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#ifndef _I386_USER_H
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#define _I386_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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/*
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 * Pentium III FXSR, SSE support
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 *      Gareth Hughes <gareth@valinux.com>, May 2000
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 *
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 * Provide support for the GDB 5.0+ PTRACE_{GET|SET}FPXREGS requests for
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 * interacting with the FXSR-format floating point environment.  Floating
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 * point data can be accessed in the regular format in the usual manner,
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 * and both the standard and SIMD floating point data can be accessed via
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 * the new ptrace requests.  In either case, changes to the FPU environment
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 * will be reflected in the task's state as expected.
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 */
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struct user_i387_struct {
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        long    cwd;
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        long    swd;
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        long    twd;
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        long    fip;
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        long    fcs;
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        long    foo;
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        long    fos;
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        long    st_space[20];   /* 8*10 bytes for each FP-reg = 80 bytes */
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};
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struct user_fxsr_struct {
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        unsigned short  cwd;
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        unsigned short  swd;
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        unsigned short  twd;
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        unsigned short  fop;
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        long    fip;
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        long    fcs;
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        long    foo;
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        long    fos;
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        long    mxcsr;
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        long    reserved;
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        long    st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
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        long    xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
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        long    padding[56];
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};
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/*
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 * This is the old layout of "struct pt_regs", and
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 * is still the layout used by user mode (the new
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 * pt_regs doesn't have all registers as the kernel
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 * doesn't use the extra segment registers)
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 */
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struct user_regs_struct {
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        long ebx, ecx, edx, esi, edi, ebp, eax;
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        unsigned short ds, __ds, es, __es;
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        unsigned short fs, __fs, gs, __gs;
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        long orig_eax, eip;
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        unsigned short cs, __cs;
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        long eflags, esp;
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        unsigned short ss, __ss;
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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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  int u_fpvalid;                /* True if math co-processor being used. */
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                                /* for this mess. Not yet used. */
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  struct user_i387_struct i387; /* Math Co-processor registers. */
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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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  struct user_pt_regs * u_ar0;  /* Used by gdb to help find the values for */
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                                /* the registers. */
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  struct user_i387_struct* u_fpstate;   /* Math Co-processor pointer. */
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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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  int u_debugreg[8];
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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 /* _I386_USER_H */