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 33 struct task_struct; 34 struct exec_domain; 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 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 struct restart_block restart_block; 62 63 struct pt_regs *kern_una_regs; 64 unsigned int kern_una_insn; 65 66 unsigned long fpregs[0] __attribute__ ((aligned(64))); 67 }; 68 69 #endif /* !(__ASSEMBLY__) */ 70 71 /* offsets into the thread_info struct for assembly code access */ 72 #define TI_TASK 0x00000000 73 #define TI_FLAGS 0x00000008 74 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE) 75 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE) 76 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP) 77 #define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS) 78 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH) 79 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED) 80 #define TI_FPSAVED 0x00000010 81 #define TI_KSP 0x00000018 82 #define TI_FAULT_ADDR 0x00000020 83 #define TI_KREGS 0x00000028 84 #define TI_EXEC_DOMAIN 0x00000030 85 #define TI_PRE_COUNT 0x00000038 86 #define TI_NEW_CHILD 0x0000003c 87 #define TI_SYS_NOERROR 0x0000003d 88 #define TI_CPU 0x0000003e 89 #define TI_UTRAPS 0x00000040 90 #define TI_REG_WINDOW 0x00000048 91 #define TI_RWIN_SPTRS 0x000003c8 92 #define TI_GSR 0x00000400 93 #define TI_XFSR 0x00000438 94 #define TI_RESTART_BLOCK 0x00000470 95 #define TI_KUNA_REGS 0x000004a0 96 #define TI_KUNA_INSN 0x000004a8 97 #define TI_FPREGS 0x000004c0 98 99 /* We embed this in the uppermost byte of thread_info->flags */ 100 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */ 101 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */ 102 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */ 103 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */ 104 #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */ 105 106 #if PAGE_SHIFT == 13 107 #define THREAD_SIZE (2*PAGE_SIZE) 108 #define THREAD_SHIFT (PAGE_SHIFT + 1) 109 #else /* PAGE_SHIFT == 13 */ 110 #define THREAD_SIZE PAGE_SIZE 111 #define THREAD_SHIFT PAGE_SHIFT 112 #endif /* PAGE_SHIFT == 13 */ 113 114 #define PREEMPT_ACTIVE 0x10000000 115 116 /* 117 * macros/functions for gaining access to the thread information structure 118 */ 119 #ifndef __ASSEMBLY__ 120 121 #define INIT_THREAD_INFO(tsk) \ 122 { \ 123 .task = &tsk, \ 124 .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \ 125 .exec_domain = &default_exec_domain, \ 126 .preempt_count = INIT_PREEMPT_COUNT, \ 127 .restart_block = { \ 128 .fn = do_no_restart_syscall, \ 129 }, \ 130 } 131 132 #define init_thread_info (init_thread_union.thread_info) 133 #define init_stack (init_thread_union.stack) 134 135 /* how to get the thread information struct from C */ 136 register struct thread_info *current_thread_info_reg asm("g6"); 137 #define current_thread_info() (current_thread_info_reg) 138 139 /* thread information allocation */ 140 #if PAGE_SHIFT == 13 141 #define __THREAD_INFO_ORDER 1 142 #else /* PAGE_SHIFT == 13 */ 143 #define __THREAD_INFO_ORDER 0 144 #endif /* PAGE_SHIFT == 13 */ 145 146 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 147 148 #ifdef CONFIG_DEBUG_STACK_USAGE 149 #define alloc_thread_info(tsk) \ 150 ({ \ 151 struct thread_info *ret; \ 152 \ 153 ret = (struct thread_info *) \ 154 __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \ 155 if (ret) \ 156 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \ 157 ret; \ 158 }) 159 #else 160 #define alloc_thread_info(tsk) \ 161 ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER)) 162 #endif 163 164 #define free_thread_info(ti) \ 165 free_pages((unsigned long)(ti),__THREAD_INFO_ORDER) 166 167 #define __thread_flag_byte_ptr(ti) \ 168 ((unsigned char *)(&((ti)->flags))) 169 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info()) 170 171 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE]) 172 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val)) 173 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE]) 174 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val)) 175 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP]) 176 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val)) 177 #define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS]) 178 #define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val)) 179 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH]) 180 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val)) 181 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED]) 182 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val)) 183 184 #endif /* !(__ASSEMBLY__) */ 185 186 /* 187 * Thread information flags, only 16 bits are available as we encode 188 * other values into the upper 6 bytes. 189 * 190 * On trap return we need to test several values: 191 * 192 * user: need_resched, notify_resume, sigpending, wsaved 193 * kernel: fpdepth 194 * 195 * So to check for work in the kernel case we simply load the fpdepth 196 * byte out of the flags and test it. For the user case we encode the 197 * lower 3 bytes of flags as follows: 198 * ---------------------------------------- 199 * | wsaved | flags byte 1 | flags byte 2 | 200 * ---------------------------------------- 201 * This optimizes the user test into: 202 * ldx [%g6 + TI_FLAGS], REG1 203 * sethi %hi(_TIF_USER_WORK_MASK), REG2 204 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2 205 * andcc REG1, REG2, %g0 206 * be,pt no_work_to_do 207 * nop 208 */ 209 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 210 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 211 #define TIF_SIGPENDING 2 /* signal pending */ 212 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 213 /* flag bit 4 is available */ 214 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */ 215 /* flag bit 6 is available */ 216 #define TIF_32BIT 7 /* 32-bit binary */ 217 /* flag bit 8 is available */ 218 #define TIF_SECCOMP 9 /* secure computing */ 219 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */ 220 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 221 /* NOTE: Thread flags >= 12 should be ones we have no interest 222 * in using in assembly, else we can't use the mask as 223 * an immediate value in instructions such as andcc. 224 */ 225 /* flag bit 12 is available */ 226 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */ 227 #define TIF_POLLING_NRFLAG 14 228 #define TIF_FREEZE 15 /* is freezing for suspend */ 229 230 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 231 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 232 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 233 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 234 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED) 235 #define _TIF_32BIT (1<<TIF_32BIT) 236 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 237 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 238 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 239 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 240 #define _TIF_FREEZE (1<<TIF_FREEZE) 241 242 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \ 243 _TIF_DO_NOTIFY_RESUME_MASK | \ 244 _TIF_NEED_RESCHED) 245 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING) 246 247 /* 248 * Thread-synchronous status. 249 * 250 * This is different from the flags in that nobody else 251 * ever touches our thread-synchronous status, so we don't 252 * have to worry about atomic accesses. 253 * 254 * Note that there are only 8 bits available. 255 */ 256 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */ 257 258 #ifndef __ASSEMBLY__ 259 #define HAVE_SET_RESTORE_SIGMASK 1 260 static inline void set_restore_sigmask(void) 261 { 262 struct thread_info *ti = current_thread_info(); 263 ti->status |= TS_RESTORE_SIGMASK; 264 set_bit(TIF_SIGPENDING, &ti->flags); 265 } 266 #endif /* !__ASSEMBLY__ */ 267 268 #endif /* __KERNEL__ */ 269 270 #endif /* _ASM_THREAD_INFO_H */ 271