/* ----------------------------------------------------------------------- * * * Copyright 1996-2013 The NASM Authors - All Rights Reserved * See the file AUTHORS included with the NASM distribution for * the specific copyright holders. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following * conditions are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * ----------------------------------------------------------------------- */ /* * outelfx32.c output routines for the Netwide Assembler to produce * ELF32 (x86_64) object file format */ #include "compiler.h" #include #include #include #include #include #include "nasm.h" #include "nasmlib.h" #include "saa.h" #include "raa.h" #include "stdscan.h" #include "eval.h" #include "output/outform.h" #include "output/outlib.h" #include "rbtree.h" #include "output/dwarf.h" #include "output/stabs.h" #include "output/outelf.h" #ifdef OF_ELFX32 #define SECT_DELTA 32 static struct elf_section **sects; static int nsects, sectlen; #define SHSTR_DELTA 256 static char *shstrtab; static int shstrtablen, shstrtabsize; static struct SAA *syms; static uint32_t nlocals, nglobs, ndebugs; /* Symbol counts */ static int32_t def_seg; static struct RAA *bsym; static struct SAA *strs; static uint32_t strslen; static struct elf_symbol *fwds; static char elf_module[FILENAME_MAX]; extern struct ofmt of_elfx32; static struct ELF_SECTDATA { void *data; int32_t len; bool is_saa; } *elf_sects; static int elf_nsect, nsections; static int32_t elf_foffs; static void elf_write(void); static void elf_sect_write(struct elf_section *, const void *, size_t); static void elf_sect_writeaddr(struct elf_section *, int32_t, size_t); static void elf_section_header(int, int, uint32_t, void *, bool, uint32_t, int, int, int, int); static void elf_write_sections(void); static struct SAA *elf_build_symtab(int32_t *, int32_t *); static struct SAA *elf_build_reltab(uint64_t *, struct elf_reloc *); static void add_sectname(char *, char *); struct erel { int offset, info; }; struct symlininfo { int offset; int section; /* index into sects[] */ int segto; /* internal section number */ char *name; /* shallow-copied pointer of section name */ }; struct linelist { struct linelist *next; struct linelist *last; struct symlininfo info; char *filename; int line; }; struct sectlist { struct SAA *psaa; int section; int line; int offset; int file; struct sectlist *next; struct sectlist *last; }; /* common debug variables */ static int currentline = 1; static int debug_immcall = 0; /* stabs debug variables */ static struct linelist *stabslines = 0; static int numlinestabs = 0; static char *stabs_filename = 0; static uint8_t *stabbuf = 0, *stabstrbuf = 0, *stabrelbuf = 0; static int stablen, stabstrlen, stabrellen; /* dwarf debug variables */ static struct linelist *dwarf_flist = 0, *dwarf_clist = 0, *dwarf_elist = 0; static struct sectlist *dwarf_fsect = 0, *dwarf_csect = 0, *dwarf_esect = 0; static int dwarf_numfiles = 0, dwarf_nsections; static uint8_t *arangesbuf = 0, *arangesrelbuf = 0, *pubnamesbuf = 0, *infobuf = 0, *inforelbuf = 0, *abbrevbuf = 0, *linebuf = 0, *linerelbuf = 0, *framebuf = 0, *locbuf = 0; static int8_t line_base = -5, line_range = 14, opcode_base = 13; static int arangeslen, arangesrellen, pubnameslen, infolen, inforellen, abbrevlen, linelen, linerellen, framelen, loclen; static int32_t dwarf_infosym, dwarf_abbrevsym, dwarf_linesym; static struct dfmt df_dwarf; static struct dfmt df_stabs; static struct elf_symbol *lastsym; /* common debugging routines */ static void debugx32_typevalue(int32_t); static void debugx32_deflabel(char *, int32_t, int64_t, int, char *); static void debugx32_directive(const char *, const char *); /* stabs debugging routines */ static void stabsx32_linenum(const char *filename, int32_t linenumber, int32_t); static void stabsx32_output(int, void *); static void stabsx32_generate(void); static void stabsx32_cleanup(void); /* dwarf debugging routines */ static void dwarfx32_init(void); static void dwarfx32_linenum(const char *filename, int32_t linenumber, int32_t); static void dwarfx32_output(int, void *); static void dwarfx32_generate(void); static void dwarfx32_cleanup(void); static void dwarfx32_findfile(const char *); static void dwarfx32_findsect(const int); /* * Special section numbers which are used to define ELF special * symbols, which can be used with WRT to provide PIC relocation * types. */ static int32_t elf_gotpc_sect, elf_gotoff_sect; static int32_t elf_got_sect, elf_plt_sect; static int32_t elf_sym_sect; static int32_t elf_gottpoff_sect; static void elf_init(void) { maxbits = 64; sects = NULL; nsects = sectlen = 0; syms = saa_init((int32_t)sizeof(struct elf_symbol)); nlocals = nglobs = ndebugs = 0; bsym = raa_init(); strs = saa_init(1L); saa_wbytes(strs, "\0", 1L); saa_wbytes(strs, elf_module, strlen(elf_module)+1); strslen = 2 + strlen(elf_module); shstrtab = NULL; shstrtablen = shstrtabsize = 0;; add_sectname("", ""); fwds = NULL; elf_gotpc_sect = seg_alloc(); define_label("..gotpc", elf_gotpc_sect + 1, 0L, NULL, false, false); elf_gotoff_sect = seg_alloc(); define_label("..gotoff", elf_gotoff_sect + 1, 0L, NULL, false, false); elf_got_sect = seg_alloc(); define_label("..got", elf_got_sect + 1, 0L, NULL, false, false); elf_plt_sect = seg_alloc(); define_label("..plt", elf_plt_sect + 1, 0L, NULL, false, false); elf_sym_sect = seg_alloc(); define_label("..sym", elf_sym_sect + 1, 0L, NULL, false, false); elf_gottpoff_sect = seg_alloc(); define_label("..gottpoff", elf_gottpoff_sect + 1, 0L, NULL, false, false); def_seg = seg_alloc(); } static void elf_cleanup(int debuginfo) { struct elf_reloc *r; int i; (void)debuginfo; elf_write(); for (i = 0; i < nsects; i++) { if (sects[i]->type != SHT_NOBITS) saa_free(sects[i]->data); if (sects[i]->head) saa_free(sects[i]->rel); while (sects[i]->head) { r = sects[i]->head; sects[i]->head = sects[i]->head->next; nasm_free(r); } } nasm_free(sects); saa_free(syms); raa_free(bsym); saa_free(strs); if (of_elfx32.current_dfmt) { of_elfx32.current_dfmt->cleanup(); } } /* add entry to the elf .shstrtab section */ static void add_sectname(char *firsthalf, char *secondhalf) { int len = strlen(firsthalf) + strlen(secondhalf); while (shstrtablen + len + 1 > shstrtabsize) shstrtab = nasm_realloc(shstrtab, (shstrtabsize += SHSTR_DELTA)); strcpy(shstrtab + shstrtablen, firsthalf); strcat(shstrtab + shstrtablen, secondhalf); shstrtablen += len + 1; } static int elf_make_section(char *name, int type, int flags, int align) { struct elf_section *s; s = nasm_zalloc(sizeof(*s)); if (type != SHT_NOBITS) s->data = saa_init(1L); s->tail = &s->head; if (!strcmp(name, ".text")) s->index = def_seg; else s->index = seg_alloc(); add_sectname("", name); s->name = nasm_strdup(name); s->type = type; s->flags = flags; s->align = align; if (nsects >= sectlen) sects = nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects)); sects[nsects++] = s; return nsects - 1; } static int32_t elf_section_names(char *name, int pass, int *bits) { char *p; uint32_t flags, flags_and, flags_or; uint64_t align; int type, i; /* * Default is 64 bits. */ if (!name) { *bits = 64; return def_seg; } p = nasm_skip_word(name); if (*p) *p++ = '\0'; flags_and = flags_or = type = align = 0; elf_section_attrib(name, p, pass, &flags_and, &flags_or, &align, &type); if (!strcmp(name, ".shstrtab") || !strcmp(name, ".symtab") || !strcmp(name, ".strtab")) { nasm_error(ERR_NONFATAL, "attempt to redefine reserved section" "name `%s'", name); return NO_SEG; } for (i = 0; i < nsects; i++) if (!strcmp(name, sects[i]->name)) break; if (i == nsects) { const struct elf_known_section *ks = elf_known_sections; while (ks->name) { if (!strcmp(name, ks->name)) break; ks++; } type = type ? type : ks->type; align = align ? align : ks->align; flags = (ks->flags & ~flags_and) | flags_or; i = elf_make_section(name, type, flags, align); } else if (pass == 1) { if ((type && sects[i]->type != type) || (align && sects[i]->align != align) || (flags_and && ((sects[i]->flags & flags_and) != flags_or))) nasm_error(ERR_WARNING, "incompatible section attributes ignored on" " redeclaration of section `%s'", name); } return sects[i]->index; } static void elf_deflabel(char *name, int32_t segment, int64_t offset, int is_global, char *special) { int pos = strslen; struct elf_symbol *sym; bool special_used = false; #if defined(DEBUG) && DEBUG>2 nasm_error(ERR_DEBUG, " elf_deflabel: %s, seg=%"PRIx32", off=%"PRIx64", is_global=%d, %s\n", name, segment, offset, is_global, special); #endif if (name[0] == '.' && name[1] == '.' && name[2] != '@') { /* * This is a NASM special symbol. We never allow it into * the ELF symbol table, even if it's a valid one. If it * _isn't_ a valid one, we should barf immediately. */ if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") && strcmp(name, "..got") && strcmp(name, "..plt") && strcmp(name, "..sym") && strcmp(name, "..gottpoff")) nasm_error(ERR_NONFATAL, "unrecognised special symbol `%s'", name); return; } if (is_global == 3) { struct elf_symbol **s; /* * Fix up a forward-reference symbol size from the first * pass. */ for (s = &fwds; *s; s = &(*s)->nextfwd) if (!strcmp((*s)->name, name)) { struct tokenval tokval; expr *e; char *p = nasm_skip_spaces(nasm_skip_word(special)); stdscan_reset(); stdscan_set(p); tokval.t_type = TOKEN_INVALID; e = evaluate(stdscan, NULL, &tokval, NULL, 1, nasm_error, NULL); if (e) { if (!is_simple(e)) nasm_error(ERR_NONFATAL, "cannot use relocatable" " expression as symbol size"); else (*s)->size = reloc_value(e); } /* * Remove it from the list of unresolved sizes. */ nasm_free((*s)->name); *s = (*s)->nextfwd; return; } return; /* it wasn't an important one */ } saa_wbytes(strs, name, (int32_t)(1 + strlen(name))); strslen += 1 + strlen(name); lastsym = sym = saa_wstruct(syms); memset(&sym->symv, 0, sizeof(struct rbtree)); sym->strpos = pos; sym->type = is_global ? SYM_GLOBAL : SYM_LOCAL; sym->other = STV_DEFAULT; sym->size = 0; if (segment == NO_SEG) sym->section = SHN_ABS; else { int i; sym->section = SHN_UNDEF; if (segment == def_seg) { /* we have to be sure at least text section is there */ int tempint; if (segment != elf_section_names(".text", 2, &tempint)) nasm_error(ERR_PANIC, "strange segment conditions in ELF driver"); } for (i = 0; i < nsects; i++) { if (segment == sects[i]->index) { sym->section = i + 1; break; } } } if (is_global == 2) { sym->size = offset; sym->symv.key = 0; sym->section = SHN_COMMON; /* * We have a common variable. Check the special text to see * if it's a valid number and power of two; if so, store it * as the alignment for the common variable. */ if (special) { bool err; sym->symv.key = readnum(special, &err); if (err) nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a" " valid number", special); else if ((sym->symv.key | (sym->symv.key - 1)) != 2 * sym->symv.key - 1) nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a" " power of two", special); } special_used = true; } else sym->symv.key = (sym->section == SHN_UNDEF ? 0 : offset); if (sym->type == SYM_GLOBAL) { /* * If sym->section == SHN_ABS, then the first line of the * else section would cause a core dump, because its a reference * beyond the end of the section array. * This behaviour is exhibited by this code: * GLOBAL crash_nasm * crash_nasm equ 0 * To avoid such a crash, such requests are silently discarded. * This may not be the best solution. */ if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) { bsym = raa_write(bsym, segment, nglobs); } else if (sym->section != SHN_ABS) { /* * This is a global symbol; so we must add it to the rbtree * of global symbols in its section. * * In addition, we check the special text for symbol * type and size information. */ sects[sym->section-1]->gsyms = rb_insert(sects[sym->section-1]->gsyms, &sym->symv); if (special) { int n = strcspn(special, " \t"); if (!nasm_strnicmp(special, "function", n)) sym->type |= STT_FUNC; else if (!nasm_strnicmp(special, "data", n) || !nasm_strnicmp(special, "object", n)) sym->type |= STT_OBJECT; else if (!nasm_strnicmp(special, "notype", n)) sym->type |= STT_NOTYPE; else nasm_error(ERR_NONFATAL, "unrecognised symbol type `%.*s'", n, special); special += n; special = nasm_skip_spaces(special); if (*special) { n = strcspn(special, " \t"); if (!nasm_strnicmp(special, "default", n)) sym->other = STV_DEFAULT; else if (!nasm_strnicmp(special, "internal", n)) sym->other = STV_INTERNAL; else if (!nasm_strnicmp(special, "hidden", n)) sym->other = STV_HIDDEN; else if (!nasm_strnicmp(special, "protected", n)) sym->other = STV_PROTECTED; else n = 0; special += n; } if (*special) { struct tokenval tokval; expr *e; int fwd = 0; char *saveme = stdscan_get(); while (special[n] && nasm_isspace(special[n])) n++; /* * We have a size expression; attempt to * evaluate it. */ stdscan_reset(); stdscan_set(special + n); tokval.t_type = TOKEN_INVALID; e = evaluate(stdscan, NULL, &tokval, &fwd, 0, nasm_error, NULL); if (fwd) { sym->nextfwd = fwds; fwds = sym; sym->name = nasm_strdup(name); } else if (e) { if (!is_simple(e)) nasm_error(ERR_NONFATAL, "cannot use relocatable" " expression as symbol size"); else sym->size = reloc_value(e); } stdscan_set(saveme); } special_used = true; } /* * If TLS segment, mark symbol accordingly. */ if (sects[sym->section - 1]->flags & SHF_TLS) { sym->type &= 0xf0; sym->type |= STT_TLS; } } sym->globnum = nglobs; nglobs++; } else nlocals++; if (special && !special_used) nasm_error(ERR_NONFATAL, "no special symbol features supported here"); } static void elf_add_reloc(struct elf_section *sect, int32_t segment, int32_t offset, int type) { struct elf_reloc *r; r = *sect->tail = nasm_zalloc(sizeof(struct elf_reloc)); sect->tail = &r->next; r->address = sect->len; r->offset = offset; if (segment != NO_SEG) { int i; for (i = 0; i < nsects; i++) if (segment == sects[i]->index) r->symbol = i + 2; if (!r->symbol) r->symbol = GLOBAL_TEMP_BASE + raa_read(bsym, segment); } r->type = type; sect->nrelocs++; } /* * This routine deals with ..got and ..sym relocations: the more * complicated kinds. In shared-library writing, some relocations * with respect to global symbols must refer to the precise symbol * rather than referring to an offset from the base of the section * _containing_ the symbol. Such relocations call to this routine, * which searches the symbol list for the symbol in question. * * R_X86_64_GOT32 references require the _exact_ symbol address to be * used; R_X86_64_32 references can be at an offset from the symbol. * The boolean argument `exact' tells us this. * * Return value is the adjusted value of `addr', having become an * offset from the symbol rather than the section. Should always be * zero when returning from an exact call. * * Limitation: if you define two symbols at the same place, * confusion will occur. * * Inefficiency: we search, currently, using a linked list which * isn't even necessarily sorted. */ static void elf_add_gsym_reloc(struct elf_section *sect, int32_t segment, uint32_t offset, int32_t pcrel, int type, bool exact) { struct elf_reloc *r; struct elf_section *s; struct elf_symbol *sym; struct rbtree *srb; int i; /* * First look up the segment/offset pair and find a global * symbol corresponding to it. If it's not one of our segments, * then it must be an external symbol, in which case we're fine * doing a normal elf_add_reloc after first sanity-checking * that the offset from the symbol is zero. */ s = NULL; for (i = 0; i < nsects; i++) if (segment == sects[i]->index) { s = sects[i]; break; } if (!s) { if (exact && offset) nasm_error(ERR_NONFATAL, "invalid access to an external symbol"); else elf_add_reloc(sect, segment, offset - pcrel, type); return; } srb = rb_search(s->gsyms, offset); if (!srb || (exact && srb->key != offset)) { nasm_error(ERR_NONFATAL, "unable to find a suitable global symbol" " for this reference"); return; } sym = container_of(srb, struct elf_symbol, symv); r = *sect->tail = nasm_malloc(sizeof(struct elf_reloc)); sect->tail = &r->next; r->next = NULL; r->address = sect->len; r->offset = offset - pcrel - sym->symv.key; r->symbol = GLOBAL_TEMP_BASE + sym->globnum; r->type = type; sect->nrelocs++; } static void elf_out(int32_t segto, const void *data, enum out_type type, uint64_t size, int32_t segment, int32_t wrt) { struct elf_section *s; int32_t addr; int reltype, bytes; int i; static struct symlininfo sinfo; #if defined(DEBUG) && DEBUG>2 if (data) nasm_error(ERR_DEBUG, " elf_out line: %d type: %x seg: %"PRIx32" segto: %"PRIx32" bytes: %"PRIx64" data: %"PRIx64"\n", currentline, type, segment, segto, size, *(int64_t *)data); else nasm_error(ERR_DEBUG, " elf_out line: %d type: %x seg: %"PRIx32" segto: %"PRIx32" bytes: %"PRIx64"\n", currentline, type, segment, segto, size); #endif /* * handle absolute-assembly (structure definitions) */ if (segto == NO_SEG) { if (type != OUT_RESERVE) nasm_error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]" " space"); return; } s = NULL; for (i = 0; i < nsects; i++) if (segto == sects[i]->index) { s = sects[i]; break; } if (!s) { int tempint; /* ignored */ if (segto != elf_section_names(".text", 2, &tempint)) nasm_error(ERR_PANIC, "strange segment conditions in ELF driver"); else { s = sects[nsects - 1]; i = nsects - 1; } } /* again some stabs debugging stuff */ if (of_elfx32.current_dfmt) { sinfo.offset = s->len; sinfo.section = i; sinfo.segto = segto; sinfo.name = s->name; of_elfx32.current_dfmt->debug_output(TY_DEBUGSYMLIN, &sinfo); } /* end of debugging stuff */ if (s->type == SHT_NOBITS && type != OUT_RESERVE) { nasm_error(ERR_WARNING, "attempt to initialize memory in" " BSS section `%s': ignored", s->name); s->len += realsize(type, size); return; } switch (type) { case OUT_RESERVE: if (s->type == SHT_PROGBITS) { nasm_error(ERR_WARNING, "uninitialized space declared in" " non-BSS section `%s': zeroing", s->name); elf_sect_write(s, NULL, size); } else s->len += size; break; case OUT_RAWDATA: if (segment != NO_SEG) nasm_error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG"); elf_sect_write(s, data, size); break; case OUT_ADDRESS: { int isize = (int)size; int asize = abs(size); addr = *(int64_t *)data; if (segment == NO_SEG) { /* Do nothing */ } else if (segment % 2) { nasm_error(ERR_NONFATAL, "ELF format does not support" " segment base references"); } else { if (wrt == NO_SEG) { switch (isize) { case 1: case -1: elf_add_reloc(s, segment, addr, R_X86_64_8); break; case 2: case -2: elf_add_reloc(s, segment, addr, R_X86_64_16); break; case 4: elf_add_reloc(s, segment, addr, R_X86_64_32); break; case -4: elf_add_reloc(s, segment, addr, R_X86_64_32S); break; case 8: case -8: elf_add_reloc(s, segment, addr, R_X86_64_64); break; default: nasm_error(ERR_PANIC, "internal error elfx32-hpa-871"); break; } addr = 0; } else if (wrt == elf_gotpc_sect + 1) { /* * The user will supply GOT relative to $$. ELF * will let us have GOT relative to $. So we * need to fix up the data item by $-$$. */ addr += s->len; elf_add_reloc(s, segment, addr, R_X86_64_GOTPC32); addr = 0; } else if (wrt == elf_gotoff_sect + 1) { nasm_error(ERR_NONFATAL, "ELFX32 doesn't support " "R_X86_64_GOTOFF64"); } else if (wrt == elf_got_sect + 1) { switch (asize) { case 4: elf_add_gsym_reloc(s, segment, addr, 0, R_X86_64_GOT32, true); addr = 0; break; default: nasm_error(ERR_NONFATAL, "invalid ..got reference"); break; } } else if (wrt == elf_sym_sect + 1) { switch (isize) { case 1: case -1: elf_add_gsym_reloc(s, segment, addr, 0, R_X86_64_8, false); addr = 0; break; case 2: case -2: elf_add_gsym_reloc(s, segment, addr, 0, R_X86_64_16, false); addr = 0; break; case 4: elf_add_gsym_reloc(s, segment, addr, 0, R_X86_64_32, false); addr = 0; break; case -4: elf_add_gsym_reloc(s, segment, addr, 0, R_X86_64_32S, false); addr = 0; break; case 8: case -8: elf_add_gsym_reloc(s, segment, addr, 0, R_X86_64_64, false); addr = 0; break; default: nasm_error(ERR_PANIC, "internal error elfx32-hpa-903"); break; } } else if (wrt == elf_plt_sect + 1) { nasm_error(ERR_NONFATAL, "ELF format cannot produce non-PC-" "relative PLT references"); } else { nasm_error(ERR_NONFATAL, "ELF format does not support this" " use of WRT"); } } elf_sect_writeaddr(s, addr, asize); break; } case OUT_REL1ADR: reltype = R_X86_64_PC8; bytes = 1; goto rel12adr; case OUT_REL2ADR: reltype = R_X86_64_PC16; bytes = 2; goto rel12adr; rel12adr: addr = *(int64_t *)data - size; if (segment == segto) nasm_error(ERR_PANIC, "intra-segment OUT_REL1ADR"); if (segment == NO_SEG) { /* Do nothing */ } else if (segment % 2) { nasm_error(ERR_NONFATAL, "ELF format does not support" " segment base references"); } else { if (wrt == NO_SEG) { elf_add_reloc(s, segment, addr, reltype); addr = 0; } else { nasm_error(ERR_NONFATAL, "Unsupported non-32-bit ELF relocation"); } } elf_sect_writeaddr(s, addr, bytes); break; case OUT_REL4ADR: addr = *(int64_t *)data - size; if (segment == segto) nasm_error(ERR_PANIC, "intra-segment OUT_REL4ADR"); if (segment == NO_SEG) { /* Do nothing */ } else if (segment % 2) { nasm_error(ERR_NONFATAL, "ELFX32 format does not support" " segment base references"); } else { if (wrt == NO_SEG) { elf_add_reloc(s, segment, addr, R_X86_64_PC32); addr = 0; } else if (wrt == elf_plt_sect + 1) { elf_add_gsym_reloc(s, segment, addr+size, size, R_X86_64_PLT32, true); addr = 0; } else if (wrt == elf_gotpc_sect + 1 || wrt == elf_got_sect + 1) { elf_add_gsym_reloc(s, segment, addr+size, size, R_X86_64_GOTPCREL, true); addr = 0; } else if (wrt == elf_gotoff_sect + 1 || wrt == elf_got_sect + 1) { nasm_error(ERR_NONFATAL, "invalid ..gotoff reference"); } else if (wrt == elf_gottpoff_sect + 1) { elf_add_gsym_reloc(s, segment, addr+size, size, R_X86_64_GOTTPOFF, true); addr = 0; } else { nasm_error(ERR_NONFATAL, "ELFX32 format does not support this" " use of WRT"); } } elf_sect_writeaddr(s, addr, 4); break; case OUT_REL8ADR: nasm_error(ERR_NONFATAL, "32-bit ELF format does not support 64-bit relocations"); addr = 0; elf_sect_writeaddr(s, addr, 8); break; } } static void elf_write(void) { int align; char *p; int i; struct SAA *symtab; int32_t symtablen, symtablocal; /* * Work out how many sections we will have. We have SHN_UNDEF, * then the flexible user sections, then the fixed sections * `.shstrtab', `.symtab' and `.strtab', then optionally * relocation sections for the user sections. */ nsections = sec_numspecial + 1; if (of_elfx32.current_dfmt == &df_stabs) nsections += 3; else if (of_elfx32.current_dfmt == &df_dwarf) nsections += 10; add_sectname("", ".shstrtab"); add_sectname("", ".symtab"); add_sectname("", ".strtab"); for (i = 0; i < nsects; i++) { nsections++; /* for the section itself */ if (sects[i]->head) { nsections++; /* for its relocations */ add_sectname(".rela", sects[i]->name); } } if (of_elfx32.current_dfmt == &df_stabs) { /* in case the debug information is wanted, just add these three sections... */ add_sectname("", ".stab"); add_sectname("", ".stabstr"); add_sectname(".rel", ".stab"); } else if (of_elfx32.current_dfmt == &df_dwarf) { /* the dwarf debug standard specifies the following ten sections, not all of which are currently implemented, although all of them are defined. */ add_sectname("", ".debug_aranges"); add_sectname(".rela", ".debug_aranges"); add_sectname("", ".debug_pubnames"); add_sectname("", ".debug_info"); add_sectname(".rela", ".debug_info"); add_sectname("", ".debug_abbrev"); add_sectname("", ".debug_line"); add_sectname(".rela", ".debug_line"); add_sectname("", ".debug_frame"); add_sectname("", ".debug_loc"); } /* * Output the ELF header. */ nasm_write("\177ELF\1\1\1", 7, ofile); fputc(elf_osabi, ofile); fputc(elf_abiver, ofile); fwritezero(7, ofile); fwriteint16_t(ET_REL, ofile); /* relocatable file */ fwriteint16_t(EM_X86_64, ofile); /* processor ID */ fwriteint32_t(1L, ofile); /* EV_CURRENT file format version */ fwriteint32_t(0L, ofile); /* no entry point */ fwriteint32_t(0L, ofile); /* no program header table */ fwriteint32_t(0x40L, ofile); /* section headers straight after * ELF header plus alignment */ fwriteint32_t(0L, ofile); /* X86_64 defines no special flags */ fwriteint16_t(0x34, ofile); /* size of ELF header */ fwriteint16_t(0, ofile); /* no program header table, again */ fwriteint16_t(0, ofile); /* still no program header table */ fwriteint16_t(sizeof(Elf32_Shdr), ofile); /* size of section header */ fwriteint16_t(nsections, ofile); /* number of sections */ fwriteint16_t(sec_shstrtab, ofile); /* string table section index for * section header table */ fwriteint32_t(0L, ofile); /* align to 0x40 bytes */ fwriteint32_t(0L, ofile); fwriteint32_t(0L, ofile); /* * Build the symbol table and relocation tables. */ symtab = elf_build_symtab(&symtablen, &symtablocal); for (i = 0; i < nsects; i++) if (sects[i]->head) sects[i]->rel = elf_build_reltab(§s[i]->rellen, sects[i]->head); /* * Now output the section header table. */ elf_foffs = 0x40 + sizeof(Elf32_Shdr) * nsections; align = ALIGN(elf_foffs, SEC_FILEALIGN) - elf_foffs; elf_foffs += align; elf_nsect = 0; elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections); /* SHN_UNDEF */ elf_section_header(0, SHT_NULL, 0, NULL, false, 0, SHN_UNDEF, 0, 0, 0); p = shstrtab + 1; /* The normal sections */ for (i = 0; i < nsects; i++) { elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags, (sects[i]->type == SHT_PROGBITS ? sects[i]->data : NULL), true, sects[i]->len, 0, 0, sects[i]->align, 0); p += strlen(p) + 1; } /* .shstrtab */ elf_section_header(p - shstrtab, SHT_STRTAB, 0, shstrtab, false, shstrtablen, 0, 0, 1, 0); p += strlen(p) + 1; /* .symtab */ elf_section_header(p - shstrtab, SHT_SYMTAB, 0, symtab, true, symtablen, sec_strtab, symtablocal, 4, 16); p += strlen(p) + 1; /* .strtab */ elf_section_header(p - shstrtab, SHT_STRTAB, 0, strs, true, strslen, 0, 0, 1, 0); p += strlen(p) + 1; /* The relocation sections */ for (i = 0; i < nsects; i++) if (sects[i]->head) { elf_section_header(p - shstrtab, SHT_RELA, 0, sects[i]->rel, true, sects[i]->rellen, sec_symtab, i + 1, 4, 12); p += strlen(p) + 1; } if (of_elfx32.current_dfmt == &df_stabs) { /* for debugging information, create the last three sections which are the .stab , .stabstr and .rel.stab sections respectively */ /* this function call creates the stab sections in memory */ stabsx32_generate(); if (stabbuf && stabstrbuf && stabrelbuf) { elf_section_header(p - shstrtab, SHT_PROGBITS, 0, stabbuf, false, stablen, sec_stabstr, 0, 4, 12); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_STRTAB, 0, stabstrbuf, false, stabstrlen, 0, 0, 4, 0); p += strlen(p) + 1; /* link -> symtable info -> section to refer to */ elf_section_header(p - shstrtab, SHT_REL, 0, stabrelbuf, false, stabrellen, sec_symtab, sec_stab, 4, 8); p += strlen(p) + 1; } } else if (of_elfx32.current_dfmt == &df_dwarf) { /* for dwarf debugging information, create the ten dwarf sections */ /* this function call creates the dwarf sections in memory */ if (dwarf_fsect) dwarfx32_generate(); elf_section_header(p - shstrtab, SHT_PROGBITS, 0, arangesbuf, false, arangeslen, 0, 0, 1, 0); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_RELA, 0, arangesrelbuf, false, arangesrellen, sec_symtab, sec_debug_aranges, 1, 12); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_PROGBITS, 0, pubnamesbuf, false, pubnameslen, 0, 0, 1, 0); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_PROGBITS, 0, infobuf, false, infolen, 0, 0, 1, 0); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_RELA, 0, inforelbuf, false, inforellen, sec_symtab, sec_debug_info, 1, 12); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_PROGBITS, 0, abbrevbuf, false, abbrevlen, 0, 0, 1, 0); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_PROGBITS, 0, linebuf, false, linelen, 0, 0, 1, 0); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_RELA, 0, linerelbuf, false, linerellen, sec_symtab, sec_debug_line, 1, 12); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_PROGBITS, 0, framebuf, false, framelen, 0, 0, 8, 0); p += strlen(p) + 1; elf_section_header(p - shstrtab, SHT_PROGBITS, 0, locbuf, false, loclen, 0, 0, 1, 0); p += strlen(p) + 1; } fwritezero(align, ofile); /* * Now output the sections. */ elf_write_sections(); nasm_free(elf_sects); saa_free(symtab); } static struct SAA *elf_build_symtab(int32_t *len, int32_t *local) { struct SAA *s = saa_init(1L); struct elf_symbol *sym; uint8_t entry[24], *p; int i; *len = *local = 0; /* * First, an all-zeros entry, required by the ELF spec. */ saa_wbytes(s, NULL, 16L); /* null symbol table entry */ *len += 16; (*local)++; /* * Next, an entry for the file name. */ p = entry; WRITELONG(p, 1); /* we know it's 1st entry in strtab */ WRITELONG(p, 0); /* no value */ WRITELONG(p, 0); /* no size either */ WRITESHORT(p, STT_FILE); /* type FILE */ WRITESHORT(p, SHN_ABS); saa_wbytes(s, entry, 16L); *len += 16; (*local)++; /* * Now some standard symbols defining the segments, for relocation * purposes. */ for (i = 1; i <= nsects; i++) { p = entry; WRITELONG(p, 0); /* no symbol name */ WRITELONG(p, 0); /* offset zero */ WRITELONG(p, 0); /* size zero */ WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */ WRITESHORT(p, i); /* section id */ saa_wbytes(s, entry, 16L); *len += 16; (*local)++; } /* * Now the other local symbols. */ saa_rewind(syms); while ((sym = saa_rstruct(syms))) { if (sym->type & SYM_GLOBAL) continue; p = entry; WRITELONG(p, sym->strpos); /* index into symbol string table */ WRITELONG(p, sym->symv.key); /* value of symbol */ WRITELONG(p, sym->size); /* size of symbol */ WRITECHAR(p, sym->type); /* type and binding */ WRITECHAR(p, sym->other); /* visibility */ WRITESHORT(p, sym->section); /* index into section header table */ saa_wbytes(s, entry, 16L); *len += 16; (*local)++; } /* * dwarf needs symbols for debug sections * which are relocation targets. */ if (of_elfx32.current_dfmt == &df_dwarf) { dwarf_infosym = *local; p = entry; WRITELONG(p, 0); /* no symbol name */ WRITELONG(p, 0); /* offset zero */ WRITELONG(p, 0); /* size zero */ WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */ WRITESHORT(p, sec_debug_info); /* section id */ saa_wbytes(s, entry, 16L); *len += 16; (*local)++; dwarf_abbrevsym = *local; p = entry; WRITELONG(p, 0); /* no symbol name */ WRITELONG(p, 0); /* offset zero */ WRITELONG(p, 0); /* size zero */ WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */ WRITESHORT(p, sec_debug_abbrev); /* section id */ saa_wbytes(s, entry, 16L); *len += 16; (*local)++; dwarf_linesym = *local; p = entry; WRITELONG(p, 0); /* no symbol name */ WRITELONG(p, 0); /* offset zero */ WRITELONG(p, 0); /* size zero */ WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */ WRITESHORT(p, sec_debug_line); /* section id */ saa_wbytes(s, entry, 16L); *len += 16; (*local)++; } /* * Now the global symbols. */ saa_rewind(syms); while ((sym = saa_rstruct(syms))) { if (!(sym->type & SYM_GLOBAL)) continue; p = entry; WRITELONG(p, sym->strpos); WRITELONG(p, sym->symv.key); WRITELONG(p, sym->size); WRITECHAR(p, sym->type); /* type and binding */ WRITECHAR(p, sym->other); /* visibility */ WRITESHORT(p, sym->section); saa_wbytes(s, entry, 16L); *len += 16; } return s; } static struct SAA *elf_build_reltab(uint64_t *len, struct elf_reloc *r) { struct SAA *s; uint8_t *p, entry[12]; int32_t global_offset; if (!r) return NULL; s = saa_init(1L); *len = 0; /* * How to onvert from a global placeholder to a real symbol index; * the +2 refers to the two special entries, the null entry and * the filename entry. */ global_offset = -GLOBAL_TEMP_BASE + nsects + nlocals + ndebugs + 2; while (r) { int32_t sym = r->symbol; if (sym >= GLOBAL_TEMP_BASE) sym += global_offset; p = entry; WRITELONG(p, r->address); WRITELONG(p, (sym << 8) + r->type); WRITELONG(p, r->offset); saa_wbytes(s, entry, 12L); *len += 12; r = r->next; } return s; } static void elf_section_header(int name, int type, uint32_t flags, void *data, bool is_saa, uint32_t datalen, int link, int info, int align, int eltsize) { elf_sects[elf_nsect].data = data; elf_sects[elf_nsect].len = datalen; elf_sects[elf_nsect].is_saa = is_saa; elf_nsect++; fwriteint32_t((int32_t)name, ofile); fwriteint32_t((int32_t)type, ofile); fwriteint32_t((int32_t)flags, ofile); fwriteint32_t(0L, ofile); /* no address, ever, in object files */ fwriteint32_t(type == 0 ? 0L : elf_foffs, ofile); fwriteint32_t(datalen, ofile); if (data) elf_foffs += ALIGN(datalen, SEC_FILEALIGN); fwriteint32_t((int32_t)link, ofile); fwriteint32_t((int32_t)info, ofile); fwriteint32_t((int32_t)align, ofile); fwriteint32_t((int32_t)eltsize, ofile); } static void elf_write_sections(void) { int i; for (i = 0; i < elf_nsect; i++) if (elf_sects[i].data) { int32_t len = elf_sects[i].len; int32_t reallen = ALIGN(len, SEC_FILEALIGN); int32_t align = reallen - len; if (elf_sects[i].is_saa) saa_fpwrite(elf_sects[i].data, ofile); else nasm_write(elf_sects[i].data, len, ofile); fwritezero(align, ofile); } } static void elf_sect_write(struct elf_section *sect, const void *data, size_t len) { saa_wbytes(sect->data, data, len); sect->len += len; } static void elf_sect_writeaddr(struct elf_section *sect, int32_t data, size_t len) { saa_writeaddr(sect->data, data, len); sect->len += len; } static void elf_sectalign(int32_t seg, unsigned int value) { struct elf_section *s = NULL; int i; for (i = 0; i < nsects; i++) { if (sects[i]->index == seg) { s = sects[i]; break; } } if (!s || !is_power2(value)) return; if (value > s->align) s->align = value; } static int32_t elf_segbase(int32_t segment) { return segment; } static void elf_filename(char *inname, char *outname) { strcpy(elf_module, inname); standard_extension(inname, outname, ".o"); } extern macros_t elf_stdmac[]; static int elf_set_info(enum geninfo type, char **val) { (void)type; (void)val; return 0; } static struct dfmt df_dwarf = { "ELFX32 (x86-64) dwarf debug format for Linux/Unix", "dwarf", dwarfx32_init, dwarfx32_linenum, debugx32_deflabel, debugx32_directive, debugx32_typevalue, dwarfx32_output, dwarfx32_cleanup }; static struct dfmt df_stabs = { "ELFX32 (x86-64) stabs debug format for Linux/Unix", "stabs", null_debug_init, stabsx32_linenum, debugx32_deflabel, debugx32_directive, debugx32_typevalue, stabsx32_output, stabsx32_cleanup }; struct dfmt *elfx32_debugs_arr[3] = { &df_dwarf, &df_stabs, NULL }; struct ofmt of_elfx32 = { "ELFX32 (x86_64) object files (e.g. Linux)", "elfx32", 0, elfx32_debugs_arr, &df_stabs, elf_stdmac, elf_init, elf_set_info, elf_out, elf_deflabel, elf_section_names, elf_sectalign, elf_segbase, elf_directive, elf_filename, elf_cleanup }; /* common debugging routines */ static void debugx32_deflabel(char *name, int32_t segment, int64_t offset, int is_global, char *special) { (void)name; (void)segment; (void)offset; (void)is_global; (void)special; } static void debugx32_directive(const char *directive, const char *params) { (void)directive; (void)params; } static void debugx32_typevalue(int32_t type) { int32_t stype, ssize; switch (TYM_TYPE(type)) { case TY_LABEL: ssize = 0; stype = STT_NOTYPE; break; case TY_BYTE: ssize = 1; stype = STT_OBJECT; break; case TY_WORD: ssize = 2; stype = STT_OBJECT; break; case TY_DWORD: ssize = 4; stype = STT_OBJECT; break; case TY_FLOAT: ssize = 4; stype = STT_OBJECT; break; case TY_QWORD: ssize = 8; stype = STT_OBJECT; break; case TY_TBYTE: ssize = 10; stype = STT_OBJECT; break; case TY_OWORD: ssize = 16; stype = STT_OBJECT; break; case TY_YWORD: ssize = 32; stype = STT_OBJECT; break; case TY_COMMON: ssize = 0; stype = STT_COMMON; break; case TY_SEG: ssize = 0; stype = STT_SECTION; break; case TY_EXTERN: ssize = 0; stype = STT_NOTYPE; break; case TY_EQU: ssize = 0; stype = STT_NOTYPE; break; default: ssize = 0; stype = STT_NOTYPE; break; } if (stype == STT_OBJECT && lastsym && !lastsym->type) { lastsym->size = ssize; lastsym->type = stype; } } /* stabs debugging routines */ static void stabsx32_linenum(const char *filename, int32_t linenumber, int32_t segto) { (void)segto; if (!stabs_filename) { stabs_filename = (char *)nasm_malloc(strlen(filename) + 1); strcpy(stabs_filename, filename); } else { if (strcmp(stabs_filename, filename)) { /* yep, a memory leak...this program is one-shot anyway, so who cares... in fact, this leak comes in quite handy to maintain a list of files encountered so far in the symbol lines... */ /* why not nasm_free(stabs_filename); we're done with the old one */ stabs_filename = (char *)nasm_malloc(strlen(filename) + 1); strcpy(stabs_filename, filename); } } debug_immcall = 1; currentline = linenumber; } static void stabsx32_output(int type, void *param) { struct symlininfo *s; struct linelist *el; if (type == TY_DEBUGSYMLIN) { if (debug_immcall) { s = (struct symlininfo *)param; if (!(sects[s->section]->flags & SHF_EXECINSTR)) return; /* line info is only collected for executable sections */ numlinestabs++; el = (struct linelist *)nasm_malloc(sizeof(struct linelist)); el->info.offset = s->offset; el->info.section = s->section; el->info.name = s->name; el->line = currentline; el->filename = stabs_filename; el->next = 0; if (stabslines) { stabslines->last->next = el; stabslines->last = el; } else { stabslines = el; stabslines->last = el; } } } debug_immcall = 0; } /* for creating the .stab , .stabstr and .rel.stab sections in memory */ static void stabsx32_generate(void) { int i, numfiles, strsize, numstabs = 0, currfile, mainfileindex; uint8_t *sbuf, *ssbuf, *rbuf, *sptr, *rptr; char **allfiles; int *fileidx; struct linelist *ptr; ptr = stabslines; allfiles = (char **)nasm_zalloc(numlinestabs * sizeof(char *)); numfiles = 0; while (ptr) { if (numfiles == 0) { allfiles[0] = ptr->filename; numfiles++; } else { for (i = 0; i < numfiles; i++) { if (!strcmp(allfiles[i], ptr->filename)) break; } if (i >= numfiles) { allfiles[i] = ptr->filename; numfiles++; } } ptr = ptr->next; } strsize = 1; fileidx = (int *)nasm_malloc(numfiles * sizeof(int)); for (i = 0; i < numfiles; i++) { fileidx[i] = strsize; strsize += strlen(allfiles[i]) + 1; } mainfileindex = 0; for (i = 0; i < numfiles; i++) { if (!strcmp(allfiles[i], elf_module)) { mainfileindex = i; break; } } /* * worst case size of the stab buffer would be: * the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line * plus one "ending" entry */ sbuf = (uint8_t *)nasm_malloc((numlinestabs * 2 + 4) * sizeof(struct stabentry)); ssbuf = (uint8_t *)nasm_malloc(strsize); rbuf = (uint8_t *)nasm_malloc(numlinestabs * 8 * (2 + 3)); rptr = rbuf; for (i = 0; i < numfiles; i++) strcpy((char *)ssbuf + fileidx[i], allfiles[i]); ssbuf[0] = 0; stabstrlen = strsize; /* set global variable for length of stab strings */ sptr = sbuf; ptr = stabslines; numstabs = 0; if (ptr) { /* * this is the first stab, its strx points to the filename of the * the source-file, the n_desc field should be set to the number * of remaining stabs */ WRITE_STAB(sptr, fileidx[0], 0, 0, 0, strlen(allfiles[0] + 12)); /* this is the stab for the main source file */ WRITE_STAB(sptr, fileidx[mainfileindex], N_SO, 0, 0, 0); /* relocation table entry */ /* * Since the symbol table has two entries before * the section symbols, the index in the info.section * member must be adjusted by adding 2 */ WRITELONG(rptr, (sptr - sbuf) - 4); WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_X86_64_32); numstabs++; currfile = mainfileindex; } while (ptr) { if (strcmp(allfiles[currfile], ptr->filename)) { /* oops file has changed... */ for (i = 0; i < numfiles; i++) if (!strcmp(allfiles[i], ptr->filename)) break; currfile = i; WRITE_STAB(sptr, fileidx[currfile], N_SOL, 0, 0, ptr->info.offset); numstabs++; /* relocation table entry */ WRITELONG(rptr, (sptr - sbuf) - 4); WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_X86_64_32); } WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset); numstabs++; /* relocation table entry */ WRITELONG(rptr, (sptr - sbuf) - 4); WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_X86_64_32); ptr = ptr->next; } /* this is an "ending" token */ WRITE_STAB(sptr, 0, N_SO, 0, 0, 0); numstabs++; ((struct stabentry *)sbuf)->n_desc = numstabs; nasm_free(allfiles); nasm_free(fileidx); stablen = (sptr - sbuf); stabrellen = (rptr - rbuf); stabrelbuf = rbuf; stabbuf = sbuf; stabstrbuf = ssbuf; } static void stabsx32_cleanup(void) { struct linelist *ptr, *del; if (!stabslines) return; ptr = stabslines; while (ptr) { del = ptr; ptr = ptr->next; nasm_free(del); } nasm_free(stabbuf); nasm_free(stabrelbuf); nasm_free(stabstrbuf); } /* dwarf routines */ static void dwarfx32_init(void) { ndebugs = 3; /* 3 debug symbols */ } static void dwarfx32_linenum(const char *filename, int32_t linenumber, int32_t segto) { (void)segto; dwarfx32_findfile(filename); debug_immcall = 1; currentline = linenumber; } /* called from elf_out with type == TY_DEBUGSYMLIN */ static void dwarfx32_output(int type, void *param) { int ln, aa, inx, maxln, soc; struct symlininfo *s; struct SAA *plinep; (void)type; s = (struct symlininfo *)param; /* line number info is only gathered for executable sections */ if (!(sects[s->section]->flags & SHF_EXECINSTR)) return; /* Check if section index has changed */ if (!(dwarf_csect && (dwarf_csect->section) == (s->section))) dwarfx32_findsect(s->section); /* do nothing unless line or file has changed */ if (!debug_immcall) return; ln = currentline - dwarf_csect->line; aa = s->offset - dwarf_csect->offset; inx = dwarf_clist->line; plinep = dwarf_csect->psaa; /* check for file change */ if (!(inx == dwarf_csect->file)) { saa_write8(plinep,DW_LNS_set_file); saa_write8(plinep,inx); dwarf_csect->file = inx; } /* check for line change */ if (ln) { /* test if in range of special op code */ maxln = line_base + line_range; soc = (ln - line_base) + (line_range * aa) + opcode_base; if (ln >= line_base && ln < maxln && soc < 256) { saa_write8(plinep,soc); } else { saa_write8(plinep,DW_LNS_advance_line); saa_wleb128s(plinep,ln); if (aa) { saa_write8(plinep,DW_LNS_advance_pc); saa_wleb128u(plinep,aa); } } dwarf_csect->line = currentline; dwarf_csect->offset = s->offset; } /* show change handled */ debug_immcall = 0; } static void dwarfx32_generate(void) { uint8_t *pbuf; int indx; struct linelist *ftentry; struct SAA *paranges, *ppubnames, *pinfo, *pabbrev, *plines, *plinep; struct SAA *parangesrel, *plinesrel, *pinforel; struct sectlist *psect; size_t saalen, linepoff, totlen, highaddr; /* write epilogues for each line program range */ /* and build aranges section */ paranges = saa_init(1L); parangesrel = saa_init(1L); saa_write16(paranges,3); /* dwarf version */ saa_write32(parangesrel, paranges->datalen+4); saa_write32(parangesrel, (dwarf_infosym << 8) + R_X86_64_32); /* reloc to info */ saa_write32(parangesrel, 0); saa_write32(paranges,0); /* offset into info */ saa_write8(paranges,4); /* pointer size */ saa_write8(paranges,0); /* not segmented */ saa_write32(paranges,0); /* padding */ /* iterate though sectlist entries */ psect = dwarf_fsect; totlen = 0; highaddr = 0; for (indx = 0; indx < dwarf_nsections; indx++) { plinep = psect->psaa; /* Line Number Program Epilogue */ saa_write8(plinep,2); /* std op 2 */ saa_write8(plinep,(sects[psect->section]->len)-psect->offset); saa_write8(plinep,DW_LNS_extended_op); saa_write8(plinep,1); /* operand length */ saa_write8(plinep,DW_LNE_end_sequence); totlen += plinep->datalen; /* range table relocation entry */ saa_write32(parangesrel, paranges->datalen + 4); saa_write32(parangesrel, ((uint32_t) (psect->section + 2) << 8) + R_X86_64_32); saa_write32(parangesrel, (uint32_t) 0); /* range table entry */ saa_write32(paranges,0x0000); /* range start */ saa_write32(paranges,sects[psect->section]->len); /* range length */ highaddr += sects[psect->section]->len; /* done with this entry */ psect = psect->next; } saa_write32(paranges,0); /* null address */ saa_write32(paranges,0); /* null length */ saalen = paranges->datalen; arangeslen = saalen + 4; arangesbuf = pbuf = nasm_malloc(arangeslen); WRITELONG(pbuf,saalen); /* initial length */ saa_rnbytes(paranges, pbuf, saalen); saa_free(paranges); /* build rela.aranges section */ arangesrellen = saalen = parangesrel->datalen; arangesrelbuf = pbuf = nasm_malloc(arangesrellen); saa_rnbytes(parangesrel, pbuf, saalen); saa_free(parangesrel); /* build pubnames section */ ppubnames = saa_init(1L); saa_write16(ppubnames,3); /* dwarf version */ saa_write32(ppubnames,0); /* offset into info */ saa_write32(ppubnames,0); /* space used in info */ saa_write32(ppubnames,0); /* end of list */ saalen = ppubnames->datalen; pubnameslen = saalen + 4; pubnamesbuf = pbuf = nasm_malloc(pubnameslen); WRITELONG(pbuf,saalen); /* initial length */ saa_rnbytes(ppubnames, pbuf, saalen); saa_free(ppubnames); /* build info section */ pinfo = saa_init(1L); pinforel = saa_init(1L); saa_write16(pinfo,3); /* dwarf version */ saa_write32(pinforel, pinfo->datalen + 4); saa_write32(pinforel, (dwarf_abbrevsym << 8) + R_X86_64_32); /* reloc to abbrev */ saa_write32(pinforel, 0); saa_write32(pinfo,0); /* offset into abbrev */ saa_write8(pinfo,4); /* pointer size */ saa_write8(pinfo,1); /* abbrviation number LEB128u */ saa_write32(pinforel, pinfo->datalen + 4); saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_X86_64_32); saa_write32(pinforel, 0); saa_write32(pinfo,0); /* DW_AT_low_pc */ saa_write32(pinforel, pinfo->datalen + 4); saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_X86_64_32); saa_write32(pinforel, 0); saa_write32(pinfo,highaddr); /* DW_AT_high_pc */ saa_write32(pinforel, pinfo->datalen + 4); saa_write32(pinforel, (dwarf_linesym << 8) + R_X86_64_32); /* reloc to line */ saa_write32(pinforel, 0); saa_write32(pinfo,0); /* DW_AT_stmt_list */ saa_wbytes(pinfo, elf_module, strlen(elf_module)+1); saa_wbytes(pinfo, nasm_signature, strlen(nasm_signature)+1); saa_write16(pinfo,DW_LANG_Mips_Assembler); saa_write8(pinfo,2); /* abbrviation number LEB128u */ saa_write32(pinforel, pinfo->datalen + 4); saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_X86_64_32); saa_write32(pinforel, 0); saa_write32(pinfo,0); /* DW_AT_low_pc */ saa_write32(pinfo,0); /* DW_AT_frame_base */ saa_write8(pinfo,0); /* end of entries */ saalen = pinfo->datalen; infolen = saalen + 4; infobuf = pbuf = nasm_malloc(infolen); WRITELONG(pbuf,saalen); /* initial length */ saa_rnbytes(pinfo, pbuf, saalen); saa_free(pinfo); /* build rela.info section */ inforellen = saalen = pinforel->datalen; inforelbuf = pbuf = nasm_malloc(inforellen); saa_rnbytes(pinforel, pbuf, saalen); saa_free(pinforel); /* build abbrev section */ pabbrev = saa_init(1L); saa_write8(pabbrev,1); /* entry number LEB128u */ saa_write8(pabbrev,DW_TAG_compile_unit); /* tag LEB128u */ saa_write8(pabbrev,1); /* has children */ /* the following attributes and forms are all LEB128u values */ saa_write8(pabbrev,DW_AT_low_pc); saa_write8(pabbrev,DW_FORM_addr); saa_write8(pabbrev,DW_AT_high_pc); saa_write8(pabbrev,DW_FORM_addr); saa_write8(pabbrev,DW_AT_stmt_list); saa_write8(pabbrev,DW_FORM_data4); saa_write8(pabbrev,DW_AT_name); saa_write8(pabbrev,DW_FORM_string); saa_write8(pabbrev,DW_AT_producer); saa_write8(pabbrev,DW_FORM_string); saa_write8(pabbrev,DW_AT_language); saa_write8(pabbrev,DW_FORM_data2); saa_write16(pabbrev,0); /* end of entry */ /* LEB128u usage same as above */ saa_write8(pabbrev,2); /* entry number */ saa_write8(pabbrev,DW_TAG_subprogram); saa_write8(pabbrev,0); /* no children */ saa_write8(pabbrev,DW_AT_low_pc); saa_write8(pabbrev,DW_FORM_addr); saa_write8(pabbrev,DW_AT_frame_base); saa_write8(pabbrev,DW_FORM_data4); saa_write16(pabbrev,0); /* end of entry */ abbrevlen = saalen = pabbrev->datalen; abbrevbuf = pbuf = nasm_malloc(saalen); saa_rnbytes(pabbrev, pbuf, saalen); saa_free(pabbrev); /* build line section */ /* prolog */ plines = saa_init(1L); saa_write8(plines,1); /* Minimum Instruction Length */ saa_write8(plines,1); /* Initial value of 'is_stmt' */ saa_write8(plines,line_base); /* Line Base */ saa_write8(plines,line_range); /* Line Range */ saa_write8(plines,opcode_base); /* Opcode Base */ /* standard opcode lengths (# of LEB128u operands) */ saa_write8(plines,0); /* Std opcode 1 length */ saa_write8(plines,1); /* Std opcode 2 length */ saa_write8(plines,1); /* Std opcode 3 length */ saa_write8(plines,1); /* Std opcode 4 length */ saa_write8(plines,1); /* Std opcode 5 length */ saa_write8(plines,0); /* Std opcode 6 length */ saa_write8(plines,0); /* Std opcode 7 length */ saa_write8(plines,0); /* Std opcode 8 length */ saa_write8(plines,1); /* Std opcode 9 length */ saa_write8(plines,0); /* Std opcode 10 length */ saa_write8(plines,0); /* Std opcode 11 length */ saa_write8(plines,1); /* Std opcode 12 length */ /* Directory Table */ saa_write8(plines,0); /* End of table */ /* File Name Table */ ftentry = dwarf_flist; for (indx = 0;indxfilename, (int32_t)(strlen(ftentry->filename) + 1)); saa_write8(plines,0); /* directory LEB128u */ saa_write8(plines,0); /* time LEB128u */ saa_write8(plines,0); /* size LEB128u */ ftentry = ftentry->next; } saa_write8(plines,0); /* End of table */ linepoff = plines->datalen; linelen = linepoff + totlen + 10; linebuf = pbuf = nasm_malloc(linelen); WRITELONG(pbuf,linelen-4); /* initial length */ WRITESHORT(pbuf,3); /* dwarf version */ WRITELONG(pbuf,linepoff); /* offset to line number program */ /* write line header */ saalen = linepoff; saa_rnbytes(plines, pbuf, saalen); /* read a given no. of bytes */ pbuf += linepoff; saa_free(plines); /* concatonate line program ranges */ linepoff += 13; plinesrel = saa_init(1L); psect = dwarf_fsect; for (indx = 0; indx < dwarf_nsections; indx++) { saa_write32(plinesrel, linepoff); saa_write32(plinesrel, ((psect->section + 2) << 8) + R_X86_64_32); saa_write32(plinesrel, 0); plinep = psect->psaa; saalen = plinep->datalen; saa_rnbytes(plinep, pbuf, saalen); pbuf += saalen; linepoff += saalen; saa_free(plinep); /* done with this entry */ psect = psect->next; } /* build rela.lines section */ linerellen =saalen = plinesrel->datalen; linerelbuf = pbuf = nasm_malloc(linerellen); saa_rnbytes(plinesrel, pbuf, saalen); saa_free(plinesrel); /* build frame section */ framelen = 4; framebuf = pbuf = nasm_malloc(framelen); WRITELONG(pbuf,framelen-4); /* initial length */ /* build loc section */ loclen = 16; locbuf = pbuf = nasm_malloc(loclen); WRITELONG(pbuf,0); /* null beginning offset */ WRITELONG(pbuf,0); /* null ending offset */ } static void dwarfx32_cleanup(void) { nasm_free(arangesbuf); nasm_free(arangesrelbuf); nasm_free(pubnamesbuf); nasm_free(infobuf); nasm_free(inforelbuf); nasm_free(abbrevbuf); nasm_free(linebuf); nasm_free(linerelbuf); nasm_free(framebuf); nasm_free(locbuf); } static void dwarfx32_findfile(const char * fname) { int finx; struct linelist *match; /* return if fname is current file name */ if (dwarf_clist && !(strcmp(fname, dwarf_clist->filename))) return; /* search for match */ match = 0; if (dwarf_flist) { match = dwarf_flist; for (finx = 0; finx < dwarf_numfiles; finx++) { if (!(strcmp(fname, match->filename))) { dwarf_clist = match; return; } } } /* add file name to end of list */ dwarf_clist = (struct linelist *)nasm_malloc(sizeof(struct linelist)); dwarf_numfiles++; dwarf_clist->line = dwarf_numfiles; dwarf_clist->filename = nasm_malloc(strlen(fname) + 1); strcpy(dwarf_clist->filename,fname); dwarf_clist->next = 0; if (!dwarf_flist) { /* if first entry */ dwarf_flist = dwarf_elist = dwarf_clist; dwarf_clist->last = 0; } else { /* chain to previous entry */ dwarf_elist->next = dwarf_clist; dwarf_elist = dwarf_clist; } } static void dwarfx32_findsect(const int index) { int sinx; struct sectlist *match; struct SAA *plinep; /* return if index is current section index */ if (dwarf_csect && (dwarf_csect->section == index)) return; /* search for match */ match = 0; if (dwarf_fsect) { match = dwarf_fsect; for (sinx = 0; sinx < dwarf_nsections; sinx++) { if (match->section == index) { dwarf_csect = match; return; } match = match->next; } } /* add entry to end of list */ dwarf_csect = (struct sectlist *)nasm_malloc(sizeof(struct sectlist)); dwarf_nsections++; dwarf_csect->psaa = plinep = saa_init(1L); dwarf_csect->line = 1; dwarf_csect->offset = 0; dwarf_csect->file = 1; dwarf_csect->section = index; dwarf_csect->next = 0; /* set relocatable address at start of line program */ saa_write8(plinep,DW_LNS_extended_op); saa_write8(plinep,5); /* operand length */ saa_write8(plinep,DW_LNE_set_address); saa_write32(plinep,0); /* Start Address */ if (!dwarf_fsect) { /* if first entry */ dwarf_fsect = dwarf_esect = dwarf_csect; dwarf_csect->last = 0; } else { /* chain to previous entry */ dwarf_esect->next = dwarf_csect; dwarf_esect = dwarf_csect; } } #endif /* OF_ELFX32 */