1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
78 lines
3.3 KiB
C
78 lines
3.3 KiB
C
/*
|
|
* include/asm-s390/user.h
|
|
*
|
|
* S390 version
|
|
*
|
|
* Derived from "include/asm-i386/usr.h"
|
|
*/
|
|
|
|
#ifndef _S390_USER_H
|
|
#define _S390_USER_H
|
|
|
|
#include <asm/page.h>
|
|
#include <linux/ptrace.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.
|
|
*/
|
|
|
|
|
|
/*
|
|
* This is the old layout of "struct pt_regs", and
|
|
* is still the layout used by user mode (the new
|
|
* pt_regs doesn't have all registers as the kernel
|
|
* doesn't use the extra segment registers)
|
|
*/
|
|
|
|
/* 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_regs_struct regs; /* Where the registers are actually stored */
|
|
/* The rest of this junk is to help gdb figure out what goes where */
|
|
unsigned long int u_tsize; /* Text segment size (pages). */
|
|
unsigned long int u_dsize; /* Data segment size (pages). */
|
|
unsigned long int 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. */
|
|
struct user_regs_struct *u_ar0;
|
|
/* Used by gdb to help find the values for */
|
|
/* the registers. */
|
|
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 /* _S390_USER_H */
|