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ptrace.h

#ifndef _ASM_IA64_PTRACE_H
#define _ASM_IA64_PTRACE_H

/*
 * Copyright (C) 1998-2004 Hewlett-Packard Co
 *    David Mosberger-Tang <davidm@hpl.hp.com>
 *    Stephane Eranian <eranian@hpl.hp.com>
 * Copyright (C) 2003 Intel Co
 *    Suresh Siddha <suresh.b.siddha@intel.com>
 *    Fenghua Yu <fenghua.yu@intel.com>
 *    Arun Sharma <arun.sharma@intel.com>
 *
 * 12/07/98 S. Eranian  added pt_regs & switch_stack
 * 12/21/98 D. Mosberger      updated to match latest code
 *  6/17/99 D. Mosberger      added second unat member to "struct switch_stack"
 *
 */
/*
 * When a user process is blocked, its state looks as follows:
 *
 *            +----------------------+    -------     IA64_STK_OFFSET
 *                |                      |       ^
 *            | struct pt_regs       |     |
 *          |                      |       |
 *            +----------------------+     |
 *          |                      |       |
 *                |        memory stack        |       |
 *          |     (growing downwards)  |   |
 *          //.....................//      |
 *                             |
 *          //.....................//      |
 *          |                      |       |
 *            +----------------------+     |
 *            | struct switch_stack  |     |
 *          |                      |       |
 *          +----------------------+       |
 *          |                      |       |
 *          //.....................//      |
 *                             |
 *          //.....................//      |
 *          |                      |       |
 *          |      register stack        |       |
 *          |     (growing upwards)    |   |
 *            |                    |       |
 *          +----------------------+       |  ---     IA64_RBS_OFFSET
 *            |  struct thread_info  |     |  ^
 *          +----------------------+       |  |
 *          |                      |       |  |
 *            |  struct task_struct  |     |  |
 * current -> |                    |   |  |
 *          +----------------------+ -------
 *
 * Note that ar.ec is not saved explicitly in pt_reg or switch_stack.
 * This is because ar.ec is saved as part of ar.pfs.
 */


#include <asm/fpu.h>

#ifdef __KERNEL__
#ifndef ASM_OFFSETS_C
#include <asm/asm-offsets.h>
#endif

/*
 * Base-2 logarithm of number of pages to allocate per task structure
 * (including register backing store and memory stack):
 */
#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
# define KERNEL_STACK_SIZE_ORDER          3
#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
# define KERNEL_STACK_SIZE_ORDER          2
#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
# define KERNEL_STACK_SIZE_ORDER          1
#else
# define KERNEL_STACK_SIZE_ORDER          0
#endif

#define IA64_RBS_OFFSET             ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 31) & ~31)
#define IA64_STK_OFFSET             ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE)

#define KERNEL_STACK_SIZE           IA64_STK_OFFSET

#endif /* __KERNEL__ */

#ifndef __ASSEMBLY__

/*
 * This struct defines the way the registers are saved on system
 * calls.
 *
 * We don't save all floating point register because the kernel
 * is compiled to use only a very small subset, so the other are
 * untouched.
 *
 * THIS STRUCTURE MUST BE A MULTIPLE 16-BYTE IN SIZE
 * (because the memory stack pointer MUST ALWAYS be aligned this way)
 *
 */
struct pt_regs {
      /* The following registers are saved by SAVE_MIN: */
      unsigned long b6;       /* scratch */
      unsigned long b7;       /* scratch */

      unsigned long ar_csd;           /* used by cmp8xchg16 (scratch) */
      unsigned long ar_ssd;           /* reserved for future use (scratch) */

      unsigned long r8;       /* scratch (return value register 0) */
      unsigned long r9;       /* scratch (return value register 1) */
      unsigned long r10;            /* scratch (return value register 2) */
      unsigned long r11;            /* scratch (return value register 3) */

      unsigned long cr_ipsr;        /* interrupted task's psr */
      unsigned long cr_iip;         /* interrupted task's instruction pointer */
      /*
       * interrupted task's function state; if bit 63 is cleared, it
       * contains syscall's ar.pfs.pfm:
       */
      unsigned long cr_ifs;

      unsigned long ar_unat;        /* interrupted task's NaT register (preserved) */
      unsigned long ar_pfs;         /* prev function state  */
      unsigned long ar_rsc;         /* RSE configuration */
      /* The following two are valid only if cr_ipsr.cpl > 0 || ti->flags & _TIF_MCA_INIT */
      unsigned long ar_rnat;        /* RSE NaT */
      unsigned long ar_bspstore;    /* RSE bspstore */

      unsigned long pr;       /* 64 predicate registers (1 bit each) */
      unsigned long b0;       /* return pointer (bp) */
      unsigned long loadrs;         /* size of dirty partition << 16 */

      unsigned long r1;       /* the gp pointer */
      unsigned long r12;            /* interrupted task's memory stack pointer */
      unsigned long r13;            /* thread pointer */

      unsigned long ar_fpsr;        /* floating point status (preserved) */
      unsigned long r15;            /* scratch */

      /* The remaining registers are NOT saved for system calls.  */

      unsigned long r14;            /* scratch */
      unsigned long r2;       /* scratch */
      unsigned long r3;       /* scratch */

      /* The following registers are saved by SAVE_REST: */
      unsigned long r16;            /* scratch */
      unsigned long r17;            /* scratch */
      unsigned long r18;            /* scratch */
      unsigned long r19;            /* scratch */
      unsigned long r20;            /* scratch */
      unsigned long r21;            /* scratch */
      unsigned long r22;            /* scratch */
      unsigned long r23;            /* scratch */
      unsigned long r24;            /* scratch */
      unsigned long r25;            /* scratch */
      unsigned long r26;            /* scratch */
      unsigned long r27;            /* scratch */
      unsigned long r28;            /* scratch */
      unsigned long r29;            /* scratch */
      unsigned long r30;            /* scratch */
      unsigned long r31;            /* scratch */

      unsigned long ar_ccv;         /* compare/exchange value (scratch) */

      /*
       * Floating point registers that the kernel considers scratch:
       */
      struct ia64_fpreg f6;         /* scratch */
      struct ia64_fpreg f7;         /* scratch */
      struct ia64_fpreg f8;         /* scratch */
      struct ia64_fpreg f9;         /* scratch */
      struct ia64_fpreg f10;        /* scratch */
      struct ia64_fpreg f11;        /* scratch */
};

/*
 * This structure contains the addition registers that need to
 * preserved across a context switch.  This generally consists of
 * "preserved" registers.
 */
struct switch_stack {
      unsigned long caller_unat;    /* user NaT collection register (preserved) */
      unsigned long ar_fpsr;        /* floating-point status register */

      struct ia64_fpreg f2;         /* preserved */
      struct ia64_fpreg f3;         /* preserved */
      struct ia64_fpreg f4;         /* preserved */
      struct ia64_fpreg f5;         /* preserved */

      struct ia64_fpreg f12;        /* scratch, but untouched by kernel */
      struct ia64_fpreg f13;        /* scratch, but untouched by kernel */
      struct ia64_fpreg f14;        /* scratch, but untouched by kernel */
      struct ia64_fpreg f15;        /* scratch, but untouched by kernel */
      struct ia64_fpreg f16;        /* preserved */
      struct ia64_fpreg f17;        /* preserved */
      struct ia64_fpreg f18;        /* preserved */
      struct ia64_fpreg f19;        /* preserved */
      struct ia64_fpreg f20;        /* preserved */
      struct ia64_fpreg f21;        /* preserved */
      struct ia64_fpreg f22;        /* preserved */
      struct ia64_fpreg f23;        /* preserved */
      struct ia64_fpreg f24;        /* preserved */
      struct ia64_fpreg f25;        /* preserved */
      struct ia64_fpreg f26;        /* preserved */
      struct ia64_fpreg f27;        /* preserved */
      struct ia64_fpreg f28;        /* preserved */
      struct ia64_fpreg f29;        /* preserved */
      struct ia64_fpreg f30;        /* preserved */
      struct ia64_fpreg f31;        /* preserved */

      unsigned long r4;       /* preserved */
      unsigned long r5;       /* preserved */
      unsigned long r6;       /* preserved */
      unsigned long r7;       /* preserved */

      unsigned long b0;       /* so we can force a direct return in copy_thread */
      unsigned long b1;
      unsigned long b2;
      unsigned long b3;
      unsigned long b4;
      unsigned long b5;

      unsigned long ar_pfs;         /* previous function state */
      unsigned long ar_lc;          /* loop counter (preserved) */
      unsigned long ar_unat;        /* NaT bits for r4-r7 */
      unsigned long ar_rnat;        /* RSE NaT collection register */
      unsigned long ar_bspstore;    /* RSE dirty base (preserved) */
      unsigned long pr;       /* 64 predicate registers (1 bit each) */
};

#ifdef __KERNEL__

#include <asm/current.h>
#include <asm/page.h>

/*
 * We use the ia64_psr(regs)->ri to determine which of the three
 * instructions in bundle (16 bytes) took the sample. Generate
 * the canonical representation by adding to instruction pointer.
 */
# define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)

static inline unsigned long user_stack_pointer(struct pt_regs *regs)
{
      /* FIXME: should this be bspstore + nr_dirty regs? */
      return regs->ar_bspstore;
}

#define regs_return_value(regs) ((regs)->r8)

/* Conserve space in histogram by encoding slot bits in address
 * bits 2 and 3 rather than bits 0 and 1.
 */
#define profile_pc(regs)                                    \
({                                                    \
      unsigned long __ip = instruction_pointer(regs);             \
      (__ip & ~3UL) + ((__ip & 3UL) << 2);                        \
})

  /* given a pointer to a task_struct, return the user's pt_regs */
# define task_pt_regs(t)            (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
# define ia64_psr(regs)             ((struct ia64_psr *) &(regs)->cr_ipsr)
# define user_mode(regs)            (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
# define user_stack(task,regs)      ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs))
# define fsys_mode(task,regs)                         \
  ({                                            \
        struct task_struct *_task = (task);                 \
        struct pt_regs *_regs = (regs);               \
        !user_mode(_regs) && user_stack(_task, _regs);      \
  })

  /*
   * System call handlers that, upon successful completion, need to return a negative value
   * should call force_successful_syscall_return() right before returning.  On architectures
   * where the syscall convention provides for a separate error flag (e.g., alpha, ia64,
   * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error
   * flag will not get set.  On architectures which do not support a separate error flag,
   * the macro is a no-op and the spurious error condition needs to be filtered out by some
   * other means (e.g., in user-level, by passing an extra argument to the syscall handler,
   * or something along those lines).
   *
   * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall.
   */
# define force_successful_syscall_return()      (task_pt_regs(current)->r8 = 0)

  struct task_struct;               /* forward decl */
  struct unw_frame_info;            /* forward decl */

  extern void show_regs (struct pt_regs *);
  extern void ia64_do_show_stack (struct unw_frame_info *, void *);
  extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,
                                    unsigned long *);
  extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,
                   unsigned long, long *);
  extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,
                   unsigned long, long);
  extern void ia64_flush_fph (struct task_struct *);
  extern void ia64_sync_fph (struct task_struct *);
  extern void ia64_sync_krbs(void);
  extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,
                          unsigned long, unsigned long);

  /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */
  extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);
  /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */
  extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);

  extern void ia64_increment_ip (struct pt_regs *pt);
  extern void ia64_decrement_ip (struct pt_regs *pt);

  extern void ia64_ptrace_stop(void);
  #define arch_ptrace_stop(code, info) \
      ia64_ptrace_stop()
  #define arch_ptrace_stop_needed(code, info) \
      (!test_thread_flag(TIF_RESTORE_RSE))

  extern void ptrace_attach_sync_user_rbs (struct task_struct *);
  #define arch_ptrace_attach(child) \
      ptrace_attach_sync_user_rbs(child)

  #define arch_has_single_step()  (1)
  #define arch_has_block_step()   (1)

#endif /* !__KERNEL__ */

/* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */
00327 struct pt_all_user_regs {
      unsigned long nat;
      unsigned long cr_iip;
      unsigned long cfm;
      unsigned long cr_ipsr;
      unsigned long pr;

      unsigned long gr[32];
      unsigned long br[8];
      unsigned long ar[128];
      struct ia64_fpreg fr[128];
};

#endif /* !__ASSEMBLY__ */

/* indices to application-registers array in pt_all_user_regs */
#define PT_AUR_RSC      16
#define PT_AUR_BSP      17
#define PT_AUR_BSPSTORE 18
#define PT_AUR_RNAT     19
#define PT_AUR_CCV      32
#define PT_AUR_UNAT     36
#define PT_AUR_FPSR     40
#define PT_AUR_PFS      64
#define PT_AUR_LC 65
#define PT_AUR_EC 66

/*
 * The numbers chosen here are somewhat arbitrary but absolutely MUST
 * not overlap with any of the number assigned in <linux/ptrace.h>.
 */
#define PTRACE_SINGLEBLOCK    12    /* resume execution until next branch */
#define PTRACE_OLD_GETSIGINFO 13    /* (replaced by PTRACE_GETSIGINFO in <linux/ptrace.h>)  */
#define PTRACE_OLD_SETSIGINFO 14    /* (replaced by PTRACE_SETSIGINFO in <linux/ptrace.h>)  */
#define PTRACE_GETREGS        18    /* get all registers (pt_all_user_regs) in one shot */
#define PTRACE_SETREGS        19    /* set all registers (pt_all_user_regs) in one shot */

#define PTRACE_OLDSETOPTIONS  21

#endif /* _ASM_IA64_PTRACE_H */

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