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