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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright (C) 1998-2004 Hewlett-Packard Co
   4 *      David Mosberger-Tang <davidm@hpl.hp.com>
   5 *      Stephane Eranian <eranian@hpl.hp.com>
   6 * Copyright (C) 2003 Intel Co
   7 *      Suresh Siddha <suresh.b.siddha@intel.com>
   8 *      Fenghua Yu <fenghua.yu@intel.com>
   9 *      Arun Sharma <arun.sharma@intel.com>
  10 *
  11 * 12/07/98     S. Eranian      added pt_regs & switch_stack
  12 * 12/21/98     D. Mosberger    updated to match latest code
  13 *  6/17/99     D. Mosberger    added second unat member to "struct switch_stack"
  14 *
  15 */
  16#ifndef _ASM_IA64_PTRACE_H
  17#define _ASM_IA64_PTRACE_H
  18
  19#ifndef ASM_OFFSETS_C
  20#include <asm/asm-offsets.h>
  21#endif
  22#include <uapi/asm/ptrace.h>
  23
  24/*
  25 * Base-2 logarithm of number of pages to allocate per task structure
  26 * (including register backing store and memory stack):
  27 */
  28#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
  29# define KERNEL_STACK_SIZE_ORDER                3
  30#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
  31# define KERNEL_STACK_SIZE_ORDER                2
  32#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
  33# define KERNEL_STACK_SIZE_ORDER                1
  34#else
  35# define KERNEL_STACK_SIZE_ORDER                0
  36#endif
  37
  38#define IA64_RBS_OFFSET                 ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 31) & ~31)
  39#define IA64_STK_OFFSET                 ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE)
  40
  41#define KERNEL_STACK_SIZE               IA64_STK_OFFSET
  42
  43#ifndef __ASSEMBLY__
  44
  45#include <asm/current.h>
  46#include <asm/page.h>
  47
  48/*
  49 * We use the ia64_psr(regs)->ri to determine which of the three
  50 * instructions in bundle (16 bytes) took the sample. Generate
  51 * the canonical representation by adding to instruction pointer.
  52 */
  53# define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
  54
  55static inline unsigned long user_stack_pointer(struct pt_regs *regs)
  56{
  57        /* FIXME: should this be bspstore + nr_dirty regs? */
  58        return regs->ar_bspstore;
  59}
  60
  61static inline int is_syscall_success(struct pt_regs *regs)
  62{
  63        return regs->r10 != -1;
  64}
  65
  66static inline long regs_return_value(struct pt_regs *regs)
  67{
  68        if (is_syscall_success(regs))
  69                return regs->r8;
  70        else
  71                return -regs->r8;
  72}
  73
  74/* Conserve space in histogram by encoding slot bits in address
  75 * bits 2 and 3 rather than bits 0 and 1.
  76 */
  77#define profile_pc(regs)                                                \
  78({                                                                      \
  79        unsigned long __ip = instruction_pointer(regs);                 \
  80        (__ip & ~3UL) + ((__ip & 3UL) << 2);                            \
  81})
  82/*
  83 * Why not default?  Because user_stack_pointer() on ia64 gives register
  84 * stack backing store instead...
  85 */
  86#define current_user_stack_pointer() (current_pt_regs()->r12)
  87
  88  /* given a pointer to a task_struct, return the user's pt_regs */
  89# define task_pt_regs(t)                (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
  90# define ia64_psr(regs)                 ((struct ia64_psr *) &(regs)->cr_ipsr)
  91# define user_mode(regs)                (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
  92# define user_stack(task,regs)  ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs))
  93# define fsys_mode(task,regs)                                   \
  94  ({                                                            \
  95          struct task_struct *_task = (task);                   \
  96          struct pt_regs *_regs = (regs);                       \
  97          !user_mode(_regs) && user_stack(_task, _regs);        \
  98  })
  99
 100  /*
 101   * System call handlers that, upon successful completion, need to return a negative value
 102   * should call force_successful_syscall_return() right before returning.  On architectures
 103   * where the syscall convention provides for a separate error flag (e.g., alpha, ia64,
 104   * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error
 105   * flag will not get set.  On architectures which do not support a separate error flag,
 106   * the macro is a no-op and the spurious error condition needs to be filtered out by some
 107   * other means (e.g., in user-level, by passing an extra argument to the syscall handler,
 108   * or something along those lines).
 109   *
 110   * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall.
 111   */
 112# define force_successful_syscall_return()      (task_pt_regs(current)->r8 = 0)
 113
 114  struct task_struct;                   /* forward decl */
 115  struct unw_frame_info;                /* forward decl */
 116
 117  extern void ia64_do_show_stack (struct unw_frame_info *, void *);
 118  extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,
 119                                              unsigned long *);
 120  extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,
 121                         unsigned long, long *);
 122  extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,
 123                         unsigned long, long);
 124  extern void ia64_flush_fph (struct task_struct *);
 125  extern void ia64_sync_fph (struct task_struct *);
 126  extern void ia64_sync_krbs(void);
 127  extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,
 128                                  unsigned long, unsigned long);
 129
 130  /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */
 131  extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);
 132  /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */
 133  extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);
 134
 135  extern void ia64_increment_ip (struct pt_regs *pt);
 136  extern void ia64_decrement_ip (struct pt_regs *pt);
 137
 138  extern void ia64_ptrace_stop(void);
 139  #define arch_ptrace_stop(code, info) \
 140        ia64_ptrace_stop()
 141  #define arch_ptrace_stop_needed(code, info) \
 142        (!test_thread_flag(TIF_RESTORE_RSE))
 143
 144  extern void ptrace_attach_sync_user_rbs (struct task_struct *);
 145  #define arch_ptrace_attach(child) \
 146        ptrace_attach_sync_user_rbs(child)
 147
 148  #define arch_has_single_step()  (1)
 149  #define arch_has_block_step()   (1)
 150
 151#endif /* !__ASSEMBLY__ */
 152#endif /* _ASM_IA64_PTRACE_H */
 153