Changeset 10558

Timestamp:

08/24/08 23:57:40 (3 months ago)

Author:

gb

Message:

When doing ff-calls and syscalls, don't assume anything about foreign
stack alignment on entry, but force 16-byte alignment before the
call. (We're now pushing two words beyound the aligned area when
building C frames; this change just helps to bootstrap that.)

Files:

• trunk/source/lisp-kernel/x86-spentry32.s (modified) (3 diffs)

trunk/source/lisp-kernel/x86-spentry32.s

@@ -1031 +1031 @@
-        __(emms)
-        __(pop %ebp)            /* backlink */
+        __(lea 15(%esp),%edx)
+        __(andl $-16,%edx)
+        __(movl %edx,%esp)
-        __(unbox_fixnum(%arg_z,%eax))   /* syscall number */
-        __(movl $local_label(back_from_sysenter),%edx)
@@ -1084 +1087 @@
-        __(emms)
-        __(pop %ebp)            /* backlink */
+        __(lea 15(%esp),%edx)
+        __(andl $-16,%edx)
+        __(movl %edx,%esp)
-        __(unbox_fixnum(%arg_z,%eax))   /* syscall number */
-        __(pushl $local_label(back_from_syscall))
@@ -4055 +4061 @@
-        __(movl (%esp),%ebp)
-LocalLabelPrefix[]ffcall_setup:
-
+
+
+
+
-LocalLabelPrefix[]ffcall_call:
-        __(call *%eax)