| /* Object file "section" support for the BFD library. |
| Copyright (C) 1990-2024 Free Software Foundation, Inc. |
| Written by Cygnus Support. |
| |
| This file is part of BFD, the Binary File Descriptor library. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| /* |
| SECTION |
| Sections |
| |
| The raw data contained within a BFD is maintained through the |
| section abstraction. A single BFD may have any number of |
| sections. It keeps hold of them by pointing to the first; |
| each one points to the next in the list. |
| |
| Sections are supported in BFD in <<section.c>>. |
| |
| @menu |
| @* Section Input:: |
| @* Section Output:: |
| @* typedef asection:: |
| @* section prototypes:: |
| @end menu |
| |
| INODE |
| Section Input, Section Output, Sections, Sections |
| SUBSECTION |
| Section input |
| |
| When a BFD is opened for reading, the section structures are |
| created and attached to the BFD. |
| |
| 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>>. |
| |
| Names need not be unique; for example a COFF file may have several |
| sections named <<.data>>. |
| |
| Sometimes a BFD will contain more than the ``natural'' number of |
| sections. A back end may attach other sections containing |
| constructor data, or an application may add a section (using |
| <<bfd_make_section>>) to the sections attached to an already open |
| BFD. For example, the linker creates an extra section |
| <<COMMON>> for each input file's BFD to hold information about |
| common storage. |
| |
| The raw data is not necessarily read in when |
| the section descriptor is created. Some targets may leave the |
| data in place until a <<bfd_get_section_contents>> call is |
| made. Other back ends may read in all the data at once. For |
| example, an S-record file has to be read once to determine the |
| size of the data. |
| |
| INODE |
| Section Output, typedef asection, Section Input, Sections |
| |
| SUBSECTION |
| Section output |
| |
| 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>>. |
| |
| Any program that creates or combines sections (e.g., the assembler |
| and linker) must use the <<asection>> fields <<output_section>> and |
| <<output_offset>> to indicate the file sections to which each |
| section must be written. (If the section is being created from |
| scratch, <<output_section>> should probably point to the section |
| itself and <<output_offset>> should probably be zero.) |
| |
| The data to be written comes from input sections attached |
| (via <<output_section>> pointers) to |
| the output sections. The output section structure can be |
| considered a filter for the input section: the output section |
| determines the vma of the output data and the name, but the |
| input section determines the offset into the output section of |
| the data to be written. |
| |
| E.g., to create a section "O", starting at 0x100, 0x123 long, |
| containing two subsections, "A" at offset 0x0 (i.e., at vma |
| 0x100) and "B" at offset 0x20 (i.e., at vma 0x120) the <<asection>> |
| structures would look like: |
| |
| | section name "A" |
| | output_offset 0x00 |
| | size 0x20 |
| | output_section -----------> section name "O" |
| | | vma 0x100 |
| | section name "B" | size 0x123 |
| | output_offset 0x20 | |
| | size 0x103 | |
| | output_section --------| |
| |
| SUBSECTION |
| Link orders |
| |
| The data within a section is stored in a @dfn{link_order}. |
| These are much like the fixups in <<gas>>. The link_order |
| abstraction allows a section to grow and shrink within itself. |
| |
| A link_order knows how big it is, and which is the next |
| link_order and where the raw data for it is; it also points to |
| a list of relocations which apply to it. |
| |
| The link_order is used by the linker to perform relaxing on |
| final code. The compiler creates code which is as big as |
| necessary to make it work without relaxing, and the user can |
| select whether to relax. Sometimes relaxing takes a lot of |
| time. The linker runs around the relocations to see if any |
| are attached to data which can be shrunk, if so it does it on |
| a link_order by link_order basis. |
| |
| */ |
| |
| #include "sysdep.h" |
| #include "bfd.h" |
| #include "libbfd.h" |
| #include "bfdlink.h" |
| |
| /* |
| DOCDD |
| INODE |
| typedef asection, section prototypes, Section Output, Sections |
| SUBSECTION |
| typedef asection |
| |
| Here is the section structure: |
| |
| EXTERNAL |
| .{* Linenumber stuff. *} |
| .typedef struct lineno_cache_entry |
| .{ |
| . unsigned int line_number; {* Linenumber from start of function. *} |
| . union |
| . { |
| . struct bfd_symbol *sym; {* Function name. *} |
| . bfd_vma offset; {* Offset into section. *} |
| . } u; |
| .} |
| .alent; |
| . |
| |
| CODE_FRAGMENT |
| .typedef struct bfd_section |
| .{ |
| . {* The name of the section; the name isn't a copy, the pointer is |
| . the same as that passed to bfd_make_section. *} |
| . const char *name; |
| . |
| . {* The next section in the list belonging to the BFD, or NULL. *} |
| . struct bfd_section *next; |
| . |
| . {* The previous section in the list belonging to the BFD, or NULL. *} |
| . struct bfd_section *prev; |
| . |
| . {* A unique sequence number. *} |
| . unsigned int id; |
| . |
| . {* A unique section number which can be used by assembler to |
| . distinguish different sections with the same section name. *} |
| . unsigned int section_id; |
| . |
| . {* Which section in the bfd; 0..n-1 as sections are created in a bfd. *} |
| . unsigned int index; |
| . |
| . {* The field flags contains attributes of the section. Some |
| . flags are read in from the object file, and some are |
| . synthesized from other information. *} |
| . flagword flags; |
| . |
| .#define SEC_NO_FLAGS 0x0 |
| . |
| . {* Tells the OS to allocate space for this section when loading. |
| . This is clear for a section containing debug information only. *} |
| .#define SEC_ALLOC 0x1 |
| . |
| . {* Tells the OS to load the section from the file when loading. |
| . This is clear for a .bss section. *} |
| .#define SEC_LOAD 0x2 |
| . |
| . {* The section contains data still to be relocated, so there is |
| . some relocation information too. *} |
| .#define SEC_RELOC 0x4 |
| . |
| . {* A signal to the OS that the section contains read only data. *} |
| .#define SEC_READONLY 0x8 |
| . |
| . {* The section contains code only. *} |
| .#define SEC_CODE 0x10 |
| . |
| . {* The section contains data only. *} |
| .#define SEC_DATA 0x20 |
| . |
| . {* The section will reside in ROM. *} |
| .#define SEC_ROM 0x40 |
| . |
| . {* The section contains constructor information. This section |
| . type is used by the linker to create lists of constructors and |
| . destructors used by <<g++>>. When a back end sees a symbol |
| . which should be used in a constructor list, it creates a new |
| . section for the type of name (e.g., <<__CTOR_LIST__>>), attaches |
| . the symbol to it, and builds a relocation. To build the lists |
| . of constructors, all the linker has to do is catenate all the |
| . sections called <<__CTOR_LIST__>> and relocate the data |
| . contained within - exactly the operations it would peform on |
| . standard data. *} |
| .#define SEC_CONSTRUCTOR 0x80 |
| . |
| . {* The section has contents - a data section could be |
| . <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>; a debug section could be |
| . <<SEC_HAS_CONTENTS>> *} |
| .#define SEC_HAS_CONTENTS 0x100 |
| . |
| . {* An instruction to the linker to not output the section |
| . even if it has information which would normally be written. *} |
| .#define SEC_NEVER_LOAD 0x200 |
| . |
| . {* The section contains thread local data. *} |
| .#define SEC_THREAD_LOCAL 0x400 |
| . |
| . {* The section's size is fixed. Generic linker code will not |
| . recalculate it and it is up to whoever has set this flag to |
| . get the size right. *} |
| .#define SEC_FIXED_SIZE 0x800 |
| . |
| . {* The section contains common symbols (symbols may be defined |
| . multiple times, the value of a symbol is the amount of |
| . space it requires, and the largest symbol value is the one |
| . used). Most targets have exactly one of these (which we |
| . translate to bfd_com_section_ptr), but ECOFF has two. *} |
| .#define SEC_IS_COMMON 0x1000 |
| . |
| . {* The section contains only debugging information. For |
| . example, this is set for ELF .debug and .stab sections. |
| . strip tests this flag to see if a section can be |
| . discarded. *} |
| .#define SEC_DEBUGGING 0x2000 |
| . |
| . {* 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 0x4000 |
| . |
| . {* The contents of this section are to be excluded by the |
| . linker for executable and shared objects unless those |
| . objects are to be further relocated. *} |
| .#define SEC_EXCLUDE 0x8000 |
| . |
| . {* The contents of this section are to be sorted based on the sum of |
| . the symbol and addend values specified by the associated relocation |
| . entries. Entries without associated relocation entries will be |
| . appended to the end of the section in an unspecified order. *} |
| .#define SEC_SORT_ENTRIES 0x10000 |
| . |
| . {* When linking, duplicate sections of the same name should be |
| . discarded, rather than being combined into a single section as |
| . is usually done. This is similar to how common symbols are |
| . handled. See SEC_LINK_DUPLICATES below. *} |
| .#define SEC_LINK_ONCE 0x20000 |
| . |
| . {* If SEC_LINK_ONCE is set, this bitfield describes how the linker |
| . should handle duplicate sections. *} |
| .#define SEC_LINK_DUPLICATES 0xc0000 |
| . |
| . {* This value for SEC_LINK_DUPLICATES means that duplicate |
| . sections with the same name should simply be discarded. *} |
| .#define SEC_LINK_DUPLICATES_DISCARD 0x0 |
| . |
| . {* This value for SEC_LINK_DUPLICATES means that the linker |
| . should warn if there are any duplicate sections, although |
| . it should still only link one copy. *} |
| .#define SEC_LINK_DUPLICATES_ONE_ONLY 0x40000 |
| . |
| . {* This value for SEC_LINK_DUPLICATES means that the linker |
| . should warn if any duplicate sections are a different size. *} |
| .#define SEC_LINK_DUPLICATES_SAME_SIZE 0x80000 |
| . |
| . {* This value for SEC_LINK_DUPLICATES means that the linker |
| . should warn if any duplicate sections contain different |
| . contents. *} |
| .#define SEC_LINK_DUPLICATES_SAME_CONTENTS \ |
| . (SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE) |
| . |
| . {* This section was created by the linker as part of dynamic |
| . relocation or other arcane processing. It is skipped when |
| . going through the first-pass output, trusting that someone |
| . else up the line will take care of it later. *} |
| .#define SEC_LINKER_CREATED 0x100000 |
| . |
| . {* This section contains a section ID to distinguish different |
| . sections with the same section name. *} |
| .#define SEC_ASSEMBLER_SECTION_ID 0x100000 |
| . |
| . {* This section should not be subject to garbage collection. |
| . Also set to inform the linker that this section should not be |
| . listed in the link map as discarded. *} |
| .#define SEC_KEEP 0x200000 |
| . |
| . {* This section contains "short" data, and should be placed |
| . "near" the GP. *} |
| .#define SEC_SMALL_DATA 0x400000 |
| . |
| . {* Attempt to merge identical entities in the section. |
| . Entity size is given in the entsize field. *} |
| .#define SEC_MERGE 0x800000 |
| . |
| . {* If given with SEC_MERGE, entities to merge are zero terminated |
| . strings where entsize specifies character size instead of fixed |
| . size entries. *} |
| .#define SEC_STRINGS 0x1000000 |
| . |
| . {* This section contains data about section groups. *} |
| .#define SEC_GROUP 0x2000000 |
| . |
| . {* The section is a COFF shared library section. This flag is |
| . only for the linker. If this type of section appears in |
| . the input file, the linker must copy it to the output file |
| . without changing the vma or size. FIXME: Although this |
| . was originally intended to be general, it really is COFF |
| . specific (and the flag was renamed to indicate this). It |
| . might be cleaner to have some more general mechanism to |
| . allow the back end to control what the linker does with |
| . sections. *} |
| .#define SEC_COFF_SHARED_LIBRARY 0x4000000 |
| . |
| . {* This input section should be copied to output in reverse order |
| . as an array of pointers. This is for ELF linker internal use |
| . only. *} |
| .#define SEC_ELF_REVERSE_COPY 0x4000000 |
| . |
| . {* This section contains data which may be shared with other |
| . executables or shared objects. This is for COFF only. *} |
| .#define SEC_COFF_SHARED 0x8000000 |
| . |
| . {* Indicate that section has the purecode flag set. *} |
| .#define SEC_ELF_PURECODE 0x8000000 |
| . |
| . {* When a section with this flag is being linked, then if the size of |
| . the input section is less than a page, it should not cross a page |
| . boundary. If the size of the input section is one page or more, |
| . it should be aligned on a page boundary. This is for TI |
| . TMS320C54X only. *} |
| .#define SEC_TIC54X_BLOCK 0x10000000 |
| . |
| . {* This section has the SHF_X86_64_LARGE flag. This is ELF x86-64 only. *} |
| .#define SEC_ELF_LARGE 0x10000000 |
| . |
| . {* Conditionally link this section; do not link if there are no |
| . references found to any symbol in the section. This is for TI |
| . TMS320C54X only. *} |
| .#define SEC_TIC54X_CLINK 0x20000000 |
| . |
| . {* This section contains vliw code. This is for Toshiba MeP only. *} |
| .#define SEC_MEP_VLIW 0x20000000 |
| . |
| . {* All symbols, sizes and relocations in this section are octets |
| . instead of bytes. Required for DWARF debug sections as DWARF |
| . information is organized in octets, not bytes. *} |
| .#define SEC_ELF_OCTETS 0x40000000 |
| . |
| . {* Indicate that section has the no read flag set. This happens |
| . when memory read flag isn't set. *} |
| .#define SEC_COFF_NOREAD 0x40000000 |
| . |
| . {* End of section flags. *} |
| . |
| . {* Some internal packed boolean fields. *} |
| . |
| . {* See the vma field. *} |
| . unsigned int user_set_vma : 1; |
| . |
| . {* A mark flag used by some of the linker backends. *} |
| . unsigned int linker_mark : 1; |
| . |
| . {* Another mark flag used by some of the linker backends. Set for |
| . output sections that have an input section. *} |
| . unsigned int linker_has_input : 1; |
| . |
| . {* Mark flag used by some linker backends for garbage collection. *} |
| . unsigned int gc_mark : 1; |
| . |
| . {* Section compression status. *} |
| . unsigned int compress_status : 2; |
| .#define COMPRESS_SECTION_NONE 0 |
| .#define COMPRESS_SECTION_DONE 1 |
| .#define DECOMPRESS_SECTION_ZLIB 2 |
| .#define DECOMPRESS_SECTION_ZSTD 3 |
| . |
| . {* The following flags are used by the ELF linker. *} |
| . |
| . {* Mark sections which have been allocated to segments. *} |
| . unsigned int segment_mark : 1; |
| . |
| . {* Type of sec_info information. *} |
| . unsigned int sec_info_type:3; |
| .#define SEC_INFO_TYPE_NONE 0 |
| .#define SEC_INFO_TYPE_STABS 1 |
| .#define SEC_INFO_TYPE_MERGE 2 |
| .#define SEC_INFO_TYPE_EH_FRAME 3 |
| .#define SEC_INFO_TYPE_JUST_SYMS 4 |
| .#define SEC_INFO_TYPE_TARGET 5 |
| .#define SEC_INFO_TYPE_EH_FRAME_ENTRY 6 |
| .#define SEC_INFO_TYPE_SFRAME 7 |
| . |
| . {* Nonzero if this section uses RELA relocations, rather than REL. *} |
| . unsigned int use_rela_p:1; |
| . |
| . {* Nonzero if this section contents are mmapped, rather than malloced. *} |
| . unsigned int mmapped_p:1; |
| . |
| . {* Bits used by various backends. The generic code doesn't touch |
| . these fields. *} |
| . |
| . unsigned int sec_flg0:1; |
| . unsigned int sec_flg1:1; |
| . unsigned int sec_flg2:1; |
| . unsigned int sec_flg3:1; |
| . unsigned int sec_flg4:1; |
| . unsigned int sec_flg5:1; |
| . |
| . {* End of internal packed boolean fields. *} |
| . |
| . {* The virtual memory address of the section - where it will be |
| . at run time. The symbols are relocated against this. The |
| . user_set_vma flag is maintained by bfd; if it's not set, the |
| . backend can assign addresses (for example, in <<a.out>>, where |
| . the default address for <<.data>> is dependent on the specific |
| . target and various flags). *} |
| . bfd_vma vma; |
| . |
| . {* The load address of the section - where it would be in a |
| . rom image; really only used for writing section header |
| . information. *} |
| . bfd_vma lma; |
| . |
| . {* The size of the section in *octets*, as it will be output. |
| . Contains a value even if the section has no contents (e.g., the |
| . size of <<.bss>>). *} |
| . bfd_size_type size; |
| . |
| . {* For input sections, the original size on disk of the section, in |
| . octets. This field should be set for any section whose size is |
| . changed by linker relaxation. It is required for sections where |
| . the linker relaxation scheme doesn't cache altered section and |
| . reloc contents (stabs, eh_frame, SEC_MERGE, some coff relaxing |
| . targets), and thus the original size needs to be kept to read the |
| . section multiple times. For output sections, rawsize holds the |
| . section size calculated on a previous linker relaxation pass. *} |
| . bfd_size_type rawsize; |
| . |
| . {* The compressed size of the section in octets. *} |
| . bfd_size_type compressed_size; |
| . |
| . {* If this section is going to be output, then this value is the |
| . offset in *bytes* into the output section of the first byte in the |
| . input section (byte ==> smallest addressable unit on the |
| . target). In most cases, if this was going to start at the |
| . 100th octet (8-bit quantity) in the output section, this value |
| . would be 100. However, if the target byte size is 16 bits |
| . (bfd_octets_per_byte is "2"), this value would be 50. *} |
| . bfd_vma output_offset; |
| . |
| . {* The output section through which to map on output. *} |
| . struct bfd_section *output_section; |
| . |
| . {* If an input section, a pointer to a vector of relocation |
| . records for the data in this section. *} |
| . struct reloc_cache_entry *relocation; |
| . |
| . {* If an output section, a pointer to a vector of pointers to |
| . relocation records for the data in this section. *} |
| . struct reloc_cache_entry **orelocation; |
| . |
| . {* The number of relocation records in one of the above. *} |
| . unsigned reloc_count; |
| . |
| . {* The alignment requirement of the section, as an exponent of 2 - |
| . e.g., 3 aligns to 2^3 (or 8). *} |
| . unsigned int alignment_power; |
| . |
| . {* Information below is back end specific - and not always used |
| . or updated. *} |
| . |
| . {* File position of section data. *} |
| . file_ptr filepos; |
| . |
| . {* File position of relocation info. *} |
| . file_ptr rel_filepos; |
| . |
| . {* File position of line data. *} |
| . file_ptr line_filepos; |
| . |
| . {* Pointer to data for applications. *} |
| . void *userdata; |
| . |
| . {* If the SEC_IN_MEMORY flag is set, this points to the actual |
| . contents. *} |
| . bfd_byte *contents; |
| . |
| . {* Attached line number information. *} |
| . alent *lineno; |
| . |
| . {* Number of line number records. *} |
| . unsigned int lineno_count; |
| . |
| . {* Entity size for merging purposes. *} |
| . unsigned int entsize; |
| . |
| . {* Points to the kept section if this section is a link-once section, |
| . and is discarded. *} |
| . struct bfd_section *kept_section; |
| . |
| . {* When a section is being output, this value changes as more |
| . linenumbers are written out. *} |
| . file_ptr moving_line_filepos; |
| . |
| . {* What the section number is in the target world. *} |
| . int target_index; |
| . |
| . void *used_by_bfd; |
| . |
| . {* If this is a constructor section then here is a list of the |
| . relocations created to relocate items within it. *} |
| . struct relent_chain *constructor_chain; |
| . |
| . {* The BFD which owns the section. *} |
| . bfd *owner; |
| . |
| . {* A symbol which points at this section only. *} |
| . struct bfd_symbol *symbol; |
| . struct bfd_symbol **symbol_ptr_ptr; |
| . |
| . {* Early in the link process, map_head and map_tail are used to build |
| . a list of input sections attached to an output section. Later, |
| . output sections use these fields for a list of bfd_link_order |
| . structs. The linked_to_symbol_name field is for ELF assembler |
| . internal use. *} |
| . union { |
| . struct bfd_link_order *link_order; |
| . struct bfd_section *s; |
| . const char *linked_to_symbol_name; |
| . } map_head, map_tail; |
| . |
| . {* Points to the output section this section is already assigned to, |
| . if any. This is used when support for non-contiguous memory |
| . regions is enabled. *} |
| . struct bfd_section *already_assigned; |
| . |
| . {* Explicitly specified section type, if non-zero. *} |
| . unsigned int type; |
| . |
| .} asection; |
| . |
| |
| EXTERNAL |
| .static inline const char * |
| .bfd_section_name (const asection *sec) |
| .{ |
| . return sec->name; |
| .} |
| . |
| .static inline bfd_size_type |
| .bfd_section_size (const asection *sec) |
| .{ |
| . return sec->size; |
| .} |
| . |
| .static inline bfd_vma |
| .bfd_section_vma (const asection *sec) |
| .{ |
| . return sec->vma; |
| .} |
| . |
| .static inline bfd_vma |
| .bfd_section_lma (const asection *sec) |
| .{ |
| . return sec->lma; |
| .} |
| . |
| .static inline unsigned int |
| .bfd_section_alignment (const asection *sec) |
| .{ |
| . return sec->alignment_power; |
| .} |
| . |
| .static inline flagword |
| .bfd_section_flags (const asection *sec) |
| .{ |
| . return sec->flags; |
| .} |
| . |
| .static inline void * |
| .bfd_section_userdata (const asection *sec) |
| .{ |
| . return sec->userdata; |
| .} |
| .static inline bool |
| .bfd_is_com_section (const asection *sec) |
| .{ |
| . return (sec->flags & SEC_IS_COMMON) != 0; |
| .} |
| . |
| .{* Note: the following are provided as inline functions rather than macros |
| . because not all callers use the return value. A macro implementation |
| . would use a comma expression, eg: "((ptr)->foo = val, TRUE)" and some |
| . compilers will complain about comma expressions that have no effect. *} |
| .static inline bool |
| .bfd_set_section_userdata (asection *sec, void *val) |
| .{ |
| . sec->userdata = val; |
| . return true; |
| .} |
| . |
| .static inline bool |
| .bfd_set_section_vma (asection *sec, bfd_vma val) |
| .{ |
| . sec->vma = sec->lma = val; |
| . sec->user_set_vma = true; |
| . return true; |
| .} |
| . |
| .static inline bool |
| .bfd_set_section_lma (asection *sec, bfd_vma val) |
| .{ |
| . sec->lma = val; |
| . return true; |
| .} |
| . |
| .static inline bool |
| .bfd_set_section_alignment (asection *sec, unsigned int val) |
| .{ |
| . if (val >= sizeof (bfd_vma) * 8 - 1) |
| . return false; |
| . sec->alignment_power = val; |
| . return true; |
| .} |
| . |
| .{* These sections are global, and are managed by BFD. The application |
| . and target back end are not permitted to change the values in |
| . these sections. *} |
| .extern asection _bfd_std_section[4]; |
| . |
| .#define BFD_ABS_SECTION_NAME "*ABS*" |
| .#define BFD_UND_SECTION_NAME "*UND*" |
| .#define BFD_COM_SECTION_NAME "*COM*" |
| .#define BFD_IND_SECTION_NAME "*IND*" |
| . |
| .{* Pointer to the common section. *} |
| .#define bfd_com_section_ptr (&_bfd_std_section[0]) |
| .{* Pointer to the undefined section. *} |
| .#define bfd_und_section_ptr (&_bfd_std_section[1]) |
| .{* Pointer to the absolute section. *} |
| .#define bfd_abs_section_ptr (&_bfd_std_section[2]) |
| .{* Pointer to the indirect section. *} |
| .#define bfd_ind_section_ptr (&_bfd_std_section[3]) |
| . |
| .static inline bool |
| .bfd_is_und_section (const asection *sec) |
| .{ |
| . return sec == bfd_und_section_ptr; |
| .} |
| . |
| .static inline bool |
| .bfd_is_abs_section (const asection *sec) |
| .{ |
| . return sec == bfd_abs_section_ptr; |
| .} |
| . |
| .static inline bool |
| .bfd_is_ind_section (const asection *sec) |
| .{ |
| . return sec == bfd_ind_section_ptr; |
| .} |
| . |
| .static inline bool |
| .bfd_is_const_section (const asection *sec) |
| .{ |
| . return (sec >= _bfd_std_section |
| . && sec < _bfd_std_section + (sizeof (_bfd_std_section) |
| . / sizeof (_bfd_std_section[0]))); |
| .} |
| . |
| .{* Return TRUE if input section SEC has been discarded. *} |
| .static inline bool |
| .discarded_section (const asection *sec) |
| .{ |
| . return (!bfd_is_abs_section (sec) |
| . && bfd_is_abs_section (sec->output_section) |
| . && sec->sec_info_type != SEC_INFO_TYPE_MERGE |
| . && sec->sec_info_type != SEC_INFO_TYPE_JUST_SYMS); |
| .} |
| . |
| .#define BFD_FAKE_SECTION(SEC, SYM, NAME, IDX, FLAGS) \ |
| . {* name, next, prev, id, section_id, index, flags, user_set_vma, *} \ |
| . { NAME, NULL, NULL, IDX, 0, 0, FLAGS, 0, \ |
| . \ |
| . {* linker_mark, linker_has_input, gc_mark, decompress_status, *} \ |
| . 0, 0, 1, 0, \ |
| . \ |
| . {* segment_mark, sec_info_type, use_rela_p, mmapped_p, *} \ |
| . 0, 0, 0, 0, \ |
| . \ |
| . {* sec_flg0, sec_flg1, sec_flg2, sec_flg3, sec_flg4, sec_flg5, *} \ |
| . 0, 0, 0, 0, 0, 0, \ |
| . \ |
| . {* vma, lma, size, rawsize, compressed_size, *} \ |
| . 0, 0, 0, 0, 0, \ |
| . \ |
| . {* output_offset, output_section, relocation, orelocation, *} \ |
| . 0, &SEC, NULL, NULL, \ |
| . \ |
| . {* reloc_count, alignment_power, filepos, rel_filepos, *} \ |
| . 0, 0, 0, 0, \ |
| . \ |
| . {* line_filepos, userdata, contents, lineno, lineno_count, *} \ |
| . 0, NULL, NULL, NULL, 0, \ |
| . \ |
| . {* entsize, kept_section, moving_line_filepos, *} \ |
| . 0, NULL, 0, \ |
| . \ |
| . {* target_index, used_by_bfd, constructor_chain, owner, *} \ |
| . 0, NULL, NULL, NULL, \ |
| . \ |
| . {* symbol, symbol_ptr_ptr, *} \ |
| . (struct bfd_symbol *) SYM, &SEC.symbol, \ |
| . \ |
| . {* map_head, map_tail, already_assigned, type *} \ |
| . { NULL }, { NULL }, NULL, 0 \ |
| . \ |
| . } |
| . |
| .{* We use a macro to initialize the static asymbol structures because |
| . traditional C does not permit us to initialize a union member while |
| . gcc warns if we don't initialize it. |
| . the_bfd, name, value, attr, section [, udata] *} |
| .#ifdef __STDC__ |
| .#define GLOBAL_SYM_INIT(NAME, SECTION) \ |
| . { 0, NAME, 0, BSF_SECTION_SYM, SECTION, { 0 }} |
| .#else |
| .#define GLOBAL_SYM_INIT(NAME, SECTION) \ |
| . { 0, NAME, 0, BSF_SECTION_SYM, SECTION } |
| .#endif |
| . |
| */ |
| |
| /* 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[] = |
| { |
| GLOBAL_SYM_INIT (BFD_COM_SECTION_NAME, bfd_com_section_ptr), |
| GLOBAL_SYM_INIT (BFD_UND_SECTION_NAME, bfd_und_section_ptr), |
| GLOBAL_SYM_INIT (BFD_ABS_SECTION_NAME, bfd_abs_section_ptr), |
| GLOBAL_SYM_INIT (BFD_IND_SECTION_NAME, bfd_ind_section_ptr) |
| }; |
| |
| #define STD_SECTION(NAME, IDX, FLAGS) \ |
| BFD_FAKE_SECTION(_bfd_std_section[IDX], &global_syms[IDX], NAME, IDX, FLAGS) |
| |
| asection _bfd_std_section[] = { |
| STD_SECTION (BFD_COM_SECTION_NAME, 0, SEC_IS_COMMON), |
| STD_SECTION (BFD_UND_SECTION_NAME, 1, 0), |
| STD_SECTION (BFD_ABS_SECTION_NAME, 2, 0), |
| STD_SECTION (BFD_IND_SECTION_NAME, 3, 0) |
| }; |
| #undef STD_SECTION |
| |
| /* Initialize an entry in the section hash table. */ |
| |
| struct bfd_hash_entry * |
| bfd_section_hash_newfunc (struct bfd_hash_entry *entry, |
| struct bfd_hash_table *table, |
| const char *string) |
| { |
| /* Allocate the structure if it has not already been allocated by a |
| subclass. */ |
| if (entry == NULL) |
| { |
| entry = (struct bfd_hash_entry *) |
| bfd_hash_allocate (table, sizeof (struct section_hash_entry)); |
| if (entry == NULL) |
| return entry; |
| } |
| |
| /* Call the allocation method of the superclass. */ |
| entry = bfd_hash_newfunc (entry, table, string); |
| if (entry != NULL) |
| memset (&((struct section_hash_entry *) entry)->section, 0, |
| sizeof (asection)); |
| |
| return entry; |
| } |
| |
| #define section_hash_lookup(table, string, create, copy) \ |
| ((struct section_hash_entry *) \ |
| bfd_hash_lookup ((table), (string), (create), (copy))) |
| |
| /* Create a symbol whose only job is to point to this section. This |
| is useful for things like relocs which are relative to the base |
| of a section. */ |
| |
| bool |
| _bfd_generic_new_section_hook (bfd *abfd, asection *newsect) |
| { |
| newsect->symbol = bfd_make_empty_symbol (abfd); |
| if (newsect->symbol == NULL) |
| return false; |
| |
| newsect->symbol->name = newsect->name; |
| newsect->symbol->value = 0; |
| newsect->symbol->section = newsect; |
| newsect->symbol->flags = BSF_SECTION_SYM; |
| |
| newsect->symbol_ptr_ptr = &newsect->symbol; |
| return true; |
| } |
| |
| unsigned int _bfd_section_id = 0x10; /* id 0 to 3 used by STD_SECTION. */ |
| |
| /* Initializes a new section. NEWSECT->NAME is already set. */ |
| |
| static asection * |
| bfd_section_init (bfd *abfd, asection *newsect) |
| { |
| newsect->id = _bfd_section_id; |
| newsect->index = abfd->section_count; |
| newsect->owner = abfd; |
| |
| if (! BFD_SEND (abfd, _new_section_hook, (abfd, newsect))) |
| return NULL; |
| |
| _bfd_section_id++; |
| abfd->section_count++; |
| bfd_section_list_append (abfd, newsect); |
| return newsect; |
| } |
| |
| /* |
| DOCDD |
| INODE |
| section prototypes, , typedef asection, Sections |
| SUBSECTION |
| Section prototypes |
| |
| These are the functions exported by the section handling part of BFD. |
| */ |
| |
| /* |
| FUNCTION |
| bfd_section_list_clear |
| |
| SYNOPSIS |
| void bfd_section_list_clear (bfd *); |
| |
| DESCRIPTION |
| Clears the section list, and also resets the section count and |
| hash table entries. |
| */ |
| |
| void |
| bfd_section_list_clear (bfd *abfd) |
| { |
| abfd->sections = NULL; |
| abfd->section_last = NULL; |
| abfd->section_count = 0; |
| memset (abfd->section_htab.table, 0, |
| abfd->section_htab.size * sizeof (struct bfd_hash_entry *)); |
| abfd->section_htab.count = 0; |
| } |
| |
| /* |
| FUNCTION |
| bfd_get_section_by_name |
| |
| SYNOPSIS |
| asection *bfd_get_section_by_name (bfd *abfd, const char *name); |
| |
| DESCRIPTION |
| Return the most recently created section attached to @var{abfd} |
| named @var{name}. Return NULL if no such section exists. |
| */ |
| |
| asection * |
| bfd_get_section_by_name (bfd *abfd, const char *name) |
| { |
| struct section_hash_entry *sh; |
| |
| if (name == NULL) |
| return NULL; |
| |
| sh = section_hash_lookup (&abfd->section_htab, name, false, false); |
| if (sh != NULL) |
| return &sh->section; |
| |
| return NULL; |
| } |
| |
| /* |
| FUNCTION |
| bfd_get_next_section_by_name |
| |
| SYNOPSIS |
| asection *bfd_get_next_section_by_name (bfd *ibfd, asection *sec); |
| |
| DESCRIPTION |
| Given @var{sec} is a section returned by @code{bfd_get_section_by_name}, |
| return the next most recently created section attached to the same |
| BFD with the same name, or if no such section exists in the same BFD and |
| IBFD is non-NULL, the next section with the same name in any input |
| BFD following IBFD. Return NULL on finding no section. |
| */ |
| |
| asection * |
| bfd_get_next_section_by_name (bfd *ibfd, asection *sec) |
| { |
| struct section_hash_entry *sh; |
| const char *name; |
| unsigned long hash; |
| |
| sh = ((struct section_hash_entry *) |
| ((char *) sec - offsetof (struct section_hash_entry, section))); |
| |
| hash = sh->root.hash; |
| name = sec->name; |
| for (sh = (struct section_hash_entry *) sh->root.next; |
| sh != NULL; |
| sh = (struct section_hash_entry *) sh->root.next) |
| if (sh->root.hash == hash |
| && strcmp (sh->root.string, name) == 0) |
| return &sh->section; |
| |
| if (ibfd != NULL) |
| { |
| while ((ibfd = ibfd->link.next) != NULL) |
| { |
| asection *s = bfd_get_section_by_name (ibfd, name); |
| if (s != NULL) |
| return s; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* |
| FUNCTION |
| bfd_get_linker_section |
| |
| SYNOPSIS |
| asection *bfd_get_linker_section (bfd *abfd, const char *name); |
| |
| DESCRIPTION |
| Return the linker created section attached to @var{abfd} |
| named @var{name}. Return NULL if no such section exists. |
| */ |
| |
| asection * |
| bfd_get_linker_section (bfd *abfd, const char *name) |
| { |
| asection *sec = bfd_get_section_by_name (abfd, name); |
| |
| while (sec != NULL && (sec->flags & SEC_LINKER_CREATED) == 0) |
| sec = bfd_get_next_section_by_name (NULL, sec); |
| return sec; |
| } |
| |
| /* |
| FUNCTION |
| bfd_get_section_by_name_if |
| |
| SYNOPSIS |
| asection *bfd_get_section_by_name_if |
| (bfd *abfd, |
| const char *name, |
| bool (*func) (bfd *abfd, asection *sect, void *obj), |
| void *obj); |
| |
| DESCRIPTION |
| Call the provided function @var{func} for each section |
| attached to the BFD @var{abfd} whose name matches @var{name}, |
| passing @var{obj} as an argument. The function will be called |
| as if by |
| |
| | func (abfd, the_section, obj); |
| |
| It returns the first section for which @var{func} returns true, |
| otherwise <<NULL>>. |
| |
| */ |
| |
| asection * |
| bfd_get_section_by_name_if (bfd *abfd, const char *name, |
| bool (*operation) (bfd *, asection *, void *), |
| void *user_storage) |
| { |
| struct section_hash_entry *sh; |
| unsigned long hash; |
| |
| if (name == NULL) |
| return NULL; |
| |
| sh = section_hash_lookup (&abfd->section_htab, name, false, false); |
| if (sh == NULL) |
| return NULL; |
| |
| hash = sh->root.hash; |
| for (; sh != NULL; sh = (struct section_hash_entry *) sh->root.next) |
| if (sh->root.hash == hash |
| && strcmp (sh->root.string, name) == 0 |
| && (*operation) (abfd, &sh->section, user_storage)) |
| return &sh->section; |
| |
| return NULL; |
| } |
| |
| /* |
| FUNCTION |
| bfd_get_unique_section_name |
| |
| SYNOPSIS |
| char *bfd_get_unique_section_name |
| (bfd *abfd, const char *templat, int *count); |
| |
| DESCRIPTION |
| Invent a section name that is unique in @var{abfd} by tacking |
| a dot and a digit suffix onto the original @var{templat}. If |
| @var{count} is non-NULL, then it specifies the first number |
| tried as a suffix to generate a unique name. The value |
| pointed to by @var{count} will be incremented in this case. |
| */ |
| |
| char * |
| bfd_get_unique_section_name (bfd *abfd, const char *templat, int *count) |
| { |
| int num; |
| unsigned int len; |
| char *sname; |
| |
| len = strlen (templat); |
| sname = (char *) bfd_malloc (len + 8); |
| if (sname == NULL) |
| return NULL; |
| memcpy (sname, templat, len); |
| num = 1; |
| if (count != NULL) |
| num = *count; |
| |
| do |
| { |
| /* If we have a million sections, something is badly wrong. */ |
| if (num > 999999) |
| abort (); |
| sprintf (sname + len, ".%d", num++); |
| } |
| while (section_hash_lookup (&abfd->section_htab, sname, false, false)); |
| |
| if (count != NULL) |
| *count = num; |
| return sname; |
| } |
| |
| /* |
| FUNCTION |
| bfd_make_section_old_way |
| |
| SYNOPSIS |
| asection *bfd_make_section_old_way (bfd *abfd, const char *name); |
| |
| DESCRIPTION |
| Create a new empty section called @var{name} |
| and attach it to the end of the chain of sections for the |
| BFD @var{abfd}. An attempt to create a section with a name which |
| is already in use returns its pointer without changing the |
| section chain. |
| |
| It has the funny name since this is the way it used to be |
| before it was rewritten.... |
| |
| Possible errors are: |
| o <<bfd_error_invalid_operation>> - |
| If output has already started for this BFD. |
| o <<bfd_error_no_memory>> - |
| If memory allocation fails. |
| |
| */ |
| |
| asection * |
| bfd_make_section_old_way (bfd *abfd, const char *name) |
| { |
| asection *newsect; |
| |
| if (abfd->output_has_begun) |
| { |
| bfd_set_error (bfd_error_invalid_operation); |
| return NULL; |
| } |
| |
| if (strcmp (name, BFD_ABS_SECTION_NAME) == 0) |
| newsect = bfd_abs_section_ptr; |
| else if (strcmp (name, BFD_COM_SECTION_NAME) == 0) |
| newsect = bfd_com_section_ptr; |
| else if (strcmp (name, BFD_UND_SECTION_NAME) == 0) |
| newsect = bfd_und_section_ptr; |
| else if (strcmp (name, BFD_IND_SECTION_NAME) == 0) |
| newsect = bfd_ind_section_ptr; |
| else |
| { |
| struct section_hash_entry *sh; |
| |
| sh = section_hash_lookup (&abfd->section_htab, name, true, false); |
| if (sh == NULL) |
| return NULL; |
| |
| newsect = &sh->section; |
| if (newsect->name != NULL) |
| { |
| /* Section already exists. */ |
| return newsect; |
| } |
| |
| newsect->name = name; |
| return bfd_section_init (abfd, newsect); |
| } |
| |
| /* Call new_section_hook when "creating" the standard abs, com, und |
| and ind sections to tack on format specific section data. |
| Also, create a proper section symbol. */ |
| if (! BFD_SEND (abfd, _new_section_hook, (abfd, newsect))) |
| return NULL; |
| return newsect; |
| } |
| |
| /* |
| FUNCTION |
| bfd_make_section_anyway_with_flags |
| |
| SYNOPSIS |
| asection *bfd_make_section_anyway_with_flags |
| (bfd *abfd, const char *name, flagword flags); |
| |
| 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. Also set the attributes of the |
| new section to the value @var{flags}. |
| |
| Return <<NULL>> and set <<bfd_error>> on error; possible errors are: |
| o <<bfd_error_invalid_operation>> - If output has already started for @var{abfd}. |
| o <<bfd_error_no_memory>> - If memory allocation fails. |
| */ |
| |
| sec_ptr |
| bfd_make_section_anyway_with_flags (bfd *abfd, const char *name, |
| flagword flags) |
| { |
| struct section_hash_entry *sh; |
| asection *newsect; |
| |
| if (abfd->output_has_begun) |
| { |
| bfd_set_error (bfd_error_invalid_operation); |
| return NULL; |
| } |
| |
| sh = section_hash_lookup (&abfd->section_htab, name, true, false); |
| if (sh == NULL) |
| return NULL; |
| |
| newsect = &sh->section; |
| if (newsect->name != NULL) |
| { |
| /* We are making a section of the same name. Put it in the |
| section hash table. Even though we can't find it directly by a |
| hash lookup, we'll be able to find the section by traversing |
| sh->root.next quicker than looking at all the bfd sections. */ |
| struct section_hash_entry *new_sh; |
| new_sh = (struct section_hash_entry *) |
| bfd_section_hash_newfunc (NULL, &abfd->section_htab, name); |
| if (new_sh == NULL) |
| return NULL; |
| |
| new_sh->root = sh->root; |
| sh->root.next = &new_sh->root; |
| newsect = &new_sh->section; |
| } |
| |
| newsect->flags = flags; |
| newsect->name = name; |
| return bfd_section_init (abfd, newsect); |
| } |
| |
| /* |
| FUNCTION |
| bfd_make_section_anyway |
| |
| SYNOPSIS |
| asection *bfd_make_section_anyway (bfd *abfd, const char *name); |
| |
| 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. |
| |
| Return <<NULL>> and set <<bfd_error>> on error; possible errors are: |
| o <<bfd_error_invalid_operation>> - If output has already started for @var{abfd}. |
| o <<bfd_error_no_memory>> - If memory allocation fails. |
| */ |
| |
| sec_ptr |
| bfd_make_section_anyway (bfd *abfd, const char *name) |
| { |
| return bfd_make_section_anyway_with_flags (abfd, name, 0); |
| } |
| |
| /* |
| FUNCTION |
| bfd_make_section_with_flags |
| |
| SYNOPSIS |
| asection *bfd_make_section_with_flags |
| (bfd *, const char *name, flagword flags); |
| |
| DESCRIPTION |
| Like <<bfd_make_section_anyway>>, but return <<NULL>> (without calling |
| bfd_set_error ()) without changing the section chain if there is already a |
| section named @var{name}. Also set the attributes of the new section to |
| the value @var{flags}. If there is an error, return <<NULL>> and set |
| <<bfd_error>>. |
| */ |
| |
| asection * |
| bfd_make_section_with_flags (bfd *abfd, const char *name, |
| flagword flags) |
| { |
| struct section_hash_entry *sh; |
| asection *newsect; |
| |
| if (abfd == NULL || name == NULL || abfd->output_has_begun) |
| { |
| bfd_set_error (bfd_error_invalid_operation); |
| return NULL; |
| } |
| |
| if (strcmp (name, BFD_ABS_SECTION_NAME) == 0 |
| || strcmp (name, BFD_COM_SECTION_NAME) == 0 |
| || strcmp (name, BFD_UND_SECTION_NAME) == 0 |
| || strcmp (name, BFD_IND_SECTION_NAME) == 0) |
| return NULL; |
| |
| sh = section_hash_lookup (&abfd->section_htab, name, true, false); |
| if (sh == NULL) |
| return NULL; |
| |
| newsect = &sh->section; |
| if (newsect->name != NULL) |
| { |
| /* Section already exists. */ |
| return NULL; |
| } |
| |
| newsect->name = name; |
| newsect->flags = flags; |
| return bfd_section_init (abfd, newsect); |
| } |
| |
| /* |
| FUNCTION |
| bfd_make_section |
| |
| SYNOPSIS |
| asection *bfd_make_section (bfd *, const char *name); |
| |
| DESCRIPTION |
| Like <<bfd_make_section_anyway>>, but return <<NULL>> (without calling |
| bfd_set_error ()) without changing the section chain if there is already a |
| section named @var{name}. If there is an error, return <<NULL>> and set |
| <<bfd_error>>. |
| */ |
| |
| asection * |
| bfd_make_section (bfd *abfd, const char *name) |
| { |
| return bfd_make_section_with_flags (abfd, name, 0); |
| } |
| |
| /* |
| FUNCTION |
| bfd_set_section_flags |
| |
| SYNOPSIS |
| bool bfd_set_section_flags (asection *sec, flagword flags); |
| |
| DESCRIPTION |
| Set the attributes of the section @var{sec} to the value @var{flags}. |
| Return <<TRUE>> on success, <<FALSE>> on error. Possible error |
| returns are: |
| |
| o <<bfd_error_invalid_operation>> - |
| The section cannot have one or more of the attributes |
| requested. For example, a .bss section in <<a.out>> may not |
| have the <<SEC_HAS_CONTENTS>> field set. |
| |
| */ |
| |
| bool |
| bfd_set_section_flags (asection *section, flagword flags) |
| { |
| section->flags = flags; |
| return true; |
| } |
| |
| /* |
| FUNCTION |
| bfd_rename_section |
| |
| SYNOPSIS |
| void bfd_rename_section |
| (asection *sec, const char *newname); |
| |
| DESCRIPTION |
| Rename section @var{sec} to @var{newname}. |
| */ |
| |
| void |
| bfd_rename_section (asection *sec, const char *newname) |
| { |
| struct section_hash_entry *sh; |
| |
| sh = (struct section_hash_entry *) |
| ((char *) sec - offsetof (struct section_hash_entry, section)); |
| sh->section.name = newname; |
| bfd_hash_rename (&sec->owner->section_htab, newname, &sh->root); |
| } |
| |
| /* |
| FUNCTION |
| bfd_map_over_sections |
| |
| SYNOPSIS |
| void bfd_map_over_sections |
| (bfd *abfd, |
| void (*func) (bfd *abfd, asection *sect, void *obj), |
| void *obj); |
| |
| 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 |
| |
| | func (abfd, the_section, obj); |
| |
| This is the preferred method for iterating over sections; an |
| alternative would be to use a loop: |
| |
| | asection *p; |
| | for (p = abfd->sections; p != NULL; p = p->next) |
| | func (abfd, p, ...) |
| |
| */ |
| |
| void |
| bfd_map_over_sections (bfd *abfd, |
| void (*operation) (bfd *, asection *, void *), |
| void *user_storage) |
| { |
| asection *sect; |
| unsigned 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 (); |
| } |
| |
| /* |
| FUNCTION |
| bfd_sections_find_if |
| |
| SYNOPSIS |
| asection *bfd_sections_find_if |
| (bfd *abfd, |
| bool (*operation) (bfd *abfd, asection *sect, void *obj), |
| void *obj); |
| |
| DESCRIPTION |
| Call the provided function @var{operation} for each section |
| attached to the BFD @var{abfd}, passing @var{obj} as an |
| argument. The function will be called as if by |
| |
| | operation (abfd, the_section, obj); |
| |
| It returns the first section for which @var{operation} returns true. |
| |
| */ |
| |
| asection * |
| bfd_sections_find_if (bfd *abfd, |
| bool (*operation) (bfd *, asection *, void *), |
| void *user_storage) |
| { |
| asection *sect; |
| |
| for (sect = abfd->sections; sect != NULL; sect = sect->next) |
| if ((*operation) (abfd, sect, user_storage)) |
| break; |
| |
| return sect; |
| } |
| |
| /* |
| FUNCTION |
| bfd_set_section_size |
| |
| SYNOPSIS |
| bool bfd_set_section_size (asection *sec, bfd_size_type val); |
| |
| DESCRIPTION |
| Set @var{sec} to the size @var{val}. If the operation is |
| ok, then <<TRUE>> is returned, else <<FALSE>>. |
| |
| Possible error returns: |
| o <<bfd_error_invalid_operation>> - |
| Writing has started to the BFD, so setting the size is invalid. |
| |
| */ |
| |
| bool |
| bfd_set_section_size (asection *sec, bfd_size_type val) |
| { |
| /* Once you've started writing to any section you cannot create or change |
| the size of any others. */ |
| |
| if (sec->owner == NULL || sec->owner->output_has_begun) |
| { |
| bfd_set_error (bfd_error_invalid_operation); |
| return false; |
| } |
| |
| sec->size = val; |
| return true; |
| } |
| |
| /* |
| FUNCTION |
| bfd_set_section_contents |
| |
| SYNOPSIS |
| bool bfd_set_section_contents |
| (bfd *abfd, asection *section, const void *data, |
| file_ptr offset, bfd_size_type count); |
| |
| DESCRIPTION |
| Sets the contents of the section @var{section} in BFD |
| @var{abfd} to the data starting in memory at @var{location}. |
| The data is written to the output section starting at offset |
| @var{offset} for @var{count} octets. |
| |
| Normally <<TRUE>> is returned, but <<FALSE>> is returned if |
| there was an error. Possible error returns are: |
| o <<bfd_error_no_contents>> - |
| The output section does not have the <<SEC_HAS_CONTENTS>> |
| attribute, so nothing can be written to it. |
| o <<bfd_error_bad_value>> - |
| The section is unable to contain all of the data. |
| o <<bfd_error_invalid_operation>> - |
| The BFD is not writeable. |
| o and some more too. |
| |
| This routine is front end to the back end function |
| <<_bfd_set_section_contents>>. |
| |
| */ |
| |
| bool |
| bfd_set_section_contents (bfd *abfd, |
| sec_ptr section, |
| const void *location, |
| file_ptr offset, |
| bfd_size_type count) |
| { |
| bfd_size_type sz; |
| |
| if (!(bfd_section_flags (section) & SEC_HAS_CONTENTS)) |
| { |
| bfd_set_error (bfd_error_no_contents); |
| return false; |
| } |
| |
| sz = section->size; |
| if ((bfd_size_type) offset > sz |
| || count > sz - offset |
| || count != (size_t) count) |
| { |
| bfd_set_error (bfd_error_bad_value); |
| return false; |
| } |
| |
| if (!bfd_write_p (abfd)) |
| { |
| bfd_set_error (bfd_error_invalid_operation); |
| return false; |
| } |
| |
| /* Record a copy of the data in memory if desired. */ |
| if (section->contents |
| && location != section->contents + offset) |
| memcpy (section->contents + offset, location, (size_t) count); |
| |
| if (BFD_SEND (abfd, _bfd_set_section_contents, |
| (abfd, section, location, offset, count))) |
| { |
| abfd->output_has_begun = true; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* |
| FUNCTION |
| bfd_get_section_contents |
| |
| SYNOPSIS |
| bool bfd_get_section_contents |
| (bfd *abfd, asection *section, void *location, file_ptr offset, |
| bfd_size_type count); |
| |
| DESCRIPTION |
| Read data from @var{section} in BFD @var{abfd} |
| into memory starting at @var{location}. The data is read at an |
| offset of @var{offset} from the start of the input section, |
| and is read for @var{count} bytes. |
| |
| If the contents of a constructor with the <<SEC_CONSTRUCTOR>> |
| flag set are requested or if the section does not have the |
| <<SEC_HAS_CONTENTS>> flag set, then the @var{location} is filled |
| with zeroes. If no errors occur, <<TRUE>> is returned, else |
| <<FALSE>>. |
| |
| */ |
| bool |
| bfd_get_section_contents (bfd *abfd, |
| sec_ptr section, |
| void *location, |
| file_ptr offset, |
| bfd_size_type count) |
| { |
| bfd_size_type sz; |
| |
| if (count == 0) |
| /* Don't bother. */ |
| return true; |
| |
| if (section == NULL) |
| { |
| bfd_set_error (bfd_error_bad_value); |
| return false; |
| } |
| |
| if (location == NULL) |
| { |
| if (section->mmapped_p) |
| { |
| /* Pass this request straight on to the target's function. |
| All of the code below assumes that location != NULL. |
| FIXME: Should we still check that count is sane ? */ |
| return BFD_SEND (abfd, _bfd_get_section_contents, |
| (abfd, section, location, offset, count)); |
| } |
| |
| bfd_set_error (bfd_error_bad_value); |
| return false; |
| } |
| |
| if (section->flags & SEC_CONSTRUCTOR) |
| { |
| memset (location, 0, (size_t) count); |
| return true; |
| } |
| |
| if ((section->flags & SEC_HAS_CONTENTS) == 0) |
| { |
| memset (location, 0, (size_t) count); |
| return true; |
| } |
| |
| if (abfd == NULL) |
| return false; |
| |
| sz = bfd_get_section_limit_octets (abfd, section); |
| if ((bfd_size_type) offset > sz |
| || count > sz - offset |
| || count != (size_t) count) |
| { |
| bfd_set_error (bfd_error_bad_value); |
| return false; |
| } |
| |
| if ((section->flags & SEC_IN_MEMORY) != 0) |
| { |
| if (section->contents == NULL) |
| { |
| /* This can happen because of errors earlier on in the linking process. |
| We do not want to seg-fault here, so clear the flag and return an |
| error code. */ |
| section->flags &= ~ SEC_IN_MEMORY; |
| bfd_set_error (bfd_error_invalid_operation); |
| return false; |
| } |
| |
| memmove (location, section->contents + offset, (size_t) count); |
| return true; |
| } |
| |
| return BFD_SEND (abfd, _bfd_get_section_contents, |
| (abfd, section, location, offset, count)); |
| } |
| |
| /* |
| FUNCTION |
| bfd_malloc_and_get_section |
| |
| SYNOPSIS |
| bool bfd_malloc_and_get_section |
| (bfd *abfd, asection *section, bfd_byte **buf); |
| |
| DESCRIPTION |
| Read all data from @var{section} in BFD @var{abfd} |
| into a buffer, *@var{buf}, malloc'd by this function. |
| Return @code{true} on success, @code{false} on failure in which |
| case *@var{buf} will be NULL. |
| */ |
| |
| bool |
| bfd_malloc_and_get_section (bfd *abfd, sec_ptr sec, bfd_byte **buf) |
| { |
| if (sec->mmapped_p) |
| abort (); |
| *buf = NULL; |
| return bfd_get_full_section_contents (abfd, sec, buf); |
| } |
| /* |
| FUNCTION |
| bfd_copy_private_section_data |
| |
| SYNOPSIS |
| bool bfd_copy_private_section_data |
| (bfd *ibfd, asection *isec, bfd *obfd, asection *osec); |
| |
| DESCRIPTION |
| Copy private section information from @var{isec} in the BFD |
| @var{ibfd} to the section @var{osec} in the BFD @var{obfd}. |
| Return <<TRUE>> on success, <<FALSE>> on error. Possible error |
| returns are: |
| |
| o <<bfd_error_no_memory>> - |
| Not enough memory exists to create private data for @var{osec}. |
| |
| .#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \ |
| . BFD_SEND (obfd, _bfd_copy_private_section_data, \ |
| . (ibfd, isection, obfd, osection)) |
| */ |
| |
| /* |
| FUNCTION |
| bfd_generic_is_group_section |
| |
| SYNOPSIS |
| bool bfd_generic_is_group_section (bfd *, const asection *sec); |
| |
| DESCRIPTION |
| Returns TRUE if @var{sec} is a member of a group. |
| */ |
| |
| bool |
| bfd_generic_is_group_section (bfd *abfd ATTRIBUTE_UNUSED, |
| const asection *sec ATTRIBUTE_UNUSED) |
| { |
| return false; |
| } |
| |
| /* |
| FUNCTION |
| bfd_generic_group_name |
| |
| SYNOPSIS |
| const char *bfd_generic_group_name (bfd *, const asection *sec); |
| |
| DESCRIPTION |
| Returns group name if @var{sec} is a member of a group. |
| */ |
| |
| const char * |
| bfd_generic_group_name (bfd *abfd ATTRIBUTE_UNUSED, |
| const asection *sec ATTRIBUTE_UNUSED) |
| { |
| return NULL; |
| } |
| |
| /* |
| FUNCTION |
| bfd_generic_discard_group |
| |
| SYNOPSIS |
| bool bfd_generic_discard_group (bfd *abfd, asection *group); |
| |
| DESCRIPTION |
| Remove all members of @var{group} from the output. |
| */ |
| |
| bool |
| bfd_generic_discard_group (bfd *abfd ATTRIBUTE_UNUSED, |
| asection *group ATTRIBUTE_UNUSED) |
| { |
| return true; |
| } |
| |
| bool |
| _bfd_nowrite_set_section_contents (bfd *abfd, |
| sec_ptr section ATTRIBUTE_UNUSED, |
| const void *location ATTRIBUTE_UNUSED, |
| file_ptr offset ATTRIBUTE_UNUSED, |
| bfd_size_type count ATTRIBUTE_UNUSED) |
| { |
| return _bfd_bool_bfd_false_error (abfd); |
| } |
| |
| /* |
| FUNCTION |
| bfd_section_size_insane |
| |
| SYNOPSIS |
| bool bfd_section_size_insane (bfd *abfd, asection *sec); |
| |
| DESCRIPTION |
| Returns true if the given section has a size that indicates |
| it cannot be read from file. Return false if the size is OK |
| *or* this function can't say one way or the other. |
| |
| */ |
| |
| bool |
| bfd_section_size_insane (bfd *abfd, asection *sec) |
| { |
| bfd_size_type size = bfd_get_section_limit_octets (abfd, sec); |
| if (size == 0) |
| return false; |
| |
| if ((bfd_section_flags (sec) & SEC_IN_MEMORY) != 0 |
| /* PR 24753: Linker created sections can be larger than |
| the file size, eg if they are being used to hold stubs. */ |
| || (bfd_section_flags (sec) & SEC_LINKER_CREATED) != 0 |
| /* PR 24753: Sections which have no content should also be |
| excluded as they contain no size on disk. */ |
| || (bfd_section_flags (sec) & SEC_HAS_CONTENTS) == 0 |
| /* The MMO file format supports its own special compression |
| technique, but it uses COMPRESS_SECTION_NONE when loading |
| a section's contents. */ |
| || bfd_get_flavour (abfd) == bfd_target_mmo_flavour) |
| return false; |
| |
| ufile_ptr filesize = bfd_get_file_size (abfd); |
| if (filesize == 0) |
| return false; |
| |
| if (sec->compress_status == DECOMPRESS_SECTION_ZSTD |
| || sec->compress_status == DECOMPRESS_SECTION_ZLIB) |
| { |
| /* PR26946, PR28834: Sanity check compress header uncompressed |
| size against the original file size, and check that the |
| compressed section can be read from file. We choose an |
| arbitrary uncompressed size of 10x the file size, rather than |
| a compress ratio. The reason being that compiling |
| "int aaa..a;" with "a" repeated enough times can result in |
| compression ratios without limit for .debug_str, whereas such |
| a file will usually also have the enormous symbol |
| uncompressed in .symtab. */ |
| if (size / 10 > filesize) |
| { |
| bfd_set_error (bfd_error_bad_value); |
| return true; |
| } |
| size = sec->compressed_size; |
| } |
| |
| if ((ufile_ptr) sec->filepos > filesize || size > filesize - sec->filepos) |
| { |
| bfd_set_error (bfd_error_file_truncated); |
| return true; |
| } |
| return false; |
| } |