mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2025-01-06 12:09:26 +08:00
1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/* Native-dependent code for OpenBSD/i386.
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Copyright (C) 2002-2024 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "target.h"
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#include <sys/sysctl.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include "i386-tdep.h"
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#include "i386-bsd-nat.h"
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#include "obsd-nat.h"
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#include "bsd-kvm.h"
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static int
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i386obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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struct switchframe sf;
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/* The following is true for OpenBSD 3.6:
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The pcb contains %esp and %ebp at the point of the context switch
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in cpu_switch(). At that point we have a stack frame as
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described by `struct switchframe', which for OpenBSD 3.6 has the
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following layout:
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interrupt level
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%edi
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%esi
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%ebx
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%eip
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we reconstruct the register state as it would look when we just
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returned from cpu_switch(). */
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/* The stack pointer shouldn't be zero. */
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if (pcb->pcb_esp == 0)
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return 0;
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/* Read the stack frame, and check its validity. We do this by
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checking if the saved interrupt priority level in the stack frame
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looks reasonable.. */
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#ifdef PCB_SAVECTX
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if ((pcb->pcb_flags & PCB_SAVECTX) == 0)
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{
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/* Yes, we have a frame that matches cpu_switch(). */
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read_memory (pcb->pcb_esp, (gdb_byte *) &sf, sizeof sf);
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pcb->pcb_esp += sizeof (struct switchframe);
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regcache->raw_supply (I386_EDI_REGNUM, &sf.sf_edi);
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regcache->raw_supply (I386_ESI_REGNUM, &sf.sf_esi);
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regcache->raw_supply (I386_EBX_REGNUM, &sf.sf_ebx);
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regcache->raw_supply (I386_EIP_REGNUM, &sf.sf_eip);
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}
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else
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#endif
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{
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/* No, the pcb must have been last updated by savectx(). */
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pcb->pcb_esp = pcb->pcb_ebp;
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pcb->pcb_ebp = read_memory_integer(pcb->pcb_esp, 4, byte_order);
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sf.sf_eip = read_memory_integer(pcb->pcb_esp + 4, 4, byte_order);
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regcache->raw_supply (I386_EIP_REGNUM, &sf.sf_eip);
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}
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regcache->raw_supply (I386_EBP_REGNUM, &pcb->pcb_ebp);
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regcache->raw_supply (I386_ESP_REGNUM, &pcb->pcb_esp);
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return 1;
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}
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static i386_bsd_nat_target<obsd_nat_target> the_i386_obsd_nat_target;
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void _initialize_i386obsd_nat ();
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void
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_initialize_i386obsd_nat ()
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{
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add_inf_child_target (&i386_obsd_nat_target);
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/* Support debugging kernel virtual memory images. */
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bsd_kvm_add_target (i386obsd_supply_pcb);
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/* OpenBSD provides a vm.psstrings sysctl that we can use to locate
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the sigtramp. That way we can still recognize a sigtramp if its
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location is changed in a new kernel. This is especially
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important for OpenBSD, since it uses a different memory layout
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than NetBSD, yet we cannot distinguish between the two.
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Of course this is still based on the assumption that the sigtramp
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is placed directly under the location where the program arguments
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and environment can be found. */
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#ifdef VM_PSSTRINGS
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{
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struct _ps_strings _ps;
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int mib[2];
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size_t len;
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mib[0] = CTL_VM;
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mib[1] = VM_PSSTRINGS;
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len = sizeof (_ps);
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if (sysctl (mib, 2, &_ps, &len, NULL, 0) == 0)
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{
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i386obsd_sigtramp_start_addr = (u_long) _ps.val - 128;
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i386obsd_sigtramp_end_addr = (u_long) _ps.val;
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}
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}
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#endif
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}
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