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/* Target-dependent code for NetBSD/arm.
Copyright (C) 2002-2024 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/>. */
#include "osabi.h"
#include "arch/arm.h"
#include "arm-netbsd-tdep.h"
#include "netbsd-tdep.h"
#include "arm-tdep.h"
#include "regset.h"
#include "solib-svr4.h"
/* Description of the longjmp buffer. */
#define ARM_NBSD_JB_PC 24
#define ARM_NBSD_JB_ELEMENT_SIZE ARM_INT_REGISTER_SIZE
/* For compatibility with previous implementations of GDB on arm/NetBSD,
override the default little-endian breakpoint. */
static const gdb_byte arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
static const gdb_byte arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
static const gdb_byte arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
static const gdb_byte arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
/* This matches struct reg from NetBSD's sys/arch/arm/include/reg.h:
https://github.com/NetBSD/src/blob/7c13e6e6773bb171f4ed3ed53013e9d24b3c1eac/sys/arch/arm/include/reg.h#L39
*/
struct arm_nbsd_reg
{
uint32_t reg[13];
uint32_t sp;
uint32_t lr;
uint32_t pc;
uint32_t cpsr;
};
void
arm_nbsd_supply_gregset (const struct regset *regset, struct regcache *regcache,
int regnum, const void *gregs, size_t len)
{
const arm_nbsd_reg *gregset = static_cast<const arm_nbsd_reg *>(gregs);
gdb_assert (len >= sizeof (arm_nbsd_reg));
/* Integer registers. */
for (int i = ARM_A1_REGNUM; i < ARM_SP_REGNUM; i++)
if (regnum == -1 || regnum == i)
regcache->raw_supply (i, (char *) &gregset->reg[i]);
if (regnum == -1 || regnum == ARM_SP_REGNUM)
regcache->raw_supply (ARM_SP_REGNUM, (char *) &gregset->sp);
if (regnum == -1 || regnum == ARM_LR_REGNUM)
regcache->raw_supply (ARM_LR_REGNUM, (char *) &gregset->lr);
if (regnum == -1 || regnum == ARM_PC_REGNUM)
{
CORE_ADDR r_pc = gdbarch_addr_bits_remove (regcache->arch (), gregset->pc);
regcache->raw_supply (ARM_PC_REGNUM, (char *) &r_pc);
}
if (regnum == -1 || regnum == ARM_PS_REGNUM)
{
if (arm_apcs_32)
regcache->raw_supply (ARM_PS_REGNUM, (char *) &gregset->cpsr);
else
regcache->raw_supply (ARM_PS_REGNUM, (char *) &gregset->pc);
}
}
static const struct regset arm_nbsd_regset = {
nullptr,
arm_nbsd_supply_gregset,
/* We don't need a collect function because we only use this reading registers
(via iterate_over_regset_sections and fetch_regs/fetch_register). */
nullptr,
0
};
static void
arm_nbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
iterate_over_regset_sections_cb *cb,
void *cb_data,
const struct regcache *regcache)
{
cb (".reg", sizeof (arm_nbsd_reg), sizeof (arm_nbsd_reg), &arm_nbsd_regset,
NULL, cb_data);
/* cbiesinger/2020-02-12 -- as far as I can tell, ARM/NetBSD does
not write any floating point registers into the core file (tested
with NetBSD 9.1_RC1). When it does, this function will need to read them,
and the arm-netbsd gdbarch will need a core_read_description function
to return the right description for them. */
}
static void
arm_netbsd_init_abi_common (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (gdbarch);
tdep->lowest_pc = 0x8000;
switch (info.byte_order)
{
case BFD_ENDIAN_LITTLE:
tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
break;
case BFD_ENDIAN_BIG:
tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
break;
default:
internal_error (_("arm_gdbarch_init: bad byte order for float format"));
}
tdep->jb_pc = ARM_NBSD_JB_PC;
tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
set_gdbarch_iterate_over_regset_sections
(gdbarch, arm_nbsd_iterate_over_regset_sections);
/* Single stepping. */
set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
}
static void
arm_netbsd_elf_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (gdbarch);
arm_netbsd_init_abi_common (info, gdbarch);
nbsd_init_abi (info, gdbarch);
if (tdep->fp_model == ARM_FLOAT_AUTO)
tdep->fp_model = ARM_FLOAT_SOFT_VFP;
/* NetBSD ELF uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
}
void _initialize_arm_netbsd_tdep ();
void
_initialize_arm_netbsd_tdep ()
{
gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD,
arm_netbsd_elf_init_abi);
}
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