| /* 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); |
| } |