Initial Revision

1 files changed, 88 insertions, 0 deletions

diff --git a/serverboot/exec.c b/serverboot/exec.c
new file mode 100644
index 00000000..5b5feedc
--- /dev/null
+++ b/serverboot/exec.c
@@ -0,0 +1,88 @@
+/* 
+ * Mach Operating System
+ * Copyright (c) 1993-1989 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.
+ */
+/*
+ * i386-specific routines for loading a.out files.
+ */
+
+#include <mach.h>
+#include <mach/machine/vm_param.h>
+#include <mach/machine/eflags.h>
+#include <mach/exec/exec.h>
+
+#include <file_io.h>
+
+/*
+ *	Machine-dependent portions of execve() for the i386.
+ */
+
+#define	STACK_SIZE	(64*1024)
+
+char *set_regs(
+	mach_port_t	user_task,
+	mach_port_t	user_thread,
+	struct exec_info *info,
+	int		arg_size)
+{
+	vm_offset_t	stack_start;
+	vm_offset_t	stack_end;
+	struct i386_thread_state	regs;
+	unsigned int		reg_size;
+
+	/*
+	 * Add space for 5 ints to arguments, for
+	 * PS program. XXX
+	 */
+	arg_size += 5 * sizeof(int);
+
+	/*
+	 * Allocate stack.
+	 */
+	stack_end = VM_MAX_ADDRESS;
+	stack_start = VM_MAX_ADDRESS - STACK_SIZE;
+	(void)vm_allocate(user_task,
+			  &stack_start,
+			  (vm_size_t)(stack_end - stack_start),
+			  FALSE);
+
+	reg_size = i386_THREAD_STATE_COUNT;
+	(void)thread_get_state(user_thread,
+				i386_THREAD_STATE,
+				(thread_state_t)&regs,
+				&reg_size);
+
+	regs.eip = info->entry;
+	regs.uesp = (int)((stack_end - arg_size) & ~(sizeof(int)-1));
+
+        /* regs.efl |=  EFL_TF;  trace flag*/
+
+	(void)thread_set_state(user_thread,
+				i386_THREAD_STATE,
+				(thread_state_t)&regs,
+				reg_size);
+
+	return (char *)regs.uesp;
+}
+