FreeBSD/Linux Kernel Cross Reference
sys/include/asm-alpha/user.h

     #ifndef _ALPHA_USER_H
     #define _ALPHA_USER_H
     
     #include <linux/ptrace.h>
     
     #include <asm/page.h>
     #include <asm/reg.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, NOT the osf-core).  The 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 long.
     *  data: The data segment follows next.  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 in order to be able
     *      to write an integer number of pages.
     */
    struct user {
            unsigned long   regs[EF_SIZE/8+32];     /* integer and fp regs */
            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 */
            struct regs *   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 /* _ALPHA_USER_H */

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