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127 lines
4.2 KiB
Diff
127 lines
4.2 KiB
Diff
From 6a17eba5358549d0d6d195bb22b34cdbc068def2 Mon Sep 17 00:00:00 2001
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From: Volodymyr Arbatov <arbatov@cadence.com>
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Date: Mon, 6 May 2013 09:43:21 -0800
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Subject: [PATCH] Use signed data type for R_XTENSA_DIFF* relocation offsets.
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R_XTENSA_DIFF relocation offsets are in fact signed. Treat them as such.
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Add testcase that examines ld behaviour on R_XTENSA_DIFF relocation
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changing sign during relaxation.
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2014-05-02 Volodymyr Arbatov <arbatov@cadence.com>
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David Weatherford <weath@cadence.com>
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Max Filippov <jcmvbkbc@gmail.com>
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bfd/
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* elf32-xtensa.c (relax_section): treat R_XTENSA_DIFF* relocations as
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signed.
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gas/
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* config/tc-xtensa.c (md_apply_fix): mark BFD_RELOC_XTENSA_DIFF*
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fixups as signed.
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---
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Backported from: 1058c7532d0b012ac329219264ddad59049fb6e6
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Changes to Changelog files and tests are dropped.
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bfd/elf32-xtensa.c | 32 +++++++++++++++++---------------
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gas/config/tc-xtensa.c | 3 +++
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2 files changed, 20 insertions(+), 15 deletions(-)
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--- a/bfd/elf32-xtensa.c
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+++ b/bfd/elf32-xtensa.c
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@@ -223,11 +223,11 @@
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FALSE, 0, 0, FALSE),
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/* Relocations for supporting difference of symbols. */
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- HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
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+ HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_signed,
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bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8", FALSE, 0, 0xff, FALSE),
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- HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
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+ HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_signed,
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bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16", FALSE, 0, 0xffff, FALSE),
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- HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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+ HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
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bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32", FALSE, 0, 0xffffffff, FALSE),
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/* General immediate operand relocations. */
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@@ -9016,7 +9016,8 @@
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|| r_type == R_XTENSA_DIFF16
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|| r_type == R_XTENSA_DIFF32)
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{
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- bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
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+ bfd_signed_vma diff_value = 0;
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+ bfd_vma new_end_offset, diff_mask = 0;
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if (bfd_get_section_limit (abfd, sec) < old_source_offset)
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{
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@@ -9030,15 +9031,15 @@
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{
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case R_XTENSA_DIFF8:
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diff_value =
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- bfd_get_8 (abfd, &contents[old_source_offset]);
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+ bfd_get_signed_8 (abfd, &contents[old_source_offset]);
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break;
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case R_XTENSA_DIFF16:
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diff_value =
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- bfd_get_16 (abfd, &contents[old_source_offset]);
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+ bfd_get_signed_16 (abfd, &contents[old_source_offset]);
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break;
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case R_XTENSA_DIFF32:
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diff_value =
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- bfd_get_32 (abfd, &contents[old_source_offset]);
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+ bfd_get_signed_32 (abfd, &contents[old_source_offset]);
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break;
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}
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@@ -9050,24 +9051,25 @@
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switch (r_type)
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{
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case R_XTENSA_DIFF8:
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- diff_mask = 0xff;
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- bfd_put_8 (abfd, diff_value,
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+ diff_mask = 0x7f;
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+ bfd_put_signed_8 (abfd, diff_value,
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&contents[old_source_offset]);
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break;
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case R_XTENSA_DIFF16:
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- diff_mask = 0xffff;
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- bfd_put_16 (abfd, diff_value,
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+ diff_mask = 0x7fff;
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+ bfd_put_signed_16 (abfd, diff_value,
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&contents[old_source_offset]);
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break;
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case R_XTENSA_DIFF32:
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- diff_mask = 0xffffffff;
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- bfd_put_32 (abfd, diff_value,
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+ diff_mask = 0x7fffffff;
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+ bfd_put_signed_32 (abfd, diff_value,
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&contents[old_source_offset]);
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break;
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}
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- /* Check for overflow. */
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- if ((diff_value & ~diff_mask) != 0)
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+ /* Check for overflow. Sign bits must be all zeroes or all ones */
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+ if ((diff_value & ~diff_mask) != 0 &&
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+ (diff_value & ~diff_mask) != (-1 & ~diff_mask))
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{
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(*link_info->callbacks->reloc_dangerous)
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(link_info, _("overflow after relaxation"),
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--- a/gas/config/tc-xtensa.c
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+++ b/gas/config/tc-xtensa.c
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@@ -5868,12 +5868,15 @@
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{
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case BFD_RELOC_8:
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fixP->fx_r_type = BFD_RELOC_XTENSA_DIFF8;
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+ fixP->fx_signed = 1;
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break;
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case BFD_RELOC_16:
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fixP->fx_r_type = BFD_RELOC_XTENSA_DIFF16;
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+ fixP->fx_signed = 1;
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break;
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case BFD_RELOC_32:
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fixP->fx_r_type = BFD_RELOC_XTENSA_DIFF32;
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+ fixP->fx_signed = 1;
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break;
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default:
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break;
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