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/tmp/gdb-7.10/gdb/bfin-linux-tdep.c
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1 /* Target-dependent code for Analog Devices Blackfin processor, for GDB.
2 
3  Copyright (C) 2005-2015 Free Software Foundation, Inc.
4 
5  Contributed by Analog Devices, Inc.
6 
7  This file is part of GDB.
8 
9  This program is free software; you can redistribute it and/or modify
10  it under the terms of the GNU General Public License as published by
11  the Free Software Foundation; either version 3 of the License, or
12  (at your option) any later version.
13 
14  This program is distributed in the hope that it will be useful,
15  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  GNU General Public License for more details.
18 
19  You should have received a copy of the GNU General Public License
20  along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 
22 #include "defs.h"
23 #include "arch-utils.h"
24 #include "regcache.h"
25 #include "tramp-frame.h"
26 #include "trad-frame.h"
27 #include "osabi.h"
28 #include "xml-syscall.h"
29 #include "linux-tdep.h"
30 #include "bfin-tdep.h"
31 
32 /* From <asm/sigcontext.h>. */
33 
34 #define SIGCONTEXT_OFFSET 168
35 
37 {
38  0 * 4, /* %r0 */
39  1 * 4, /* %r1 */
40  2 * 4, /* %r2 */
41  3 * 4, /* %r3 */
42  4 * 4, /* %r4 */
43  5 * 4, /* %r5 */
44  6 * 4, /* %r6 */
45  7 * 4, /* %r7 */
46  8 * 4, /* %p0 */
47  9 * 4, /* %p1 */
48  10 * 4, /* %p2 */
49  11 * 4, /* %p3 */
50  12 * 4, /* %p4 */
51  13 * 4, /* %p5 */
52  14 * 4, /* %sp */
53  23 * 4, /* %fp */
54  24 * 4, /* %i0 */
55  25 * 4, /* %i1 */
56  26 * 4, /* %i2 */
57  27 * 4, /* %i3 */
58  28 * 4, /* %m0 */
59  29 * 4, /* %m1 */
60  30 * 4, /* %m2 */
61  31 * 4, /* %m3 */
62  36 * 4, /* %b0 */
63  37 * 4, /* %b1 */
64  38 * 4, /* %b2 */
65  39 * 4, /* %b3 */
66  32 * 4, /* %l0 */
67  33 * 4, /* %l1 */
68  34 * 4, /* %l2 */
69  35 * 4, /* %l3 */
70  17 * 4, /* %a0x */
71  15 * 4, /* %a0w */
72  18 * 4, /* %a1x */
73  16 * 4, /* %a1w */
74  19 * 4, /* %astat */
75  20 * 4, /* %rets */
76  40 * 4, /* %lc0 */
77  42 * 4, /* %lt0 */
78  44 * 4, /* %lb0 */
79  41 * 4, /* %lc1 */
80  43 * 4, /* %lt1 */
81  45 * 4, /* %lb1 */
82  -1, /* %cycles */
83  -1, /* %cycles2 */
84  -1, /* %usp */
85  46 * 4, /* %seqstat */
86  -1, /* syscfg */
87  21 * 4, /* %reti */
88  22 * 4, /* %retx */
89  -1, /* %retn */
90  -1, /* %rete */
91  21 * 4, /* %pc */
92 };
93 
94 /* Signal trampolines. */
95 
96 static void
98  struct frame_info *this_frame,
99  struct trad_frame_cache *this_cache,
100  CORE_ADDR func)
101 {
102  struct gdbarch *gdbarch = get_frame_arch (this_frame);
103  CORE_ADDR sp = get_frame_sp (this_frame);
104  CORE_ADDR pc = get_frame_pc (this_frame);
105  CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET;
107  int i;
108 
109  for (i = 0; i < BFIN_NUM_REGS; i++)
110  if (reg_offset[i] != -1)
111  trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]);
112 
113  /* This would come after the LINK instruction in the ret_from_signal
114  function, hence the frame id would be SP + 8. */
115  trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc));
116 }
117 
118 static const struct tramp_frame bfin_linux_sigframe =
119 {
121  4,
122  {
123  { 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */
124  { 0x00A0, 0xffff }, /* EXCPT 0; */
125  { TRAMP_SENTINEL_INSN, -1 },
126  },
128 };
129 
130 static LONGEST
132  ptid_t ptid)
133 {
134  struct regcache *regcache = get_thread_regcache (ptid);
135  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
136  /* The content of a register. */
137  gdb_byte buf[4];
138  /* The result. */
139  LONGEST ret;
140 
141  /* Getting the system call number from the register.
142  When dealing with Blackfin architecture, this information
143  is stored at %p0 register. */
144  regcache_cooked_read (regcache, BFIN_P0_REGNUM, buf);
145 
146  ret = extract_signed_integer (buf, 4, byte_order);
147 
148  return ret;
149 }
150 
151 static void
153 {
154  linux_init_abi (info, gdbarch);
155 
156  /* Set the sigtramp frame sniffer. */
157  tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe);
158 
159  /* Functions for 'catch syscall'. */
160  set_xml_syscall_file_name (gdbarch, "syscalls/bfin-linux.xml");
163 }
164 
165 /* Provide a prototype to silence -Wmissing-prototypes. */
167 
168 void
170 {
171  gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX,
173 }
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_pc(struct frame_info *frame)
Definition: frame.c:2217
#define BFIN_NUM_REGS
Definition: bfin-tdep.h:84
bfd_vma CORE_ADDR
Definition: common-types.h:41
#define TRAMP_SENTINEL_INSN
Definition: tramp-frame.h:44
struct regcache * get_thread_regcache(ptid_t ptid)
Definition: regcache.c:529
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
CORE_ADDR get_frame_sp(struct frame_info *this_frame)
Definition: frame.c:2577
static int reg_offset[]
Definition: i386gnu-nat.c:42
void linux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition: linux-tdep.c:2427
Definition: ptid.h:35
#define SIGCONTEXT_OFFSET
void initialize_file_ftype(void)
Definition: defs.h:281
static LONGEST bfin_linux_get_syscall_number(struct gdbarch *gdbarch, ptid_t ptid)
enum bfd_endian gdbarch_byte_order(struct gdbarch *gdbarch)
Definition: gdbarch.c:1420
static void bfin_linux_sigframe_init(const struct tramp_frame *self, struct frame_info *this_frame, struct trad_frame_cache *this_cache, CORE_ADDR func)
void set_xml_syscall_file_name(struct gdbarch *gdbarch, const char *name)
Definition: xml-syscall.c:392
bfd_byte gdb_byte
Definition: common-types.h:38
void set_gdbarch_get_syscall_number(struct gdbarch *gdbarch, gdbarch_get_syscall_number_ftype get_syscall_number)
Definition: gdbarch.c:4025
void tramp_frame_prepend_unwinder(struct gdbarch *gdbarch, const struct tramp_frame *tramp_frame)
Definition: tramp-frame.c:145
enum register_status regcache_cooked_read(struct regcache *regcache, int regnum, gdb_byte *buf)
Definition: regcache.c:737
static void bfin_linux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
LONGEST extract_signed_integer(const gdb_byte *, int, enum bfd_endian)
Definition: findvar.c:49
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
static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS]
struct gdbarch * get_frame_arch(struct frame_info *this_frame)
Definition: frame.c:2535
initialize_file_ftype _initialize_bfin_linux_tdep
long long LONGEST
Definition: common-types.h:52