1 files changed, 0 insertions, 75 deletions
diff --git a/mail/thunderbird/files/patch-bug1445907 b/mail/thunderbird/files/patch-bug1445907
deleted file mode 100644
index 924ac0aa7cd7..000000000000
--- a/mail/thunderbird/files/patch-bug1445907
+++ /dev/null
@@ -1,75 +0,0 @@
-commit 0c6dd4a750db
-Author: Lars T Hansen <lhansen@mozilla.com>
-Date:   Mon Mar 19 09:58:06 2018 +0100
-
-    Bug 1445907 - Save x28 before clobbering it in the regex compiler. r=sstangl
----
- js/src/irregexp/NativeRegExpMacroAssembler.cpp | 25 ++++++++++++++++++++++++-
- js/src/jit-test/tests/regexp/bug1445907.js     | 15 +++++++++++++++
- 2 files changed, 39 insertions(+), 1 deletion(-)
-
-diff --git js/src/irregexp/NativeRegExpMacroAssembler.cpp js/src/irregexp/NativeRegExpMacroAssembler.cpp
-index 28a4c35e75bfe..c08b005cf856b 100644
---- js/src/irregexp/NativeRegExpMacroAssembler.cpp
-+++ js/src/irregexp/NativeRegExpMacroAssembler.cpp
-@@ -123,7 +123,15 @@ NativeRegExpMacroAssembler::GenerateCode(JSContext* cx, bool match_only)
-     masm.bind(&entry_label_);
- 
- #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
- 
-@@ -421,7 +429,22 @@ NativeRegExpMacroAssembler::GenerateCode(JSContext* cx, bool match_only)
-     for (GeneralRegisterBackwardIterator iter(savedNonVolatileRegisters); iter.more(); ++iter)
-         masm.Pop(*iter);
- 
-+#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
- 
-     // Backtrack code (branch target for conditional backtracks).
-     if (backtrack_label_.used()) {
-diff --git js/src/jit-test/tests/regexp/bug1445907.js js/src/jit-test/tests/regexp/bug1445907.js
-new file mode 100644
-index 0000000000000..75b23753eaf93
---- /dev/null
-+++ js/src/jit-test/tests/regexp/bug1445907.js
-@@ -0,0 +1,15 @@
-+// On ARM64, we failed to save x28 properly when generating code for the regexp
-+// matcher.
-+//
-+// There's wasm and Debugger code here because the combination forces the use of
-+// x28 and exposes the bug when running on the simulator.
-+
-+if (!wasmIsSupported())
-+    quit();
-+
-+var g = newGlobal('');
-+var dbg = new Debugger(g);
-+g.eval(`var m = new WebAssembly.Instance(new WebAssembly.Module(wasmTextToBinary('(module (func (export "test")))')))`);
-+var re = /./;
-+dbg.onEnterFrame = function(frame) { re.exec("x") };
-+result = g.eval("m.exports.test()");