diff options
Diffstat (limited to 'contrib/binutils/gas/doc/internals.texi')
| -rw-r--r-- | contrib/binutils/gas/doc/internals.texi | 42 |
1 files changed, 35 insertions, 7 deletions
diff --git a/contrib/binutils/gas/doc/internals.texi b/contrib/binutils/gas/doc/internals.texi index ad57afd..eb9f44b 100644 --- a/contrib/binutils/gas/doc/internals.texi +++ b/contrib/binutils/gas/doc/internals.texi @@ -8,7 +8,7 @@ This chapter describes the internals of the assembler. It is incomplete, but it may help a bit. -This chapter was last modified on $Date: 1997/04/25 18:20:48 $. It is not updated regularly, and it +This chapter was last modified on $Date: 1998/02/06 03:42:57 $. It is not updated regularly, and it may be out of date. @menu @@ -469,11 +469,9 @@ This normally indicates the symbol to use when relaxing the frag according to @item fr_opcode Points to the lowest-addressed byte of the opcode, for use in relaxation. -@item fr_pcrel_adjust -@itemx fr_bsr -These fields are only used in the NS32k configuration. But since @code{struct -frag} is defined before the CPU-specific header files are included, they must -unconditionally be defined. +@item tc_frag_data +Target specific fragment data of type TC_FRAG_TYPE. +Only present if @code{TC_FRAG_TYPE} is defined. @item fr_file @itemx fr_line @@ -506,11 +504,26 @@ This indicates that ``broken word'' processing should be done (@pxref{Broken words}). If broken word processing is not necessary on the target machine, this enumerator value will not be defined. +@item rs_cfa +This state is used to implement exception frame optimizations. The +@code{fr_symbol} is an expression symbol for the subtraction which may be +relaxed. The @code{fr_opcode} field holds the frag for the preceding command +byte. The @code{fr_offset} field holds the offset within that frag. The +@code{fr_subtype} field is used during relaxation to hold the current size of +the frag. + @item rs_fill The variable characters are to be repeated @code{fr_offset} times. If @code{fr_offset} is 0, this frag has a length of @code{fr_fix}. Most frags have this type. +@item rs_leb128 +This state is used to implement the DWARF ``little endian base 128'' +variable length number format. The @code{fr_symbol} is always an expression +symbol, as constant expressions are emitted directly. The @code{fr_offset} +field is used during relaxation to hold the previous size of the number so +that we can determine if the fragment changed size. + @item rs_machine_dependent Displacement relaxation is to be done on this frag. The target is indicated by @code{fr_symbol} and @code{fr_offset}, and @code{fr_subtype} indicates the @@ -923,6 +936,21 @@ pseudo-op. @cindex TC_CONS_FIX_NEW You may define this macro to generate a fixup for a data allocation pseudo-op. +@item TC_INIT_FIX_DATA (@var{fixp}) +@cindex TC_INIT_FIX_DATA +A C statement to initialize the target specific fields of fixup @var{fixp}. +These fields are defined with the @code{TC_FIX_TYPE} macro. + +@item TC_FIX_DATA_PRINT (@var{stream}, @var{fixp}) +@cindex TC_FIX_DATA_PRINT +A C statement to output target specific debugging information for +fixup @var{fixp} to @var{stream}. This macro is called by @code{print_fixup}. + +@item TC_FRAG_INIT (@var{fragp}) +@cindex TC_FRAG_INIT +A C statement to initialize the target specific fields of frag @var{fragp}. +These fields are defined with the @code{TC_FRAG_TYPE} macro. + @item md_number_to_chars @cindex md_number_to_chars This should just call either @code{number_to_chars_bigendian} or @@ -1255,7 +1283,7 @@ the value to be stored is outside the range accessible by the current addressing mode. The @code{fr_symbol} field of the frag indicates what symbol is to be accessed; the @code{fr_offset} field is added in. -If the @code{fr_pcrel_adjust} field is set, which currently should only happen +If the @code{TC_PCREL_ADJUST} macro is defined, which currently should only happen for the NS32k family, the @code{TC_PCREL_ADJUST} macro is called on the frag to compute an adjustment to be made to the displacement. |
