From: Allan Sandfeld Jensen <allan.jensen@digia.com>
Date: Thu, 9 Oct 2014 15:40:37 +0000 (+0200)
Subject: Fix CLoop on big-endian machines
X-Git-Tag: archive/raspbian/5.212.0_alpha2-6+rpi1~5^2^2^2^2^2^2~10
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=96d233eea60d0fa6fb3c4df84f5c66edd635d9f1;p=qtwebkit-opensource-src.git

Fix CLoop on big-endian machines

Callee and ScopeChain are JSObject pointers and saved in the 64bit
structure for JS registers. On a 32bit big-endian machine the actual
pointer is offset by the PayloadOffset of 4 bytes, but on little-endian
and 64bit architectures there is no offset.

This patch fixes four places the payloadOffset was not correctly added
on 32bit big-endian, and six places it was added on 64big big-endian
when it shouldn't.

Task-number: QTBUG-41896
Change-Id: I46b474bee9822b8040d1b7b2e8f31ce42e0adefe
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

Gbp-Pq: Name fix_cloop_on_big_endian_machines.patch
---

diff --git a/Source/JavaScriptCore/llint/LowLevelInterpreter.asm b/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
index 2b5a23c2..c4d86ee3 100644
--- a/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
+++ b/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
@@ -87,6 +87,12 @@ else
     const PayloadOffset = 0
 end
 
+if JSVALUE64
+    const JSCellPayloadOffset = 0
+else
+    const JSCellPayloadOffset = PayloadOffset
+end
+
 # Constant for reasoning about butterflies.
 const IsArray                  = 1
 const IndexingShapeMask        = 30
@@ -161,7 +167,6 @@ else
     const VectorSizeOffset = 8
 end
 
-
 # Some common utilities.
 macro crash()
     if C_LOOP
@@ -267,13 +272,13 @@ macro assertNotConstant(index)
 end
 
 macro functionForCallCodeBlockGetter(targetRegister)
-    loadp Callee[cfr], targetRegister
+    loadp Callee + JSCellPayloadOffset[cfr], targetRegister
     loadp JSFunction::m_executable[targetRegister], targetRegister
     loadp FunctionExecutable::m_codeBlockForCall[targetRegister], targetRegister
 end
 
 macro functionForConstructCodeBlockGetter(targetRegister)
-    loadp Callee[cfr], targetRegister
+    loadp Callee + JSCellPayloadOffset[cfr], targetRegister
     loadp JSFunction::m_executable[targetRegister], targetRegister
     loadp FunctionExecutable::m_codeBlockForConstruct[targetRegister], targetRegister
 end
@@ -671,7 +676,7 @@ _llint_op_resolve_global_var:
 macro resolveScopedVarBody(resolveOperations)
     # First ResolveOperation is to skip scope chain nodes
     getScope(macro(dest)
-                 loadp ScopeChain + PayloadOffset[cfr], dest
+                 loadp ScopeChain + JSCellPayloadOffset[cfr], dest
              end,
              ResolveOperation::m_scopesToSkip[resolveOperations], t1, t2)
     loadp JSVariableObject::m_registers[t1], t1 # t1 now contains the activation registers
@@ -696,7 +701,7 @@ _llint_op_resolve_scoped_var_on_top_scope:
     loadisFromInstruction(1, t3)
 
     # We know we want the top scope chain entry
-    loadp ScopeChain + PayloadOffset[cfr], t1
+    loadp ScopeChain + JSCellPayloadOffset[cfr], t1
     loadp JSVariableObject::m_registers[t1], t1 # t1 now contains the activation registers
     
     # Second ResolveOperation tells us what offset to use
@@ -718,7 +723,7 @@ _llint_op_resolve_scoped_var_with_top_scope_check:
                      loadp JSScope::m_next[t1], dest
                  jmp .done
                  .scopeChainNotCreated:
-                     loadp ScopeChain + PayloadOffset[cfr], dest
+                     loadp ScopeChain + JSCellPayloadOffset[cfr], dest
                  .done:
              end, 
              # Second ResolveOperation tells us how many more nodes to skip
@@ -773,7 +778,7 @@ _llint_op_resolve_base_to_scope:
     getResolveOperation(4, t0)
     # First ResolveOperation is to skip scope chain nodes
     getScope(macro(dest)
-                 loadp ScopeChain + PayloadOffset[cfr], dest
+                 loadp ScopeChain + JSCellPayloadOffset[cfr], dest
              end,
              ResolveOperation::m_scopesToSkip[t0], t1, t2)
     loadisFromInstruction(1, t3)
@@ -798,7 +803,7 @@ _llint_op_resolve_base_to_scope_with_top_scope_check:
                      loadp JSScope::m_next[t1], dest
                  jmp .done
                  .scopeChainNotCreated:
-                     loadp ScopeChain + PayloadOffset[cfr], dest
+                     loadp ScopeChain + JSCellPayloadOffset[cfr], dest
                  .done:
              end, 
              # Second ResolveOperation tells us how many more nodes to skip
@@ -823,7 +828,7 @@ macro interpretResolveWithBase(opcodeLength, slowPath)
     getResolveOperation(4, t0)
     btpz t0, .slowPath
 
-    loadp ScopeChain[cfr], t3
+    loadp ScopeChain + JSCellPayloadOffset[cfr], t3
     # Get the base
     loadis ResolveOperation::m_operation[t0], t2
 
@@ -845,7 +850,7 @@ macro interpretResolveWithBase(opcodeLength, slowPath)
                          loadp JSScope::m_next[t1], dest
                      jmp .done
                      .scopeChainNotCreated:
-                         loadp ScopeChain + PayloadOffset[cfr], dest
+                         loadp ScopeChain + JSCellPayloadOffset[cfr], dest
                      .done:
                  end,
                  sizeof ResolveOperation + ResolveOperation::m_scopesToSkip[t0], t1, t2)
diff --git a/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm b/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
index 89e40c7d..87aa09ea 100644
--- a/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
+++ b/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
@@ -1692,7 +1692,7 @@ _llint_op_next_pname:
     loadi 20[PC], t2
     loadi PayloadOffset[cfr, t2, 8], t2
     loadp JSPropertyNameIterator::m_jsStrings[t2], t3
-    loadi [t3, t0, 8], t3
+    loadi PayloadOffset[t3, t0, 8], t3
     addi 1, t0
     storei t0, PayloadOffset[cfr, t1, 8]
     loadi 4[PC], t1