diff options
Diffstat (limited to 'gdb/i386-netbsd-nat.c')
-rw-r--r-- | gdb/i386-netbsd-nat.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/gdb/i386-netbsd-nat.c b/gdb/i386-netbsd-nat.c new file mode 100644 index 0000000..4faa67f --- /dev/null +++ b/gdb/i386-netbsd-nat.c @@ -0,0 +1,84 @@ +/* Native-dependent code for NetBSD/i386. + + Copyright (C) 2004-2020 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 "i386-bsd-nat.h" + +/* Support for debugging kernel virtual memory images. */ + +#include <sys/types.h> +#include <machine/frame.h> +#include <machine/pcb.h> + +#include "netbsd-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 (I386_EDI_REGNUM, &sf.sf_edi); + regcache->raw_supply (I386_ESI_REGNUM, &sf.sf_esi); + regcache->raw_supply (I386_EBP_REGNUM, &pcb->pcb_ebp); + regcache->raw_supply (I386_ESP_REGNUM, &pcb->pcb_esp); + regcache->raw_supply (I386_EBX_REGNUM, &sf.sf_ebx); + regcache->raw_supply (I386_EIP_REGNUM, &sf.sf_eip); + + return 1; +} + +static i386_bsd_nat_target<nbsd_nat_target> the_i386_nbsd_nat_target; + +void _initialize_i386nbsd_nat (); +void +_initialize_i386nbsd_nat () +{ + add_inf_child_target (&the_i386_nbsd_nat_target); + + /* Support debugging kernel virtual memory images. */ + bsd_kvm_add_target (i386nbsd_supply_pcb); +} |