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91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/* Native-dependent code for NetBSD/i386.
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Copyright (C) 2004-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "target.h"
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#include "i386-tdep.h"
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#include "i386-bsd-nat.h"
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/* Support for debugging kernel virtual memory images. */
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#include <sys/types.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include "nbsd-nat.h"
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#include "bsd-kvm.h"
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static int
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i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
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{
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struct switchframe sf;
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/* The following is true for NetBSD 1.6.2:
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The pcb contains %esp and %ebp at the point of the context switch
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in cpu_switch(). At that point we have a stack frame as
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described by `struct switchframe', which for NetBSD 1.6.2 has the
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following layout:
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interrupt level
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%edi
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%esi
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%ebx
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%eip
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we reconstruct the register state as it would look when we just
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returned from cpu_switch(). */
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/* The stack pointer shouldn't be zero. */
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if (pcb->pcb_esp == 0)
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return 0;
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read_memory (pcb->pcb_esp, (gdb_byte *)&sf, sizeof sf);
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pcb->pcb_esp += sizeof (struct switchframe);
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regcache_raw_supply (regcache, I386_EDI_REGNUM, &sf.sf_edi);
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regcache_raw_supply (regcache, I386_ESI_REGNUM, &sf.sf_esi);
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regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp);
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regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp);
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regcache_raw_supply (regcache, I386_EBX_REGNUM, &sf.sf_ebx);
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regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip);
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return 1;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_i386nbsd_nat (void);
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void
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_initialize_i386nbsd_nat (void)
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{
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struct target_ops *t;
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/* Add some extra features to the common *BSD/i386 target. */
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t = i386bsd_target ();
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t->to_pid_to_exec_file = nbsd_pid_to_exec_file;
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add_target (t);
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/* Support debugging kernel virtual memory images. */
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bsd_kvm_add_target (i386nbsd_supply_pcb);
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}
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