Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
33struct task_struct;
34struct exec_domain;
35
36struct 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 */
148register 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#ifdef CONFIG_DEBUG_STACK_USAGE
159#define alloc_thread_info(tsk) \
160({ \
161 struct thread_info *ret; \
162 \
163 ret = (struct thread_info *) \
164 __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \
165 if (ret) \
166 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
167 ret; \
168})
169#else
170#define alloc_thread_info(tsk) \
171 ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
172#endif
173
174#define free_thread_info(ti) \
175 free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
176
177#define __thread_flag_byte_ptr(ti) \
178 ((unsigned char *)(&((ti)->flags)))
179#define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
180
181#define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
182#define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
183#define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
184#define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
185#define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
186#define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
187#define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
188#define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
189#define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
190#define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
191#define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
192#define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
193
194#endif /* !(__ASSEMBLY__) */
195
196/*
197 * Thread information flags, only 16 bits are available as we encode
198 * other values into the upper 6 bytes.
199 *
200 * On trap return we need to test several values:
201 *
202 * user: need_resched, notify_resume, sigpending, wsaved, perfctr
203 * kernel: fpdepth
204 *
205 * So to check for work in the kernel case we simply load the fpdepth
206 * byte out of the flags and test it. For the user case we encode the
207 * lower 3 bytes of flags as follows:
208 * ----------------------------------------
209 * | wsaved | flags byte 1 | flags byte 2 |
210 * ----------------------------------------
211 * This optimizes the user test into:
212 * ldx [%g6 + TI_FLAGS], REG1
213 * sethi %hi(_TIF_USER_WORK_MASK), REG2
214 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
215 * andcc REG1, REG2, %g0
216 * be,pt no_work_to_do
217 * nop
218 */
219#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
220/* flags bit 1 is available */
221#define TIF_SIGPENDING 2 /* signal pending */
222#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
223#define TIF_PERFCTR 4 /* performance counters active */
224#define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
225/* flag bit 6 is available */
226#define TIF_32BIT 7 /* 32-bit binary */
227/* flag bit 8 is available */
228#define TIF_SECCOMP 9 /* secure computing */
229#define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
230/* flag bit 11 is available */
231/* NOTE: Thread flags >= 12 should be ones we have no interest
232 * in using in assembly, else we can't use the mask as
233 * an immediate value in instructions such as andcc.
234 */
235#define TIF_ABI_PENDING 12
236#define TIF_MEMDIE 13
237#define TIF_POLLING_NRFLAG 14
238
239#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
240#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
241#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
242#define _TIF_PERFCTR (1<<TIF_PERFCTR)
243#define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
244#define _TIF_32BIT (1<<TIF_32BIT)
245#define _TIF_SECCOMP (1<<TIF_SECCOMP)
246#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
247#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
248#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
249
250#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
251 (_TIF_SIGPENDING | \
252 _TIF_NEED_RESCHED | _TIF_PERFCTR))
253
254/*
255 * Thread-synchronous status.
256 *
257 * This is different from the flags in that nobody else
258 * ever touches our thread-synchronous status, so we don't
259 * have to worry about atomic accesses.
260 *
261 * Note that there are only 8 bits available.
262 */
263#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
264
265#ifndef __ASSEMBLY__
266#define HAVE_SET_RESTORE_SIGMASK 1
267static inline void set_restore_sigmask(void)
268{
269 struct thread_info *ti = current_thread_info();
270 ti->status |= TS_RESTORE_SIGMASK;
271 set_bit(TIF_SIGPENDING, &ti->flags);
272}
273#endif /* !__ASSEMBLY__ */
274
275#endif /* __KERNEL__ */
276
277#endif /* _ASM_THREAD_INFO_H */