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