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| author | Hans-Peter Nilsson <hp@axis.com> | 2003-10-18 15:53:40 +0000 |
|---|---|---|
| committer | Hans-Peter Nilsson <hp@axis.com> | 2003-10-18 15:53:40 +0000 |
| commit | 88fc725d2fa9234fef229e80472740610172421b (patch) | |
| tree | 0270b842577e8d62dba87d7a61af5b912ae9c41b /gas/doc/c-mmix.texi | |
| parent | 06335781f67d53f9512551e31195e40d0b584f8f (diff) | |
| download | gdb-88fc725d2fa9234fef229e80472740610172421b.zip gdb-88fc725d2fa9234fef229e80472740610172421b.tar.gz gdb-88fc725d2fa9234fef229e80472740610172421b.tar.bz2 | |
Generate BFD_RELOC_MMIX_PUSHJ_STUBBABLE for PUSHJ when possible.
* doc/c-mmix.texi (MMIX-Opts): Document --no-pushj-stubs and
--no-stubs.
* config/tc-mmix.c: Include limits.h. Expand on mmix_relax_table
comment.
(expand_op, mmix_next_semicolon_is_eoln): Fix head comment.
(pushj_stubs): New variable.
(OPTION_NOPUSHJSTUBS, STATE_PUSHJSTUB, PUSHJSTUB_MIN)
(PUSHJSTUB_MAX): New macros.
(md_longopts): New options "--no-pushj-stubs" and synonym
"--no-stubs".
(mmix_relax_table): Handle new entry for STATE_PUSHJSTUB.
(md_parse_option): Handle OPTION_NOPUSHJSTUBS.
(md_estimate_size_before_relax): Modify STATE_PUSHJ state for
PUSHJ stub relaxation.
(md_convert_frag): Handle STATE_PUSHJSTUB.
(md_apply_fix3): Handle BFD_RELOC_MMIX_PUSHJ_STUBBABLE.
(tc_gen_reloc): Ditto.
(mmix_md_relax_frag): Handle PUSHJ stub relaxation.
* config/tc-mmix.h (TC_SEGMENT_INFO_TYPE): Define.
(struct mmix_segment_info_type): New.
Diffstat (limited to 'gas/doc/c-mmix.texi')
| -rw-r--r-- | gas/doc/c-mmix.texi | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/gas/doc/c-mmix.texi b/gas/doc/c-mmix.texi index d1b3016..a5205b6 100644 --- a/gas/doc/c-mmix.texi +++ b/gas/doc/c-mmix.texi @@ -82,6 +82,21 @@ that at link stage can be contracted. (Though linker relaxation isn't yet implemented in @code{@value{LD}}.) The option @samp{-x} also imples @samp{--linker-allocated-gregs}. +@cindex @samp{--no-pushj-stubs} command line option, MMIX +@cindex @samp{--no-stubs} command line option, MMIX +If instruction expansion is enabled, @code{@value{AS}} can expand a +@samp{PUSHJ} instruction into a series of instructions. The shortest +expansion is to not expand it, but just mark the call as redirectable to a +stub, which @code{@value{LD}} creates at link-time, but only if the +original @samp{PUSHJ} instruction is found not to reach the target. The +stub consists of the necessary instructions to form a jump to the target. +This happens if @code{@value{AS}} can assert that the @samp{PUSHJ} +instruction can reach such a stub. The option @samp{--no-pushj-stubs} +disables this shorter expansion, and the longer series of instructions is +then created at assembly-time. The option @samp{--no-stubs} is a synonym, +intended for compatibility with future releases, where generation of stubs +for other instructions may be implemented. + @cindex @samp{--linker-allocated-gregs} command line option, MMIX Usually a two-operand-expression (@pxref{GREG-base}) without a matching @samp{GREG} directive is treated as an error by @code{@value{AS}}. When |