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- /* Target-dependent code for NetBSD/arm.
- Copyright (C) 2002-2022 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 "defs.h"
- #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 = (arm_gdbarch_tdep *) 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 (__FILE__, __LINE__,
- _("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 = (arm_gdbarch_tdep *) 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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