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Added patch from mozbz#1375074 - fixes aarch64 baseline JIT crashes

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This commit is contained in:
Martin Stransky 2018-05-03 13:43:55 +02:00
parent 37e796da25
commit 343041014c
2 changed files with 80 additions and 1 deletions
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74
bug1375074-save-restore-x28.patch Normal file
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@ -0,0 +1,74 @@
# HG changeset patch
# User Lars T Hansen <lhansen@mozilla.com>
# Date 1519822672 -3600
# Wed Feb 28 13:57:52 2018 +0100
# Node ID 672f0415217b202ae59a930769dffd9d6ba6b87c
# Parent 825fd04dacc6297d3a980ec4184079405950b35d
Bug 1375074 - Save and restore non-volatile x28 on ARM64 for generated unboxed object constructor.
diff --git a/js/src/jit-test/tests/bug1375074.js b/js/src/jit-test/tests/bug1375074.js
new file mode 100644
--- /dev/null
+++ b/js/src/jit-test/tests/bug1375074.js
@@ -0,0 +1,18 @@
+// This forces the VM to start creating unboxed objects and thus stresses a
+// particular path into generated code for a specialized unboxed object
+// constructor.
+
+var K = 2000; // 2000 should be plenty
+var s = "[";
+var i;
+for ( i=0; i < K-1; i++ )
+ s = s + `{"i":${i}},`;
+s += `{"i":${i}}]`;
+var v = JSON.parse(s);
+
+assertEq(v.length == K, true);
+
+for ( i=0; i < K; i++) {
+ assertEq(v[i] instanceof Object, true);
+ assertEq(v[i].i, i);
+}
diff --git a/js/src/vm/UnboxedObject.cpp b/js/src/vm/UnboxedObject.cpp
--- a/js/src/vm/UnboxedObject.cpp
+++ b/js/src/vm/UnboxedObject.cpp
@@ -95,7 +95,15 @@ UnboxedLayout::makeConstructorCode(JSCon
#endif
#ifdef JS_CODEGEN_ARM64
- // ARM64 communicates stack address via sp, but uses a pseudo-sp for addressing.
+ // ARM64 communicates stack address via sp, but uses a pseudo-sp (PSP) for
+ // addressing. The register we use for PSP may however also be used by
+ // calling code, and it is nonvolatile, so save it. Do this as a special
+ // case first because the generic save/restore code needs the PSP to be
+ // initialized already.
+ MOZ_ASSERT(PseudoStackPointer64.Is(masm.GetStackPointer64()));
+ masm.Str(PseudoStackPointer64, vixl::MemOperand(sp, -16, vixl::PreIndex));
+
+ // Initialize the PSP from the SP.
masm.initStackPtr();
#endif
@@ -233,7 +241,22 @@ UnboxedLayout::makeConstructorCode(JSCon
masm.pop(ScratchDoubleReg);
masm.PopRegsInMask(savedNonVolatileRegisters);
+#ifdef JS_CODEGEN_ARM64
+ // Now restore the value that was in the PSP register on entry, and return.
+
+ // Obtain the correct SP from the PSP.
+ masm.Mov(sp, PseudoStackPointer64);
+
+ // Restore the saved value of the PSP register, this value is whatever the
+ // caller had saved in it, not any actual SP value, and it must not be
+ // overwritten subsequently.
+ masm.Ldr(PseudoStackPointer64, vixl::MemOperand(sp, 16, vixl::PostIndex));
+
+ // Perform a plain Ret(), as abiret() will move SP <- PSP and that is wrong.
+ masm.Ret(vixl::lr);
+#else
masm.abiret();
+#endif
masm.bind(&failureStoreOther);

7
firefox.spec
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@ -102,7 +102,7 @@
Summary: Mozilla Firefox Web browser
Name: firefox
Version: 60.0
Release: 2%{?pre_tag}%{?dist}
Release: 3%{?pre_tag}%{?dist}
URL: https://www.mozilla.org/firefox/
License: MPLv1.1 or GPLv2+ or LGPLv2+
Source0: https://hg.mozilla.org/releases/mozilla-release/archive/firefox-%{version}%{?pre_version}.source.tar.xz
@ -158,6 +158,7 @@ Patch413: mozilla-1353817.patch
Patch414: mozilla-1435212-ffmpeg-4.0.patch
Patch415: Bug-1238661---fix-mozillaSignalTrampoline-to-work-.patch
Patch416: mozilla-1424422.patch
Patch417: bug1375074-save-restore-x28.patch
Patch421: complete-csd-window-offset-mozilla-1457691.patch
@ -329,6 +330,7 @@ This package contains results of tests executed during build.
%patch415 -p1 -b .mozilla-1238661
%endif
%patch416 -p1 -b .1424422
%patch417 -p1 -b .bug1375074-save-restore-x28
%patch421 -p1 -b .mozilla-1457691
@ -871,6 +873,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
#---------------------------------------------------------------------
%changelog
* Thu May 3 2018 Martin Stransky <stransky@redhat.com> - 60.0-3
- Added patch from mozbz#1375074 - fixes aarch64 baseline JIT crashes
* Thu May 3 2018 Martin Stransky <stransky@redhat.com> - 60.0-2
- Make Wayland backend optional and disable it by default due to WebGL issues.