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 struct restart_block restart_block;
62
63 struct pt_regs *kern_una_regs;
64 unsigned int kern_una_insn;
65
66 unsigned long fpregs[0] __attribute__ ((aligned(64)));
67 };
68
69 #endif /* !(__ASSEMBLY__) */
70
71 /* offsets into the thread_info struct for assembly code access */
72 #define TI_TASK 0x00000000
73 #define TI_FLAGS 0x00000008
74 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
75 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
76 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
77 #define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
78 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
79 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
80 #define TI_FPSAVED 0x00000010
81 #define TI_KSP 0x00000018
82 #define TI_FAULT_ADDR 0x00000020
83 #define TI_KREGS 0x00000028
84 #define TI_EXEC_DOMAIN 0x00000030
85 #define TI_PRE_COUNT 0x00000038
86 #define TI_NEW_CHILD 0x0000003c
87 #define TI_SYS_NOERROR 0x0000003d
88 #define TI_CPU 0x0000003e
89 #define TI_UTRAPS 0x00000040
90 #define TI_REG_WINDOW 0x00000048
91 #define TI_RWIN_SPTRS 0x000003c8
92 #define TI_GSR 0x00000400
93 #define TI_XFSR 0x00000438
94 #define TI_RESTART_BLOCK 0x00000470
95 #define TI_KUNA_REGS 0x000004a0
96 #define TI_KUNA_INSN 0x000004a8
97 #define TI_FPREGS 0x000004c0
98
99 /* We embed this in the uppermost byte of thread_info->flags */
100 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
101 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
102 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
103 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
104 #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
105
106 #if PAGE_SHIFT == 13
107 #define THREAD_SIZE (2*PAGE_SIZE)
108 #define THREAD_SHIFT (PAGE_SHIFT + 1)
109 #else /* PAGE_SHIFT == 13 */
110 #define THREAD_SIZE PAGE_SIZE
111 #define THREAD_SHIFT PAGE_SHIFT
112 #endif /* PAGE_SHIFT == 13 */
113
114 #define PREEMPT_ACTIVE 0x10000000
115
116 /*
117 * macros/functions for gaining access to the thread information structure
118 */
119 #ifndef __ASSEMBLY__
120
121 #define INIT_THREAD_INFO(tsk) \
122 { \
123 .task = &tsk, \
124 .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
125 .exec_domain = &default_exec_domain, \
126 .preempt_count = INIT_PREEMPT_COUNT, \
127 .restart_block = { \
128 .fn = do_no_restart_syscall, \
129 }, \
130 }
131
132 #define init_thread_info (init_thread_union.thread_info)
133 #define init_stack (init_thread_union.stack)
134
135 /* how to get the thread information struct from C */
136 register struct thread_info *current_thread_info_reg asm("g6");
137 #define current_thread_info() (current_thread_info_reg)
138
139 /* thread information allocation */
140 #if PAGE_SHIFT == 13
141 #define __THREAD_INFO_ORDER 1
142 #else /* PAGE_SHIFT == 13 */
143 #define __THREAD_INFO_ORDER 0
144 #endif /* PAGE_SHIFT == 13 */
145
146 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
147
148 #ifdef CONFIG_DEBUG_STACK_USAGE
149 #define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
150 #else
151 #define THREAD_FLAGS (GFP_KERNEL)
152 #endif
153
154 #define alloc_thread_info_node(tsk, node) \
155 ({ \
156 struct page *page = alloc_pages_node(node, THREAD_FLAGS, \
157 __THREAD_INFO_ORDER); \
158 struct thread_info *ret; \
159 \
160 ret = page ? page_address(page) : NULL; \
161 ret; \
162 })
163
164 #define free_thread_info(ti) \
165 free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
166
167 #define __thread_flag_byte_ptr(ti) \
168 ((unsigned char *)(&((ti)->flags)))
169 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
170
171 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
172 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
173 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
174 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
175 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
176 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
177 #define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
178 #define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
179 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
180 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
181 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
182 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
183
184 #endif /* !(__ASSEMBLY__) */
185
186 /*
187 * Thread information flags, only 16 bits are available as we encode
188 * other values into the upper 6 bytes.
189 *
190 * On trap return we need to test several values:
191 *
192 * user: need_resched, notify_resume, sigpending, wsaved
193 * kernel: fpdepth
194 *
195 * So to check for work in the kernel case we simply load the fpdepth
196 * byte out of the flags and test it. For the user case we encode the
197 * lower 3 bytes of flags as follows:
198 * ----------------------------------------
199 * | wsaved | flags byte 1 | flags byte 2 |
200 * ----------------------------------------
201 * This optimizes the user test into:
202 * ldx [%g6 + TI_FLAGS], REG1
203 * sethi %hi(_TIF_USER_WORK_MASK), REG2
204 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
205 * andcc REG1, REG2, %g0
206 * be,pt no_work_to_do
207 * nop
208 */
209 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
210 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
211 #define TIF_SIGPENDING 2 /* signal pending */
212 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
213 /* flag bit 4 is available */
214 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
215 /* flag bit 6 is available */
216 #define TIF_32BIT 7 /* 32-bit binary */
217 /* flag bit 8 is available */
218 #define TIF_SECCOMP 9 /* secure computing */
219 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
220 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
221 /* NOTE: Thread flags >= 12 should be ones we have no interest
222 * in using in assembly, else we can't use the mask as
223 * an immediate value in instructions such as andcc.
224 */
225 /* flag bit 12 is available */
226 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */
227 #define TIF_POLLING_NRFLAG 14
228
229 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
230 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
231 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
232 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
233 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
234 #define _TIF_32BIT (1<<TIF_32BIT)
235 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
236 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
237 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
238 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
239
240 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
241 _TIF_DO_NOTIFY_RESUME_MASK | \
242 _TIF_NEED_RESCHED)
243 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
244
245 /*
246 * Thread-synchronous status.
247 *
248 * This is different from the flags in that nobody else
249 * ever touches our thread-synchronous status, so we don't
250 * have to worry about atomic accesses.
251 *
252 * Note that there are only 8 bits available.
253 */
254 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
255
256 #ifndef __ASSEMBLY__
257 #define HAVE_SET_RESTORE_SIGMASK 1
set_restore_sigmask(void)258 static inline void set_restore_sigmask(void)
259 {
260 struct thread_info *ti = current_thread_info();
261 ti->status |= TS_RESTORE_SIGMASK;
262 set_bit(TIF_SIGPENDING, &ti->flags);
263 }
264 #endif /* !__ASSEMBLY__ */
265
266 #endif /* __KERNEL__ */
267
268 #endif /* _ASM_THREAD_INFO_H */
269