dc9f65be45
Fix a couple of things that were causing stack protection to not work correctly in functions that have scalable vectors on the stack: * Use TypeSize when determining if accesses to a variable are considered out-of-bounds so that the behaviour is correct for scalable vectors. * When stack protection is enabled move the stack protector location to the top of the SVE locals, so that any overflow in them (or the other locals which are below that) will be detected. Fixes: https://github.com/llvm/llvm-project/issues/51137 Differential Revision: https://reviews.llvm.org/D111631
48 lines
2.6 KiB
YAML
48 lines
2.6 KiB
YAML
# RUN: llc -mtriple=aarch64--linux-gnu -mattr=+sve -start-before=localstackalloc -stop-after=prologepilog -o - %s | FileCheck %s
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--- |
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@__stack_chk_guard = external global i8*
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define i32 @main(i32, i8**) {
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%StackGuardSlot = alloca i8*
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unreachable
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}
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...
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---
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name: main
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tracksRegLiveness: true
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frameInfo:
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# CHECK: stackSize: 544
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# CHECK: localFrameSize: 516
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stackProtector: '%stack.3.StackGuardSlot'
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stack:
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# Stack objects 0 and 1 should end up in the local stack area, objects 2 and 3
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# should end up in the SVE stack area with 3 (the stack guard) on top.
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- { id: 0, size: 512, alignment: 1, stack-id: default }
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# CHECK: - { id: 0, name: '', type: default, offset: -528, size: 512, alignment: 1,
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# CHECK-NEXT: stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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# CHECK-NEXT: local-offset: -512, debug-info-variable: '', debug-info-expression: '',
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# CHECK-NEXT: debug-info-location: '' }
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- { id: 1, size: 4, alignment: 4, stack-id: default }
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# CHECK: - { id: 1, name: '', type: default, offset: -532, size: 4, alignment: 4,
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# CHECK-NEXT: stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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# CHECK-NEXT: local-offset: -516, debug-info-variable: '', debug-info-expression: '',
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# CHECK-NEXT: debug-info-location: '' }
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- { id: 2, size: 16, alignment: 16, stack-id: scalable-vector }
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# CHECK: - { id: 2, name: '', type: default, offset: -32, size: 16, alignment: 16,
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# CHECK-NEXT: stack-id: scalable-vector, callee-saved-register: '', callee-saved-restored: true,
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# CHECK-NEXT: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 3, name: StackGuardSlot, size: 8, alignment: 16, stack-id: scalable-vector }
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# CHECK: - { id: 3, name: StackGuardSlot, type: default, offset: -16, size: 8,
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# CHECK-NEXT: alignment: 16, stack-id: scalable-vector, callee-saved-register: '',
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# CHECK-NEXT: callee-saved-restored: true, debug-info-variable: '', debug-info-expression: '',
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# CHECK-NEXT: debug-info-location: '' }
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body: |
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bb.0:
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%25:gpr64common = LOAD_STACK_GUARD :: (dereferenceable invariant load (s64) from @__stack_chk_guard)
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STRXui killed %25, %stack.3.StackGuardSlot, 0 :: (volatile store (s64) into %stack.3.StackGuardSlot)
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%28:gpr64 = LDRXui %stack.3.StackGuardSlot, 0 :: (volatile load (s64) from %stack.3.StackGuardSlot)
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%29:gpr64common = LOAD_STACK_GUARD :: (dereferenceable invariant load (s64) from @__stack_chk_guard)
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RET_ReallyLR implicit undef $w0, implicit killed %28, implicit killed %29
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...
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