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Diffstat (limited to 'backends/platform/ps2/ps2loader.cpp')
-rw-r--r-- | backends/platform/ps2/ps2loader.cpp | 721 |
1 files changed, 721 insertions, 0 deletions
diff --git a/backends/platform/ps2/ps2loader.cpp b/backends/platform/ps2/ps2loader.cpp new file mode 100644 index 0000000000..ff6702de17 --- /dev/null +++ b/backends/platform/ps2/ps2loader.cpp @@ -0,0 +1,721 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/branches/gsoc2010-plugins/backends/platform/ps2/ps2loader.cpp $ + * TODO: $ID + * + */ + +#if defined(DYNAMIC_MODULES) && defined(__PS2__) + +#include <string.h> +#include <stdarg.h> +#include <stdio.h> +#include <malloc.h> +#include <unistd.h> +#include <sys/_default_fcntl.h> + +#include <ps2utils.h> + +#include "backends/platform/ps2/ps2loader.h" +//#include "backends/platform/ps2/powerman.h" //TODO + +//#define __PS2_DEBUG_PLUGINS__ + +#ifdef __PS2_DEBUG_PLUGINS__ +#define DBG(x,...) fprintf(stderr,x, ## __VA_ARGS__) +#else +#define DBG(x,...) +#endif + +#define seterror(x,...) fprintf(stderr,x, ## __VA_ARGS__) + +extern char __plugin_hole_start; // Indicates start of hole in program file for shorts +extern char __plugin_hole_end; // Indicates end of hole in program file +extern char _gp[]; // Value of gp register + +DECLARE_SINGLETON(ShortSegmentManager) // For singleton + +// Get rid of symbol table in memory +void DLObject::discard_symtab() { + free(_symtab); + free(_strtab); + _symtab = NULL; + _strtab = NULL; + _symbol_cnt = 0; +} + +// Unload all objects from memory +void DLObject::unload() { + discard_symtab(); + free(_segment); + _segment = NULL; + + if (_shortsSegment) { + ShortsMan.deleteSegment(_shortsSegment); + _shortsSegment = NULL; + } +} + +/** + * Follow the instruction of a relocation section. + * + * @param fd File Descriptor + * @param offset Offset into the File + * @param size Size of relocation section + * @param relSegment Base address of relocated segment in memory (memory offset) + * + */ +bool DLObject::relocate(int fd, unsigned long offset, unsigned long size, void *relSegment) { + Elf32_Rel *rel = NULL; // relocation entry + + // Allocate memory for relocation table + if (!(rel = (Elf32_Rel *)malloc(size))) { + seterror("Out of memory."); + return false; + } + + // Read in our relocation table + if (lseek(fd, offset, SEEK_SET) < 0 || + read(fd, rel, size) != (ssize_t)size) { + seterror("Relocation table load failed."); + free(rel); + return false; + } + + // Treat each relocation entry. Loop over all of them + int cnt = size / sizeof(*rel); + + DBG("Loaded relocation table. %d entries. base address=%p\n", cnt, relSegment); + + bool seenHi16 = false; // For treating HI/LO16 commands + int firstHi16 = -1; // Mark the point of the first hi16 seen + Elf32_Addr ahl = 0; // Calculated addend + int a = 0; // Addend: taken from the target + + unsigned int *lastTarget = 0; // For processing hi16 when lo16 arrives + unsigned int relocation = 0; + int debugRelocs[10] = {0}; // For debugging + int extendedHi16 = 0; // Count extended hi16 treatments + Elf32_Addr lastHiSymVal = 0; + bool hi16InShorts = false; + +#define DEBUG_NUM 2 + + // Loop over relocation entries + for (int i = 0; i < cnt; i++) { + // Get the symbol this relocation entry is referring to + Elf32_Sym *sym = (Elf32_Sym *)(_symtab) + (REL_INDEX(rel[i].r_info)); + + // Get the target instruction in the code + unsigned int *target = (unsigned int *)((char *)relSegment + rel[i].r_offset); + + unsigned int origTarget = *target; // Save for debugging + + // Act differently based on the type of relocation + switch (REL_TYPE(rel[i].r_info)) { + + case R_MIPS_HI16: // Absolute addressing. + if (sym->st_shndx < SHN_LOPROC && // Only shift for plugin section (ie. has a real section index) + firstHi16 < 0) { // Only process first in block of HI16s + firstHi16 = i; // Keep the first Hi16 we saw + seenHi16 = true; + ahl = (*target & 0xffff) << 16; // Take lower 16 bits shifted up + + lastHiSymVal = sym->st_value; + hi16InShorts = (ShortsMan.inGeneralSegment((char *)sym->st_value)); // Fix for problem with switching btw segments + if (debugRelocs[0]++ < DEBUG_NUM) // Print only a set number + DBG("R_MIPS_HI16: i=%d, offset=%x, ahl = %x, target = %x\n", + i, rel[i].r_offset, ahl, *target); + } + break; + + case R_MIPS_LO16: // Absolute addressing. Needs a HI16 to come before it + if (sym->st_shndx < SHN_LOPROC) { // Only shift for plugin section. (ie. has a real section index) + if (!seenHi16) { // We MUST have seen HI16 first + seterror("R_MIPS_LO16 w/o preceding R_MIPS_HI16 at relocation %d!\n", i); + free(rel); + return false; + } + + // Fix: bug in gcc makes LO16s connect to wrong HI16s sometimes (shorts and regular segment) + // Note that we can check the entire shorts segment because the executable's shorts don't belong to this plugin section + // and will be screened out above + bool lo16InShorts = ShortsMan.inGeneralSegment((char *)sym->st_value); + + // Correct the bug by getting the proper value in ahl (taken from the current symbol) + if ((hi16InShorts && !lo16InShorts) || (!hi16InShorts && lo16InShorts)) { + ahl -= (lastHiSymVal & 0xffff0000); // We assume gcc meant the same offset + ahl += (sym->st_value & 0xffff0000); + } + + ahl &= 0xffff0000; // Clean lower 16 bits for repeated LO16s + a = *target & 0xffff; // Take lower 16 bits of the target + a = (a << 16) >> 16; // Sign extend them + ahl += a; // Add lower 16 bits. AHL is now complete + + // Fix: we can have LO16 access to the short segment sometimes + if (lo16InShorts) { + relocation = ahl + _shortsSegment->getOffset(); // Add in the short segment offset + } else // It's in the regular segment + relocation = ahl + (Elf32_Addr)_segment; // Add in the new offset for the segment + + if (firstHi16 >= 0) { // We haven't treated the HI16s yet so do it now + for (int j = firstHi16; j < i; j++) { + if (REL_TYPE(rel[j].r_info) != R_MIPS_HI16) continue; // Skip over non-Hi16s + + lastTarget = (unsigned int *)((char *)relSegment + rel[j].r_offset); // get hi16 target + *lastTarget &= 0xffff0000; // Clear the lower 16 bits of the last target + *lastTarget |= (relocation >> 16) & 0xffff; // Take the upper 16 bits of the relocation + if (relocation & 0x8000)(*lastTarget)++; // Subtle: we need to add 1 to the HI16 in this case + } + firstHi16 = -1; // Reset so we'll know we treated it + } else { + extendedHi16++; + } + + *target &= 0xffff0000; // Clear the lower 16 bits of current target + *target |= relocation & 0xffff; // Take the lower 16 bits of the relocation + + if (debugRelocs[1]++ < DEBUG_NUM) + DBG("R_MIPS_LO16: i=%d, offset=%x, a=%x, ahl = %x, lastTarget = %x, origt = %x, target = %x\n", + i, rel[i].r_offset, a, ahl, *lastTarget, origTarget, *target); + if (lo16InShorts && debugRelocs[2]++ < DEBUG_NUM) + DBG("R_MIPS_LO16s: i=%d, offset=%x, a=%x, ahl = %x, lastTarget = %x, origt = %x, target = %x\n", + i, rel[i].r_offset, a, ahl, *lastTarget, origTarget, *target); + } + break; + + case R_MIPS_26: // Absolute addressing (for jumps and branches only) + if (sym->st_shndx < SHN_LOPROC) { // Only relocate for main segment + a = *target & 0x03ffffff; // Get 26 bits' worth of the addend + a = (a << 6) >> 6; // Sign extend a + relocation = ((a << 2) + (Elf32_Addr)_segment) >> 2; // a already points to the target. Subtract our offset + *target &= 0xfc000000; // Clean lower 26 target bits + *target |= (relocation & 0x03ffffff); + + if (debugRelocs[3]++ < DEBUG_NUM) + DBG("R_MIPS_26: i=%d, offset=%x, symbol=%d, stinfo=%x, a=%x, origTarget=%x, target=%x\n", + i, rel[i].r_offset, REL_INDEX(rel[i].r_info), sym->st_info, a, origTarget, *target); + } else { + if (debugRelocs[4]++ < DEBUG_NUM) + DBG("R_MIPS_26: i=%d, offset=%x, symbol=%d, stinfo=%x, a=%x, origTarget=%x, target=%x\n", + i, rel[i].r_offset, REL_INDEX(rel[i].r_info), sym->st_info, a, origTarget, *target); + } + break; + + case R_MIPS_GPREL16: // GP Relative addressing + if (_shortsSegment->getOffset() != 0 && // Only relocate if we shift the shorts section + ShortsMan.inGeneralSegment((char *)sym->st_value)) { // Only relocate things in the plugin hole + a = *target & 0xffff; // Get 16 bits' worth of the addend + a = (a << 16) >> 16; // Sign extend it + + relocation = a + _shortsSegment->getOffset(); + + *target &= 0xffff0000; // Clear the lower 16 bits of the target + *target |= relocation & 0xffff; + + if (debugRelocs[5]++ < DEBUG_NUM) + DBG("R_MIPS_GPREL16: i=%d, a=%x, gpVal=%x, origTarget=%x, target=%x, offset=%x\n", + i, a, _gpVal, origTarget, *target, _shortsSegment->getOffset()); + } + + break; + + case R_MIPS_32: // Absolute addressing + if (sym->st_shndx < SHN_LOPROC) { // Only shift for plugin section. + a = *target; // Get full 32 bits of addend + + if (ShortsMan.inGeneralSegment((char *)sym->st_value)) // Check if we're in the shorts segment + relocation = a + _shortsSegment->getOffset(); // Shift by shorts offset + else // We're in the main section + relocation = a + (Elf32_Addr)_segment; // Shift by main offset + *target = relocation; + + if (debugRelocs[6]++ < DEBUG_NUM) + DBG("R_MIPS_32: i=%d, a=%x, origTarget=%x, target=%x\n", i, a, origTarget, *target); + } + break; + + default: + seterror("Unknown relocation type %x at relocation %d.\n", REL_TYPE(rel[i].r_info), i); + free(rel); + return false; + } + } + + DBG("Done with relocation. extendedHi16=%d\n\n", extendedHi16); + + free(rel); + return true; +} + +bool DLObject::readElfHeader(int fd, Elf32_Ehdr *ehdr) { + // Start reading the elf header. Check for errors + if (read(fd, ehdr, sizeof(*ehdr)) != sizeof(*ehdr) || + memcmp(ehdr->e_ident, ELFMAG, SELFMAG) || // Check MAGIC + ehdr->e_type != ET_EXEC || // Check for executable + ehdr->e_machine != EM_MIPS || // Check for MIPS machine type + ehdr->e_phentsize < sizeof(Elf32_Phdr) || // Check for size of program header + ehdr->e_shentsize != sizeof(Elf32_Shdr)) { // Check for size of section header + seterror("Invalid file type."); + return false; + } + + DBG("phoff = %d, phentsz = %d, phnum = %d\n", + ehdr->e_phoff, ehdr->e_phentsize, ehdr->e_phnum); + + return true; +} + +bool DLObject::readProgramHeaders(int fd, Elf32_Ehdr *ehdr, Elf32_Phdr *phdr, int num) { + // Read program header + if (lseek(fd, ehdr->e_phoff + sizeof(*phdr)*num, SEEK_SET) < 0 || + read(fd, phdr, sizeof(*phdr)) != sizeof(*phdr)) { + seterror("Program header load failed."); + return false; + } + + // Check program header values + if (phdr->p_type != PT_LOAD || phdr->p_filesz > phdr->p_memsz) { + seterror("Invalid program header."); + return false; + } + + DBG("offs = %x, filesz = %x, memsz = %x, align = %x\n", + phdr->p_offset, phdr->p_filesz, phdr->p_memsz, phdr->p_align); + + return true; + +} + +bool DLObject::loadSegment(int fd, Elf32_Phdr *phdr) { + + char *baseAddress = 0; + + // We need to take account of non-allocated segment for shorts + if (phdr->p_flags & PF_X) { // This is a relocated segment + + // Attempt to allocate memory for segment + int extra = phdr->p_vaddr % phdr->p_align; // Get extra length TODO: check logic here + DBG("extra mem is %x\n", extra); + + if (phdr->p_align < 0x10000) phdr->p_align = 0x10000; // Fix for wrong alignment on e.g. AGI + + if (!(_segment = (char *)memalign(phdr->p_align, phdr->p_memsz + extra))) { + seterror("Out of memory.\n"); + return false; + } + DBG("allocated segment @ %p\n", _segment); + + // Get offset to load segment into + baseAddress = (char *)_segment + phdr->p_vaddr; + _segmentSize = phdr->p_memsz + extra; + } else { // This is a shorts section. + _shortsSegment = ShortsMan.newSegment(phdr->p_memsz, (char *)phdr->p_vaddr); + + baseAddress = _shortsSegment->getStart(); + DBG("shorts segment @ %p to %p. Segment wants to be at %x. Offset=%x\n", + _shortsSegment->getStart(), _shortsSegment->getEnd(), phdr->p_vaddr, _shortsSegment->getOffset()); + + } + + // Set bss segment to 0 if necessary (assumes bss is at the end) + if (phdr->p_memsz > phdr->p_filesz) { + DBG("Setting %p to %p to 0 for bss\n", baseAddress + phdr->p_filesz, baseAddress + phdr->p_memsz); + memset(baseAddress + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz); + } + // Read the segment into memory + if (lseek(fd, phdr->p_offset, SEEK_SET) < 0 || + read(fd, baseAddress, phdr->p_filesz) != (ssize_t)phdr->p_filesz) { + seterror("Segment load failed."); + return false; + } + + return true; +} + + +Elf32_Shdr * DLObject::loadSectionHeaders(int fd, Elf32_Ehdr *ehdr) { + + Elf32_Shdr *shdr = NULL; + + // Allocate memory for section headers + if (!(shdr = (Elf32_Shdr *)malloc(ehdr->e_shnum * sizeof(*shdr)))) { + seterror("Out of memory."); + return NULL; + } + + // Read from file into section headers + if (lseek(fd, ehdr->e_shoff, SEEK_SET) < 0 || + read(fd, shdr, ehdr->e_shnum * sizeof(*shdr)) != + (ssize_t)(ehdr->e_shnum * sizeof(*shdr))) { + seterror("Section headers load failed."); + return NULL; + } + + return shdr; +} + +int DLObject::loadSymbolTable(int fd, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) { + + // Loop over sections, looking for symbol table linked to a string table + for (int i = 0; i < ehdr->e_shnum; i++) { + //DBG("Section %d: type = %x, size = %x, entsize = %x, link = %x\n", + // i, shdr[i].sh_type, shdr[i].sh_size, shdr[i].sh_entsize, shdr[i].sh_link); + + if (shdr[i].sh_type == SHT_SYMTAB && + shdr[i].sh_entsize == sizeof(Elf32_Sym) && + shdr[i].sh_link < ehdr->e_shnum && + shdr[shdr[i].sh_link].sh_type == SHT_STRTAB && + _symtab_sect < 0) { + _symtab_sect = i; + } + } + + // Check for no symbol table + if (_symtab_sect < 0) { + seterror("No symbol table."); + return -1; + } + + DBG("Symbol section at section %d, size %x\n", _symtab_sect, shdr[_symtab_sect].sh_size); + + // Allocate memory for symbol table + if (!(_symtab = malloc(shdr[_symtab_sect].sh_size))) { + seterror("Out of memory."); + return -1; + } + + // Read symbol table into memory + if (lseek(fd, shdr[_symtab_sect].sh_offset, SEEK_SET) < 0 || + read(fd, _symtab, shdr[_symtab_sect].sh_size) != + (ssize_t)shdr[_symtab_sect].sh_size) { + seterror("Symbol table load failed."); + return -1; + } + + // Set number of symbols + _symbol_cnt = shdr[_symtab_sect].sh_size / sizeof(Elf32_Sym); + DBG("Loaded %d symbols.\n", _symbol_cnt); + + return _symtab_sect; + +} + +bool DLObject::loadStringTable(int fd, Elf32_Shdr *shdr) { + + int string_sect = shdr[_symtab_sect].sh_link; + + // Allocate memory for string table + if (!(_strtab = (char *)malloc(shdr[string_sect].sh_size))) { + seterror("Out of memory."); + return false; + } + + // Read string table into memory + if (lseek(fd, shdr[string_sect].sh_offset, SEEK_SET) < 0 || + read(fd, _strtab, shdr[string_sect].sh_size) != + (ssize_t)shdr[string_sect].sh_size) { + seterror("Symbol table strings load failed."); + return false; + } + return true; +} + +void DLObject::relocateSymbols(Elf32_Addr offset, Elf32_Addr shortsOffset) { + + int shortsCount = 0, othersCount = 0; + DBG("Relocating symbols by %x. Shorts offset=%x\n", offset, shortsOffset); + + // Loop over symbols, add relocation offset + Elf32_Sym *s = (Elf32_Sym *)_symtab; + for (int c = _symbol_cnt; c--; s++) { + // Make sure we don't relocate special valued symbols + if (s->st_shndx < SHN_LOPROC) { + if (!ShortsMan.inGeneralSegment((char *)s->st_value)) { + othersCount++; + s->st_value += offset; + if (s->st_value < (Elf32_Addr)_segment || s->st_value > (Elf32_Addr)_segment + _segmentSize) + seterror("Symbol out of bounds! st_value = %x\n", s->st_value); + } else { // shorts section + shortsCount++; + s->st_value += shortsOffset; + if (!_shortsSegment->inSegment((char *)s->st_value)) + seterror("Symbol out of bounds! st_value = %x\n", s->st_value); + } + + } + + } + + DBG("Relocated %d short symbols, %d others.\n", shortsCount, othersCount); +} + +bool DLObject::relocateRels(int fd, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) { + + // Loop over sections, finding relocation sections + for (int i = 0; i < ehdr->e_shnum; i++) { + + Elf32_Shdr *curShdr = &(shdr[i]); + //Elf32_Shdr *linkShdr = &(shdr[curShdr->sh_info]); + + if (curShdr->sh_type == SHT_REL && // Check for a relocation section + curShdr->sh_entsize == sizeof(Elf32_Rel) && // Check for proper relocation size + (int)curShdr->sh_link == _symtab_sect && // Check that the sh_link connects to our symbol table + curShdr->sh_info < ehdr->e_shnum && // Check that the relocated section exists + (shdr[curShdr->sh_info].sh_flags & SHF_ALLOC)) { // Check if relocated section resides in memory + if (!ShortsMan.inGeneralSegment((char *)shdr[curShdr->sh_info].sh_addr)) { // regular segment + if (!relocate(fd, curShdr->sh_offset, curShdr->sh_size, _segment)) { + return false; + } + } else { // In Shorts segment + if (!relocate(fd, curShdr->sh_offset, curShdr->sh_size, (void *)_shortsSegment->getOffset())) { + return false; + } + } + + } + } + + return true; +} + + +bool DLObject::load(int fd) { + fprintf(stderr, "In DLObject::load\n"); + + Elf32_Ehdr ehdr; // ELF header + Elf32_Phdr phdr; // Program header + Elf32_Shdr *shdr; // Section header + bool ret = true; + + if (readElfHeader(fd, &ehdr) == false) { + return false; + } + + for (int i = 0; i < ehdr.e_phnum; i++) { // Load our 2 segments + + fprintf(stderr, "Loading segment %d\n", i); + + if (readProgramHeaders(fd, &ehdr, &phdr, i) == false) + return false; + + if (!loadSegment(fd, &phdr)) + return false; + } + + if ((shdr = loadSectionHeaders(fd, &ehdr)) == NULL) + ret = false; + + if (ret && ((_symtab_sect = loadSymbolTable(fd, &ehdr, shdr)) < 0)) + ret = false; + + if (ret && (loadStringTable(fd, shdr) == false)) + ret = false; + + if (ret) + relocateSymbols((Elf32_Addr)_segment, _shortsSegment->getOffset()); // Offset by our segment allocated address + + if (ret && (relocateRels(fd, &ehdr, shdr) == false)) + ret = false; + + free(shdr); + + return ret; +} + +bool DLObject::open(const char *path) { + int fd; + void *ctors_start, *ctors_end; + + DBG("open(\"%s\")\n", path); + + // Get the address of the global pointer + _gpVal = (unsigned int) & _gp; + DBG("_gpVal is %x\n", _gpVal); + + PowerMan.beginCriticalSection(); + + if ((fd = ::open(path, O_RDONLY)) < 0) { + seterror("%s not found.", path); + return false; + } + + // Try to load and relocate + if (!load(fd)) { + ::close(fd); + unload(); + return false; + } + + ::close(fd); + + PowerMan.endCriticalSection(); + + // flush data cache + sceKernelDcacheWritebackAll(); + + // Get the symbols for the global constructors and destructors + ctors_start = symbol("___plugin_ctors"); + ctors_end = symbol("___plugin_ctors_end"); + _dtors_start = symbol("___plugin_dtors"); + _dtors_end = symbol("___plugin_dtors_end"); + + if (ctors_start == NULL || ctors_end == NULL || _dtors_start == NULL || + _dtors_end == NULL) { + seterror("Missing ctors/dtors."); + _dtors_start = _dtors_end = NULL; + unload(); + return false; + } + + DBG("Calling constructors.\n"); + for (void (**f)(void) = (void (**)(void))ctors_start; f != ctors_end; f++) + (**f)(); + + DBG("%s opened ok.\n", path); + return true; +} + +bool DLObject::close() { + if (_dtors_start != NULL && _dtors_end != NULL) + for (void (**f)(void) = (void (**)(void))_dtors_start; f != _dtors_end; f++) + (**f)(); + _dtors_start = _dtors_end = NULL; + unload(); + return true; +} + +void *DLObject::symbol(const char *name) { + DBG("symbol(\"%s\")\n", name); + + if (_symtab == NULL || _strtab == NULL || _symbol_cnt < 1) { + seterror("No symbol table loaded."); + return NULL; + } + + Elf32_Sym *s = (Elf32_Sym *)_symtab; + for (int c = _symbol_cnt; c--; s++) { + + // We can only import symbols that are global or weak in the plugin + if ((SYM_BIND(s->st_info) == STB_GLOBAL || SYM_BIND(s->st_info) == STB_WEAK) && + /*_strtab[s->st_name] == '_' && */ // Try to make this more efficient + !strcmp(name, _strtab + s->st_name)) { + + // We found the symbol + DBG("=> %p\n", (void*)s->st_value); + return (void*)s->st_value; + } + } + + seterror("Symbol \"%s\" not found.", name); + return NULL; +} + + + +ShortSegmentManager::ShortSegmentManager() { + _shortsStart = &__plugin_hole_start ; + _shortsEnd = &__plugin_hole_end; +} + +ShortSegmentManager::Segment *ShortSegmentManager::newSegment(int size, char *origAddr) { + char *lastAddress = origAddr; + Common::List<Segment *>::iterator i; + + // Find a block that fits, starting from the beginning + for (i = _list.begin(); i != _list.end(); ++i) { + char *currAddress = (*i)->getStart(); + + if ((int)(currAddress - lastAddress) >= size) break; + + lastAddress = (*i)->getEnd(); + } + + if ((Elf32_Addr)lastAddress & 3) + lastAddress += 4 - ((Elf32_Addr)lastAddress & 3); // Round up to multiple of 4 + + if (lastAddress + size > _shortsEnd) { + seterror("Error. No space in shorts segment for %x bytes. Last address is %p, max address is %p.\n", + size, lastAddress, _shortsEnd); + return NULL; + } + + Segment *seg = new Segment(lastAddress, size, origAddr); // Create a new segment + + if (lastAddress + size > _highestAddress) _highestAddress = lastAddress + size; // Keep track of maximum + + _list.insert(i, seg); + + DBG("Shorts segment size %x allocated. End = %p. Remaining space = %x. Highest so far is %p.\n", + size, lastAddress + size, _shortsEnd - _list.back()->getEnd(), _highestAddress); + + return seg; +} + +void ShortSegmentManager::deleteSegment(ShortSegmentManager::Segment *seg) { + DBG("Deleting shorts segment from %p to %p.\n\n", seg->getStart(), seg->getEnd()); + _list.remove(seg); + delete seg; +} + +static char dlerr[MAXDLERRLEN]; + +void *dlopen(const char *filename, int flags) { + DLObject *obj = new DLObject(dlerr); + if (obj->open(filename)) + return (void *)obj; + delete obj; + return NULL; +} + +int dlclose(void *handle) { + DLObject *obj = (DLObject *)handle; + if (obj == NULL) { + strcpy(dlerr, "Handle is NULL."); + return -1; + } + if (obj->close()) { + delete obj; + return 0; + } + return -1; +} + +void *dlsym(void *handle, const char *symbol) { + if (handle == NULL) { + strcpy(dlerr, "Handle is NULL."); + return NULL; + } + return ((DLObject *)handle)->symbol(symbol); +} + +const char *dlerror() { + return dlerr; +} + +void dlforgetsyms(void *handle) { + if (handle != NULL) + ((DLObject *)handle)->discard_symtab(); +} + + +#endif /* DYNAMIC_MODULES && __PS2__ */ |