ac5c8b7c5b
1. Name the kernel option XTRACE instead of EXCEPTION_TRACING
2. Put support functions in ia64/ia64/xtrace.c
3. Make it work with SMP by giving each CPU its own buffer
4. Save 16 key registers in the buffer for every exception
5. In ia64_handle_intr() and trap() transfer the trace record
to the KTR trace buffer using CTRx() and with some basic
information for now
6. Use a tunable to anble tracing and stop tracing as soon as
we enter the debugger
Room for improvements:
1. Transferring exception-relevant information to KTR
2. Add a sysctl to enable/disable tracing
102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/*-
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* Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
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* Copyright (c) Peter Wemm <peter@netplex.com.au>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PCPU_H_
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#define _MACHINE_PCPU_H_
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#include <sys/sysctl.h>
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#include <machine/pcb.h>
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struct pcpu_stats {
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u_long pcs_nasts; /* IPI_AST counter. */
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u_long pcs_nclks; /* Clock interrupt counter. */
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u_long pcs_nextints; /* ExtINT counter. */
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u_long pcs_nhardclocks; /* IPI_HARDCLOCK counter. */
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u_long pcs_nhighfps; /* IPI_HIGH_FP counter. */
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u_long pcs_nhwints; /* Hardware int. counter. */
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u_long pcs_npreempts; /* IPI_PREEMPT counter. */
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u_long pcs_nrdvs; /* IPI_RENDEZVOUS counter. */
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u_long pcs_nstops; /* IPI_STOP counter. */
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u_long pcs_nstrays; /* Stray interrupt counter. */
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};
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struct pcpu_md {
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struct pcb pcb; /* Used by IPI_STOP */
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struct pmap *current_pmap; /* active pmap */
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vm_offset_t vhpt; /* Address of VHPT */
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uint64_t lid; /* local CPU ID */
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uint64_t clock; /* Clock counter. */
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uint64_t clock_load; /* Clock reload value. */
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uint32_t clock_mode; /* Clock ET mode */
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uint32_t awake:1; /* CPU is awake? */
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struct pcpu_stats stats; /* Interrupt stats. */
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void *xtrace_buffer;
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uint64_t xtrace_tail;
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#ifdef _KERNEL
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struct sysctl_ctx_list sysctl_ctx;
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struct sysctl_oid *sysctl_tree;
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#endif
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};
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#define PCPU_MD_FIELDS \
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uint32_t pc_acpi_id; /* ACPI CPU id. */ \
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struct pcpu_md pc_md; /* MD fields. */ \
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char __pad[10*128]
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#ifdef _KERNEL
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struct pcpu;
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register struct pcpu * volatile pcpup __asm__("r13");
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static __inline __pure2 struct thread *
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__curthread(void)
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{
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struct thread *td;
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__asm("ld8.acq %0=[r13]" : "=r"(td));
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return (td);
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}
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#define curthread (__curthread())
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#define PCPU_GET(member) (pcpup->pc_ ## member)
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/*
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* XXX The implementation of this operation should be made atomic
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* with respect to preemption.
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*/
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#define PCPU_ADD(member, value) (pcpup->pc_ ## member += (value))
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#define PCPU_INC(member) PCPU_ADD(member, 1)
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#define PCPU_PTR(member) (&pcpup->pc_ ## member)
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#define PCPU_SET(member,value) (pcpup->pc_ ## member = (value))
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#endif /* _KERNEL */
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#endif /* !_MACHINE_PCPU_H_ */
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