/* Native-dependent code for NetBSD/amd64.
Copyright (C) 2003-2023 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see . */
#include "defs.h"
#include "target.h"
#include "netbsd-nat.h"
#include "amd64-tdep.h"
#include "amd64-bsd-nat.h"
#include "amd64-nat.h"
#include "regcache.h"
#include "gdbcore.h"
#include "bsd-kvm.h"
#include
#include
#include
/* Mapping between the general-purpose registers in NetBSD/amd64
`struct reg' format and GDB's register cache layout for
NetBSD/i386.
Note that most (if not all) NetBSD/amd64 registers are 64-bit,
while the NetBSD/i386 registers are all 32-bit, but since we're
little-endian we get away with that. */
/* From . */
static int amd64nbsd32_r_reg_offset[] =
{
14 * 8, /* %eax */
3 * 8, /* %ecx */
2 * 8, /* %edx */
13 * 8, /* %ebx */
24 * 8, /* %esp */
12 * 8, /* %ebp */
1 * 8, /* %esi */
0 * 8, /* %edi */
21 * 8, /* %eip */
23 * 8, /* %eflags */
22 * 8, /* %cs */
25 * 8, /* %ss */
18 * 8, /* %ds */
17 * 8, /* %es */
16 * 8, /* %fs */
15 * 8 /* %gs */
};
static int
amd64nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
struct switchframe sf;
/* The following is true for NetBSD/amd64:
The pcb contains the stack pointer at the point of the context
switch in cpu_switchto(). At that point we have a stack frame as
described by `struct switchframe', which for NetBSD/amd64 has the
following layout:
interrupt level
%r15
%r14
%r13
%r12
%rbx
return address
Together with %rsp in the pcb, this accounts for all callee-saved
registers specified by the psABI. From this information we
reconstruct the register state as it would look when we just
returned from cpu_switchto().
For kernel core dumps, dumpsys() builds a fake switchframe for us. */
/* The stack pointer shouldn't be zero. */
if (pcb->pcb_rsp == 0)
return 0;
/* Read the stack frame, and check its validity. */
read_memory (pcb->pcb_rsp, (gdb_byte *) &sf, sizeof sf);
pcb->pcb_rsp += sizeof (struct switchframe);
regcache->raw_supply (12, &sf.sf_r12);
regcache->raw_supply (13, &sf.sf_r13);
regcache->raw_supply (14, &sf.sf_r14);
regcache->raw_supply (15, &sf.sf_r15);
regcache->raw_supply (AMD64_RBX_REGNUM, &sf.sf_rbx);
regcache->raw_supply (AMD64_RIP_REGNUM, &sf.sf_rip);
regcache->raw_supply (AMD64_RSP_REGNUM, &pcb->pcb_rsp);
regcache->raw_supply (AMD64_RBP_REGNUM, &pcb->pcb_rbp);
regcache->raw_supply (AMD64_FS_REGNUM, &pcb->pcb_fs);
regcache->raw_supply (AMD64_GS_REGNUM, &pcb->pcb_gs);
return 1;
}
static amd64_bsd_nat_target the_amd64_nbsd_nat_target;
void _initialize_amd64nbsd_nat ();
void
_initialize_amd64nbsd_nat ()
{
amd64_native_gregset32_reg_offset = amd64nbsd32_r_reg_offset;
amd64_native_gregset32_num_regs = ARRAY_SIZE (amd64nbsd32_r_reg_offset);
amd64_native_gregset64_reg_offset = amd64nbsd_r_reg_offset;
add_inf_child_target (&the_amd64_nbsd_nat_target);
bsd_kvm_add_target (amd64nbsd_supply_pcb);
}