1/* Target-dependent code for Xilinx MicroBlaze. 2 3 Copyright 2009, 2010, 2011 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 40static int 41microblaze_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, 42 struct bp_target_info *bp_tgt) 43{ 44 CORE_ADDR addr = bp_tgt->placed_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 if (bp == NULL) 53 error (_("Software breakpoints not implemented for this target.")); 54 55 val = target_read_memory (addr, old_contents, bplen); 56 57 /* If our breakpoint is no longer at the address, this means that the 58 program modified the code on us, so it is wrong to put back the 59 old value. */ 60 if (val == 0 && memcmp (bp, old_contents, bplen) == 0) 61 val = target_write_memory (addr, bp_tgt->shadow_contents, bplen); 62 63 return val; 64} 65 66static void 67microblaze_linux_sigtramp_cache (struct frame_info *next_frame, 68 struct trad_frame_cache *this_cache, 69 CORE_ADDR func, LONGEST offset, 70 int bias) 71{ 72 CORE_ADDR base; 73 CORE_ADDR gpregs; 74 int regnum; 75 struct gdbarch *gdbarch = get_frame_arch (next_frame); 76 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 77 78 base = frame_unwind_register_unsigned (next_frame, MICROBLAZE_SP_REGNUM); 79 if (bias > 0 && get_frame_address_in_block (next_frame) != func) 80 /* See below, some signal trampolines increment the stack as their 81 first instruction, need to compensate for that. */ 82 base -= bias; 83 84 /* Find the address of the register buffer. */ 85 gpregs = base + offset; 86 87 /* Registers saved on stack. */ 88 for (regnum = 0; regnum < MICROBLAZE_BTR_REGNUM; regnum++) 89 trad_frame_set_reg_addr (this_cache, regnum, 90 gpregs + regnum * MICROBLAZE_REGISTER_SIZE); 91 trad_frame_set_id (this_cache, frame_id_build (base, func)); 92} 93 94 95static void 96microblaze_linux_sighandler_cache_init (const struct tramp_frame *self, 97 struct frame_info *next_frame, 98 struct trad_frame_cache *this_cache, 99 CORE_ADDR func) 100{ 101 microblaze_linux_sigtramp_cache (next_frame, this_cache, func, 102 0 /* Offset to ucontext_t. */ 103 + 24 /* Offset to .reg. */, 104 0); 105} 106 107static struct tramp_frame microblaze_linux_sighandler_tramp_frame = 108{ 109 SIGTRAMP_FRAME, 110 4, 111 { 112 { 0x31800077, -1 }, /* addik R12,R0,119. */ 113 { 0xb9cc0008, -1 }, /* brki R14,8. */ 114 { TRAMP_SENTINEL_INSN }, 115 }, 116 microblaze_linux_sighandler_cache_init 117}; 118 119 120static void 121microblaze_linux_init_abi (struct gdbarch_info info, 122 struct gdbarch *gdbarch) 123{ 124 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 125 126 linux_init_abi (info, gdbarch); 127 128 set_gdbarch_memory_remove_breakpoint (gdbarch, 129 microblaze_linux_memory_remove_breakpoint); 130 131 /* Shared library handling. */ 132 set_solib_svr4_fetch_link_map_offsets (gdbarch, 133 svr4_ilp32_fetch_link_map_offsets); 134 135 /* Trampolines. */ 136 tramp_frame_prepend_unwinder (gdbarch, 137 µblaze_linux_sighandler_tramp_frame); 138} 139 140void 141_initialize_microblaze_linux_tdep (void) 142{ 143 gdbarch_register_osabi (bfd_arch_microblaze, 0, GDB_OSABI_LINUX, 144 microblaze_linux_init_abi); 145} 146