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 34struct task_struct; 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 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 .kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \ 122} 123 124/* how to get the thread information struct from C */ 125#ifndef BUILD_VDSO 126register struct thread_info *current_thread_info_reg asm("g6"); 127#define current_thread_info() (current_thread_info_reg) 128#else 129extern struct thread_info *current_thread_info(void); 130#endif 131 132/* thread information allocation */ 133#if PAGE_SHIFT == 13 134#define THREAD_SIZE_ORDER 1 135#else /* PAGE_SHIFT == 13 */ 136#define THREAD_SIZE_ORDER 0 137#endif /* PAGE_SHIFT == 13 */ 138 139#define __thread_flag_byte_ptr(ti) \ 140 ((unsigned char *)(&((ti)->flags))) 141#define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info()) 142 143#define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE]) 144#define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val)) 145#define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE]) 146#define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val)) 147#define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP]) 148#define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val)) 149#define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR]) 150#define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val)) 151#define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH]) 152#define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val)) 153#define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED]) 154#define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val)) 155#endif /* !(__ASSEMBLY__) */ 156 157/* 158 * Thread information flags, only 16 bits are available as we encode 159 * other values into the upper 6 bytes. 160 * 161 * On trap return we need to test several values: 162 * 163 * user: need_resched, notify_resume, sigpending, wsaved 164 * kernel: fpdepth 165 * 166 * So to check for work in the kernel case we simply load the fpdepth 167 * byte out of the flags and test it. For the user case we encode the 168 * lower 3 bytes of flags as follows: 169 * ---------------------------------------- 170 * | wsaved | flags byte 1 | flags byte 2 | 171 * ---------------------------------------- 172 * This optimizes the user test into: 173 * ldx [%g6 + TI_FLAGS], REG1 174 * sethi %hi(_TIF_USER_WORK_MASK), REG2 175 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2 176 * andcc REG1, REG2, %g0 177 * be,pt no_work_to_do 178 * nop 179 */ 180#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 181#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 182#define TIF_SIGPENDING 2 /* signal pending */ 183#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 184#define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */ 185#define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */ 186#define TIF_UPROBE 6 /* breakpointed or singlestepped */ 187#define TIF_32BIT 7 /* 32-bit binary */ 188#define TIF_NOHZ 8 /* in adaptive nohz mode */ 189#define TIF_SECCOMP 9 /* secure computing */ 190#define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */ 191#define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 192/* NOTE: Thread flags >= 12 should be ones we have no interest 193 * in using in assembly, else we can't use the mask as 194 * an immediate value in instructions such as andcc. 195 */ 196#define TIF_MCDPER 12 /* Precise MCD exception */ 197#define TIF_MEMDIE 13 /* is terminating due to OOM killer */ 198#define TIF_POLLING_NRFLAG 14 199 200#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 201#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 202#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 203#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 204#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 205#define _TIF_UNALIGNED (1<<TIF_UNALIGNED) 206#define _TIF_UPROBE (1<<TIF_UPROBE) 207#define _TIF_32BIT (1<<TIF_32BIT) 208#define _TIF_NOHZ (1<<TIF_NOHZ) 209#define _TIF_SECCOMP (1<<TIF_SECCOMP) 210#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 211#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 212#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 213 214#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \ 215 _TIF_DO_NOTIFY_RESUME_MASK | \ 216 _TIF_NEED_RESCHED) 217#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \ 218 _TIF_SIGPENDING | _TIF_UPROBE | \ 219 _TIF_NOTIFY_SIGNAL) 220 221#define is_32bit_task() (test_thread_flag(TIF_32BIT)) 222 223/* 224 * Thread-synchronous status. 225 * 226 * This is different from the flags in that nobody else 227 * ever touches our thread-synchronous status, so we don't 228 * have to worry about atomic accesses. 229 * 230 * Note that there are only 8 bits available. 231 */ 232 233#ifndef __ASSEMBLY__ 234 235#define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0) 236#define test_thread_64bit_stack(__SP) \ 237 ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \ 238 false : true) 239 240#endif /* !__ASSEMBLY__ */ 241 242#endif /* __KERNEL__ */ 243 244#endif /* _ASM_THREAD_INFO_H */ 245