \"%s\" already declared with incompatible %"
PRIu8 "-byte alignment (offset %" PRIu16 ")\n",
sect->name, sect->align, sect->alignOfs);
} else if (alignment > sect->align) {
/*
* If the section is not fixed,
* its alignment is the largest of both
*/
sect->align = alignment;
sect->alignOfs = alignOffset;
}
}
/* If the section's bank is unspecified, override it */
if (sect->bank == -1)
sect->bank = bank;
/* If both specify a bank, it must be the same one */
else if (bank != -1 && sect->bank != bank)
fail("Section \"%s\" already declared with different bank %"
PRIu32 "\n", sect->name, sect->bank);
} else { /* Section fragments are handled identically in RGBASM */
/* However, concaternating non-fragments will be made an error */
if (sect->modifier != SECTION_FRAGMENT || mod != SECTION_FRAGMENT)
warning(WARNING_OBSOLETE,
"Concatenation of non-fragment sections is deprecated\n");
if (org != sect->org) {
if (sect->org == -1)
fail("Section \"%s\" already declared as floating\n",
sect->name);
else
fail("Section \"%s\" already declared as fixed at $%"
PRIx32 "\n", sect->name, sect->org);
}
if (bank != sect->bank) {
if (sect->bank == -1)
fail("Section \"%s\" already declared as floating bank\n",
sect->name);
else
fail("Section \"%s\" already declared as fixed at bank %"
PRIu32 "\n", sect->name, sect->bank);
}
if (alignment != sect->align) {
if (sect->align == 0)
fail("Section \"%s\" already declared as unaligned\n",
sect->name);
else
fail("Section \"%s\" already declared as aligned to %u bytes\n",
sect->name, 1U << sect->align);
}
}
if (nbSectErrors)
fatalerror("Cannot create section \"%s\" (%u errors)\n",
sect->name, nbSectErrors);
#undef fail
return sect;
}
sect = malloc(sizeof(*sect));
if (sect == NULL)
fatalerror("Not enough memory for section: %s\n", strerror(errno));
sect->name = strdup(name);
if (sect->name == NULL)
fatalerror("Not enough memory for section name: %s\n", strerror(errno));
sect->type = type;
sect->modifier = mod;
sect->size = 0;
sect->org = org;
sect->bank = bank;
sect->align = alignment;
sect->alignOfs = alignOffset;
sect->next = pSectionList;
sect->patches = NULL;
/* It is only needed to allocate memory for ROM sections. */
if (sect_HasData(type)) {
uint32_t sectsize;
sectsize = maxsize[type];
sect->data = malloc(sectsize);
if (sect->data == NULL)
fatalerror("Not enough memory for section: %s\n", strerror(errno));
} else {
sect->data = NULL;
}
/*
* Add the new section to the list
* at the beginning because order doesn't matter
*/
pSectionList = sect;
return sect;
#undef mask
}
/*
* Set the current section
*/
static void changeSection(void)
{
if (unionStack)
fatalerror("Cannot change the section within a UNION\n");
sym_SetCurrentSymbolScope(NULL);
}
/*
* Set the current section by name and type
*/
void out_NewSection(char const *name, uint32_t type, uint32_t org,
struct SectionSpec const *attribs, enum SectionModifier mod)
{
if (currentLoadSection)
fatalerror("Cannot change the section within a `LOAD` block\n");
struct Section *sect = getSection(name, type, org, attribs, mod);
changeSection();
curOffset = mod == SECTION_UNION ? 0 : sect->size;
pCurrentSection = sect;
}
/*
* Set the current section by name and type
*/
void out_SetLoadSection(char const *name, uint32_t type, uint32_t org,
struct SectionSpec const *attribs)
{
checkcodesection();
if (currentLoadSection)
fatalerror("`LOAD` blocks cannot be nested\n");
if (sect_HasData(type))
error("`LOAD` blocks cannot create a ROM section\n");
struct Section *sect = getSection(name, type, org, attribs, false);
loadOffset = curOffset;
curOffset = 0; /* curOffset -= loadOffset; */
changeSection();
currentLoadSection = sect;
}
void out_EndLoadSection(void)
{
if (!currentLoadSection)
error("Found `ENDL` outside of a `LOAD` block\n");
currentLoadSection = NULL;
changeSection();
curOffset += loadOffset;
loadOffset = 0;
}
struct Section *sect_GetSymbolSection(void)
{
return currentLoadSection ? currentLoadSection : pCurrentSection;
}
/*
* The offset into the section above
*/
uint32_t sect_GetSymbolOffset(void)
{
return curOffset;
}
uint32_t sect_GetOutputOffset(void)
{
return curOffset + loadOffset;
}
void sect_AlignPC(uint8_t alignment, uint16_t offset)
{
checksection();
struct Section *sect = sect_GetSymbolSection();
if (sect->org != -1) {
if ((sym_GetPCValue() - offset) % (1 << alignment))
error("Section's fixed address fails required alignment (PC = $%04"
PRIx32 ")\n", sym_GetPCValue());
} else if (sect->align != 0) {
if ((((sect->alignOfs + curOffset) % (1 << sect->align))
- offset) % (1 << alignment)) {
error("Section's alignment fails required alignment (offset from section start = $%04"
PRIx32 ")\n", curOffset);
} else if (alignment > sect->align) {
sect->align = alignment;
sect->alignOfs =
(offset - curOffset) % (1 << alignment);
}
} else {
sect->align = alignment;
sect->alignOfs = offset;
}
}
static inline void growSection(uint32_t growth)
{
curOffset += growth;
if (curOffset + loadOffset > pCurrentSection->size)
pCurrentSection->size = curOffset + loadOffset;
if (currentLoadSection && curOffset > currentLoadSection->size)
currentLoadSection->size = curOffset;
}
static inline void writebyte(uint8_t byte)
{
pCurrentSection->data[sect_GetOutputOffset()] = byte;
growSection(1);
}
static inline void writeword(uint16_t b)
{
writebyte(b & 0xFF);
writebyte(b >> 8);
}
static inline void writelong(uint32_t b)
{
writebyte(b & 0xFF);
writebyte(b >> 8);
writebyte(b >> 16);
writebyte(b >> 24);
}
static inline void createPatch(enum PatchType type,
struct Expression const *expr)
{
out_CreatePatch(type, expr, sect_GetOutputOffset());
}
void sect_StartUnion(void)
{
if (!pCurrentSection)
fatalerror("UNIONs must be inside a SECTION\n");
if (sect_HasData(pCurrentSection->type))
fatalerror("Cannot use UNION inside of ROM0 or ROMX sections\n");
struct UnionStackEntry *entry = malloc(sizeof(*entry));
if (!entry)
fatalerror("Failed to allocate new union stack entry: %s\n", strerror(errno));
entry->start = curOffset;
entry->size = 0;
entry->next = unionStack;
unionStack = entry;
}
static void endUnionMember(void)
{
uint32_t memberSize = curOffset - unionStack->start;
if (memberSize > unionStack->size)
unionStack->size = memberSize;
curOffset = unionStack->start;
}
void sect_NextUnionMember(void)
{
if (!unionStack)
fatalerror("Found NEXTU outside of a UNION construct\n");
endUnionMember();
}
void sect_EndUnion(void)
{
if (!unionStack)
fatalerror("Found ENDU outside of a UNION construct\n");
endUnionMember();
curOffset += unionStack->size;
struct UnionStackEntry *next = unionStack->next;
free(unionStack);
unionStack = next;
}
void sect_CheckUnionClosed(void)
{
if (unionStack)
fatalerror("Unterminated UNION construct!\n");
}
/*
* Output an absolute byte
*/
void out_AbsByte(uint8_t b)
{
checkcodesection();
reserveSpace(1);
writebyte(b);
}
void out_AbsByteGroup(uint8_t const *s, int32_t length)
{
checkcodesection();
reserveSpace(length);
while (length--)
writebyte(*s++);
}
void out_AbsWordGroup(uint8_t const *s, int32_t length)
{
checkcodesection();
reserveSpace(length * 2);
while (length--)
writeword(*s++);
}
void out_AbsLongGroup(uint8_t const *s, int32_t length)
{
checkcodesection();
reserveSpace(length * 4);
while (length--)
writelong(*s++);
}
/*
* Skip this many bytes
*/
void out_Skip(int32_t skip, bool ds)
{
checksection();
reserveSpace(skip);
if (!ds && sect_HasData(pCurrentSection->type))
warning(WARNING_EMPTY_DATA_DIRECTIVE, "db/dw/dl directive without data in ROM\n");
if (!sect_HasData(pCurrentSection->type)) {
growSection(skip);
} else {
checkcodesection();
while (skip--)
writebyte(CurrentOptions.fillchar);
}
}
/*
* Output a NULL terminated string (excluding the NULL-character)
*/
void out_String(char const *s)
{
checkcodesection();
reserveSpace(strlen(s));
while (*s)
writebyte(*s++);
}
/*
* Output a relocatable byte. Checking will be done to see if it
* is an absolute value in disguise.
*/
void out_RelByte(struct Expression *expr)
{
checkcodesection();
reserveSpace(1);
if (!rpn_isKnown(expr)) {
createPatch(PATCHTYPE_BYTE, expr);
writebyte(0);
} else {
writebyte(expr->nVal);
}
rpn_Free(expr);
}
/*
* Output several copies of a relocatable byte. Checking will be done to see if
* it is an absolute value in disguise.
*/
void out_RelBytes(struct Expression *expr, uint32_t n)
{
checkcodesection();
reserveSpace(n);
while (n--) {
if (!rpn_isKnown(expr)) {
createPatch(PATCHTYPE_BYTE, expr);
writebyte(0);
} else {
writebyte(expr->nVal);
}
}
rpn_Free(expr);
}
/*
* Output a relocatable word. Checking will be done to see if
* it's an absolute value in disguise.
*/
void out_RelWord(struct Expression *expr)
{
checkcodesection();
reserveSpace(2);
if (!rpn_isKnown(expr)) {
createPatch(PATCHTYPE_WORD, expr);
writeword(0);
} else {
writeword(expr->nVal);
}
rpn_Free(expr);
}
/*
* Output a relocatable longword. Checking will be done to see if
* is an absolute value in disguise.
*/
void out_RelLong(struct Expression *expr)
{
checkcodesection();
reserveSpace(2);
if (!rpn_isKnown(expr)) {
createPatch(PATCHTYPE_LONG, expr);
writelong(0);
} else {
writelong(expr->nVal);
}
rpn_Free(expr);
}
/*
* Output a PC-relative relocatable byte. Checking will be done to see if it
* is an absolute value in disguise.
*/
void out_PCRelByte(struct Expression *expr)
{
checkcodesection();
reserveSpace(1);
struct Symbol const *pc = sym_GetPC();
if (!rpn_IsDiffConstant(expr, pc)) {
createPatch(PATCHTYPE_JR, expr);
writebyte(0);
} else {
struct Symbol const *sym = rpn_SymbolOf(expr);
/* The offset wraps (jump from ROM to HRAM, for example) */
int16_t offset;
/* Offset is relative to the byte *after* the operand */
if (sym == pc)
offset = -2; /* PC as operand to `jr` is lower than reference PC by 2 */
else
offset = sym_GetValue(sym) - (sym_GetValue(pc) + 1);
if (offset < -128 || offset > 127) {
error("jr target out of reach (expected -129 < %" PRId16 " < 128)\n",
offset);
writebyte(0);
} else {
writebyte(offset);
}
}
rpn_Free(expr);
}
/*
* Output a binary file
*/
void out_BinaryFile(char const *s, int32_t startPos)
{
if (startPos < 0) {
error("Start position cannot be negative (%" PRId32 ")\n", startPos);
startPos = 0;
}
char *fullPath = NULL;
size_t size = 0;
FILE *f = NULL;
if (fstk_FindFile(s, &fullPath, &size))
f = fopen(fullPath, "rb");
free(fullPath);
if (!f) {
if (oGeneratedMissingIncludes) {
oFailedOnMissingInclude = true;
return;
}
fatalerror("Error opening INCBIN file '%s': %s\n", s, strerror(errno));
}
int32_t fsize = -1;
int byte;
checkcodesection();
if (fseek(f, 0, SEEK_END) != -1) {
fsize = ftell(f);
if (startPos >= fsize) {
error("Specified start position is greater than length of file\n");
fclose(f);
return;
}
fseek(f, startPos, SEEK_SET);
reserveSpace(fsize - startPos);
} else {
if (errno != ESPIPE)
error("Error determining size of INCBIN file '%s': %s\n",
s, strerror(errno));
/* The file isn't seekable, so we'll just skip bytes */
while (startPos--)
(void)fgetc(f);
}
while ((byte = fgetc(f)) != EOF) {
if (fsize == -1)
growSection(1);
writebyte(byte);
}
if (ferror(f))
error("Error reading INCBIN file '%s': %s\n", s, strerror(errno));
fclose(f);
}
void out_BinaryFileSlice(char const *s, int32_t start_pos, int32_t length)
{
if (start_pos < 0) {
error("Start position cannot be negative (%" PRId32 ")\n", start_pos);
start_pos = 0;
}
if (length < 0) {
error("Number of bytes to read cannot be negative (%" PRId32 ")\n", length);
length = 0;
}
if (length == 0) /* Don't even bother with 0-byte slices */
return;
char *fullPath = NULL;
size_t size = 0;
FILE *f = NULL;
if (fstk_FindFile(s, &fullPath, &size))
f = fopen(fullPath, "rb");
if (!f) {
free(fullPath);
if (oGeneratedMissingIncludes) {
oFailedOnMissingInclude = true;
return;
}
fatalerror("Error opening INCBIN file '%s': %s\n", s, strerror(errno));
}
checkcodesection();
reserveSpace(length);
int32_t fsize;
if (fseek(f, 0, SEEK_END) != -1) {
fsize = ftell(f);
if (start_pos >= fsize) {
error("Specified start position is greater than length of file\n");
return;
}
if ((start_pos + length) > fsize)
fatalerror("Specified range in INCBIN is out of bounds\n");
fseek(f, start_pos, SEEK_SET);
} else {
if (errno != ESPIPE)
error("Error determining size of INCBIN file '%s': %s\n",
s, strerror(errno));
/* The file isn't seekable, so we'll just skip bytes */
while (start_pos--)
(void)fgetc(f);
}
int32_t todo = length;
while (todo--) {
int byte = fgetc(f);
if (byte != EOF) {
writebyte(byte);
} else if (ferror(f)) {
error("Error reading INCBIN file '%s': %s\n", s, strerror(errno));
} else {
error("Premature end of file (%" PRId32 " bytes left to read)\n",
todo + 1);
}
}
fclose(f);
free(fullPath);
}
/*
* Section stack routines
*/
void out_PushSection(void)
{
struct SectionStackEntry *sect = malloc(sizeof(*sect));
if (sect == NULL)
fatalerror("No memory for section stack: %s\n", strerror(errno));
sect->section = pCurrentSection;
sect->scope = sym_GetCurrentSymbolScope();
sect->offset = curOffset;
sect->next = sectionStack;
sectionStack = sect;
/* TODO: maybe set current section to NULL? */
}
void out_PopSection(void)
{
if (!sectionStack)
fatalerror("No entries in the section stack\n");
if (currentLoadSection)
fatalerror("Cannot change the section within a `LOAD` block!\n");
struct SectionStackEntry *sect;
sect = sectionStack;
changeSection();
pCurrentSection = sect->section;
sym_SetCurrentSymbolScope(sect->scope);
curOffset = sect->offset;
sectionStack = sect->next;
free(sect);
}