/* SPDX-License-Identifier: GPL-2.0 */ /* thread_info.h: sparc64 low-level thread information * * Copyright (C) 2002 David S. Miller (davem@redhat.com) */ #ifndef _ASM_THREAD_INFO_H #define _ASM_THREAD_INFO_H #ifdef __KERNEL__ #define NSWINS 7 #define TI_FLAG_BYTE_FAULT_CODE 0 #define TI_FLAG_FAULT_CODE_SHIFT 56 #define TI_FLAG_BYTE_WSTATE 1 #define TI_FLAG_WSTATE_SHIFT 48 #define TI_FLAG_BYTE_NOERROR 2 #define TI_FLAG_BYTE_NOERROR_SHIFT 40 #define TI_FLAG_BYTE_FPDEPTH 3 #define TI_FLAG_FPDEPTH_SHIFT 32 #define TI_FLAG_BYTE_CWP 4 #define TI_FLAG_CWP_SHIFT 24 #define TI_FLAG_BYTE_WSAVED 5 #define TI_FLAG_WSAVED_SHIFT 16 #include <asm/page.h> #ifndef __ASSEMBLER__ #include <asm/ptrace.h> #include <asm/types.h> struct task_struct; struct thread_info { /* D$ line 1 */ struct task_struct *task; unsigned long flags; __u8 fpsaved[7]; __u8 status; unsigned long ksp; /* D$ line 2 */ unsigned long fault_address; struct pt_regs *kregs; int preempt_count; /* 0 => preemptable, <0 => BUG */ __u8 new_child; __u8 __pad; __u16 cpu; unsigned long *utraps; struct reg_window reg_window[NSWINS]; unsigned long rwbuf_stkptrs[NSWINS]; unsigned long gsr[7]; unsigned long xfsr[7]; struct pt_regs *kern_una_regs; unsigned int kern_una_insn; unsigned long fpregs[(7 * 256) / sizeof(unsigned long)] __attribute__ ((aligned(64))); }; #endif /* !(__ASSEMBLER__) */ /* offsets into the thread_info struct for assembly code access */ #define TI_TASK 0x00000000 #define TI_FLAGS 0x00000008 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE) #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE) #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP) #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH) #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED) #define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR) #define TI_FPSAVED 0x00000010 #define TI_KSP 0x00000018 #define TI_FAULT_ADDR 0x00000020 #define TI_KREGS 0x00000028 #define TI_PRE_COUNT 0x00000030 #define TI_NEW_CHILD 0x00000034 #define TI_CPU 0x00000036 #define TI_UTRAPS 0x00000038 #define TI_REG_WINDOW 0x00000040 #define TI_RWIN_SPTRS 0x000003c0 #define TI_GSR 0x000003f8 #define TI_XFSR 0x00000430 #define TI_KUNA_REGS 0x00000468 #define TI_KUNA_INSN 0x00000470 #define TI_FPREGS 0x00000480 /* We embed this in the uppermost byte of thread_info->flags */ #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */ #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */ #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */ #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */ #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */ #define FAULT_CODE_BAD_RA 0x20 /* Bad RA for sun4v */ #if PAGE_SHIFT == 13 #define THREAD_SIZE (2*PAGE_SIZE) #define THREAD_SHIFT (PAGE_SHIFT + 1) #else /* PAGE_SHIFT == 13 */ #define THREAD_SIZE PAGE_SIZE #define THREAD_SHIFT PAGE_SHIFT #endif /* PAGE_SHIFT == 13 */ /* * macros/functions for gaining access to the thread information structure */ #ifndef __ASSEMBLER__ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .preempt_count = INIT_PREEMPT_COUNT, \ .kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \ } /* how to get the thread information struct from C */ #ifndef BUILD_VDSO register struct thread_info *current_thread_info_reg asm("g6"); #define current_thread_info() (current_thread_info_reg) #else extern struct thread_info *current_thread_info(void); #endif /* thread information allocation */ #if PAGE_SHIFT == 13 #define THREAD_SIZE_ORDER 1 #else /* PAGE_SHIFT == 13 */ #define THREAD_SIZE_ORDER 0 #endif /* PAGE_SHIFT == 13 */ #define __thread_flag_byte_ptr(ti) \ ((unsigned char *)(&((ti)->flags))) #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info()) #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE]) #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val)) #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE]) #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val)) #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP]) #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val)) #define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR]) #define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val)) #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH]) #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val)) #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED]) #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val)) #endif /* !(__ASSEMBLER__) */ /* * Thread information flags, only 16 bits are available as we encode * other values into the upper 6 bytes. * * On trap return we need to test several values: * * user: need_resched, notify_resume, sigpending, wsaved * kernel: fpdepth * * So to check for work in the kernel case we simply load the fpdepth * byte out of the flags and test it. For the user case we encode the * lower 3 bytes of flags as follows: * ---------------------------------------- * | wsaved | flags byte 1 | flags byte 2 | * ---------------------------------------- * This optimizes the user test into: * ldx [%g6 + TI_FLAGS], REG1 * sethi %hi(_TIF_USER_WORK_MASK), REG2 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2 * andcc REG1, REG2, %g0 * be,pt no_work_to_do * nop */ #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */ #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */ #define TIF_UPROBE 6 /* breakpointed or singlestepped */ #define TIF_32BIT 7 /* 32-bit binary */ #define TIF_NOHZ 8 /* in adaptive nohz mode */ #define TIF_SECCOMP 9 /* secure computing */ #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */ #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ /* NOTE: Thread flags >= 12 should be ones we have no interest * in using in assembly, else we can't use the mask as * an immediate value in instructions such as andcc. */ #define TIF_MCDPER 12 /* Precise MCD exception */ #define TIF_MEMDIE 13 /* is terminating due to OOM killer */ #define TIF_POLLING_NRFLAG 14 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) #define _TIF_UNALIGNED (1<<TIF_UNALIGNED) #define _TIF_UPROBE (1<<TIF_UPROBE) #define _TIF_32BIT (1<<TIF_32BIT) #define _TIF_NOHZ (1<<TIF_NOHZ) #define _TIF_SECCOMP (1<<TIF_SECCOMP) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \ _TIF_DO_NOTIFY_RESUME_MASK | \ _TIF_NEED_RESCHED) #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \ _TIF_SIGPENDING | _TIF_UPROBE | \ _TIF_NOTIFY_SIGNAL) #define is_32bit_task() (test_thread_flag(TIF_32BIT)) /* * Thread-synchronous status. * * This is different from the flags in that nobody else * ever touches our thread-synchronous status, so we don't * have to worry about atomic accesses. * * Note that there are only 8 bits available. */ #ifndef __ASSEMBLER__ #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0) #define test_thread_64bit_stack(__SP) \ ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \ false : true) #endif /* !__ASSEMBLER__ */ #endif /* __KERNEL__ */ #endif /* _ASM_THREAD_INFO_H */
