| 1 | /* Target-dependent code for Xilinx MicroBlaze. |
| 2 | |
| 3 | Copyright (C) 2009-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "symtab.h" |
| 24 | #include "target.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "gdbcmd.h" |
| 27 | #include "symfile.h" |
| 28 | #include "objfiles.h" |
| 29 | #include "regcache.h" |
| 30 | #include "value.h" |
| 31 | #include "osabi.h" |
| 32 | #include "regset.h" |
| 33 | #include "solib-svr4.h" |
| 34 | #include "microblaze-tdep.h" |
| 35 | #include "trad-frame.h" |
| 36 | #include "frame-unwind.h" |
| 37 | #include "tramp-frame.h" |
| 38 | #include "linux-tdep.h" |
| 39 | |
| 40 | static int |
| 41 | microblaze_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, |
| 42 | struct bp_target_info *bp_tgt) |
| 43 | { |
| 44 | CORE_ADDR addr = bp_tgt->reqstd_address; |
| 45 | const gdb_byte *bp; |
| 46 | int val; |
| 47 | int bplen; |
| 48 | gdb_byte old_contents[BREAKPOINT_MAX]; |
| 49 | |
| 50 | /* Determine appropriate breakpoint contents and size for this address. */ |
| 51 | bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen); |
| 52 | |
| 53 | val = target_read_memory (addr, old_contents, bplen); |
| 54 | |
| 55 | /* If our breakpoint is no longer at the address, this means that the |
| 56 | program modified the code on us, so it is wrong to put back the |
| 57 | old value. */ |
| 58 | if (val == 0 && memcmp (bp, old_contents, bplen) == 0) |
| 59 | val = target_write_raw_memory (addr, bp_tgt->shadow_contents, bplen); |
| 60 | |
| 61 | return val; |
| 62 | } |
| 63 | |
| 64 | static void |
| 65 | microblaze_linux_sigtramp_cache (struct frame_info *next_frame, |
| 66 | struct trad_frame_cache *this_cache, |
| 67 | CORE_ADDR func, LONGEST offset, |
| 68 | int bias) |
| 69 | { |
| 70 | CORE_ADDR base; |
| 71 | CORE_ADDR gpregs; |
| 72 | int regnum; |
| 73 | |
| 74 | base = frame_unwind_register_unsigned (next_frame, MICROBLAZE_SP_REGNUM); |
| 75 | if (bias > 0 && get_frame_address_in_block (next_frame) != func) |
| 76 | /* See below, some signal trampolines increment the stack as their |
| 77 | first instruction, need to compensate for that. */ |
| 78 | base -= bias; |
| 79 | |
| 80 | /* Find the address of the register buffer. */ |
| 81 | gpregs = base + offset; |
| 82 | |
| 83 | /* Registers saved on stack. */ |
| 84 | for (regnum = 0; regnum < MICROBLAZE_BTR_REGNUM; regnum++) |
| 85 | trad_frame_set_reg_addr (this_cache, regnum, |
| 86 | gpregs + regnum * MICROBLAZE_REGISTER_SIZE); |
| 87 | trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| 88 | } |
| 89 | |
| 90 | |
| 91 | static void |
| 92 | microblaze_linux_sighandler_cache_init (const struct tramp_frame *self, |
| 93 | struct frame_info *next_frame, |
| 94 | struct trad_frame_cache *this_cache, |
| 95 | CORE_ADDR func) |
| 96 | { |
| 97 | microblaze_linux_sigtramp_cache (next_frame, this_cache, func, |
| 98 | 0 /* Offset to ucontext_t. */ |
| 99 | + 24 /* Offset to .reg. */, |
| 100 | 0); |
| 101 | } |
| 102 | |
| 103 | static struct tramp_frame microblaze_linux_sighandler_tramp_frame = |
| 104 | { |
| 105 | SIGTRAMP_FRAME, |
| 106 | 4, |
| 107 | { |
| 108 | { 0x31800077, -1 }, /* addik R12,R0,119. */ |
| 109 | { 0xb9cc0008, -1 }, /* brki R14,8. */ |
| 110 | { TRAMP_SENTINEL_INSN }, |
| 111 | }, |
| 112 | microblaze_linux_sighandler_cache_init |
| 113 | }; |
| 114 | |
| 115 | |
| 116 | static void |
| 117 | microblaze_linux_init_abi (struct gdbarch_info info, |
| 118 | struct gdbarch *gdbarch) |
| 119 | { |
| 120 | linux_init_abi (info, gdbarch); |
| 121 | |
| 122 | set_gdbarch_memory_remove_breakpoint (gdbarch, |
| 123 | microblaze_linux_memory_remove_breakpoint); |
| 124 | |
| 125 | /* Shared library handling. */ |
| 126 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| 127 | svr4_ilp32_fetch_link_map_offsets); |
| 128 | |
| 129 | /* Trampolines. */ |
| 130 | tramp_frame_prepend_unwinder (gdbarch, |
| 131 | µblaze_linux_sighandler_tramp_frame); |
| 132 | } |
| 133 | |
| 134 | void |
| 135 | _initialize_microblaze_linux_tdep (void) |
| 136 | { |
| 137 | gdbarch_register_osabi (bfd_arch_microblaze, 0, GDB_OSABI_LINUX, |
| 138 | microblaze_linux_init_abi); |
| 139 | } |