commit 1c11cfe0e66d91580e1ec337195a417e3bc24abd
author Martin Storsjö <martin@martin.st> Sat May 07 00:26:45 2022 +0300
committer Copybara-Service <copybara-worker@google.com> Mon Jun 06 13:31:16 2022 -0700
tree add31a8388ce554c22a29750345198a69f6565ef
parent 2c4970601e8e7cec1350afc0814d535b34c015d8

[libunwind] Fix SEH unwinding on ARM

Check `__SEH__` when checking if ARM EHABI should be implied,
similarly to 4a3722a2c3dff1fe885cc38bf43d3c095c9851e7 / D126866.

Fix a warning by using the right format specifier (PRIxPTR instead
of PRIx64), and add a double->float cast in a codepath that hasn't
been built so far.

This is enough to make SEH unwinding of itanium ABI exceptions on
ARM mostly work - one specific issue is fixed in a separate follow-up
patch.

Differential Revision: https://reviews.llvm.org/D126867

NOKEYCHECK=True
GitOrigin-RevId: 7c0e93cb89e6aa74881411213abf83faae7c58ee

src/UnwindCursor.hpp

diff --git a/src/UnwindCursor.hpp b/src/UnwindCursor.hpp
index 6e8fc45..dc334ed 100644
--- a/src/UnwindCursor.hpp
+++ b/src/UnwindCursor.hpp
@@ -863,7 +863,7 @@
       uint32_t w;
       float f;
     } d;
-    d.f = value;
+    d.f = (float)value;
     _msContext.S[regNum - UNW_ARM_S0] = d.w;
   }
   if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) {