238 lines
7.8 KiB
C
238 lines
7.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* thread_info.h: sparc64 low-level thread information
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*
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* Copyright (C) 2002 David S. Miller (davem@redhat.com)
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_THREAD_INFO_H
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#ifdef __KERNEL__
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#define NSWINS 7
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#define TI_FLAG_BYTE_FAULT_CODE 0
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#define TI_FLAG_FAULT_CODE_SHIFT 56
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#define TI_FLAG_BYTE_WSTATE 1
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#define TI_FLAG_WSTATE_SHIFT 48
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#define TI_FLAG_BYTE_NOERROR 2
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#define TI_FLAG_BYTE_NOERROR_SHIFT 40
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#define TI_FLAG_BYTE_FPDEPTH 3
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#define TI_FLAG_FPDEPTH_SHIFT 32
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#define TI_FLAG_BYTE_CWP 4
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#define TI_FLAG_CWP_SHIFT 24
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#define TI_FLAG_BYTE_WSAVED 5
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#define TI_FLAG_WSAVED_SHIFT 16
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#include <asm/page.h>
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#ifndef __ASSEMBLY__
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#include <asm/ptrace.h>
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#include <asm/types.h>
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struct task_struct;
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struct thread_info {
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/* D$ line 1 */
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struct task_struct *task;
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unsigned long flags;
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__u8 fpsaved[7];
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__u8 status;
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unsigned long ksp;
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/* D$ line 2 */
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unsigned long fault_address;
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struct pt_regs *kregs;
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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__u8 new_child;
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__u8 current_ds;
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__u16 cpu;
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unsigned long *utraps;
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struct reg_window reg_window[NSWINS];
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unsigned long rwbuf_stkptrs[NSWINS];
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unsigned long gsr[7];
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unsigned long xfsr[7];
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struct pt_regs *kern_una_regs;
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unsigned int kern_una_insn;
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unsigned long fpregs[(7 * 256) / sizeof(unsigned long)]
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__attribute__ ((aligned(64)));
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};
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#endif /* !(__ASSEMBLY__) */
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/* offsets into the thread_info struct for assembly code access */
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#define TI_TASK 0x00000000
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#define TI_FLAGS 0x00000008
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#define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
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#define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
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#define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
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#define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
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#define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
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#define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
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#define TI_FPSAVED 0x00000010
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#define TI_KSP 0x00000018
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#define TI_FAULT_ADDR 0x00000020
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#define TI_KREGS 0x00000028
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#define TI_PRE_COUNT 0x00000030
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#define TI_NEW_CHILD 0x00000034
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#define TI_CURRENT_DS 0x00000035
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#define TI_CPU 0x00000036
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#define TI_UTRAPS 0x00000038
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#define TI_REG_WINDOW 0x00000040
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#define TI_RWIN_SPTRS 0x000003c0
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#define TI_GSR 0x000003f8
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#define TI_XFSR 0x00000430
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#define TI_KUNA_REGS 0x00000468
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#define TI_KUNA_INSN 0x00000470
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#define TI_FPREGS 0x00000480
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/* We embed this in the uppermost byte of thread_info->flags */
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#define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
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#define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
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#define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
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#define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
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#define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
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#define FAULT_CODE_BAD_RA 0x20 /* Bad RA for sun4v */
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#if PAGE_SHIFT == 13
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#define THREAD_SIZE (2*PAGE_SIZE)
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#define THREAD_SHIFT (PAGE_SHIFT + 1)
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#else /* PAGE_SHIFT == 13 */
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#define THREAD_SIZE PAGE_SIZE
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#define THREAD_SHIFT PAGE_SHIFT
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#endif /* PAGE_SHIFT == 13 */
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/*
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* macros/functions for gaining access to the thread information structure
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*/
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#ifndef __ASSEMBLY__
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.current_ds = ASI_P, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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}
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/* how to get the thread information struct from C */
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register struct thread_info *current_thread_info_reg asm("g6");
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#define current_thread_info() (current_thread_info_reg)
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/* thread information allocation */
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#if PAGE_SHIFT == 13
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#define THREAD_SIZE_ORDER 1
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#else /* PAGE_SHIFT == 13 */
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#define THREAD_SIZE_ORDER 0
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#endif /* PAGE_SHIFT == 13 */
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#define __thread_flag_byte_ptr(ti) \
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((unsigned char *)(&((ti)->flags)))
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#define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
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#define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
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#define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
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#define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
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#define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
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#define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
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#define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
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#define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
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#define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
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#define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
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#define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
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#define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
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#define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
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#endif /* !(__ASSEMBLY__) */
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/*
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* Thread information flags, only 16 bits are available as we encode
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* other values into the upper 6 bytes.
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*
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* On trap return we need to test several values:
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*
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* user: need_resched, notify_resume, sigpending, wsaved
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* kernel: fpdepth
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*
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* So to check for work in the kernel case we simply load the fpdepth
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* byte out of the flags and test it. For the user case we encode the
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* lower 3 bytes of flags as follows:
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* ----------------------------------------
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* | wsaved | flags byte 1 | flags byte 2 |
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* ----------------------------------------
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* This optimizes the user test into:
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* ldx [%g6 + TI_FLAGS], REG1
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* sethi %hi(_TIF_USER_WORK_MASK), REG2
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* or REG2, %lo(_TIF_USER_WORK_MASK), REG2
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* andcc REG1, REG2, %g0
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* be,pt no_work_to_do
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* nop
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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/* flag bit 4 is available */
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#define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
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#define TIF_UPROBE 6 /* breakpointed or singlestepped */
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#define TIF_32BIT 7 /* 32-bit binary */
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#define TIF_NOHZ 8 /* in adaptive nohz mode */
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#define TIF_SECCOMP 9 /* secure computing */
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#define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
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#define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
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/* NOTE: Thread flags >= 12 should be ones we have no interest
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* in using in assembly, else we can't use the mask as
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* an immediate value in instructions such as andcc.
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*/
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#define TIF_MCDPER 12 /* Precise MCD exception */
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#define TIF_MEMDIE 13 /* is terminating due to OOM killer */
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#define TIF_POLLING_NRFLAG 14
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
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#define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
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#define _TIF_UPROBE (1<<TIF_UPROBE)
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#define _TIF_32BIT (1<<TIF_32BIT)
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#define _TIF_NOHZ (1<<TIF_NOHZ)
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#define _TIF_SECCOMP (1<<TIF_SECCOMP)
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#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
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_TIF_DO_NOTIFY_RESUME_MASK | \
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_TIF_NEED_RESCHED)
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#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \
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_TIF_SIGPENDING | _TIF_UPROBE)
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#define is_32bit_task() (test_thread_flag(TIF_32BIT))
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/*
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* Thread-synchronous status.
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*
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* This is different from the flags in that nobody else
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* ever touches our thread-synchronous status, so we don't
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* have to worry about atomic accesses.
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*
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* Note that there are only 8 bits available.
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*/
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#ifndef __ASSEMBLY__
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#define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
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#define test_thread_64bit_stack(__SP) \
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((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
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false : true)
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#endif /* !__ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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