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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