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.
144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/* Native-dependent code for OpenBSD/amd64.
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Copyright (C) 2003-2024 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 "amd64-tdep.h"
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#include "amd64-bsd-nat.h"
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#include "amd64-nat.h"
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#include "obsd-nat.h"
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/* Mapping between the general-purpose registers in OpenBSD/amd64
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`struct reg' format and GDB's register cache layout for
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OpenBSD/i386.
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Note that most (if not all) OpenBSD/amd64 registers are 64-bit,
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while the OpenBSD/i386 registers are all 32-bit, but since we're
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little-endian we get away with that. */
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/* From <machine/reg.h>. */
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static int amd64obsd32_r_reg_offset[] =
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{
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14 * 8, /* %eax */
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3 * 8, /* %ecx */
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2 * 8, /* %edx */
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13 * 8, /* %ebx */
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15 * 8, /* %esp */
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12 * 8, /* %ebp */
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1 * 8, /* %esi */
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0 * 8, /* %edi */
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16 * 8, /* %eip */
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17 * 8, /* %eflags */
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18 * 8, /* %cs */
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19 * 8, /* %ss */
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20 * 8, /* %ds */
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21 * 8, /* %es */
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22 * 8, /* %fs */
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23 * 8 /* %gs */
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};
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/* Support for debugging kernel virtual memory images. */
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#include <sys/types.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include "bsd-kvm.h"
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static int
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amd64obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
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{
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struct switchframe sf;
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int regnum;
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/* The following is true for OpenBSD 3.5:
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The pcb contains the stack pointer at the point of the context
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switch in cpu_switch(). At that point we have a stack frame as
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described by `struct switchframe', which for OpenBSD 3.5 has the
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following layout:
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interrupt level
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%r15
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%r14
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%r13
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%r12
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%rbp
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%rbx
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return address
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Together with %rsp in the pcb, this accounts for all callee-saved
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registers specified by the psABI. From this information we
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reconstruct the register state as it would look when we just
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returned from cpu_switch().
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For core dumps the pcb is saved by savectx(). In that case the
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stack frame only contains the return address, and there is no way
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to recover the other registers. */
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/* The stack pointer shouldn't be zero. */
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if (pcb->pcb_rsp == 0)
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return 0;
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/* Read the stack frame, and check its validity. */
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read_memory (pcb->pcb_rsp, (gdb_byte *) &sf, sizeof sf);
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if (sf.sf_rbp == pcb->pcb_rbp)
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{
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/* Yes, we have a frame that matches cpu_switch(). */
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pcb->pcb_rsp += sizeof (struct switchframe);
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regcache->raw_supply (12, &sf.sf_r12);
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regcache->raw_supply (13, &sf.sf_r13);
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regcache->raw_supply (14, &sf.sf_r14);
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regcache->raw_supply (15, &sf.sf_r15);
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regcache->raw_supply (AMD64_RBX_REGNUM, &sf.sf_rbx);
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regcache->raw_supply (AMD64_RIP_REGNUM, &sf.sf_rip);
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}
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else
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{
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/* No, the pcb must have been last updated by savectx(). */
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pcb->pcb_rsp += 8;
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regcache->raw_supply (AMD64_RIP_REGNUM, &sf);
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}
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regcache->raw_supply (AMD64_RSP_REGNUM, &pcb->pcb_rsp);
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regcache->raw_supply (AMD64_RBP_REGNUM, &pcb->pcb_rbp);
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return 1;
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}
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static amd64_bsd_nat_target<obsd_nat_target> the_amd64_obsd_nat_target;
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void _initialize_amd64obsd_nat ();
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void
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_initialize_amd64obsd_nat ()
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{
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amd64_native_gregset32_reg_offset = amd64obsd32_r_reg_offset;
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amd64_native_gregset32_num_regs = ARRAY_SIZE (amd64obsd32_r_reg_offset);
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amd64_native_gregset64_reg_offset = amd64obsd_r_reg_offset;
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add_inf_child_target (&the_amd64_obsd_nat_target);
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/* Support debugging kernel virtual memory images. */
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bsd_kvm_add_target (amd64obsd_supply_pcb);
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}
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