1 /* thread_info.h: sparc64 low-level thread information
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 */
5
6 #ifndef _ASM_THREAD_INFO_H
7 #define _ASM_THREAD_INFO_H
8
9 #ifdef __KERNEL__
10
11 #define NSWINS 7
12
13 #define TI_FLAG_BYTE_FAULT_CODE 0
14 #define TI_FLAG_FAULT_CODE_SHIFT 56
15 #define TI_FLAG_BYTE_WSTATE 1
16 #define TI_FLAG_WSTATE_SHIFT 48
17 #define TI_FLAG_BYTE_NOERROR 2
18 #define TI_FLAG_BYTE_NOERROR_SHIFT 40
19 #define TI_FLAG_BYTE_FPDEPTH 3
20 #define TI_FLAG_FPDEPTH_SHIFT 32
21 #define TI_FLAG_BYTE_CWP 4
22 #define TI_FLAG_CWP_SHIFT 24
23 #define TI_FLAG_BYTE_WSAVED 5
24 #define TI_FLAG_WSAVED_SHIFT 16
25
26 #include <asm/page.h>
27
28 #ifndef __ASSEMBLY__
29
30 #include <asm/ptrace.h>
31 #include <asm/types.h>
32
33 struct task_struct;
34 struct exec_domain;
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 struct exec_domain *exec_domain;
48 int preempt_count; /* 0 => preemptable, <0 => BUG */
49 __u8 new_child;
50 __u8 current_ds;
51 __u16 cpu;
52
53 unsigned long *utraps;
54
55 struct reg_window reg_window[NSWINS];
56 unsigned long rwbuf_stkptrs[NSWINS];
57
58 unsigned long gsr[7];
59 unsigned long xfsr[7];
60
61 struct pt_regs *kern_una_regs;
62 unsigned int kern_una_insn;
63
64 unsigned long fpregs[(7 * 256) / sizeof(unsigned long)]
65 __attribute__ ((aligned(64)));
66 };
67
68 #endif /* !(__ASSEMBLY__) */
69
70 /* offsets into the thread_info struct for assembly code access */
71 #define TI_TASK 0x00000000
72 #define TI_FLAGS 0x00000008
73 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
74 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
75 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
76 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
77 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
78 #define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
79 #define TI_FPSAVED 0x00000010
80 #define TI_KSP 0x00000018
81 #define TI_FAULT_ADDR 0x00000020
82 #define TI_KREGS 0x00000028
83 #define TI_EXEC_DOMAIN 0x00000030
84 #define TI_PRE_COUNT 0x00000038
85 #define TI_NEW_CHILD 0x0000003c
86 #define TI_CURRENT_DS 0x0000003d
87 #define TI_CPU 0x0000003e
88 #define TI_UTRAPS 0x00000040
89 #define TI_REG_WINDOW 0x00000048
90 #define TI_RWIN_SPTRS 0x000003c8
91 #define TI_GSR 0x00000400
92 #define TI_XFSR 0x00000438
93 #define TI_KUNA_REGS 0x00000470
94 #define TI_KUNA_INSN 0x00000478
95 #define TI_FPREGS 0x00000480
96
97 /* We embed this in the uppermost byte of thread_info->flags */
98 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
99 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
100 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
101 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
102 #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
103 #define FAULT_CODE_BAD_RA 0x20 /* Bad RA for sun4v */
104
105 #if PAGE_SHIFT == 13
106 #define THREAD_SIZE (2*PAGE_SIZE)
107 #define THREAD_SHIFT (PAGE_SHIFT + 1)
108 #else /* PAGE_SHIFT == 13 */
109 #define THREAD_SIZE PAGE_SIZE
110 #define THREAD_SHIFT PAGE_SHIFT
111 #endif /* PAGE_SHIFT == 13 */
112
113 /*
114 * macros/functions for gaining access to the thread information structure
115 */
116 #ifndef __ASSEMBLY__
117
118 #define INIT_THREAD_INFO(tsk) \
119 { \
120 .task = &tsk, \
121 .current_ds = ASI_P, \
122 .exec_domain = &default_exec_domain, \
123 .preempt_count = INIT_PREEMPT_COUNT, \
124 }
125
126 #define init_thread_info (init_thread_union.thread_info)
127 #define init_stack (init_thread_union.stack)
128
129 /* how to get the thread information struct from C */
130 register struct thread_info *current_thread_info_reg asm("g6");
131 #define current_thread_info() (current_thread_info_reg)
132
133 /* thread information allocation */
134 #if PAGE_SHIFT == 13
135 #define THREAD_SIZE_ORDER 1
136 #else /* PAGE_SHIFT == 13 */
137 #define THREAD_SIZE_ORDER 0
138 #endif /* PAGE_SHIFT == 13 */
139
140 #define __thread_flag_byte_ptr(ti) \
141 ((unsigned char *)(&((ti)->flags)))
142 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
143
144 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
145 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
146 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
147 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
148 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
149 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
150 #define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
151 #define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
152 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
153 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
154 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
155 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
156 #endif /* !(__ASSEMBLY__) */
157
158 /*
159 * Thread information flags, only 16 bits are available as we encode
160 * other values into the upper 6 bytes.
161 *
162 * On trap return we need to test several values:
163 *
164 * user: need_resched, notify_resume, sigpending, wsaved
165 * kernel: fpdepth
166 *
167 * So to check for work in the kernel case we simply load the fpdepth
168 * byte out of the flags and test it. For the user case we encode the
169 * lower 3 bytes of flags as follows:
170 * ----------------------------------------
171 * | wsaved | flags byte 1 | flags byte 2 |
172 * ----------------------------------------
173 * This optimizes the user test into:
174 * ldx [%g6 + TI_FLAGS], REG1
175 * sethi %hi(_TIF_USER_WORK_MASK), REG2
176 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
177 * andcc REG1, REG2, %g0
178 * be,pt no_work_to_do
179 * nop
180 */
181 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
182 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
183 #define TIF_SIGPENDING 2 /* signal pending */
184 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
185 /* flag bit 4 is available */
186 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
187 /* flag bit 6 is available */
188 #define TIF_32BIT 7 /* 32-bit binary */
189 #define TIF_NOHZ 8 /* in adaptive nohz mode */
190 #define TIF_SECCOMP 9 /* secure computing */
191 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
192 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
193 /* NOTE: Thread flags >= 12 should be ones we have no interest
194 * in using in assembly, else we can't use the mask as
195 * an immediate value in instructions such as andcc.
196 */
197 /* flag bit 12 is available */
198 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */
199 #define TIF_POLLING_NRFLAG 14
200
201 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
202 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
203 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
204 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
205 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
206 #define _TIF_32BIT (1<<TIF_32BIT)
207 #define _TIF_NOHZ (1<<TIF_NOHZ)
208 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
209 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
210 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
211 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
212
213 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
214 _TIF_DO_NOTIFY_RESUME_MASK | \
215 _TIF_NEED_RESCHED)
216 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
217
218 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
219
220 /*
221 * Thread-synchronous status.
222 *
223 * This is different from the flags in that nobody else
224 * ever touches our thread-synchronous status, so we don't
225 * have to worry about atomic accesses.
226 *
227 * Note that there are only 8 bits available.
228 */
229 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
230
231 #ifndef __ASSEMBLY__
232 #define HAVE_SET_RESTORE_SIGMASK 1
set_restore_sigmask(void)233 static inline void set_restore_sigmask(void)
234 {
235 struct thread_info *ti = current_thread_info();
236 ti->status |= TS_RESTORE_SIGMASK;
237 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
238 }
clear_restore_sigmask(void)239 static inline void clear_restore_sigmask(void)
240 {
241 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
242 }
test_restore_sigmask(void)243 static inline bool test_restore_sigmask(void)
244 {
245 return current_thread_info()->status & TS_RESTORE_SIGMASK;
246 }
test_and_clear_restore_sigmask(void)247 static inline bool test_and_clear_restore_sigmask(void)
248 {
249 struct thread_info *ti = current_thread_info();
250 if (!(ti->status & TS_RESTORE_SIGMASK))
251 return false;
252 ti->status &= ~TS_RESTORE_SIGMASK;
253 return true;
254 }
255
256 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
257 #define test_thread_64bit_stack(__SP) \
258 ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
259 false : true)
260
261 #endif /* !__ASSEMBLY__ */
262
263 #endif /* __KERNEL__ */
264
265 #endif /* _ASM_THREAD_INFO_H */
266