Changeset b539f54 in mainline

Timestamp:

2010-07-12T16:33:06Z (14 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

8078180

Parents:

efbd094

Message:

Do not clobber preserved register EBX.

File:

• kernel/arch/ia32/src/asm.S (modified) (3 diffs)

kernel/arch/ia32/src/asm.S

@@ -389 +389 @@
          * Save the selector registers.
          */
-        movl %gs, %eax
-        movl %fs, %ebx
+        movl %gs, %ecx
+        movl %fs, %edx
+
+        movl %ecx, ISTATE_OFFSET_GS(%esp)
+        movl %edx, ISTATE_OFFSET_FS(%esp)
+
         movl %es, %ecx
         movl %ds, %edx
         
-        movl %eax, ISTATE_OFFSET_GS(%esp)
-        movl %ebx, ISTATE_OFFSET_FS(%esp)
         movl %ecx, ISTATE_OFFSET_ES(%esp)
         movl %edx, ISTATE_OFFSET_DS(%esp)
@@ -434 +436 @@
                  * Restore the selector registers.
                  */
-                movl ISTATE_OFFSET_GS(%esp), %eax
-                movl ISTATE_OFFSET_FS(%esp), %ebx
+                movl ISTATE_OFFSET_GS(%esp), %ecx
+                movl ISTATE_OFFSET_FS(%esp), %edx
+
+                movl %ecx, %gs
+                movl %edx, %fs
+
                 movl ISTATE_OFFSET_ES(%esp), %ecx
                 movl ISTATE_OFFSET_DS(%esp), %edx
                 
-                movl %eax, %gs
-                movl %ebx, %fs
                 movl %ecx, %es
                 movl %edx, %ds
@@ -447 +451 @@
                  * Restore the scratch registers and the preserved
                  * registers the handler cloberred itself
-                 * (i.e. EBX and EBP).
+                 * (i.e. EBP).
                  */
                 movl ISTATE_OFFSET_EAX(%esp), %eax
-                movl ISTATE_OFFSET_EBX(%esp), %ebx
                 movl ISTATE_OFFSET_ECX(%esp), %ecx
                 movl ISTATE_OFFSET_EDX(%esp), %edx