derek.holloway
7502bf64a4
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108 lines
3.7 KiB
ArmAsm
108 lines
3.7 KiB
ArmAsm
// REQUIRES: aarch64
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// RUN: rm -rf %t && split-file %s %t && cd %t
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// RUN: llvm-mc -mattr=+bti -filetype=obj -triple=aarch64 asm -o a.o
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// RUN: ld.lld --script lds -fix-cortex-a53-843419 -verbose a.o -o exe \
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// RUN: 2>&1 | FileCheck -check-prefix=CHECK-PRINT %s
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// RUN: llvm-objdump --no-print-imm-hex --no-show-raw-insn --triple=aarch64-linux-gnu -d exe | FileCheck %s
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/// Test case for specific crash wrt interaction between thunks and errata
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/// patches where the size of the added thunks meant that a range-extension
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/// thunk to the patch was required. We need to check that a BTI Thunk is
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/// generated for the patch, and that the patch's direct branch return is also
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/// range extended, possibly needing another BTI Thunk.
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///
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/// The asm below is based on a crash that was happening in Chromium.
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/// For more information see https://issues.chromium.org/issues/440019454
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//--- asm
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.section .note.gnu.property,"a"
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.p2align 3
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.long 4
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.long 0x10 // descriptor length
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.long 0x5 // GNU property type
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.asciz "GNU"
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.long 0xc0000000 // GNU_PROPERTY_AARCH64_FEATURE_1_AND
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.long 4
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.long 1 // GNU_PROPERTY_AARCH64_FEATURE_1_BTI
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.long 0
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.section .text.01, "ax", %progbits
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.balign 4096
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.globl _start
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.type _start, %function
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_start:
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bl far_away_no_bti
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.section .text.far, "ax", %progbits
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.globl far_away_no_bti
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.type far_away, function
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far_away_no_bti:
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.space 4096 - 28, 0
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adrp x0, dat
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ldr x1, [x1, #0]
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ldr x0, [x0, :got_lo12:dat]
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.space 0x8000000, 0
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ret
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.section .data
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.globl dat
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dat: .quad 0
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// CHECK-PRINT: detected cortex-a53-843419 erratum sequence starting at 8010FFC in unpatched output.
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// CHECK: 0000000000010000 <_start>:
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// CHECK-NEXT: 10000: bl 0x10008 <__AArch64AbsLongThunk_far_away_no_bti>
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// CHECK: <__AArch64AbsLongThunk_far_away_no_bti>:
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// CHECK-NEXT: 10008: ldr x16, 0x10010
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// CHECK-NEXT: br x16
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// CHECK-NEXT: 10010: 18 00 01 08 .word 0x08010018
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// Check that the BTI thunks do NOT have their size rounded up to 4 KiB.
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// They precede the patch and they contain the landing pad.
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// CHECK: <__AArch64BTIThunk_far_away_no_bti>:
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// CHECK-NEXT: 8010018: bti c
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// CHECK-NEXT: b 0x8010038 <far_away_no_bti>
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// CHECK: <__AArch64AbsLongThunk___CortexA53843419_8011004>:
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// CHECK-NEXT: 8010020: ldr x16, 0x8010028
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// CHECK-NEXT: br x16
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// CHECK-NEXT: 8010028: 34 10 01 10 .word 0x10011034
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// CHECK: <__AArch64BTIThunk_>:
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// CHECK-NEXT: 8010030: bti c
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// CHECK-NEXT: b 0x8011028 <far_away_no_bti+0xff0>
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// CHECK: 8010038 <far_away_no_bti>:
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// CHECK-NEXT: ...
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// CHECK-NEXT: 801101c: adrp x0, 0x10012000
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// CHECK-NEXT: ldr x1, [x1]
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// CHECK-NEXT: b 0x8010020 <__AArch64AbsLongThunk___CortexA53843419_8011004>
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// CHECK-NEXT: ...
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// CHECK-NEXT: 10011028: ret
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// Check that the errata thunk does NOT contain a landing pad
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// CHECK: <__CortexA53843419_8011004>:
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// CHECK-NEXT: 1001102c: ldr x0, [x0, #64]
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// CHECK-NEXT: b 0x10011040 <__AArch64AbsLongThunk_>
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// Rest of generated code for readability
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// CHECK: <__AArch64BTIThunk___CortexA53843419_8011004>:
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// CHECK-NEXT: 10011034: bti c
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// CHECK-NEXT: b 0x1001102c <__CortexA53843419_8011004>
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// CHECK: <__AArch64AbsLongThunk_>
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// CHECK-NEXT: 10011040: ldr x16, 0x10011048
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// CHECK-NEXT: br x16
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// CHECK-NEXT: 10011048: 30 00 01 08 .word 0x08010030
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//--- lds
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SECTIONS {
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.text 0x10000 : {
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*(.text.01);
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. += 0x8000000;
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*(.text.far);
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}
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}
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