1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* thread_info.h: sparc64 low-level thread information
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 */
6
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
9
10 #ifdef __KERNEL__
11
12 #define NSWINS 7
13
14 #define TI_FLAG_BYTE_FAULT_CODE 0
15 #define TI_FLAG_FAULT_CODE_SHIFT 56
16 #define TI_FLAG_BYTE_WSTATE 1
17 #define TI_FLAG_WSTATE_SHIFT 48
18 #define TI_FLAG_BYTE_NOERROR 2
19 #define TI_FLAG_BYTE_NOERROR_SHIFT 40
20 #define TI_FLAG_BYTE_FPDEPTH 3
21 #define TI_FLAG_FPDEPTH_SHIFT 32
22 #define TI_FLAG_BYTE_CWP 4
23 #define TI_FLAG_CWP_SHIFT 24
24 #define TI_FLAG_BYTE_WSAVED 5
25 #define TI_FLAG_WSAVED_SHIFT 16
26
27 #include <asm/page.h>
28
29 #ifndef __ASSEMBLY__
30
31 #include <asm/ptrace.h>
32 #include <asm/types.h>
33
34 struct task_struct;
35
36 struct thread_info {
37 /* D$ line 1 */
38 struct task_struct *task;
39 unsigned long flags;
40 __u8 fpsaved[7];
41 __u8 status;
42 unsigned long ksp;
43
44 /* D$ line 2 */
45 unsigned long fault_address;
46 struct pt_regs *kregs;
47 int preempt_count; /* 0 => preemptable, <0 => BUG */
48 __u8 new_child;
49 __u8 __pad;
50 __u16 cpu;
51
52 unsigned long *utraps;
53
54 struct reg_window reg_window[NSWINS];
55 unsigned long rwbuf_stkptrs[NSWINS];
56
57 unsigned long gsr[7];
58 unsigned long xfsr[7];
59
60 struct pt_regs *kern_una_regs;
61 unsigned int kern_una_insn;
62
63 unsigned long fpregs[(7 * 256) / sizeof(unsigned long)]
64 __attribute__ ((aligned(64)));
65 };
66
67 #endif /* !(__ASSEMBLY__) */
68
69 /* offsets into the thread_info struct for assembly code access */
70 #define TI_TASK 0x00000000
71 #define TI_FLAGS 0x00000008
72 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
73 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
74 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
75 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
76 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
77 #define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
78 #define TI_FPSAVED 0x00000010
79 #define TI_KSP 0x00000018
80 #define TI_FAULT_ADDR 0x00000020
81 #define TI_KREGS 0x00000028
82 #define TI_PRE_COUNT 0x00000030
83 #define TI_NEW_CHILD 0x00000034
84 #define TI_CPU 0x00000036
85 #define TI_UTRAPS 0x00000038
86 #define TI_REG_WINDOW 0x00000040
87 #define TI_RWIN_SPTRS 0x000003c0
88 #define TI_GSR 0x000003f8
89 #define TI_XFSR 0x00000430
90 #define TI_KUNA_REGS 0x00000468
91 #define TI_KUNA_INSN 0x00000470
92 #define TI_FPREGS 0x00000480
93
94 /* We embed this in the uppermost byte of thread_info->flags */
95 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
96 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
97 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
98 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
99 #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
100 #define FAULT_CODE_BAD_RA 0x20 /* Bad RA for sun4v */
101
102 #if PAGE_SHIFT == 13
103 #define THREAD_SIZE (2*PAGE_SIZE)
104 #define THREAD_SHIFT (PAGE_SHIFT + 1)
105 #else /* PAGE_SHIFT == 13 */
106 #define THREAD_SIZE PAGE_SIZE
107 #define THREAD_SHIFT PAGE_SHIFT
108 #endif /* PAGE_SHIFT == 13 */
109
110 /*
111 * macros/functions for gaining access to the thread information structure
112 */
113 #ifndef __ASSEMBLY__
114
115 #define INIT_THREAD_INFO(tsk) \
116 { \
117 .task = &tsk, \
118 .preempt_count = INIT_PREEMPT_COUNT, \
119 .kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \
120 }
121
122 /* how to get the thread information struct from C */
123 #ifndef BUILD_VDSO
124 register struct thread_info *current_thread_info_reg asm("g6");
125 #define current_thread_info() (current_thread_info_reg)
126 #else
127 extern struct thread_info *current_thread_info(void);
128 #endif
129
130 /* thread information allocation */
131 #if PAGE_SHIFT == 13
132 #define THREAD_SIZE_ORDER 1
133 #else /* PAGE_SHIFT == 13 */
134 #define THREAD_SIZE_ORDER 0
135 #endif /* PAGE_SHIFT == 13 */
136
137 #define __thread_flag_byte_ptr(ti) \
138 ((unsigned char *)(&((ti)->flags)))
139 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
140
141 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
142 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
143 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
144 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
145 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
146 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
147 #define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
148 #define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
149 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
150 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
151 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
152 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
153 #endif /* !(__ASSEMBLY__) */
154
155 /*
156 * Thread information flags, only 16 bits are available as we encode
157 * other values into the upper 6 bytes.
158 *
159 * On trap return we need to test several values:
160 *
161 * user: need_resched, notify_resume, sigpending, wsaved
162 * kernel: fpdepth
163 *
164 * So to check for work in the kernel case we simply load the fpdepth
165 * byte out of the flags and test it. For the user case we encode the
166 * lower 3 bytes of flags as follows:
167 * ----------------------------------------
168 * | wsaved | flags byte 1 | flags byte 2 |
169 * ----------------------------------------
170 * This optimizes the user test into:
171 * ldx [%g6 + TI_FLAGS], REG1
172 * sethi %hi(_TIF_USER_WORK_MASK), REG2
173 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
174 * andcc REG1, REG2, %g0
175 * be,pt no_work_to_do
176 * nop
177 */
178 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
179 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
180 #define TIF_SIGPENDING 2 /* signal pending */
181 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
182 #define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */
183 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
184 #define TIF_UPROBE 6 /* breakpointed or singlestepped */
185 #define TIF_32BIT 7 /* 32-bit binary */
186 #define TIF_NOHZ 8 /* in adaptive nohz mode */
187 #define TIF_SECCOMP 9 /* secure computing */
188 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
189 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
190 /* NOTE: Thread flags >= 12 should be ones we have no interest
191 * in using in assembly, else we can't use the mask as
192 * an immediate value in instructions such as andcc.
193 */
194 #define TIF_MCDPER 12 /* Precise MCD exception */
195 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */
196 #define TIF_POLLING_NRFLAG 14
197
198 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
199 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
200 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
201 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
202 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
203 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
204 #define _TIF_UPROBE (1<<TIF_UPROBE)
205 #define _TIF_32BIT (1<<TIF_32BIT)
206 #define _TIF_NOHZ (1<<TIF_NOHZ)
207 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
208 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
209 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
210 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
211
212 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
213 _TIF_DO_NOTIFY_RESUME_MASK | \
214 _TIF_NEED_RESCHED)
215 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \
216 _TIF_SIGPENDING | _TIF_UPROBE | \
217 _TIF_NOTIFY_SIGNAL)
218
219 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
220
221 /*
222 * Thread-synchronous status.
223 *
224 * This is different from the flags in that nobody else
225 * ever touches our thread-synchronous status, so we don't
226 * have to worry about atomic accesses.
227 *
228 * Note that there are only 8 bits available.
229 */
230
231 #ifndef __ASSEMBLY__
232
233 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
234 #define test_thread_64bit_stack(__SP) \
235 ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
236 false : true)
237
238 #endif /* !__ASSEMBLY__ */
239
240 #endif /* __KERNEL__ */
241
242 #endif /* _ASM_THREAD_INFO_H */
243
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