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
35 struct thread_info {
36 /* D$ line 1 */
37 struct task_struct *task;
38 unsigned long flags;
39 __u8 fpsaved[7];
40 __u8 status;
41 unsigned long ksp;
42
43 /* D$ line 2 */
44 unsigned long fault_address;
45 struct pt_regs *kregs;
46 int preempt_count; /* 0 => preemptable, <0 => BUG */
47 __u8 new_child;
48 __u8 current_ds;
49 __u16 cpu;
50
51 unsigned long *utraps;
52
53 struct reg_window reg_window[NSWINS];
54 unsigned long rwbuf_stkptrs[NSWINS];
55
56 unsigned long gsr[7];
57 unsigned long xfsr[7];
58
59 struct pt_regs *kern_una_regs;
60 unsigned int kern_una_insn;
61
62 unsigned long fpregs[(7 * 256) / sizeof(unsigned long)]
63 __attribute__ ((aligned(64)));
64 };
65
66 #endif /* !(__ASSEMBLY__) */
67
68 /* offsets into the thread_info struct for assembly code access */
69 #define TI_TASK 0x00000000
70 #define TI_FLAGS 0x00000008
71 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
72 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
73 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
74 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
75 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
76 #define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
77 #define TI_FPSAVED 0x00000010
78 #define TI_KSP 0x00000018
79 #define TI_FAULT_ADDR 0x00000020
80 #define TI_KREGS 0x00000028
81 #define TI_PRE_COUNT 0x00000030
82 #define TI_NEW_CHILD 0x00000034
83 #define TI_CURRENT_DS 0x00000035
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 .current_ds = ASI_P, \
119 .preempt_count = INIT_PREEMPT_COUNT, \
120 }
121
122 #define init_thread_info (init_thread_union.thread_info)
123 #define init_stack (init_thread_union.stack)
124
125 /* how to get the thread information struct from C */
126 register struct thread_info *current_thread_info_reg asm("g6");
127 #define current_thread_info() (current_thread_info_reg)
128
129 /* thread information allocation */
130 #if PAGE_SHIFT == 13
131 #define THREAD_SIZE_ORDER 1
132 #else /* PAGE_SHIFT == 13 */
133 #define THREAD_SIZE_ORDER 0
134 #endif /* PAGE_SHIFT == 13 */
135
136 #define __thread_flag_byte_ptr(ti) \
137 ((unsigned char *)(&((ti)->flags)))
138 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
139
140 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
141 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
142 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
143 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
144 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
145 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
146 #define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
147 #define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
148 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
149 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
150 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
151 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
152 #endif /* !(__ASSEMBLY__) */
153
154 /*
155 * Thread information flags, only 16 bits are available as we encode
156 * other values into the upper 6 bytes.
157 *
158 * On trap return we need to test several values:
159 *
160 * user: need_resched, notify_resume, sigpending, wsaved
161 * kernel: fpdepth
162 *
163 * So to check for work in the kernel case we simply load the fpdepth
164 * byte out of the flags and test it. For the user case we encode the
165 * lower 3 bytes of flags as follows:
166 * ----------------------------------------
167 * | wsaved | flags byte 1 | flags byte 2 |
168 * ----------------------------------------
169 * This optimizes the user test into:
170 * ldx [%g6 + TI_FLAGS], REG1
171 * sethi %hi(_TIF_USER_WORK_MASK), REG2
172 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
173 * andcc REG1, REG2, %g0
174 * be,pt no_work_to_do
175 * nop
176 */
177 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
178 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
179 #define TIF_SIGPENDING 2 /* signal pending */
180 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
181 /* flag bit 4 is available */
182 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
183 /* flag bit 6 is available */
184 #define TIF_32BIT 7 /* 32-bit binary */
185 #define TIF_NOHZ 8 /* in adaptive nohz mode */
186 #define TIF_SECCOMP 9 /* secure computing */
187 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
188 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
189 /* NOTE: Thread flags >= 12 should be ones we have no interest
190 * in using in assembly, else we can't use the mask as
191 * an immediate value in instructions such as andcc.
192 */
193 /* flag bit 12 is available */
194 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */
195 #define TIF_POLLING_NRFLAG 14
196
197 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
198 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
199 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
200 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
201 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
202 #define _TIF_32BIT (1<<TIF_32BIT)
203 #define _TIF_NOHZ (1<<TIF_NOHZ)
204 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
205 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
206 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
207 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
208
209 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
210 _TIF_DO_NOTIFY_RESUME_MASK | \
211 _TIF_NEED_RESCHED)
212 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
213
214 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
215
216 /*
217 * Thread-synchronous status.
218 *
219 * This is different from the flags in that nobody else
220 * ever touches our thread-synchronous status, so we don't
221 * have to worry about atomic accesses.
222 *
223 * Note that there are only 8 bits available.
224 */
225 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
226
227 #ifndef __ASSEMBLY__
228 #define HAVE_SET_RESTORE_SIGMASK 1
set_restore_sigmask(void)229 static inline void set_restore_sigmask(void)
230 {
231 struct thread_info *ti = current_thread_info();
232 ti->status |= TS_RESTORE_SIGMASK;
233 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
234 }
clear_restore_sigmask(void)235 static inline void clear_restore_sigmask(void)
236 {
237 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
238 }
test_restore_sigmask(void)239 static inline bool test_restore_sigmask(void)
240 {
241 return current_thread_info()->status & TS_RESTORE_SIGMASK;
242 }
test_and_clear_restore_sigmask(void)243 static inline bool test_and_clear_restore_sigmask(void)
244 {
245 struct thread_info *ti = current_thread_info();
246 if (!(ti->status & TS_RESTORE_SIGMASK))
247 return false;
248 ti->status &= ~TS_RESTORE_SIGMASK;
249 return true;
250 }
251
252 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
253 #define test_thread_64bit_stack(__SP) \
254 ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
255 false : true)
256
257 #endif /* !__ASSEMBLY__ */
258
259 #endif /* __KERNEL__ */
260
261 #endif /* _ASM_THREAD_INFO_H */
262