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 #define init_thread_info (init_thread_union.thread_info) 124 #define init_stack (init_thread_union.stack) 125 126 /* how to get the thread information struct from C */ 127 register struct thread_info *current_thread_info_reg asm("g6"); 128 #define current_thread_info() (current_thread_info_reg) 129 130 /* thread information allocation */ 131 #if PAGE_SHIFT == 13 132 #define THREAD_SIZE_ORDER 1 133 #else /* PAGE_SHIFT == 13 */ 134 #define THREAD_SIZE_ORDER 0 135 #endif /* PAGE_SHIFT == 13 */ 136 137 #define __thread_flag_byte_ptr(ti) \ 138 ((unsigned char *)(&((ti)->flags))) 139 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info()) 140 141 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE]) 142 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val)) 143 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE]) 144 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val)) 145 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP]) 146 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val)) 147 #define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR]) 148 #define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val)) 149 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH]) 150 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val)) 151 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED]) 152 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val)) 153 #endif /* !(__ASSEMBLY__) */ 154 155 /* 156 * Thread information flags, only 16 bits are available as we encode 157 * other values into the upper 6 bytes. 158 * 159 * On trap return we need to test several values: 160 * 161 * user: need_resched, notify_resume, sigpending, wsaved 162 * kernel: fpdepth 163 * 164 * So to check for work in the kernel case we simply load the fpdepth 165 * byte out of the flags and test it. For the user case we encode the 166 * lower 3 bytes of flags as follows: 167 * ---------------------------------------- 168 * | wsaved | flags byte 1 | flags byte 2 | 169 * ---------------------------------------- 170 * This optimizes the user test into: 171 * ldx [%g6 + TI_FLAGS], REG1 172 * sethi %hi(_TIF_USER_WORK_MASK), REG2 173 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2 174 * andcc REG1, REG2, %g0 175 * be,pt no_work_to_do 176 * nop 177 */ 178 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 179 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 180 #define TIF_SIGPENDING 2 /* signal pending */ 181 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 182 /* flag bit 4 is available */ 183 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */ 184 #define TIF_UPROBE 6 /* breakpointed or singlestepped */ 185 #define TIF_32BIT 7 /* 32-bit binary */ 186 #define TIF_NOHZ 8 /* in adaptive nohz mode */ 187 #define TIF_SECCOMP 9 /* secure computing */ 188 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */ 189 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 190 /* NOTE: Thread flags >= 12 should be ones we have no interest 191 * in using in assembly, else we can't use the mask as 192 * an immediate value in instructions such as andcc. 193 */ 194 /* flag bit 12 is available */ 195 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */ 196 #define TIF_POLLING_NRFLAG 14 197 198 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 199 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 200 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 201 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 202 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED) 203 #define _TIF_UPROBE (1<<TIF_UPROBE) 204 #define _TIF_32BIT (1<<TIF_32BIT) 205 #define _TIF_NOHZ (1<<TIF_NOHZ) 206 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 207 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 208 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 209 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 210 211 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \ 212 _TIF_DO_NOTIFY_RESUME_MASK | \ 213 _TIF_NEED_RESCHED) 214 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \ 215 _TIF_SIGPENDING | _TIF_UPROBE) 216 217 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 218 219 /* 220 * Thread-synchronous status. 221 * 222 * This is different from the flags in that nobody else 223 * ever touches our thread-synchronous status, so we don't 224 * have to worry about atomic accesses. 225 * 226 * Note that there are only 8 bits available. 227 */ 228 229 #ifndef __ASSEMBLY__ 230 231 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0) 232 #define test_thread_64bit_stack(__SP) \ 233 ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \ 234 false : true) 235 236 #endif /* !__ASSEMBLY__ */ 237 238 #endif /* __KERNEL__ */ 239 240 #endif /* _ASM_THREAD_INFO_H */ 241