![H. Peter Anvin](/assets/img/avatar_default.png)
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>
76 lines
3.3 KiB
C
76 lines
3.3 KiB
C
#ifndef _H8300_USER_H
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#define _H8300_USER_H
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#include <asm/page.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 the
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contents of them. Actually, you can read in the core file and look at
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the contents of the user struct to find out what the floating point
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registers contain.
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The actual file contents are as follows:
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UPAGE: 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, which
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is currently not used by gdb, but it may come in useful at some point.
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All of the registers are stored as part of the upage. The upage should
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always be only one page.
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DATA: 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 memory
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that may have been malloced. No attempt is made to determine if a page
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is demand-zero or if a page is totally unused, we just cover the entire
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range. All of the addresses are rounded in such a way that an integral
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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 (esp) to
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current->start_stack, so we round each of these off in order to be able
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to write an integer number of pages.
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The minimum core file size is 3 pages, or 12288 bytes.
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*/
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/* This is the old layout of "struct pt_regs" as of Linux 1.x, and
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is still the layout used by user (the new pt_regs doesn't have
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all registers). */
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struct user_regs_struct {
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long er1,er2,er3,er4,er5,er6;
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long er0;
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long usp;
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long orig_er0;
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short ccr;
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long pc;
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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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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_regs_struct regs; /* Where the registers are actually stored */
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/* ptrace does not yet supply these. Someday.... */
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/* The rest of this junk is to help gdb figure out what goes where */
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unsigned long int u_tsize; /* Text segment size (pages). */
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unsigned long int u_dsize; /* Data segment size (pages). */
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unsigned long int 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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int reserved; /* No longer used */
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unsigned long u_ar0; /* Used by gdb to help find the values for */
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/* the registers. */
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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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