5f66d5a313
The program counter field in the PCB is written in exactly one place, makectx(), upon entry to the debugger. For threads other than curthread, its value will be empty, or bogus. Rather than writing to this field in more places, it can be removed in favor of using the value in the link register. To make this clearer, pcb->pcb_x[30] is renamed to pcb->pcb_lr, similar to what already exists in struct trapframe. Also, prefer lr to x30 in assembly, as it better conveys intention. This improves PC_REGS() for kdb_thread != curthread. It is required for a functional gdb(4) stub, fixing the output of `info threads`, in particular. The space occupied by pcb_pc is retained, for compatibility with kgdb. Reviewed by: markj, jhb MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D27720
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/*-
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* Copyright (c) 2001 Jake Burkholder.
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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_PCB_H_
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#define _MACHINE_PCB_H_
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#ifndef LOCORE
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#include <machine/debug_monitor.h>
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#include <machine/vfp.h>
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struct trapframe;
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struct pcb {
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uint64_t pcb_x[30];
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uint64_t pcb_lr;
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uint64_t _reserved; /* Was pcb_pc */
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/* These two need to be in order as we access them together */
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uint64_t pcb_sp;
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uint64_t pcb_tpidr_el0;
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uint64_t pcb_tpidrro_el0;
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/* Fault handler, the error value is passed in x0 */
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vm_offset_t pcb_onfault;
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u_int pcb_flags;
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#define PCB_SINGLE_STEP_SHIFT 0
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#define PCB_SINGLE_STEP (1 << PCB_SINGLE_STEP_SHIFT)
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struct vfpstate *pcb_fpusaved;
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int pcb_fpflags;
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#define PCB_FP_STARTED 0x01
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#define PCB_FP_KERN 0x02
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#define PCB_FP_NOSAVE 0x04
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/* The bits passed to userspace in get_fpcontext */
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#define PCB_FP_USERMASK (PCB_FP_STARTED)
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u_int pcb_vfpcpu; /* Last cpu this thread ran VFP code */
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/*
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* The userspace VFP state. The pcb_fpusaved pointer will point to
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* this unless the kernel has allocated a VFP context.
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* Place last to simplify the asm to access the rest if the struct.
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*/
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struct vfpstate pcb_fpustate;
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struct debug_monitor_state pcb_dbg_regs;
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};
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#ifdef _KERNEL
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void makectx(struct trapframe *tf, struct pcb *pcb);
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int savectx(struct pcb *pcb) __returns_twice;
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#endif
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#endif /* !LOCORE */
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#endif /* !_MACHINE_PCB_H_ */
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