diff options
Diffstat (limited to 'gas/config/tc-arm.c')
| -rw-r--r-- | gas/config/tc-arm.c | 100 |
1 files changed, 17 insertions, 83 deletions
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c index 78d126c..83b0b21 100644 --- a/gas/config/tc-arm.c +++ b/gas/config/tc-arm.c @@ -1243,78 +1243,9 @@ validate_offset_imm (unsigned int val, int hwse) #ifdef OBJ_ELF /* This code is to handle mapping symbols as defined in the ARM ELF spec. - (This text is taken from version B-02 of the spec): - - 4.4.7 Mapping and tagging symbols - - A section of an ARM ELF file can contain a mixture of ARM code, - Thumb code, and data. There are inline transitions between code - and data at literal pool boundaries. There can also be inline - transitions between ARM code and Thumb code, for example in - ARM-Thumb inter-working veneers. Linkers, machine-level - debuggers, profiling tools, and disassembly tools need to map - images accurately. For example, setting an ARM breakpoint on a - Thumb location, or in a literal pool, can crash the program - being debugged, ruining the debugging session. - - ARM ELF entities are mapped (see section 4.4.7.1 below) and - tagged (see section 4.4.7.2 below) using local symbols (with - binding STB_LOCAL). To assist consumers, mapping and tagging - symbols should be collated first in the symbol table, before - other symbols with binding STB_LOCAL. - - To allow properly collated mapping and tagging symbols to be - skipped by consumers that have no interest in them, the first - such symbol should have the name $m and its st_value field equal - to the total number of mapping and tagging symbols (including - the $m) in the symbol table. - - 4.4.7.1 Mapping symbols - - $a Labels the first byte of a sequence of ARM instructions. - Its type is STT_FUNC. - - $d Labels the first byte of a sequence of data items. - Its type is STT_OBJECT. - - $t Labels the first byte of a sequence of Thumb instructions. - Its type is STT_FUNC. - - This list of mapping symbols may be extended in the future. - - Section-relative mapping symbols - - Mapping symbols defined in a section define a sequence of - half-open address intervals that cover the address range of the - section. Each interval starts at the address defined by a - mapping symbol, and continues up to, but not including, the - address defined by the next (in address order) mapping symbol or - the end of the section. A corollary is that there must be a - mapping symbol defined at the beginning of each section. - Consumers can ignore the size of a section-relative mapping - symbol. Producers can set it to 0. - - Absolute mapping symbols - - Because of the need to crystallize a Thumb address with the - Thumb-bit set, absolute symbol of type STT_FUNC (symbols of type - STT_FUNC defined in section SHN_ABS) need to be mapped with $a - or $t. - - The extent of a mapping symbol defined in SHN_ABS is [st_value, - st_value + st_size), or [st_value, st_value + 1) if st_size = 0, - where [x, y) denotes the half-open address range from x, - inclusive, to y, exclusive. - - In the absence of a mapping symbol, a consumer can interpret a - function symbol with an odd value as the Thumb code address - obtained by clearing the least significant bit of the - value. This interpretation is deprecated, and it may not work in - the future. - - Note - the Tagging symbols ($b, $f, $p $m) have been dropped from - the EABI (which is still under development), so they are not - implemented here. */ + (See "Mapping symbols", section 4.5.5, ARM AAELF version 1.0). + Note that previously, $a and $t has type STT_FUNC (BSF_OBJECT flag), + and $d has type STT_OBJECT (BSF_OBJECT flag). Now all three are untyped. */ static enum mstate mapstate = MAP_UNDEFINED; @@ -1336,15 +1267,15 @@ mapping_state (enum mstate state) { case MAP_DATA: symname = "$d"; - type = BSF_OBJECT; + type = BSF_NO_FLAGS; break; case MAP_ARM: symname = "$a"; - type = BSF_FUNCTION; + type = BSF_NO_FLAGS; break; case MAP_THUMB: symname = "$t"; - type = BSF_FUNCTION; + type = BSF_NO_FLAGS; break; case MAP_UNDEFINED: return; @@ -13738,14 +13669,17 @@ arm_adjust_symtab (void) elf_sym = elf_symbol (symbol_get_bfdsym (sym)); bind = ELF_ST_BIND (elf_sym->internal_elf_sym.st_info); - /* If it's a .thumb_func, declare it as so, - otherwise tag label as .code 16. */ - if (THUMB_IS_FUNC (sym)) - elf_sym->internal_elf_sym.st_info = - ELF_ST_INFO (bind, STT_ARM_TFUNC); - else - elf_sym->internal_elf_sym.st_info = - ELF_ST_INFO (bind, STT_ARM_16BIT); + if (! bfd_elf32_is_arm_mapping_symbol_name (elf_sym->symbol.name)) + { + /* If it's a .thumb_func, declare it as so, + otherwise tag label as .code 16. */ + if (THUMB_IS_FUNC (sym)) + elf_sym->internal_elf_sym.st_info = + ELF_ST_INFO (bind, STT_ARM_TFUNC); + else + elf_sym->internal_elf_sym.st_info = + ELF_ST_INFO (bind, STT_ARM_16BIT); + } } } #endif |