/* Target-dependent code for NetBSD/arm. Copyright (C) 2002-2023 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 "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(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) { /* XXX Use uint32_t instead of CORE_ADDR (aka uint64_t; see gdbsupport/common-types.h). Otherwise, zero-filled word will be stored for big-endian targets. */ uint32_t 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 (gdbarch); tdep->lowest_pc = 0x8000; /* For armv[67]eb (BE8), insns are encoded in little-endian. Therefore, we cannot use info.byte_order here. */ switch (info.byte_order_for_code) { 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 (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); }