1 #ifndef __ASM_GENERIC_USER_H !! 1 #ifdef __KERNEL__
2 #define __ASM_GENERIC_USER_H !! 2 #ifndef _PPC_USER_H
>> 3 #define _PPC_USER_H
>> 4
>> 5 /* Adapted from <asm-alpha/user.h> */
>> 6
>> 7 #include <linux/ptrace.h>
>> 8 #include <asm/page.h>
>> 9
3 /* 10 /*
4 * This file may define a 'struct user' struct !! 11 * Core file format: The core file is written in such a way that gdb
5 * used for a.out files, which are not support !! 12 * can understand it and provide useful information to the user (under
>> 13 * linux we use the `trad-core' bfd, NOT the osf-core). The file contents
>> 14 * are as follows:
>> 15 *
>> 16 * upage: 1 page consisting of a user struct that tells gdb
>> 17 * what is present in the file. Directly after this is a
>> 18 * copy of the task_struct, which is currently not used by gdb,
>> 19 * but it may come in handy at some point. All of the registers
>> 20 * are stored as part of the upage. The upage should always be
>> 21 * only one page long.
>> 22 * data: The data segment follows next. We use current->end_text to
>> 23 * current->brk to pick up all of the user variables, plus any memory
>> 24 * that may have been sbrk'ed. No attempt is made to determine if a
>> 25 * page is demand-zero or if a page is totally unused, we just cover
>> 26 * the entire range. All of the addresses are rounded in such a way
>> 27 * that an integral number of pages is written.
>> 28 * stack: We need the stack information in order to get a meaningful
>> 29 * backtrace. We need to write the data from usp to
>> 30 * current->start_stack, so we round each of these in order to be able
>> 31 * to write an integer number of pages.
6 */ 32 */
>> 33 struct user {
>> 34 struct pt_regs regs; /* entire machine state */
>> 35 size_t u_tsize; /* text size (pages) */
>> 36 size_t u_dsize; /* data size (pages) */
>> 37 size_t u_ssize; /* stack size (pages) */
>> 38 unsigned long start_code; /* text starting address */
>> 39 unsigned long start_data; /* data starting address */
>> 40 unsigned long start_stack; /* stack starting address */
>> 41 long int signal; /* signal causing core dump */
>> 42 struct regs * u_ar0; /* help gdb find registers */
>> 43 unsigned long magic; /* identifies a core file */
>> 44 char u_comm[32]; /* user command name */
>> 45 };
>> 46
>> 47 #define NBPG PAGE_SIZE
>> 48 #define UPAGES 1
>> 49 #define HOST_TEXT_START_ADDR (u.start_code)
>> 50 #define HOST_DATA_START_ADDR (u.start_data)
>> 51 #define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
7 52
8 #endif /* __ASM_GENERIC_USER_H */ !! 53 #endif /* _PPC_USER_H */
>> 54 #endif /* __KERNEL__ */
9 55
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