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 33struct task_struct; 34 35struct 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 */ 126register 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 229static 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} 235static inline void clear_restore_sigmask(void) 236{ 237 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 238} 239static inline bool test_restore_sigmask(void) 240{ 241 return current_thread_info()->status & TS_RESTORE_SIGMASK; 242} 243static 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