1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* thread_info.h: sparc64 low-level thread information
3  *
4  * Copyright (C) 2002  David S. Miller (davem@redhat.com)
5  */
6 
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
9 
10 #ifdef __KERNEL__
11 
12 #define NSWINS		7
13 
14 #define TI_FLAG_BYTE_FAULT_CODE		0
15 #define TI_FLAG_FAULT_CODE_SHIFT	56
16 #define TI_FLAG_BYTE_WSTATE		1
17 #define TI_FLAG_WSTATE_SHIFT		48
18 #define TI_FLAG_BYTE_NOERROR		2
19 #define TI_FLAG_BYTE_NOERROR_SHIFT	40
20 #define TI_FLAG_BYTE_FPDEPTH		3
21 #define TI_FLAG_FPDEPTH_SHIFT		32
22 #define TI_FLAG_BYTE_CWP		4
23 #define TI_FLAG_CWP_SHIFT		24
24 #define TI_FLAG_BYTE_WSAVED		5
25 #define TI_FLAG_WSAVED_SHIFT		16
26 
27 #include <asm/page.h>
28 
29 #ifndef __ASSEMBLY__
30 
31 #include <asm/ptrace.h>
32 #include <asm/types.h>
33 
34 struct task_struct;
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 	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
48 	__u8			new_child;
49 	__u8			current_ds;
50 	__u16			cpu;
51 
52 	unsigned long		*utraps;
53 
54 	struct reg_window 	reg_window[NSWINS];
55 	unsigned long 		rwbuf_stkptrs[NSWINS];
56 
57 	unsigned long		gsr[7];
58 	unsigned long		xfsr[7];
59 
60 	struct pt_regs		*kern_una_regs;
61 	unsigned int		kern_una_insn;
62 
63 	unsigned long		fpregs[(7 * 256) / sizeof(unsigned long)]
64 		__attribute__ ((aligned(64)));
65 };
66 
67 #endif /* !(__ASSEMBLY__) */
68 
69 /* offsets into the thread_info struct for assembly code access */
70 #define TI_TASK		0x00000000
71 #define TI_FLAGS	0x00000008
72 #define TI_FAULT_CODE	(TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
73 #define TI_WSTATE	(TI_FLAGS + TI_FLAG_BYTE_WSTATE)
74 #define TI_CWP		(TI_FLAGS + TI_FLAG_BYTE_CWP)
75 #define TI_FPDEPTH	(TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
76 #define TI_WSAVED	(TI_FLAGS + TI_FLAG_BYTE_WSAVED)
77 #define TI_SYS_NOERROR	(TI_FLAGS + TI_FLAG_BYTE_NOERROR)
78 #define TI_FPSAVED	0x00000010
79 #define TI_KSP		0x00000018
80 #define TI_FAULT_ADDR	0x00000020
81 #define TI_KREGS	0x00000028
82 #define TI_PRE_COUNT	0x00000030
83 #define TI_NEW_CHILD	0x00000034
84 #define TI_CURRENT_DS	0x00000035
85 #define TI_CPU		0x00000036
86 #define TI_UTRAPS	0x00000038
87 #define TI_REG_WINDOW	0x00000040
88 #define TI_RWIN_SPTRS	0x000003c0
89 #define TI_GSR		0x000003f8
90 #define TI_XFSR		0x00000430
91 #define TI_KUNA_REGS	0x00000468
92 #define TI_KUNA_INSN	0x00000470
93 #define TI_FPREGS	0x00000480
94 
95 /* We embed this in the uppermost byte of thread_info->flags */
96 #define FAULT_CODE_WRITE	0x01	/* Write access, implies D-TLB	   */
97 #define FAULT_CODE_DTLB		0x02	/* Miss happened in D-TLB	   */
98 #define FAULT_CODE_ITLB		0x04	/* Miss happened in I-TLB	   */
99 #define FAULT_CODE_WINFIXUP	0x08	/* Miss happened during spill/fill */
100 #define FAULT_CODE_BLKCOMMIT	0x10	/* Use blk-commit ASI in copy_page */
101 #define	FAULT_CODE_BAD_RA	0x20	/* Bad RA for sun4v		   */
102 
103 #if PAGE_SHIFT == 13
104 #define THREAD_SIZE (2*PAGE_SIZE)
105 #define THREAD_SHIFT (PAGE_SHIFT + 1)
106 #else /* PAGE_SHIFT == 13 */
107 #define THREAD_SIZE PAGE_SIZE
108 #define THREAD_SHIFT PAGE_SHIFT
109 #endif /* PAGE_SHIFT == 13 */
110 
111 /*
112  * macros/functions for gaining access to the thread information structure
113  */
114 #ifndef __ASSEMBLY__
115 
116 #define INIT_THREAD_INFO(tsk)				\
117 {							\
118 	.task		=	&tsk,			\
119 	.current_ds	=	ASI_P,			\
120 	.preempt_count	=	INIT_PREEMPT_COUNT,	\
121 }
122 
123 /* how to get the thread information struct from C */
124 register struct thread_info *current_thread_info_reg asm("g6");
125 #define current_thread_info()	(current_thread_info_reg)
126 
127 /* thread information allocation */
128 #if PAGE_SHIFT == 13
129 #define THREAD_SIZE_ORDER	1
130 #else /* PAGE_SHIFT == 13 */
131 #define THREAD_SIZE_ORDER	0
132 #endif /* PAGE_SHIFT == 13 */
133 
134 #define __thread_flag_byte_ptr(ti)	\
135 	((unsigned char *)(&((ti)->flags)))
136 #define __cur_thread_flag_byte_ptr	__thread_flag_byte_ptr(current_thread_info())
137 
138 #define get_thread_fault_code()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
139 #define set_thread_fault_code(val)	(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
140 #define get_thread_wstate()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
141 #define set_thread_wstate(val)		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
142 #define get_thread_cwp()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
143 #define set_thread_cwp(val)		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
144 #define get_thread_noerror()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
145 #define set_thread_noerror(val)		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
146 #define get_thread_fpdepth()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
147 #define set_thread_fpdepth(val)		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
148 #define get_thread_wsaved()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
149 #define set_thread_wsaved(val)		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
150 #endif /* !(__ASSEMBLY__) */
151 
152 /*
153  * Thread information flags, only 16 bits are available as we encode
154  * other values into the upper 6 bytes.
155  *
156  * On trap return we need to test several values:
157  *
158  * user:	need_resched, notify_resume, sigpending, wsaved
159  * kernel:	fpdepth
160  *
161  * So to check for work in the kernel case we simply load the fpdepth
162  * byte out of the flags and test it.  For the user case we encode the
163  * lower 3 bytes of flags as follows:
164  *	----------------------------------------
165  *	| wsaved | flags byte 1 | flags byte 2 |
166  *	----------------------------------------
167  * This optimizes the user test into:
168  *	ldx		[%g6 + TI_FLAGS], REG1
169  *	sethi		%hi(_TIF_USER_WORK_MASK), REG2
170  *	or		REG2, %lo(_TIF_USER_WORK_MASK), REG2
171  *	andcc		REG1, REG2, %g0
172  *	be,pt		no_work_to_do
173  *	 nop
174  */
175 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
176 #define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
177 #define TIF_SIGPENDING		2	/* signal pending */
178 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
179 /* flag bit 4 is available */
180 #define TIF_UNALIGNED		5	/* allowed to do unaligned accesses */
181 #define TIF_UPROBE		6	/* breakpointed or singlestepped */
182 #define TIF_32BIT		7	/* 32-bit binary */
183 #define TIF_NOHZ		8	/* in adaptive nohz mode */
184 #define TIF_SECCOMP		9	/* secure computing */
185 #define TIF_SYSCALL_AUDIT	10	/* syscall auditing active */
186 #define TIF_SYSCALL_TRACEPOINT	11	/* syscall tracepoint instrumentation */
187 /* NOTE: Thread flags >= 12 should be ones we have no interest
188  *       in using in assembly, else we can't use the mask as
189  *       an immediate value in instructions such as andcc.
190  */
191 /* flag bit 12 is available */
192 #define TIF_MEMDIE		13	/* is terminating due to OOM killer */
193 #define TIF_POLLING_NRFLAG	14
194 
195 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
196 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
197 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
198 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
199 #define _TIF_UNALIGNED		(1<<TIF_UNALIGNED)
200 #define _TIF_UPROBE		(1<<TIF_UPROBE)
201 #define _TIF_32BIT		(1<<TIF_32BIT)
202 #define _TIF_NOHZ		(1<<TIF_NOHZ)
203 #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
204 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
205 #define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
206 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
207 
208 #define _TIF_USER_WORK_MASK	((0xff << TI_FLAG_WSAVED_SHIFT) | \
209 				 _TIF_DO_NOTIFY_RESUME_MASK | \
210 				 _TIF_NEED_RESCHED)
211 #define _TIF_DO_NOTIFY_RESUME_MASK	(_TIF_NOTIFY_RESUME | \
212 					 _TIF_SIGPENDING | _TIF_UPROBE)
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 
226 #ifndef __ASSEMBLY__
227 
228 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
229 #define test_thread_64bit_stack(__SP) \
230 	((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
231 	 false : true)
232 
233 #endif	/* !__ASSEMBLY__ */
234 
235 #endif /* __KERNEL__ */
236 
237 #endif /* _ASM_THREAD_INFO_H */
238