Fri May 2 12:43:46 1997 Thomas Bushnell, n/BSG <thomas@gnu.ai.mit.edu>

	* Makefile.in (enable_kdb): New variable.
	(clib-routines): If enable_kdb, then add strstr.
	* i386/i386/_setjmp.S: New file, from UK22 libmach.
	* i386/Files: Add i386/i386/_setjmp.S.
	* i386/Makefrag (objfiles): Add _setjmp.o if enable_kdb.

3 files changed, 69 insertions, 0 deletions

diff --git a/i386/Files b/i386/Files
index a55e410..a8e85f2 100644
--- a/i386/Files
+++ b/i386/Files
@@ -54,6 +54,7 @@ i386/dos/i16/i16_vcpi.c
 i386/dos/i16/i16_xms.c
 i386/dos/i16/idt.h
 i386/dos/i16/phys_mem_sources.h
+i386/i368/_setjmp.S
 i386/i386/ast.h
 i386/i386/ast_check.c
 i386/i386/ast_types.h
diff --git a/i386/Makefrag b/i386/Makefrag
index 979365f..0171130 100644
--- a/i386/Makefrag
+++ b/i386/Makefrag
@@ -46,6 +46,11 @@ objfiles += fpe.o
 # Mig-generated
 objfiles += mach_i386_server.o
 
+# This file is only needed for KDB support.
+ifeq ($(enable_kdb),yes)
+objfiles += _setjmp.o
+endif
+
 ### Linux device drivers (make this Better, Please)
 
 linux-gen-files = $(addprefix linux_,$(linux-gen-names))
diff --git a/i386/i386/_setjmp.S b/i386/i386/_setjmp.S
new file mode 100644
index 0000000..efabeb6
--- /dev/null
+++ b/i386/i386/_setjmp.S
@@ -0,0 +1,63 @@
+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * C library -- _setjmp, _longjmp
+ *
+ *	_longjmp(a,v)
+ * will generate a "return(v)" from
+ * the last call to
+ *	_setjmp(a)
+ * by restoring registers from the stack,
+ * The previous signal state is NOT restored.
+ *
+ */
+
+#include <mach/machine/asm.h>
+
+ENTRY(_setjmp)
+	movl	4(%esp),%ecx		/* fetch buffer */
+	movl	%ebx,0(%ecx)
+	movl	%esi,4(%ecx)
+	movl	%edi,8(%ecx)
+	movl	%ebp,12(%ecx)		/* save frame pointer of caller */
+	popl	%edx
+	movl	%esp,16(%ecx)		/* save stack pointer of caller */
+	movl	%edx,20(%ecx)		/* save pc of caller */
+	xorl	%eax,%eax
+        jmp     *%edx
+
+ENTRY(_longjmp)
+	movl	8(%esp),%eax		/* return(v) */
+	movl	4(%esp),%ecx		/* fetch buffer */
+	movl	0(%ecx),%ebx
+	movl	4(%ecx),%esi
+	movl	8(%ecx),%edi
+	movl	12(%ecx),%ebp
+	movl	16(%ecx),%esp
+	orl	%eax,%eax
+	jnz	0f
+	incl	%eax
+0:	jmp	*20(%ecx)		/* done, return.... */