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struct user.u_ar0 is defined to contain a pointer offset on all architectures in which it is defined (all architectures which define an a.out format except SPARC.) However, it has a pointer type in the headers, which is pointless -- <asm/user.h> is not exported to userspace, and it just makes the code messy. Redefine the field as "unsigned long" (which is the same size as a pointer on all Linux architectures) and change the setting code to user offsetof() instead of hand-coded arithmetic. Cc: Linux Arch Mailing List <linux-arch@vger.kernel.org> Cc: Bryan Wu <bryan.wu@analog.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Lennert Buytenhek <kernel@wantstofly.org> Cc: Håvard Skinnemoen <hskinnemoen@atmel.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Tony Luck <tony.luck@intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
58 lines
2.3 KiB
C
58 lines
2.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 1995, 1996, 1999 by Ralf Baechle
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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/reg.h>
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/*
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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, NOT the irix-core). The file
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* contents are as follows:
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*
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* upage: 1 page consisting of a user struct that tells gdb
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* what is present in the file. Directly after this is a
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* copy of the task_struct, which is currently not used by gdb,
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* but it may come in handy at some point. All of the registers
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* are stored as part of the upage. The upage should always be
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* only one page long.
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* data: The data segment follows next. We use current->end_text to
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* current->brk to pick up all of the user variables, plus any memory
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* that may have been sbrk'ed. No attempt is made to determine if a
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* page is demand-zero or if a page is totally unused, we just cover
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* the entire range. All of the addresses are rounded in such a way
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* that an integral number of pages is written.
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* stack: We need the stack information in order to get a meaningful
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* backtrace. We need to write the data from usp to
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* current->start_stack, so we round each of these in order to be able
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* to write an integer number of pages.
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*/
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struct user {
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unsigned long regs[EF_SIZE / /* integer and fp regs */
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sizeof(unsigned long) + 64];
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size_t u_tsize; /* text size (pages) */
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size_t u_dsize; /* data size (pages) */
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size_t u_ssize; /* stack size (pages) */
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unsigned long start_code; /* text starting address */
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unsigned long start_data; /* data starting address */
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unsigned long start_stack; /* stack starting address */
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long int signal; /* signal causing core dump */
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unsigned long u_ar0; /* help gdb find registers */
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unsigned long magic; /* identifies a core file */
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char u_comm[32]; /* user command name */
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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_DATA_START_ADDR (u.start_data)
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#define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
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#endif /* _ASM_USER_H */
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