From 1502569cf9f47a0ce3357bff5379223fc5f43564 Mon Sep 17 00:00:00 2001 From: Nick Clifton Date: Wed, 21 Apr 2004 10:47:13 +0000 Subject: [PATCH] Add more documentation about h8300 relaxation. --- ld/ChangeLog | 6 ++++++ ld/ld.texinfo | 17 +++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/ld/ChangeLog b/ld/ChangeLog index ebb10b5130..7a5e139338 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,9 @@ +2004-04-21 Anil Paranjpe + + * ld.texinfo (synthesizing on H8/300): Information about linker + relaxation support for bit manipulation instructions and system + control instructions is added. + 2004-04-21 Hans-Peter Nilsson * NEWS: Mention change in DEFINED semantics. diff --git a/ld/ld.texinfo b/ld/ld.texinfo index 28dcf2e06a..0ba3af244e 100644 --- a/ld/ld.texinfo +++ b/ld/ld.texinfo @@ -4655,6 +4655,23 @@ page of memory, and changes them to use the eight-bit address form. (That is: the linker turns @samp{mov.b @code{@@}@var{aa}:16} into @samp{mov.b @code{@@}@var{aa}:8} whenever the address @var{aa} is in the top page of memory). + +@item bit manipulation instructions +@command{ld} finds all bit manipulation instructions like @code{band, bclr, +biand, bild, bior, bist, bixor, bld, bnot, bor, bset, bst, btst, bxor} +which use 32 bit and 16 bit absolute address form, but refer to the top +page of memory, and changes them to use the 8 bit address form. +(That is: the linker turns @samp{bset #xx:3,@code{@@}@var{aa}:32} into +@samp{bset #xx:3,@code{@@}@var{aa}:8} whenever the address @var{aa} is in +the top page of memory). + +@item system control instructions +@command{ld} finds all @code{ldc.w, stc.w} instrcutions which use the +32 bit absolute address form, but refer to the top page of memory, and +changes them to use 16 bit address form. +(That is: the linker turns @samp{ldc.w @code{@@}@var{aa}:32,ccr} into +@samp{ldc.w @code{@@}@var{aa}:16,ccr} whenever the address @var{aa} is in +the top page of memory). @end table @ifclear GENERIC