ref: 361326e06c30212eeb7a2359501df522bc850ee1
dir: /src/link/section.c/
/* * This file is part of RGBDS. * * Copyright (c) 2019, Eldred Habert and RGBDS contributors. * * SPDX-License-Identifier: MIT */ #include <stdbool.h> #include "link/main.h" #include "link/section.h" #include "extern/err.h" #include "hashmap.h" HashMap sections; struct ForEachArg { void (*callback)(struct Section *section, void *arg); void *arg; }; static void forEach(void *section, void *arg) { struct ForEachArg *callbackArg = (struct ForEachArg *)arg; callbackArg->callback((struct Section *)section, callbackArg->arg); } void sect_ForEach(void (*callback)(struct Section *, void *), void *arg) { struct ForEachArg callbackArg = { .callback = callback, .arg = arg}; hash_ForEach(sections, forEach, &callbackArg); } void sect_AddSection(struct Section *section) { /* Check if the section already exists */ if (hash_GetElement(sections, section->name)) errx(1, "Section name \"%s\" is already in use", section->name); /* If not, add it */ bool collided = hash_AddElement(sections, section->name, section); if (beVerbose && collided) warnx("Section hashmap collision occurred!"); } struct Section *sect_GetSection(char const *name) { return (struct Section *)hash_GetElement(sections, name); } void sect_CleanupSections(void) { hash_EmptyMap(sections); } static bool sanityChecksFailed; static void doSanityChecks(struct Section *section, void *ptr) { (void)ptr; #define fail(...) do { \ warnx(__VA_ARGS__); \ sanityChecksFailed = true; \ } while (0) /* Sanity check the section's type */ if (section->type < 0 || section->type >= SECTTYPE_INVALID) fail("Section \"%s\" has an invalid type.", section->name); if (is32kMode && section->type == SECTTYPE_ROMX) { if (section->isBankFixed && section->bank != 1) fail("%s: ROMX sections must be in bank 1 with option -t.", section->name); else section->type = SECTTYPE_ROM0; } if (isWRA0Mode && section->type == SECTTYPE_WRAMX) { if (section->isBankFixed && section->bank != 1) fail("%s: WRAMX sections must be in bank 1 with options -w or -d.", section->name); else section->type = SECTTYPE_WRAMX; } if (isDmgMode && section->type == SECTTYPE_VRAM && section->bank == 1) fail("%s: VRAM bank 1 can't be used with option -d.", section->name); /* * Check if alignment is reasonable, this is important to avoid UB * An alignment of zero is equivalent to no alignment, basically */ if (section->isAlignFixed && section->alignMask == 1) section->isAlignFixed = false; uint32_t minbank = bankranges[section->type][0], maxbank = bankranges[section->type][1]; if (section->isBankFixed && section->bank < minbank && section->bank > maxbank) fail(minbank == maxbank ? "Cannot place section \"%s\" in bank %d, it must be %d" : "Cannot place section \"%s\" in bank %d, it must be between %d and %d", section->name, section->bank, minbank, maxbank); /* Check if section has a chance to be placed */ if (section->size > maxsize[section->type]) fail("Section \"%s\" is bigger than the max size for that type: %#x > %#x", section->name, section->size, maxsize[section->type]); /* Translate loose constraints to strong ones when they're equivalent */ if (minbank == maxbank) { section->bank = minbank; section->isBankFixed = true; } if (section->isAlignFixed) { enum SectionType type = section->type; /* It doesn't make sense to have both org and alignment set */ if (section->isAddressFixed) { if (section->org & section->alignMask) fail("Section \"%s\"'s fixed address doesn't match its alignment", section->name); section->isAlignFixed = false; } else if ((endaddr(type) & section->alignMask) == startaddr[type]) { section->org = startaddr[type]; section->isAlignFixed = false; section->isAddressFixed = true; } } if (section->isAddressFixed) { /* Ensure the target address is valid */ if (section->org < startaddr[section->type] || section->org > endaddr(section->type)) fail("Section \"%s\"'s fixed address %#x is outside of range [%#x; %#x]", section->name, section->org, startaddr[section->type], endaddr(section->type)); if (section->org + section->size > endaddr(section->type) + 1) fail("Section \"%s\"'s end address %#x is greater than last address %#x", section->name, section->org + section->size, endaddr(section->type) + 1); } #undef fail } void sect_DoSanityChecks(void) { sect_ForEach(doSanityChecks, NULL); if (sanityChecksFailed) errx(1, "Sanity checks failed"); }