1/* Native-dependent code for NetBSD/i386. 2 3 Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20#include "defs.h" 21#include "gdbcore.h" 22#include "regcache.h" 23#include "target.h" 24 25#include "i386-tdep.h" 26#include "i386bsd-nat.h" 27 28/* Support for debugging kernel virtual memory images. */ 29 30#include <sys/types.h> 31#include <machine/frame.h> 32#include <machine/pcb.h> 33 34#include "nbsd-nat.h" 35#include "bsd-kvm.h" 36 37static int 38i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) 39{ 40 struct switchframe sf; 41 42 /* The following is true for NetBSD 1.6.2: 43 44 The pcb contains %esp and %ebp at the point of the context switch 45 in cpu_switch(). At that point we have a stack frame as 46 described by `struct switchframe', which for NetBSD 1.6.2 has the 47 following layout: 48 49 interrupt level 50 %edi 51 %esi 52 %ebx 53 %eip 54 55 we reconstruct the register state as it would look when we just 56 returned from cpu_switch(). */ 57 58 /* The stack pointer shouldn't be zero. */ 59 if (pcb->pcb_esp == 0) 60 return 0; 61 62 read_memory (pcb->pcb_esp, (gdb_byte *)&sf, sizeof sf); 63 pcb->pcb_esp += sizeof (struct switchframe); 64 regcache_raw_supply (regcache, I386_EDI_REGNUM, &sf.sf_edi); 65 regcache_raw_supply (regcache, I386_ESI_REGNUM, &sf.sf_esi); 66 regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp); 67 regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp); 68 regcache_raw_supply (regcache, I386_EBX_REGNUM, &sf.sf_ebx); 69 regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip); 70 71 return 1; 72} 73 74 75/* Provide a prototype to silence -Wmissing-prototypes. */ 76void _initialize_i386nbsd_nat (void); 77 78void 79_initialize_i386nbsd_nat (void) 80{ 81 struct target_ops *t; 82 83 /* Add some extra features to the common *BSD/i386 target. */ 84 t = i386bsd_target (); 85 t->to_pid_to_exec_file = nbsd_pid_to_exec_file; 86 add_target (t); 87 88 /* Support debugging kernel virtual memory images. */ 89 bsd_kvm_add_target (i386nbsd_supply_pcb); 90} 91