Author: alekseyshl Date: Tue Apr 24 10:41:48 2018 New Revision: 330745 URL: http://llvm.org/viewvc/llvm-project?rev=330745&view=rev Log: [HWASan] Update HWASan assembly snippet in the docs
Summary: To complement https://reviews.llvm.org/D45840 Reviewers: eugenis Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D45996 Modified: cfe/trunk/docs/HardwareAssistedAddressSanitizerDesign.rst Modified: cfe/trunk/docs/HardwareAssistedAddressSanitizerDesign.rst URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/HardwareAssistedAddressSanitizerDesign.rst?rev=330745&r1=330744&r2=330745&view=diff ============================================================================== --- cfe/trunk/docs/HardwareAssistedAddressSanitizerDesign.rst (original) +++ cfe/trunk/docs/HardwareAssistedAddressSanitizerDesign.rst Tue Apr 24 10:41:48 2018 @@ -52,15 +52,16 @@ verifies the tags. Currently, the follow // 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. _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
