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[HWASan] Update HWASan assembly snippet in the docs

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Summary: To complement https://reviews.llvm.org/D45840

Reviewers: eugenis

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D45996

llvm-svn: 330745
This commit is contained in:
Alex Shlyapnikov 2018-04-24 17:41:48 +00:00
parent 5f1d10e26e
commit e55bbac546
1 changed files with 10 additions and 9 deletions
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19
clang/docs/HardwareAssistedAddressSanitizerDesign.rst
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@ -52,15 +52,16 @@ verifies the tags. Currently, the following sequence is used:
// int foo(int *a) { return *a; }
// clang -O2 --target=aarch64-linux -fsanitize=hwaddress -c load.c
foo:
0: 08 dc 44 d3 ubfx x8, x0, #4, #52 // shadow address
4: 08 01 40 39 ldrb w8, [x8] // load shadow
8: 09 fc 78 d3 lsr x9, x0, #56 // address tag
c: 3f 01 08 6b cmp w9, w8 // compare tags
10: 61 00 00 54 b.ne #12 // jump on mismatch
14: 00 00 40 b9 ldr w0, [x0] // original load
18: c0 03 5f d6 ret
1c: 40 20 21 d4 brk #0x902 // trap
0: 08 00 00 90 adrp x8, 0 <__hwasan_shadow>
4: 08 01 40 f9 ldr x8, [x8] // shadow base (to be resolved by the loader)
8: 09 dc 44 d3 ubfx x9, x0, #4, #52 // shadow offset
c: 28 69 68 38 ldrb w8, [x9, x8] // load shadow tag
10: 09 fc 78 d3 lsr x9, x0, #56 // extract address tag
14: 3f 01 08 6b cmp w9, w8 // compare tags
18: 61 00 00 54 b.ne 24 // jump on mismatch
1c: 00 00 40 b9 ldr w0, [x0] // original load
20: c0 03 5f d6 ret
24: 40 20 21 d4 brk #0x902 // trap
Alternatively, memory accesses are prefixed with a function call.