/* Native-dependent code for NetBSD/i386. Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "gdbcore.h" #include "regcache.h" #include "target.h" #include "i386-tdep.h" #include "i386bsd-nat.h" /* Support for debugging kernel virtual memory images. */ #include <sys/types.h> #include <machine/frame.h> #include <machine/pcb.h> #include "nbsd-nat.h" #include "bsd-kvm.h" static int i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) { struct switchframe sf; /* The following is true for NetBSD 1.6.2: The pcb contains %esp and %ebp at the point of the context switch in cpu_switch(). At that point we have a stack frame as described by `struct switchframe', which for NetBSD 1.6.2 has the following layout: interrupt level %edi %esi %ebx %eip we reconstruct the register state as it would look when we just returned from cpu_switch(). */ /* The stack pointer shouldn't be zero. */ if (pcb->pcb_esp == 0) return 0; read_memory (pcb->pcb_esp, (gdb_byte *)&sf, sizeof sf); pcb->pcb_esp += sizeof (struct switchframe); regcache_raw_supply (regcache, I386_EDI_REGNUM, &sf.sf_edi); regcache_raw_supply (regcache, I386_ESI_REGNUM, &sf.sf_esi); regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp); regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp); regcache_raw_supply (regcache, I386_EBX_REGNUM, &sf.sf_ebx); regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip); return 1; } /* Provide a prototype to silence -Wmissing-prototypes. */ void _initialize_i386nbsd_nat (void); void _initialize_i386nbsd_nat (void) { struct target_ops *t; /* Add some extra features to the common *BSD/i386 target. */ t = i386bsd_target (); t->to_pid_to_exec_file = nbsd_pid_to_exec_file; add_target (t); /* Support debugging kernel virtual memory images. */ bsd_kvm_add_target (i386nbsd_supply_pcb); }