| /* Target-dependent code for GNU/Linux on OpenRISC processors. |
| Copyright (C) 2018-2021 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 "or1k-tdep.h" |
| #include "osabi.h" |
| #include "glibc-tdep.h" |
| #include "linux-tdep.h" |
| #include "solib-svr4.h" |
| #include "regset.h" |
| #include "tramp-frame.h" |
| #include "trad-frame.h" |
| #include "gdbarch.h" |
| |
| /* Define the general register mapping. The kernel puts the PC at offset 0, |
| gdb puts it at offset 32. Register x0 is always 0 and can be ignored. |
| Registers x1 to x31 are in the same place. */ |
| |
| static const struct regcache_map_entry or1k_linux_gregmap[] = |
| { |
| { 32, OR1K_ZERO_REGNUM, 4 }, /* r0 to r31 */ |
| { 1, OR1K_NPC_REGNUM, 4 }, |
| { 0 } |
| }; |
| |
| /* Define the general register regset. */ |
| |
| static const struct regset or1k_linux_gregset = |
| { |
| or1k_linux_gregmap, regcache_supply_regset, regcache_collect_regset |
| }; |
| |
| /* Define hook for core file support. */ |
| |
| static void |
| or1k_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| iterate_over_regset_sections_cb *cb, |
| void *cb_data, |
| const struct regcache *regcache) |
| { |
| cb (".reg", (33 * 4), (33 * 4), &or1k_linux_gregset, NULL, cb_data); |
| } |
| |
| /* Signal trampoline support. */ |
| |
| static void or1k_linux_sigframe_init (const struct tramp_frame *self, |
| struct frame_info *this_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func); |
| |
| #define OR1K_RT_SIGRETURN 139 |
| |
| #define OR1K_INST_L_ORI_R11_R0_IMM 0xa9600000 |
| #define OR1K_INST_L_SYS_1 0x20000001 |
| #define OR1K_INST_L_NOP 0x15000000 |
| |
| static const struct tramp_frame or1k_linux_sigframe = { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { OR1K_INST_L_ORI_R11_R0_IMM | OR1K_RT_SIGRETURN, ULONGEST_MAX }, |
| { OR1K_INST_L_SYS_1, ULONGEST_MAX }, |
| { OR1K_INST_L_NOP, ULONGEST_MAX }, |
| { TRAMP_SENTINEL_INSN } |
| }, |
| or1k_linux_sigframe_init, |
| NULL |
| }; |
| |
| /* Runtime signal frames look like this: |
| struct rt_sigframe { |
| struct siginfo info; |
| struct ucontext uc; |
| unsigned char retcode[16]; |
| }; |
| |
| struct ucontext { |
| unsigned long uc_flags; - 4 |
| struct ucontext *uc_link; - 4 |
| stack_t uc_stack; - 4 * 3 |
| struct sigcontext uc_mcontext; |
| sigset_t uc_sigmask; |
| }; |
| |
| struct sigcontext { |
| struct user_regs_struct regs; |
| unsigned long oldmask; |
| }; |
| |
| struct user_regs_struct { |
| unsigned long gpr[32]; |
| unsigned long pc; |
| unsigned long sr; |
| }; */ |
| |
| #define SIGFRAME_SIGINFO_SIZE 128 |
| #define UCONTEXT_MCONTEXT_OFFSET 20 |
| |
| static void |
| or1k_linux_sigframe_init (const struct tramp_frame *self, |
| struct frame_info *this_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func) |
| { |
| CORE_ADDR frame_sp = get_frame_sp (this_frame); |
| CORE_ADDR mcontext_base; |
| CORE_ADDR regs_base; |
| |
| mcontext_base = frame_sp + SIGFRAME_SIGINFO_SIZE + UCONTEXT_MCONTEXT_OFFSET; |
| |
| /* Handle the general registers 0-31 followed by the PC. */ |
| regs_base = mcontext_base; |
| for (int i = 0; i < 32; i++) |
| trad_frame_set_reg_addr (this_cache, OR1K_ZERO_REGNUM + i, |
| regs_base + (i * 4)); |
| trad_frame_set_reg_addr (this_cache, OR1K_NPC_REGNUM, regs_base + (32 * 4)); |
| trad_frame_set_reg_addr (this_cache, OR1K_SR_REGNUM, regs_base + (33 * 4)); |
| |
| /* Choice of the bottom of the sigframe is somewhat arbitrary. */ |
| trad_frame_set_id (this_cache, frame_id_build (frame_sp, func)); |
| } |
| |
| /* Initialize OpenRISC Linux ABI info. */ |
| |
| static void |
| or1k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| linux_init_abi (info, gdbarch, 0); |
| |
| set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| linux_ilp32_fetch_link_map_offsets); |
| |
| /* GNU/Linux uses SVR4-style shared libraries. */ |
| set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| |
| /* GNU/Linux uses the dynamic linker included in the GNU C Library. */ |
| set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); |
| |
| /* Enable TLS support. */ |
| set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| svr4_fetch_objfile_link_map); |
| |
| set_gdbarch_iterate_over_regset_sections |
| (gdbarch, or1k_linux_iterate_over_regset_sections); |
| |
| tramp_frame_prepend_unwinder (gdbarch, &or1k_linux_sigframe); |
| } |
| |
| /* Initialize OpenRISC Linux target support. */ |
| |
| void _initialize_or1k_linux_tdep (); |
| void |
| _initialize_or1k_linux_tdep () |
| { |
| gdbarch_register_osabi (bfd_arch_or1k, 0, GDB_OSABI_LINUX, |
| or1k_linux_init_abi); |
| } |