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- /* Target-dependent code for Xilinx MicroBlaze.
- Copyright (C) 2009-2022 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);
- }
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