8b55a7e4e5
gdbarch_breakpoint_from_pc doesn't return NULL except for ia64_breakpoint_from_pc, and we checked its return value in three places. In microblaze_linux_memory_remove_breakpoint and ppc_linux_memory_remove_breakpoint, gdbarch_breakpoint_from_pc never returns NULL, so we can remove the NULL checking. In default_memory_insert_breakpoint, gdbarch_breakpoint_from_pc can't returns NULL too because ia64 defines its own memory_insert_breakpoint. gdb: 2016-11-03 Yao Qi <yao.qi@linaro.org> * mem-break.c (default_memory_insert_breakpoint): Don't check 'bp' against NULL. * microblaze-linux-tdep.c (microblaze_linux_memory_remove_breakpoint): Likewise. * ppc-linux-tdep.c (ppc_linux_memory_remove_breakpoint): Likewise.
147 lines
4.2 KiB
C
147 lines
4.2 KiB
C
/* Target-dependent code for Xilinx MicroBlaze.
|
|
|
|
Copyright (C) 2009-2016 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;
|
|
struct gdbarch *gdbarch = get_frame_arch (next_frame);
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
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, -1 }, /* addik R12,R0,119. */
|
|
{ 0xb9cc0008, -1 }, /* brki R14,8. */
|
|
{ TRAMP_SENTINEL_INSN },
|
|
},
|
|
microblaze_linux_sighandler_cache_init
|
|
};
|
|
|
|
|
|
static void
|
|
microblaze_linux_init_abi (struct gdbarch_info info,
|
|
struct gdbarch *gdbarch)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
linux_init_abi (info, gdbarch);
|
|
|
|
set_gdbarch_memory_remove_breakpoint (gdbarch,
|
|
microblaze_linux_memory_remove_breakpoint);
|
|
|
|
/* Shared library handling. */
|
|
set_solib_svr4_fetch_link_map_offsets (gdbarch,
|
|
svr4_ilp32_fetch_link_map_offsets);
|
|
|
|
/* Trampolines. */
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
µblaze_linux_sighandler_tramp_frame);
|
|
}
|
|
|
|
/* -Wmissing-prototypes */
|
|
extern initialize_file_ftype _initialize_microblaze_linux_tdep;
|
|
|
|
void
|
|
_initialize_microblaze_linux_tdep (void)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_microblaze, 0, GDB_OSABI_LINUX,
|
|
microblaze_linux_init_abi);
|
|
}
|