Libc-391.5.18.tar.gz

[apple/libc.git] / i386 / sys / _setjmp.s

diff --git a/i386/sys/_setjmp.s b/i386/sys/_setjmp.s
index bbec3f80f53b341768bbb52170886837caf18a54..0d355c73d5b9463f527db2a8be3449299833fc8f 100644 (file)
--- a/i386/sys/_setjmp.s
+++ b/i386/sys/_setjmp.s
@@ -3,19 +3,20 @@
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_LICENSE_HEADER_START@
  * 

- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.

  * 
  * 

- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER

  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.

  * 
  * @APPLE_LICENSE_HEADER_END@
  */
  * 
  * @APPLE_LICENSE_HEADER_END@
  */


@@ -41,9 +42,11 @@
 
 #include <architecture/i386/asm_help.h>
 
 
 #include <architecture/i386/asm_help.h>
 

-#define JB_ONSTACK      0
+// The FP control word is actually two bytes, but there's no harm in
+// using four bytes for it and keeping the struct aligned.
+#define JB_FPCW         0

 #define JB_MASK         4
 #define JB_MASK         4

-#define JB_EAX          8
+#define JB_MXCSR        8

 #define JB_EBX          12
 #define JB_ECX          16
 #define JB_EDX          20
 #define JB_EBX          12
 #define JB_ECX          16
 #define JB_EDX          20


@@ -60,11 +63,14 @@
 #define JB_FS           64
 #define JB_GS           68
 
 #define JB_FS           64
 #define JB_GS           68
 

+#define SAVE_SEG_REGS  1

 
 LEAF(__setjmp, 0)
         movl    4(%esp), %ecx           // jmp_buf (struct sigcontext *)
 
 
 LEAF(__setjmp, 0)
         movl    4(%esp), %ecx           // jmp_buf (struct sigcontext *)
 

-        // now build sigcontext
+        // Build the jmp_buf
+        fnstcw  JB_FPCW(%ecx)                  // Save the FP control word
+        stmxcsr JB_MXCSR(%ecx)                 // Save the MXCSR

         movl    %ebx, JB_EBX(%ecx)
         movl    %edi, JB_EDI(%ecx)
         movl    %esi, JB_ESI(%ecx)
         movl    %ebx, JB_EBX(%ecx)
         movl    %edi, JB_EDI(%ecx)
         movl    %esi, JB_ESI(%ecx)


@@ -99,13 +105,9 @@ LEAF(__setjmp, 0)
 
 
 LEAF(__longjmp, 0)
 
 
 LEAF(__longjmp, 0)

-       subl    $2,%esp
-       fnstcw  (%esp)                  // save FP control word

        fninit                          // reset FP coprocessor
        fninit                          // reset FP coprocessor

-       fldcw   (%esp)                  // restore FP control word
-       addl    $2,%esp

 
 

-        movl    4(%esp), %ecx           // jmp_buf (struct sigcontext *)
+       movl    4(%esp), %ecx           // jmp_buf (struct sigcontext *)

        movl    8(%esp), %eax           // return value
        testl   %eax, %eax
        jnz 1f
        movl    8(%esp), %eax           // return value
        testl   %eax, %eax
        jnz 1f


@@ -117,11 +119,13 @@ LEAF(__longjmp, 0)
        movl    JB_EDI(%ecx), %edi
        movl    JB_EBP(%ecx), %ebp
        movl    JB_ESP(%ecx), %esp
        movl    JB_EDI(%ecx), %edi
        movl    JB_EBP(%ecx), %ebp
        movl    JB_ESP(%ecx), %esp

+       fldcw   JB_FPCW(%ecx)                   // Restore FP control word
+       ldmxcsr JB_MXCSR(%ecx)                  // Restore the MXCSR

 
 #if SAVE_SEG_REGS
        // segment registers
        mov     JB_SS(%ecx), %ss
 
 #if SAVE_SEG_REGS
        // segment registers
        mov     JB_SS(%ecx), %ss

-       mov     JB_CS(%ecx), %cs
+       // mov  JB_CS(%ecx), %cs                // can't set cs?

        mov     JB_DS(%ecx), %ds
        mov     JB_ES(%ecx), %es
        mov     JB_FS(%ecx), %fs
        mov     JB_DS(%ecx), %ds
        mov     JB_ES(%ecx), %es
        mov     JB_FS(%ecx), %fs