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 1 229 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 } 235 static inline void clear_restore_sigmask(void) 236 { 237 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 238 } 239 static inline bool test_restore_sigmask(void) 240 { 241 return current_thread_info()->status & TS_RESTORE_SIGMASK; 242 } 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