0a59decbb8
Linkers group input note sections with the same name into one output note section with the same name. One output note section is placed in one PT_NOTE segment. New linkers merge all input .note.gnu.property sections into one output .note.gnu.property section with a single NT_GNU_PROPERTY_TYPE_0 note in a single PT_NOTE segment. Since older linkers treat input .note.gnu.property section as a generic note section and just concatenate all input .note.gnu.property sections into one output .note.gnu.property section without merging them, we may see one or more NT_GNU_PROPERTY_TYPE_0 notes in PT_NOTE segment, which are invalid. GNU_PROPERTY_X86_UINT32_VALID was defined to address this issue such that linker sets the bit for non-relocatable outputs. But it isn't sufficient: 1. It doesn't cover generic properties. 2. When -mx86-used-note=yes is passed to x86 assembler, the GNU_PROPERTY_X86_UINT32_VALID bit is set in GNU_PROPERTY_X86_ISA_1_USED property in object file and older linkers generate invalid NT_GNU_PROPERTY_TYPE_0 notes with the GNU_PROPERTY_X86_UINT32_VALID bit set. I am proposing the following changes: 1. Add PT_GNU_PROPERTY segment type: # define PT_GNU_PROPERTY (PT_LOOS + 0x474e553) which covers .note.gnu.property section. 2. Remove GNU_PROPERTY_X86_UINT32_VALID. bfd/ PR ld/23900 * elf.c (get_program_header_size): Add a PT_GNU_PROPERTY segment for NOTE_GNU_PROPERTY_SECTION_NAME. (_bfd_elf_map_sections_to_segments): Create a PT_GNU_PROPERTY segment for NOTE_GNU_PROPERTY_SECTION_NAME. * elfxx-x86.c (_bfd_elf_link_setup_gnu_properties): Don't set GNU_PROPERTY_X86_UINT32_VALID. binutils/ PR ld/23900 * readelf.c (get_segment_type): Support PT_GNU_PROPERTY. (decode_x86_isa): Don't check GNU_PROPERTY_X86_UINT32_VALID. (decode_x86_feature_1): Likewise. (decode_x86_feature_2): Likewise. (print_gnu_property_note): Remove GNU_PROPERTY_X86_UINT32_VALID check. * testsuite/binutils-all/i386/empty.d: Updated. * testsuite/binutils-all/x86-64/empty-x32.d: Likewise. * testsuite/binutils-all/x86-64/empty.d: Likewise. * testsuite/binutils-all/i386/pr21231b.s: Change GNU_PROPERTY_X86_ISA_1_USED bits to 0x7fffffff. * testsuite/binutils-all/x86-64/pr21231b.s: Likewise. gas/ PR ld/23900 * config/tc-i386.c (x86_cleanup): Don't set GNU_PROPERTY_X86_UINT32_VALID. * testsuite/gas/i386/property-1.s: Change GNU_PROPERTY_X86_ISA_1_USED bits to 0. include/ PR ld/23900 * elf/common.h (PT_GNU_PROPERTY): New. (GNU_PROPERTY_X86_UINT32_VALID): Removed. ld/ PR ld/23900 * testsuite/ld-elf/elf.exp: Run PR ld/23900 test. * testsuite/ld-elf/pr23900-1-32.rd: New file. * testsuite/ld-elf/pr23900-1-64.rd: Likewise. * testsuite/ld-elf/pr23900-1.d: Likewise. * testsuite/ld-elf/pr23900-1.s: Likewise. * testsuite/ld-elf/pr23900-2.s: Likewise. * testsuite/ld-elf/pr23900-2a.d: Likewise. * testsuite/ld-elf/pr23900-2b.d: Likewise. * testsuite/ld-i386/ibt-plt-1.d: Adjusted. * testsuite/ld-i386/ibt-plt-2c.d: Likewise. * testsuite/ld-i386/ibt-plt-2d.d: Likewise. * testsuite/ld-i386/ibt-plt-3d.d: Likewise. * testsuite/ld-x86-64/ibt-plt-1-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-1.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2c-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2c.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2d-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2c.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3c-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3c.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3d-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3d.d: Likewise. * testsuite/ld-i386/pr23372c.d: Expect <None> for GNU_PROPERTY_X86_ISA_1_USED. * testsuite/ld-x86-64/pr23372c-x32.d: Likewise. * testsuite/ld-x86-64/pr23372c.d: Likewise. * testsuite/ld-x86-64/pr23372d-x32.d: Likewise. * testsuite/ld-x86-64/pr23372d.d: Likewise. * testsuite/ld-x86-64/property-x86-5a.s: Change GNU_PROPERTY_X86_ISA_1_USED bits to 0. * testsuite/ld-x86-64/property-x86-5b.s: Likewise.
53 lines
1.8 KiB
D
53 lines
1.8 KiB
D
#source: ibt-plt-2.s
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#as: --32
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#ld: -shared -m elf_i386 -z ibt --hash-style=sysv -z noseparate-code
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#objdump: -dw
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.*: +file format .*
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Disassembly of section .plt:
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[a-f0-9]+ <.plt>:
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+[a-f0-9]+: ff b3 04 00 00 00 pushl 0x4\(%ebx\)
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+[a-f0-9]+: ff a3 08 00 00 00 jmp \*0x8\(%ebx\)
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+[a-f0-9]+: 0f 1f 40 00 nopl 0x0\(%eax\)
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+[a-f0-9]+: f3 0f 1e fb endbr32
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+[a-f0-9]+: 68 00 00 00 00 push \$0x0
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+[a-f0-9]+: e9 e2 ff ff ff jmp [a-f0-9]+ <.plt>
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+[a-f0-9]+: 66 90 xchg %ax,%ax
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+[a-f0-9]+: f3 0f 1e fb endbr32
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+[a-f0-9]+: 68 08 00 00 00 push \$0x8
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+[a-f0-9]+: e9 d2 ff ff ff jmp [a-f0-9]+ <.plt>
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+[a-f0-9]+: 66 90 xchg %ax,%ax
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Disassembly of section .plt.sec:
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[a-f0-9]+ <bar1@plt>:
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+[a-f0-9]+: f3 0f 1e fb endbr32
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+[a-f0-9]+: ff a3 0c 00 00 00 jmp \*0xc\(%ebx\)
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+[a-f0-9]+: 66 0f 1f 44 00 00 nopw 0x0\(%eax,%eax,1\)
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[a-f0-9]+ <bar2@plt>:
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+[a-f0-9]+: f3 0f 1e fb endbr32
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+[a-f0-9]+: ff a3 10 00 00 00 jmp \*0x10\(%ebx\)
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+[a-f0-9]+: 66 0f 1f 44 00 00 nopw 0x0\(%eax,%eax,1\)
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Disassembly of section .text:
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[a-f0-9]+ <foo>:
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+[a-f0-9]+: 53 push %ebx
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+[a-f0-9]+: e8 18 00 00 00 call [0-9a-f]+ <__x86.get_pc_thunk.bx>
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+[a-f0-9]+: 81 c3 ([0-9a-f]{2} ){4}[ ]+add \$0x[a-f0-9]+,%ebx
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+[a-f0-9]+: 83 ec 08 sub \$0x8,%esp
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+[a-f0-9]+: e8 dc ff ff ff call [a-f0-9]+ <bar2@plt>
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+[a-f0-9]+: e8 c7 ff ff ff call [a-f0-9]+ <bar1@plt>
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+[a-f0-9]+: 83 c4 08 add \$0x8,%esp
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+[a-f0-9]+: 5b pop %ebx
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+[a-f0-9]+: c3 ret
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[a-f0-9]+ <__x86.get_pc_thunk.bx>:
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+[a-f0-9]+: 8b 1c 24 mov \(%esp\),%ebx
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+[a-f0-9]+: c3 ret
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#pass
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