--- /dev/null
+/* 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 __ASSEMBLY__
+
+#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 current_ds;
+ __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 /* !(__ASSEMBLY__) */
+
+/* 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_CURRENT_DS 0x00000035
+#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 __ASSEMBLY__
+
+#define INIT_THREAD_INFO(tsk) \
+{ \
+ .task = &tsk, \
+ .current_ds = ASI_P, \
+ .preempt_count = INIT_PREEMPT_COUNT, \
+}
+
+#define init_thread_info (init_thread_union.thread_info)
+#define init_stack (init_thread_union.stack)
+
+/* how to get the thread information struct from C */
+register struct thread_info *current_thread_info_reg asm("g6");
+#define current_thread_info() (current_thread_info_reg)
+
+/* 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 /* !(__ASSEMBLY__) */
+
+/*
+ * 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 */
+/* flag bit 4 is available */
+#define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
+/* flag bit 6 is available */
+#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.
+ */
+/* flag bit 12 is available */
+#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_UNALIGNED (1<<TIF_UNALIGNED)
+#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)
+
+#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.
+ */
+#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
+
+#ifndef __ASSEMBLY__
+#define HAVE_SET_RESTORE_SIGMASK 1
+static inline void set_restore_sigmask(void)
+{
+ struct thread_info *ti = current_thread_info();
+ ti->status |= TS_RESTORE_SIGMASK;
+ WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
+}
+static inline void clear_restore_sigmask(void)
+{
+ current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
+}
+static inline bool test_restore_sigmask(void)
+{
+ return current_thread_info()->status & TS_RESTORE_SIGMASK;
+}
+static inline bool test_and_clear_restore_sigmask(void)
+{
+ struct thread_info *ti = current_thread_info();
+ if (!(ti->status & TS_RESTORE_SIGMASK))
+ return false;
+ ti->status &= ~TS_RESTORE_SIGMASK;
+ return true;
+}
+
+#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 /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_THREAD_INFO_H */
Code Review / kvmfornfv.git / blobdiff