From 6798f8bfa617c72240036571cb12313fef353090 Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Mon, 19 Feb 2018 18:38:41 +0000 Subject: [PATCH] MIPS/BFD: Fix the size of `.reginfo' and `.MIPS.abiflags' sections Use the SEC_FIXED_SIZE flag to actually fix the size of `.reginfo' and `.MIPS.abiflags' sections in `_bfd_mips_elf_always_size_sections', as originally intended, removing link failures such as: ld: final link failed: Section has no contents or: ld: final link failed: Bad value or: ld: foo: .reginfo section size should be 24 bytes, actual size is 32 and assertion failures like: ld: BFD (GNU Binutils) 2.30.51.20180131 assertion fail .../bfd/elfxx-mips.c:14322 in link scenarios involving a linker script that either creates an output `.reginfo' or `.MIPS.abiflags' section from scratch or produces either section from different sections. If such an output section's size turns out to be incorrect according to the psABI, then the section is either truncated or padded out to the correct size, as relevant. This allows people to handle these sections in a link in an unusual way, while still addressing the issue covered by commit 58807c48a5a3 ("_bfd_mips_elf_final_link: Notify user about wrong .reginfo size"). The original arrangement, coming from an unindentified change made to what was called `mips_elf_always_size_sections' back then, between commit 02650bd0a97e ("This adds ABI flags to MIPS/ELF object files.") and commit 252b5132c753 ("19990502 sourceware import"), also missing from BFD ChangeLog files, assumed that the output section size is not going to change after return from `bfd_elf_size_dynamic_sections', the caller of that function, called in turn from `ldemul_before_allocation' via `gld${EMULATION_NAME}_before_allocation' in ld/emultempl/elf32.em, and ultimately from `lang_process'. This is because later on in `lang_process' processing `lang_size_sections' is called , happily recalculating the section size, and it has actually already been the case at the time of commit 252b5132c753 ("19990502 sourceware import"), so the assumption was clearly incorrect right from the beginning. bfd/ * elfxx-mips.c (_bfd_mips_elf_always_size_sections): Set SEC_FIXED_SIZE and SEC_HAS_CONTENTS flags for `.reginfo' and `.MIPS.abiflags' sections. (_bfd_mips_elf_final_link): Avoid reading beyond `.reginfo' section's end. ld/ * testsuite/ld-mips-elf/reginfo-0.d: New test. * testsuite/ld-mips-elf/reginfo-0r.d: New test. * testsuite/ld-mips-elf/reginfo-1.d: New test. * testsuite/ld-mips-elf/reginfo-1r.d: New test. * testsuite/ld-mips-elf/reginfo-2.d: New test. * testsuite/ld-mips-elf/reginfo-2r.d: New test. * testsuite/ld-mips-elf/mips-abiflags-0.d: New test. * testsuite/ld-mips-elf/mips-abiflags-0r.d: New test. * testsuite/ld-mips-elf/mips-abiflags-1.d: New test. * testsuite/ld-mips-elf/mips-abiflags-1r.d: New test. * testsuite/ld-mips-elf/mips-abiflags-2.d: New test. * testsuite/ld-mips-elf/mips-abiflags-2r.d: New test. * testsuite/ld-mips-elf/reginfo-0.ld: New test linker script. * testsuite/ld-mips-elf/reginfo-1.ld: New test linker script. * testsuite/ld-mips-elf/mips-abiflags-0.ld: New test linker script. * testsuite/ld-mips-elf/mips-abiflags-1.ld: New test linker script. * testsuite/ld-mips-elf/reginfo-1.s: New test source. * testsuite/ld-mips-elf/reginfo-2.s: New test source. * testsuite/ld-mips-elf/mips-elf.exp: Run the new tests. --- bfd/ChangeLog | 8 +++++++ bfd/elfxx-mips.c | 17 ++++++++++++--- ld/ChangeLog | 24 +++++++++++++++++++++ ld/testsuite/ld-mips-elf/mips-abiflags-0.d | 9 ++++++++ ld/testsuite/ld-mips-elf/mips-abiflags-0.ld | 5 +++++ ld/testsuite/ld-mips-elf/mips-abiflags-0r.d | 6 ++++++ ld/testsuite/ld-mips-elf/mips-abiflags-1.d | 6 ++++++ ld/testsuite/ld-mips-elf/mips-abiflags-1.ld | 5 +++++ ld/testsuite/ld-mips-elf/mips-abiflags-1r.d | 6 ++++++ ld/testsuite/ld-mips-elf/mips-abiflags-2.d | 6 ++++++ ld/testsuite/ld-mips-elf/mips-abiflags-2r.d | 6 ++++++ ld/testsuite/ld-mips-elf/mips-elf.exp | 17 +++++++++++++++ ld/testsuite/ld-mips-elf/reginfo-0.d | 9 ++++++++ ld/testsuite/ld-mips-elf/reginfo-0.ld | 5 +++++ ld/testsuite/ld-mips-elf/reginfo-0r.d | 9 ++++++++ ld/testsuite/ld-mips-elf/reginfo-1.d | 9 ++++++++ ld/testsuite/ld-mips-elf/reginfo-1.ld | 5 +++++ ld/testsuite/ld-mips-elf/reginfo-1.s | 10 +++++++++ ld/testsuite/ld-mips-elf/reginfo-1r.d | 9 ++++++++ ld/testsuite/ld-mips-elf/reginfo-2.d | 9 ++++++++ ld/testsuite/ld-mips-elf/reginfo-2.s | 10 +++++++++ ld/testsuite/ld-mips-elf/reginfo-2r.d | 9 ++++++++ 22 files changed, 196 insertions(+), 3 deletions(-) create mode 100644 ld/testsuite/ld-mips-elf/mips-abiflags-0.d create mode 100644 ld/testsuite/ld-mips-elf/mips-abiflags-0.ld create mode 100644 ld/testsuite/ld-mips-elf/mips-abiflags-0r.d create mode 100644 ld/testsuite/ld-mips-elf/mips-abiflags-1.d create mode 100644 ld/testsuite/ld-mips-elf/mips-abiflags-1.ld create mode 100644 ld/testsuite/ld-mips-elf/mips-abiflags-1r.d create mode 100644 ld/testsuite/ld-mips-elf/mips-abiflags-2.d create mode 100644 ld/testsuite/ld-mips-elf/mips-abiflags-2r.d create mode 100644 ld/testsuite/ld-mips-elf/reginfo-0.d create mode 100644 ld/testsuite/ld-mips-elf/reginfo-0.ld create mode 100644 ld/testsuite/ld-mips-elf/reginfo-0r.d create mode 100644 ld/testsuite/ld-mips-elf/reginfo-1.d create mode 100644 ld/testsuite/ld-mips-elf/reginfo-1.ld create mode 100644 ld/testsuite/ld-mips-elf/reginfo-1.s create mode 100644 ld/testsuite/ld-mips-elf/reginfo-1r.d create mode 100644 ld/testsuite/ld-mips-elf/reginfo-2.d create mode 100644 ld/testsuite/ld-mips-elf/reginfo-2.s create mode 100644 ld/testsuite/ld-mips-elf/reginfo-2r.d diff --git a/bfd/ChangeLog b/bfd/ChangeLog index b84a3d15972..6820732cc69 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,11 @@ +2018-02-19 Maciej W. Rozycki + + * elfxx-mips.c (_bfd_mips_elf_always_size_sections): Set + SEC_FIXED_SIZE and SEC_HAS_CONTENTS flags for `.reginfo' and + `.MIPS.abiflags' sections. + (_bfd_mips_elf_final_link): Avoid reading beyond `.reginfo' + section's end. + 2018-02-19 Maciej W. Rozycki * section.c (SEC_FIXED_SIZE): New macro. diff --git a/bfd/elfxx-mips.c b/bfd/elfxx-mips.c index 211f6f9c7e8..1b24f66797a 100644 --- a/bfd/elfxx-mips.c +++ b/bfd/elfxx-mips.c @@ -9294,12 +9294,19 @@ _bfd_mips_elf_always_size_sections (bfd *output_bfd, /* The .reginfo section has a fixed size. */ sect = bfd_get_section_by_name (output_bfd, ".reginfo"); if (sect != NULL) - bfd_set_section_size (output_bfd, sect, sizeof (Elf32_External_RegInfo)); + { + bfd_set_section_size (output_bfd, sect, sizeof (Elf32_External_RegInfo)); + sect->flags |= SEC_FIXED_SIZE | SEC_HAS_CONTENTS; + } /* The .MIPS.abiflags section has a fixed size. */ sect = bfd_get_section_by_name (output_bfd, ".MIPS.abiflags"); if (sect != NULL) - bfd_set_section_size (output_bfd, sect, sizeof (Elf_External_ABIFlags_v0)); + { + bfd_set_section_size (output_bfd, sect, + sizeof (Elf_External_ABIFlags_v0)); + sect->flags |= SEC_FIXED_SIZE | SEC_HAS_CONTENTS; + } hti.info = info; hti.output_bfd = output_bfd; @@ -14368,6 +14375,7 @@ _bfd_mips_elf_final_link (bfd *abfd, struct bfd_link_info *info) bfd *input_bfd; Elf32_External_RegInfo ext; Elf32_RegInfo sub; + bfd_size_type sz; if (p->type != bfd_indirect_link_order) { @@ -14379,8 +14387,11 @@ _bfd_mips_elf_final_link (bfd *abfd, struct bfd_link_info *info) input_section = p->u.indirect.section; input_bfd = input_section->owner; + sz = (input_section->size < sizeof (ext) + ? input_section->size : sizeof (ext)); + memset (&ext, 0, sizeof (ext)); if (! bfd_get_section_contents (input_bfd, input_section, - &ext, 0, sizeof ext)) + &ext, 0, sz)) return FALSE; bfd_mips_elf32_swap_reginfo_in (input_bfd, &ext, &sub); diff --git a/ld/ChangeLog b/ld/ChangeLog index 4f5cd5fe001..f2cc005391d 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,27 @@ +2018-02-19 Maciej W. Rozycki + + * testsuite/ld-mips-elf/reginfo-0.d: New test. + * testsuite/ld-mips-elf/reginfo-0r.d: New test. + * testsuite/ld-mips-elf/reginfo-1.d: New test. + * testsuite/ld-mips-elf/reginfo-1r.d: New test. + * testsuite/ld-mips-elf/reginfo-2.d: New test. + * testsuite/ld-mips-elf/reginfo-2r.d: New test. + * testsuite/ld-mips-elf/mips-abiflags-0.d: New test. + * testsuite/ld-mips-elf/mips-abiflags-0r.d: New test. + * testsuite/ld-mips-elf/mips-abiflags-1.d: New test. + * testsuite/ld-mips-elf/mips-abiflags-1r.d: New test. + * testsuite/ld-mips-elf/mips-abiflags-2.d: New test. + * testsuite/ld-mips-elf/mips-abiflags-2r.d: New test. + * testsuite/ld-mips-elf/reginfo-0.ld: New test linker script. + * testsuite/ld-mips-elf/reginfo-1.ld: New test linker script. + * testsuite/ld-mips-elf/mips-abiflags-0.ld: New test linker + script. + * testsuite/ld-mips-elf/mips-abiflags-1.ld: New test linker + script. + * testsuite/ld-mips-elf/reginfo-1.s: New test source. + * testsuite/ld-mips-elf/reginfo-2.s: New test source. + * testsuite/ld-mips-elf/mips-elf.exp: Run the new tests. + 2018-02-19 Maciej W. Rozycki * ldlang.c (insert_pad): Do not change output section's size if diff --git a/ld/testsuite/ld-mips-elf/mips-abiflags-0.d b/ld/testsuite/ld-mips-elf/mips-abiflags-0.d new file mode 100644 index 00000000000..8d243f42dd9 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/mips-abiflags-0.d @@ -0,0 +1,9 @@ +#readelf: -x .MIPS.abiflags +#name: MIPS .MIPS.abiflags section size 0 +#source: empty.s RUN_OBJCOPY +#objcopy_objects: -R .MIPS.abiflags +#ld: -T mips-abiflags-0.ld + +Hex dump of section '\.MIPS\.abiflags': + 0x00000000 ........ ........ ........ ........ .* + 0x00000010 ........ ........ .* diff --git a/ld/testsuite/ld-mips-elf/mips-abiflags-0.ld b/ld/testsuite/ld-mips-elf/mips-abiflags-0.ld new file mode 100644 index 00000000000..419756ebd27 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/mips-abiflags-0.ld @@ -0,0 +1,5 @@ +SECTIONS +{ + .MIPS.abiflags : { foo = .; } + /DISCARD/ : { *(*) } +} diff --git a/ld/testsuite/ld-mips-elf/mips-abiflags-0r.d b/ld/testsuite/ld-mips-elf/mips-abiflags-0r.d new file mode 100644 index 00000000000..0118e0778e6 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/mips-abiflags-0r.d @@ -0,0 +1,6 @@ +#readelf: -x .MIPS.abiflags +#name: MIPS .MIPS.abiflags section size 0 (relocatable) +#source: empty.s RUN_OBJCOPY +#objcopy_objects: -R .MIPS.abiflags +#ld: -r -T mips-abiflags-0.ld +#dump: mips-abiflags-0.d diff --git a/ld/testsuite/ld-mips-elf/mips-abiflags-1.d b/ld/testsuite/ld-mips-elf/mips-abiflags-1.d new file mode 100644 index 00000000000..d28b3da73e3 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/mips-abiflags-1.d @@ -0,0 +1,6 @@ +#readelf: -x .MIPS.abiflags +#name: MIPS .MIPS.abiflags section size 1 +#source: reginfo-1.s RUN_OBJCOPY +#objcopy_objects: -R .MIPS.abiflags +#ld: -T mips-abiflags-1.ld +#dump: mips-abiflags-0.d diff --git a/ld/testsuite/ld-mips-elf/mips-abiflags-1.ld b/ld/testsuite/ld-mips-elf/mips-abiflags-1.ld new file mode 100644 index 00000000000..7287a1e8804 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/mips-abiflags-1.ld @@ -0,0 +1,5 @@ +SECTIONS +{ + .MIPS.abiflags : { *(.foo) } + /DISCARD/ : { *(*) } +} diff --git a/ld/testsuite/ld-mips-elf/mips-abiflags-1r.d b/ld/testsuite/ld-mips-elf/mips-abiflags-1r.d new file mode 100644 index 00000000000..821a5b23773 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/mips-abiflags-1r.d @@ -0,0 +1,6 @@ +#readelf: -x .MIPS.abiflags +#name: MIPS .MIPS.abiflags section size 1 (relocatable) +#source: reginfo-1.s RUN_OBJCOPY +#objcopy_objects: -R .MIPS.abiflags +#ld: -r -T mips-abiflags-1.ld +#dump: mips-abiflags-0.d diff --git a/ld/testsuite/ld-mips-elf/mips-abiflags-2.d b/ld/testsuite/ld-mips-elf/mips-abiflags-2.d new file mode 100644 index 00000000000..796a8c2141b --- /dev/null +++ b/ld/testsuite/ld-mips-elf/mips-abiflags-2.d @@ -0,0 +1,6 @@ +#readelf: -x .MIPS.abiflags +#name: MIPS .MIPS.abiflags section size 2 +#source: reginfo-2.s RUN_OBJCOPY +#objcopy_objects: -R .MIPS.abiflags +#ld: -T mips-abiflags-1.ld +#dump: mips-abiflags-0.d diff --git a/ld/testsuite/ld-mips-elf/mips-abiflags-2r.d b/ld/testsuite/ld-mips-elf/mips-abiflags-2r.d new file mode 100644 index 00000000000..596e0eba71f --- /dev/null +++ b/ld/testsuite/ld-mips-elf/mips-abiflags-2r.d @@ -0,0 +1,6 @@ +#readelf: -x .MIPS.abiflags +#name: MIPS .MIPS.abiflags section size 2 (relocatable) +#source: reginfo-2.s RUN_OBJCOPY +#objcopy_objects: -R .MIPS.abiflags +#ld: -r -T mips-abiflags-1.ld +#dump: mips-abiflags-0.d diff --git a/ld/testsuite/ld-mips-elf/mips-elf.exp b/ld/testsuite/ld-mips-elf/mips-elf.exp index 13dbbc64f97..144b007089d 100644 --- a/ld/testsuite/ld-mips-elf/mips-elf.exp +++ b/ld/testsuite/ld-mips-elf/mips-elf.exp @@ -57,6 +57,7 @@ set has_newabi [expr [istarget *-*-irix6*] \ || [istarget mips*-sde-elf*] \ || [istarget mips*-mti-elf*] \ || [istarget mips*-img-elf*]] +set has_elf32 [expr ![istarget *-*-openbsd*]] set linux_gnu [expr [istarget mips*-*-linux*]] set embedded_elf [expr [istarget mips*-*-elf]] @@ -1237,3 +1238,19 @@ rename mips_old_prune_warnings prune_warnings # Verify that we can link ELF input into the `binary' output format. run_dump_test "binary" + +# Verify special section processing. +if $has_elf32 { + run_dump_test "reginfo-0" + run_dump_test "reginfo-0r" + run_dump_test "reginfo-1" + run_dump_test "reginfo-1r" + run_dump_test "reginfo-2" + run_dump_test "reginfo-2r" +} +run_dump_test "mips-abiflags-0" +run_dump_test "mips-abiflags-0r" +run_dump_test "mips-abiflags-1" +run_dump_test "mips-abiflags-1r" +run_dump_test "mips-abiflags-2" +run_dump_test "mips-abiflags-2r" diff --git a/ld/testsuite/ld-mips-elf/reginfo-0.d b/ld/testsuite/ld-mips-elf/reginfo-0.d new file mode 100644 index 00000000000..ee731ebc92c --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-0.d @@ -0,0 +1,9 @@ +#readelf: -x .reginfo +#name: MIPS .reginfo section size 0 +#source: empty.s RUN_OBJCOPY +#objcopy_objects: -R .reginfo +#ld: -T reginfo-0.ld + +Hex dump of section '\.reginfo': + 0x00000000 00000000 00000000 00000000 00000000 .* + 0x00000010 00000000 00000000 .* diff --git a/ld/testsuite/ld-mips-elf/reginfo-0.ld b/ld/testsuite/ld-mips-elf/reginfo-0.ld new file mode 100644 index 00000000000..d37eb0a1711 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-0.ld @@ -0,0 +1,5 @@ +SECTIONS +{ + .reginfo : { foo = .; } + /DISCARD/ : { *(*) } +} diff --git a/ld/testsuite/ld-mips-elf/reginfo-0r.d b/ld/testsuite/ld-mips-elf/reginfo-0r.d new file mode 100644 index 00000000000..f37ff80966d --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-0r.d @@ -0,0 +1,9 @@ +#readelf: -x .reginfo +#name: MIPS .reginfo section size 0 (relocatable) +#source: empty.s RUN_OBJCOPY +#objcopy_objects: -R .reginfo +#ld: -r -T reginfo-0.ld + +Hex dump of section '\.reginfo': + 0x00000000 00000000 00000000 00000000 00000000 .* + 0x00000010 00000000 ........ .* diff --git a/ld/testsuite/ld-mips-elf/reginfo-1.d b/ld/testsuite/ld-mips-elf/reginfo-1.d new file mode 100644 index 00000000000..dc98549ee9f --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-1.d @@ -0,0 +1,9 @@ +#readelf: -x .reginfo +#name: MIPS .reginfo section size 1 +#source: reginfo-1.s RUN_OBJCOPY +#objcopy_objects: -R .reginfo +#ld: -T reginfo-1.ld + +Hex dump of section '\.reginfo': + 0x00000000 01020304 05060708 090a0b0c 0d0e0f10 .* + 0x00000010 00000000 00000000 .* diff --git a/ld/testsuite/ld-mips-elf/reginfo-1.ld b/ld/testsuite/ld-mips-elf/reginfo-1.ld new file mode 100644 index 00000000000..151d19a0c82 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-1.ld @@ -0,0 +1,5 @@ +SECTIONS +{ + .reginfo : { *(.foo) } + /DISCARD/ : { *(*) } +} diff --git a/ld/testsuite/ld-mips-elf/reginfo-1.s b/ld/testsuite/ld-mips-elf/reginfo-1.s new file mode 100644 index 00000000000..2aad27216aa --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-1.s @@ -0,0 +1,10 @@ + .section .foo, "aw", @progbits + .globl foo + .type foo, @object +foo: + .set .Li, 0 + .rept 16 + .set .Li, .Li + 1 + .byte .Li + .endr + .size foo, . - foo diff --git a/ld/testsuite/ld-mips-elf/reginfo-1r.d b/ld/testsuite/ld-mips-elf/reginfo-1r.d new file mode 100644 index 00000000000..ca262fdc741 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-1r.d @@ -0,0 +1,9 @@ +#readelf: -x .reginfo +#name: MIPS .reginfo section size 1 (relocatable) +#source: reginfo-1.s RUN_OBJCOPY +#objcopy_objects: -R .reginfo +#ld: -r -T reginfo-1.ld + +Hex dump of section '\.reginfo': + 0x00000000 01020304 05060708 090a0b0c 0d0e0f10 .* + 0x00000010 00000000 ........ .* diff --git a/ld/testsuite/ld-mips-elf/reginfo-2.d b/ld/testsuite/ld-mips-elf/reginfo-2.d new file mode 100644 index 00000000000..11b73603c25 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-2.d @@ -0,0 +1,9 @@ +#readelf: -x .reginfo +#name: MIPS .reginfo section size 2 +#source: reginfo-2.s RUN_OBJCOPY +#objcopy_objects: -R .reginfo +#ld: -T reginfo-1.ld + +Hex dump of section '\.reginfo': + 0x00000000 01020304 05060708 090a0b0c 0d0e0f10 .* + 0x00000010 11121314 00000000 .* diff --git a/ld/testsuite/ld-mips-elf/reginfo-2.s b/ld/testsuite/ld-mips-elf/reginfo-2.s new file mode 100644 index 00000000000..fdc6e6ad7a1 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-2.s @@ -0,0 +1,10 @@ + .section .foo, "aw", @progbits + .globl foo + .type foo, @object +foo: + .set .Li, 0 + .rept 32 + .set .Li, .Li + 1 + .byte .Li + .endr + .size foo, . - foo diff --git a/ld/testsuite/ld-mips-elf/reginfo-2r.d b/ld/testsuite/ld-mips-elf/reginfo-2r.d new file mode 100644 index 00000000000..f1333378729 --- /dev/null +++ b/ld/testsuite/ld-mips-elf/reginfo-2r.d @@ -0,0 +1,9 @@ +#readelf: -x .reginfo +#name: MIPS .reginfo section size 2 (relocatable) +#source: reginfo-2.s RUN_OBJCOPY +#objcopy_objects: -R .reginfo +#ld: -r -T reginfo-1.ld + +Hex dump of section '\.reginfo': + 0x00000000 01020304 05060708 090a0b0c 0d0e0f10 .* + 0x00000010 11121314 ........ .* -- 2.30.2