diff options
Diffstat (limited to 'contrib/binutils/bfd/doc/reloc.texi')
| -rw-r--r-- | contrib/binutils/bfd/doc/reloc.texi | 170 |
1 files changed, 127 insertions, 43 deletions
diff --git a/contrib/binutils/bfd/doc/reloc.texi b/contrib/binutils/bfd/doc/reloc.texi index 63c079e..fc4970d 100644 --- a/contrib/binutils/bfd/doc/reloc.texi +++ b/contrib/binutils/bfd/doc/reloc.texi @@ -16,14 +16,15 @@ in a particular section, and fill in the right bits of the structures. * typedef arelent:: * howto manager:: @end menu -@* + @node typedef arelent, howto manager, Relocations, Relocations @subsection typedef arelent This is the structure of a relocation entry: -@* -. + + @example + typedef enum bfd_reloc_status @{ /* No errors detected */ @@ -219,37 +220,39 @@ information in the reloc record and data section. A back end would normally have a relocation instruction set and turn relocations into pointers to the correct structure on input - but it would be possible to create each howto field on demand. -@* + @subsubsection @code{enum complain_overflow} Indicates what sort of overflow checking should be done when performing a relocation. -@* -. + + @example + enum complain_overflow @{ - /* Do not complain on overflow. */ + /* Do not complain on overflow. */ complain_overflow_dont, - /* Complain if the bitfield overflows, whether it is considered - as signed or unsigned. */ + /* Complain if the bitfield overflows, whether it is considered + as signed or unsigned. */ complain_overflow_bitfield, - /* Complain if the value overflows when considered as signed - number. */ + /* Complain if the value overflows when considered as signed + number. */ complain_overflow_signed, - /* Complain if the value overflows when considered as an - unsigned number. */ + /* Complain if the value overflows when considered as an + unsigned number. */ complain_overflow_unsigned @}; @end example @subsubsection @code{reloc_howto_type} The @code{reloc_howto_type} is a structure which contains all the information that libbfd needs to know to tie up a back end's data. -@* -.struct symbol_cache_entry; /* Forward declaration */ + + @example +struct symbol_cache_entry; /* Forward declaration */ struct reloc_howto_struct @{ @@ -265,13 +268,13 @@ struct reloc_howto_struct unwanted data from the relocation. */ unsigned int rightshift; - /* The size of the item to be relocated. This is *not* a - power-of-two measure. To get the number of bytes operated - on by a type of relocation, use bfd_get_reloc_size. */ + /* The size of the item to be relocated. This is *not* a + power-of-two measure. To get the number of bytes operated + on by a type of relocation, use bfd_get_reloc_size. */ int size; /* The number of bits in the item to be relocated. This is used - when doing overflow checking. */ + when doing overflow checking. */ unsigned int bitsize; /* Notes that the relocation is relative to the location in the @@ -280,12 +283,12 @@ struct reloc_howto_struct being relocated. */ boolean pc_relative; - /* The bit position of the reloc value in the destination. - The relocated value is left shifted by this amount. */ + /* The bit position of the reloc value in the destination. + The relocated value is left shifted by this amount. */ unsigned int bitpos; - /* What type of overflow error should be checked for when - relocating. */ + /* What type of overflow error should be checked for when + relocating. */ enum complain_overflow complain_on_overflow; /* If this field is non null, then the supplied function is @@ -293,8 +296,8 @@ struct reloc_howto_struct strange relocation methods to be accomodated (e.g., i960 callj instructions). */ bfd_reloc_status_type (*special_function) - PARAMS ((bfd *abfd, - arelent *reloc_entry, + PARAMS ((bfd *abfd, + arelent *reloc_entry, struct symbol_cache_entry *symbol, PTR data, asection *input_section, @@ -341,7 +344,7 @@ The HOWTO define is horrible and will go away. #define HOWTO(C, R,S,B, P, BI, O, SF, NAME, INPLACE, MASKSRC, MASKDST, PC) \ @{(unsigned)C,R,S,B, P, BI, O,SF,NAME,INPLACE,MASKSRC,MASKDST,PC@} @end example -@* + @strong{Description}@* And will be replaced with the totally magic way. But for the moment, we are compatible, so do it this way. @@ -349,7 +352,7 @@ moment, we are compatible, so do it this way. #define NEWHOWTO( FUNCTION, NAME,SIZE,REL,IN) HOWTO(0,0,SIZE,0,REL,0,complain_overflow_dont,FUNCTION, NAME,false,0,0,IN) @end example -@* + @strong{Description}@* Helper routine to turn a symbol into a relocation value. @example @@ -365,17 +368,17 @@ Helper routine to turn a symbol into a relocation value. @} \ @} @end example -@* + @findex bfd_get_reloc_size @subsubsection @code{bfd_get_reloc_size} @strong{Synopsis} @example -int bfd_get_reloc_size (reloc_howto_type *); +unsigned int bfd_get_reloc_size (reloc_howto_type *); @end example @strong{Description}@* For a reloc_howto_type that operates on a fixed number of bytes, this returns the number of bytes operated on. -@* + @findex arelent_chain @subsubsection @code{arelent_chain} @strong{Description}@* @@ -386,7 +389,24 @@ typedef struct relent_chain @{ struct relent_chain *next; @} arelent_chain; @end example -@* + +@findex bfd_check_overflow +@subsubsection @code{bfd_check_overflow} +@strong{Synopsis} +@example +bfd_reloc_status_type +bfd_check_overflow + (enum complain_overflow how, + unsigned int bitsize, + unsigned int rightshift, + bfd_vma relocation); +@end example +@strong{Description}@* +Perform overflow checking on @var{relocation} which has @var{bitsize} +significant bits and will be shifted right by @var{rightshift} bits. +The result is either of @code{bfd_reloc_ok} or +@code{bfd_reloc_overflow}. + @findex bfd_perform_relocation @subsubsection @code{bfd_perform_relocation} @strong{Synopsis} @@ -415,7 +435,7 @@ slot will always be big enough for the addend. Complex reloc types with addends were invented to solve just this problem. The @var{error_message} argument is set to an error message if this return @code{bfd_reloc_dangerous}. -@* + @findex bfd_install_relocation @subsubsection @code{bfd_install_relocation} @strong{Synopsis} @@ -436,14 +456,14 @@ a relocation. For now, this function should be considered reserved for the assembler. -@* + @node howto manager, , typedef arelent, Relocations @section The howto manager When an application wants to create a relocation, but doesn't know what the target machine might call it, it can find out by using this bit of code. -@* + @findex bfd_reloc_code_type @subsubsection @code{bfd_reloc_code_type} @strong{Description}@* @@ -455,7 +475,7 @@ return a howto pointer. This does mean that the application must determine the correct enumerator value; you can't get a howto pointer from a random set of attributes. -@* + Here are the possible values for @code{enum bfd_reloc_code_real}: @deffn {} BFD_RELOC_64 @@ -576,11 +596,18 @@ I think these are specific to SPARC a.out (e.g., Sun 4). @deffnx {} BFD_RELOC_SPARC_PC_LM22 @deffnx {} BFD_RELOC_SPARC_WDISP16 @deffnx {} BFD_RELOC_SPARC_WDISP19 -@deffnx {} BFD_RELOC_SPARC_GLOB_JMP @deffnx {} BFD_RELOC_SPARC_7 @deffnx {} BFD_RELOC_SPARC_6 @deffnx {} BFD_RELOC_SPARC_5 -Some relocations we're using for SPARC V9 -- subject to change. +@deffnx {} BFD_RELOC_SPARC_DISP64 +@deffnx {} BFD_RELOC_SPARC_PLT64 +@deffnx {} BFD_RELOC_SPARC_HIX22 +@deffnx {} BFD_RELOC_SPARC_LOX10 +@deffnx {} BFD_RELOC_SPARC_H44 +@deffnx {} BFD_RELOC_SPARC_M44 +@deffnx {} BFD_RELOC_SPARC_L44 +@deffnx {} BFD_RELOC_SPARC_REGISTER +SPARC64 relocations @end deffn @deffn {} BFD_RELOC_ALPHA_GPDISP_HI16 Alpha ECOFF and ELF relocations. Some of these treat the symbol or @@ -790,6 +817,23 @@ These relocs are only used within the ARM assembler. They are not @deffnx {} BFD_RELOC_SH_LABEL Hitachi SH relocs. Not all of these appear in object files. @end deffn +@deffn {} BFD_RELOC_THUMB_PCREL_BRANCH9 +@deffnx {} BFD_RELOC_THUMB_PCREL_BRANCH12 +@deffnx {} BFD_RELOC_THUMB_PCREL_BRANCH23 +Thumb 23-, 12- and 9-bit pc-relative branches. The lowest bit must +be zero and is not stored in the instruction. +@end deffn +@deffn {} BFD_RELOC_ARC_B22_PCREL +Argonaut RISC Core (ARC) relocs. +ARC 22 bit pc-relative branch. The lowest two bits must be zero and are +not stored in the instruction. The high 20 bits are installed in bits 26 +through 7 of the instruction. +@end deffn +@deffn {} BFD_RELOC_ARC_B26 +ARC 26 bit absolute branch. The lowest two bits must be zero and are not +stored in the instruction. The high 24 bits are installed in bits 23 +through 0. +@end deffn @deffn {} BFD_RELOC_D10V_10_PCREL_R Mitsubishi D10V relocs. This is a 10-bit reloc with the right 2 bits @@ -838,6 +882,40 @@ This is a 16-bit reloc containing the lower 16 bits of an address. This is a 16-bit reloc containing the small data area offset for use in add3, load, and store instructions. @end deffn +@deffn {} BFD_RELOC_V850_9_PCREL +This is a 9-bit reloc +@end deffn +@deffn {} BFD_RELOC_V850_22_PCREL +This is a 22-bit reloc +@end deffn +@deffn {} BFD_RELOC_V850_SDA_16_16_OFFSET +This is a 16 bit offset from the short data area pointer. +@end deffn +@deffn {} BFD_RELOC_V850_SDA_15_16_OFFSET +This is a 16 bit offset (of which only 15 bits are used) from the +short data area pointer. +@end deffn +@deffn {} BFD_RELOC_V850_ZDA_16_16_OFFSET +This is a 16 bit offset from the zero data area pointer. +@end deffn +@deffn {} BFD_RELOC_V850_ZDA_15_16_OFFSET +This is a 16 bit offset (of which only 15 bits are used) from the +zero data area pointer. +@end deffn +@deffn {} BFD_RELOC_V850_TDA_6_8_OFFSET +This is an 8 bit offset (of which only 6 bits are used) from the +tiny data area pointer. +@end deffn +@deffn {} BFD_RELOC_V850_TDA_7_8_OFFSET +This is an 8bit offset (of which only 7 bits are used) from the tiny +data area pointer. +@end deffn +@deffn {} BFD_RELOC_V850_TDA_7_7_OFFSET +This is a 7 bit offset from the tiny data area pointer. +@end deffn +@deffn {} BFD_RELOC_V850_TDA_16_16_OFFSET +This is a 16 bit offset from the tiny data area pointer. +@end deffn @deffn {} BFD_RELOC_MN10300_32_PCREL This is a 32bit pcrel reloc for the mn10300, offset by two bytes in the instruction. @@ -846,8 +924,14 @@ instruction. This is a 16bit pcrel reloc for the mn10300, offset by two bytes in the instruction. @end deffn -. +@deffn {} BFD_RELOC_TIC30_LDP +This is a 8bit DP reloc for the tms320c30, where the most +significant 8 bits of a 24 bit word are placed into the least +significant 8 bits of the opcode. +@end deffn + @example + typedef enum bfd_reloc_code_real bfd_reloc_code_real_type; @end example @findex bfd_reloc_type_lookup @@ -861,7 +945,7 @@ bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code); Return a pointer to a howto structure which, when invoked, will perform the relocation @var{code} on data from the architecture noted. -@* + @findex bfd_default_reloc_type_lookup @subsubsection @code{bfd_default_reloc_type_lookup} @strong{Synopsis} @@ -871,7 +955,7 @@ reloc_howto_type *bfd_default_reloc_type_lookup @end example @strong{Description}@* Provides a default relocation lookup routine for any architecture. -@* + @findex bfd_get_reloc_code_name @subsubsection @code{bfd_get_reloc_code_name} @strong{Synopsis} @@ -881,7 +965,7 @@ const char *bfd_get_reloc_code_name (bfd_reloc_code_real_type code); @strong{Description}@* Provides a printable name for the supplied relocation code. Useful mainly for printing error messages. -@* + @findex bfd_generic_relax_section @subsubsection @code{bfd_generic_relax_section} @strong{Synopsis} @@ -895,7 +979,7 @@ boolean bfd_generic_relax_section @strong{Description}@* Provides default handling for relaxing for back ends which don't do relaxing -- i.e., does nothing. -@* + @findex bfd_generic_get_relocated_section_contents @subsubsection @code{bfd_generic_get_relocated_section_contents} @strong{Synopsis} @@ -911,4 +995,4 @@ bfd_generic_get_relocated_section_contents (bfd *abfd, @strong{Description}@* Provides default handling of relocation effort for back ends which can't be bothered to do it efficiently. -@* + |
