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68bb0359ee
This patch aims to improve the definitions of BTI and PAC based PLTs.
The following changes are made:
* PLT0 does not need PAC instructions since the PLTGOT[2] (and PLTGOT[1])
are readonly so they cannot be corrupted at runtime. Thus both PAC plt0
and BTI+PAC plt0 are removed and we can use basic plt0 and BTI plt0
instead, respectively.
* We can remove the extra padding nops when we add the new bti instructions.
BTI plt0 and BTI TLSDESC plt are updated.
* For better performance PLTn could be padded to 24bytes. Both BTI pltn and
PAC pltn are updated.
*** bfd/ChangeLog ***
2019-04-25 Sudakshina Das <sudi.das@arm.com>
* elfnn-aarch64.c (PLT_BTI_ENTRY_SIZE): Remove.
(PLT_BTI_TLSDESC_ENTRY_SIZE): Remove.
(PLT_PAC_ENTRY_SIZE, PLT_BTI_PAC_ENTRY_SIZE): Remove.
(PLT_BTI_SMALL_ENTRY_SIZE, PLT_PAC_SMALL_ENTRY_SIZE): Update.
(elfNN_aarch64_small_plt0_pac_entry): Remove.
(elfNN_aarch64_small_plt0_bti_pac_entry): Remove.
(elfNN_aarch64_small_plt0_bti_entry): Update.
(elfNN_aarch64_small_plt_bti_entry): Update.
(elfNN_aarch64_small_plt_pac_entry): Update.
(elfNN_aarch64_tlsdesc_small_plt_bti_entry): Update.
(setup_plt_values): Setup new entries.
(elfNN_aarch64_finish_dynamic_sections): Remove size change.
(elfNN_aarch64_plt_sym_val): Likewise.
*** ld/ChangeLog ***
2019-04-25 Sudakshina Das <sudi.das@arm.com>
* testsuite/ld-aarch64/bti-pac-plt-1.d: Update.
* testsuite/ld-aarch64/bti-pac-plt-2.d: Update.
* testsuite/ld-aarch64/bti-plt-1.d: Update.
* testsuite/ld-aarch64/bti-plt-3.d: Update.
* testsuite/ld-aarch64/bti-plt-5.d: Update.
* testsuite/ld-aarch64/pac-plt-1.d: Update.
* testsuite/ld-aarch64/pac-plt-2.d: Update.
29 lines
682 B
Makefile
29 lines
682 B
Makefile
#name: BTI PLT with only GNU PROP
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#source: property-bti-pac1.s
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#as: -mabi=lp64 -defsym __property_bti__=1
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#ld: -e _start -L./tmpdir -lbti-plt-so
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#objdump: -dr -j .plt
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#target: *linux*
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[^:]*: *file format elf64-.*aarch64
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Disassembly of section \.plt:
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[0-9a-f]+ <.*>:
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.*: d503245f bti c
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.*: a9bf7bf0 stp x16, x30, \[sp, #-16\]!
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.*: 90000090 adrp x16, 410000 <.*>
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.*: f9421611 ldr x17, \[x16, #1064\]
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.*: 9110a210 add x16, x16, #0x428
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.*: d61f0220 br x17
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.*: d503201f nop
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.*: d503201f nop
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[0-9a-f]+ <.*>:
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.*: d503245f bti c
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.*: 90000090 adrp x16, 410000 <.*>
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.*: f9421a11 ldr x17, \[x16, #1072\]
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.*: 9110c210 add x16, x16, #0x430
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.*: d61f0220 br x17
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.*: d503201f nop
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