132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/* Kernel core dump functions below target vector, for GDB on FreeBSD/i386.
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Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995
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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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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__FBSDID("$FreeBSD$");
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#include <machine/frame.h>
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static CORE_ADDR
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ksym_maxuseraddr (void)
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{
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static CORE_ADDR maxuseraddr;
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struct minimal_symbol *sym;
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if (maxuseraddr == 0)
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{
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sym = lookup_minimal_symbol ("PTmap", NULL, NULL);
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if (sym == NULL) {
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maxuseraddr = VM_MAXUSER_ADDRESS;
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} else {
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maxuseraddr = SYMBOL_VALUE_ADDRESS (sym);
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}
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}
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return maxuseraddr;
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}
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/* Symbol names of kernel entry points. Use special frames. */
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#define KSYM_TRAP "calltrap"
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#define KSYM_INTR "Xintr"
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#define KSYM_FASTINTR "Xfastintr"
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#define KSYM_OLDSYSCALL "Xlcall_syscall"
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#define KSYM_SYSCALL "Xint0x80_syscall"
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/* The following is FreeBSD-specific hackery to decode special frames
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and elide the assembly-language stub. This could be made faster by
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defining a frame_type field in the machine-dependent frame information,
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but we don't think that's too important right now. */
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enum frametype { tf_normal, tf_trap, tf_interrupt, tf_syscall };
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CORE_ADDR
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fbsd_kern_frame_saved_pc (struct frame_info *fi)
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{
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struct minimal_symbol *sym;
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CORE_ADDR this_saved_pc;
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enum frametype frametype;
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this_saved_pc = read_memory_integer (fi->frame + 4, 4);
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sym = lookup_minimal_symbol_by_pc (this_saved_pc);
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frametype = tf_normal;
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if (sym != NULL)
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{
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if (strcmp (SYMBOL_NAME (sym), KSYM_TRAP) == 0)
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frametype = tf_trap;
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else
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if (strncmp (SYMBOL_NAME (sym), KSYM_INTR,
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strlen (KSYM_INTR)) == 0 || strncmp (SYMBOL_NAME(sym),
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KSYM_FASTINTR, strlen (KSYM_FASTINTR)) == 0)
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frametype = tf_interrupt;
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else
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if (strcmp (SYMBOL_NAME (sym), KSYM_SYSCALL) == 0 ||
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strcmp (SYMBOL_NAME (sym), KSYM_OLDSYSCALL) == 0)
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frametype = tf_syscall;
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}
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switch (frametype)
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{
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case tf_normal:
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return (this_saved_pc);
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#define oEIP offsetof (struct trapframe, tf_eip)
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case tf_trap:
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return (read_memory_integer (fi->frame + 8 + oEIP, 4));
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case tf_interrupt:
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return (read_memory_integer (fi->frame + 12 + oEIP, 4));
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case tf_syscall:
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return (read_memory_integer (fi->frame + 8 + oEIP, 4));
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#undef oEIP
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}
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}
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static void
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fetch_kcore_registers (struct pcb *pcb)
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{
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int i;
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int noreg;
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/* Get the register values out of the sys pcb and store them where
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`read_register' will find them. */
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/*
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* XXX many registers aren't available.
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* XXX for the non-core case, the registers are stale - they are for
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* the last context switch to the debugger.
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* XXX gcc's register numbers aren't all #defined in tm-i386.h.
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*/
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noreg = 0;
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for (i = 0; i < 3; ++i) /* eax,ecx,edx */
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supply_register (i, (char *)&noreg);
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supply_register (3, (char *) &pcb->pcb_ebx);
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supply_register (SP_REGNUM, (char *) &pcb->pcb_esp);
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supply_register (FP_REGNUM, (char *) &pcb->pcb_ebp);
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supply_register (6, (char *) &pcb->pcb_esi);
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supply_register (7, (char *) &pcb->pcb_edi);
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supply_register (PC_REGNUM, (char *) &pcb->pcb_eip);
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for (i = 9; i < 14; ++i) /* eflags, cs, ss, ds, es, fs */
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supply_register (i, (char *) &noreg);
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supply_register (15, (char *) &pcb->pcb_gs);
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/* XXX 80387 registers? */
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}
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