From 011b32fd4270fb7111ee1f63695ccd44562ee7df Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Fri, 18 May 2018 06:43:19 -0700 Subject: [PATCH] x86: Don't set eh->local_ref to 1 for linker defined symbols Since symbols created by HIDDEN and PROVIDE_HIDDEN assignments in linker script may be marked as defined, but not hidden, we can't set eh->local_ref to 1 in _bfd_x86_elf_link_symbol_references_local. Also R_386_GOT32X should be handled as just like R_386_GOT32 when relocating a section. The input R_386_GOT32X relocations, which can be relaxed, should have been converted to R_386_PC32, R_386_32 or R_386_GOTOFF. bfd/ PR ld/23189 * elf32-i386.c (elf_i386_relocate_section): Handle R_386_GOT32X like R_386_GOT32. * elfxx-x86.c (_bfd_x86_elf_link_symbol_references_local): Don't set eh->local_ref to 1 for linker defined symbols. ld/ PR ld/23189 * testsuite/ld-i386/i386.exp: Run pr23189. * testsuite/ld-x86-64/x86-64.exp: Likewise. * testsuite/ld-i386/pr23189.d: New file. * testsuite/ld-i386/pr23189.s: Likewise. * testsuite/ld-i386/pr23189.t: Likewise. * testsuite/ld-x86-64/pr23189.d: Likewise. * testsuite/ld-x86-64/pr23189.s: Likewise. * testsuite/ld-x86-64/pr23189.t: Likewise. --- bfd/ChangeLog | 8 ++++++ bfd/elf32-i386.c | 59 --------------------------------------- bfd/elfxx-x86.c | 6 +++- ld/ChangeLog | 12 ++++++++ ld/testsuite/ld-i386/i386.exp | 1 + ld/testsuite/ld-i386/pr23189.d | 7 +++++ ld/testsuite/ld-i386/pr23189.s | 5 ++++ ld/testsuite/ld-i386/pr23189.t | 11 ++++++++ ld/testsuite/ld-x86-64/pr23189.d | 7 +++++ ld/testsuite/ld-x86-64/pr23189.s | 5 ++++ ld/testsuite/ld-x86-64/pr23189.t | 11 ++++++++ ld/testsuite/ld-x86-64/x86-64.exp | 1 + 12 files changed, 73 insertions(+), 60 deletions(-) create mode 100644 ld/testsuite/ld-i386/pr23189.d create mode 100644 ld/testsuite/ld-i386/pr23189.s create mode 100644 ld/testsuite/ld-i386/pr23189.t create mode 100644 ld/testsuite/ld-x86-64/pr23189.d create mode 100644 ld/testsuite/ld-x86-64/pr23189.s create mode 100644 ld/testsuite/ld-x86-64/pr23189.t diff --git a/bfd/ChangeLog b/bfd/ChangeLog index f0ea6f9..a9248e6 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,11 @@ +2018-05-18 H.J. Lu + + PR ld/23189 + * elf32-i386.c (elf_i386_relocate_section): Handle R_386_GOT32X + like R_386_GOT32. + * elfxx-x86.c (_bfd_x86_elf_link_symbol_references_local): Don't + set eh->local_ref to 1 for linker defined symbols. + 2018-05-18 Alan Modra PR 23199 diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c index 580a591..3dd709a 100644 --- a/bfd/elf32-i386.c +++ b/bfd/elf32-i386.c @@ -2451,66 +2451,7 @@ skip_ifunc: switch (r_type) { case R_386_GOT32X: - /* Avoid optimizing _DYNAMIC since ld.so may use its - link-time address. */ - if (h == htab->elf.hdynamic) - goto r_386_got32; - - if (bfd_link_pic (info)) - { - /* It is OK to convert mov to lea and convert indirect - branch to direct branch. It is OK to convert adc, - add, and, cmp, or, sbb, sub, test, xor only when PIC - is false. */ - unsigned int opcode, addend; - addend = bfd_get_32 (input_bfd, contents + rel->r_offset); - if (addend != 0) - goto r_386_got32; - opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); - if (opcode != 0x8b && opcode != 0xff) - goto r_386_got32; - } - - /* Resolve "mov GOT[(%reg)], %reg", - "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]" - and "binop foo@GOT[(%reg)], %reg". */ - if (h == NULL - || (h->plt.offset == (bfd_vma) -1 - && h->got.offset == (bfd_vma) -1) - || htab->elf.sgotplt == NULL) - abort (); - - offplt = (htab->elf.sgotplt->output_section->vma - + htab->elf.sgotplt->output_offset); - - /* It is relative to .got.plt section. */ - if (h->got.offset != (bfd_vma) -1) - /* Use GOT entry. Mask off the least significant bit in - GOT offset which may be set by R_386_GOT32 processing - below. */ - relocation = (htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset - + (h->got.offset & ~1) - offplt); - else - /* Use GOTPLT entry. */ - relocation = (h->plt.offset / plt_entry_size - - htab->plt.has_plt0 + 3) * 4; - - if (!bfd_link_pic (info)) - { - /* If not PIC, add the .got.plt section address for - baseless addressing. */ - unsigned int modrm; - modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); - if ((modrm & 0xc7) == 0x5) - relocation += offplt; - } - - unresolved_reloc = FALSE; - break; - case R_386_GOT32: -r_386_got32: /* Relocation is to the entry for this symbol in the global offset table. */ if (htab->elf.sgot == NULL) diff --git a/bfd/elfxx-x86.c b/bfd/elfxx-x86.c index 936b4c6..f4dbddf 100644 --- a/bfd/elfxx-x86.c +++ b/bfd/elfxx-x86.c @@ -2047,7 +2047,11 @@ _bfd_x86_elf_link_symbol_references_local (struct bfd_link_info *info, return TRUE; } - eh->local_ref = 1; + /* Symbols created by HIDDEN and PROVIDE_HIDDEN assignments in linker + script aren't forced local here yet. */ + if (!h->root.ldscript_def) + eh->local_ref = 1; + return FALSE; } diff --git a/ld/ChangeLog b/ld/ChangeLog index 78c0d26..5986f3c 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,15 @@ +2018-05-18 H.J. Lu + + PR ld/23189 + * testsuite/ld-i386/i386.exp: Run pr23189. + * testsuite/ld-x86-64/x86-64.exp: Likewise. + * testsuite/ld-i386/pr23189.d: New file. + * testsuite/ld-i386/pr23189.s: Likewise. + * testsuite/ld-i386/pr23189.t: Likewise. + * testsuite/ld-x86-64/pr23189.d: Likewise. + * testsuite/ld-x86-64/pr23189.s: Likewise. + * testsuite/ld-x86-64/pr23189.t: Likewise. + 2018-05-15 Alan Modra * testsuite/ld-elf/notes.exp: Restore LDFLAGS. diff --git a/ld/testsuite/ld-i386/i386.exp b/ld/testsuite/ld-i386/i386.exp index 0d50b63..7aec534 100644 --- a/ld/testsuite/ld-i386/i386.exp +++ b/ld/testsuite/ld-i386/i386.exp @@ -479,6 +479,7 @@ run_dump_test "pr18815" run_dump_test "pr19939a" run_dump_test "pr19939b" run_dump_test "tlsdesc2" +run_dump_test "pr23189" proc undefined_weak {cflags ldflags} { set testname "Undefined weak symbol" diff --git a/ld/testsuite/ld-i386/pr23189.d b/ld/testsuite/ld-i386/pr23189.d new file mode 100644 index 0000000..9345b42 --- /dev/null +++ b/ld/testsuite/ld-i386/pr23189.d @@ -0,0 +1,7 @@ +#as: --32 -mrelax-relocations=yes +#ld: -shared -melf_i386 -T pr23189.t +#readelf: -r --wide + +Relocation section '.rel.dyn' at offset 0x[0-9a-f]+ contains 1 entry: + Offset Info Type Sym. Value Symbol's Name +[0-9a-f]+ +[0-9a-f]+ +R_386_RELATIVE + diff --git a/ld/testsuite/ld-i386/pr23189.s b/ld/testsuite/ld-i386/pr23189.s new file mode 100644 index 0000000..4a6c9cd --- /dev/null +++ b/ld/testsuite/ld-i386/pr23189.s @@ -0,0 +1,5 @@ + .globl _start + .type _start, @function +_start: + movl __hidden_sym@GOT(%eax), %eax + .size _start, .-_start diff --git a/ld/testsuite/ld-i386/pr23189.t b/ld/testsuite/ld-i386/pr23189.t new file mode 100644 index 0000000..0e6ff65 --- /dev/null +++ b/ld/testsuite/ld-i386/pr23189.t @@ -0,0 +1,11 @@ +EXTERN(_start) +ENTRY(_start) + +SECTIONS +{ + .text : + { + HIDDEN (__hidden_sym = .); + *(.text*) + } +} diff --git a/ld/testsuite/ld-x86-64/pr23189.d b/ld/testsuite/ld-x86-64/pr23189.d new file mode 100644 index 0000000..7951c7a --- /dev/null +++ b/ld/testsuite/ld-x86-64/pr23189.d @@ -0,0 +1,7 @@ +#as: --64 -mrelax-relocations=yes +#ld: -shared -melf_x86_64 -T pr23189.t +#readelf: -r --wide + +Relocation section '.rela.dyn' at offset 0x[0-9a-f]+ contains 1 entry: + Offset Info Type Symbol's Value Symbol's Name \+ Addend +[0-9a-f]+ +[0-9a-f]+ +R_X86_64_RELATIVE +[0-9a-f]+ diff --git a/ld/testsuite/ld-x86-64/pr23189.s b/ld/testsuite/ld-x86-64/pr23189.s new file mode 100644 index 0000000..971ad8f --- /dev/null +++ b/ld/testsuite/ld-x86-64/pr23189.s @@ -0,0 +1,5 @@ + .globl _start + .type _start, @function +_start: + movq __hidden_sym@GOTPCREL(%rip), %rax + .size _start, .-_start diff --git a/ld/testsuite/ld-x86-64/pr23189.t b/ld/testsuite/ld-x86-64/pr23189.t new file mode 100644 index 0000000..0e6ff65 --- /dev/null +++ b/ld/testsuite/ld-x86-64/pr23189.t @@ -0,0 +1,11 @@ +EXTERN(_start) +ENTRY(_start) + +SECTIONS +{ + .text : + { + HIDDEN (__hidden_sym = .); + *(.text*) + } +} diff --git a/ld/testsuite/ld-x86-64/x86-64.exp b/ld/testsuite/ld-x86-64/x86-64.exp index 5a06947..563e782 100644 --- a/ld/testsuite/ld-x86-64/x86-64.exp +++ b/ld/testsuite/ld-x86-64/x86-64.exp @@ -606,6 +606,7 @@ run_dump_test "pr20253-5b" run_dump_test "tlsdesc2" run_dump_test "pr22048" run_dump_test "pr22929" +run_dump_test "pr23189" proc undefined_weak {cflags ldflags} { set testname "Undefined weak symbol" -- 2.7.4