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From 279b2f94168ee91e02ccd070d27c983fc001fe12 Mon Sep 17 00:00:00 2001
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From: Renlin Li <renlin.li@arm.com>
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Date: Sat, 3 Feb 2018 13:18:17 +0000
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Subject: [PATCH] [PR22764][LD][AARCH64]Allow R_AARCH64_ABS16 and
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R_AARCH64_ABS32 against absolution symbol or undefine symbol in shared
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object.
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The assumption that R_AARCH64_ABS16 and R_AARCH64_ABS32 relocation in LP64 abi
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will be used to generate an address does not hold for absolute symbol.
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In this case, it is a value fixed at static linking time.
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The condition to check the relocations is relax to allow absolute symbol and
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undefined symbol case.
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bfd/
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2018-02-05 Renlin Li <renlin.li@arm.com>
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PR ld/22764
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* elfnn-aarch64.c (elfNN_aarch64_check_relocs): Relax the
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R_AARCH64_ABS32 and R_AARCH64_ABS16 for absolute symbol. Apply the
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check for writeable section as well.
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ld/
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2018-02-05 Renlin Li <renlin.li@arm.com>
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PR ld/22764
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* testsuite/ld-aarch64/emit-relocs-258.s: Define symbol as an address.
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* testsuite/ld-aarch64/emit-relocs-259.s: Likewise.
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* testsuite/ld-aarch64/aarch64-elf.exp: Run new test.
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* testsuite/ld-aarch64/pr22764.s: New.
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* testsuite/ld-aarch64/pr22764.d: New.
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---
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bfd/ChangeLog | 7 +++++++
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bfd/elfnn-aarch64.c | 15 ++++++++++++---
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ld/ChangeLog | 8 ++++++++
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ld/testsuite/ld-aarch64/aarch64-elf.exp | 1 +
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ld/testsuite/ld-aarch64/emit-relocs-258.s | 3 ++-
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ld/testsuite/ld-aarch64/emit-relocs-259.s | 3 ++-
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ld/testsuite/ld-aarch64/pr22764.d | 18 ++++++++++++++++++
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ld/testsuite/ld-aarch64/pr22764.s | 6 ++++++
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8 files changed, 56 insertions(+), 5 deletions(-)
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create mode 100644 ld/testsuite/ld-aarch64/pr22764.d
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create mode 100644 ld/testsuite/ld-aarch64/pr22764.s
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diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c
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index af448f9..2737773 100644
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--- a/bfd/elfnn-aarch64.c
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+++ b/bfd/elfnn-aarch64.c
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@@ -7189,10 +7189,19 @@ elfNN_aarch64_check_relocs (bfd *abfd, struct bfd_link_info *info,
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#if ARCH_SIZE == 64
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case BFD_RELOC_AARCH64_32:
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#endif
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- if (bfd_link_pic (info)
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- && (sec->flags & SEC_ALLOC) != 0
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- && (sec->flags & SEC_READONLY) != 0)
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+ if (bfd_link_pic (info) && (sec->flags & SEC_ALLOC) != 0)
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{
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+ if (h != NULL
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+ /* This is an absolute symbol. It represents a value instead
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+ of an address. */
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+ && ((h->root.type == bfd_link_hash_defined
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+ && bfd_is_abs_section (h->root.u.def.section))
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+ /* This is an undefined symbol. */
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+ || h->root.type == bfd_link_hash_undefined))
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+ break;
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+
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+ /* For local symbols, defined global symbols in a non-ABS section,
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+ it is assumed that the value is an address. */
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int howto_index = bfd_r_type - BFD_RELOC_AARCH64_RELOC_START;
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_bfd_error_handler
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/* xgettext:c-format */
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diff --git a/ld/testsuite/ld-aarch64/aarch64-elf.exp b/ld/testsuite/ld-aarch64/aarch64-elf.exp
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index 2602a43..c67ffb1 100644
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--- a/ld/testsuite/ld-aarch64/aarch64-elf.exp
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+++ b/ld/testsuite/ld-aarch64/aarch64-elf.exp
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@@ -285,6 +285,7 @@ run_dump_test "pr17415"
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run_dump_test_lp64 "tprel_g2_overflow"
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run_dump_test "tprel_add_lo12_overflow"
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run_dump_test "protected-data"
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+run_dump_test_lp64 "pr22764"
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# ifunc tests
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run_dump_test "ifunc-1"
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diff --git a/ld/testsuite/ld-aarch64/emit-relocs-258.s b/ld/testsuite/ld-aarch64/emit-relocs-258.s
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index f724776..87bb657 100644
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--- a/ld/testsuite/ld-aarch64/emit-relocs-258.s
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+++ b/ld/testsuite/ld-aarch64/emit-relocs-258.s
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@@ -1,5 +1,6 @@
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+.global dummy
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.text
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-
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+dummy:
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ldr x0, .L1
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.L1:
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diff --git a/ld/testsuite/ld-aarch64/emit-relocs-259.s b/ld/testsuite/ld-aarch64/emit-relocs-259.s
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index 7e1ba3c..0977c9d 100644
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--- a/ld/testsuite/ld-aarch64/emit-relocs-259.s
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+++ b/ld/testsuite/ld-aarch64/emit-relocs-259.s
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@@ -1,5 +1,6 @@
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+.global dummy
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.text
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-
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+dummy:
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ldr x0, .L1
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.L1:
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diff --git a/ld/testsuite/ld-aarch64/pr22764.d b/ld/testsuite/ld-aarch64/pr22764.d
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new file mode 100644
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index 0000000..997519f
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--- /dev/null
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+++ b/ld/testsuite/ld-aarch64/pr22764.d
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@@ -0,0 +1,18 @@
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+#source: pr22764.s
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+#ld: -shared -T relocs.ld -defsym sym_abs1=0x1 -defsym sym_abs2=0x2 -defsym sym_abs3=0x3 -e0 --emit-relocs
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+#notarget: aarch64_be-*-*
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+#objdump: -dr
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+#...
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+
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+Disassembly of section \.text:
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+
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+0000000000010000 \<\.text\>:
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+ 10000: d503201f nop
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+ ...
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+ 10004: R_AARCH64_ABS64 sym_abs1
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+ 1000c: 00000002 \.word 0x00000002
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+ 1000c: R_AARCH64_ABS32 sym_abs2
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+ 10010: 0003 \.short 0x0003
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+ 10010: R_AARCH64_ABS16 sym_abs3
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+ 10012: 0000 \.short 0x0000
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+ 10014: d503201f nop
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diff --git a/ld/testsuite/ld-aarch64/pr22764.s b/ld/testsuite/ld-aarch64/pr22764.s
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new file mode 100644
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index 0000000..25e36b4
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--- /dev/null
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+++ b/ld/testsuite/ld-aarch64/pr22764.s
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@@ -0,0 +1,6 @@
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+ .text
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+ nop
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+ .xword sym_abs1
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+ .word sym_abs2
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+ .short sym_abs3
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+ nop
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--
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2.9.3
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