LXR linux/arch/ia64/include/asm/ptrace.h

   1#ifndef _ASM_IA64_PTRACE_H
   2#define _ASM_IA64_PTRACE_H
   3
   4/*
   5 * Copyright (C) 1998-2004 Hewlett-Packard Co
   6 *      David Mosberger-Tang <davidm@hpl.hp.com>
   7 *      Stephane Eranian <eranian@hpl.hp.com>
   8 * Copyright (C) 2003 Intel Co
   9 *      Suresh Siddha <suresh.b.siddha@intel.com>
  10 *      Fenghua Yu <fenghua.yu@intel.com>
  11 *      Arun Sharma <arun.sharma@intel.com>
  12 *
  13 * 12/07/98     S. Eranian      added pt_regs & switch_stack
  14 * 12/21/98     D. Mosberger    updated to match latest code
  15 *  6/17/99     D. Mosberger    added second unat member to "struct switch_stack"
  16 *
  17 */
  18/*
  19 * When a user process is blocked, its state looks as follows:
  20 *
  21 *            +----------------------+  ------- IA64_STK_OFFSET
  22 *            |                      |   ^
  23 *            | struct pt_regs       |   |
  24 *            |                      |   |
  25 *            +----------------------+   |
  26 *            |                      |   |
  27 *            |    memory stack      |   |
  28 *            | (growing downwards)  |   |
  29 *            //.....................//  |
  30 *                                       |
  31 *            //.....................//  |
  32 *            |                      |   |
  33 *            +----------------------+   |
  34 *            | struct switch_stack  |   |
  35 *            |                      |   |
  36 *            +----------------------+   |
  37 *            |                      |   |
  38 *            //.....................//  |
  39 *                                       |
  40 *            //.....................//  |
  41 *            |                      |   |
  42 *            |  register stack      |   |
  43 *            | (growing upwards)    |   |
  44 *            |                      |   |
  45 *            +----------------------+   |  --- IA64_RBS_OFFSET
  46 *            |  struct thread_info  |   |  ^
  47 *            +----------------------+   |  |
  48 *            |                      |   |  |
  49 *            |  struct task_struct  |   |  |
  50 * current -> |                      |   |  |
  51 *            +----------------------+ -------
  52 *
  53 * Note that ar.ec is not saved explicitly in pt_reg or switch_stack.
  54 * This is because ar.ec is saved as part of ar.pfs.
  55 */
  56
  57
  58#include <asm/fpu.h>
  59
  60#ifdef __KERNEL__
  61#ifndef ASM_OFFSETS_C
  62#include <asm/asm-offsets.h>
  63#endif
  64
  65/*
  66 * Base-2 logarithm of number of pages to allocate per task structure
  67 * (including register backing store and memory stack):
  68 */
  69#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
  70# define KERNEL_STACK_SIZE_ORDER                3
  71#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
  72# define KERNEL_STACK_SIZE_ORDER                2
  73#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
  74# define KERNEL_STACK_SIZE_ORDER                1
  75#else
  76# define KERNEL_STACK_SIZE_ORDER                0
  77#endif
  78
  79#define IA64_RBS_OFFSET                 ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 31) & ~31)
  80#define IA64_STK_OFFSET                 ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE)
  81
  82#define KERNEL_STACK_SIZE               IA64_STK_OFFSET
  83
  84#endif /* __KERNEL__ */
  85
  86#ifndef __ASSEMBLY__
  87
  88/*
  89 * This struct defines the way the registers are saved on system
  90 * calls.
  91 *
  92 * We don't save all floating point register because the kernel
  93 * is compiled to use only a very small subset, so the other are
  94 * untouched.
  95 *
  96 * THIS STRUCTURE MUST BE A MULTIPLE 16-BYTE IN SIZE
  97 * (because the memory stack pointer MUST ALWAYS be aligned this way)
  98 *
  99 */
 100struct pt_regs {
 101        /* The following registers are saved by SAVE_MIN: */
 102        unsigned long b6;               /* scratch */
 103        unsigned long b7;               /* scratch */
 104
 105        unsigned long ar_csd;           /* used by cmp8xchg16 (scratch) */
 106        unsigned long ar_ssd;           /* reserved for future use (scratch) */
 107
 108        unsigned long r8;               /* scratch (return value register 0) */
 109        unsigned long r9;               /* scratch (return value register 1) */
 110        unsigned long r10;              /* scratch (return value register 2) */
 111        unsigned long r11;              /* scratch (return value register 3) */
 112
 113        unsigned long cr_ipsr;          /* interrupted task's psr */
 114        unsigned long cr_iip;           /* interrupted task's instruction pointer */
 115        /*
 116         * interrupted task's function state; if bit 63 is cleared, it
 117         * contains syscall's ar.pfs.pfm:
 118         */
 119        unsigned long cr_ifs;
 120
 121        unsigned long ar_unat;          /* interrupted task's NaT register (preserved) */
 122        unsigned long ar_pfs;           /* prev function state  */
 123        unsigned long ar_rsc;           /* RSE configuration */
 124        /* The following two are valid only if cr_ipsr.cpl > 0 || ti->flags & _TIF_MCA_INIT */
 125        unsigned long ar_rnat;          /* RSE NaT */
 126        unsigned long ar_bspstore;      /* RSE bspstore */
 127
 128        unsigned long pr;               /* 64 predicate registers (1 bit each) */
 129        unsigned long b0;               /* return pointer (bp) */
 130        unsigned long loadrs;           /* size of dirty partition << 16 */
 131
 132        unsigned long r1;               /* the gp pointer */
 133        unsigned long r12;              /* interrupted task's memory stack pointer */
 134        unsigned long r13;              /* thread pointer */
 135
 136        unsigned long ar_fpsr;          /* floating point status (preserved) */
 137        unsigned long r15;              /* scratch */
 138
 139        /* The remaining registers are NOT saved for system calls.  */
 140
 141        unsigned long r14;              /* scratch */
 142        unsigned long r2;               /* scratch */
 143        unsigned long r3;               /* scratch */
 144
 145        /* The following registers are saved by SAVE_REST: */
 146        unsigned long r16;              /* scratch */
 147        unsigned long r17;              /* scratch */
 148        unsigned long r18;              /* scratch */
 149        unsigned long r19;              /* scratch */
 150        unsigned long r20;              /* scratch */
 151        unsigned long r21;              /* scratch */
 152        unsigned long r22;              /* scratch */
 153        unsigned long r23;              /* scratch */
 154        unsigned long r24;              /* scratch */
 155        unsigned long r25;              /* scratch */
 156        unsigned long r26;              /* scratch */
 157        unsigned long r27;              /* scratch */
 158        unsigned long r28;              /* scratch */
 159        unsigned long r29;              /* scratch */
 160        unsigned long r30;              /* scratch */
 161        unsigned long r31;              /* scratch */
 162
 163        unsigned long ar_ccv;           /* compare/exchange value (scratch) */
 164
 165        /*
 166         * Floating point registers that the kernel considers scratch:
 167         */
 168        struct ia64_fpreg f6;           /* scratch */
 169        struct ia64_fpreg f7;           /* scratch */
 170        struct ia64_fpreg f8;           /* scratch */
 171        struct ia64_fpreg f9;           /* scratch */
 172        struct ia64_fpreg f10;          /* scratch */
 173        struct ia64_fpreg f11;          /* scratch */
 174};
 175
 176/*
 177 * This structure contains the addition registers that need to
 178 * preserved across a context switch.  This generally consists of
 179 * "preserved" registers.
 180 */
 181struct switch_stack {
 182        unsigned long caller_unat;      /* user NaT collection register (preserved) */
 183        unsigned long ar_fpsr;          /* floating-point status register */
 184
 185        struct ia64_fpreg f2;           /* preserved */
 186        struct ia64_fpreg f3;           /* preserved */
 187        struct ia64_fpreg f4;           /* preserved */
 188        struct ia64_fpreg f5;           /* preserved */
 189
 190        struct ia64_fpreg f12;          /* scratch, but untouched by kernel */
 191        struct ia64_fpreg f13;          /* scratch, but untouched by kernel */
 192        struct ia64_fpreg f14;          /* scratch, but untouched by kernel */
 193        struct ia64_fpreg f15;          /* scratch, but untouched by kernel */
 194        struct ia64_fpreg f16;          /* preserved */
 195        struct ia64_fpreg f17;          /* preserved */
 196        struct ia64_fpreg f18;          /* preserved */
 197        struct ia64_fpreg f19;          /* preserved */
 198        struct ia64_fpreg f20;          /* preserved */
 199        struct ia64_fpreg f21;          /* preserved */
 200        struct ia64_fpreg f22;          /* preserved */
 201        struct ia64_fpreg f23;          /* preserved */
 202        struct ia64_fpreg f24;          /* preserved */
 203        struct ia64_fpreg f25;          /* preserved */
 204        struct ia64_fpreg f26;          /* preserved */
 205        struct ia64_fpreg f27;          /* preserved */
 206        struct ia64_fpreg f28;          /* preserved */
 207        struct ia64_fpreg f29;          /* preserved */
 208        struct ia64_fpreg f30;          /* preserved */
 209        struct ia64_fpreg f31;          /* preserved */
 210
 211        unsigned long r4;               /* preserved */
 212        unsigned long r5;               /* preserved */
 213        unsigned long r6;               /* preserved */
 214        unsigned long r7;               /* preserved */
 215
 216        unsigned long b0;               /* so we can force a direct return in copy_thread */
 217        unsigned long b1;
 218        unsigned long b2;
 219        unsigned long b3;
 220        unsigned long b4;
 221        unsigned long b5;
 222
 223        unsigned long ar_pfs;           /* previous function state */
 224        unsigned long ar_lc;            /* loop counter (preserved) */
 225        unsigned long ar_unat;          /* NaT bits for r4-r7 */
 226        unsigned long ar_rnat;          /* RSE NaT collection register */
 227        unsigned long ar_bspstore;      /* RSE dirty base (preserved) */
 228        unsigned long pr;               /* 64 predicate registers (1 bit each) */
 229};
 230
 231#ifdef __KERNEL__
 232
 233#include <asm/current.h>
 234#include <asm/page.h>
 235
 236/*
 237 * We use the ia64_psr(regs)->ri to determine which of the three
 238 * instructions in bundle (16 bytes) took the sample. Generate
 239 * the canonical representation by adding to instruction pointer.
 240 */
 241# define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
 242
 243static inline unsigned long user_stack_pointer(struct pt_regs *regs)
 244{
 245        /* FIXME: should this be bspstore + nr_dirty regs? */
 246        return regs->ar_bspstore;
 247}
 248
 249#define regs_return_value(regs) ((regs)->r8)
 250
 251/* Conserve space in histogram by encoding slot bits in address
 252 * bits 2 and 3 rather than bits 0 and 1.
 253 */
 254#define profile_pc(regs)                                                \
 255({                                                                      \
 256        unsigned long __ip = instruction_pointer(regs);                 \
 257        (__ip & ~3UL) + ((__ip & 3UL) << 2);                            \
 258})
 259
 260  /* given a pointer to a task_struct, return the user's pt_regs */
 261# define task_pt_regs(t)                (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
 262# define ia64_psr(regs)                 ((struct ia64_psr *) &(regs)->cr_ipsr)
 263# define user_mode(regs)                (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
 264# define user_stack(task,regs)  ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs))
 265# define fsys_mode(task,regs)                                   \
 266  ({                                                            \
 267          struct task_struct *_task = (task);                   \
 268          struct pt_regs *_regs = (regs);                       \
 269          !user_mode(_regs) && user_stack(_task, _regs);        \
 270  })
 271
 272  /*
 273   * System call handlers that, upon successful completion, need to return a negative value
 274   * should call force_successful_syscall_return() right before returning.  On architectures
 275   * where the syscall convention provides for a separate error flag (e.g., alpha, ia64,
 276   * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error
 277   * flag will not get set.  On architectures which do not support a separate error flag,
 278   * the macro is a no-op and the spurious error condition needs to be filtered out by some
 279   * other means (e.g., in user-level, by passing an extra argument to the syscall handler,
 280   * or something along those lines).
 281   *
 282   * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall.
 283   */
 284# define force_successful_syscall_return()      (task_pt_regs(current)->r8 = 0)
 285
 286  struct task_struct;                   /* forward decl */
 287  struct unw_frame_info;                /* forward decl */
 288
 289  extern void show_regs (struct pt_regs *);
 290  extern void ia64_do_show_stack (struct unw_frame_info *, void *);
 291  extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,
 292                                              unsigned long *);
 293  extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,
 294                         unsigned long, long *);
 295  extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,
 296                         unsigned long, long);
 297  extern void ia64_flush_fph (struct task_struct *);
 298  extern void ia64_sync_fph (struct task_struct *);
 299  extern void ia64_sync_krbs(void);
 300  extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,
 301                                  unsigned long, unsigned long);
 302
 303  /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */
 304  extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);
 305  /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */
 306  extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);
 307
 308  extern void ia64_increment_ip (struct pt_regs *pt);
 309  extern void ia64_decrement_ip (struct pt_regs *pt);
 310
 311  extern void ia64_ptrace_stop(void);
 312  #define arch_ptrace_stop(code, info) \
 313        ia64_ptrace_stop()
 314  #define arch_ptrace_stop_needed(code, info) \
 315        (!test_thread_flag(TIF_RESTORE_RSE))
 316
 317  extern void ptrace_attach_sync_user_rbs (struct task_struct *);
 318  #define arch_ptrace_attach(child) \
 319        ptrace_attach_sync_user_rbs(child)
 320
 321  #define arch_has_single_step()  (1)
 322  extern void user_enable_single_step(struct task_struct *);
 323  extern void user_disable_single_step(struct task_struct *);
 324
 325  #define arch_has_block_step()   (1)
 326  extern void user_enable_block_step(struct task_struct *);
 327
 328#endif /* !__KERNEL__ */
 329
 330/* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */
 331struct pt_all_user_regs {
 332        unsigned long nat;
 333        unsigned long cr_iip;
 334        unsigned long cfm;
 335        unsigned long cr_ipsr;
 336        unsigned long pr;
 337
 338        unsigned long gr[32];
 339        unsigned long br[8];
 340        unsigned long ar[128];
 341        struct ia64_fpreg fr[128];
 342};
 343
 344#endif /* !__ASSEMBLY__ */
 345
 346/* indices to application-registers array in pt_all_user_regs */
 347#define PT_AUR_RSC      16
 348#define PT_AUR_BSP      17
 349#define PT_AUR_BSPSTORE 18
 350#define PT_AUR_RNAT     19
 351#define PT_AUR_CCV      32
 352#define PT_AUR_UNAT     36
 353#define PT_AUR_FPSR     40
 354#define PT_AUR_PFS      64
 355#define PT_AUR_LC       65
 356#define PT_AUR_EC       66
 357
 358/*
 359 * The numbers chosen here are somewhat arbitrary but absolutely MUST
 360 * not overlap with any of the number assigned in <linux/ptrace.h>.
 361 */
 362#define PTRACE_SINGLEBLOCK      12      /* resume execution until next branch */
 363#define PTRACE_OLD_GETSIGINFO   13      /* (replaced by PTRACE_GETSIGINFO in <linux/ptrace.h>)  */
 364#define PTRACE_OLD_SETSIGINFO   14      /* (replaced by PTRACE_SETSIGINFO in <linux/ptrace.h>)  */
 365#define PTRACE_GETREGS          18      /* get all registers (pt_all_user_regs) in one shot */
 366#define PTRACE_SETREGS          19      /* set all registers (pt_all_user_regs) in one shot */
 367
 368#define PTRACE_OLDSETOPTIONS    21
 369
 370#endif /* _ASM_IA64_PTRACE_H */
 371