diff options
Diffstat (limited to 'bfd/section.c')
| -rw-r--r-- | bfd/section.c | 306 |
1 files changed, 165 insertions, 141 deletions
diff --git a/bfd/section.c b/bfd/section.c index 5d13335..e9fbcf9 100644 --- a/bfd/section.c +++ b/bfd/section.c @@ -46,7 +46,7 @@ SUBSECTION Each section has a name which describes the section in the outside world---for example, <<a.out>> would contain at least - three sections, called <<.text>>, <<.data>> and <<.bss>>. + three sections, called <<.text>>, <<.data>> and <<.bss>>. Names need not be unique; for example a COFF file may have several sections named <<.data>>. @@ -78,7 +78,7 @@ SUBSECTION To write a new object style BFD, the various sections to be written have to be created. They are attached to the BFD in the same way as input sections; data is written to the - sections using <<bfd_set_section_contents>>. + sections using <<bfd_set_section_contents>>. Any program that creates or combines sections (e.g., the assembler and linker) must use the <<asection>> fields <<output_section>> and @@ -149,7 +149,7 @@ SUBSECTION CODE_FRAGMENT . -.typedef struct sec +.typedef struct sec .{ . {* The name of the section; the name isn't a copy, the pointer is . the same as that passed to bfd_make_section. *} @@ -158,7 +158,7 @@ CODE_FRAGMENT . . {* Which section is it; 0..nth. *} . -. int index; +. int index; . . {* The next section in the list belonging to the BFD, or NULL. *} . @@ -166,7 +166,7 @@ CODE_FRAGMENT . . {* The field flags contains attributes of the section. Some . flags are read in from the object file, and some are -. synthesized from other information. *} +. synthesized from other information. *} . . flagword flags; . @@ -176,7 +176,7 @@ CODE_FRAGMENT . This is clear for a section containing debug information . only. *} .#define SEC_ALLOC 0x001 -. +. . {* Tells the OS to load the section from the file when loading. . This is clear for a .bss section. *} .#define SEC_LOAD 0x002 @@ -247,6 +247,12 @@ CODE_FRAGMENT . discarded. *} .#define SEC_DEBUGGING 0x10000 . +. {* The contents of this section are held in memory pointed to +. by the contents field. This is checked by +. bfd_get_section_contents, and the data is retrieved from +. memory if appropriate. *} +.#define SEC_IN_MEMORY 0x20000 +. . {* End of section flags. *} . . {* The virtual memory address of the section - where it will be @@ -269,13 +275,13 @@ CODE_FRAGMENT . contains a value even if the section has no contents (e.g., the . size of <<.bss>>). This will be filled in after relocation *} . -. bfd_size_type _cooked_size; +. bfd_size_type _cooked_size; . . {* The original size on disk of the section, in bytes. Normally this . value is the same as the size, but if some relaxing has . been done, then this value will be bigger. *} . -. bfd_size_type _raw_size; +. bfd_size_type _raw_size; . . {* If this section is going to be output, then this value is the . offset into the output section of the first byte in the input @@ -312,8 +318,8 @@ CODE_FRAGMENT . . {* File position of section data *} . -. file_ptr filepos; -. +. file_ptr filepos; +. . {* File position of relocation info *} . . file_ptr rel_filepos; @@ -326,12 +332,14 @@ CODE_FRAGMENT . . PTR userdata; . -. struct lang_output_section *otheruserdata; +. {* If the SEC_IN_MEMORY flag is set, this points to the actual +. contents. *} +. unsigned char *contents; . . {* Attached line number information *} . . alent *lineno; -. +. . {* Number of line number records *} . . unsigned int lineno_count; @@ -358,7 +366,7 @@ CODE_FRAGMENT . . boolean reloc_done; . {* A symbol which points at this section only *} -. struct symbol_cache_entry *symbol; +. struct symbol_cache_entry *symbol; . struct symbol_cache_entry **symbol_ptr_ptr; . . struct bfd_link_order *link_order_head; @@ -395,12 +403,13 @@ CODE_FRAGMENT /* These symbols are global, not specific to any BFD. Therefore, anything that tries to change them is broken, and should be repaired. */ -static CONST asymbol global_syms[] = { - /* the_bfd, name, value, attr, section [, udata] */ - { 0, BFD_COM_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_com_section }, - { 0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_und_section }, - { 0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_abs_section }, - { 0, BFD_IND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_ind_section }, +static CONST asymbol global_syms[] = +{ + /* the_bfd, name, value, attr, section [, udata] */ + {0, BFD_COM_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_com_section}, + {0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_und_section}, + {0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_abs_section}, + {0, BFD_IND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_ind_section}, }; #define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \ @@ -426,7 +435,7 @@ These are the functions exported by the section handling part of BFD. */ /* -FUNCTION +FUNCTION bfd_get_section_by_name SYNOPSIS @@ -444,14 +453,15 @@ DESCRIPTION */ asection * -DEFUN(bfd_get_section_by_name,(abfd, name), - bfd *abfd AND - CONST char *name) +bfd_get_section_by_name (abfd, name) + bfd *abfd; + CONST char *name; { asection *sect; for (sect = abfd->sections; sect != NULL; sect = sect->next) - if (!strcmp (sect->name, name)) return sect; + if (!strcmp (sect->name, name)) + return sect; return NULL; } @@ -483,14 +493,14 @@ DESCRIPTION asection * -DEFUN(bfd_make_section_old_way,(abfd, name), - bfd *abfd AND - CONST char * name) +bfd_make_section_old_way (abfd, name) + bfd *abfd; + CONST char *name; { - asection *sec = bfd_get_section_by_name(abfd, name); - if (sec == (asection *)NULL) + asection *sec = bfd_get_section_by_name (abfd, name); + if (sec == (asection *) NULL) { - sec = bfd_make_section(abfd, name); + sec = bfd_make_section (abfd, name); } return sec; } @@ -505,7 +515,7 @@ SYNOPSIS DESCRIPTION Create a new empty section called @var{name} and attach it to the end of the chain of sections for @var{abfd}. Create a new section even if there - is already a section with that name. + is already a section with that name. Return <<NULL>> and set <<bfd_error>> on error; possible errors are: o <<bfd_error_invalid_operation>> - If output has already started for @var{abfd}. @@ -519,7 +529,7 @@ bfd_make_section_anyway (abfd, name) { asection *newsect; asection **prev = &abfd->sections; - asection * sect = abfd->sections; + asection *sect = abfd->sections; if (abfd->output_has_begun) { @@ -527,32 +537,35 @@ bfd_make_section_anyway (abfd, name) return NULL; } - while (sect) { - prev = §->next; - sect = sect->next; - } + while (sect) + { + prev = §->next; + sect = sect->next; + } - newsect = (asection *) bfd_zalloc(abfd, sizeof (asection)); - if (newsect == NULL) { - bfd_set_error (bfd_error_no_memory); - return NULL; - } + newsect = (asection *) bfd_zalloc (abfd, sizeof (asection)); + if (newsect == NULL) + { + bfd_set_error (bfd_error_no_memory); + return NULL; + } newsect->name = name; newsect->index = abfd->section_count++; newsect->flags = SEC_NO_FLAGS; - newsect->userdata = 0; - newsect->next = (asection *)NULL; - newsect->relocation = (arelent *)NULL; + newsect->userdata = NULL; + newsect->contents = NULL; + newsect->next = (asection *) NULL; + newsect->relocation = (arelent *) NULL; newsect->reloc_count = 0; - newsect->line_filepos =0; + newsect->line_filepos = 0; newsect->owner = abfd; /* Create a symbol whos only job is to point to this section. This is useful for things like relocs which are relative to the base of a section. */ - newsect->symbol = bfd_make_empty_symbol(abfd); + newsect->symbol = bfd_make_empty_symbol (abfd); if (!newsect) return NULL; newsect->symbol->name = name; @@ -562,10 +575,11 @@ bfd_make_section_anyway (abfd, name) newsect->symbol_ptr_ptr = &newsect->symbol; - if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) { - free (newsect); - return NULL; - } + if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) + { + free (newsect); + return NULL; + } *prev = newsect; return newsect; @@ -586,34 +600,36 @@ DESCRIPTION */ sec_ptr -DEFUN(bfd_make_section,(abfd, name), - bfd *abfd AND - CONST char * name) +bfd_make_section (abfd, name) + bfd *abfd; + CONST char *name; { - asection * sect = abfd->sections; - - if (strcmp(name, BFD_ABS_SECTION_NAME) == 0) - { - return &bfd_abs_section; - } - if (strcmp(name, BFD_COM_SECTION_NAME) == 0) - { - return &bfd_com_section; - } - if (strcmp(name, BFD_UND_SECTION_NAME) == 0) - { - return &bfd_und_section; - } - - if (strcmp(name, BFD_IND_SECTION_NAME) == 0) - { - return &bfd_ind_section; - } - - while (sect) { - if (!strcmp(sect->name, name)) return NULL; - sect = sect->next; - } + asection *sect = abfd->sections; + + if (strcmp (name, BFD_ABS_SECTION_NAME) == 0) + { + return &bfd_abs_section; + } + if (strcmp (name, BFD_COM_SECTION_NAME) == 0) + { + return &bfd_com_section; + } + if (strcmp (name, BFD_UND_SECTION_NAME) == 0) + { + return &bfd_und_section; + } + + if (strcmp (name, BFD_IND_SECTION_NAME) == 0) + { + return &bfd_ind_section; + } + + while (sect) + { + if (!strcmp (sect->name, name)) + return NULL; + sect = sect->next; + } /* The name is not already used; go ahead and make a new section. */ return bfd_make_section_anyway (abfd, name); @@ -641,10 +657,10 @@ DESCRIPTION /*ARGSUSED*/ boolean -DEFUN(bfd_set_section_flags,(abfd, section, flags), - bfd *abfd AND - sec_ptr section AND - flagword flags) +bfd_set_section_flags (abfd, section, flags) + bfd *abfd; + sec_ptr section; + flagword flags; { #if 0 /* If you try to copy a text section from an input file (where it @@ -652,10 +668,11 @@ DEFUN(bfd_set_section_flags,(abfd, section, flags), the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE set - which it doesn't, at least not for a.out. FIXME */ - if ((flags & bfd_applicable_section_flags (abfd)) != flags) { - bfd_set_error (bfd_error_invalid_operation); - return false; - } + if ((flags & bfd_applicable_section_flags (abfd)) != flags) + { + bfd_set_error (bfd_error_invalid_operation); + return false; + } #endif section->flags = flags; @@ -677,7 +694,7 @@ SYNOPSIS DESCRIPTION Call the provided function @var{func} for each section attached to the BFD @var{abfd}, passing @var{obj} as an - argument. The function will be called as if by + argument. The function will be called as if by | func(abfd, the_section, obj); @@ -693,19 +710,19 @@ DESCRIPTION /*VARARGS2*/ void -DEFUN(bfd_map_over_sections,(abfd, operation, user_storage), - bfd *abfd AND - void (*operation) PARAMS ((bfd *abfd, asection *sect, PTR obj)) AND - PTR user_storage) +bfd_map_over_sections (abfd, operation, user_storage) + bfd *abfd; + void (*operation) PARAMS ((bfd * abfd, asection * sect, PTR obj)); + PTR user_storage; { asection *sect; int i = 0; - + for (sect = abfd->sections; sect != NULL; i++, sect = sect->next) (*operation) (abfd, sect, user_storage); - if (i != abfd->section_count) /* Debugging */ - abort(); + if (i != abfd->section_count) /* Debugging */ + abort (); } @@ -718,7 +735,7 @@ SYNOPSIS DESCRIPTION Set @var{sec} to the size @var{val}. If the operation is - ok, then <<true>> is returned, else <<false>>. + ok, then <<true>> is returned, else <<false>>. Possible error returns: o <<bfd_error_invalid_operation>> - @@ -727,22 +744,23 @@ DESCRIPTION */ boolean -DEFUN(bfd_set_section_size,(abfd, ptr, val), - bfd *abfd AND - sec_ptr ptr AND - bfd_size_type val) +bfd_set_section_size (abfd, ptr, val) + bfd *abfd; + sec_ptr ptr; + bfd_size_type val; { /* Once you've started writing to any section you cannot create or change the size of any others. */ - if (abfd->output_has_begun) { - bfd_set_error (bfd_error_invalid_operation); - return false; - } + if (abfd->output_has_begun) + { + bfd_set_error (bfd_error_invalid_operation); + return false; + } ptr->_cooked_size = val; ptr->_raw_size = val; - + return true; } @@ -752,7 +770,7 @@ FUNCTION SYNOPSIS boolean bfd_set_section_contents - (bfd *abfd, + (bfd *abfd, asection *section, PTR data, file_ptr offset, @@ -763,7 +781,7 @@ DESCRIPTION Sets the contents of the section @var{section} in BFD @var{abfd} to the data starting in memory at @var{data}. The data is written to the output section starting at offset - @var{offset} for @var{count} bytes. + @var{offset} for @var{count} bytes. @@ -786,20 +804,20 @@ DESCRIPTION : bfd_get_section_size_before_reloc (sec)) boolean -DEFUN(bfd_set_section_contents,(abfd, section, location, offset, count), - bfd *abfd AND - sec_ptr section AND - PTR location AND - file_ptr offset AND - bfd_size_type count) +bfd_set_section_contents (abfd, section, location, offset, count) + bfd *abfd; + sec_ptr section; + PTR location; + file_ptr offset; + bfd_size_type count; { bfd_size_type sz; - if (!bfd_get_section_flags(abfd, section) & SEC_HAS_CONTENTS) - { - bfd_set_error (bfd_error_no_contents); - return(false); - } + if (!bfd_get_section_flags (abfd, section) & SEC_HAS_CONTENTS) + { + bfd_set_error (bfd_error_no_contents); + return (false); + } if (offset < 0) { @@ -815,28 +833,28 @@ DEFUN(bfd_set_section_contents,(abfd, section, location, offset, count), switch (abfd->direction) { - case read_direction: - case no_direction: - bfd_set_error (bfd_error_invalid_operation); - return false; + case read_direction: + case no_direction: + bfd_set_error (bfd_error_invalid_operation); + return false; - case write_direction: - break; + case write_direction: + break; - case both_direction: - /* File is opened for update. `output_has_begun' some time ago when + case both_direction: + /* File is opened for update. `output_has_begun' some time ago when the file was created. Do not recompute sections sizes or alignments in _bfd_set_section_content. */ - abfd->output_has_begun = true; - break; + abfd->output_has_begun = true; + break; } if (BFD_SEND (abfd, _bfd_set_section_contents, - (abfd, section, location, offset, count))) - { - abfd->output_has_begun = true; - return true; - } + (abfd, section, location, offset, count))) + { + abfd->output_has_begun = true; + return true; + } return false; } @@ -846,7 +864,7 @@ FUNCTION bfd_get_section_contents SYNOPSIS - boolean bfd_get_section_contents + boolean bfd_get_section_contents (bfd *abfd, asection *section, PTR location, file_ptr offset, bfd_size_type count); @@ -866,18 +884,18 @@ DESCRIPTION */ boolean -DEFUN(bfd_get_section_contents,(abfd, section, location, offset, count), - bfd *abfd AND - sec_ptr section AND - PTR location AND - file_ptr offset AND - bfd_size_type count) +bfd_get_section_contents (abfd, section, location, offset, count) + bfd *abfd; + sec_ptr section; + PTR location; + file_ptr offset; + bfd_size_type count; { bfd_size_type sz; - if (section->flags & SEC_CONSTRUCTOR) + if (section->flags & SEC_CONSTRUCTOR) { - memset(location, 0, (unsigned)count); + memset (location, 0, (unsigned) count); return true; } @@ -899,7 +917,13 @@ DEFUN(bfd_get_section_contents,(abfd, section, location, offset, count), if ((section->flags & SEC_HAS_CONTENTS) == 0) { - memset(location, 0, (unsigned)count); + memset (location, 0, (unsigned) count); + return true; + } + + if ((section->flags & SEC_IN_MEMORY) != 0) + { + memcpy (location, section->contents + offset, count); return true; } |