cregit-Linux how code gets into the kernel

Release 4.14 arch/m32r/include/asm/user.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_M32R_USER_H

#define _ASM_M32R_USER_H

#include <linux/types.h>
#include <asm/ptrace.h>
#include <asm/page.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).
 *
 * 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 handy 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 sbrk'ed.  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 usp to
 *      current->start_stack, so we round each of these off in order to be
 *      able to write an integer number of pages.
 */


struct user {
	
struct pt_regs	regs;			/* entire machine state */
	
size_t		u_tsize;		/* text size (pages) */
	
size_t		u_dsize;		/* data size (pages) */
	
size_t		u_ssize;		/* stack size (pages) */
	
unsigned long	start_code;		/* text starting address */
	
unsigned long	start_data;		/* data starting address */
	
unsigned long	start_stack;		/* stack starting address */
	
long int	signal;			/* signal causing core dump */
	
unsigned long	u_ar0;			/* help gdb find registers */
	
unsigned long	magic;			/* identifies a core file */
	
char		u_comm[32];		/* user command name */
};


#define NBPG			PAGE_SIZE

#define UPAGES			1

#define HOST_TEXT_START_ADDR	(u.start_code)

#define HOST_DATA_START_ADDR	(u.start_data)

#define HOST_STACK_END_ADDR	(u.start_stack + u.u_ssize * NBPG)

#endif /* _ASM_M32R_USER_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Hirokazu Takata9696.97%133.33%
H. Peter Anvin22.02%133.33%
Greg Kroah-Hartman11.01%133.33%
Total99100.00%3100.00%
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