1 files changed, 80 insertions, 0 deletions
diff --git a/arch/frv/include/asm/user.h b/arch/frv/include/asm/user.h
new file mode 100644
index 00000000000..82fa8fab64a
--- /dev/null
+++ b/arch/frv/include/asm/user.h
@@ -0,0 +1,80 @@
+/* user.h: FR-V core file format stuff
+ *
+ * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _ASM_USER_H
+#define _ASM_USER_H
+
+#include <asm/page.h>
+#include <asm/registers.h>
+
+/* Core file format: The core file is written in such a way that gdb
+ * can understand it and provide useful information to the user (under
+ * linux we use the 'trad-core' bfd).  There are quite a number of
+ * obstacles to being able to view the contents of the floating point
+ * registers, and until these are solved you will not be able to view
+ * the contents of them.  Actually, you can read in the core file and
+ * look at the contents of the user struct to find out what the
+ * floating point registers contain.
+ *
+ * The actual file contents are as follows:
+ * UPAGE:
+ *   1 page consisting of a user struct that tells gdb what is present
+ *   in the file.  Directly after this is a copy of the task_struct,
+ *   which is currently not used by gdb, but it may come in useful at
+ *   some point.  All of the registers are stored as part of the
+ *   upage.  The upage should always be only one page.
+ *
+ * DATA:
+ *   The data area is stored.  We use current->end_text to
+ *   current->brk to pick up all of the user variables, plus any
+ *   memory that may have been malloced.  No attempt is made to
+ *   determine if a page is demand-zero or if a page is totally
+ *   unused, we just cover the entire range.  All of the addresses are
+ *   rounded in such a way that an integral number of pages is
+ *   written.
+ *
+ * STACK:
+ *   We need the stack information in order to get a meaningful
+ *   backtrace.  We need to write the data from (esp) to
+ *   current->start_stack, so we round each of these off in order to
+ *   be able to write an integer number of pages.  The minimum core
+ *   file size is 3 pages, or 12288 bytes.
+ */
+
+/* When the kernel dumps core, it starts by dumping the user struct -
+ * this will be used by gdb to figure out where the data and stack segments
+ *  are within the file, and what virtual addresses to use.
+ */
+struct user {
+	/* We start with the registers, to mimic the way that "memory" is returned
+	 * from the ptrace(3,...) function.  */
+	struct user_context	regs;
+
+	/* The rest of this junk is to help gdb figure out what goes where */
+	unsigned long		u_tsize;	/* Text segment size (pages). */
+	unsigned long		u_dsize;	/* Data segment size (pages). */
+	unsigned long		u_ssize;	/* Stack segment size (pages). */
+	unsigned long		start_code;     /* Starting virtual address of text. */
+	unsigned long		start_stack;	/* Starting virtual address of stack area.
+						 * This is actually the bottom of the stack,
+						 * the top of the stack is always found in the
+						 * esp register.  */
+	long int		signal;		/* Signal that caused the core dump. */
+
+	unsigned long		magic;		/* To uniquely identify a core file */
+	char			u_comm[32];	/* User command that was responsible */
+};
+
+#define NBPG			PAGE_SIZE
+#define UPAGES			1
+#define HOST_TEXT_START_ADDR	(u.start_code)
+#define HOST_STACK_END_ADDR	(u.start_stack + u.u_ssize * NBPG)
+
+#endif