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
user_stack_pointer(struct pt_regs * regs)55 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
56 {
57 return regs->r12;
58 }
59
is_syscall_success(struct pt_regs * regs)60 static inline int is_syscall_success(struct pt_regs *regs)
61 {
62 return regs->r10 != -1;
63 }
64
regs_return_value(struct pt_regs * regs)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 /* given a pointer to a task_struct, return the user's pt_regs */
83 # define task_pt_regs(t) (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
84 # define ia64_psr(regs) ((struct ia64_psr *) &(regs)->cr_ipsr)
85 # define user_mode(regs) (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
86 # define user_stack(task,regs) ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs))
87 # define fsys_mode(task,regs) \
88 ({ \
89 struct task_struct *_task = (task); \
90 struct pt_regs *_regs = (regs); \
91 !user_mode(_regs) && user_stack(_task, _regs); \
92 })
93
94 /*
95 * System call handlers that, upon successful completion, need to return a negative value
96 * should call force_successful_syscall_return() right before returning. On architectures
97 * where the syscall convention provides for a separate error flag (e.g., alpha, ia64,
98 * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error
99 * flag will not get set. On architectures which do not support a separate error flag,
100 * the macro is a no-op and the spurious error condition needs to be filtered out by some
101 * other means (e.g., in user-level, by passing an extra argument to the syscall handler,
102 * or something along those lines).
103 *
104 * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall.
105 */
106 # define force_successful_syscall_return() (task_pt_regs(current)->r8 = 0)
107
108 struct task_struct; /* forward decl */
109 struct unw_frame_info; /* forward decl */
110
111 extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,
112 unsigned long *);
113 extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,
114 unsigned long, long *);
115 extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,
116 unsigned long, long);
117 extern void ia64_flush_fph (struct task_struct *);
118 extern void ia64_sync_fph (struct task_struct *);
119 extern void ia64_sync_krbs(void);
120 extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,
121 unsigned long, unsigned long);
122
123 /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */
124 extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);
125 /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */
126 extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);
127
128 extern void ia64_increment_ip (struct pt_regs *pt);
129 extern void ia64_decrement_ip (struct pt_regs *pt);
130
131 extern void ia64_ptrace_stop(void);
132 #define arch_ptrace_stop(code, info) \
133 ia64_ptrace_stop()
134 #define arch_ptrace_stop_needed(code, info) \
135 (!test_thread_flag(TIF_RESTORE_RSE))
136
137 extern void ptrace_attach_sync_user_rbs (struct task_struct *);
138 #define arch_ptrace_attach(child) \
139 ptrace_attach_sync_user_rbs(child)
140
141 #define arch_has_single_step() (1)
142 #define arch_has_block_step() (1)
143
144 #endif /* !__ASSEMBLY__ */
145 #endif /* _ASM_IA64_PTRACE_H */
146