From 04633d07b68b79207d4800a4db7ba89394c33d0e Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Fri, 3 Feb 2012 12:06:04 -0800 Subject: [PATCH] backend: add support for x32 ELF Add an x32 ELF (32-bit code with the CPU in 64-bit mode) backend. --- Makefile.in | 5 + Mkfiles/msvc.mak | 5 + Mkfiles/netware.mak | 4 + Mkfiles/openwcom.mak | 5 + Mkfiles/owlinux.mak | 5 + output/outelf.c | 4 +- output/outelfx32.c | 2194 ++++++++++++++++++++++++++++++++++++++++++++++++++ output/outform.h | 13 + 8 files changed, 2233 insertions(+), 2 deletions(-) create mode 100644 output/outelfx32.c diff --git a/Makefile.in b/Makefile.in index 89f2bed..2a465eb 100644 --- a/Makefile.in +++ b/Makefile.in @@ -74,6 +74,7 @@ NASM = nasm.$(O) nasmlib.$(O) ver.$(O) \ output/nullout.$(O) \ output/outbin.$(O) output/outaout.$(O) output/outcoff.$(O) \ output/outelf.$(O) output/outelf32.$(O) output/outelf64.$(O) \ + output/outelfx32.$(O) \ output/outobj.$(O) output/outas86.$(O) output/outrdf2.$(O) \ output/outdbg.$(O) output/outieee.$(O) output/outmac32.$(O) \ output/outmac64.$(O) preproc.$(O) quote.$(O) pptok.$(O) \ @@ -349,6 +350,10 @@ output/outelf64.$(O): output/outelf64.c compiler.h config.h directiv.h \ eval.h insnsi.h nasm.h nasmlib.h opflags.h output/dwarf.h output/elf.h \ output/outelf.h output/outform.h output/outlib.h output/stabs.h pptok.h \ preproc.h raa.h rbtree.h regs.h saa.h stdscan.h +output/outelfx32.$(O): output/outelfx32.c compiler.h config.h directiv.h \ + eval.h insnsi.h nasm.h nasmlib.h opflags.h output/dwarf.h output/elf.h \ + output/outelf.h output/outform.h output/outlib.h output/stabs.h pptok.h \ + preproc.h raa.h rbtree.h regs.h saa.h stdscan.h output/outform.$(O): output/outform.c compiler.h config.h directiv.h \ insnsi.h nasm.h nasmlib.h opflags.h output/outform.h pptok.h preproc.h \ regs.h diff --git a/Mkfiles/msvc.mak b/Mkfiles/msvc.mak index f0aeaa9..2a9ee82 100644 --- a/Mkfiles/msvc.mak +++ b/Mkfiles/msvc.mak @@ -43,6 +43,7 @@ NASM = nasm.$(O) nasmlib.$(O) ver.$(O) \ output/nullout.$(O) \ output/outbin.$(O) output/outaout.$(O) output/outcoff.$(O) \ output/outelf.$(O) output/outelf32.$(O) output/outelf64.$(O) \ + output/outelfx32.$(O) \ output/outobj.$(O) output/outas86.$(O) output/outrdf2.$(O) \ output/outdbg.$(O) output/outieee.$(O) output/outmac32.$(O) \ output/outmac64.$(O) preproc.$(O) quote.$(O) pptok.$(O) \ @@ -258,6 +259,10 @@ output/outelf64.$(O): output/outelf64.c compiler.h directiv.h eval.h \ insnsi.h nasm.h nasmlib.h opflags.h output/dwarf.h output/elf.h \ output/outelf.h output/outform.h output/outlib.h output/stabs.h pptok.h \ preproc.h raa.h rbtree.h regs.h saa.h stdscan.h +output/outelfx32.$(O): output/outelfx32.c compiler.h directiv.h eval.h \ + insnsi.h nasm.h nasmlib.h opflags.h output/dwarf.h output/elf.h \ + output/outelf.h output/outform.h output/outlib.h output/stabs.h pptok.h \ + preproc.h raa.h rbtree.h regs.h saa.h stdscan.h output/outform.$(O): output/outform.c compiler.h directiv.h insnsi.h nasm.h \ nasmlib.h opflags.h output/outform.h pptok.h preproc.h regs.h output/outieee.$(O): output/outieee.c compiler.h directiv.h insnsi.h nasm.h \ diff --git a/Mkfiles/netware.mak b/Mkfiles/netware.mak index bb8b715..fb33c23 100644 --- a/Mkfiles/netware.mak +++ b/Mkfiles/netware.mak @@ -39,6 +39,7 @@ NASM = nasm.o nasmlib.o ver.o \ nullout.o \ outbin.o outaout.o outcoff.o \ outelf.o outelf32.o outelf64.o \ + outelfx32.o \ outobj.o outas86.o outrdf2.o \ outdbg.o outieee.o outmac32.o \ outmac64.o preproc.o quote.o pptok.o \ @@ -193,6 +194,9 @@ outelf32.o: outelf32.c compiler.h config.h directiv.h eval.h insnsi.h nasm.h \ outelf64.o: outelf64.c compiler.h config.h directiv.h eval.h insnsi.h nasm.h \ nasmlib.h opflags.h dwarf.h elf.h outelf.h outform.h outlib.h stabs.h \ pptok.h preproc.h raa.h rbtree.h regs.h saa.h stdscan.h +outelfx32.o: outelfx32.c compiler.h config.h directiv.h eval.h insnsi.h \ + nasm.h nasmlib.h opflags.h dwarf.h elf.h outelf.h outform.h outlib.h \ + stabs.h pptok.h preproc.h raa.h rbtree.h regs.h saa.h stdscan.h outform.o: outform.c compiler.h config.h directiv.h insnsi.h nasm.h \ nasmlib.h opflags.h outform.h pptok.h preproc.h regs.h outieee.o: outieee.c compiler.h config.h directiv.h insnsi.h nasm.h \ diff --git a/Mkfiles/openwcom.mak b/Mkfiles/openwcom.mak index a4b159c..2f1a2cf 100644 --- a/Mkfiles/openwcom.mak +++ b/Mkfiles/openwcom.mak @@ -55,6 +55,7 @@ NASM = nasm.$(O) nasmlib.$(O) ver.$(O) & output/nullout.$(O) & output/outbin.$(O) output/outaout.$(O) output/outcoff.$(O) & output/outelf.$(O) output/outelf32.$(O) output/outelf64.$(O) & + output/outelfx32.$(O) & output/outobj.$(O) output/outas86.$(O) output/outrdf2.$(O) & output/outdbg.$(O) output/outieee.$(O) output/outmac32.$(O) & output/outmac64.$(O) preproc.$(O) quote.$(O) pptok.$(O) & @@ -332,6 +333,10 @@ output/outelf64.$(O): output/outelf64.c compiler.h config.h directiv.h & eval.h insnsi.h nasm.h nasmlib.h opflags.h output/dwarf.h output/elf.h & output/outelf.h output/outform.h output/outlib.h output/stabs.h pptok.h & preproc.h raa.h rbtree.h regs.h saa.h stdscan.h +output/outelfx32.$(O): output/outelfx32.c compiler.h config.h directiv.h & + eval.h insnsi.h nasm.h nasmlib.h opflags.h output/dwarf.h output/elf.h & + output/outelf.h output/outform.h output/outlib.h output/stabs.h pptok.h & + preproc.h raa.h rbtree.h regs.h saa.h stdscan.h output/outform.$(O): output/outform.c compiler.h config.h directiv.h & insnsi.h nasm.h nasmlib.h opflags.h output/outform.h pptok.h preproc.h & regs.h diff --git a/Mkfiles/owlinux.mak b/Mkfiles/owlinux.mak index 6979876..5e4a793 100644 --- a/Mkfiles/owlinux.mak +++ b/Mkfiles/owlinux.mak @@ -66,6 +66,7 @@ NASM = nasm.$(O) nasmlib.$(O) ver.$(O) \ output/nullout.$(O) \ output/outbin.$(O) output/outaout.$(O) output/outcoff.$(O) \ output/outelf.$(O) output/outelf32.$(O) output/outelf64.$(O) \ + output/outelfx32.$(O) \ output/outobj.$(O) output/outas86.$(O) output/outrdf2.$(O) \ output/outdbg.$(O) output/outieee.$(O) output/outmac32.$(O) \ output/outmac64.$(O) preproc.$(O) quote.$(O) pptok.$(O) \ @@ -297,6 +298,10 @@ output/outelf64.$(O): output/outelf64.c compiler.h directiv.h eval.h \ insnsi.h nasm.h nasmlib.h opflags.h output/dwarf.h output/elf.h \ output/outelf.h output/outform.h output/outlib.h output/stabs.h pptok.h \ preproc.h raa.h rbtree.h regs.h saa.h stdscan.h +output/outelfx32.$(O): output/outelfx32.c compiler.h directiv.h eval.h \ + insnsi.h nasm.h nasmlib.h opflags.h output/dwarf.h output/elf.h \ + output/outelf.h output/outform.h output/outlib.h output/stabs.h pptok.h \ + preproc.h raa.h rbtree.h regs.h saa.h stdscan.h output/outform.$(O): output/outform.c compiler.h directiv.h insnsi.h nasm.h \ nasmlib.h opflags.h output/outform.h pptok.h preproc.h regs.h output/outieee.$(O): output/outieee.c compiler.h directiv.h insnsi.h nasm.h \ diff --git a/output/outelf.c b/output/outelf.c index 6d43b86..9ec0035 100644 --- a/output/outelf.c +++ b/output/outelf.c @@ -48,7 +48,7 @@ #include "output/elf.h" #include "output/outelf.h" -#if defined(OF_ELF32) || defined(OF_ELF64) +#if defined(OF_ELF32) || defined(OF_ELF64) || defined(OF_ELFX32) const struct elf_known_section elf_known_sections[] = { { ".text", SHT_PROGBITS, SHF_ALLOC|SHF_EXECINSTR, 16 }, @@ -120,4 +120,4 @@ void section_attrib(char *name, char *attr, int pass, } } -#endif /* defined(OF_ELF32) || defined(OF_ELF64) */ +#endif /* defined(OF_ELF32) || defined(OF_ELF64) || defined(OF_ELFX32) */ diff --git a/output/outelfx32.c b/output/outelfx32.c new file mode 100644 index 0000000..914a83e --- /dev/null +++ b/output/outelfx32.c @@ -0,0 +1,2194 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 2012 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 + +/* + * Relocation types. + */ +struct Reloc { + struct Reloc *next; + int32_t address; /* relative to _start_ of section */ + int32_t symbol; /* symbol index */ + int32_t offset; /* symbol addend */ + int type; /* type of relocation */ +}; + +struct Symbol { + struct rbtree symv; /* symbol value and rbtree of globals */ + int32_t strpos; /* string table position of name */ + int32_t section; /* section ID of the symbol */ + int type; /* symbol type */ + int other; /* symbol visibility */ + int32_t size; /* size of symbol */ + int32_t globnum; /* symbol table offset if global */ + struct Symbol *nextfwd; /* list of unresolved-size symbols */ + char *name; /* used temporarily if in above list */ +}; + +struct Section { + struct SAA *data; + uint32_t len, size, nrelocs; + int32_t index; /* index into sects array */ + int type; /* SHT_PROGBITS or SHT_NOBITS */ + uint32_t align; /* alignment: power of two */ + uint32_t flags; /* section flags */ + char *name; + struct SAA *rel; + uint32_t rellen; + struct Reloc *head, **tail; + struct rbtree *gsyms; /* global symbols in section */ +}; + +#define SECT_DELTA 32 +static struct 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 Symbol *fwds; + +static char elf_module[FILENAME_MAX]; + +static uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */ +static uint8_t elf_abiver = 0; /* Current ABI version */ + +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 Section *, const void *, size_t); +static void elf_sect_writeaddr(struct 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(uint32_t *, struct 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 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 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 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 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; + + 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 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 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 Section *sect, int32_t segment, + int32_t offset, int type) +{ + struct Reloc *r; + + r = *sect->tail = nasm_zalloc(sizeof(struct 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 Section *sect, + int32_t segment, uint32_t offset, int32_t pcrel, + int type, bool exact) +{ + struct Reloc *r; + struct Section *s; + struct 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 Symbol, symv); + + r = *sect->tail = nasm_malloc(sizeof(struct 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 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: + 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 ((int)size) { + case 1: + elf_add_reloc(s, segment, addr, R_X86_64_8); + break; + 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 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 ((int)size) { + 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 ((int)size) { + case 1: + elf_add_gsym_reloc(s, segment, addr, 0, + R_X86_64_8, false); + addr = 0; + break; + 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 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, size); + 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. + */ + fwrite("\177ELF\1\1\1", 7, 1, 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 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(uint32_t *len, struct 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 + fwrite(elf_sects[i].data, len, 1, ofile); + fwritezero(align, ofile); + } +} + +static void elf_sect_write(struct Section *sect, const void *data, size_t len) +{ + saa_wbytes(sect->data, data, len); + sect->len += len; +} +static void elf_sect_writeaddr(struct 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 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 int elf_directive(enum directives directive, char *value, int pass) +{ + bool err; + int64_t n; + char *p; + + switch (directive) { + case D_OSABI: + if (pass == 2) + return 1; /* ignore in pass 2 */ + + n = readnum(value, &err); + if (err) { + nasm_error(ERR_NONFATAL, "`osabi' directive requires a parameter"); + return 1; + } + if (n < 0 || n > 255) { + nasm_error(ERR_NONFATAL, "valid osabi numbers are 0 to 255"); + return 1; + } + elf_osabi = n; + elf_abiver = 0; + + if ((p = strchr(value,',')) == NULL) + return 1; + + n = readnum(p+1, &err); + if (err || n < 0 || n > 255) { + nasm_error(ERR_NONFATAL, "invalid ABI version number (valid: 0 to 255)"); + return 1; + } + + elf_abiver = n; + return 1; + + default: + return 0; + } +} + +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 */ diff --git a/output/outform.h b/output/outform.h index 4b809b7..d37a61b 100644 --- a/output/outform.h +++ b/output/outform.h @@ -106,6 +106,9 @@ #ifndef OF_ELF32 #define OF_ELF32 #endif +#ifndef OF_ELFX32 +#define OF_ELFX32 +#endif #ifndef OF_ELF64 #define OF_ELF64 #endif @@ -179,6 +182,9 @@ #ifndef OF_ELF64 #define OF_ELF64 #endif +#ifndef OF_ELFX32 +#define OF_ELFX32 +#endif #endif #ifdef OF_OTHERS @@ -215,6 +221,9 @@ #ifdef OF_NO_ELF64 #undef OF_ELF64 #endif +#ifdef OF_NO_ELFX32 +#undef OF_ELFX32 +#endif #ifdef OF_NO_AOUT #undef OF_AOUT #endif @@ -260,6 +269,7 @@ extern struct ofmt of_aout; extern struct ofmt of_aoutb; extern struct ofmt of_coff; extern struct ofmt of_elf32; +extern struct ofmt of_elfx32; extern struct ofmt of_elf64; extern struct ofmt of_as86; extern struct ofmt of_obj; @@ -299,6 +309,9 @@ static struct ofmt *drivers[] = { #ifdef OF_ELF64 &of_elf64, #endif +#ifdef OF_ELFX32 + &of_elfx32, +#endif #ifdef OF_AS86 &of_as86, #endif -- 2.7.4