diff options
Diffstat (limited to 'binutils-2.24/gas/config/obj-macho.c')
| -rw-r--r-- | binutils-2.24/gas/config/obj-macho.c | 1990 |
1 files changed, 0 insertions, 1990 deletions
diff --git a/binutils-2.24/gas/config/obj-macho.c b/binutils-2.24/gas/config/obj-macho.c deleted file mode 100644 index 21281a0e..00000000 --- a/binutils-2.24/gas/config/obj-macho.c +++ /dev/null @@ -1,1990 +0,0 @@ -/* Mach-O object file format - Copyright 2009, 2011, 2012 Free Software Foundation, Inc. - - This file is part of GAS, the GNU Assembler. - - GAS is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 3, - or (at your option) any later version. - - GAS is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See - the GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with GAS; see the file COPYING. If not, write to the Free - Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA - 02110-1301, USA. */ - -/* Here we handle the mach-o directives that are common to all architectures. - - Most significant are mach-o named sections and a variety of symbol type - decorations. */ - -/* Mach-O supports multiple, named segments each of which may contain - multiple named sections. Thus the concept of subsectioning is - handled by (say) having a __TEXT segment with appropriate flags from - which subsections are generated like __text, __const etc. - - The well-known as short-hand section switch directives like .text, .data - etc. are mapped onto predefined segment/section pairs using facilites - supplied by the mach-o port of bfd. - - A number of additional mach-o short-hand section switch directives are - also defined. */ - -#define OBJ_HEADER "obj-macho.h" - -#include "as.h" -#include "subsegs.h" -#include "symbols.h" -#include "write.h" -#include "mach-o.h" -#include "mach-o/loader.h" -#include "obj-macho.h" - -#include <string.h> - -/* Forward decls. */ -static segT obj_mach_o_segT_from_bfd_name (const char *, int); - -/* TODO: Implement "-dynamic"/"-static" command line options. */ - -static int obj_mach_o_is_static; - -/* TODO: Implement the "-n" command line option to suppress the initial - switch to the text segment. */ - -static int obj_mach_o_start_with_text_section = 1; - -/* Allow for special re-ordering on output. */ - -static int obj_mach_o_seen_objc_section; - -/* Start-up: At present, just create the sections we want. */ -void -mach_o_begin (void) -{ - /* Mach-O only defines the .text section by default, and even this can - be suppressed by a flag. In the latter event, the first code MUST - be a section definition. */ - if (obj_mach_o_start_with_text_section) - { - text_section = obj_mach_o_segT_from_bfd_name (TEXT_SECTION_NAME, 1); - subseg_set (text_section, 0); - if (obj_mach_o_is_static) - { - bfd_mach_o_section *mo_sec - = bfd_mach_o_get_mach_o_section (text_section); - mo_sec->flags &= ~BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS; - } - } -} - -/* Remember the subsections_by_symbols state in case we need to reset - the file flags. */ - -static int obj_mach_o_subsections_by_symbols; - -/* This will put at most 16 characters (terminated by a ',' or newline) from - the input stream into dest. If there are more than 16 chars before the - delimiter, a warning is given and the string is truncated. On completion of - this function, input_line_pointer will point to the char after the ',' or - to the newline. - - It trims leading and trailing space. */ - -static int -collect_16char_name (char *dest, const char *msg, int require_comma) -{ - char c, *namstart; - - SKIP_WHITESPACE (); - namstart = input_line_pointer; - - while ( (c = *input_line_pointer) != ',' - && !is_end_of_line[(unsigned char) c]) - input_line_pointer++; - - { - int len = input_line_pointer - namstart; /* could be zero. */ - /* lose any trailing space. */ - while (len > 0 && namstart[len-1] == ' ') - len--; - if (len > 16) - { - *input_line_pointer = '\0'; /* make a temp string. */ - as_bad (_("the %s name '%s' is too long (maximum 16 characters)"), - msg, namstart); - *input_line_pointer = c; /* restore for printing. */ - len = 16; - } - if (len > 0) - memcpy (dest, namstart, len); - } - - if (c != ',' && require_comma) - { - as_bad (_("expected a %s name followed by a `,'"), msg); - return 1; - } - - return 0; -} - -static int -obj_mach_o_get_section_names (char *seg, char *sec, - unsigned segl, unsigned secl) -{ - /* Zero-length segment and section names are allowed. */ - /* Parse segment name. */ - memset (seg, 0, segl); - if (collect_16char_name (seg, "segment", 1)) - { - ignore_rest_of_line (); - return 0; - } - input_line_pointer++; /* Skip the terminating ',' */ - - /* Parse section name, which can be empty. */ - memset (sec, 0, secl); - collect_16char_name (sec, "section", 0); - return 1; -} - -/* Build (or get) a section from the mach-o description - which includes - optional definitions for type, attributes, alignment and stub size. - - BFD supplies default values for sections which have a canonical name. */ - -#define SECT_TYPE_SPECIFIED 0x0001 -#define SECT_ATTR_SPECIFIED 0x0002 -#define SECT_ALGN_SPECIFIED 0x0004 -#define SECT_STUB_SPECIFIED 0x0008 - -static segT -obj_mach_o_make_or_get_sect (char * segname, char * sectname, - unsigned int specified_mask, - unsigned int usectype, unsigned int usecattr, - unsigned int ualign, offsetT stub_size) -{ - unsigned int sectype, secattr, secalign; - flagword oldflags, flags; - const char *name; - segT sec; - bfd_mach_o_section *msect; - const mach_o_section_name_xlat *xlat; - - /* This provides default bfd flags and default mach-o section type and - attributes along with the canonical name. */ - xlat = bfd_mach_o_section_data_for_mach_sect (stdoutput, segname, sectname); - - /* TODO: more checking of whether overides are acually allowed. */ - - if (xlat != NULL) - { - name = xstrdup (xlat->bfd_name); - sectype = xlat->macho_sectype; - if (specified_mask & SECT_TYPE_SPECIFIED) - { - if ((sectype == BFD_MACH_O_S_ZEROFILL - || sectype == BFD_MACH_O_S_GB_ZEROFILL) - && sectype != usectype) - as_bad (_("cannot overide zerofill section type for `%s,%s'"), - segname, sectname); - else - sectype = usectype; - } - secattr = xlat->macho_secattr; - secalign = xlat->sectalign; - flags = xlat->bfd_flags; - } - else - { - /* There is no normal BFD section name for this section. Create one. - The name created doesn't really matter as it will never be written - on disk. */ - size_t seglen = strlen (segname); - size_t sectlen = strlen (sectname); - char *n; - - n = xmalloc (seglen + 1 + sectlen + 1); - memcpy (n, segname, seglen); - n[seglen] = '.'; - memcpy (n + seglen + 1, sectname, sectlen); - n[seglen + 1 + sectlen] = 0; - name = n; - if (specified_mask & SECT_TYPE_SPECIFIED) - sectype = usectype; - else - sectype = BFD_MACH_O_S_REGULAR; - secattr = BFD_MACH_O_S_ATTR_NONE; - secalign = 0; - flags = SEC_NO_FLAGS; - } - - /* For now, just use what the user provided. */ - - if (specified_mask & SECT_ATTR_SPECIFIED) - secattr = usecattr; - - if (specified_mask & SECT_ALGN_SPECIFIED) - secalign = ualign; - - /* Sub-segments don't exists as is on Mach-O. */ - sec = subseg_new (name, 0); - - oldflags = bfd_get_section_flags (stdoutput, sec); - msect = bfd_mach_o_get_mach_o_section (sec); - - if (oldflags == SEC_NO_FLAGS) - { - /* In the absence of canonical information, try to determine CODE and - DEBUG section flags from the mach-o section data. */ - if (flags == SEC_NO_FLAGS - && (specified_mask & SECT_ATTR_SPECIFIED) - && (secattr & BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS)) - flags |= SEC_CODE; - - if (flags == SEC_NO_FLAGS - && (specified_mask & SECT_ATTR_SPECIFIED) - && (secattr & BFD_MACH_O_S_ATTR_DEBUG)) - flags |= SEC_DEBUGGING; - - /* New, so just use the defaults or what's specified. */ - if (! bfd_set_section_flags (stdoutput, sec, flags)) - as_warn (_("failed to set flags for \"%s\": %s"), - bfd_section_name (stdoutput, sec), - bfd_errmsg (bfd_get_error ())); - - strncpy (msect->segname, segname, sizeof (msect->segname)); - strncpy (msect->sectname, sectname, sizeof (msect->sectname)); - - msect->align = secalign; - msect->flags = sectype | secattr; - - if (sectype == BFD_MACH_O_S_ZEROFILL - || sectype == BFD_MACH_O_S_GB_ZEROFILL) - seg_info (sec)->bss = 1; - } - else if (flags != SEC_NO_FLAGS) - { - if (flags != oldflags - || msect->flags != (secattr | sectype)) - as_warn (_("Ignoring changed section attributes for %s"), name); - } - - if (specified_mask & SECT_STUB_SPECIFIED) - /* At present, the stub size is not supplied from the BFD tables. */ - msect->reserved2 = stub_size; - - return sec; -} - -/* .section - - The '.section' specification syntax looks like: - .section <segment> , <section> [, type [, attribs [, size]]] - - White space is allowed everywhere between elements. - - <segment> and <section> may be from 0 to 16 chars in length - they may - contain spaces but leading and trailing space will be trimmed. It is - mandatory that they be present (or that zero-length names are indicated - by ",,"). - - There is only a single section type for any entry. - - There may be multiple attributes, they are delimited by `+'. - - Not all section types and attributes are accepted by the Darwin system - assemblers as user-specifiable - although, at present, we do here. */ - -static void -obj_mach_o_section (int ignore ATTRIBUTE_UNUSED) -{ - unsigned int sectype = BFD_MACH_O_S_REGULAR; - unsigned int specified_mask = 0; - unsigned int secattr = 0; - offsetT sizeof_stub = 0; - segT new_seg; - char segname[17]; - char sectname[17]; - -#ifdef md_flush_pending_output - md_flush_pending_output (); -#endif - - /* Get the User's segment annd section names. */ - if (! obj_mach_o_get_section_names (segname, sectname, 17, 17)) - return; - - /* Parse section type, if present. */ - if (*input_line_pointer == ',') - { - char *p; - char c; - char tmpc; - int len; - input_line_pointer++; - SKIP_WHITESPACE (); - p = input_line_pointer; - while ((c = *input_line_pointer) != ',' - && !is_end_of_line[(unsigned char) c]) - input_line_pointer++; - - len = input_line_pointer - p; - /* strip trailing spaces. */ - while (len > 0 && p[len-1] == ' ') - len--; - tmpc = p[len]; - - /* Temporarily make a string from the token. */ - p[len] = 0; - sectype = bfd_mach_o_get_section_type_from_name (stdoutput, p); - if (sectype > 255) /* Max Section ID == 255. */ - { - as_bad (_("unknown or invalid section type '%s'"), p); - p[len] = tmpc; - ignore_rest_of_line (); - return; - } - else - specified_mask |= SECT_TYPE_SPECIFIED; - /* Restore. */ - p[len] = tmpc; - - /* Parse attributes. - TODO: check validity of attributes for section type. */ - if ((specified_mask & SECT_TYPE_SPECIFIED) - && c == ',') - { - do - { - int attr; - - /* Skip initial `,' and subsequent `+'. */ - input_line_pointer++; - SKIP_WHITESPACE (); - p = input_line_pointer; - while ((c = *input_line_pointer) != '+' - && c != ',' - && !is_end_of_line[(unsigned char) c]) - input_line_pointer++; - - len = input_line_pointer - p; - /* strip trailing spaces. */ - while (len > 0 && p[len-1] == ' ') - len--; - tmpc = p[len]; - - /* Temporarily make a string from the token. */ - p[len] ='\0'; - attr = bfd_mach_o_get_section_attribute_from_name (p); - if (attr == -1) - { - as_bad (_("unknown or invalid section attribute '%s'"), p); - p[len] = tmpc; - ignore_rest_of_line (); - return; - } - else - { - specified_mask |= SECT_ATTR_SPECIFIED; - secattr |= attr; - } - /* Restore. */ - p[len] = tmpc; - } - while (*input_line_pointer == '+'); - - /* Parse sizeof_stub. */ - if ((specified_mask & SECT_ATTR_SPECIFIED) - && *input_line_pointer == ',') - { - if (sectype != BFD_MACH_O_S_SYMBOL_STUBS) - { - as_bad (_("unexpected section size information")); - ignore_rest_of_line (); - return; - } - - input_line_pointer++; - sizeof_stub = get_absolute_expression (); - specified_mask |= SECT_STUB_SPECIFIED; - } - else if ((specified_mask & SECT_ATTR_SPECIFIED) - && sectype == BFD_MACH_O_S_SYMBOL_STUBS) - { - as_bad (_("missing sizeof_stub expression")); - ignore_rest_of_line (); - return; - } - } - } - - new_seg = obj_mach_o_make_or_get_sect (segname, sectname, specified_mask, - sectype, secattr, 0 /*align */, - sizeof_stub); - if (new_seg != NULL) - { - subseg_set (new_seg, 0); - demand_empty_rest_of_line (); - } -} - -/* .zerofill segname, sectname [, symbolname, size [, align]] - - Zerofill switches, temporarily, to a sect of type 'zerofill'. - - If a variable name is given, it defines that in the section. - Otherwise it just creates the section if it doesn't exist. */ - -static void -obj_mach_o_zerofill (int ignore ATTRIBUTE_UNUSED) -{ - char segname[17]; - char sectname[17]; - segT old_seg = now_seg; - segT new_seg; - symbolS *sym = NULL; - unsigned int align = 0; - unsigned int specified_mask = 0; - offsetT size = 0; - -#ifdef md_flush_pending_output - md_flush_pending_output (); -#endif - - /* Get the User's segment annd section names. */ - if (! obj_mach_o_get_section_names (segname, sectname, 17, 17)) - return; - - /* Parse variable definition, if present. */ - if (*input_line_pointer == ',') - { - /* Parse symbol, size [.align] - We follow the method of s_common_internal, with the difference - that the symbol cannot be a duplicate-common. */ - char *name; - char c; - char *p; - expressionS exp; - - input_line_pointer++; /* Skip ',' */ - SKIP_WHITESPACE (); - name = input_line_pointer; - c = get_symbol_end (); - /* Just after name is now '\0'. */ - p = input_line_pointer; - *p = c; - - if (name == p) - { - as_bad (_("expected symbol name")); - ignore_rest_of_line (); - goto done; - } - - SKIP_WHITESPACE (); - if (*input_line_pointer == ',') - input_line_pointer++; - - expression_and_evaluate (&exp); - if (exp.X_op != O_constant - && exp.X_op != O_absent) - { - as_bad (_("bad or irreducible absolute expression")); - ignore_rest_of_line (); - goto done; - } - else if (exp.X_op == O_absent) - { - as_bad (_("missing size expression")); - ignore_rest_of_line (); - goto done; - } - - size = exp.X_add_number; - size &= ((offsetT) 2 << (stdoutput->arch_info->bits_per_address - 1)) - 1; - if (exp.X_add_number != size || !exp.X_unsigned) - { - as_warn (_("size (%ld) out of range, ignored"), - (long) exp.X_add_number); - ignore_rest_of_line (); - goto done; - } - - *p = 0; /* Make the name into a c string for err messages. */ - sym = symbol_find_or_make (name); - if (S_IS_DEFINED (sym) || symbol_equated_p (sym)) - { - as_bad (_("symbol `%s' is already defined"), name); - *p = c; - ignore_rest_of_line (); - goto done; - } - - size = S_GET_VALUE (sym); - if (size == 0) - size = exp.X_add_number; - else if (size != exp.X_add_number) - as_warn (_("size of \"%s\" is already %ld; not changing to %ld"), - name, (long) size, (long) exp.X_add_number); - - *p = c; /* Restore the termination char. */ - - SKIP_WHITESPACE (); - if (*input_line_pointer == ',') - { - align = (unsigned int) parse_align (0); - if (align == (unsigned int) -1) - { - as_warn (_("align value not recognized, using size")); - align = size; - } - if (align > 15) - { - as_warn (_("Alignment (%lu) too large: 15 assumed."), - (unsigned long)align); - align = 15; - } - specified_mask |= SECT_ALGN_SPECIFIED; - } - } - /* else just a section definition. */ - - specified_mask |= SECT_TYPE_SPECIFIED; - new_seg = obj_mach_o_make_or_get_sect (segname, sectname, specified_mask, - BFD_MACH_O_S_ZEROFILL, - BFD_MACH_O_S_ATTR_NONE, - align, (offsetT) 0 /*stub size*/); - if (new_seg == NULL) - return; - - /* In case the user specifies the bss section by mach-o name. - Create it on demand */ - if (strcmp (new_seg->name, BSS_SECTION_NAME) == 0 - && bss_section == NULL) - bss_section = new_seg; - - subseg_set (new_seg, 0); - - if (sym != NULL) - { - char *pfrag; - - if (align) - { - record_alignment (new_seg, align); - frag_align (align, 0, 0); - } - - /* Detach from old frag. */ - if (S_GET_SEGMENT (sym) == new_seg) - symbol_get_frag (sym)->fr_symbol = NULL; - - symbol_set_frag (sym, frag_now); - pfrag = frag_var (rs_org, 1, 1, 0, sym, size, NULL); - *pfrag = 0; - - S_SET_SEGMENT (sym, new_seg); - if (new_seg == bss_section) - S_CLEAR_EXTERNAL (sym); - } - -done: - /* switch back to the section that was current before the .zerofill. */ - subseg_set (old_seg, 0); -} - -static segT -obj_mach_o_segT_from_bfd_name (const char *nam, int must_succeed) -{ - const mach_o_section_name_xlat *xlat; - const char *segn; - segT sec; - - /* BFD has tables of flags and default attributes for all the sections that - have a 'canonical' name. */ - xlat = bfd_mach_o_section_data_for_bfd_name (stdoutput, nam, &segn); - if (xlat == NULL) - { - if (must_succeed) - as_fatal (_("BFD is out of sync with GAS, " - "unhandled well-known section type `%s'"), nam); - return NULL; - } - - sec = bfd_get_section_by_name (stdoutput, nam); - if (sec == NULL) - { - bfd_mach_o_section *msect; - - sec = subseg_force_new (xlat->bfd_name, 0); - - /* Set default type, attributes and alignment. */ - msect = bfd_mach_o_get_mach_o_section (sec); - msect->flags = xlat->macho_sectype | xlat->macho_secattr; - msect->align = xlat->sectalign; - - if ((msect->flags & BFD_MACH_O_SECTION_TYPE_MASK) - == BFD_MACH_O_S_ZEROFILL) - seg_info (sec)->bss = 1; - } - - return sec; -} - -static const char * const known_sections[] = -{ - /* 0 */ NULL, - /* __TEXT */ - /* 1 */ ".const", - /* 2 */ ".static_const", - /* 3 */ ".cstring", - /* 4 */ ".literal4", - /* 5 */ ".literal8", - /* 6 */ ".literal16", - /* 7 */ ".constructor", - /* 8 */ ".destructor", - /* 9 */ ".eh_frame", - /* __DATA */ - /* 10 */ ".const_data", - /* 11 */ ".static_data", - /* 12 */ ".mod_init_func", - /* 13 */ ".mod_term_func", - /* 14 */ ".dyld", - /* 15 */ ".cfstring" -}; - -/* Interface for a known non-optional section directive. */ - -static void -obj_mach_o_known_section (int sect_index) -{ - segT section; - -#ifdef md_flush_pending_output - md_flush_pending_output (); -#endif - - section = obj_mach_o_segT_from_bfd_name (known_sections[sect_index], 1); - if (section != NULL) - subseg_set (section, 0); - - /* else, we leave the section as it was; there was a fatal error anyway. */ -} - -static const char * const objc_sections[] = -{ - /* 0 */ NULL, - /* 1 */ ".objc_class", - /* 2 */ ".objc_meta_class", - /* 3 */ ".objc_cat_cls_meth", - /* 4 */ ".objc_cat_inst_meth", - /* 5 */ ".objc_protocol", - /* 6 */ ".objc_string_object", - /* 7 */ ".objc_cls_meth", - /* 8 */ ".objc_inst_meth", - /* 9 */ ".objc_cls_refs", - /* 10 */ ".objc_message_refs", - /* 11 */ ".objc_symbols", - /* 12 */ ".objc_category", - /* 13 */ ".objc_class_vars", - /* 14 */ ".objc_instance_vars", - /* 15 */ ".objc_module_info", - /* 16 */ ".cstring", /* objc_class_names Alias for .cstring */ - /* 17 */ ".cstring", /* Alias objc_meth_var_types for .cstring */ - /* 18 */ ".cstring", /* objc_meth_var_names Alias for .cstring */ - /* 19 */ ".objc_selector_strs", - /* 20 */ ".objc_image_info", /* extension. */ - /* 21 */ ".objc_selector_fixup", /* extension. */ - /* 22 */ ".objc1_class_ext", /* ObjC-1 extension. */ - /* 23 */ ".objc1_property_list", /* ObjC-1 extension. */ - /* 24 */ ".objc1_protocol_ext" /* ObjC-1 extension. */ -}; - -/* This currently does the same as known_sections, but kept separate for - ease of maintenance. */ - -static void -obj_mach_o_objc_section (int sect_index) -{ - segT section; - -#ifdef md_flush_pending_output - md_flush_pending_output (); -#endif - - section = obj_mach_o_segT_from_bfd_name (objc_sections[sect_index], 1); - if (section != NULL) - { - obj_mach_o_seen_objc_section = 1; /* We need to ensure that certain - sections are present and in the - right order. */ - subseg_set (section, 0); - } - - /* else, we leave the section as it was; there was a fatal error anyway. */ -} - -/* Debug section directives. */ - -static const char * const debug_sections[] = -{ - /* 0 */ NULL, - /* __DWARF */ - /* 1 */ ".debug_frame", - /* 2 */ ".debug_info", - /* 3 */ ".debug_abbrev", - /* 4 */ ".debug_aranges", - /* 5 */ ".debug_macinfo", - /* 6 */ ".debug_line", - /* 7 */ ".debug_loc", - /* 8 */ ".debug_pubnames", - /* 9 */ ".debug_pubtypes", - /* 10 */ ".debug_str", - /* 11 */ ".debug_ranges", - /* 12 */ ".debug_macro" -}; - -/* ??? Maybe these should be conditional on gdwarf-*. - It`s also likely that we will need to be able to set them from the cfi - code. */ - -static void -obj_mach_o_debug_section (int sect_index) -{ - segT section; - -#ifdef md_flush_pending_output - md_flush_pending_output (); -#endif - - section = obj_mach_o_segT_from_bfd_name (debug_sections[sect_index], 1); - if (section != NULL) - subseg_set (section, 0); - - /* else, we leave the section as it was; there was a fatal error anyway. */ -} - -/* This could be moved to the tc-xx files, but there is so little dependency - there, that the code might as well be shared. */ - -struct opt_tgt_sect -{ - const char *name; - unsigned x86_val; - unsigned ppc_val; -}; - -/* The extensions here are for specific sections that are generated by GCC - and Darwin system tools, but don't have directives in the `system as'. */ - -static const struct opt_tgt_sect tgt_sections[] = -{ - /* 0 */ { NULL, 0, 0}, - /* 1 */ { ".lazy_symbol_pointer", 0, 0}, - /* 2 */ { ".lazy_symbol_pointer2", 0, 0}, /* X86 - extension */ - /* 3 */ { ".lazy_symbol_pointer3", 0, 0}, /* X86 - extension */ - /* 4 */ { ".non_lazy_symbol_pointer", 0, 0}, - /* 5 */ { ".non_lazy_symbol_pointer_x86", 0, 0}, /* X86 - extension */ - /* 6 */ { ".symbol_stub", 16, 20}, - /* 7 */ { ".symbol_stub1", 0, 16}, /* PPC - extension */ - /* 8 */ { ".picsymbol_stub", 26, 36}, - /* 9 */ { ".picsymbol_stub1", 0, 32}, /* PPC - extension */ - /* 10 */ { ".picsymbol_stub2", 25, 0}, /* X86 - extension */ - /* 11 */ { ".picsymbol_stub3", 5, 0}, /* X86 - extension */ -}; - -/* Interface for an optional section directive. */ - -static void -obj_mach_o_opt_tgt_section (int sect_index) -{ - const struct opt_tgt_sect *tgtsct = &tgt_sections[sect_index]; - segT section; - -#ifdef md_flush_pending_output - md_flush_pending_output (); -#endif - - section = obj_mach_o_segT_from_bfd_name (tgtsct->name, 0); - if (section == NULL) - { - as_bad (_("%s is not used for the selected target"), tgtsct->name); - /* Leave the section as it is. */ - } - else - { - bfd_mach_o_section *mo_sec = bfd_mach_o_get_mach_o_section (section); - subseg_set (section, 0); -#if defined (TC_I386) - mo_sec->reserved2 = tgtsct->x86_val; -#elif defined (TC_PPC) - mo_sec->reserved2 = tgtsct->ppc_val; -#else - mo_sec->reserved2 = 0; -#endif - } -} - -/* We don't necessarily have the three 'base' sections on mach-o. - Normally, we would start up with only the 'text' section defined. - However, even that can be suppressed with (TODO) c/l option "-n". - Thus, we have to be able to create all three sections on-demand. */ - -static void -obj_mach_o_base_section (int sect_index) -{ - segT section; - -#ifdef md_flush_pending_output - md_flush_pending_output (); -#endif - - /* We don't support numeric (or any other) qualifications on the - well-known section shorthands. */ - demand_empty_rest_of_line (); - - switch (sect_index) - { - /* Handle the three sections that are globally known within GAS. - For Mach-O, these are created on demand rather than at startup. */ - case 1: - if (text_section == NULL) - text_section = obj_mach_o_segT_from_bfd_name (TEXT_SECTION_NAME, 1); - if (obj_mach_o_is_static) - { - bfd_mach_o_section *mo_sec - = bfd_mach_o_get_mach_o_section (text_section); - mo_sec->flags &= ~BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS; - } - section = text_section; - break; - case 2: - if (data_section == NULL) - data_section = obj_mach_o_segT_from_bfd_name (DATA_SECTION_NAME, 1); - section = data_section; - break; - case 3: - /* ??? maybe this achieves very little, as an addition. */ - if (bss_section == NULL) - { - bss_section = obj_mach_o_segT_from_bfd_name (BSS_SECTION_NAME, 1); - seg_info (bss_section)->bss = 1; - } - section = bss_section; - break; - default: - as_fatal (_("internal error: base section index out of range")); - return; - break; - } - subseg_set (section, 0); -} - -/* This finishes off parsing a .comm or .lcomm statement, which both can have - an (optional) alignment field. It also allows us to create the bss section - on demand. */ - -static symbolS * -obj_mach_o_common_parse (int is_local, symbolS *symbolP, - addressT size) -{ - addressT align = 0; - bfd_mach_o_asymbol *s; - - SKIP_WHITESPACE (); - - /* Both comm and lcomm take an optional alignment, as a power - of two between 1 and 15. */ - if (*input_line_pointer == ',') - { - /* We expect a power of 2. */ - align = parse_align (0); - if (align == (addressT) -1) - return NULL; - if (align > 15) - { - as_warn (_("Alignment (%lu) too large: 15 assumed."), - (unsigned long)align); - align = 15; - } - } - - s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (symbolP); - if (is_local) - { - /* Create the BSS section on demand. */ - if (bss_section == NULL) - { - bss_section = obj_mach_o_segT_from_bfd_name (BSS_SECTION_NAME, 1); - seg_info (bss_section)->bss = 1; - } - bss_alloc (symbolP, size, align); - s->n_type = BFD_MACH_O_N_SECT; - S_CLEAR_EXTERNAL (symbolP); - } - else - { - S_SET_VALUE (symbolP, size); - S_SET_ALIGN (symbolP, align); - S_SET_EXTERNAL (symbolP); - S_SET_SEGMENT (symbolP, bfd_com_section_ptr); - s->n_type = BFD_MACH_O_N_UNDF | BFD_MACH_O_N_EXT; - } - - /* This is a data object (whatever we choose that to mean). */ - s->symbol.flags |= BSF_OBJECT; - - /* We've set symbol qualifiers, so validate if you can. */ - s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; - - return symbolP; -} - -static void -obj_mach_o_comm (int is_local) -{ - s_comm_internal (is_local, obj_mach_o_common_parse); -} - -/* Set properties that apply to the whole file. At present, the only - one defined, is subsections_via_symbols. */ - -typedef enum obj_mach_o_file_properties { - OBJ_MACH_O_FILE_PROP_NONE = 0, - OBJ_MACH_O_FILE_PROP_SUBSECTS_VIA_SYMS, - OBJ_MACH_O_FILE_PROP_MAX -} obj_mach_o_file_properties; - -static void -obj_mach_o_fileprop (int prop) -{ - if (prop < 0 || prop >= OBJ_MACH_O_FILE_PROP_MAX) - as_fatal (_("internal error: bad file property ID %d"), prop); - - switch ((obj_mach_o_file_properties) prop) - { - case OBJ_MACH_O_FILE_PROP_SUBSECTS_VIA_SYMS: - obj_mach_o_subsections_by_symbols = 1; - if (!bfd_set_private_flags (stdoutput, - BFD_MACH_O_MH_SUBSECTIONS_VIA_SYMBOLS)) - as_bad (_("failed to set subsections by symbols")); - demand_empty_rest_of_line (); - break; - default: - break; - } -} - -/* Temporary markers for symbol reference data. - Lazy will remain in place. */ -#define LAZY 0x01 -#define REFE 0x02 - -/* We have a bunch of qualifiers that may be applied to symbols. - .globl is handled here so that we might make sure that conflicting qualifiers - are caught where possible. */ - -typedef enum obj_mach_o_symbol_type { - OBJ_MACH_O_SYM_UNK = 0, - OBJ_MACH_O_SYM_LOCAL = 1, - OBJ_MACH_O_SYM_GLOBL = 2, - OBJ_MACH_O_SYM_REFERENCE = 3, - OBJ_MACH_O_SYM_WEAK_REF = 4, - OBJ_MACH_O_SYM_LAZY_REF = 5, - OBJ_MACH_O_SYM_WEAK_DEF = 6, - OBJ_MACH_O_SYM_PRIV_EXT = 7, - OBJ_MACH_O_SYM_NO_DEAD_STRIP = 8, - OBJ_MACH_O_SYM_WEAK = 9 -} obj_mach_o_symbol_type; - -/* Set Mach-O-specific symbol qualifiers. */ - -static int -obj_mach_o_set_symbol_qualifier (symbolS *sym, int type) -{ - int is_defined; - bfd_mach_o_asymbol *s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (sym); - bfd_mach_o_section *sec; - int sectype = -1; - int err = 0; - - /* If the symbol is defined, then we can do more rigorous checking on - the validity of the qualifiers. Otherwise, we are stuck with waiting - until it's defined - or until write the file. - - In certain cases (e.g. when a symbol qualifier is intended to introduce - an undefined symbol in a stubs section) we should check that the current - section is appropriate to the qualifier. */ - - is_defined = s->symbol.section != bfd_und_section_ptr; - if (is_defined) - sec = bfd_mach_o_get_mach_o_section (s->symbol.section) ; - else - sec = bfd_mach_o_get_mach_o_section (now_seg) ; - - if (sec != NULL) - sectype = sec->flags & BFD_MACH_O_SECTION_TYPE_MASK; - - switch ((obj_mach_o_symbol_type) type) - { - case OBJ_MACH_O_SYM_LOCAL: - /* This is an extension over the system tools. */ - if (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT)) - { - as_bad (_("'%s' previously declared as '%s'."), s->symbol.name, - (s->n_type & BFD_MACH_O_N_PEXT) ? "private extern" - : "global" ); - err = 1; - } - else - { - s->n_type &= ~BFD_MACH_O_N_EXT; - S_CLEAR_EXTERNAL (sym); - } - break; - - case OBJ_MACH_O_SYM_PRIV_EXT: - s->n_type |= BFD_MACH_O_N_PEXT ; - s->n_desc &= ~LAZY; /* The native tool switches this off too. */ - /* We follow the system tools in marking PEXT as also global. */ - /* Fall through. */ - - case OBJ_MACH_O_SYM_GLOBL: - /* It's not an error to define a symbol and then make it global. */ - s->n_type |= BFD_MACH_O_N_EXT; - S_SET_EXTERNAL (sym); - break; - - case OBJ_MACH_O_SYM_REFERENCE: - if (is_defined) - s->n_desc |= BFD_MACH_O_N_NO_DEAD_STRIP; - else - s->n_desc |= (REFE | BFD_MACH_O_N_NO_DEAD_STRIP); - break; - - case OBJ_MACH_O_SYM_LAZY_REF: - if (is_defined) - s->n_desc |= BFD_MACH_O_N_NO_DEAD_STRIP; - else - s->n_desc |= (REFE | LAZY | BFD_MACH_O_N_NO_DEAD_STRIP); - break; - - /* Force ld to retain the symbol - even if it appears unused. */ - case OBJ_MACH_O_SYM_NO_DEAD_STRIP: - s->n_desc |= BFD_MACH_O_N_NO_DEAD_STRIP ; - break; - - /* Mach-O's idea of weak ... */ - case OBJ_MACH_O_SYM_WEAK_REF: - s->n_desc |= BFD_MACH_O_N_WEAK_REF ; - break; - - case OBJ_MACH_O_SYM_WEAK_DEF: - if (is_defined && sectype != BFD_MACH_O_S_COALESCED) - { - as_bad (_("'%s' can't be a weak_definition (currently only" - " supported in sections of type coalesced)"), - s->symbol.name); - err = 1; - } - else - s->n_desc |= BFD_MACH_O_N_WEAK_DEF; - break; - - case OBJ_MACH_O_SYM_WEAK: - /* A generic 'weak' - we try to figure out what it means at - symbol frob time. */ - S_SET_WEAK (sym); - break; - - default: - break; - } - - /* We've seen some kind of qualifier - check validity if or when the entity - is defined. */ - s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; - return err; -} - -/* Respond to symbol qualifiers. - All of the form: - .<qualifier> symbol [, symbol]* - a list of symbols is an extension over the Darwin system as. */ - -static void -obj_mach_o_sym_qual (int ntype) -{ - char *name; - char c; - symbolS *symbolP; - -#ifdef md_flush_pending_output - md_flush_pending_output (); -#endif - - do - { - name = input_line_pointer; - c = get_symbol_end (); - symbolP = symbol_find_or_make (name); - obj_mach_o_set_symbol_qualifier (symbolP, ntype); - *input_line_pointer = c; - SKIP_WHITESPACE (); - c = *input_line_pointer; - if (c == ',') - { - input_line_pointer++; - SKIP_WHITESPACE (); - if (is_end_of_line[(unsigned char) *input_line_pointer]) - c = '\n'; - } - } - while (c == ','); - - demand_empty_rest_of_line (); -} - -typedef struct obj_mach_o_indirect_sym -{ - symbolS *sym; - segT sect; - struct obj_mach_o_indirect_sym *next; -} obj_mach_o_indirect_sym; - -/* We store in order an maintain a pointer to the last one - to save reversing - later. */ -obj_mach_o_indirect_sym *indirect_syms; -obj_mach_o_indirect_sym *indirect_syms_tail; - -static void -obj_mach_o_indirect_symbol (int arg ATTRIBUTE_UNUSED) -{ - bfd_mach_o_section *sec = bfd_mach_o_get_mach_o_section (now_seg); - -#ifdef md_flush_pending_output - md_flush_pending_output (); -#endif - - if (obj_mach_o_is_static) - as_bad (_("use of .indirect_symbols requires `-dynamic'")); - - switch (sec->flags & BFD_MACH_O_SECTION_TYPE_MASK) - { - case BFD_MACH_O_S_SYMBOL_STUBS: - case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS: - case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS: - { - obj_mach_o_indirect_sym *isym; - char *name = input_line_pointer; - char c = get_symbol_end (); - symbolS *sym = symbol_find_or_make (name); - unsigned int elsize = - bfd_mach_o_section_get_entry_size (stdoutput, sec); - - if (elsize == 0) - { - as_bad (_("attempt to add an indirect_symbol to a stub or" - " reference section with a zero-sized element at %s"), - name); - *input_line_pointer = c; - ignore_rest_of_line (); - return; - } - *input_line_pointer = c; - - /* The indirect symbols are validated after the symbol table is - frozen, we must make sure that if a local symbol is used as an - indirect, it is promoted to a 'real' one. Fetching the bfd sym - achieves this. */ - symbol_get_bfdsym (sym); - isym = (obj_mach_o_indirect_sym *) - xmalloc (sizeof (obj_mach_o_indirect_sym)); - - /* Just record the data for now, we will validate it when we - compute the output in obj_mach_o_set_indirect_symbols. */ - isym->sym = sym; - isym->sect = now_seg; - isym->next = NULL; - if (indirect_syms == NULL) - indirect_syms = isym; - else - indirect_syms_tail->next = isym; - indirect_syms_tail = isym; - } - break; - - default: - as_bad (_("an .indirect_symbol must be in a symbol pointer" - " or stub section.")); - ignore_rest_of_line (); - return; - } - demand_empty_rest_of_line (); -} - -const pseudo_typeS mach_o_pseudo_table[] = -{ - /* Section directives. */ - { "comm", obj_mach_o_comm, 0 }, - { "lcomm", obj_mach_o_comm, 1 }, - - { "text", obj_mach_o_base_section, 1}, - { "data", obj_mach_o_base_section, 2}, - { "bss", obj_mach_o_base_section, 3}, /* extension */ - - { "const", obj_mach_o_known_section, 1}, - { "static_const", obj_mach_o_known_section, 2}, - { "cstring", obj_mach_o_known_section, 3}, - { "literal4", obj_mach_o_known_section, 4}, - { "literal8", obj_mach_o_known_section, 5}, - { "literal16", obj_mach_o_known_section, 6}, - { "constructor", obj_mach_o_known_section, 7}, - { "destructor", obj_mach_o_known_section, 8}, - { "eh_frame", obj_mach_o_known_section, 9}, - - { "const_data", obj_mach_o_known_section, 10}, - { "static_data", obj_mach_o_known_section, 11}, - { "mod_init_func", obj_mach_o_known_section, 12}, - { "mod_term_func", obj_mach_o_known_section, 13}, - { "dyld", obj_mach_o_known_section, 14}, - { "cfstring", obj_mach_o_known_section, 15}, - - { "objc_class", obj_mach_o_objc_section, 1}, - { "objc_meta_class", obj_mach_o_objc_section, 2}, - { "objc_cat_cls_meth", obj_mach_o_objc_section, 3}, - { "objc_cat_inst_meth", obj_mach_o_objc_section, 4}, - { "objc_protocol", obj_mach_o_objc_section, 5}, - { "objc_string_object", obj_mach_o_objc_section, 6}, - { "objc_cls_meth", obj_mach_o_objc_section, 7}, - { "objc_inst_meth", obj_mach_o_objc_section, 8}, - { "objc_cls_refs", obj_mach_o_objc_section, 9}, - { "objc_message_refs", obj_mach_o_objc_section, 10}, - { "objc_symbols", obj_mach_o_objc_section, 11}, - { "objc_category", obj_mach_o_objc_section, 12}, - { "objc_class_vars", obj_mach_o_objc_section, 13}, - { "objc_instance_vars", obj_mach_o_objc_section, 14}, - { "objc_module_info", obj_mach_o_objc_section, 15}, - { "objc_class_names", obj_mach_o_objc_section, 16}, /* Alias for .cstring */ - { "objc_meth_var_types", obj_mach_o_objc_section, 17}, /* Alias for .cstring */ - { "objc_meth_var_names", obj_mach_o_objc_section, 18}, /* Alias for .cstring */ - { "objc_selector_strs", obj_mach_o_objc_section, 19}, - { "objc_image_info", obj_mach_o_objc_section, 20}, /* extension. */ - { "objc_selector_fixup", obj_mach_o_objc_section, 21}, /* extension. */ - { "objc1_class_ext", obj_mach_o_objc_section, 22}, /* ObjC-1 extension. */ - { "objc1_property_list", obj_mach_o_objc_section, 23}, /* ObjC-1 extension. */ - { "objc1_protocol_ext", obj_mach_o_objc_section, 24}, /* ObjC-1 extension. */ - - { "debug_frame", obj_mach_o_debug_section, 1}, /* extension. */ - { "debug_info", obj_mach_o_debug_section, 2}, /* extension. */ - { "debug_abbrev", obj_mach_o_debug_section, 3}, /* extension. */ - { "debug_aranges", obj_mach_o_debug_section, 4}, /* extension. */ - { "debug_macinfo", obj_mach_o_debug_section, 5}, /* extension. */ - { "debug_line", obj_mach_o_debug_section, 6}, /* extension. */ - { "debug_loc", obj_mach_o_debug_section, 7}, /* extension. */ - { "debug_pubnames", obj_mach_o_debug_section, 8}, /* extension. */ - { "debug_pubtypes", obj_mach_o_debug_section, 9}, /* extension. */ - { "debug_str", obj_mach_o_debug_section, 10}, /* extension. */ - { "debug_ranges", obj_mach_o_debug_section, 11}, /* extension. */ - { "debug_macro", obj_mach_o_debug_section, 12}, /* extension. */ - - { "lazy_symbol_pointer", obj_mach_o_opt_tgt_section, 1}, - { "lazy_symbol_pointer2", obj_mach_o_opt_tgt_section, 2}, /* extension. */ - { "lazy_symbol_pointer3", obj_mach_o_opt_tgt_section, 3}, /* extension. */ - { "non_lazy_symbol_pointer", obj_mach_o_opt_tgt_section, 4}, - { "non_lazy_symbol_pointer_x86", obj_mach_o_opt_tgt_section, 5}, /* extension. */ - { "symbol_stub", obj_mach_o_opt_tgt_section, 6}, - { "symbol_stub1", obj_mach_o_opt_tgt_section, 7}, /* extension. */ - { "picsymbol_stub", obj_mach_o_opt_tgt_section, 8}, /* extension. */ - { "picsymbol_stub1", obj_mach_o_opt_tgt_section, 9}, /* extension. */ - { "picsymbol_stub2", obj_mach_o_opt_tgt_section, 4}, /* extension. */ - { "picsymbol_stub3", obj_mach_o_opt_tgt_section, 4}, /* extension. */ - - { "section", obj_mach_o_section, 0}, - { "zerofill", obj_mach_o_zerofill, 0}, - - /* Symbol qualifiers. */ - {"local", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_LOCAL}, - {"globl", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_GLOBL}, - {"reference", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_REFERENCE}, - {"weak_reference", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_WEAK_REF}, - {"lazy_reference", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_LAZY_REF}, - {"weak_definition", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_WEAK_DEF}, - {"private_extern", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_PRIV_EXT}, - {"no_dead_strip", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_NO_DEAD_STRIP}, - {"weak", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_WEAK}, /* ext */ - - { "indirect_symbol", obj_mach_o_indirect_symbol, 0}, - - /* File flags. */ - { "subsections_via_symbols", obj_mach_o_fileprop, - OBJ_MACH_O_FILE_PROP_SUBSECTS_VIA_SYMS}, - - {NULL, NULL, 0} -}; - -/* Determine the default n_type value for a symbol from its section. */ - -static unsigned -obj_mach_o_type_for_symbol (bfd_mach_o_asymbol *s) -{ - if (s->symbol.section == bfd_abs_section_ptr) - return BFD_MACH_O_N_ABS; - else if (s->symbol.section == bfd_com_section_ptr - || s->symbol.section == bfd_und_section_ptr) - return BFD_MACH_O_N_UNDF; - else - return BFD_MACH_O_N_SECT; -} - -void -obj_mach_o_frob_colon (const char *name) -{ - if (!bfd_is_local_label_name (stdoutput, name)) - { - /* A non-local label will create a new subsection, so start a new - frag. */ - frag_wane (frag_now); - frag_new (0); - } -} - -/* We need to check the correspondence between some kinds of symbols and their - sections. Common and BSS vars will seen via the obj_macho_comm() function. - - The earlier we can pick up a problem, the better the diagnostics will be. - - However, when symbol type information is attached, the symbol section will - quite possibly be unknown. So we are stuck with checking (most of the) - validity at the time the file is written (unfortunately, then one doesn't - get line number information in the diagnostic). */ - -/* Here we pick up the case where symbol qualifiers have been applied that - are possibly incompatible with the section etc. that the symbol is defined - in. */ - -void obj_mach_o_frob_label (struct symbol *sp) -{ - bfd_mach_o_asymbol *s; - unsigned base_type; - bfd_mach_o_section *sec; - int sectype = -1; - - if (!bfd_is_local_label_name (stdoutput, S_GET_NAME (sp))) - { - /* If this is a non-local label, it should have started a new sub- - section. */ - gas_assert (frag_now->obj_frag_data.subsection == NULL); - frag_now->obj_frag_data.subsection = sp; - } - - /* Leave local symbols alone. */ - - if (S_IS_LOCAL (sp)) - return; - - s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (sp); - /* Leave debug symbols alone. */ - if ((s->n_type & BFD_MACH_O_N_STAB) != 0) - return; - - /* This is the base symbol type, that we mask in. */ - base_type = obj_mach_o_type_for_symbol (s); - - sec = bfd_mach_o_get_mach_o_section (s->symbol.section); - if (sec != NULL) - sectype = sec->flags & BFD_MACH_O_SECTION_TYPE_MASK; - - /* If there is a pre-existing qualifier, we can make some checks about - validity now. */ - - if(s->symbol.udata.i == SYM_MACHO_FIELDS_NOT_VALIDATED) - { - if ((s->n_desc & BFD_MACH_O_N_WEAK_DEF) - && sectype != BFD_MACH_O_S_COALESCED) - as_bad (_("'%s' can't be a weak_definition (currently only supported" - " in sections of type coalesced)"), s->symbol.name); - - /* Have we changed from an undefined to defined ref? */ - s->n_desc &= ~(REFE | LAZY); - } - - s->n_type &= ~BFD_MACH_O_N_TYPE; - s->n_type |= base_type; -} - -/* This is the fall-back, we come here when we get to the end of the file and - the symbol is not defined - or there are combinations of qualifiers required - (e.g. global + weak_def). */ - -int -obj_mach_o_frob_symbol (struct symbol *sp) -{ - bfd_mach_o_asymbol *s; - unsigned base_type; - bfd_mach_o_section *sec; - int sectype = -1; - - /* Leave local symbols alone. */ - if (S_IS_LOCAL (sp)) - return 0; - - s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (sp); - /* Leave debug symbols alone. */ - if ((s->n_type & BFD_MACH_O_N_STAB) != 0) - return 0; - - base_type = obj_mach_o_type_for_symbol (s); - sec = bfd_mach_o_get_mach_o_section (s->symbol.section); - if (sec != NULL) - sectype = sec->flags & BFD_MACH_O_SECTION_TYPE_MASK; - - if (s->symbol.section == bfd_und_section_ptr) - { - /* ??? Do we really gain much from implementing this as well as the - mach-o specific ones? */ - if (s->symbol.flags & BSF_WEAK) - s->n_desc |= BFD_MACH_O_N_WEAK_REF; - - /* Undefined syms, become extern. */ - s->n_type |= BFD_MACH_O_N_EXT; - S_SET_EXTERNAL (sp); - } - else if (s->symbol.section == bfd_com_section_ptr) - { - /* ... so do comm. */ - s->n_type |= BFD_MACH_O_N_EXT; - S_SET_EXTERNAL (sp); - } - else - { - if ((s->symbol.flags & BSF_WEAK) - && (sectype == BFD_MACH_O_S_COALESCED) - && (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT))) - s->n_desc |= BFD_MACH_O_N_WEAK_DEF; -/* ??? we should do this - but then that reveals that the semantics of weak - are different from what's supported in mach-o object files. - else - as_bad (_("'%s' can't be a weak_definition."), - s->symbol.name); */ - } - - if (s->symbol.udata.i == SYM_MACHO_FIELDS_UNSET) - { - /* Anything here that should be added that is non-standard. */ - s->n_desc &= ~BFD_MACH_O_REFERENCE_MASK; - s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; - } - else if (s->symbol.udata.i == SYM_MACHO_FIELDS_NOT_VALIDATED) - { - /* Try to validate any combinations. */ - if (s->n_desc & BFD_MACH_O_N_WEAK_DEF) - { - if (s->symbol.section == bfd_und_section_ptr) - as_bad (_("'%s' can't be a weak_definition (since it is" - " undefined)"), s->symbol.name); - else if (sectype != BFD_MACH_O_S_COALESCED) - as_bad (_("'%s' can't be a weak_definition (currently only supported" - " in sections of type coalesced)"), s->symbol.name); - else if (! (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT))) - as_bad (_("Non-global symbol: '%s' can't be a weak_definition."), - s->symbol.name); - } - - } - else - as_bad (_("internal error: [%s] unexpected code [%lx] in frob symbol"), - s->symbol.name, (unsigned long)s->symbol.udata.i); - - s->n_type &= ~BFD_MACH_O_N_TYPE; - s->n_type |= base_type; - - if (s->symbol.flags & BSF_GLOBAL) - s->n_type |= BFD_MACH_O_N_EXT; - - /* This cuts both ways - we promote some things to external above. */ - if (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT)) - S_SET_EXTERNAL (sp); - - return 0; -} - -/* Support stabs for mach-o. */ - -void -obj_mach_o_process_stab (int what, const char *string, - int type, int other, int desc) -{ - symbolS *symbolP; - bfd_mach_o_asymbol *s; - - switch (what) - { - case 'd': - symbolP = symbol_new ("", now_seg, frag_now_fix (), frag_now); - /* Special stabd NULL name indicator. */ - S_SET_NAME (symbolP, NULL); - break; - - case 'n': - case 's': - symbolP = symbol_new (string, undefined_section, (valueT) 0, - &zero_address_frag); - pseudo_set (symbolP); - break; - - default: - as_bad(_("unrecognized stab type '%c'"), (char)what); - abort (); - break; - } - - s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (symbolP); - s->n_type = type; - s->n_desc = desc; - /* For stabd, this will eventually get overwritten by the section number. */ - s->n_sect = other; - - /* It's a debug symbol. */ - s->symbol.flags |= BSF_DEBUGGING; - - /* We've set it - so check it, if you can, but don't try to create the - flags. */ - s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; -} - -/* This is a place to check for any errors that we can't detect until we know - what remains undefined at the end of assembly. */ - -static void -obj_mach_o_check_before_writing (bfd *abfd ATTRIBUTE_UNUSED, - asection *sec, - void *unused ATTRIBUTE_UNUSED) -{ - fixS *fixP; - struct frchain *frchp; - segment_info_type *seginfo = seg_info (sec); - - if (seginfo == NULL) - return; - - /* We are not allowed subtractions where either of the operands is - undefined. So look through the frags for any fixes to check. */ - for (frchp = seginfo->frchainP; frchp != NULL; frchp = frchp->frch_next) - for (fixP = frchp->fix_root; fixP != NULL; fixP = fixP->fx_next) - { - if (fixP->fx_addsy != NULL - && fixP->fx_subsy != NULL - && (! S_IS_DEFINED (fixP->fx_addsy) - || ! S_IS_DEFINED (fixP->fx_subsy))) - { - segT add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy); - segT sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy); - - if (! S_IS_DEFINED (fixP->fx_addsy) - && S_IS_DEFINED (fixP->fx_subsy)) - { - as_bad_where (fixP->fx_file, fixP->fx_line, - _("`%s' can't be undefined in `%s' - `%s' {%s section}"), - S_GET_NAME (fixP->fx_addsy), S_GET_NAME (fixP->fx_addsy), - S_GET_NAME (fixP->fx_subsy), segment_name (sub_symbol_segment)); - } - else if (! S_IS_DEFINED (fixP->fx_subsy) - && S_IS_DEFINED (fixP->fx_addsy)) - { - as_bad_where (fixP->fx_file, fixP->fx_line, - _("`%s' can't be undefined in `%s' {%s section} - `%s'"), - S_GET_NAME (fixP->fx_subsy), S_GET_NAME (fixP->fx_addsy), - segment_name (add_symbol_segment), S_GET_NAME (fixP->fx_subsy)); - } - else - { - as_bad_where (fixP->fx_file, fixP->fx_line, - _("`%s' and `%s' can't be undefined in `%s' - `%s'"), - S_GET_NAME (fixP->fx_addsy), S_GET_NAME (fixP->fx_subsy), - S_GET_NAME (fixP->fx_addsy), S_GET_NAME (fixP->fx_subsy)); - } - } - } -} - -/* Do any checks that we can't complete without knowing what's undefined. */ -void -obj_mach_o_pre_output_hook (void) -{ - bfd_map_over_sections (stdoutput, obj_mach_o_check_before_writing, (char *) 0); -} - -/* Here we count up frags in each subsection (where a sub-section is defined - as starting with a non-local symbol). - Note that, if there are no non-local symbols in a section, all the frags will - be attached as one anonymous subsection. */ - -static void -obj_mach_o_set_subsections (bfd *abfd ATTRIBUTE_UNUSED, - asection *sec, - void *unused ATTRIBUTE_UNUSED) -{ - segment_info_type *seginfo = seg_info (sec); - symbolS *cur_subsection = NULL; - struct obj_mach_o_symbol_data *cur_subsection_data = NULL; - fragS *frag; - frchainS *chain; - - /* Protect against sections not created by gas. */ - if (seginfo == NULL) - return; - - /* Attach every frag to a subsection. */ - for (chain = seginfo->frchainP; chain != NULL; chain = chain->frch_next) - for (frag = chain->frch_root; frag != NULL; frag = frag->fr_next) - { - if (frag->obj_frag_data.subsection == NULL) - frag->obj_frag_data.subsection = cur_subsection; - else - { - cur_subsection = frag->obj_frag_data.subsection; - cur_subsection_data = symbol_get_obj (cur_subsection); - cur_subsection_data->subsection_size = 0; - } - if (cur_subsection_data != NULL) - { - /* Update subsection size. */ - cur_subsection_data->subsection_size += frag->fr_fix; - } - } -} - -/* Handle mach-o subsections-via-symbols counting up frags belonging to each - sub-section. */ - -void -obj_mach_o_pre_relax_hook (void) -{ - bfd_map_over_sections (stdoutput, obj_mach_o_set_subsections, (char *) 0); -} - -/* Zerofill and GB Zerofill sections must be sorted to follow all other - sections in their segments. - - The native 'as' leaves the sections physically in the order they appear in - the source, and adjusts the section VMAs to meet the constraint. - - We follow this for now - if nothing else, it makes comparison easier. - - An alternative implementation would be to sort the sections as ld requires. - It might be advantageous to implement such a scheme in the future (or even - to make the style of section ordering user-selectable). */ - -typedef struct obj_mach_o_set_vma_data -{ - bfd_vma vma; - unsigned vma_pass; - unsigned zerofill_seen; - unsigned gb_zerofill_seen; -} obj_mach_o_set_vma_data; - -/* We do (possibly) three passes through to set the vma, so that: - - zerofill sections get VMAs after all others in their segment - GB zerofill get VMAs last. - - As we go, we notice if we see any Zerofill or GB Zerofill sections, so that - we can skip the additional passes if there's nothing to do. */ - -static void -obj_mach_o_set_section_vma (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *v_p) -{ - bfd_mach_o_section *ms = bfd_mach_o_get_mach_o_section (sec); - unsigned bfd_align = bfd_get_section_alignment (abfd, sec); - obj_mach_o_set_vma_data *p = (struct obj_mach_o_set_vma_data *)v_p; - unsigned sectype = (ms->flags & BFD_MACH_O_SECTION_TYPE_MASK); - unsigned zf; - - zf = 0; - if (sectype == BFD_MACH_O_S_ZEROFILL) - { - zf = 1; - p->zerofill_seen = zf; - } - else if (sectype == BFD_MACH_O_S_GB_ZEROFILL) - { - zf = 2; - p->gb_zerofill_seen = zf; - } - - if (p->vma_pass != zf) - return; - - /* We know the section size now - so make a vma for the section just - based on order. */ - ms->size = bfd_get_section_size (sec); - - /* Make sure that the align agrees, and set to the largest value chosen. */ - ms->align = ms->align > bfd_align ? ms->align : bfd_align; - bfd_set_section_alignment (abfd, sec, ms->align); - - p->vma += (1 << ms->align) - 1; - p->vma &= ~((1 << ms->align) - 1); - ms->addr = p->vma; - bfd_set_section_vma (abfd, sec, p->vma); - p->vma += ms->size; -} - -/* (potentially) three passes over the sections, setting VMA. We skip the - {gb}zerofill passes if we didn't see any of the relevant sections. */ - -void obj_mach_o_post_relax_hook (void) -{ - obj_mach_o_set_vma_data d; - - memset (&d, 0, sizeof (d)); - - bfd_map_over_sections (stdoutput, obj_mach_o_set_section_vma, (char *) &d); - if ((d.vma_pass = d.zerofill_seen) != 0) - bfd_map_over_sections (stdoutput, obj_mach_o_set_section_vma, (char *) &d); - if ((d.vma_pass = d.gb_zerofill_seen) != 0) - bfd_map_over_sections (stdoutput, obj_mach_o_set_section_vma, (char *) &d); -} - -static void -obj_mach_o_set_indirect_symbols (bfd *abfd, asection *sec, - void *xxx ATTRIBUTE_UNUSED) -{ - bfd_vma sect_size = bfd_section_size (abfd, sec); - bfd_mach_o_section *ms = bfd_mach_o_get_mach_o_section (sec); - unsigned lazy = 0; - - /* See if we have any indirect syms to consider. */ - if (indirect_syms == NULL) - return; - - /* Process indirect symbols. - Check for errors, if OK attach them as a flat array to the section - for which they are defined. */ - - switch (ms->flags & BFD_MACH_O_SECTION_TYPE_MASK) - { - case BFD_MACH_O_S_SYMBOL_STUBS: - case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS: - lazy = LAZY; - /* Fall through. */ - case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS: - { - unsigned int nactual = 0; - unsigned int ncalc; - obj_mach_o_indirect_sym *isym; - obj_mach_o_indirect_sym *list = NULL; - obj_mach_o_indirect_sym *list_tail = NULL; - unsigned long eltsiz = - bfd_mach_o_section_get_entry_size (abfd, ms); - - for (isym = indirect_syms; isym != NULL; isym = isym->next) - { - if (isym->sect == sec) - { - nactual++; - if (list == NULL) - list = isym; - else - list_tail->next = isym; - list_tail = isym; - } - } - - /* If none are in this section, stop here. */ - if (nactual == 0) - break; - - /* If we somehow added indirect symbols to a section with a zero - entry size, we're dead ... */ - gas_assert (eltsiz != 0); - - ncalc = (unsigned int) (sect_size / eltsiz); - if (nactual != ncalc) - as_bad (_("the number of .indirect_symbols defined in section %s" - " does not match the number expected (%d defined, %d" - " expected)"), sec->name, nactual, ncalc); - else - { - unsigned n; - bfd_mach_o_asymbol *sym; - ms->indirect_syms = - bfd_zalloc (abfd, - nactual * sizeof (bfd_mach_o_asymbol *)); - - if (ms->indirect_syms == NULL) - { - as_fatal (_("internal error: failed to allocate %d indirect" - "symbol pointers"), nactual); - } - - for (isym = list, n = 0; isym != NULL; isym = isym->next, n++) - { - sym = (bfd_mach_o_asymbol *)symbol_get_bfdsym (isym->sym); - /* Array is init to NULL & NULL signals a local symbol - If the section is lazy-bound, we need to keep the - reference to the symbol, since dyld can override. - - Absolute symbols are handled specially. */ - if (sym->symbol.section == bfd_abs_section_ptr) - ms->indirect_syms[n] = sym; - else if (S_IS_LOCAL (isym->sym) && ! lazy) - ; - else - { - if (sym == NULL) - ; - /* If the symbols is external ... */ - else if (S_IS_EXTERNAL (isym->sym) - || (sym->n_type & BFD_MACH_O_N_EXT) - || ! S_IS_DEFINED (isym->sym) - || lazy) - { - sym->n_desc &= ~LAZY; - /* ... it can be lazy, if not defined or hidden. */ - if ((sym->n_type & BFD_MACH_O_N_TYPE) - == BFD_MACH_O_N_UNDF - && ! (sym->n_type & BFD_MACH_O_N_PEXT) - && (sym->n_type & BFD_MACH_O_N_EXT)) - sym->n_desc |= lazy; - ms->indirect_syms[n] = sym; - } - } - } - } - } - break; - - default: - break; - } -} - -/* The process of relocation could alter what's externally visible, thus we - leave setting the indirect symbols until last. */ - -void -obj_mach_o_frob_file_after_relocs (void) -{ - bfd_map_over_sections (stdoutput, obj_mach_o_set_indirect_symbols, (char *) 0); -} - -/* Reverse relocations order to make ld happy. */ - -void -obj_mach_o_reorder_section_relocs (asection *sec, arelent **rels, unsigned int n) -{ - unsigned int i; - unsigned int max = n / 2; - - for (i = 0; i < max; i++) - { - arelent *r = rels[i]; - rels[i] = rels[n - i - 1]; - rels[n - i - 1] = r; - } - bfd_set_reloc (stdoutput, sec, rels, n); -} - -/* Relocation rules are different in frame sections. */ - -static int -obj_mach_o_is_frame_section (segT sec) -{ - int l; - l = strlen (segment_name (sec)); - if ((l == 9 && strncmp (".eh_frame", segment_name (sec), 9) == 0) - || (l == 12 && strncmp (".debug_frame", segment_name (sec), 12) == 0)) - return 1; - return 0; -} - -/* Unless we're in a frame section, we need to force relocs to be generated for - local subtractions. We might eliminate them later (if they are within the - same sub-section) but we don't know that at the point that this decision is - being made. */ - -int -obj_mach_o_allow_local_subtract (expressionS * left ATTRIBUTE_UNUSED, - expressionS * right ATTRIBUTE_UNUSED, - segT seg) -{ - /* Don't interfere if it's one of the GAS internal sections. */ - if (! SEG_NORMAL (seg)) - return 1; - - /* Allow in frame sections, otherwise emit a reloc. */ - return obj_mach_o_is_frame_section (seg); -} - -int -obj_mach_o_in_different_subsection (symbolS *a, symbolS *b) -{ - fragS *fa; - fragS *fb; - - if (S_GET_SEGMENT (a) != S_GET_SEGMENT (b) - || !S_IS_DEFINED (a) - || !S_IS_DEFINED (b)) - { - /* Not in the same segment, or undefined symbol. */ - return 1; - } - - fa = symbol_get_frag (a); - fb = symbol_get_frag (b); - if (fa == NULL || fb == NULL) - { - /* One of the symbols is not in a subsection. */ - return 1; - } - - return fa->obj_frag_data.subsection != fb->obj_frag_data.subsection; -} - -int -obj_mach_o_force_reloc_sub_same (fixS *fix, segT seg) -{ - if (! SEG_NORMAL (seg)) - return 1; - return obj_mach_o_in_different_subsection (fix->fx_addsy, fix->fx_subsy); -} - -int -obj_mach_o_force_reloc_sub_local (fixS *fix, segT seg ATTRIBUTE_UNUSED) -{ - return obj_mach_o_in_different_subsection (fix->fx_addsy, fix->fx_subsy); -} - -int -obj_mach_o_force_reloc (fixS *fix) -{ - if (generic_force_reloc (fix)) - return 1; - - /* Force a reloc if the target is not in the same subsection. - FIXME: handle (a - b) where a and b belongs to the same subsection ? */ - if (fix->fx_addsy != NULL) - { - symbolS *subsec = fix->fx_frag->obj_frag_data.subsection; - symbolS *targ = fix->fx_addsy; - - /* There might be no subsections at all. */ - if (subsec == NULL) - return 0; - - if (S_GET_SEGMENT (targ) == absolute_section) - return 0; - - return obj_mach_o_in_different_subsection (targ, subsec); - } - return 0; -} |