linux-old/include/asm-ia64/ptrace.h
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   1#ifndef _ASM_IA64_PTRACE_H
   2#define _ASM_IA64_PTRACE_H
   3
   4/*
   5 * Copyright (C) 1998-2001 Hewlett-Packard Co
   6 * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
   7 * Copyright (C) 1998, 1999 Stephane Eranian <eranian@hpl.hp.com>
   8 *
   9 * 12/07/98     S. Eranian      added pt_regs & switch_stack
  10 * 12/21/98     D. Mosberger    updated to match latest code
  11 *  6/17/99     D. Mosberger    added second unat member to "struct switch_stack"
  12 *
  13 */
  14/*
  15 * When a user process is blocked, its state looks as follows:
  16 *
  17 *            +----------------------+  ------- IA64_STK_OFFSET
  18 *            |                      |   ^
  19 *            | struct pt_regs       |   |
  20 *            |                      |   |
  21 *            +----------------------+   |
  22 *            |                      |   |
  23 *            |    memory stack      |   |
  24 *            | (growing downwards)  |   |
  25 *            //.....................//  |
  26 *                                       |
  27 *            //.....................//  |
  28 *            |                      |   |
  29 *            +----------------------+   |
  30 *            | struct switch_stack  |   |
  31 *            |                      |   |
  32 *            +----------------------+   |
  33 *            |                      |   |
  34 *            //.....................//  |
  35 *                                       |
  36 *            //.....................//  |
  37 *            |                      |   |
  38 *            |  register stack      |   |
  39 *            | (growing upwards)    |   |
  40 *            |                      |   |
  41 *            +----------------------+   |  --- IA64_RBS_OFFSET
  42 *            |                      |   |  ^
  43 *            |  struct task_struct  |   |  |
  44 * current -> |                      |   |  |
  45 *            +----------------------+ -------
  46 *
  47 * Note that ar.ec is not saved explicitly in pt_reg or switch_stack.
  48 * This is because ar.ec is saved as part of ar.pfs.
  49 */
  50
  51#include <linux/config.h>
  52
  53#include <asm/fpu.h>
  54#include <asm/offsets.h>
  55
  56/*
  57 * Base-2 logarithm of number of pages to allocate per task structure
  58 * (including register backing store and memory stack):
  59 */
  60#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
  61# define IA64_TASK_STRUCT_LOG_NUM_PAGES         3
  62#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
  63# define IA64_TASK_STRUCT_LOG_NUM_PAGES         2
  64#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
  65# define IA64_TASK_STRUCT_LOG_NUM_PAGES         1
  66#else
  67# define IA64_TASK_STRUCT_LOG_NUM_PAGES         0
  68#endif
  69
  70#define IA64_RBS_OFFSET                 ((IA64_TASK_SIZE + 15) & ~15)
  71#define IA64_STK_OFFSET                 ((1 << IA64_TASK_STRUCT_LOG_NUM_PAGES)*PAGE_SIZE)
  72
  73#define INIT_TASK_SIZE                  IA64_STK_OFFSET
  74
  75#ifndef __ASSEMBLY__
  76
  77#include <asm/current.h>
  78#include <asm/page.h>
  79
  80/*
  81 * This struct defines the way the registers are saved on system
  82 * calls.
  83 *
  84 * We don't save all floating point register because the kernel
  85 * is compiled to use only a very small subset, so the other are
  86 * untouched.
  87 *
  88 * THIS STRUCTURE MUST BE A MULTIPLE 16-BYTE IN SIZE
  89 * (because the memory stack pointer MUST ALWAYS be aligned this way)
  90 *
  91 */
  92struct pt_regs {
  93        /* The following registers are saved by SAVE_MIN: */
  94
  95        unsigned long cr_ipsr;          /* interrupted task's psr */
  96        unsigned long cr_iip;           /* interrupted task's instruction pointer */
  97        unsigned long cr_ifs;           /* interrupted task's function state */
  98
  99        unsigned long ar_unat;          /* interrupted task's NaT register (preserved) */
 100        unsigned long ar_pfs;           /* prev function state  */
 101        unsigned long ar_rsc;           /* RSE configuration */
 102        /* The following two are valid only if cr_ipsr.cpl > 0: */
 103        unsigned long ar_rnat;          /* RSE NaT */
 104        unsigned long ar_bspstore;      /* RSE bspstore */
 105
 106        unsigned long pr;               /* 64 predicate registers (1 bit each) */
 107        unsigned long b6;               /* scratch */
 108        unsigned long loadrs;           /* size of dirty partition << 16 */
 109
 110        unsigned long r1;               /* the gp pointer */
 111        unsigned long r2;               /* scratch */
 112        unsigned long r3;               /* scratch */
 113        unsigned long r12;              /* interrupted task's memory stack pointer */
 114        unsigned long r13;              /* thread pointer */
 115        unsigned long r14;              /* scratch */
 116        unsigned long r15;              /* scratch */
 117
 118        unsigned long r8;               /* scratch (return value register 0) */
 119        unsigned long r9;               /* scratch (return value register 1) */
 120        unsigned long r10;              /* scratch (return value register 2) */
 121        unsigned long r11;              /* scratch (return value register 3) */
 122
 123        /* The following registers are saved by SAVE_REST: */
 124
 125        unsigned long r16;              /* scratch */
 126        unsigned long r17;              /* scratch */
 127        unsigned long r18;              /* scratch */
 128        unsigned long r19;              /* scratch */
 129        unsigned long r20;              /* scratch */
 130        unsigned long r21;              /* scratch */
 131        unsigned long r22;              /* scratch */
 132        unsigned long r23;              /* scratch */
 133        unsigned long r24;              /* scratch */
 134        unsigned long r25;              /* scratch */
 135        unsigned long r26;              /* scratch */
 136        unsigned long r27;              /* scratch */
 137        unsigned long r28;              /* scratch */
 138        unsigned long r29;              /* scratch */
 139        unsigned long r30;              /* scratch */
 140        unsigned long r31;              /* scratch */
 141
 142        unsigned long ar_ccv;           /* compare/exchange value (scratch) */
 143        unsigned long ar_fpsr;          /* floating point status (preserved) */
 144
 145        unsigned long b0;               /* return pointer (bp) */
 146        unsigned long b7;               /* scratch */
 147        /*
 148         * Floating point registers that the kernel considers
 149         * scratch:
 150         */
 151        struct ia64_fpreg f6;           /* scratch */
 152        struct ia64_fpreg f7;           /* scratch */
 153        struct ia64_fpreg f8;           /* scratch */
 154        struct ia64_fpreg f9;           /* scratch */
 155};
 156
 157/*
 158 * This structure contains the addition registers that need to
 159 * preserved across a context switch.  This generally consists of
 160 * "preserved" registers.
 161 */
 162struct switch_stack {
 163        unsigned long caller_unat;      /* user NaT collection register (preserved) */
 164        unsigned long ar_fpsr;          /* floating-point status register */
 165
 166        struct ia64_fpreg f2;           /* preserved */
 167        struct ia64_fpreg f3;           /* preserved */
 168        struct ia64_fpreg f4;           /* preserved */
 169        struct ia64_fpreg f5;           /* preserved */
 170
 171        struct ia64_fpreg f10;          /* scratch, but untouched by kernel */
 172        struct ia64_fpreg f11;          /* scratch, but untouched by kernel */
 173        struct ia64_fpreg f12;          /* scratch, but untouched by kernel */
 174        struct ia64_fpreg f13;          /* scratch, but untouched by kernel */
 175        struct ia64_fpreg f14;          /* scratch, but untouched by kernel */
 176        struct ia64_fpreg f15;          /* scratch, but untouched by kernel */
 177        struct ia64_fpreg f16;          /* preserved */
 178        struct ia64_fpreg f17;          /* preserved */
 179        struct ia64_fpreg f18;          /* preserved */
 180        struct ia64_fpreg f19;          /* preserved */
 181        struct ia64_fpreg f20;          /* preserved */
 182        struct ia64_fpreg f21;          /* preserved */
 183        struct ia64_fpreg f22;          /* preserved */
 184        struct ia64_fpreg f23;          /* preserved */
 185        struct ia64_fpreg f24;          /* preserved */
 186        struct ia64_fpreg f25;          /* preserved */
 187        struct ia64_fpreg f26;          /* preserved */
 188        struct ia64_fpreg f27;          /* preserved */
 189        struct ia64_fpreg f28;          /* preserved */
 190        struct ia64_fpreg f29;          /* preserved */
 191        struct ia64_fpreg f30;          /* preserved */
 192        struct ia64_fpreg f31;          /* preserved */
 193
 194        unsigned long r4;               /* preserved */
 195        unsigned long r5;               /* preserved */
 196        unsigned long r6;               /* preserved */
 197        unsigned long r7;               /* preserved */
 198
 199        unsigned long b0;               /* so we can force a direct return in copy_thread */
 200        unsigned long b1;
 201        unsigned long b2;
 202        unsigned long b3;
 203        unsigned long b4;
 204        unsigned long b5;
 205
 206        unsigned long ar_pfs;           /* previous function state */
 207        unsigned long ar_lc;            /* loop counter (preserved) */
 208        unsigned long ar_unat;          /* NaT bits for r4-r7 */
 209        unsigned long ar_rnat;          /* RSE NaT collection register */
 210        unsigned long ar_bspstore;      /* RSE dirty base (preserved) */
 211        unsigned long pr;               /* 64 predicate registers (1 bit each) */
 212};
 213
 214#ifdef __KERNEL__
 215  /* given a pointer to a task_struct, return the user's pt_regs */
 216# define ia64_task_regs(t)              (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
 217# define ia64_psr(regs)                 ((struct ia64_psr *) &(regs)->cr_ipsr)
 218# define user_mode(regs)                (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
 219
 220  struct task_struct;                   /* forward decl */
 221
 222  extern void show_regs (struct pt_regs *);
 223  extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,
 224                                              unsigned long *);
 225  extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,
 226                         unsigned long, long *);
 227  extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,
 228                         unsigned long, long);
 229  extern void ia64_flush_fph (struct task_struct *);
 230  extern void ia64_sync_fph (struct task_struct *);
 231  extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,
 232                                  unsigned long, unsigned long);
 233
 234  /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */
 235  extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);
 236  /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */
 237  extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);
 238
 239  extern void ia64_increment_ip (struct pt_regs *pt);
 240  extern void ia64_decrement_ip (struct pt_regs *pt);
 241
 242static inline void
 243force_successful_syscall_return (void)
 244{
 245        ia64_task_regs(current)->r8 = 0;
 246}
 247
 248#endif /* !__KERNEL__ */
 249
 250#endif /* !__ASSEMBLY__ */
 251
 252/*
 253 * The numbers chosen here are somewhat arbitrary but absolutely MUST
 254 * not overlap with any of the number assigned in <linux/ptrace.h>.
 255 */
 256#define PTRACE_SINGLEBLOCK      12      /* resume execution until next branch */
 257#define PTRACE_GETSIGINFO       13      /* get child's siginfo structure */
 258#define PTRACE_SETSIGINFO       14      /* set child's siginfo structure */
 259
 260#endif /* _ASM_IA64_PTRACE_H */
 261
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