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_CWP 2
18 #define TI_FLAG_CWP_SHIFT 40
19 #define TI_FLAG_BYTE_CURRENT_DS 3
20 #define TI_FLAG_CURRENT_DS_SHIFT 32
21 #define TI_FLAG_BYTE_FPDEPTH 4
22 #define TI_FLAG_FPDEPTH_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 syscall_noerror;
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 __u64 __user *user_cntd0;
62 __u64 __user *user_cntd1;
63 __u64 kernel_cntd0, kernel_cntd1;
64 __u64 pcr_reg;
65
66 struct restart_block restart_block;
67
68 struct pt_regs *kern_una_regs;
69 unsigned int kern_una_insn;
70
71 unsigned long fpregs[0] __attribute__ ((aligned(64)));
72 };
73
74 #endif /* !(__ASSEMBLY__) */
75
76 /* offsets into the thread_info struct for assembly code access */
77 #define TI_TASK 0x00000000
78 #define TI_FLAGS 0x00000008
79 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
80 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
81 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
82 #define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
83 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
84 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
85 #define TI_FPSAVED 0x00000010
86 #define TI_KSP 0x00000018
87 #define TI_FAULT_ADDR 0x00000020
88 #define TI_KREGS 0x00000028
89 #define TI_EXEC_DOMAIN 0x00000030
90 #define TI_PRE_COUNT 0x00000038
91 #define TI_NEW_CHILD 0x0000003c
92 #define TI_SYS_NOERROR 0x0000003d
93 #define TI_CPU 0x0000003e
94 #define TI_UTRAPS 0x00000040
95 #define TI_REG_WINDOW 0x00000048
96 #define TI_RWIN_SPTRS 0x000003c8
97 #define TI_GSR 0x00000400
98 #define TI_XFSR 0x00000438
99 #define TI_USER_CNTD0 0x00000470
100 #define TI_USER_CNTD1 0x00000478
101 #define TI_KERN_CNTD0 0x00000480
102 #define TI_KERN_CNTD1 0x00000488
103 #define TI_PCR 0x00000490
104 #define TI_RESTART_BLOCK 0x00000498
105 #define TI_KUNA_REGS 0x000004c0
106 #define TI_KUNA_INSN 0x000004c8
107 #define TI_FPREGS 0x00000500
108
109 /* We embed this in the uppermost byte of thread_info->flags */
110 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
111 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
112 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
113 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
114 #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
115
116 #if PAGE_SHIFT == 13
117 #define THREAD_SIZE (2*PAGE_SIZE)
118 #define THREAD_SHIFT (PAGE_SHIFT + 1)
119 #else /* PAGE_SHIFT == 13 */
120 #define THREAD_SIZE PAGE_SIZE
121 #define THREAD_SHIFT PAGE_SHIFT
122 #endif /* PAGE_SHIFT == 13 */
123
124 #define PREEMPT_ACTIVE 0x4000000
125
126 /*
127 * macros/functions for gaining access to the thread information structure
128 *
129 * preempt_count needs to be 1 initially, until the scheduler is functional.
130 */
131 #ifndef __ASSEMBLY__
132
133 #define INIT_THREAD_INFO(tsk) \
134 { \
135 .task = &tsk, \
136 .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
137 .exec_domain = &default_exec_domain, \
138 .preempt_count = 1, \
139 .restart_block = { \
140 .fn = do_no_restart_syscall, \
141 }, \
142 }
143
144 #define init_thread_info (init_thread_union.thread_info)
145 #define init_stack (init_thread_union.stack)
146
147 /* how to get the thread information struct from C */
148 register struct thread_info *current_thread_info_reg asm("g6");
149 #define current_thread_info() (current_thread_info_reg)
150
151 /* thread information allocation */
152 #if PAGE_SHIFT == 13
153 #define __THREAD_INFO_ORDER 1
154 #else /* PAGE_SHIFT == 13 */
155 #define __THREAD_INFO_ORDER 0
156 #endif /* PAGE_SHIFT == 13 */
157
158 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
159
160 #ifdef CONFIG_DEBUG_STACK_USAGE
161 #define alloc_thread_info(tsk) \
162 ({ \
163 struct thread_info *ret; \
164 \
165 ret = (struct thread_info *) \
166 __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \
167 if (ret) \
168 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
169 ret; \
170 })
171 #else
172 #define alloc_thread_info(tsk) \
173 ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
174 #endif
175
176 #define free_thread_info(ti) \
177 free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
178
179 #define __thread_flag_byte_ptr(ti) \
180 ((unsigned char *)(&((ti)->flags)))
181 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
182
183 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
184 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
185 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
186 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
187 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
188 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
189 #define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
190 #define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
191 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
192 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
193 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
194 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
195
196 #endif /* !(__ASSEMBLY__) */
197
198 /*
199 * Thread information flags, only 16 bits are available as we encode
200 * other values into the upper 6 bytes.
201 *
202 * On trap return we need to test several values:
203 *
204 * user: need_resched, notify_resume, sigpending, wsaved, perfctr
205 * kernel: fpdepth
206 *
207 * So to check for work in the kernel case we simply load the fpdepth
208 * byte out of the flags and test it. For the user case we encode the
209 * lower 3 bytes of flags as follows:
210 * ----------------------------------------
211 * | wsaved | flags byte 1 | flags byte 2 |
212 * ----------------------------------------
213 * This optimizes the user test into:
214 * ldx [%g6 + TI_FLAGS], REG1
215 * sethi %hi(_TIF_USER_WORK_MASK), REG2
216 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
217 * andcc REG1, REG2, %g0
218 * be,pt no_work_to_do
219 * nop
220 */
221 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
222 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
223 #define TIF_SIGPENDING 2 /* signal pending */
224 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
225 #define TIF_PERFCTR 4 /* performance counters active */
226 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
227 /* flag bit 6 is available */
228 #define TIF_32BIT 7 /* 32-bit binary */
229 /* flag bit 8 is available */
230 #define TIF_SECCOMP 9 /* secure computing */
231 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
232 /* flag bit 11 is available */
233 /* NOTE: Thread flags >= 12 should be ones we have no interest
234 * in using in assembly, else we can't use the mask as
235 * an immediate value in instructions such as andcc.
236 */
237 #define TIF_ABI_PENDING 12
238 #define TIF_MEMDIE 13
239 #define TIF_POLLING_NRFLAG 14
240 #define TIF_FREEZE 15 /* is freezing for suspend */
241
242 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
243 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
244 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
245 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
246 #define _TIF_PERFCTR (1<<TIF_PERFCTR)
247 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
248 #define _TIF_32BIT (1<<TIF_32BIT)
249 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
250 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
251 #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
252 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
253 #define _TIF_FREEZE (1<<TIF_FREEZE)
254
255 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
256 _TIF_DO_NOTIFY_RESUME_MASK | \
257 _TIF_NEED_RESCHED | _TIF_PERFCTR)
258 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
259
260 /*
261 * Thread-synchronous status.
262 *
263 * This is different from the flags in that nobody else
264 * ever touches our thread-synchronous status, so we don't
265 * have to worry about atomic accesses.
266 *
267 * Note that there are only 8 bits available.
268 */
269 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
270
271 #ifndef __ASSEMBLY__
272 #define HAVE_SET_RESTORE_SIGMASK 1
set_restore_sigmask(void)273 static inline void set_restore_sigmask(void)
274 {
275 struct thread_info *ti = current_thread_info();
276 ti->status |= TS_RESTORE_SIGMASK;
277 set_bit(TIF_SIGPENDING, &ti->flags);
278 }
279 #endif /* !__ASSEMBLY__ */
280
281 #endif /* __KERNEL__ */
282
283 #endif /* _ASM_THREAD_INFO_H */
284