ref: f9f27d6f5a00898f7d3faaee921ab8d13e13b85a
dir: /src/asm/section.c/
#include <errno.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" struct SectionStackEntry { struct Section *pSection; struct Symbol *pScope; /* Section's symbol scope */ uint32_t offset; struct SectionStackEntry *pNext; }; struct SectionStackEntry *pSectionStack; static struct Section *currentLoadSection = NULL; uint32_t loadOffset = 0; /* The offset of the LOAD section within its parent */ /* * 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"); } /* * 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->nType)) fatalerror("Section '%s' cannot contain code or data (not ROM0 or ROMX)", pCurrentSection->pzName); else if (nUnionDepth > 0) fatalerror("UNIONs cannot contain code or data"); } /* * Check if the section has grown too much. */ static void reserveSpace(uint32_t delta_size) { uint32_t maxSize = maxsize[pCurrentSection->nType]; uint32_t newSize = curOffset + 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. */ if (newSize > maxSize) fatalerror("Section '%s' is too big (max size = 0x%X bytes, reached 0x%X).", pCurrentSection->pzName, maxSize, newSize); } struct Section *out_FindSectionByName(const char *pzName) { struct Section *pSect = pSectionList; while (pSect) { if (strcmp(pzName, pSect->pzName) == 0) return pSect; pSect = pSect->pNext; } return NULL; } /* * Find a section by name and type. If it doesn't exist, create it */ static struct Section *getSection(char const *pzName, enum SectionType type, uint32_t org, struct SectionSpec const *attrs, bool isUnion) { #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) yyerror("BANK only allowed for ROMX, WRAMX, SRAM, or VRAM sections"); else if (bank < bankranges[type][0] || bank > bankranges[type][1]) yyerror("%s bank value $%x out of range ($%x to $%x)", typeNames[type], bank, bankranges[type][0], bankranges[type][1]); } if (alignOffset >= 1 << alignment) { yyerror("Alignment offset must not be greater than alignment (%u < %u)", alignOffset, 1 << 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) yyerror("Section \"%s\"'s fixed address doesn't match its alignment", pzName); alignment = 0; /* Ignore it if it's satisfied */ } else if (startaddr[type] & mask) { yyerror("Section \"%s\"'s alignment cannot be attained in %s", pzName, typeNames[type]); } } if (org != -1) { if (org < startaddr[type] || org > endaddr(type)) yyerror("Section \"%s\"'s fixed address %#x is outside of range [%#x; %#x]", pzName, org, startaddr[type], endaddr(type)); } if (nbbanks(type) == 1) bank = bankranges[type][0]; struct Section *pSect = out_FindSectionByName(pzName); if (pSect) { unsigned int nbSectErrors = 0; #define fail(...) \ do { \ yyerror(__VA_ARGS__); \ nbSectErrors++; \ } while (0) if (type != pSect->nType) fail("Section \"%s\" already exists but with type %s", pSect->pzName, typeNames[pSect->nType]); /* * 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 (isUnion) { if (!pSect->isUnion) fail("Section \"%s\" already declared as non-union", pSect->pzName); /* * WARNING: see comment abount assumption in * `EndLoadSection` if modifying the following check! */ if (sect_HasData(type)) fail("Cannot declare ROM sections as UNION"); if (org != -1) { /* If both are fixed, they must be the same */ if (pSect->nOrg != -1 && pSect->nOrg != org) fail("Section \"%s\" already declared as fixed at different address $%x", pSect->pzName, pSect->nOrg); else if (pSect->nAlign != 0 && (mask(pSect->nAlign) & (org - pSect->alignOfs))) fail("Section \"%s\" already declared as aligned to %u bytes (offset %u)", pSect->pzName, 1 << pSect->nAlign, pSect->alignOfs); else /* Otherwise, just override */ pSect->nOrg = org; } else if (alignment != 0) { /* Make sure any fixed address is compatible */ if (pSect->nOrg != -1) { if ((pSect->nOrg - alignOffset) & mask(alignment)) fail("Section \"%s\" already declared as fixed at incompatible address $%x", pSect->pzName, pSect->nOrg); /* Check if alignment offsets are compatible */ } else if ((alignOffset & mask(pSect->nAlign)) != (pSect->alignOfs & mask(alignment))) { fail("Section \"%s\" already declared with incompatible %u-byte alignment (offset %u)", pSect->pzName, pSect->nAlign, pSect->alignOfs); } else if (alignment > pSect->nAlign) { /* * If the section is not fixed, * its alignment is the largest of both */ pSect->nAlign = alignment; pSect->alignOfs = alignOffset; } } /* If the section's bank is unspecified, override it */ if (pSect->nBank == -1) pSect->nBank = bank; /* If both specify a bank, it must be the same one */ else if (bank != -1 && pSect->nBank != bank) fail("Section \"%s\" already declared with different bank %u", pSect->pzName, pSect->nBank); } else { if (pSect->isUnion) fail("Section \"%s\" already declared as union", pSect->pzName); if (org != pSect->nOrg) { if (pSect->nOrg == -1) fail("Section \"%s\" already declared as floating", pSect->pzName); else fail("Section \"%s\" already declared as fixed at $%x", pSect->pzName, pSect->nOrg); } if (bank != pSect->nBank) { if (pSect->nBank == -1) fail("Section \"%s\" already declared as floating bank", pSect->pzName); else fail("Section \"%s\" already declared as fixed at bank %u", pSect->pzName, pSect->nBank); } if (alignment != pSect->nAlign) { if (pSect->nAlign == 0) fail("Section \"%s\" already declared as unaligned", pSect->pzName); else fail("Section \"%s\" already declared as aligned to %u bytes", pSect->pzName, 1 << pSect->nAlign); } } if (nbSectErrors) fatalerror("Cannot create section \"%s\" (%u errors)", pSect->pzName, nbSectErrors); #undef fail return pSect; } pSect = malloc(sizeof(*pSect)); if (pSect == NULL) fatalerror("Not enough memory for section"); pSect->pzName = strdup(pzName); if (pSect->pzName == NULL) fatalerror("Not enough memory for sectionname"); pSect->nType = type; pSect->isUnion = isUnion; pSect->size = 0; pSect->nOrg = org; pSect->nBank = bank; pSect->nAlign = alignment; pSect->alignOfs = alignOffset; pSect->pNext = pSectionList; pSect->pPatches = NULL; /* It is only needed to allocate memory for ROM sections. */ if (sect_HasData(type)) { uint32_t sectsize; sectsize = maxsize[type]; pSect->tData = malloc(sectsize); if (pSect->tData == NULL) fatalerror("Not enough memory for section"); } else { pSect->tData = NULL; } /* * Add the new section to the list * at the beginning because order doesn't matter */ pSectionList = pSect; return pSect; #undef mask } /* * Set the current section */ static void changeSection(void) { if (nUnionDepth > 0) fatalerror("Cannot change the section within a UNION"); sym_SetCurrentSymbolScope(NULL); } /* * Set the current section by name and type */ void out_NewSection(char const *pzName, uint32_t type, uint32_t org, struct SectionSpec const *attribs, bool isUnion) { if (currentLoadSection) fatalerror("Cannot change the section within a `LOAD` block"); struct Section *pSect = getSection(pzName, type, org, attribs, isUnion); changeSection(); curOffset = isUnion ? 0 : pSect->size; pCurrentSection = pSect; } /* * 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"); struct Section *pSect = getSection(name, type, org, attribs, false); loadOffset = curOffset; curOffset = 0; /* curOffset -= loadOffset; */ changeSection(); currentLoadSection = pSect; } void out_EndLoadSection(void) { if (!currentLoadSection) yyerror("Found `ENDL` outside of a `LOAD` block"); currentLoadSection = NULL; changeSection(); curOffset += loadOffset; loadOffset = 0; } struct Section *sect_GetSymbolSection(void) { return currentLoadSection ? currentLoadSection : pCurrentSection; } uint32_t sect_GetOutputOffset(void) { return curOffset + loadOffset; } void sect_AlignPC(uint8_t alignment, uint16_t offset) { struct Section *sect = sect_GetSymbolSection(); if (sect->nOrg != -1) { if ((sym_GetPCValue() - offset) % (1 << alignment)) yyerror("Section's fixed address fails required alignment (PC = $%04x)", sym_GetPCValue()); } else if (sect->nAlign != 0) { if ((((sect->alignOfs + curOffset) % (1 << sect->nAlign)) - offset) % (1 << alignment)) { yyerror("Section's alignment fails required alignment (offset from section start = $%04x)", curOffset); } else if (alignment > sect->nAlign) { sect->nAlign = alignment; sect->alignOfs = (offset - curOffset) % (1 << alignment); } } else { sect->nAlign = alignment; sect->alignOfs = offset; } } static inline void growSection(uint32_t growth) { curOffset += growth; if (curOffset > pCurrentSection->size) pCurrentSection->size = curOffset; if (currentLoadSection && curOffset > currentLoadSection->size) currentLoadSection->size = curOffset; } static inline void writebyte(uint8_t byte) { pCurrentSection->tData[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()); } /* * 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++); } /* * Skip this many bytes */ void out_Skip(int32_t skip) { checksection(); reserveSpace(skip); if (!sect_HasData(pCurrentSection->nType)) { growSection(skip); } else if (nUnionDepth > 0) { while (skip--) writebyte(CurrentOptions.fillchar); } 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); if (!rpn_isKnown(expr) || pCurrentSection->nOrg == -1) { createPatch(PATCHTYPE_JR, expr); writebyte(0); } else { /* Target is relative to the byte *after* the operand */ uint16_t address = sym_GetPCValue() + 1; /* The offset wraps (jump from ROM to HRAM, for loopexample) */ int16_t offset = expr->nVal - address; if (offset < -128 || offset > 127) { yyerror("jr target out of reach (expected -129 < %d < 128)", offset); writebyte(0); } else { writebyte(offset); } } rpn_Free(expr); } /* * Output a binary file */ void out_BinaryFile(char const *s) { FILE *f = fstk_FindFile(s, NULL); if (!f) { if (oGeneratedMissingIncludes) { oFailedOnMissingInclude = true; return; } fatalerror("Error opening INCBIN file '%s': %s", s, strerror(errno)); } int32_t fsize = -1; int byte; checkcodesection(); if (fseek(f, 0, SEEK_END) != -1) { fsize = ftell(f); rewind(f); reserveSpace(fsize); } else if (errno != ESPIPE) { yyerror("Error determining size of INCBIN file '%s': %s", s, strerror(errno)); } while ((byte = fgetc(f)) != EOF) { if (fsize == -1) growSection(1); writebyte(byte); } if (ferror(f)) yyerror("Error reading INCBIN file '%s': %s", s, strerror(errno)); fclose(f); } void out_BinaryFileSlice(char const *s, int32_t start_pos, int32_t length) { if (start_pos < 0) { yyerror("Start position cannot be negative (%d)", start_pos); start_pos = 0; } if (length < 0) { yyerror("Number of bytes to read cannot be negative (%d)", length); length = 0; } if (length == 0) /* Don't even bother with 0-byte slices */ return; FILE *f = fstk_FindFile(s, NULL); if (!f) { if (oGeneratedMissingIncludes) { oFailedOnMissingInclude = true; return; } fatalerror("Error opening INCBIN file '%s': %s", s, strerror(errno)); } checkcodesection(); reserveSpace(length); int32_t fsize; if (fseek(f, 0, SEEK_END) != -1) { fsize = ftell(f); if (start_pos >= fsize) { yyerror("Specified start position is greater than length of file"); return; } if ((start_pos + length) > fsize) fatalerror("Specified range in INCBIN is out of bounds"); fseek(f, start_pos, SEEK_SET); } else { if (errno != ESPIPE) yyerror("Error determining size of INCBIN file '%s': %s", 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)) { yyerror("Error reading INCBIN file '%s': %s", s, strerror(errno)); } else { yyerror("Premature end of file (%d bytes left to read)", todo + 1); } } fclose(f); } /* * Section stack routines */ void out_PushSection(void) { struct SectionStackEntry *pSect; pSect = malloc(sizeof(struct SectionStackEntry)); if (pSect == NULL) fatalerror("No memory for section stack"); pSect->pSection = pCurrentSection; pSect->pScope = sym_GetCurrentSymbolScope(); pSect->offset = curOffset; pSect->pNext = pSectionStack; pSectionStack = pSect; /* TODO: maybe set current section to NULL? */ } void out_PopSection(void) { if (pSectionStack == NULL) fatalerror("No entries in the section stack"); if (currentLoadSection) fatalerror("Cannot change the section within a `LOAD` block!"); struct SectionStackEntry *pSect; pSect = pSectionStack; changeSection(); pCurrentSection = pSect->pSection; sym_SetCurrentSymbolScope(pSect->pScope); curOffset = pSect->offset; pSectionStack = pSect->pNext; free(pSect); }