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freebsd-dev/sys/x86/include/x86_var.h
John Baldwin 9e2154ff1c Cleanups related to debug exceptions on x86. 
- Add constants for fields in DR6 and the reserved fields in DR7.  Use
  these constants instead of magic numbers in most places that use DR6
  and DR7.
- Refer to T_TRCTRAP as "debug exception" rather than a "trace trap"
  as it is not just for trace exceptions.
- Always read DR6 for debug exceptions and only clear TF in the flags
  register for user exceptions where DR6.BS is set.
- Clear DR6 before returning from a debug exception handler as
  recommended by the SDM dating all the way back to the 386.  This
  allows debuggers to determine the cause of each exception.  For
  kernel traps, clear DR6 in the T_TRCTRAP case and pass DR6 by value
  to other parts of the handler (namely, user_dbreg_trap()).  For user
  traps, wait until after trapsignal to clear DR6 so that userland
  debuggers can read DR6 via PT_GETDBREGS while the thread is stopped
  in trapsignal().

Reviewed by:	kib, rgrimes
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D15189
2018-05-22 00:45:00 +00:00

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/*-
* Copyright (c) 1995 Bruce D. Evans.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _X86_X86_VAR_H_
#define _X86_X86_VAR_H_
/*
* Miscellaneous machine-dependent declarations.
*/
extern long Maxmem;
extern u_int basemem;
extern int busdma_swi_pending;
extern u_int cpu_exthigh;
extern u_int cpu_feature;
extern u_int cpu_feature2;
extern u_int amd_feature;
extern u_int amd_feature2;
extern u_int amd_rascap;
extern u_int amd_pminfo;
extern u_int amd_extended_feature_extensions;
extern u_int via_feature_rng;
extern u_int via_feature_xcrypt;
extern u_int cpu_clflush_line_size;
extern u_int cpu_stdext_feature;
extern u_int cpu_stdext_feature2;
extern u_int cpu_stdext_feature3;
extern uint64_t cpu_ia32_arch_caps;
extern u_int cpu_fxsr;
extern u_int cpu_high;
extern u_int cpu_id;
extern u_int cpu_max_ext_state_size;
extern u_int cpu_mxcsr_mask;
extern u_int cpu_procinfo;
extern u_int cpu_procinfo2;
extern char cpu_vendor[];
extern u_int cpu_vendor_id;
extern u_int cpu_mon_mwait_flags;
extern u_int cpu_mon_min_size;
extern u_int cpu_mon_max_size;
extern u_int cpu_maxphyaddr;
extern char ctx_switch_xsave[];
extern u_int hv_high;
extern char hv_vendor[];
extern char kstack[];
extern char sigcode[];
extern int szsigcode;
extern int vm_page_dump_size;
extern int workaround_erratum383;
extern int _udatasel;
extern int _ucodesel;
extern int _ucode32sel;
extern int _ufssel;
extern int _ugssel;
extern int use_xsave;
extern uint64_t xsave_mask;
extern u_int max_apic_id;
extern int pti;
extern int hw_ibrs_active;
extern int hw_ssb_active;
struct pcb;
struct thread;
struct reg;
struct fpreg;
struct dbreg;
struct dumperinfo;
struct trapframe;
/*
* The interface type of the interrupt handler entry point cannot be
* expressed in C. Use simplest non-variadic function type as an
* approximation.
*/
typedef void alias_for_inthand_t(void);
/*
* Returns the maximum physical address that can be used with the
* current system.
*/
static __inline vm_paddr_t
cpu_getmaxphyaddr(void)
{
#if defined(__i386__) && !defined(PAE)
return (0xffffffff);
#else
return ((1ULL << cpu_maxphyaddr) - 1);
#endif
}
void *alloc_fpusave(int flags);
void busdma_swi(void);
bool cpu_mwait_usable(void);
void cpu_probe_amdc1e(void);
void cpu_setregs(void);
bool disable_wp(void);
void restore_wp(bool old_wp);
void dump_add_page(vm_paddr_t);
void dump_drop_page(vm_paddr_t);
void finishidentcpu(void);
void identify_cpu1(void);
void identify_cpu2(void);
void identify_hypervisor(void);
void initializecpu(void);
void initializecpucache(void);
bool fix_cpuid(void);
void fillw(int /*u_short*/ pat, void *base, size_t cnt);
int is_physical_memory(vm_paddr_t addr);
int isa_nmi(int cd);
void handle_ibrs_entry(void);
void handle_ibrs_exit(void);
void hw_ibrs_recalculate(void);
void hw_ssb_recalculate(bool all_cpus);
void nmi_call_kdb(u_int cpu, u_int type, struct trapframe *frame);
void nmi_call_kdb_smp(u_int type, struct trapframe *frame);
void nmi_handle_intr(u_int type, struct trapframe *frame);
void pagecopy(void *from, void *to);
void printcpuinfo(void);
int pti_get_default(void);
int user_dbreg_trap(register_t dr6);
int minidumpsys(struct dumperinfo *);
struct pcb *get_pcb_td(struct thread *td);
#endif
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