/*********************************************************************** * toolchain/nxflat/ldnxflat.c * Convert ELF (or any BFD format) to NXFLAT binary format * * ldnxflat takes a fully resolvable elf binary which was linked with -r * and resolves all references, then generates relocation table entries for * any relocation entries in data sections. This is designed to work with * the options -fpic -msingle-pic-base (and -mno-got or -membedded-pic, but * will and GOT relocations as well). * * Copyright (C) 2009 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * * Modified from ldelf2xflat (see http://xflat.org): * * Copyright (c) 2002, 2006, Cadenux, LLC. All rights reserved. * Copyright (c) 2002, 2006, Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Extended from the FLAT ldnxflat.c (original copyright below ) * * Copyright (C) 2000 NETsilicon, Inc. * Copyright (C) 2000 WireSpeed Communications Corp * * author : Joe deBlaquiere ( joe@wirespeed.com ) * * converted from elf2flt.c ( original copyright below ) * * elf2flt copyright : * * (c) 1999, Greg Ungerer * (c) 1999, Phil Blundell, Nexus Electronics Ltd * * Hacked this about badly to fully support relocating binaries. * * Originally obj-res.c * * (c) 1998, Kenneth Albanowski * (c) 1998, D. Jeff Dionne * (c) 1998, The Silver Hammer Group Ltd. * (c) 1996, 1997 Dionne & Associates * jeff@ryeham.ee.ryerson.ca * * Relocation added March 1997, Kresten Krab Thorup * krab@california.daimi.aau.dk * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * ***********************************************************************/ /*********************************************************************** * Included Files ***********************************************************************/ #include #include #include #include #include #include #include #include #include #include #include "bfd.h" #include "arch/arch.h" #include "nxflat.h" /*********************************************************************** * Compilation Switches ***********************************************************************/ /* #define RELOCS_IN_NETWORK_ORDER 1 */ #define LIBS_CAN_INCLUDE_LIBS 1 /* Debug output */ #if 0 # define message(fmt, arg...) printf("%s: " fmt, __func__, ##arg) # define dbg(fmt, arg...) if (verbose) printf("%s: " fmt, __func__, ##arg) # define vdbg(fmt, arg...) if (verbose > 1) printf("%s: " fmt, __func__, ##arg) #else # define message(fmt, arg...) printf(fmt, ##arg) # define dbg(fmt, arg...) if (verbose) printf(fmt, ##arg) # define vdbg(fmt, arg...) if (verbose > 1) printf(fmt, ##arg) #endif #define err(fmt, arg...) fprintf(stderr, "ERROR -- " fmt, ##arg) #define warn(fmt, arg...) fprintf(stderr, "WARNING -- " fmt, ##arg) /*********************************************************************** * Definitions ***********************************************************************/ #ifndef PARAMS # define PARAMS(x) x #endif #ifdef __CYGWIN32__ # define O_PLATFORM O_BINARY #else # define O_PLATFORM 0 #endif #define MAX_SECTIONS 16 #define DEFAULT_STACK_SIZE 4096 #define IS_GLOBAL(x) ((((x)->flags)&(BSF_GLOBAL))!=0) #define NXFLAT_HDR_SIZE sizeof(struct nxflat_hdr_s) /* The names of these fields have changed in later versions of binutils * (after 2.13 and before 2.15) and the meaning of _rawsize is has also * changed somewhat. In the same timeframe, the name of the section * structure changed. */ #if 0 # define COOKED_SIZE _cooked_size # define RAW_SIZE _raw_size # define bfd_section sec #else # define COOKED_SIZE size # define RAW_SIZE rawsize #endif #define NXFLAT_RELOC_TARGET_TEXT 0 #define NXFLAT_RELOC_TARGET_DATA 1 #define NXFLAT_RELOC_TARGET_RODATA 2 #define NXFLAT_RELOC_TARGET_BSS 3 #define NXFLAT_RELOC_TARGET_UNKNOWN 4 /*********************************************************************** * Private Types ***********************************************************************/ /* Needs to match definition in include/elf/internal.h. This is from binutils-2.19.1 */ struct elf_internal_sym { bfd_vma st_value; /* Value of the symbol */ bfd_vma st_size; /* Associated symbol size */ unsigned long st_name; /* Symbol name, index in string tbl */ unsigned char st_info; /* Type and binding attributes */ unsigned char st_other; /* Visibilty, and target specific */ unsigned int st_shndx; /* Associated section index */ }; typedef struct { /* The BFD symbol. */ asymbol symbol; /* ELF symbol information. */ struct elf_internal_sym internal_elf_sym; /* Backend specific information. */ union { unsigned int hppa_arg_reloc; void *mips_extr; void *any; } tc_data; /* Version information. This is from an Elf_Internal_Versym structure in a * SHT_GNU_versym section. It is zero if there is no version information. */ u_int16_t version; } elf_symbol_type; typedef struct _segment_info { const char *name; bfd_vma low_mark; bfd_vma high_mark; size_t size; void *contents; asection *subsect[MAX_SECTIONS]; int nsubsects; } segment_info; typedef void (*func_type) (asymbol * sym, void *arg1, void *arg2, void *arg3); /* This structure defines the got entry for one symbol */ struct nxflat_got_s { asymbol *sym; /* Symbol */ u_int32_t offset; /* GOT offset for this symbol */ }; /*********************************************************************** * Private Variable Data ***********************************************************************/ static int verbose = 0; static int dsyms = 0; static int stack_size = 0; static int nerrors = 0; static int32_t counter = 0; static const char *program_name = NULL; static const char *bfd_filename = NULL; static const char *entry_name = NULL; static char *out_filename = NULL; static segment_info text_info; static segment_info data_info; static segment_info bss_info; static asymbol **symbol_table = NULL; static int32_t number_of_symbols = 0; static asymbol *entry_symbol = NULL; static asymbol *dynimport_begin_symbol = NULL; static asymbol *dynimport_end_symbol = NULL; struct nxflat_reloc_s *nxflat_relocs; static int nxflat_nrelocs; static struct nxflat_got_s *got_offsets; /* realloc'ed array of GOT entry descriptions */ static u_int32_t got_size; /* The size of the GOT to be allocated */ int ngot_offsets; /* Number of GOT offsets in got_offsets[] */ /*********************************************************************** * Private Constant Data ***********************************************************************/ static const char default_exe_entry_name[] = "_start"; static const char dynimport_begin_name[] = "__dynimport_begin"; static const char dynimport_end_name[] = "__dynimport_end"; /*********************************************************************** * Private Functions ***********************************************************************/ /*********************************************************************** * nxflat_swap32 ***********************************************************************/ #ifdef ARCH_BIG_ENDIAN static inline u_int32_t nxflat_swap32(u_int32_t little) { u_int32_t big = ((little >> 24) & 0xff) | (((little >> 16) & 0xff) << 8) | (((little >> 8) & 0xff) << 16) | ((little & 0xff) << 24); return big; } #endif /*********************************************************************** * get_xflat32 ***********************************************************************/ static inline u_int32_t get_xflat32(u_int32_t * addr32) { return ntohl(*addr32); } /*********************************************************************** * put_xflat32 ***********************************************************************/ static void inline put_xflat32(u_int32_t * addr32, u_int32_t val32) { *addr32 = htonl(val32); } /*********************************************************************** * put_xflat16 ***********************************************************************/ static void inline put_xflat16(u_int16_t * addr16, u_int16_t val16) { #if 1 *addr16 = htons(val16); #else u_int32_t *addr32 = (u_int32_t *) (((u_int32_t) addr16) & ~3); u_int32_t ndx = ((((u_int32_t) addr16) >> 1) & 1); union { u_int16_t hw[2]; u_int32_t w; } uword; /* Fetch the 32 bit value */ uword.w = get_xflat32(addr32); /* Add in the 16 bit value */ uword.hw[ndx] = val16; /* Then save the 32-bit value */ put_xflat32(addr32, uword.w); #endif } /*********************************************************************** * nxflat_write ***********************************************************************/ static void nxflat_write(int fd, const char *buffer, int buflen) { vdbg("Writing fd: %d buffer: %p buflen: %d\n", fd, buffer, buflen); /* Dump the entire buffer if very strong debug is selected */ if (verbose > 2) { static int offset = 0; const unsigned char *ptr = (const unsigned char *)buffer; int i; int j; for (i = 0; i < buflen; i += 32) { printf("%08x:", offset + i); for (j = 0; j < 32 && (i + j) < buflen; j++) { printf(" %02x", *ptr++); } printf("\n"); } offset += buflen; } /* Write the data to file, handling errors and interruptions */ do { ssize_t nwritten = write(fd, buffer, buflen); if (nwritten < 0) { if (errno != EINTR) { err("Write to output file failed: %s\n", strerror(errno)); exit(1); } } else { buffer += nwritten; buflen -= nwritten; } } while (buflen > 0); } /*********************************************************************** * get_symbols ***********************************************************************/ static asymbol **get_symbols(bfd *abfd, int32_t *num) { int32_t storage_needed; if (dsyms) { storage_needed = bfd_get_dynamic_symtab_upper_bound(abfd); } else { storage_needed = bfd_get_symtab_upper_bound(abfd); } if (storage_needed < 0) { abort(); } if (storage_needed == 0) { return NULL; } symbol_table = (asymbol**)malloc(storage_needed); if (dsyms) { number_of_symbols = bfd_canonicalize_dynamic_symtab(abfd, symbol_table); } else { number_of_symbols = bfd_canonicalize_symtab(abfd, symbol_table); } if (number_of_symbols < 0) { abort(); } *num = number_of_symbols; vdbg("Read %ld symbols\n", (long)number_of_symbols); return symbol_table; } /*********************************************************************** * traverse_global_symbols ***********************************************************************/ static void traverse_global_symbols(void *arg1, void *arg2, void *arg3, func_type fn) { int i; for (i = 0; i < number_of_symbols; i++) { /* Check if it is a global function symbol defined in this */ if (IS_GLOBAL(symbol_table[i])) { /* Yes, process the symbol */ fn(symbol_table[i], arg1, arg2, arg3); } } } /*********************************************************************** * check_special_symbol ***********************************************************************/ static void check_special_symbol(asymbol * sym, void *arg1, void *arg2, void *arg3) { if ((entry_name) && (strcmp(entry_name, sym->name) == 0)) { entry_symbol = sym; } else if (strcmp(dynimport_begin_name, sym->name) == 0) { dynimport_begin_symbol = sym; } else if (strcmp(dynimport_end_name, sym->name) == 0) { dynimport_end_symbol = sym; } counter++; } /*********************************************************************** * find_special_symbols ***********************************************************************/ static void inline find_special_symbols(void) { counter = 0; traverse_global_symbols(NULL, NULL, NULL, check_special_symbol); if (entry_symbol == NULL) { err("Executable entry point \"%s\" not found\n", entry_name); exit(1); } if (dynimport_begin_symbol == NULL) { warn("Special symbol \"%s\" not found\n", dynimport_begin_name); dynimport_end_symbol = NULL; } else if (dynimport_end_symbol == NULL) { err("Symbol \"%s\" found, but missing \"%s\"\n", dynimport_begin_name, dynimport_end_name); exit(1); } } /*********************************************************************** * put_special_symbol ***********************************************************************/ static void put_special_symbol(asymbol *begin_sym, asymbol *end_sym, u_int32_t *addr, u_int16_t *count, u_int32_t elem_size, u_int32_t offset) { u_int32_t file_offset = 0; u_int32_t elems = 0; u_int32_t begin_sym_value; u_int32_t begin_sect_vma; /* We'll assume its okay if this symbol was not found. */ if (begin_sym != NULL) { vdbg("begin: '%s' end: '%s' offset: %08lx\n", begin_sym->name, end_sym->name, (long)(NXFLAT_HDR_SIZE+offset)); /* Get the value of the beginning symbol and the section that it is * defined in. */ begin_sym_value = begin_sym->value; if (begin_sym->section == NULL) { err("No section for symbol \"%s\"\n", begin_sym->name); exit(1); } else { /* Get the file offset to the beginning symbol */ begin_sect_vma = begin_sym->section->vma; file_offset = NXFLAT_HDR_SIZE + /* Size of the NXFLAT header */ begin_sect_vma + /* Virtual address of section */ begin_sym_value + /* Value of the symbol */ offset; /* Additional file offset */ /* If there is a begin symbol, then there MUST be a corresponding * ending symbol. We must have this to get the size of the data * structure. This size will be used to determined the number of * elements in the array. */ if (end_sym == NULL) { /* No matching end symbol */ err("ERROR: Begin sym \"%s\" found, no corresponding end\n", begin_sym->name); exit(1); } else if (end_sym->section == NULL) { /* No section associated with the end symbol */ err("No section for symbol \"%s\"\n", end_sym->name); exit(1); } else if (end_sym->section != begin_sym->section) { /* Section associated with the end symbol is not the same as the * section associated with the begin symbol. */ err("Begin sym \"%s\" is defined in section \"%s\"\n", begin_sym->name, begin_sym->section->name); err(" but sym \"%s\" is defined in section \"%s\"\n", end_sym->name, end_sym->section->name); exit(1); } else if (end_sym->value < begin_sym_value) { /* End symbol is before the begin symbol? */ err("Begin sym \"%s\" lies at offset %d in section \"%s\"\n", begin_sym->name, begin_sym_value, begin_sym->section->name); err(" but sym \"%s\" is before that at offset: %ld\n", end_sym->name, (long)end_sym->value); exit(1); } else { /* Get the size of the structure in bytes */ u_int32_t array_size = end_sym->value - begin_sym_value; /* Get the number of elements in the structure. */ elems = array_size / elem_size; /* Verify that there are an even number of elements in the array. */ if (elems * elem_size != array_size) { err("Array size (%d) is not a multiple of the element size (%d)\n", array_size, elem_size); exit(1); } } } dbg("Symbol %s: value: %08x section offset: %08x file offset: %08x count: %d\n", begin_sym->name, begin_sym_value, begin_sect_vma, file_offset, elems); } put_xflat32(addr, file_offset); put_xflat16(count, elems); } /*********************************************************************** * put_entry_point ***********************************************************************/ static void put_entry_point(struct nxflat_hdr_s *hdr) { u_int32_t entry_point = 0; if (entry_symbol) { struct bfd_section *sect; /* Does this symbol lie in the text section? */ sect = entry_symbol->section; if (sect == NULL) { err("No section for entry symbol \"%s\"\n", entry_symbol->name); exit(1); } /* Get the file offset to the entry point symbol */ entry_point = NXFLAT_HDR_SIZE + sect->vma + entry_symbol->value; printf("Entry symbol \"%s\": %08x in section \"%s\"\n", entry_symbol->name, entry_point, sect->name); dbg(" HDR: %08lx + Section VMA: %08lx + Symbol Value: %08lx\n", (long)NXFLAT_HDR_SIZE, (long)sect->vma, (long)entry_symbol->value); } /* Does the entry point lie within the text region? */ if ((entry_point < NXFLAT_HDR_SIZE) || (entry_point >= NXFLAT_HDR_SIZE + text_info.size)) { /* No... One special case: A shared library may not need an * initialization entry point. */ if (entry_point == 0) { /* Complain a little in this case... The used might have intended to * specify one. */ warn("Library has no initialization entry point\n"); } else { /* Otherwise, complain a lot. We either have a program with no * entry_point or a bogus entry_point. */ err("Invalid entry point: %08x\n", entry_point); err(" Valid TEXT range: %08lx - %08lx\n", (long)NXFLAT_HDR_SIZE, (long)(NXFLAT_HDR_SIZE + text_info.size)); exit(1); } } /* Put the entry point into the NXFLAT header. */ put_xflat32(&hdr->h_entry, entry_point); } /*********************************************************************** * get_reloc_type ***********************************************************************/ static int get_reloc_type(asection *sym_section, segment_info **sym_segment) { int i; /* Locate the address referred to by section type. In the context in which * this runs, we can no longer use the flags field (it is zero for some * reason). But we can search for matches with the buffered section * pointers. */ /* Check if the symbol is defined in a BSS section */ for (i = 0; i < bss_info.nsubsects; i++) { if (bss_info.subsect[i] == sym_section) { /* Yes... */ vdbg("Sym section %s is BSS\n", sym_section->name); if (sym_segment) { *sym_segment = &bss_info; } return NXFLAT_RELOC_TARGET_BSS; } } /* Check if the symbol is defined in a TEXT section */ for (i = 0; i < text_info.nsubsects; i++) { if (text_info.subsect[i] == sym_section) { /* Yes... */ vdbg("Sym section %s is CODE\n", sym_section->name); if (sym_segment) { *sym_segment = &text_info; } return NXFLAT_RELOC_TARGET_TEXT; } } /* Check if the symbol is defined in a DATA section */ for (i = 0; i < data_info.nsubsects; i++) { if (data_info.subsect[i] == sym_section) { /* Yes... */ vdbg("Sym section %s is DATA\n", sym_section->name); if (sym_segment) { *sym_segment = &data_info; } return NXFLAT_RELOC_TARGET_DATA; } } err("Could not find region for sym_section \"%s\" (%p)\n", sym_section->name, sym_section); return NXFLAT_RELOC_TARGET_UNKNOWN; } /*********************************************************************** * find_got_entry ***********************************************************************/ /* Find the GOT entry for a particular symbol index */ static struct nxflat_got_s *find_got_entry(asymbol *sym) { int i; for (i = 0; i < ngot_offsets; i++) { if (got_offsets[i].sym == sym) { return &got_offsets[i]; } } return NULL; } /*********************************************************************** * alloc_got_entry ***********************************************************************/ /* Allocate a new got entry */ static void alloc_got_entry(asymbol *sym) { struct nxflat_got_s *newgot; int noffsets; /* First, make sure that we don't already have an entry for this symbol */ if (find_got_entry(sym) == 0) { /* Realloc the array of GOT offsets to hold one more */ noffsets = ngot_offsets + 1; newgot = (struct nxflat_got_s *)realloc(got_offsets, sizeof(struct nxflat_got_s) * noffsets); if (!newgot) { err("Failed to extend the GOT offset table. noffsets: %d\n", noffsets); } else { /* Add the new symbol offset to the end of the reallocated table */ newgot[ngot_offsets].sym = sym; newgot[ngot_offsets].offset = got_size; /* Update counts and sizes */ got_offsets = newgot; ngot_offsets = noffsets; got_size = sizeof(u_int32_t) * noffsets; } } } /*********************************************************************** * relocate_rel32 ***********************************************************************/ static void relocate_rel32(arelent *relp, int32_t *target, symvalue sym_value) { reloc_howto_type *how_to = relp->howto; asymbol *rel_sym = *relp->sym_ptr_ptr; asection *rel_section = rel_sym->section; int32_t value; int32_t temp; int32_t saved; if (verbose > 1) { vdbg(" Original location %p is %08lx ", #ifdef ARCH_BIG_ENDIAN target, (long)nxflat_swap32(*target)); #else target, (long)*target); #endif if (verbose > 2) { printf("rsh %d ", how_to->rightshift); printf(" sz %d ", how_to->size); printf("bit %d ", how_to->bitsize); printf("rel %d ", how_to->pc_relative); printf("smask %08lx ", (long)how_to->src_mask); printf("dmask %08lx ", (long)how_to->dst_mask); printf("off %d ", how_to->pcrel_offset); } printf("\n"); } #ifdef ARCH_BIG_ENDIAN saved = temp = (int32_t) nxflat_swap32(*target); #else saved = temp = *target; #endif /* Mask and sign extend */ temp &= how_to->src_mask; temp <<= (32 - how_to->bitsize); temp >>= (32 - how_to->bitsize); /* Calculate the new value: Current value + VMA - current PC */ value = temp + sym_value + rel_section->vma - relp->address; /* Offset */ temp += (value >> how_to->rightshift); /* Mask upper bits from rollover */ temp &= how_to->dst_mask; /* Replace data that was masked */ temp |= saved & (~how_to->dst_mask); vdbg(" Modified location: %08lx\n", (long)temp); #ifdef ARCH_BIG_ENDIAN *target = (long)nxflat_swap32(temp); #else *target = (long)temp; #endif } /*********************************************************************** * relocate_abs32 ***********************************************************************/ static void relocate_abs32(arelent *relp, int32_t *target, symvalue sym_value) { reloc_howto_type *how_to = relp->howto; asymbol *rel_sym = *relp->sym_ptr_ptr; asection *rel_section = rel_sym->section; struct nxflat_reloc_s *relocs; int32_t temp; int32_t saved; int reloc_type; /* ABS32 links from .text are easy - since the fetches will * always be base relative. the ABS32 refs from data will be * handled the same */ if (verbose > 1) { vdbg(" Original location %p is %08lx ", #ifdef ARCH_BIG_ENDIAN target, (long)nxflat_swap32(*target)); #else target, (long)*target); #endif if (verbose > 2) { printf("rsh %d ", how_to->rightshift); printf(" sz %d ", how_to->size); printf("bit %d ", how_to->bitsize); printf("rel %d ", how_to->pc_relative); printf("smask %08lx ", (long)how_to->src_mask); printf("dmask %08lx ", (long)how_to->dst_mask); printf("off %d ", how_to->pcrel_offset); } printf("\n"); } #ifdef ARCH_BIG_ENDIAN saved = temp = (int32_t) nxflat_swap32(*target); #else saved = temp = *target; #endif /* Mask and sign extend */ temp &= how_to->src_mask; temp <<= (32 - how_to->bitsize); temp >>= (32 - how_to->bitsize); /* Offset */ temp += (sym_value + rel_section->vma) >> how_to->rightshift; /* Mask upper bits from rollover */ temp &= how_to->dst_mask; /* Replace data that was masked */ temp |= saved & (~how_to->dst_mask); vdbg(" Modified location: %08lx\n", (long)temp); #ifdef ARCH_BIG_ENDIAN *target = (long)nxflat_swap32(temp); #else *target = (long)temp; #endif /* Determine where the symbol lies */ switch (get_reloc_type(rel_section, NULL)) { case NXFLAT_RELOC_TARGET_UNKNOWN: default: { err("Symbol relocation section type is unknown\n"); nerrors++; } /* Fall through and do something wrong */ case NXFLAT_RELOC_TARGET_BSS: case NXFLAT_RELOC_TARGET_DATA: { vdbg("Symbol '%s' lies in D-Space\n", rel_sym->name); reloc_type = NXFLAT_RELOC_TYPE_REL32D; } break; case NXFLAT_RELOC_TARGET_TEXT: { vdbg("Symbol '%s' lies in I-Space\n", rel_sym->name); reloc_type = NXFLAT_RELOC_TYPE_REL32I; } break; } /* Re-allocate memory to include this relocation */ relocs = (struct nxflat_reloc_s*) realloc(nxflat_relocs, sizeof(struct nxflat_reloc_s) * (nxflat_nrelocs + 1)); if (!relocs) { err("Failed to re-allocate memory ABS32 relocations (%d relocations)\n", nxflat_nrelocs); nerrors++; } else { /* Reallocation was successful. Update globals */ nxflat_nrelocs++; nxflat_relocs = relocs; /* Then add the relocation at the end of the table */ nxflat_relocs[nxflat_nrelocs-1].r_info = NXFLAT_RELOC(reloc_type, relp->address + got_size); vdbg("relocs[%d]: type: %d offset: %08x\n", nxflat_nrelocs-1, NXFLAT_RELOC_TYPE(nxflat_relocs[nxflat_nrelocs-1].r_info), NXFLAT_RELOC_OFFSET(nxflat_relocs[nxflat_nrelocs-1].r_info)); } } /*********************************************************************** * resolve_segment_relocs ***********************************************************************/ static void resolve_segment_relocs(bfd *input_bfd, segment_info *inf, asymbol **syms) { arelent **relpp; int relsize; int relcount; int i; int j; for (i = 0; i < inf->nsubsects; i++) { relcount = inf->subsect[i]->reloc_count; vdbg("Section %s has %08x relocs\n", inf->subsect[i]->name, relcount); if (0 >= relcount) { continue; } relsize = bfd_get_reloc_upper_bound(input_bfd, inf->subsect[i]); vdbg("Section %s reloc size: %08x\n", inf->subsect[i]->name, relsize); if (0 >= relsize) { continue; } relpp = (arelent**)malloc((size_t) relsize); relcount = bfd_canonicalize_reloc(input_bfd, inf->subsect[i], relpp, syms); if (relcount < 0) { err("bfd_canonicalize_reloc failed!\n"); exit(1); } vdbg("Section %s can'd %08x relocs\n", inf->subsect[i]->name, relcount); for (j = 0; j < relcount; j++) { /* Get information about this symbol */ reloc_howto_type *how_to = relpp[j]->howto; asymbol *rel_sym = *relpp[j]->sym_ptr_ptr; asection *rel_section = rel_sym->section; int32_t *target = (int32_t*)(inf->contents + relpp[j]->address); symvalue sym_value; /* If the symbol is a thumb function, then set bit 1 of the value */ sym_value = rel_sym->value; #ifdef NXFLAT_THUMB2 if ((((elf_symbol_type *)rel_sym)->internal_elf_sym.st_info & 0x0f) == STT_ARM_TFUNC) { sym_value |= 1; } else #endif /* If the symbol lies in D-Space, then we need to add the size of the GOT * table to the symbol value */ if ((rel_section->flags & SEC_CODE) == 0 && (rel_section->flags & SEC_ALLOC) != 0) { sym_value += got_size; } dbg("rel %-3d: sym [%20s] s_addr @ %08lx val %08lx-%08lx rel %08lx how %s\n", j, rel_sym->name, (long)relpp[j]->address, (long)rel_sym->value, (long)sym_value, (long)relpp[j]->addend, how_to->name); switch (how_to->type) { case R_ARM_PLT32: case R_ARM_PC24: { int32_t temp; int32_t saved; dbg("performing PC24 link at addr %08lx [%08lx] to sym '%s' [%08lx]\n", (long)relpp[j]->address, (long)*target, rel_sym->name, (long)sym_value); /* Can't fix what we ain't got */ if ((SEC_IN_MEMORY & rel_section->flags) == 0) { err("Section %s not loaded into mem!\n", rel_section->name); exit(1); } /* PC24 -> can only fix text to text refs */ if ((SEC_CODE & rel_section->flags) == 0) { err("Section %s not code!\n", rel_section->name); exit(1); } if ((SEC_CODE & inf->subsect[i]->flags) == 0) { err("Section %s not code!\n", rel_section->name); exit(1); } if (verbose > 1) { vdbg(" Original opcode @ %p is %08lx ", #ifdef ARCH_BIG_ENDIAN target, (long)nxflat_swap32(*target)); #else target, (long)*target); #endif if (verbose > 2) { printf("rsh %d ", how_to->rightshift); printf(" sz %d ", how_to->size); printf("bit %d ", how_to->bitsize); printf("rel %d ", how_to->pc_relative); printf("smask %08lx ", (long)how_to->src_mask); printf("dmask %08lx ", (long)how_to->dst_mask); printf("off %d ", how_to->pcrel_offset); } printf("\n"); } if (how_to->pcrel_offset) { #ifdef ARCH_BIG_ENDIAN saved = temp = (int32_t)nxflat_swap32(*target); #else saved = temp = *target; #endif /* mask */ temp &= how_to->src_mask; /* sign extend */ temp <<= (32 - how_to->bitsize); temp >>= (32 - how_to->bitsize); /* offset */ temp += ((sym_value + rel_section->vma) - relpp[j]->address) >> how_to->rightshift; /* demote */ /* temp >>= how_to->rightshift; */ /* mask upper bits from rollover */ temp &= how_to->dst_mask; /* replace data that was masked */ temp |= saved & (~how_to->dst_mask); } else { err("Do not know how pcrel_offset\n"); exit(1); } vdbg(" Modified opcode: %08lx\n", (long)temp); #ifdef ARCH_BIG_ENDIAN *target = (long)nxflat_swap32(temp); #else *target = (long)temp; #endif } break; case R_ARM_ABS32: { dbg("Performing ABS32 link at addr %08lx [%08lx] to sym '%s' [%08lx]\n", (long)relpp[j]->address, (long)*target, rel_sym->name, (long)sym_value); relocate_abs32(relpp[j], target, sym_value); } break; case R_ARM_REL32: { dbg("Performing REL32 link at addr %08lx [%08lx] to sym '%s' [%08lx]\n", (long)relpp[j]->address, (long)*target, rel_sym->name, (long)sym_value); /* The only valid REL32 relocation would be to relocate a reference from * I-Space to another symbol in I-Space. That should be handled by the * partially linking logic so we don't expect to see any R_ARM_REL32 * relocations here. */ switch (get_reloc_type(rel_section, NULL)) { case NXFLAT_RELOC_TARGET_UNKNOWN: default: { err("Symbol relocation section type is unknown\n"); nerrors++; } break; case NXFLAT_RELOC_TARGET_BSS: case NXFLAT_RELOC_TARGET_DATA: { err("Cannot perform REL32 relocation: Symbol '%s' lies in D-Space\n", rel_sym->name); nerrors++; } break; case NXFLAT_RELOC_TARGET_TEXT: { vdbg("Symbol '%s' lies in I-Space\n", rel_sym->name); relocate_rel32(relpp[j], target, sym_value - relpp[j]->address); } break; } } break; #ifdef NXFLAT_THUMB2 case R_ARM_THM_XPC22: case R_ARM_THM_CALL: case R_ARM_THM_JUMP24: /* Thumb BL (branch long instruction). */ { u_int16_t *pinsn = (u_int16_t*)target; u_int16_t upper_insn = pinsn[0]; u_int16_t lower_insn = pinsn[1]; /* Fetch the addend. We use the Thumb-2 encoding (backwards * compatible with Thumb-1) involving the J1 and J2 bits */ int32_t s = (upper_insn & (1 << 10)) >> 10; int32_t upper = upper_insn & 0x3ff; int32_t lower = lower_insn & 0x7ff; int32_t j1 = (lower_insn & (1 << 13)) >> 13; int32_t j2 = (lower_insn & (1 << 11)) >> 11; int32_t i1 = j1 ^ s ? 0 : 1; int32_t i2 = j2 ^ s ? 0 : 1; int32_t temp; int32_t signbit; temp = (i1 << 23) | (i2 << 22) | (upper << 12) | (lower << 1); /* Sign extend */ temp = (temp | ((s ? 0 : 1) << 24)) - (1 << 24); dbg("Performing THM link at addr %08lx [%04x %04x] to sym '%s' [%08lx]\n", (long)relpp[j]->address, upper_insn, lower_insn, rel_sym->name, (long)sym_value); vdbg(" Original INSN: %04x %04x temp: %08lx\n", upper_insn, lower_insn, (long)temp); /* Add the branch offset (really needs a range check) */ temp += (sym_value + rel_section->vma - relpp[j]->address); if ((lower_insn & 0x5000) == 0x4000) { /* For a BLX instruction, make sure that the relocation is rounded up * to a word boundary. This follows the semantics of the instruction * which specifies that bit 1 of the target address will come from bit * 1 of the base address. */ temp = (temp + 2) & ~ 3; } /* Put RELOCATION back into the insn. Assumes two's complement. * We use the Thumb-2 encoding, which is safe even if dealing with * a Thumb-1 instruction by virtue of our overflow check above. */ signbit = (temp < 0) ? 1 : 0; upper_insn = (upper_insn & ~0x7ff) | ((temp >> 12) & 0x3ff) | (signbit << 10); lower_insn = (lower_insn & ~0x2fff) | (((!((temp >> 23) & 1)) ^ signbit) << 13) | (((!((temp >> 22) & 1)) ^ signbit) << 11) | ((temp >> 1) & 0x7ff); vdbg(" Modified INSN: %04x %04x temp: %08lx Sec VMA: %08lx\n", upper_insn, lower_insn, (long)temp, (long)rel_section->vma); /* Put the relocated value back in the object file: */ pinsn[0] = upper_insn; pinsn[1] = lower_insn; } break; #endif case R_ARM_GOTOFF: { int reltype; /* Relocation is relative to the start of the global offset * table. This is used for things link known offsets to * constant strings in D-Space. I think we can just ignore * this relocation. The usual assembly language sequence * is like: * * ldr r0, .L9 <- r0 holds GOT-relative offset to 'n' * add r0, sl, r0 <- Adding SL produces address of 'n' * ... * .L9: * .word n(GOTOFF) */ dbg("Perfoming GOTOFF reloc at addr %08lx [%08lx] to sym '%s' [%08lx]\n", (long)relpp[j]->address, (long)*target, rel_sym->name, (long)sym_value); /* For this location, we need to set the value to the value * of the symbol in D-Space. (There is obviously a problem if * the symbol lies in I-Space because the offset is not relative * to the PIC address which points to the GOT). */ /* Check if symbols lies in I- or D-Space */ reltype = get_reloc_type(rel_section, NULL); if (reltype == NXFLAT_RELOC_TARGET_TEXT) { err("Symbol in GOT32 relocation is in TEXT\n"); err(" At addr %08lx to sym '%s' [%08lx]\n", (long)relpp[j]->address, rel_sym->name, (long)sym_value); } else { vdbg(" Original value: %08lx\n", (long)*target); *target = sym_value; vdbg(" Modified value: %08lx\n", (long)*target); } } break; case R_ARM_GOT32: case R_ARM_GOT_PREL: { struct nxflat_got_s *got_entry; /* Relocation is to the entry for this symbol in the global * offset table. This relocation type is used to set the 32-bit * address of global variables. The usual assembly language sequence * is like: * * ldr r3, .L4 <- r3 holds GOT-relative offset to address of 'n' * ldr r1, [sl,r3] <- r1 holds (relocated) address of 'n' * ... * .L4: * .word n(GOT) */ dbg("Performing GOT32 reloc at addr %08lx [%08lx] to sym '%s' [%08lx]\n", (long)relpp[j]->address, (long)*target, rel_sym->name, (long)sym_value); /* There should be an entry for the relocation allocated in the GOT */ got_entry = find_got_entry(rel_sym); if (!got_entry) { err("No GOT entry from for symobl '%s'\n", rel_sym->name); nerrors++; } else { /* The fixup is simply to provide the GOT offset as the relocation value */ vdbg(" Original value: %08lx\n", (long)*target); *target = got_entry->offset; vdbg(" Modified value: %08lx\n", (long)*target); } } break; case R_ARM_GOTPC: { /* Use the global offset table as a symbol value */ dbg("Performing GOTPC reloc at addr %08lx [%08lx] to sym '%s' [%08lx]\n", (long)relpp[j]->address, (long)*target, rel_sym->name, (long)sym_value); /* Check if this is TEXT section relocation */ if ((inf->subsect[i]->flags & SEC_CODE) != 0 && (inf->subsect[i]->flags & SEC_ALLOC) != 0) { /* The GOT always begins at offset 0 */ vdbg(" Original value: %08lx\n", (long)*target); *target = 0; vdbg(" Modified value: %08lx\n", (long)*target); } else { err("Attempted GOTPC relocation in outside of I-Space section\n"); err(" At addr %08lx [%08lx] to sym '%s' [%08lx]\n", (long)relpp[j]->address, (long)*target, rel_sym->name, (long)sym_value); nerrors++; } } break; default: err("Do not know how to handle reloc %d type %s @ %p!\n", how_to->type, how_to->name, how_to); nerrors++; break; } } /* Mark the section as having no relocs */ inf->subsect[i]->flags &= !(SEC_RELOC); inf->subsect[i]->reloc_count = 0; free(relpp); } } /*********************************************************************** * allocate_segment_got ***********************************************************************/ /* The GOT lies at the beginning of D-Space. Before we can process * any relocation data, we need to determine the size of the GOT. */ static void allocate_segment_got(bfd *input_bfd, segment_info *inf, asymbol **syms) { arelent **relpp; int relsize; int relcount; int i; int j; for (i = 0; i < inf->nsubsects; i++) { relcount = inf->subsect[i]->reloc_count; vdbg("Section %s has %08x relocs\n", inf->subsect[i]->name, relcount); if (0 >= relcount) { continue; } relsize = bfd_get_reloc_upper_bound(input_bfd, inf->subsect[i]); vdbg("Section %s reloc size: %08x\n", inf->subsect[i]->name, relsize); if (0 >= relsize) { continue; } relpp = (arelent**)malloc((size_t) relsize); relcount = bfd_canonicalize_reloc(input_bfd, inf->subsect[i], relpp, syms); if (relcount < 0) { err("bfd_canonicalize_reloc failed!\n"); exit(1); } vdbg("Section %s can'd %08x relocs\n", inf->subsect[i]->name, relcount); for (j = 0; j < relcount; j++) { /* Get information about this symbol */ reloc_howto_type *how_to = relpp[j]->howto; asymbol *rel_sym = *relpp[j]->sym_ptr_ptr; dbg("rel %-3d: sym [%20s] s_addr @ %08lx rel %08lx how %s\n", j, rel_sym->name, (long)relpp[j]->address, (long)relpp[j]->addend, how_to->name); switch (how_to->type) { case R_ARM_GOT32: case R_ARM_GOT_PREL: /* This symbol requires a global offset table entry. */ { alloc_got_entry(rel_sym); dbg(" Created GOT entry %d for sym %p (offset %d)\n", ngot_offsets-1, got_offsets[ngot_offsets-1].sym, got_offsets[ngot_offsets-1].offset); } break; case R_ARM_GOTOFF32: case R_ARM_GOTPC: /* These are relative to the GOT, but do not require GOT entries */ break; default: break; } } free(relpp); } } /*********************************************************************** * dump_symbol ***********************************************************************/ static void dump_symbol(asymbol * psym) { struct elf_internal_sym *isym = (struct elf_internal_sym *)&((elf_symbol_type *)psym)->internal_elf_sym; if (bfd_is_com_section(psym->section)) { /* Common Global - unplaced */ printf("Sym[%24s] @ sz %04lx ", psym->name, (long)psym->value); printf("align %04x ", (u_int32_t)isym->st_value); } else { printf("Sym[%24s] @ %04lx align ", psym->name, (long)psym->value); printf("sz %04x ", (u_int32_t)isym->st_size); } /* Symbol type */ printf("tp %02x ", isym->st_info); /* Tag thumb specific attributes */ #ifdef NXFLAT_THUMB2 if ((isym->st_info & 0x0f) == STT_ARM_TFUNC || (isym->st_info & 0x0f) == STT_ARM_16BIT) { putchar('T'); } else { putchar(' '); } #endif /* Common attributes */ printf("|%c", psym->flags & BSF_OBJECT ? 'O' : '.'); printf("%c", psym->flags & BSF_DYNAMIC ? 'D' : '.'); printf("%c", psym->flags & BSF_FILE ? 'F' : '.'); printf("%c", psym->flags & BSF_INDIRECT ? 'I' : '.'); printf("%c", psym->flags & BSF_WARNING ? 'W' : '.'); printf("%c", psym->flags & BSF_CONSTRUCTOR ? 'C' : '.'); printf("%c", psym->flags & BSF_NOT_AT_END ? 'N' : '.'); printf("%c", psym->flags & BSF_OLD_COMMON ? 'c' : '.'); printf("%c", psym->flags & BSF_SECTION_SYM ? 'S' : '.'); printf("%c", psym->flags & BSF_WEAK ? 'w' : '.'); printf("%c", psym->flags & BSF_KEEP_G ? 'G' : '.'); printf("%c", psym->flags & BSF_KEEP ? 'K' : '.'); printf("%c", psym->flags & BSF_FUNCTION ? 'f' : '.'); printf("%c", psym->flags & BSF_DEBUGGING ? 'd' : '.'); printf("%c", psym->flags & BSF_GLOBAL ? 'g' : '.'); printf("%c|", psym->flags & BSF_LOCAL ? 'l' : '.'); printf("\n"); } /*********************************************************************** * check_symbol_overlap ***********************************************************************/ static void check_symbol_overlap(asymbol ** symbols, int number_of_symbols) { int i; int j; for (i = 0; i < number_of_symbols; i++) { elf_symbol_type *sym_i; bfd_vma base_i; bfd_vma top_i; bfd_vma size_i; sym_i = (elf_symbol_type *) symbols[i]; base_i = sym_i->symbol.section->vma + sym_i->internal_elf_sym.st_value; size_i = sym_i->internal_elf_sym.st_size; if (0 == size_i) { if (sym_i->symbol.section->flags & SEC_CODE) { /* must be an internal branch - ignore */ vdbg("Sym [%20s] is zero len, skipping!\n", sym_i->symbol.name); continue; } else { /* pointer - fake size up */ size_i = 4; } } top_i = base_i + size_i; dbg("Sym [%20s] base %08lx, top %08lx\n", sym_i->symbol.name, (long)base_i, (long)top_i); for (j = (i + 1); j < number_of_symbols; j++) { elf_symbol_type *sym_j; bfd_vma base_j; bfd_vma top_j; bfd_vma size_j = 0; sym_j = (elf_symbol_type *) symbols[j]; base_j = sym_j->symbol.section->vma + sym_j->internal_elf_sym.st_value; if (0 == size_j) { if (sym_j->symbol.section->flags & SEC_CODE) { /* must be an internal branch - ignore */ continue; } else { /* pointer - fake size up */ size_j = 4; } } top_j = base_j + sym_j->internal_elf_sym.st_size; if (0 == sym_j->internal_elf_sym.st_size) { continue; } if ((base_j < top_i) && (top_j > base_i)) { /* symbols overlap - bad bad bad bad */ if (verbose) { warn("Symbols '%s'[%6s] and '%s'[%6s] OVERLAP!\n", sym_i->symbol.name, sym_i->symbol.section->name, sym_j->symbol.name, sym_j->symbol.section->name); warn(" Sym '%s' base %08lx, top %08lx\n", sym_i->symbol.name, (long)base_i, (long)top_i); warn(" Sym '%s' base %08lx, top %08lx\n", sym_j->symbol.name, (long)base_j, (long)top_j); } } } } } /*********************************************************************** * map_common_symbols ***********************************************************************/ static void map_common_symbols(bfd * input_bfd, asymbol ** symbols, int number_of_symbols) { asection *bss_s; int i; int j; bfd_vma baseaddr; bfd_vma align; bfd_vma size; bfd_vma symbase; bfd_vma offset; bss_s = bss_info.subsect[0]; baseaddr = 0; vdbg("Before map high mark %08lx cooked %08lx raw %08lx \n", (long)bss_info.high_mark, (long)bss_info.subsect[0]->COOKED_SIZE, (long)bss_info.subsect[0]->RAW_SIZE); vdbg("Checking overlap before mapping\n"); check_symbol_overlap(symbols, number_of_symbols); vdbg("Mapping COMMONS\n"); if (NULL == bss_s) { warn("NULL section passed to map_common_symbols\n"); return; } vdbg("Assigning COMMON symbols to section %s\n", bss_s->name); for (i = 0; i < number_of_symbols; i++) { if (bfd_is_com_section(symbols[i]->section)) { if (verbose) { message("COMMON sym[%04d] ", i); dump_symbol(symbols[i]); } /* get parameters of unmapped symbol */ #if 0 align = ((elf_symbol_type *) symbols[i])->internal_elf_sym.st_value; #else /* Ignore alignment - just make sure we're word aligned we're not * worrying about page boundaries since we're flat mem and we're not * really concerned with cache alignment - maybe someday */ align = 0x04; #endif size = ((elf_symbol_type *) symbols[i])->internal_elf_sym.st_size; if (0 == size) { dbg("Aero size symbol assumed to be a ptr size 4\n"); size = 0x04; } if (size % 0x04) { dbg("non-mod4 symbol rounded up 4\n"); size = ((size >> 2) + 1) << 2; } /* INSERT SYMBOL AT END OF BSS - MUCH MO BETTA */ /* calulate transaction effects - insert blank b4 sym to get align */ baseaddr = bss_s->COOKED_SIZE; symbase = ((baseaddr + align - 1) / align) * align; offset = (symbase + size) - baseaddr; vdbg(" ba: %08lx sb: %08lx al: %04lx sz: %04lx of: %04lx\n", (long)baseaddr, (long)symbase, (long)align, (long)size, (long)offset); /* Add space to bss segment and section */ bss_info.high_mark += offset; bss_info.size += offset; bss_s->COOKED_SIZE += offset; bss_s->RAW_SIZE += offset; /* find all end markers and offset */ for (j = 0; j < number_of_symbols; j++) { if (bss_s == symbols[j]->section) { if (verbose) { message("Checking endsym? %08lx sym[%04d] ", (long)baseaddr, j); dump_symbol(symbols[j]); } if (symbols[j]->value >= baseaddr) { symbols[j]->value += offset; ((elf_symbol_type *) symbols[j])->internal_elf_sym. st_value += offset; if (verbose > 1) { message("Sym MOVED to sym[%04d] ", j); dump_symbol(symbols[j]); } } } } /* stuff sym at base */ symbols[i]->section = bss_s; symbols[i]->value = symbase; symbols[i]->flags = BSF_OBJECT | BSF_GLOBAL; ((elf_symbol_type *) symbols[i])->internal_elf_sym.st_value = symbase; if (verbose) { message("NEW sym[%04d] ", i); dump_symbol(symbols[i]); } } } check_symbol_overlap(symbols, number_of_symbols); vdbg("After map high mark %08lx cooked %08lx raw %08lx \n", (long)bss_info.high_mark, (long)bss_info.subsect[0]->COOKED_SIZE, (long)bss_info.subsect[0]->RAW_SIZE); } /*********************************************************************** * resolve_relocs ***********************************************************************/ static void resolve_relocs(bfd *input_bfd, asymbol **symbols) { resolve_segment_relocs(input_bfd, &text_info, symbols); resolve_segment_relocs(input_bfd, &data_info, symbols); resolve_segment_relocs(input_bfd, &bss_info, symbols); } /*********************************************************************** * allocate_got ***********************************************************************/ /* The GOT lies at the beginning of D-Space. Before we can process * any relocation data, we need to determine the size of the GOT. */ static void allocate_got(bfd *input_bfd, asymbol **symbols) { allocate_segment_got(input_bfd, &text_info, symbols); allocate_segment_got(input_bfd, &data_info, symbols); allocate_segment_got(input_bfd, &bss_info, symbols); } /*********************************************************************** * output_got ***********************************************************************/ /* Pull the sections that make up this segment in off disk */ static void output_got(int fd) { struct nxflat_reloc_s *relocs; u_int32_t *got; int reloc_size; int reloc_type; int nrelocs; int i; int j; if (ngot_offsets > 0) { /* Allocate memory for the GOT */ got = (u_int32_t*)malloc(got_size); if (!got) { err("Failed to allocate memory for the GOT (%d bytes, %d offsets)\n", got_size, ngot_offsets); exit(1); } /* Re-allocate memory for the relocations to include the GOT relocations */ nrelocs = ngot_offsets + nxflat_nrelocs; reloc_size = sizeof(struct nxflat_reloc_s) * nrelocs; relocs = (struct nxflat_reloc_s*)realloc(nxflat_relocs, reloc_size); if (!relocs) { err("Failed to re-allocate memory for the GOT relocations (%d bytes, %d relocations)\n", reloc_size, nrelocs); exit(1); } /* Then initialize the GOT contents with the value associated with each symbol */ for (i = 0; i < ngot_offsets; i++) { asymbol *rel_sym = got_offsets[i].sym; asection *rel_section = rel_sym->section; symvalue sym_value = rel_sym->value; /* j is the offset index into the relocatino table */ j = i + nxflat_nrelocs; /* If the symbol is a thumb function, then set bit 1 of the value */ #ifdef NXFLAT_THUMB2 if ((((elf_symbol_type *)rel_sym)->internal_elf_sym.st_info & 0x0f) == STT_ARM_TFUNC) { sym_value |= 1; } #endif /* Determine where the symbol lies */ switch (get_reloc_type(rel_section, NULL)) { /* If the symbol lies in D-Space, then we need to add the size of the GOT * table to the symbol value */ case NXFLAT_RELOC_TARGET_BSS: case NXFLAT_RELOC_TARGET_DATA: { vdbg("Symbol '%s' lies in D-Space\n", rel_sym->name); reloc_type = NXFLAT_RELOC_TYPE_REL32D; sym_value += got_size; } break; /* If the symbol lies in I-Space */ case NXFLAT_RELOC_TARGET_TEXT: { vdbg("Symbol '%s' lies in I-Space\n", rel_sym->name); reloc_type = NXFLAT_RELOC_TYPE_REL32I; } break; case NXFLAT_RELOC_TARGET_UNKNOWN: default: { err("Relocation type is unknown\n"); nerrors++; continue; } } /* Then save the symbol offset in the got */ got[i] = sym_value; vdbg("GOT[%d]: sym name: '%s' value: %08lx->%08lx\n", i, rel_sym->name, (long)rel_sym->value, (long)sym_value); /* And output the relocation information associate with the GOT entry */ relocs[j].r_info = NXFLAT_RELOC(reloc_type, sizeof(u_int32_t) * i); vdbg("relocs[%d]: type: %d offset: %08x\n", j, NXFLAT_RELOC_TYPE(relocs[j].r_info), NXFLAT_RELOC_OFFSET(relocs[j].r_info)); } /* Write the GOT on the provided file descriptor */ if (verbose > 1) { printf("GOT:\n"); for (i = 0; i < ngot_offsets; i++) { printf(" Offset %-3ld: %08x\n", (long)(sizeof(u_int32_t) * i), got[i]); } printf("Relocations:\n"); for (i = 0; i < nrelocs; i++) { printf(" Offset %-3ld: %08x\n", (long)(sizeof(struct nxflat_reloc_s) * i), relocs[i].r_info); } } nxflat_write(fd, (const char *)got, got_size); free(got); /* Return the relocation table (via global variables) */ nxflat_relocs = relocs; nxflat_nrelocs = nrelocs; } } /*********************************************************************** * is_unwanted_section ***********************************************************************/ /* Return 1 if this is a section that we want to throw away but can only * identify by name. Normally, any section with appropriate-looking flags * will get copied into the output file. */ static int is_unwanted_section(asection * s) { if (!strcmp(s->name, ".hash")) return 1; if (!strcmp(s->name, ".dynstr") || !strcmp(s->name, ".dynsym")) return 1; if (s->flags & SEC_DEBUGGING) return 1; return 0; } /*********************************************************************** * register_section ***********************************************************************/ /* Mark this section for inclusion in some segment. */ static void register_section(asection * s, segment_info * inf) { vdbg("registering section %s to %s segment\n", s->name, inf->name); inf->subsect[inf->nsubsects++] = s; } /*********************************************************************** * dump_sections ***********************************************************************/ /* Print out the sections that make up this segment for debugging. */ static void dump_sections(segment_info * inf) { int i; printf(" [ "); for (i = 0; i < inf->nsubsects; i++) { printf("%s ", inf->subsect[i]->name); } printf("]\n"); } /*********************************************************************** * load_sections ***********************************************************************/ /* Pull the sections that make up this segment in off disk */ static void load_sections(bfd *bfd, segment_info *inf) { void *ptr; int i; if (inf->size > 0) { inf->contents = malloc(inf->size); if (!inf->contents) { err("Failed to allocate memory for section contents.\n"); exit(1); } ptr = inf->contents; for (i = 0; i < inf->nsubsects; i++) { if (!bfd_get_section_contents(bfd, inf->subsect[i], ptr, 0, inf->subsect[i]->COOKED_SIZE)) { err("Failed to read section contents.\n"); exit(1); } ptr += inf->subsect[i]->COOKED_SIZE; inf->subsect[i]->flags |= SEC_IN_MEMORY; } } } /*********************************************************************** * stack_nxflat_segment ***********************************************************************/ static void stack_nxflat_segment(segment_info * inf) { bfd_vma min_addr = 0x7fffffff; bfd_vma max_addr = 0x00000000; int i; for (i = 0; i < inf->nsubsects; i++) { bfd_vma vma = inf->subsect[i]->vma; if (vma < min_addr) min_addr = vma; vma += inf->subsect[i]->COOKED_SIZE; if (vma > max_addr) max_addr = vma; } inf->low_mark = min_addr; inf->high_mark = max_addr; inf->size = max_addr - min_addr; } /*********************************************************************** * show_usage ***********************************************************************/ static void show_usage(void) { fprintf(stderr, "Usage: %s [options] \n\n", program_name); fprintf(stderr, "Where options are one or more of the following. Note\n"); fprintf(stderr, "that a space is always required between the option and\n"); fprintf(stderr, "any following arguments.\n\n"); fprintf(stderr, " -d Use dynamic symbol table [Default: symtab]\n"); fprintf(stderr, " -e \n"); fprintf(stderr, " Entry point to module [Default: %s]\n", default_exe_entry_name); fprintf(stderr, " -o \n"); fprintf(stderr, " Output to [Default: .nxf]\n"); fprintf(stderr, " -s \n"); fprintf(stderr, " Set stack size to [Default: %d]\n", DEFAULT_STACK_SIZE); fprintf(stderr, " -v Verbose outpu.t If -v is applied twice, additional\n"); fprintf(stderr, " debug output is enabled [Default: no verbose output].\n"); fprintf(stderr, "\n"); exit(2); } /*********************************************************************** * parse_args ***********************************************************************/ static void parse_args(int argc, char **argv) { int opt; /* Save our name (for show_usage) */ program_name = argv[0]; /* Set some default values */ stack_size = 0; entry_name = NULL; if (argc < 2) { err("Missing required arguments\n\n"); show_usage(); } /* Get miscellaneous options from the command line. */ while ((opt = getopt(argc, argv, "de:lo:s:v")) != -1) { switch (opt) { case 'd': dsyms++; break; case 'e': entry_name = strdup(optarg); break; case 'o': out_filename = optarg; break; case 's': stack_size = atoi(optarg); break; case 'v': verbose++; break; case 'l': default: err("%s Unknown option\n\n", argv[0]); show_usage(); break; } } /* The very last thing is also the name of the BFD input file */ bfd_filename = argv[argc - 1]; /* Verify that an appropriate stack size is selected. */ if (stack_size == 0) { /* Executables must have a stack_size selected. */ printf("Using default stack size: %d\n", DEFAULT_STACK_SIZE); stack_size = DEFAULT_STACK_SIZE; } if (entry_name == NULL) { printf("Using entry_point: %s\n", default_exe_entry_name); entry_name = default_exe_entry_name; } } /*********************************************************************** * Public Functions ***********************************************************************/ /*********************************************************************** * main ***********************************************************************/ int main(int argc, char **argv, char **envp) { struct nxflat_hdr_s hdr; bfd *bf; asection *s; asymbol **symbol_table; int32_t number_of_symbols; u_int32_t offset; int fd; int i; /* Parse the incoming command line */ parse_args(argc, argv); /* Open the BFD input file */ if (!(bf = bfd_openr(argv[argc - 1], 0))) { err("Failed to open %s\n", argv[argc - 1]); exit(1); } /* Verify the format of the BFD file */ if (bfd_check_format(bf, bfd_object) == 0) { err("File is not an object file\n"); exit(2); } /* Read the symbol table from the file */ symbol_table = get_symbols(bf, &number_of_symbols); /* Find all of the special symbols that we will need in the symbol table that * we just read. */ find_special_symbols(); /* Walk the list of sections, figuring out where each one goes and how much * storage it requires. */ text_info.low_mark = data_info.low_mark = bss_info.low_mark = -1; text_info.high_mark = data_info.high_mark = bss_info.high_mark = 0; text_info.contents = data_info.contents = bss_info.contents = NULL; text_info.size = data_info.size = bss_info.size = 0; text_info.nsubsects = data_info.nsubsects = bss_info.nsubsects = 0; text_info.name = "text"; data_info.name = "data"; bss_info.name = "bss"; for (s = bf->sections; s != NULL; s = s->next) { dbg("Reading section %s\n", s->name); /* ignore blatantly useless sections */ if (!is_unwanted_section(s)) { if (s->flags == SEC_ALLOC) { vdbg(" Section %s is ALLOC only\n", s->name); register_section(s, &bss_info); } else if ((s->flags & SEC_CODE) != 0 && (s->flags & SEC_ALLOC) != 0) { vdbg(" Section %s is CODE\n", s->name); register_section(s, &text_info); } else if ((s->flags & SEC_DATA) != 0 && (s->flags & SEC_ALLOC) != 0) { vdbg(" Section %s is DATA\n", s->name); register_section(s, &data_info); } else { vdbg("WARNING: ignoring section %s\n", s->name); } } } /* Fixup high and low water VMA address */ stack_nxflat_segment(&text_info); stack_nxflat_segment(&data_info); stack_nxflat_segment(&bss_info); /* Check for a data offset due to the presence of a GOT */ printf("INPUT SECTIONS:\n"); printf("SECT LOW HIGH SIZE\n"); if (text_info.nsubsects == 0) { warn("TEXT Not found Not found ( Not found )\n"); } else { printf("TEXT %08lx %08lx %08lx\n", (long)text_info.low_mark, (long)text_info.high_mark, (long)text_info.size); if (text_info.low_mark != 0) { err("Text section must be origined at zero"); exit(1); } } if (data_info.nsubsects == 0) { warn("DATA Not found Not found ( Not found )\n"); } else { printf("DATA %08lx %08lx %08lx\n", (long)data_info.low_mark, (long)data_info.high_mark, (long)data_info.size); if (data_info.low_mark != 0) { err("data section must be origined at zero"); exit(1); } } if (bss_info.nsubsects == 0) { warn("BSS Not found Not found ( Not found )\n"); } else { printf("BSS %08lx %08lx %08lx\n", (long)bss_info.low_mark, (long)bss_info.high_mark, (long)bss_info.size); /* If data is present, then BSS was be origined immediately after the * data. */ if (data_info.nsubsects > 0) { /* There is data... Account for possible ALIGN 0x10 at end of data */ u_int32_t bss_start1 = data_info.high_mark; u_int32_t bss_start2 = ((bss_start1 + 0x0f) & ~0x0f); if ((bss_info.low_mark < bss_start1) && (bss_info.low_mark > bss_start2)) { err("BSS must be origined immediately after the data section\n"); exit(1); } } /* If there is no data, then the BSS must be origined at zero */ else if (bss_info.low_mark != 0) { err("BSS section (with no data section) must be origined at zero\n"); exit(1); } } if (verbose) { message("TEXT: "); dump_sections(&text_info); message("DATA: "); dump_sections(&data_info); message("BSS: "); dump_sections(&bss_info); } /* Slurp the section contents in. No need to load BSS since we know it * isn't initialised. */ load_sections(bf, &text_info); load_sections(bf, &data_info); /* Unmapped 'common' symbols need to be stuffed into bss */ map_common_symbols(bf, symbol_table, number_of_symbols); /* Dump symbol information */ if (verbose) { for (i = 0; i < number_of_symbols; i++) { message("sym[%04d] ", i); dump_symbol(symbol_table[i]); } } /* The GOT lies at the beginning of D-Space. Before we can process * any relocation data, we need to determine the size of the GOT. */ allocate_got(bf, symbol_table); /* Then process all of the relocations */ resolve_relocs(bf, symbol_table); /* Fill in the NXFLAT file header */ memcpy(hdr.h_magic, NXFLAT_MAGIC, 4); offset = NXFLAT_HDR_SIZE + text_info.size; put_xflat32(&hdr.h_datastart, offset); offset += got_size + data_info.size; put_xflat32(&hdr.h_dataend, offset); put_xflat32(&hdr.h_relocstart, offset); offset += bss_info.size; put_xflat32(&hdr.h_bssend, offset); put_xflat32(&hdr.h_stacksize, stack_size); put_xflat16(&hdr.h_reloccount, nxflat_nrelocs + ngot_offsets); put_entry_point(&hdr); put_special_symbol(dynimport_begin_symbol, dynimport_end_symbol, &hdr.h_importsymbols, &hdr.h_importcount, sizeof(struct nxflat_import_s), text_info.size + got_size); /* Open the output file */ if (!out_filename) { out_filename = malloc(strlen(bfd_filename) + 5); /* 5 to add suffix */ strcpy(out_filename, bfd_filename); strcat(out_filename, ".nxf"); } fd = open(out_filename, O_WRONLY | O_PLATFORM | O_CREAT | O_TRUNC, 0744); if (fd < 0) { err("Failed open output file %s: %s\n", out_filename, strerror(errno)); exit(4); } /* Write the data in the following order in order to match the NXFLAT header * offsets: HDR, ISPACE, GOT, DSPACE, RELOCS. */ nxflat_write(fd, (const char *)&hdr, NXFLAT_HDR_SIZE); nxflat_write(fd, (const char *)text_info.contents, text_info.size); if (ngot_offsets > 0) { output_got(fd); } nxflat_write(fd, (const char *)data_info.contents, data_info.size); if (nxflat_relocs) { vdbg("Number of GOT relocations: %d\n", ngot_offsets); #ifdef RELOCS_IN_NETWORK_ORDER for (i = 0; i < nxflat_nrelocs; i++) { nxflat_relocs[i] = htonl(nxflat_relocs[i]); } #endif nxflat_write(fd, (const char *)nxflat_relocs, sizeof(struct nxflat_reloc_s) * nxflat_nrelocs); } /* Finished! */ close(fd); if (nerrors > 0) { fprintf(stderr, "%d Errors detected\n", nerrors); return 1; } return 0; }