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
55 static 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
61 static inline int is_syscall_success(struct pt_regs *regs)
62 {
63 return regs->r10 != -1;
64 }
65
66 static 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
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