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6e28f8bb40
Don't mark SP as clobbered because newer clang versions do not like that. Fixes https://github.com/dart-lang/sdk/issues/46873 TEST=ci Cq-Include-Trybots: luci.dart.try:vm-ffi-android-release-arm-try,vm-ffi-android-product-arm-try Change-Id: I5b794e7bb02e62576c4c40b8132f9c798cb7639c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/209917 Commit-Queue: Slava Egorov <vegorov@google.com> Reviewed-by: Daco Harkes <dacoharkes@google.com>
44 lines
1.7 KiB
ArmAsm
44 lines
1.7 KiB
ArmAsm
// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Work around for a bug in old kernels (only fixed in 3.18 Android kernel):
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//
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// Kernel does not clear If-Then execution state bits when entering ARM signal
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// handler which violates requirements imposed by ARM architecture reference.
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// Some CPUs look at these bits even while in ARM mode which causes them
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// to skip some instructions in the prologue of the signal handler.
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//
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// To work around the issue we insert enough NOPs in the prologue to ensure
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// that no actual instructions are skipped and then branch to the actual
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// signal handler.
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//
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// For the kernel patch that fixes the issue see:
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// http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6ecf830e5029598732e04067e325d946097519cb
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//
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// Note: can't use DART_* defines here because this file does not include
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// globals.h.
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#if !defined(PRODUCT) && defined(__ARMEL__) && defined(__ANDROID__) && \
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!defined(__thumb__)
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.text
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.globl ThreadInterruptSignalHandlerTrampoline
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.hidden ThreadInterruptSignalHandlerTrampoline
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.type ThreadInterruptSignalHandlerTrampoline, %function
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ThreadInterruptSignalHandlerTrampoline:
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// IT (If-Then) instruction makes up to four instructions that follow it
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// conditional.
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nop
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nop
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nop
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nop
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// Tail-call the actual handler.
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// Note: no need to use interworking because we know that we are not
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// compiling for Thumb.
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b ThreadInterruptSignalHandler
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.size ThreadInterruptSignalHandlerTrampoline,.-ThreadInterruptSignalHandlerTrampoline
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#endif
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