Changeset 7b2c2c5f for src/libcfa/concurrency/CtxSwitch-i386.S

Timestamp:

Mar 9, 2017, 3:49:30 PM (5 years ago)

Author:

Thierry Delisle <tdelisle@…>

Branches:

aaron-thesis, arm-eh, cleanup-dtors, deferred_resn, demangler, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, resolv-new, with_gc

Children:

149d297

Parents:

5222605

Message:

Fixed saving and loading of control words for i386

File:

• src/libcfa/concurrency/CtxSwitch-i386.S (modified) (3 diffs)

src/libcfa/concurrency/CtxSwitch-i386.S

@@ -52 +52 @@
         movl 4(%esp),%eax
 
+        // Save floating & SSE control words on the stack.
+
+        sub    $8,%esp
+        stmxcsr 0(%esp)         // 4 bytes
+        fnstcw  4(%esp)         // 2 bytes
+
         // Save volatile registers on the stack.
 
@@ -69 +75 @@
         // argument is now at 8 + 12 = 20(%esp)
 
-        movl 20(%esp),%eax
+        movl 28(%esp),%eax
 
         // Load new context from the "to" area.
@@ -81 +87 @@
         popl %edi
         popl %ebx
+
+        // Load floating & SSE control words from the stack.
+
+        fldcw   4(%esp)
+        ldmxcsr 0(%esp)
+        add    $8,%esp
 
         // Return to thread.