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@@ -0,0 +1,977 @@
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+From a82c7d9030b67a6a76a5403d0e1641f9e42141ac Mon Sep 17 00:00:00 2001
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+From: David Weatherford <weath@cadence.com>
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+Date: Fri, 21 Mar 2014 11:53:42 +0000
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+Subject: [PATCH] Add support to the Xtensa target for creating trampolines for
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+ out-of-range branches.
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+
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+ * tc-xtensa.c (xtensa_check_frag_count, xtensa_create_trampoline_frag)
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+ (xtensa_maybe_create_trampoline_frag, init_trampoline_frag)
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+ (find_trampoline_seg, search_trampolines, get_best_trampoline)
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+ (check_and_update_trampolines, add_jump_to_trampoline)
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+ (dump_trampolines): New function.
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+ (md_parse_option): Add cases for --[no-]trampolines options.
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+ (md_assemble, finish_vinsn, xtensa_end): Add call to
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+ xtensa_check_frag_count.
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+ (xg_assemble_vliw_tokens): Add call to
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+ xtensa_maybe_create_trampoline_frag.
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+ (xtensa_relax_frag): Relax fragments with RELAX_TRAMPOLINE state.
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+ (relax_frag_immed): Relax jump instructions that cannot reach its
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+ target.
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+ * tc-xtensa.h (xtensa_relax_statesE::RELAX_TRAMPOLINE): New relax
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+ state.
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+
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+ * as.texinfo: Document --[no-]trampolines command-line options.
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+ * c-xtensa.texi: Document trampolines relaxation and command line
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+ options.
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+
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+ * frags.c (get_frag_count, clear_frag_count): New function.
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+ (frag_alloc): Increment totalfrags counter.
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+ * frags.h (get_frag_count, clear_frag_count): New function.
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+
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+ * all.exp: Add test for trampoline relaxation.
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+ * trampoline.d: Trampoline relaxation expected dump.
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+ * trampoline.s: Trampoline relaxation test source.
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+---
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+Backported from: a82c7d9030b67a6a76a5403d0e1641f9e42141ac
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+Changes to Changelog files are dropped.
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+
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+ gas/config/tc-xtensa.c | 558 +++++++++++++++++++++++++++++++++-
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+ gas/config/tc-xtensa.h | 5 +
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+ gas/doc/as.texinfo | 1 +
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+ gas/doc/c-xtensa.texi | 92 ++++++
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+ gas/frags.c | 15 +
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+ gas/frags.h | 3 +
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+ gas/testsuite/gas/xtensa/all.exp | 1 +
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+ gas/testsuite/gas/xtensa/trampoline.d | 26 ++
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+ gas/testsuite/gas/xtensa/trampoline.s | 21 ++
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+ 11 files changed, 753 insertions(+), 2 deletions(-)
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+ create mode 100644 gas/testsuite/gas/xtensa/trampoline.d
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+ create mode 100644 gas/testsuite/gas/xtensa/trampoline.s
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+
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+diff --git a/gas/config/tc-xtensa.c b/gas/config/tc-xtensa.c
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+index fe8ec0f..ea23c96 100644
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+--- a/gas/config/tc-xtensa.c
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++++ b/gas/config/tc-xtensa.c
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+@@ -468,6 +468,12 @@ static void xtensa_set_frag_assembly_state (fragS *);
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+ static void finish_vinsn (vliw_insn *);
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+ static bfd_boolean emit_single_op (TInsn *);
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+ static int total_frag_text_expansion (fragS *);
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++static bfd_boolean use_trampolines = TRUE;
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++static void xtensa_check_frag_count (void);
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++static void xtensa_create_trampoline_frag (bfd_boolean);
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++static void xtensa_maybe_create_trampoline_frag (void);
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++struct trampoline_frag;
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++static int init_trampoline_frag (struct trampoline_frag *);
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+
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+ /* Alignment Functions. */
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+
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+@@ -520,6 +526,7 @@ static void tinsn_from_chars (TInsn *, char *, int);
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+ static void tinsn_immed_from_frag (TInsn *, fragS *, int);
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+ static int get_num_stack_text_bytes (IStack *);
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+ static int get_num_stack_literal_bytes (IStack *);
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++static bfd_boolean tinsn_to_slotbuf (xtensa_format, int, TInsn *, xtensa_insnbuf);
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+
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+ /* vliw_insn functions. */
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+
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+@@ -687,7 +694,10 @@ enum
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+ option_prefer_l32r,
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+ option_prefer_const16,
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+
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+- option_target_hardware
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++ option_target_hardware,
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++
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++ option_trampolines,
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++ option_no_trampolines,
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+ };
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+
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+ const char *md_shortopts = "";
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+@@ -760,6 +770,9 @@ struct option md_longopts[] =
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+
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+ { "target-hardware", required_argument, NULL, option_target_hardware },
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+
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++ { "trampolines", no_argument, NULL, option_trampolines },
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++ { "no-trampolines", no_argument, NULL, option_no_trampolines },
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++
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+ { NULL, no_argument, NULL, 0 }
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+ };
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+
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+@@ -940,6 +953,14 @@ md_parse_option (int c, char *arg)
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+ directive_state[directive_transform] = FALSE;
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+ return 1;
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+
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++ case option_trampolines:
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++ use_trampolines = TRUE;
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++ return 1;
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++
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++ case option_no_trampolines:
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++ use_trampolines = FALSE;
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++ return 1;
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++
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+ default:
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+ return 0;
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+ }
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+@@ -963,7 +984,9 @@ Xtensa options:\n\
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+ flix bundles\n\
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+ --no-allow-flix neither allow hand-written nor generate\n\
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+ flix bundles\n\
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+- --rename-section old=new Rename section 'old' to 'new'\n", stream);
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++ --rename-section old=new Rename section 'old' to 'new'\n\
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++ --[no-]trampolines [Do not] generate trampolines (jumps to jumps)\n\
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++ when jumps do not reach their targets\n", stream);
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+ }
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+
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+
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+@@ -5568,6 +5591,8 @@ md_assemble (char *str)
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+
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+ /* We've just emitted a new instruction so clear the list of labels. */
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+ xtensa_clear_insn_labels ();
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++
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++ xtensa_check_frag_count ();
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+ }
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+
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+
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+@@ -6372,6 +6397,8 @@ finish_vinsn (vliw_insn *vinsn)
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+ xg_assemble_vliw_tokens (vinsn);
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+
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+ xg_clear_vinsn (vinsn);
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++
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++ xtensa_check_frag_count ();
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+ }
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+
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+
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+@@ -7140,6 +7167,7 @@ xg_assemble_vliw_tokens (vliw_insn *vinsn)
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+ RELAX_UNREACHABLE,
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+ frag_now->fr_symbol, frag_now->fr_offset, NULL);
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+ xtensa_set_frag_assembly_state (frag_now);
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++ xtensa_maybe_create_trampoline_frag ();
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+ }
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+ else if (is_branch && do_align_targets ())
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+ {
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+@@ -7222,9 +7250,164 @@ xtensa_end (void)
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+ xtensa_sanity_check ();
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+
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+ xtensa_add_config_info ();
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++
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++ xtensa_check_frag_count ();
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++}
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++
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++
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++struct trampoline_frag
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++{
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++ struct trampoline_frag *next;
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++ bfd_boolean needs_jump_around;
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++ fragS *fragP;
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++ fixS *fixP;
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++};
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++
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++struct trampoline_seg
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++{
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++ struct trampoline_seg *next;
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++ asection *seg;
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++ struct trampoline_frag trampoline_list;
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++};
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++
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++static struct trampoline_seg trampoline_seg_list;
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++#define J_RANGE (128 * 1024)
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++
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++static int unreachable_count = 0;
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++
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++
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++static void
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++xtensa_maybe_create_trampoline_frag (void)
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++{
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++ if (!use_trampolines)
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++ return;
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++
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++ /* We create an area for possible trampolines every 10 unreachable frags.
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++ These are preferred over the ones not preceded by an unreachable frag,
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++ because we don't have to jump around them. This function is called after
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++ each RELAX_UNREACHABLE frag is created. */
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++
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++ if (++unreachable_count > 10)
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++ {
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++ xtensa_create_trampoline_frag (FALSE);
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++ clear_frag_count ();
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++ unreachable_count = 0;
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++ }
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++}
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++
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++static void
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++xtensa_check_frag_count (void)
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++{
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++ if (!use_trampolines || frag_now->tc_frag_data.is_no_transform)
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++ return;
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++
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++ /* We create an area for possible trampolines every 8000 frags or so. This
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++ is an estimate based on the max range of a "j" insn (+/-128K) divided
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++ by a typical frag byte count (16), minus a few for safety. This function
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++ is called after each source line is processed. */
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++
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++ if (get_frag_count () > 8000)
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++ {
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++ xtensa_create_trampoline_frag (TRUE);
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++ clear_frag_count ();
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++ unreachable_count = 0;
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++ }
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++}
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++
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++static xtensa_insnbuf trampoline_buf = NULL;
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++static xtensa_insnbuf trampoline_slotbuf = NULL;
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++
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++#define TRAMPOLINE_FRAG_SIZE 3000
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++
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++static void
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++xtensa_create_trampoline_frag (bfd_boolean needs_jump_around)
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++{
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++ /* Emit a frag where we can place intermediate jump instructions,
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++ in case we need to jump farther than 128K bytes.
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++ Each jump instruction takes three bytes.
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++ We allocate enough for 1000 trampolines in each frag.
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++ If that's not enough, oh well. */
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++
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++ struct trampoline_seg *ts = trampoline_seg_list.next;
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++ struct trampoline_frag *tf;
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++ char *varP;
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++ fragS *fragP;
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++ int size = TRAMPOLINE_FRAG_SIZE;
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++
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++ for ( ; ts; ts = ts->next)
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++ {
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++ if (ts->seg == now_seg)
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++ break;
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++ }
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++
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++ if (ts == NULL)
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++ {
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++ ts = (struct trampoline_seg *)xcalloc(sizeof (struct trampoline_seg), 1);
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++ ts->next = trampoline_seg_list.next;
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++ trampoline_seg_list.next = ts;
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++ ts->seg = now_seg;
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++ }
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++
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++ frag_wane (frag_now);
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++ frag_new (0);
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++ xtensa_set_frag_assembly_state (frag_now);
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++ varP = frag_var (rs_machine_dependent, size, size, RELAX_TRAMPOLINE, NULL, 0, NULL);
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++ fragP = (fragS *)(varP - SIZEOF_STRUCT_FRAG);
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++ if (trampoline_buf == NULL)
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++ {
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++ trampoline_buf = xtensa_insnbuf_alloc (xtensa_default_isa);
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++ trampoline_slotbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
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++ }
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++ tf = (struct trampoline_frag *)xmalloc(sizeof (struct trampoline_frag));
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++ tf->next = ts->trampoline_list.next;
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++ ts->trampoline_list.next = tf;
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++ tf->needs_jump_around = needs_jump_around;
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++ tf->fragP = fragP;
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++ tf->fixP = NULL;
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++}
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++
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++
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++static struct trampoline_seg *
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++find_trampoline_seg (asection *seg)
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++{
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++ struct trampoline_seg *ts = trampoline_seg_list.next;
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++
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++ for ( ; ts; ts = ts->next)
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++ {
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++ if (ts->seg == seg)
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++ return ts;
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++ }
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++
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++ return NULL;
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+ }
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+
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+
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++void dump_trampolines (void);
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++
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++void
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++dump_trampolines (void)
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++{
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++ struct trampoline_seg *ts = trampoline_seg_list.next;
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++
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++ for ( ; ts; ts = ts->next)
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++ {
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++ asection *seg = ts->seg;
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++
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++ if (seg == NULL)
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++ continue;
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++ fprintf(stderr, "SECTION %s\n", seg->name);
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++ struct trampoline_frag *tf = ts->trampoline_list.next;
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++ for ( ; tf; tf = tf->next)
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++ {
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++ if (tf->fragP == NULL)
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++ continue;
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++ fprintf(stderr, " 0x%08x: fix=%d, jump_around=%s\n",
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++ (int)tf->fragP->fr_address, (int)tf->fragP->fr_fix,
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++ tf->needs_jump_around ? "T" : "F");
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++ }
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++ }
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++}
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++
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+ static void
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+ xtensa_cleanup_align_frags (void)
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+ {
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+@@ -8708,6 +8891,149 @@ xtensa_relax_frag (fragS *fragP, long stretch, int *stretched_p)
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+ new_stretch += relax_frag_for_align (fragP, stretch);
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+ break;
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+
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++ case RELAX_TRAMPOLINE:
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++ if (fragP->tc_frag_data.relax_seen)
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++ {
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++ segment_info_type *seginfo = seg_info (now_seg);
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++ fragS *fP; /* The out-of-range jump. */
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++ fixS *fixP;
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++
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++ /* Scan for jumps that will not reach. */
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++ for (fixP = seginfo->fix_root; fixP ; fixP = fixP->fx_next)
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++ {
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++ symbolS *s = fixP->fx_addsy;
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++ xtensa_opcode opcode;
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++ int target;
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++ int addr;
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++ int delta;
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++
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++ if (fixP->fx_r_type < BFD_RELOC_XTENSA_SLOT0_OP ||
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++ fixP->fx_r_type > BFD_RELOC_XTENSA_SLOT14_OP)
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++ continue;
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++ xtensa_insnbuf_from_chars (isa, trampoline_buf,
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++ (unsigned char *) fixP->fx_frag->fr_literal + fixP->fx_where,
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++ 0);
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++ fmt = xtensa_format_decode (isa, trampoline_buf);
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++ gas_assert (fmt != XTENSA_UNDEFINED);
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++ slot = fixP->tc_fix_data.slot;
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++ xtensa_format_get_slot (isa, fmt, slot, trampoline_buf, trampoline_slotbuf);
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++ opcode = xtensa_opcode_decode (isa, fmt, slot, trampoline_slotbuf);
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++ if (opcode != xtensa_j_opcode)
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++ continue;
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++ target = S_GET_VALUE (s);
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++ addr = fixP->fx_frag->fr_address;
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++ delta = target - addr + stretch;
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++ if (delta > J_RANGE || delta < -1 * J_RANGE)
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++ { /* Found an out-of-range jump; scan the list of trampolines for the best match. */
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++ struct trampoline_seg *ts = find_trampoline_seg (now_seg);
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++ struct trampoline_frag *tf = ts->trampoline_list.next;
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++ struct trampoline_frag *prev = &ts->trampoline_list;
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++ int lower = (target < addr) ? target : addr;
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++ int upper = (target > addr) ? target : addr;
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++ int midpoint = lower + (upper - lower) / 2;
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++
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++ if ((upper - lower) > 2 * J_RANGE)
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++ {
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++ /* One trampoline won't suffice; we need multiple jumps.
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++ Jump to the trampoline that's farthest, but still in
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++ range relative to the original "j" instruction. */
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++ for ( ; tf; prev = tf, tf = tf->next )
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++ {
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++ int this_addr = tf->fragP->fr_address + tf->fragP->fr_fix;
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++ int next_addr = (tf->next) ? tf->next->fragP->fr_address + tf->next->fragP->fr_fix : 0 ;
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++
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++ if (addr == lower)
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++ {
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++ /* Forward jump. */
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++ if (this_addr - addr < J_RANGE)
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++ break;
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++ }
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++ else
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++ {
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++ /* Backward jump. */
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++ if (next_addr == 0 || addr - next_addr > J_RANGE)
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++ break;
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++ }
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++ }
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++ }
|
|
|
++ else
|
|
|
++ {
|
|
|
++ struct trampoline_frag *best_tf = NULL;
|
|
|
++ int best_delta = 0;
|
|
|
++
|
|
|
++ for ( ; tf; prev = tf, tf = tf->next )
|
|
|
++ {
|
|
|
++ int this_addr = tf->fragP->fr_address + tf->fragP->fr_fix;
|
|
|
++ int this_delta = abs (this_addr - midpoint);
|
|
|
++
|
|
|
++ if (!best_tf || this_delta < best_delta)
|
|
|
++ {
|
|
|
++ best_tf = tf;
|
|
|
++ best_delta = this_delta;
|
|
|
++ }
|
|
|
++ }
|
|
|
++ tf = best_tf;
|
|
|
++ }
|
|
|
++ if (tf->fragP == fragP)
|
|
|
++ {
|
|
|
++ int trampaddr = fragP->fr_address + fragP->fr_fix;
|
|
|
++
|
|
|
++ if (abs (addr - trampaddr) < J_RANGE)
|
|
|
++ { /* The trampoline is in range of original; fix it! */
|
|
|
++ fixS *newfixP;
|
|
|
++ int offset;
|
|
|
++ TInsn insn;
|
|
|
++ symbolS *lsym;
|
|
|
++
|
|
|
++ new_stretch += init_trampoline_frag (tf);
|
|
|
++ offset = fragP->fr_fix; /* Where to assemble the j insn. */
|
|
|
++ lsym = fragP->fr_symbol;
|
|
|
++ fP = fixP->fx_frag;
|
|
|
++ /* Assemble a jump to the target label here. */
|
|
|
++ tinsn_init (&insn);
|
|
|
++ insn.insn_type = ITYPE_INSN;
|
|
|
++ insn.opcode = xtensa_j_opcode;
|
|
|
++ insn.ntok = 1;
|
|
|
++ set_expr_symbol_offset (&insn.tok[0], lsym, offset);
|
|
|
++ fmt = xg_get_single_format (xtensa_j_opcode);
|
|
|
++ tinsn_to_slotbuf (fmt, 0, &insn, trampoline_slotbuf);
|
|
|
++ xtensa_format_set_slot (isa, fmt, 0, trampoline_buf, trampoline_slotbuf);
|
|
|
++ xtensa_insnbuf_to_chars (isa, trampoline_buf, (unsigned char *)fragP->fr_literal + offset, 3);
|
|
|
++ fragP->fr_fix += 3;
|
|
|
++ fragP->fr_var -= 3;
|
|
|
++ /* Add a fix-up for the original j insn. */
|
|
|
++ newfixP = fix_new (fP, fixP->fx_where, fixP->fx_size, lsym, fragP->fr_fix - 3, TRUE, fixP->fx_r_type);
|
|
|
++ newfixP->fx_no_overflow = 1;
|
|
|
++ newfixP->tc_fix_data.X_add_symbol = lsym;
|
|
|
++ newfixP->tc_fix_data.X_add_number = offset;
|
|
|
++ newfixP->tc_fix_data.slot = slot;
|
|
|
++ /* Move the fix-up from the original j insn to this one. */
|
|
|
++ fixP->fx_frag = fragP;
|
|
|
++ fixP->fx_where = fragP->fr_fix - 3;
|
|
|
++ fixP->tc_fix_data.slot = 0;
|
|
|
++ /* Adjust the jump around this trampoline (if present). */
|
|
|
++ if (tf->fixP != NULL)
|
|
|
++ {
|
|
|
++ tf->fixP->fx_offset += 3;
|
|
|
++ }
|
|
|
++ new_stretch += 3;
|
|
|
++ fragP->tc_frag_data.relax_seen = FALSE; /* Need another pass. */
|
|
|
++ /* Do we have room for more? */
|
|
|
++ if (fragP->fr_var < 3)
|
|
|
++ { /* No, convert to fill. */
|
|
|
++ frag_wane (fragP);
|
|
|
++ fragP->fr_subtype = 0;
|
|
|
++ /* Remove from the trampoline_list. */
|
|
|
++ prev->next = tf->next;
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ }
|
|
|
++ }
|
|
|
++ }
|
|
|
++ }
|
|
|
++ }
|
|
|
++ break;
|
|
|
++
|
|
|
+ default:
|
|
|
+ as_bad (_("bad relaxation state"));
|
|
|
+ }
|
|
|
+@@ -9146,6 +9472,200 @@ bytes_to_stretch (fragS *this_frag,
|
|
|
+ }
|
|
|
+
|
|
|
+
|
|
|
++static struct trampoline_frag *
|
|
|
++search_trampolines (TInsn *tinsn, fragS *fragP, bfd_boolean unreachable_only)
|
|
|
++{
|
|
|
++ struct trampoline_seg *ts = find_trampoline_seg (now_seg);
|
|
|
++ struct trampoline_frag *tf = (ts) ? ts->trampoline_list.next : NULL;
|
|
|
++ struct trampoline_frag *best_tf = NULL;
|
|
|
++ int best_delta = 0;
|
|
|
++ int best_addr = 0;
|
|
|
++ symbolS *sym = tinsn->tok[0].X_add_symbol;
|
|
|
++ offsetT target = S_GET_VALUE (sym) + tinsn->tok[0].X_add_number;
|
|
|
++ offsetT addr = fragP->fr_address;
|
|
|
++ offsetT lower = (addr < target) ? addr : target;
|
|
|
++ offsetT upper = (addr > target) ? addr : target;
|
|
|
++ int delta = upper - lower;
|
|
|
++ offsetT midpoint = lower + delta / 2;
|
|
|
++ int this_delta = -1;
|
|
|
++ int this_addr = -1;
|
|
|
++
|
|
|
++ if (delta > 2 * J_RANGE)
|
|
|
++ {
|
|
|
++ /* One trampoline won't do; we need multiple.
|
|
|
++ Choose the farthest trampoline that's still in range of the original
|
|
|
++ and let a later pass finish the job. */
|
|
|
++ for ( ; tf; tf = tf->next)
|
|
|
++ {
|
|
|
++ int next_addr = (tf->next) ? tf->next->fragP->fr_address + tf->next->fragP->fr_fix : 0;
|
|
|
++
|
|
|
++ this_addr = tf->fragP->fr_address + tf->fragP->fr_fix;
|
|
|
++ if (lower == addr)
|
|
|
++ {
|
|
|
++ /* Forward jump. */
|
|
|
++ if (this_addr - addr < J_RANGE)
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ else
|
|
|
++ {
|
|
|
++ /* Backward jump. */
|
|
|
++ if (next_addr == 0 || addr - next_addr > J_RANGE)
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ if (abs (addr - this_addr) < J_RANGE)
|
|
|
++ return tf;
|
|
|
++
|
|
|
++ return NULL;
|
|
|
++ }
|
|
|
++ }
|
|
|
++ for ( ; tf; tf = tf->next)
|
|
|
++ {
|
|
|
++ this_addr = tf->fragP->fr_address + tf->fragP->fr_fix;
|
|
|
++ this_delta = abs (this_addr - midpoint);
|
|
|
++ if (unreachable_only && tf->needs_jump_around)
|
|
|
++ continue;
|
|
|
++ if (!best_tf || this_delta < best_delta)
|
|
|
++ {
|
|
|
++ best_tf = tf;
|
|
|
++ best_delta = this_delta;
|
|
|
++ best_addr = this_addr;
|
|
|
++ }
|
|
|
++ }
|
|
|
++
|
|
|
++ if (best_tf &&
|
|
|
++ best_delta < J_RANGE &&
|
|
|
++ abs(best_addr - lower) < J_RANGE &&
|
|
|
++ abs(best_addr - upper) < J_RANGE)
|
|
|
++ return best_tf;
|
|
|
++
|
|
|
++ return NULL; /* No suitable trampoline found. */
|
|
|
++}
|
|
|
++
|
|
|
++
|
|
|
++static struct trampoline_frag *
|
|
|
++get_best_trampoline (TInsn *tinsn, fragS *fragP)
|
|
|
++{
|
|
|
++ struct trampoline_frag *tf = NULL;
|
|
|
++
|
|
|
++ tf = search_trampolines (tinsn, fragP, TRUE); /* Try unreachable first. */
|
|
|
++
|
|
|
++ if (tf == NULL)
|
|
|
++ tf = search_trampolines (tinsn, fragP, FALSE); /* Try ones needing a jump-around, too. */
|
|
|
++
|
|
|
++ return tf;
|
|
|
++}
|
|
|
++
|
|
|
++
|
|
|
++static void
|
|
|
++check_and_update_trampolines (void)
|
|
|
++{
|
|
|
++ struct trampoline_seg *ts = find_trampoline_seg (now_seg);
|
|
|
++ struct trampoline_frag *tf = ts->trampoline_list.next;
|
|
|
++ struct trampoline_frag *prev = &ts->trampoline_list;
|
|
|
++
|
|
|
++ for ( ; tf; prev = tf, tf = tf->next)
|
|
|
++ {
|
|
|
++ if (tf->fragP->fr_var < 3)
|
|
|
++ {
|
|
|
++ frag_wane (tf->fragP);
|
|
|
++ prev->next = tf->next;
|
|
|
++ tf->fragP = NULL;
|
|
|
++ }
|
|
|
++ }
|
|
|
++}
|
|
|
++
|
|
|
++
|
|
|
++static int
|
|
|
++init_trampoline_frag (struct trampoline_frag *trampP)
|
|
|
++{
|
|
|
++ fragS *fp = trampP->fragP;
|
|
|
++ int growth = 0;
|
|
|
++
|
|
|
++ if (fp->fr_fix == 0)
|
|
|
++ {
|
|
|
++ symbolS *lsym;
|
|
|
++ char label[10 + 2 * sizeof(fp)];
|
|
|
++ sprintf (label, ".L0_TR_%p", fp);
|
|
|
++
|
|
|
++ lsym = (symbolS *)local_symbol_make (label, now_seg, 0, fp);
|
|
|
++ fp->fr_symbol = lsym;
|
|
|
++ if (trampP->needs_jump_around)
|
|
|
++ {
|
|
|
++ /* Add a jump around this block of jumps, in case
|
|
|
++ control flows into this block. */
|
|
|
++ fixS *fixP;
|
|
|
++ TInsn insn;
|
|
|
++ xtensa_format fmt;
|
|
|
++ xtensa_isa isa = xtensa_default_isa;
|
|
|
++
|
|
|
++ fp->tc_frag_data.is_insn = 1;
|
|
|
++ /* Assemble a jump insn. */
|
|
|
++ tinsn_init (&insn);
|
|
|
++ insn.insn_type = ITYPE_INSN;
|
|
|
++ insn.opcode = xtensa_j_opcode;
|
|
|
++ insn.ntok = 1;
|
|
|
++ set_expr_symbol_offset (&insn.tok[0], lsym, 3);
|
|
|
++ fmt = xg_get_single_format (xtensa_j_opcode);
|
|
|
++ tinsn_to_slotbuf (fmt, 0, &insn, trampoline_slotbuf);
|
|
|
++ xtensa_format_set_slot (isa, fmt, 0, trampoline_buf, trampoline_slotbuf);
|
|
|
++ xtensa_insnbuf_to_chars (isa, trampoline_buf, (unsigned char *)fp->fr_literal, 3);
|
|
|
++ fp->fr_fix += 3;
|
|
|
++ fp->fr_var -= 3;
|
|
|
++ growth = 3;
|
|
|
++ fixP = fix_new (fp, 0, 3, lsym, 3, TRUE, BFD_RELOC_XTENSA_SLOT0_OP);
|
|
|
++ trampP->fixP = fixP;
|
|
|
++ }
|
|
|
++ }
|
|
|
++ return growth;
|
|
|
++}
|
|
|
++
|
|
|
++
|
|
|
++static int
|
|
|
++add_jump_to_trampoline (struct trampoline_frag *trampP, fragS *origfrag)
|
|
|
++{
|
|
|
++ fragS *tramp = trampP->fragP;
|
|
|
++ fixS *fixP;
|
|
|
++ int offset = tramp->fr_fix; /* Where to assemble the j insn. */
|
|
|
++ TInsn insn;
|
|
|
++ symbolS *lsym;
|
|
|
++ symbolS *tsym;
|
|
|
++ int toffset;
|
|
|
++ xtensa_format fmt;
|
|
|
++ xtensa_isa isa = xtensa_default_isa;
|
|
|
++ int growth = 0;
|
|
|
++
|
|
|
++ lsym = tramp->fr_symbol;
|
|
|
++ /* Assemble a jump to the target label in the trampoline frag. */
|
|
|
++ tsym = origfrag->tc_frag_data.slot_symbols[0];
|
|
|
++ toffset = origfrag-> tc_frag_data.slot_offsets[0];
|
|
|
++ tinsn_init (&insn);
|
|
|
++ insn.insn_type = ITYPE_INSN;
|
|
|
++ insn.opcode = xtensa_j_opcode;
|
|
|
++ insn.ntok = 1;
|
|
|
++ set_expr_symbol_offset (&insn.tok[0], tsym, toffset);
|
|
|
++ fmt = xg_get_single_format (xtensa_j_opcode);
|
|
|
++ tinsn_to_slotbuf (fmt, 0, &insn, trampoline_slotbuf);
|
|
|
++ xtensa_format_set_slot (isa, fmt, 0, trampoline_buf, trampoline_slotbuf);
|
|
|
++ xtensa_insnbuf_to_chars (isa, trampoline_buf, (unsigned char *)tramp->fr_literal + offset, 3);
|
|
|
++ tramp->fr_fix += 3;
|
|
|
++ tramp->fr_var -= 3;
|
|
|
++ growth = 3;
|
|
|
++ /* add a fix-up for the trampoline jump. */
|
|
|
++ fixP = fix_new (tramp, tramp->fr_fix - 3, 3, tsym, toffset, TRUE, BFD_RELOC_XTENSA_SLOT0_OP);
|
|
|
++ /* Modify the jump at the start of this trampoline to point past the newly-added jump. */
|
|
|
++ fixP = trampP->fixP;
|
|
|
++ if (fixP)
|
|
|
++ fixP->fx_offset += 3;
|
|
|
++ /* Modify the original j to point here. */
|
|
|
++ origfrag->tc_frag_data.slot_symbols[0] = lsym;
|
|
|
++ origfrag->tc_frag_data.slot_offsets[0] = tramp->fr_fix - 3;
|
|
|
++ /* If trampoline is full, remove it from the list. */
|
|
|
++ check_and_update_trampolines ();
|
|
|
++
|
|
|
++ return growth;
|
|
|
++}
|
|
|
++
|
|
|
++
|
|
|
+ static long
|
|
|
+ relax_frag_immed (segT segP,
|
|
|
+ fragS *fragP,
|
|
|
+@@ -9284,6 +9804,37 @@ relax_frag_immed (segT segP,
|
|
|
+ if (negatable_branch && istack.ninsn > 1)
|
|
|
+ update_next_frag_state (fragP);
|
|
|
+
|
|
|
++ /* If last insn is a jump, and it cannot reach its target, try to find a trampoline. */
|
|
|
++ if (istack.ninsn > 2 &&
|
|
|
++ istack.insn[istack.ninsn - 1].insn_type == ITYPE_LABEL &&
|
|
|
++ istack.insn[istack.ninsn - 2].insn_type == ITYPE_INSN &&
|
|
|
++ istack.insn[istack.ninsn - 2].opcode == xtensa_j_opcode)
|
|
|
++ {
|
|
|
++ TInsn *jinsn = &istack.insn[istack.ninsn - 2];
|
|
|
++
|
|
|
++ if (!xg_symbolic_immeds_fit (jinsn, segP, fragP, fragP->fr_offset, total_text_diff))
|
|
|
++ {
|
|
|
++ struct trampoline_frag *tf = get_best_trampoline (jinsn, fragP);
|
|
|
++
|
|
|
++ if (tf)
|
|
|
++ {
|
|
|
++ this_text_diff += init_trampoline_frag (tf);
|
|
|
++ this_text_diff += add_jump_to_trampoline (tf, fragP);
|
|
|
++ }
|
|
|
++ else
|
|
|
++ {
|
|
|
++ /* If target symbol is undefined, assume it will reach once linked. */
|
|
|
++ expressionS *exp = &istack.insn[istack.ninsn - 2].tok[0];
|
|
|
++
|
|
|
++ if (exp->X_op == O_symbol && S_IS_DEFINED (exp->X_add_symbol))
|
|
|
++ {
|
|
|
++ as_bad_where (fragP->fr_file, fragP->fr_line,
|
|
|
++ _("jump target out of range; no usable trampoline found"));
|
|
|
++ }
|
|
|
++ }
|
|
|
++ }
|
|
|
++ }
|
|
|
++
|
|
|
+ return this_text_diff;
|
|
|
+ }
|
|
|
+
|
|
|
+@@ -9404,6 +9955,9 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT sec, fragS *fragp)
|
|
|
+ else
|
|
|
+ as_bad (_("invalid relaxation fragment result"));
|
|
|
+ break;
|
|
|
++
|
|
|
++ case RELAX_TRAMPOLINE:
|
|
|
++ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ fragp->fr_var = 0;
|
|
|
+diff --git a/gas/config/tc-xtensa.h b/gas/config/tc-xtensa.h
|
|
|
+index 0bf1240..4672bc6 100644
|
|
|
+--- a/gas/config/tc-xtensa.h
|
|
|
++++ b/gas/config/tc-xtensa.h
|
|
|
+@@ -180,6 +180,11 @@ enum xtensa_relax_statesE
|
|
|
+ prevent the linker from changing the size of any frag between the
|
|
|
+ section start and the org frag. */
|
|
|
+
|
|
|
++ RELAX_TRAMPOLINE,
|
|
|
++ /* Every few thousand frags, we insert one of these, just in case we may
|
|
|
++ need some space for a trampoline (jump to a jump) because the function
|
|
|
++ has gotten too big. If not needed, it disappears. */
|
|
|
++
|
|
|
+ RELAX_NONE
|
|
|
+ };
|
|
|
+
|
|
|
+diff --git a/gas/doc/as.texinfo b/gas/doc/as.texinfo
|
|
|
+index 5c8b000..dc97175 100644
|
|
|
+--- a/gas/doc/as.texinfo
|
|
|
++++ b/gas/doc/as.texinfo
|
|
|
+@@ -543,6 +543,7 @@ gcc(1), ld(1), and the Info entries for @file{binutils} and @file{ld}.
|
|
|
+ [@b{--[no-]target-align}] [@b{--[no-]longcalls}]
|
|
|
+ [@b{--[no-]transform}]
|
|
|
+ [@b{--rename-section} @var{oldname}=@var{newname}]
|
|
|
++ [@b{--[no-]trampolines}]
|
|
|
+ @end ifset
|
|
|
+
|
|
|
+ @ifset Z80
|
|
|
+diff --git a/gas/doc/c-xtensa.texi b/gas/doc/c-xtensa.texi
|
|
|
+index 406e635..e763e36 100644
|
|
|
+--- a/gas/doc/c-xtensa.texi
|
|
|
++++ b/gas/doc/c-xtensa.texi
|
|
|
+@@ -91,6 +91,16 @@ instruction operands to be errors.
|
|
|
+ @kindex --rename-section
|
|
|
+ Rename the @var{oldname} section to @var{newname}. This option can be used
|
|
|
+ multiple times to rename multiple sections.
|
|
|
++
|
|
|
++@item --trampolines | --no-trampolines
|
|
|
++@kindex --trampolines
|
|
|
++@kindex --no-trampolines
|
|
|
++Enable or disable transformation of jump instructions to allow jumps
|
|
|
++across a greater range of addresses. @xref{Xtensa Jump Relaxation,
|
|
|
++,Jump Trampolines}. This option should be used when jump targets can
|
|
|
++potentially be out of range. In the absence of such jumps this option
|
|
|
++does not affect code size or performance. The default is
|
|
|
++@samp{--trampolines}.
|
|
|
+ @end table
|
|
|
+
|
|
|
+ @c man end
|
|
|
+@@ -311,6 +321,7 @@ fields.
|
|
|
+ @menu
|
|
|
+ * Xtensa Branch Relaxation:: Relaxation of Branches.
|
|
|
+ * Xtensa Call Relaxation:: Relaxation of Function Calls.
|
|
|
++* Xtensa Jump Relaxation:: Relaxation of Jumps.
|
|
|
+ * Xtensa Immediate Relaxation:: Relaxation of other Immediate Fields.
|
|
|
+ @end menu
|
|
|
+
|
|
|
+@@ -398,6 +409,87 @@ and some of the calls are out of range, function call relaxation can be
|
|
|
+ enabled using the @samp{--longcalls} command-line option or the
|
|
|
+ @code{longcalls} directive (@pxref{Longcalls Directive, ,longcalls}).
|
|
|
+
|
|
|
++@node Xtensa Jump Relaxation
|
|
|
++@subsection Jump Relaxation
|
|
|
++@cindex relaxation of jump instructions
|
|
|
++@cindex jump instructions, relaxation
|
|
|
++
|
|
|
++Jump instruction may require relaxation because the Xtensa jump instruction
|
|
|
++(@code{J}) provide a PC-relative offset of only 128 Kbytes in either
|
|
|
++direction. One option is to use jump long (@code{J.L}) instruction, which
|
|
|
++depending on jump distance may be assembled as jump (@code{J}) or indirect
|
|
|
++jump (@code{JX}). However it needs a free register. When there's no spare
|
|
|
++register it is possible to plant intermediate jump sites (trampolines)
|
|
|
++between the jump instruction and its target. These sites may be located in
|
|
|
++areas unreachable by normal code execution flow, in that case they only
|
|
|
++contain intermediate jumps, or they may be inserted in the middle of code
|
|
|
++block, in which case there's an additional jump from the beginning of the
|
|
|
++trampoline to the instruction past its end. So, for example:
|
|
|
++
|
|
|
++@smallexample
|
|
|
++@group
|
|
|
++ j 1f
|
|
|
++ ...
|
|
|
++ retw
|
|
|
++ ...
|
|
|
++ mov a10, a2
|
|
|
++ call8 func
|
|
|
++ ...
|
|
|
++1:
|
|
|
++ ...
|
|
|
++@end group
|
|
|
++@end smallexample
|
|
|
++
|
|
|
++might be relaxed to:
|
|
|
++
|
|
|
++@smallexample
|
|
|
++@group
|
|
|
++ j .L0_TR_1
|
|
|
++ ...
|
|
|
++ retw
|
|
|
++.L0_TR_1:
|
|
|
++ j 1f
|
|
|
++ ...
|
|
|
++ mov a10, a2
|
|
|
++ call8 func
|
|
|
++ ...
|
|
|
++1:
|
|
|
++ ...
|
|
|
++@end group
|
|
|
++@end smallexample
|
|
|
++
|
|
|
++or to:
|
|
|
++
|
|
|
++@smallexample
|
|
|
++@group
|
|
|
++ j .L0_TR_1
|
|
|
++ ...
|
|
|
++ retw
|
|
|
++ ...
|
|
|
++ mov a10, a2
|
|
|
++ j .L0_TR_0
|
|
|
++.L0_TR_1:
|
|
|
++ j 1f
|
|
|
++.L0_TR_0:
|
|
|
++ call8 func
|
|
|
++ ...
|
|
|
++1:
|
|
|
++ ...
|
|
|
++@end group
|
|
|
++@end smallexample
|
|
|
++
|
|
|
++The Xtensa assempler uses trampolines with jump around only when it cannot
|
|
|
++find suitable unreachable trampoline. There may be multiple trampolines
|
|
|
++between the jump instruction and its target.
|
|
|
++
|
|
|
++This relaxation does not apply to jumps to undefined symbols, assuming they
|
|
|
++will reach their targets once resolved.
|
|
|
++
|
|
|
++Jump relaxation is enabled by default because it does not affect code size
|
|
|
++or performance while the code itself is small. This relaxation may be
|
|
|
++disabled completely with @samp{--no-trampolines} or @samp{--no-transform}
|
|
|
++command-line options (@pxref{Xtensa Options, ,Command Line Options}).
|
|
|
++
|
|
|
+ @node Xtensa Immediate Relaxation
|
|
|
+ @subsection Other Immediate Field Relaxation
|
|
|
+ @cindex immediate fields, relaxation
|
|
|
+diff --git a/gas/frags.c b/gas/frags.c
|
|
|
+index 5f68480..e14099d 100644
|
|
|
+--- a/gas/frags.c
|
|
|
++++ b/gas/frags.c
|
|
|
+@@ -24,6 +24,20 @@
|
|
|
+
|
|
|
+ extern fragS zero_address_frag;
|
|
|
+ extern fragS predefined_address_frag;
|
|
|
++
|
|
|
++static int totalfrags;
|
|
|
++
|
|
|
++int
|
|
|
++get_frag_count (void)
|
|
|
++{
|
|
|
++ return totalfrags;
|
|
|
++}
|
|
|
++
|
|
|
++void
|
|
|
++clear_frag_count (void)
|
|
|
++{
|
|
|
++ totalfrags = 0;
|
|
|
++}
|
|
|
+
|
|
|
+ /* Initialization for frag routines. */
|
|
|
+
|
|
|
+@@ -70,6 +84,7 @@ frag_alloc (struct obstack *ob)
|
|
|
+ ptr = (fragS *) obstack_alloc (ob, SIZEOF_STRUCT_FRAG);
|
|
|
+ obstack_alignment_mask (ob) = oalign;
|
|
|
+ memset (ptr, 0, SIZEOF_STRUCT_FRAG);
|
|
|
++ totalfrags++;
|
|
|
+ return ptr;
|
|
|
+ }
|
|
|
+
|
|
|
+diff --git a/gas/frags.h b/gas/frags.h
|
|
|
+index 319898f..2f9e1b5 100644
|
|
|
+--- a/gas/frags.h
|
|
|
++++ b/gas/frags.h
|
|
|
+@@ -155,4 +155,7 @@ char *frag_var (relax_stateT type,
|
|
|
+
|
|
|
+ bfd_boolean frag_offset_fixed_p (const fragS *, const fragS *, offsetT *);
|
|
|
+
|
|
|
++int get_frag_count (void);
|
|
|
++void clear_frag_count (void);
|
|
|
++
|
|
|
+ #endif /* FRAGS_H */
|
|
|
+diff --git a/gas/testsuite/gas/xtensa/all.exp b/gas/testsuite/gas/xtensa/all.exp
|
|
|
+index 2b2c294..3683b78 100644
|
|
|
+--- a/gas/testsuite/gas/xtensa/all.exp
|
|
|
++++ b/gas/testsuite/gas/xtensa/all.exp
|
|
|
+@@ -98,6 +98,7 @@ if [istarget xtensa*-*-*] then {
|
|
|
+ run_dump_test "pcrel"
|
|
|
+ run_dump_test "weak-call"
|
|
|
+ run_dump_test "jlong"
|
|
|
++ run_dump_test "trampoline"
|
|
|
+ }
|
|
|
+
|
|
|
+ if [info exists errorInfo] then {
|
|
|
+diff --git a/gas/testsuite/gas/xtensa/trampoline.d b/gas/testsuite/gas/xtensa/trampoline.d
|
|
|
+new file mode 100644
|
|
|
+index 0000000..b4f65dc
|
|
|
+--- /dev/null
|
|
|
++++ b/gas/testsuite/gas/xtensa/trampoline.d
|
|
|
+@@ -0,0 +1,26 @@
|
|
|
++#as:
|
|
|
++#objdump: -d
|
|
|
++#name: trampolines relaxation
|
|
|
++
|
|
|
++.*: +file format .*xtensa.*
|
|
|
++#...
|
|
|
++.*0:.*j.0x1194c
|
|
|
++.*3:.*j.0x1194f
|
|
|
++.*6:.*j.0x11952
|
|
|
++.*9:.*j.0x1d4e4
|
|
|
++#...
|
|
|
++.*11949:.*j.0x11955
|
|
|
++.*1194c:.*j.0x24a0e
|
|
|
++.*1194f:.*j.0x24a0e
|
|
|
++.*11952:.*j.0x24a11
|
|
|
++#...
|
|
|
++.*1d4e1:.*j.0x1d4e7
|
|
|
++.*1d4e4:.*j.0x33462
|
|
|
++#...
|
|
|
++.*24a0e:.*j.0x24a0e
|
|
|
++.*24a11:.*j.0x24a11
|
|
|
++#...
|
|
|
++.*3345f:.*ret
|
|
|
++.*33462:.*j.0x49407
|
|
|
++#...
|
|
|
++.*49407:.*j.0x49407
|
|
|
+diff --git a/gas/testsuite/gas/xtensa/trampoline.s b/gas/testsuite/gas/xtensa/trampoline.s
|
|
|
+new file mode 100644
|
|
|
+index 0000000..259a3bb
|
|
|
+--- /dev/null
|
|
|
++++ b/gas/testsuite/gas/xtensa/trampoline.s
|
|
|
+@@ -0,0 +1,21 @@
|
|
|
++ .text
|
|
|
++ j 1f
|
|
|
++ j 1f
|
|
|
++ j 2f
|
|
|
++ j 3f
|
|
|
++ .rep 25000
|
|
|
++99:
|
|
|
++ and a2, a2, a3
|
|
|
++ bne a2, a3, 99b
|
|
|
++ .endr
|
|
|
++1:
|
|
|
++ j 1b
|
|
|
++2:
|
|
|
++ j 2b
|
|
|
++
|
|
|
++ .rep 25000
|
|
|
++ and a2, a2, a3
|
|
|
++ _ret
|
|
|
++ .endr
|
|
|
++3:
|
|
|
++ j 3b
|
|
|
+--
|
|
|
+1.8.1.4
|
|
|
+
|
Max Filippov