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/* Native-dependent code for BSD Unix running on ARM's, for GDB.
Copyright (C) 1988-2024 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 <http://www.gnu.org/licenses/>. */
/* We define this to get types like register_t. */
#define _KERNTYPES
#include "defs.h"
#include "gdbcore.h"
#include "inferior.h"
#include "regcache.h"
#include "target.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <machine/reg.h>
#include <machine/frame.h>
#include "arm-tdep.h"
#include "arm-netbsd-tdep.h"
#include "aarch32-tdep.h"
#include "inf-ptrace.h"
#include "netbsd-nat.h"
class arm_netbsd_nat_target final : public nbsd_nat_target
{
public:
/* Add our register access methods. */
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
const struct target_desc *read_description () override;
};
static arm_netbsd_nat_target the_arm_netbsd_nat_target;
static void
arm_supply_vfpregset (struct regcache *regcache, struct fpreg *fpregset)
{
arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (regcache->arch ());
if (tdep->vfp_register_count == 0)
return;
struct vfpreg &vfp = fpregset->fpr_vfp;
for (int regno = 0; regno <= tdep->vfp_register_count; regno++)
regcache->raw_supply (regno + ARM_D0_REGNUM, (char *) &vfp.vfp_regs[regno]);
regcache->raw_supply (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr);
}
static void
fetch_register (struct regcache *regcache, int regno)
{
struct reg inferior_registers;
int ret;
int lwp = regcache->ptid ().lwp ();
ret = ptrace (PT_GETREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &inferior_registers, lwp);
if (ret < 0)
{
warning (_("unable to fetch general register"));
return;
}
arm_nbsd_supply_gregset (nullptr, regcache, regno, &inferior_registers,
sizeof (inferior_registers));
}
static void
fetch_fp_register (struct regcache *regcache, int regno)
{
struct fpreg inferior_fp_registers;
int lwp = regcache->ptid ().lwp ();
int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
struct vfpreg &vfp = inferior_fp_registers.fpr_vfp;
if (ret < 0)
{
warning (_("unable to fetch floating-point register"));
return;
}
arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (regcache->arch ());
if (regno == ARM_FPSCR_REGNUM && tdep->vfp_register_count != 0)
regcache->raw_supply (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr);
else if (regno >= ARM_D0_REGNUM
&& regno <= ARM_D0_REGNUM + tdep->vfp_register_count)
{
regcache->raw_supply (regno,
(char *) &vfp.vfp_regs[regno - ARM_D0_REGNUM]);
}
else
warning (_("Invalid register number."));
}
static void
fetch_fp_regs (struct regcache *regcache)
{
struct fpreg inferior_fp_registers;
int lwp = regcache->ptid ().lwp ();
int ret;
int regno;
ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
if (ret < 0)
{
warning (_("unable to fetch general registers"));
return;
}
arm_supply_vfpregset (regcache, &inferior_fp_registers);
}
void
arm_netbsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
{
if (regno >= 0)
{
if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
fetch_register (regcache, regno);
else
fetch_fp_register (regcache, regno);
}
else
{
fetch_register (regcache, -1);
fetch_fp_regs (regcache);
}
}
static void
store_register (const struct regcache *regcache, int regno)
{
struct gdbarch *gdbarch = regcache->arch ();
struct reg inferior_registers;
int lwp = regcache->ptid ().lwp ();
int ret;
ret = ptrace (PT_GETREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &inferior_registers, lwp);
if (ret < 0)
{
warning (_("unable to fetch general registers"));
return;
}
switch (regno)
{
case ARM_SP_REGNUM:
regcache->raw_collect (ARM_SP_REGNUM, (char *) &inferior_registers.r_sp);
break;
case ARM_LR_REGNUM:
regcache->raw_collect (ARM_LR_REGNUM, (char *) &inferior_registers.r_lr);
break;
case ARM_PC_REGNUM:
if (arm_apcs_32)
regcache->raw_collect (ARM_PC_REGNUM,
(char *) &inferior_registers.r_pc);
else
{
unsigned pc_val;
regcache->raw_collect (ARM_PC_REGNUM, (char *) &pc_val);
pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val);
inferior_registers.r_pc ^= gdbarch_addr_bits_remove
(gdbarch, inferior_registers.r_pc);
inferior_registers.r_pc |= pc_val;
}
break;
case ARM_PS_REGNUM:
if (arm_apcs_32)
regcache->raw_collect (ARM_PS_REGNUM,
(char *) &inferior_registers.r_cpsr);
else
{
unsigned psr_val;
regcache->raw_collect (ARM_PS_REGNUM, (char *) &psr_val);
psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val);
inferior_registers.r_pc = gdbarch_addr_bits_remove
(gdbarch, inferior_registers.r_pc);
inferior_registers.r_pc |= psr_val;
}
break;
default:
regcache->raw_collect (regno, (char *) &inferior_registers.r[regno]);
break;
}
ret = ptrace (PT_SETREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &inferior_registers, lwp);
if (ret < 0)
warning (_("unable to write register %d to inferior"), regno);
}
static void
store_regs (const struct regcache *regcache)
{
struct gdbarch *gdbarch = regcache->arch ();
struct reg inferior_registers;
int lwp = regcache->ptid ().lwp ();
int ret;
int regno;
for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++)
regcache->raw_collect (regno, (char *) &inferior_registers.r[regno]);
regcache->raw_collect (ARM_SP_REGNUM, (char *) &inferior_registers.r_sp);
regcache->raw_collect (ARM_LR_REGNUM, (char *) &inferior_registers.r_lr);
if (arm_apcs_32)
{
regcache->raw_collect (ARM_PC_REGNUM, (char *) &inferior_registers.r_pc);
regcache->raw_collect (ARM_PS_REGNUM,
(char *) &inferior_registers.r_cpsr);
}
else
{
unsigned pc_val;
unsigned psr_val;
regcache->raw_collect (ARM_PC_REGNUM, (char *) &pc_val);
regcache->raw_collect (ARM_PS_REGNUM, (char *) &psr_val);
pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val);
psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val);
inferior_registers.r_pc = pc_val | psr_val;
}
ret = ptrace (PT_SETREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &inferior_registers, lwp);
if (ret < 0)
warning (_("unable to store general registers"));
}
static void
store_fp_register (const struct regcache *regcache, int regno)
{
struct fpreg inferior_fp_registers;
int lwp = regcache->ptid ().lwp ();
int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
struct vfpreg &vfp = inferior_fp_registers.fpr_vfp;
if (ret < 0)
{
warning (_("unable to fetch floating-point registers"));
return;
}
arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (regcache->arch ());
if (regno == ARM_FPSCR_REGNUM && tdep->vfp_register_count != 0)
regcache->raw_collect (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr);
else if (regno >= ARM_D0_REGNUM
&& regno <= ARM_D0_REGNUM + tdep->vfp_register_count)
{
regcache->raw_collect (regno,
(char *) &vfp.vfp_regs[regno - ARM_D0_REGNUM]);
}
else
warning (_("Invalid register number."));
ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
if (ret < 0)
warning (_("unable to write register %d to inferior"), regno);
}
static void
store_fp_regs (const struct regcache *regcache)
{
arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (regcache->arch ());
int lwp = regcache->ptid ().lwp ();
if (tdep->vfp_register_count == 0)
return;
struct fpreg fpregs;
for (int regno = 0; regno <= tdep->vfp_register_count; regno++)
regcache->raw_collect
(regno + ARM_D0_REGNUM, (char *) &fpregs.fpr_vfp.vfp_regs[regno]);
regcache->raw_collect (ARM_FPSCR_REGNUM,
(char *) &fpregs.fpr_vfp.vfp_fpscr);
int ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &fpregs, lwp);
if (ret < 0)
warning (_("unable to store floating-point registers"));
}
void
arm_netbsd_nat_target::store_registers (struct regcache *regcache, int regno)
{
if (regno >= 0)
{
if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
store_register (regcache, regno);
else
store_fp_register (regcache, regno);
}
else
{
store_regs (regcache);
store_fp_regs (regcache);
}
}
const struct target_desc *
arm_netbsd_nat_target::read_description ()
{
int flag;
size_t len = sizeof (flag);
if (sysctlbyname("machdep.fpu_present", &flag, &len, NULL, 0) != 0
|| !flag)
return arm_read_description (ARM_FP_TYPE_NONE, false);
len = sizeof(flag);
if (sysctlbyname("machdep.neon_present", &flag, &len, NULL, 0) == 0 && flag)
return aarch32_read_description ();
return arm_read_description (ARM_FP_TYPE_VFPV3, false);
}
void _initialize_arm_netbsd_nat ();
void
_initialize_arm_netbsd_nat ()
{
add_inf_child_target (&the_arm_netbsd_nat_target);
}
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