| /* Target-dependent code for Xilinx MicroBlaze. |
| |
| Copyright (C) 2009-2021 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 "frame.h" |
| #include "inferior.h" |
| #include "symtab.h" |
| #include "target.h" |
| #include "gdbcore.h" |
| #include "gdbcmd.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "regcache.h" |
| #include "value.h" |
| #include "osabi.h" |
| #include "regset.h" |
| #include "solib-svr4.h" |
| #include "microblaze-tdep.h" |
| #include "trad-frame.h" |
| #include "frame-unwind.h" |
| #include "tramp-frame.h" |
| #include "linux-tdep.h" |
| |
| static int |
| microblaze_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, |
| struct bp_target_info *bp_tgt) |
| { |
| CORE_ADDR addr = bp_tgt->reqstd_address; |
| const gdb_byte *bp; |
| int val; |
| int bplen; |
| gdb_byte old_contents[BREAKPOINT_MAX]; |
| |
| /* Determine appropriate breakpoint contents and size for this address. */ |
| bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen); |
| |
| val = target_read_memory (addr, old_contents, bplen); |
| |
| /* If our breakpoint is no longer at the address, this means that the |
| program modified the code on us, so it is wrong to put back the |
| old value. */ |
| if (val == 0 && memcmp (bp, old_contents, bplen) == 0) |
| val = target_write_raw_memory (addr, bp_tgt->shadow_contents, bplen); |
| |
| return val; |
| } |
| |
| static void |
| microblaze_linux_sigtramp_cache (struct frame_info *next_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func, LONGEST offset, |
| int bias) |
| { |
| CORE_ADDR base; |
| CORE_ADDR gpregs; |
| int regnum; |
| |
| base = frame_unwind_register_unsigned (next_frame, MICROBLAZE_SP_REGNUM); |
| if (bias > 0 && get_frame_address_in_block (next_frame) != func) |
| /* See below, some signal trampolines increment the stack as their |
| first instruction, need to compensate for that. */ |
| base -= bias; |
| |
| /* Find the address of the register buffer. */ |
| gpregs = base + offset; |
| |
| /* Registers saved on stack. */ |
| for (regnum = 0; regnum < MICROBLAZE_BTR_REGNUM; regnum++) |
| trad_frame_set_reg_addr (this_cache, regnum, |
| gpregs + regnum * MICROBLAZE_REGISTER_SIZE); |
| trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| } |
| |
| |
| static void |
| microblaze_linux_sighandler_cache_init (const struct tramp_frame *self, |
| struct frame_info *next_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func) |
| { |
| microblaze_linux_sigtramp_cache (next_frame, this_cache, func, |
| 0 /* Offset to ucontext_t. */ |
| + 24 /* Offset to .reg. */, |
| 0); |
| } |
| |
| static struct tramp_frame microblaze_linux_sighandler_tramp_frame = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0x31800077, ULONGEST_MAX }, /* addik R12,R0,119. */ |
| { 0xb9cc0008, ULONGEST_MAX }, /* brki R14,8. */ |
| { TRAMP_SENTINEL_INSN }, |
| }, |
| microblaze_linux_sighandler_cache_init |
| }; |
| |
| |
| static void |
| microblaze_linux_init_abi (struct gdbarch_info info, |
| struct gdbarch *gdbarch) |
| { |
| linux_init_abi (info, gdbarch, 0); |
| |
| set_gdbarch_memory_remove_breakpoint (gdbarch, |
| microblaze_linux_memory_remove_breakpoint); |
| |
| /* Shared library handling. */ |
| set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| linux_ilp32_fetch_link_map_offsets); |
| |
| /* Trampolines. */ |
| tramp_frame_prepend_unwinder (gdbarch, |
| µblaze_linux_sighandler_tramp_frame); |
| } |
| |
| void _initialize_microblaze_linux_tdep (); |
| void |
| _initialize_microblaze_linux_tdep () |
| { |
| gdbarch_register_osabi (bfd_arch_microblaze, 0, GDB_OSABI_LINUX, |
| microblaze_linux_init_abi); |
| } |