Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 845143990a1d66f2c5bb77b8b69225cfe7eb195f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
 * 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"
 *
 */
#ifndef _ASM_IA64_PTRACE_H
#define _ASM_IA64_PTRACE_H

#ifndef ASM_OFFSETS_C
#include <asm/asm-offsets.h>
#endif
#include <uapi/asm/ptrace.h>

/*
 * 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

#ifndef __ASSEMBLY__

#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;
}

static inline int is_syscall_success(struct pt_regs *regs)
{
	return regs->r10 != -1;
}

static inline long regs_return_value(struct pt_regs *regs)
{
	if (is_syscall_success(regs))
		return regs->r8;
	else
		return -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);				\
})
/*
 * Why not default?  Because user_stack_pointer() on ia64 gives register
 * stack backing store instead...
 */
#define current_user_stack_pointer() (current_pt_regs()->r12)

  /* 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 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 /* !__ASSEMBLY__ */
#endif /* _ASM_IA64_PTRACE_H */