645743ea99
certain kernel structures for use by debuggers. This mostly aids in examining cores from a kernel without debug symbols as a debugger can infer these values if debug symbols are available. One set of variables describes the layout of 'struct linker_file' to walk the list of loaded kernel modules. A second set of variables describes the layout of 'struct proc' and 'struct thread' to walk the list of processes in the kernel and the threads in each process. The 'pcb_size' variable is used to index into the stoppcbs[] array. The 'vm_maxuser_address' is used to distinguish kernel virtual addresses from user addresses. This doesn't have to be perfect, and 'vm_maxuser_address' is a cheap and simple way to differentiate kernel pointers from simple values like TIDs and PIDs. While here, annotate the fields in struct pcb used by kgdb on amd64 and i386 to note that their ABI should be preserved. Annotations for other platforms will be added in the future. Reviewed by: kib MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D3773
116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from: @(#)pcb.h 5.10 (Berkeley) 5/12/91
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* $FreeBSD$
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*/
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#ifndef _I386_PCB_H_
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#define _I386_PCB_H_
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/*
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* Intel 386 process control block
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*/
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#ifndef _KERNEL
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#include <machine/segments.h>
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#endif
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#include <machine/npx.h>
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/*
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* NB: The fields marked with (*) are used by kernel debuggers. Their
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* ABI should be preserved.
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*/
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struct pcb {
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int pcb_edi; /* (*) */
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int pcb_esi; /* (*) */
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int pcb_ebp; /* (*) */
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int pcb_esp; /* (*) */
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int pcb_ebx; /* (*) */
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int pcb_eip; /* (*) */
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struct segment_descriptor pcb_fsd;
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struct segment_descriptor pcb_gsd;
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int pcb_ds;
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int pcb_es;
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int pcb_fs;
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int pcb_gs;
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int pcb_ss;
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int pcb_cr0;
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int pcb_cr2;
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int pcb_cr3;
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int pcb_cr4;
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int pcb_dr0;
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int pcb_dr1;
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int pcb_dr2;
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int pcb_dr3;
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int pcb_dr6;
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int pcb_dr7;
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struct region_descriptor pcb_gdt;
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struct region_descriptor pcb_idt;
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uint16_t pcb_ldt;
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uint16_t pcb_tr;
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u_int pcb_flags;
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#define PCB_DBREGS 0x02 /* process using debug registers */
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#define PCB_NPXINITDONE 0x08 /* fpu state is initialized */
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#define PCB_VM86CALL 0x10 /* in vm86 call */
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#define PCB_NPXUSERINITDONE 0x20 /* user fpu state is initialized */
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#define PCB_KERNNPX 0x40 /* kernel uses npx */
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uint16_t pcb_initial_npxcw;
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caddr_t pcb_onfault; /* copyin/out fault recovery */
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struct pcb_ext *pcb_ext; /* optional pcb extension */
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int pcb_psl; /* process status long */
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u_long pcb_vm86[2]; /* vm86bios scratch space */
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union savefpu *pcb_save;
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uint32_t pcb_pad[10];
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};
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/* Per-CPU state saved during suspend and resume. */
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struct susppcb {
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struct pcb sp_pcb;
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/* fpu context for suspend/resume */
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void *sp_fpususpend;
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};
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#ifdef _KERNEL
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struct trapframe;
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void makectx(struct trapframe *, struct pcb *);
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int savectx(struct pcb *) __returns_twice;
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void resumectx(struct pcb *) __fastcall;
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#endif
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#endif /* _I386_PCB_H_ */
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