From 01996a7a49bb278a50e72cb9a70011b8f907968e Mon Sep 17 00:00:00 2001 From: Thomas Koenig Date: Tue, 18 Apr 2023 11:21:58 +0100 Subject: [PATCH] Assembler Internal Docs: Describe handling of opcodes for relaxation a bit better. --- gas/ChangeLog | 5 +++++ gas/doc/internals.texi | 8 +++++--- 2 files changed, 10 insertions(+), 3 deletions(-) diff --git a/gas/ChangeLog b/gas/ChangeLog index e7db2d83197..760230dc7b6 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,8 @@ +2023-04-18 Thomas Koenig + + * doc/internals.texi (Relaxing with a table): Describe handling of + opcodes for relaxation a bit better. + 2023-04-13 Claudiu Zissulescu * testsuite/gas/cfi/cfi-arc-1.s: Use baseline instructions. diff --git a/gas/doc/internals.texi b/gas/doc/internals.texi index cb568d6edfd..56f10fd16fa 100644 --- a/gas/doc/internals.texi +++ b/gas/doc/internals.texi @@ -1824,9 +1824,11 @@ opcode field from the relaxable frag. It is not guaranteed to be the same frag. If you need to emit fixups for the opcode field from inspection of the relaxable frag, then you need to generate a common frag for both the basic opcode and relaxable fields, or you need to provide the frag for the opcode to -pass to @code{fix_new}. The latter can be done for example by defining -@code{TC_FRAG_TYPE} to include a pointer to it and defining @code{TC_FRAG_INIT} -to set the pointer. +pass to @code{fix_new}. The latter can be done by passing a pointer to the +opcode in the call to @code{frag_var} or @code{frag_variant}, and accessing +it via @code{fr_opcode}. See the @file{tc-vax.c} and @file{tc-m68k.c} for +examples. It is also possible for @code{TC_FRAG_TYPE} to include a pointer to +the opcode and defining @code{TC_FRAG_INIT} to set the pointer. Sometimes @code{fr_var} is increased instead, and @code{frag_wane} is not called. I'm not sure, but I think this is to keep @code{fr_fix} referring to -- 2.39.5