/* 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