--- qtwebengine-5.15.12_p20240122/src/3rdparty/chromium/v8/src/regexp/ppc/regexp-macro-assembler-ppc.h.orig	2021-01-20 02:18:44.000000000 +0100
+++ qtwebengine-5.15.12_p20240122/src/3rdparty/chromium/v8/src/regexp/ppc/regexp-macro-assembler-ppc.h	2024-03-23 15:44:16.821002068 +0100
@@ -81,7 +81,7 @@
   // returning.
   // {raw_code} is an Address because this is called via ExternalReference.
   static int CheckStackGuardState(Address* return_address, Address raw_code,
-                                  Address re_frame);
+                                  Address re_frame, uintptr_t extra_space);
 
  private:
   // Offsets from frame_pointer() of function parameters and stored registers.
@@ -127,7 +127,8 @@
 
 
   // Generate a call to CheckStackGuardState.
-  void CallCheckStackGuardState(Register scratch);
+  void CallCheckStackGuardState(
+      Register scratch, Operand extra_space_for_variables = Operand::Zero());
 
   // The ebp-relative location of a regexp register.
   MemOperand register_location(int register_index);
--- qtwebengine-5.15.12_p20240122/src/3rdparty/chromium/v8/src/regexp/ppc/regexp-macro-assembler-ppc.cc.orig	2024-03-23 15:26:25.673652360 +0100
+++ qtwebengine-5.15.12_p20240122/src/3rdparty/chromium/v8/src/regexp/ppc/regexp-macro-assembler-ppc.cc	2024-03-23 15:43:36.821609443 +0100
@@ -710,11 +710,13 @@
     __ mov(r3, Operand(stack_limit));
     __ LoadP(r3, MemOperand(r3));
     __ sub(r3, sp, r3, LeaveOE, SetRC);
+    Operand extra_space_for_variables(num_registers_ * kSystemPointerSize);
+
     // Handle it if the stack pointer is already below the stack limit.
     __ ble(&stack_limit_hit, cr0);
     // Check if there is room for the variable number of registers above
     // the stack limit.
-    __ Cmpli(r3, Operand(num_registers_ * kSystemPointerSize), r0);
+    __ Cmpli(r3, extra_space_for_variables, r0);
     __ bge(&stack_ok);
     // Exit with OutOfMemory exception. There is not enough space on the stack
     // for our working registers.
@@ -722,7 +724,7 @@
     __ b(&return_r3);
 
     __ bind(&stack_limit_hit);
-    CallCheckStackGuardState(r3);
+      CallCheckStackGuardState(r3, extra_space_for_variables);
     __ cmpi(r3, Operand::Zero());
     // If returned value is non-zero, we exit with the returned value as result.
     __ bne(&return_r3);
@@ -1097,7 +1099,8 @@
 
 // Private methods:
 
-void RegExpMacroAssemblerPPC::CallCheckStackGuardState(Register scratch) {
+void RegExpMacroAssemblerPPC::CallCheckStackGuardState(Register scratch,
+                                                       Operand extra_space) {
   DCHECK(!isolate()->IsGeneratingEmbeddedBuiltins());
   DCHECK(!masm_->options().isolate_independent_code);
 
@@ -1128,10 +1131,12 @@
   __ li(r0, Operand::Zero());
   __ StorePU(r0, MemOperand(sp, -stack_space * kSystemPointerSize));
 
+  // Extra space for variables to consider in stack check.
+  __ mov(arg_reg_4, extra_space);
   // RegExp code frame pointer.
-  __ mr(r5, frame_pointer());
+  __ mr(arg_reg_3, frame_pointer());
   // Code of self.
-  __ mov(r4, Operand(masm_->CodeObject()));
+  __ mov(arg_reg_2, Operand(masm_->CodeObject()));
   // r3 will point to the return address, placed by DirectCEntry.
   __ addi(r3, sp, Operand(kStackFrameExtraParamSlot * kSystemPointerSize));
 
@@ -1156,7 +1161,6 @@
   __ mov(code_pointer(), Operand(masm_->CodeObject()));
 }
 
-
 // Helper function for reading a value out of a stack frame.
 template <typename T>
 static T& frame_entry(Address re_frame, int frame_offset) {
@@ -1171,7 +1175,8 @@
 
 int RegExpMacroAssemblerPPC::CheckStackGuardState(Address* return_address,
                                                   Address raw_code,
-                                                  Address re_frame) {
+                                                  Address re_frame,
+                                                  uintptr_t extra_space) {
   Code re_code = Code::cast(Object(raw_code));
   return NativeRegExpMacroAssembler::CheckStackGuardState(
       frame_entry<Isolate*>(re_frame, kIsolate),
@@ -1181,10 +1186,10 @@
       return_address, re_code,
       frame_entry_address<Address>(re_frame, kInputString),
       frame_entry_address<const byte*>(re_frame, kInputStart),
-      frame_entry_address<const byte*>(re_frame, kInputEnd));
+      frame_entry_address<const byte*>(re_frame, kInputEnd),
+      extra_space);
 }
 
-
 MemOperand RegExpMacroAssemblerPPC::register_location(int register_index) {
   DCHECK(register_index < (1 << 30));
   if (num_registers_ <= register_index) {