1/* Native-dependent code for NetBSD/i386. 2 3 Copyright 2004 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 2 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, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22#include "defs.h" 23#include "gdbcore.h" 24#include "regcache.h" 25#include "target.h" 26 27#include "i386-tdep.h" 28#include "i386bsd-nat.h" 29 30/* Support for debugging kernel virtual memory images. */ 31 32#include <sys/types.h> 33#include <machine/frame.h> 34#include <machine/pcb.h> 35 36#include "bsd-kvm.h" 37 38static int 39i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) 40{ 41 struct switchframe sf; 42 43 /* The following is true for NetBSD 1.6.2: 44 45 The pcb contains %esp and %ebp at the point of the context switch 46 in cpu_switch(). At that point we have a stack frame as 47 described by `struct switchframe', which for NetBSD 1.6.2 has the 48 following layout: 49 50 interrupt level 51 %edi 52 %esi 53 %ebx 54 %eip 55 56 we reconstruct the register state as it would look when we just 57 returned from cpu_switch(). */ 58 59 /* The stack pointer shouldn't be zero. */ 60 if (pcb->pcb_esp == 0) 61 return 0; 62 63 read_memory (pcb->pcb_esp, (char *) &sf, sizeof sf); 64 pcb->pcb_esp += sizeof (struct switchframe); 65 regcache_raw_supply (regcache, I386_EDI_REGNUM, &sf.sf_edi); 66 regcache_raw_supply (regcache, I386_ESI_REGNUM, &sf.sf_esi); 67 regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp); 68 regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp); 69 regcache_raw_supply (regcache, I386_EBX_REGNUM, &sf.sf_ebx); 70 regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip); 71 72 return 1; 73} 74 75 76/* Provide a prototype to silence -Wmissing-prototypes. */ 77void _initialize_i386nbsd_nat (void); 78 79void 80_initialize_i386nbsd_nat (void) 81{ 82 /* We've got nothing to add to the common *BSD/i386 target. */ 83 add_target (i386bsd_target ()); 84 85 /* Support debugging kernel virtual memory images. */ 86 bsd_kvm_add_target (i386nbsd_supply_pcb); 87} 88