/* tc-xtensa.h -- Header file for tc-xtensa.c.
- Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
enum xtensa_relax_statesE
{
+ RELAX_XTENSA_NONE,
+
RELAX_ALIGN_NEXT_OPCODE,
/* Use the first opcode of the next fragment to determine the
alignment requirements. This is ONLY used for LOOPs currently. */
RELAX_LOOP_END_ADD_NOP,
/* When the code density option is available, this will generate a
NOP.N marked RELAX_NARROW. Otherwise, it will create an rs_fill
- fragment with a NOP in it. */
+ fragment with a NOP in it. Once a frag has been converted to
+ RELAX_LOOP_END_ADD_NOP, it should never be changed back to
+ RELAX_LOOP_END. */
RELAX_LITERAL,
/* Another fragment could generate an expansion here but has not yet. */
RELAX_IMMED,
/* The last instruction in this fragment (at->fr_opcode) contains
- the value defined by fr_symbol (fr_offset = 0). If the value
- does not fit, use the specified expansion. This is similar to
- "NARROW", except that these may not be expanded in order to align
- code. */
+ an immediate or symbol. If the value does not fit, relax the
+ opcode using expansions from the relax table. */
RELAX_IMMED_STEP1,
/* The last instruction in this fragment (at->fr_opcode) contains a
- literal. It has already been expanded at least 1 step. */
+ literal. It has already been expanded 1 step. */
RELAX_IMMED_STEP2,
/* The last instruction in this fragment (at->fr_opcode) contains a
- literal. It has already been expanded at least 2 steps. */
+ literal. It has already been expanded 2 steps. */
+
+ RELAX_IMMED_STEP3,
+ /* The last instruction in this fragment (at->fr_opcode) contains a
+ literal. It has already been expanded 3 steps. */
RELAX_SLOTS,
/* There are instructions within the last VLIW instruction that need
branch is relaxed, then this frag will be converted to a
RELAX_UNREACHABLE frag. */
+ RELAX_ORG,
+ /* This marks the location as having previously been an rs_org frag.
+ rs_org frags are converted to fill-zero frags immediately after
+ relaxation. However, we need to remember where they were so we can
+ prevent the linker from changing the size of any frag between the
+ section start and the org frag. */
+
RELAX_NONE
};
/* This is used as a stopper to bound the number of steps that
can be taken. */
-#define RELAX_IMMED_MAXSTEPS (RELAX_IMMED_STEP2 - RELAX_IMMED)
+#define RELAX_IMMED_MAXSTEPS (RELAX_IMMED_STEP3 - RELAX_IMMED)
struct xtensa_frag_type
{
variable points to the frag where the literal will be stored. For
literal frags, this variable points to the nearest literal pool
location frag. This literal frag will be moved to after this
- location. */
+ location. For RELAX_LITERAL_POOL_BEGIN frags, this field points
+ to the frag immediately before the corresponding RELAX_LITERAL_POOL_END
+ frag, to make moving frags for this literal pool efficient. */
fragS *literal_frag;
/* The destination segment for literal frags. (Note that this is only
int literal_expansion[MAX_SLOTS];
int unreported_expansion;
+ /* For slots that have a free register for relaxation, record that
+ register. */
+ expressionS free_reg[MAX_SLOTS];
+
/* For text fragments that can generate literals at relax time: */
fragS *literal_frags[MAX_SLOTS];
enum xtensa_relax_statesE slot_subtypes[MAX_SLOTS];
symbolS *slot_symbols[MAX_SLOTS];
- symbolS *slot_sub_symbols[MAX_SLOTS];
offsetT slot_offsets[MAX_SLOTS];
- /* The global aligner needs to walk backward through the list of
- frags. This field is only valid after xtensa_end. */
- fragS *fr_prev;
+ /* When marking frags after this one in the chain as no transform,
+ cache the last one in the chain, so that we can skip to the
+ end of the chain. */
+ fragS *no_transform_end;
};
{
unsigned int is_loop_target : 1;
unsigned int is_branch_target : 1;
+ symbolS *next_expr_symbol;
} xtensa_symfield_type;
#define TC_FORCE_RELOCATION(fix) xtensa_force_relocation (fix)
#define TC_FORCE_RELOCATION_SUB_SAME(fix, seg) \
(! SEG_NORMAL (seg) || xtensa_force_relocation (fix))
-#define TC_VALIDATE_FIX_SUB(fix) xtensa_validate_fix_sub (fix)
+#define TC_VALIDATE_FIX_SUB(fix, seg) xtensa_validate_fix_sub (fix)
#define NO_PSEUDO_DOT xtensa_check_inside_bundle ()
#define tc_canonicalize_symbol_name(s) xtensa_section_rename (s)
#define tc_canonicalize_section_name(s) xtensa_section_rename (s)
#define tc_fix_adjustable(fix) xtensa_fix_adjustable (fix)
#define tc_frob_label(sym) xtensa_frob_label (sym)
#define tc_unrecognized_line(ch) xtensa_unrecognized_line (ch)
+#define tc_symbol_new_hook(sym) xtensa_symbol_new_hook (sym)
#define md_do_align(a,b,c,d,e) xtensa_flush_pending_output ()
#define md_elf_section_change_hook xtensa_elf_section_change_hook
#define md_end xtensa_end
#define md_relax_frag(segment, fragP, stretch) \
xtensa_relax_frag (fragP, stretch, &stretched)
+/* Only allow call frame debug info optimization when linker relaxation is
+ not enabled as otherwise we could generate the DWARF directives without
+ the relocs necessary to patch them up. */
+#define md_allow_eh_opt (linkrelax == 0)
#define LOCAL_LABELS_FB 1
#define WORKING_DOT_WORD 1
#define MD_APPLY_SYM_VALUE(FIX) 0
#define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
+/* Use line number format that is amenable to linker relaxation. */
+#define DWARF2_USE_FIXED_ADVANCE_PC (linkrelax != 0)
+
/* Resource reservation info functions. */
projects / deliverable / binutils-gdb.git / blobdiff