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  */
 100 struct 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  */
 181 struct 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
 243 static 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 static inline int is_syscall_success(struct pt_regs *regs)
 250 {
 251         return regs->r10 != -1;
 252 }
 253
 254 static inline long regs_return_value(struct pt_regs *regs)
 255 {
 256         if (is_syscall_success(regs))
 257                 return regs->r8;
 258         else
 259                 return -regs->r8;
 260 }
 261
 262 /* Conserve space in histogram by encoding slot bits in address
 263  * bits 2 and 3 rather than bits 0 and 1.
 264  */
 265 #define profile_pc(regs)                                                \
 266 ({                                                                      \
 267         unsigned long __ip = instruction_pointer(regs);                 \
 268         (__ip & ~3UL) + ((__ip & 3UL) << 2);                            \
 269 })
 270
 271   /* given a pointer to a task_struct, return the user's pt_regs */
 272 # define task_pt_regs(t)                (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
 273 # define ia64_psr(regs)                 ((struct ia64_psr *) &(regs)->cr_ipsr)
 274 # define user_mode(regs)                (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
 275 # define user_stack(task,regs)  ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs))
 276 # define fsys_mode(task,regs)                                   \
 277   ({                                                            \
 278           struct task_struct *_task = (task);                   \
 279           struct pt_regs *_regs = (regs);                       \
 280           !user_mode(_regs) && user_stack(_task, _regs);        \
 281   })
 282
 283   /*
 284    * System call handlers that, upon successful completion, need to return a negative value
 285    * should call force_successful_syscall_return() right before returning.  On architectures
 286    * where the syscall convention provides for a separate error flag (e.g., alpha, ia64,
 287    * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error
 288    * flag will not get set.  On architectures which do not support a separate error flag,
 289    * the macro is a no-op and the spurious error condition needs to be filtered out by some
 290    * other means (e.g., in user-level, by passing an extra argument to the syscall handler,
 291    * or something along those lines).
 292    *
 293    * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall.
 294    */
 295 # define force_successful_syscall_return()      (task_pt_regs(current)->r8 = 0)
 296
 297   struct task_struct;                   /* forward decl */
 298   struct unw_frame_info;                /* forward decl */
 299
 300   extern void ia64_do_show_stack (struct unw_frame_info *, void *);
 301   extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,
 302                                               unsigned long *);
 303   extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,
 304                          unsigned long, long *);
 305   extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,
 306                          unsigned long, long);
 307   extern void ia64_flush_fph (struct task_struct *);
 308   extern void ia64_sync_fph (struct task_struct *);
 309   extern void ia64_sync_krbs(void);
 310   extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,
 311                                   unsigned long, unsigned long);
 312
 313   /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */
 314   extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);
 315   /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */
 316   extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);
 317
 318   extern void ia64_increment_ip (struct pt_regs *pt);
 319   extern void ia64_decrement_ip (struct pt_regs *pt);
 320
 321   extern void ia64_ptrace_stop(void);
 322   #define arch_ptrace_stop(code, info) \
 323         ia64_ptrace_stop()
 324   #define arch_ptrace_stop_needed(code, info) \
 325         (!test_thread_flag(TIF_RESTORE_RSE))
 326
 327   extern void ptrace_attach_sync_user_rbs (struct task_struct *);
 328   #define arch_ptrace_attach(child) \
 329         ptrace_attach_sync_user_rbs(child)
 330
 331   #define arch_has_single_step()  (1)
 332   #define arch_has_block_step()   (1)
 333
 334 #endif /* !__KERNEL__ */
 335
 336 /* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */
 337 struct pt_all_user_regs {
 338         unsigned long nat;
 339         unsigned long cr_iip;
 340         unsigned long cfm;
 341         unsigned long cr_ipsr;
 342         unsigned long pr;
 343
 344         unsigned long gr[32];
 345         unsigned long br[8];
 346         unsigned long ar[128];
 347         struct ia64_fpreg fr[128];
 348 };
 349
 350 #endif /* !__ASSEMBLY__ */
 351
 352 /* indices to application-registers array in pt_all_user_regs */
 353 #define PT_AUR_RSC      16
 354 #define PT_AUR_BSP      17
 355 #define PT_AUR_BSPSTORE 18
 356 #define PT_AUR_RNAT     19
 357 #define PT_AUR_CCV      32
 358 #define PT_AUR_UNAT     36
 359 #define PT_AUR_FPSR     40
 360 #define PT_AUR_PFS      64
 361 #define PT_AUR_LC       65
 362 #define PT_AUR_EC       66
 363
 364 /*
 365  * The numbers chosen here are somewhat arbitrary but absolutely MUST
 366  * not overlap with any of the number assigned in <linux/ptrace.h>.
 367  */
 368 #define PTRACE_SINGLEBLOCK      12      /* resume execution until next branch */
 369 #define PTRACE_OLD_GETSIGINFO   13      /* (replaced by PTRACE_GETSIGINFO in <linux/ptrace.h>)  */
 370 #define PTRACE_OLD_SETSIGINFO   14      /* (replaced by PTRACE_SETSIGINFO in <linux/ptrace.h>)  */
 371 #define PTRACE_GETREGS          18      /* get all registers (pt_all_user_regs) in one shot */
 372 #define PTRACE_SETREGS          19      /* set all registers (pt_all_user_regs) in one shot */
 373
 374 #define PTRACE_OLDSETOPTIONS    21
 375
 376 #endif /* _ASM_IA64_PTRACE_H */