Changes in libcfa/src/concurrency/CtxSwitch-i386.S [b78129a:bf71cfd]

File:

• libcfa/src/concurrency/CtxSwitch-i386.S (modified) (5 diffs)

libcfa/src/concurrency/CtxSwitch-i386.S

@@ -41 +41 @@
 #define PC_OFFSET       ( 2 * PTR_BYTE )
 
-        .text
+.text
         .align 2
-        .globl CtxSwitch
-        .type  CtxSwitch, @function
+.globl  CtxSwitch
 CtxSwitch:
 
@@ -51 +50 @@
 
         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.
@@ -62 +67 @@
         movl %esp,SP_OFFSET(%eax)
         movl %ebp,FP_OFFSET(%eax)
+//      movl 4(%ebp),%ebx       // save previous eip for debugger
+//      movl %ebx,PC_OFFSET(%eax)
 
         // Copy the "to" context argument from the stack to register eax
@@ -67 +74 @@
         // argument is now at 8 + 12 = 20(%esp)
 
-        movl 20(%esp),%eax
+        movl 28(%esp),%eax
 
         // Load new context from the "to" area.
@@ -80 +87 @@
         popl %ebx
 
+        // Load floating & SSE control words from the stack.
+
+        fldcw   4(%esp)
+        ldmxcsr 0(%esp)
+        add    $8,%esp
+
         // Return to thread.
 
         ret
-        .size  CtxSwitch, .-CtxSwitch
 
 // Local Variables: //