GDB (xrefs)
/tmp/gdb-7.10/gdb/microblaze-linux-tdep.c
Go to the documentation of this file.
1 /* Target-dependent code for Xilinx MicroBlaze.
2 
3  Copyright (C) 2009-2015 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
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  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_raw_memory (addr, bp_tgt->shadow_contents, bplen);
62 
63  return val;
64 }
65 
66 static void
68  struct trad_frame_cache *this_cache,
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 
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 
95 static void
97  struct frame_info *next_frame,
98  struct trad_frame_cache *this_cache,
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 
107 static struct tramp_frame microblaze_linux_sighandler_tramp_frame =
108 {
110  4,
111  {
112  { 0x31800077, -1 }, /* addik R12,R0,119. */
113  { 0xb9cc0008, -1 }, /* brki R14,8. */
115  },
117 };
118 
119 
120 static void
122  struct gdbarch *gdbarch)
123 {
124  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
125 
126  linux_init_abi (info, gdbarch);
127 
130 
131  /* Shared library handling. */
134 
135  /* Trampolines. */
137  &microblaze_linux_sighandler_tramp_frame);
138 }
139 
140 /* -Wmissing-prototypes */
142 
143 void
145 {
146  gdbarch_register_osabi (bfd_arch_microblaze, 0, GDB_OSABI_LINUX,
148 }
CORE_ADDR reqstd_address
Definition: breakpoint.h:235
void trad_frame_set_reg_addr(struct trad_frame_cache *this_trad_cache, int regnum, CORE_ADDR addr)
Definition: trad-frame.c:119
struct frame_id frame_id_build(CORE_ADDR stack_addr, CORE_ADDR code_addr)
Definition: frame.c:554
CORE_ADDR get_frame_address_in_block(struct frame_info *this_frame)
Definition: frame.c:2248
bfd_vma CORE_ADDR
Definition: common-types.h:41
static void microblaze_linux_sigtramp_cache(struct frame_info *next_frame, struct trad_frame_cache *this_cache, CORE_ADDR func, LONGEST offset, int bias)
#define TRAMP_SENTINEL_INSN
Definition: tramp-frame.h:44
void(* func)(char *)
void trad_frame_set_id(struct trad_frame_cache *this_trad_cache, struct frame_id this_id)
Definition: trad-frame.c:164
ULONGEST frame_unwind_register_unsigned(struct frame_info *frame, int regnum)
Definition: frame.c:1182
static void microblaze_linux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
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)
void linux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition: linux-tdep.c:2427
struct link_map_offsets * svr4_ilp32_fetch_link_map_offsets(void)
Definition: solib-svr4.c:3149
#define _(String)
Definition: gdb_locale.h:40
struct gdbarch_tdep * gdbarch_tdep(struct gdbarch *gdbarch)
Definition: gdbarch.c:1402
void initialize_file_ftype(void)
Definition: defs.h:281
#define MICROBLAZE_REGISTER_SIZE
#define BREAKPOINT_MAX
Definition: breakpoint.h:46
gdb_byte shadow_contents[BREAKPOINT_MAX]
Definition: breakpoint.h:245
int target_write_raw_memory(CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
Definition: target.c:1492
void set_solib_svr4_fetch_link_map_offsets(struct gdbarch *gdbarch, struct link_map_offsets *(*flmo)(void))
Definition: solib-svr4.c:3108
static int microblaze_linux_memory_remove_breakpoint(struct gdbarch *gdbarch, struct bp_target_info *bp_tgt)
int regnum
Definition: aarch64-tdep.c:69
bfd_byte gdb_byte
Definition: common-types.h:38
initialize_file_ftype _initialize_microblaze_linux_tdep
int target_read_memory(CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
Definition: target.c:1393
const gdb_byte * gdbarch_breakpoint_from_pc(struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr)
Definition: gdbarch.c:2662
int offset
Definition: agent.c:65
void tramp_frame_prepend_unwinder(struct gdbarch *gdbarch, const struct tramp_frame *tramp_frame)
Definition: tramp-frame.c:145
void set_gdbarch_memory_remove_breakpoint(struct gdbarch *gdbarch, gdbarch_memory_remove_breakpoint_ftype memory_remove_breakpoint)
Definition: gdbarch.c:2747
void gdbarch_register_osabi(enum bfd_architecture arch, unsigned long machine, enum gdb_osabi osabi, void(*init_osabi)(struct gdbarch_info, struct gdbarch *))
Definition: osabi.c:148
void error(const char *fmt,...)
Definition: errors.c:38
struct gdbarch * get_frame_arch(struct frame_info *this_frame)
Definition: frame.c:2535
long long LONGEST
Definition: common-types.h:52