53 lines
2.1 KiB
Diff
53 lines
2.1 KiB
Diff
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From b6fd4598c5367e78b5841fd99412484f0e86fc21 Mon Sep 17 00:00:00 2001
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From: Amanieu d'Antras <amanieu@gmail.com>
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Date: Wed, 1 Jan 2020 17:11:45 +0100
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Subject: [PATCH] Update the barrier cache during ARM EHABI unwinding
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---
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src/libpanic_unwind/gcc.rs | 8 +++++++-
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src/libunwind/libunwind.rs | 2 ++
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2 files changed, 9 insertions(+), 1 deletion(-)
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diff --git a/src/libpanic_unwind/gcc.rs b/src/libpanic_unwind/gcc.rs
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index 4f572fe21b30..328d0d4ce7be 100644
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--- a/src/libpanic_unwind/gcc.rs
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+++ b/src/libpanic_unwind/gcc.rs
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@@ -187,7 +187,13 @@ cfg_if::cfg_if! {
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match eh_action {
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EHAction::None |
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EHAction::Cleanup(_) => return continue_unwind(exception_object, context),
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- EHAction::Catch(_) => return uw::_URC_HANDLER_FOUND,
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+ EHAction::Catch(_) => {
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+ // EHABI requires the personality routine to update the
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+ // SP value in the barrier cache of the exception object.
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+ (*exception_object).private[5] =
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+ uw::_Unwind_GetGR(context, uw::UNWIND_SP_REG);
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+ return uw::_URC_HANDLER_FOUND;
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+ }
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EHAction::Terminate => return uw::_URC_FAILURE,
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}
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} else {
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diff --git a/src/libunwind/libunwind.rs b/src/libunwind/libunwind.rs
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index 0b39503c0d03..30658ce328d8 100644
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--- a/src/libunwind/libunwind.rs
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+++ b/src/libunwind/libunwind.rs
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@@ -23,6 +23,7 @@ pub type _Unwind_Word = uintptr_t;
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pub type _Unwind_Ptr = uintptr_t;
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pub type _Unwind_Trace_Fn = extern "C" fn(ctx: *mut _Unwind_Context, arg: *mut c_void)
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-> _Unwind_Reason_Code;
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+
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#[cfg(target_arch = "x86")]
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pub const unwinder_private_data_size: usize = 5;
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@@ -151,6 +152,7 @@ if #[cfg(all(any(target_os = "ios", target_os = "netbsd", not(target_arch = "arm
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use _Unwind_VRS_DataRepresentation::*;
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pub const UNWIND_POINTER_REG: c_int = 12;
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+ pub const UNWIND_SP_REG: c_int = 13;
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pub const UNWIND_IP_REG: c_int = 15;
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#[cfg_attr(all(feature = "llvm-libunwind",
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--
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2.24.1
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