GDB (xrefs)

/tmp/gdb-8.1/gdb/bfin-linux-tdep.c
Go to the documentation of this file.
1 /* Target-dependent code for Analog Devices Blackfin processor, for GDB.
2
3 Copyright (C) 2005-2018 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
36 static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS] =
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
97 bfin_linux_sigframe_init (const struct tramp_frame *self,
98 struct frame_info *this_frame,
99 struct trad_frame_cache *this_cache,
100 CORE_ADDR func)
101 {
102 CORE_ADDR sp = get_frame_sp (this_frame);
103 CORE_ADDR pc = get_frame_pc (this_frame);
104 CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET;
105 const int *reg_offset = bfin_linux_sigcontext_reg_offset;
106 int i;
107
108 for (i = 0; i < BFIN_NUM_REGS; i++)
109 if (reg_offset[i] != -1)
110 trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]);
111
112 /* This would come after the LINK instruction in the ret_from_signal
113 function, hence the frame id would be SP + 8. */
114 trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc));
115 }
116
117 static const struct tramp_frame bfin_linux_sigframe =
118 {
119 SIGTRAMP_FRAME,
120 4,
121 {
122 { 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */
123 { 0x00A0, 0xffff }, /* EXCPT 0; */
124 { TRAMP_SENTINEL_INSN, -1 },
125 },
126 bfin_linux_sigframe_init,
127 };
128
129 static LONGEST
130 bfin_linux_get_syscall_number (struct gdbarch *gdbarch,
131 ptid_t ptid)
132 {
133 struct regcache *regcache = get_thread_regcache (ptid);
134 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
135 /* The content of a register. */
136 gdb_byte buf[4];
137 /* The result. */
138 LONGEST ret;
139
140 /* Getting the system call number from the register.
141 When dealing with Blackfin architecture, this information
142 is stored at %p0 register. */
143 regcache_cooked_read (regcache, BFIN_P0_REGNUM, buf);
144
145 ret = extract_signed_integer (buf, 4, byte_order);
146
147 return ret;
148 }
149
150 static void
151 bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
152 {
153 linux_init_abi (info, gdbarch);
154
155 /* Set the sigtramp frame sniffer. */
156 tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe);
157
158 /* Functions for 'catch syscall'. */
159 set_xml_syscall_file_name (gdbarch, "syscalls/bfin-linux.xml");
160 set_gdbarch_get_syscall_number (gdbarch,
161 bfin_linux_get_syscall_number);
162 }
163
164 void
165 _initialize_bfin_linux_tdep (void)
166 {
167 gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX,
168 bfin_linux_init_abi);
169 }
BFIN_P0_REGNUM
Definition: bfin-tdep.h:32
gdbarch
Definition: gdbarch.c:127
reg_offset
static int reg_offset[]
Definition: i386-gnu-nat.c:46
trad_frame_set_reg_addr
void trad_frame_set_reg_addr(struct trad_frame_cache *this_trad_cache, int regnum, CORE_ADDR addr)
Definition: trad-frame.c:126
frame_id_build
struct frame_id frame_id_build(CORE_ADDR stack_addr, CORE_ADDR code_addr)
Definition: frame.c:624
get_frame_pc
CORE_ADDR get_frame_pc(struct frame_info *frame)
Definition: frame.c:2376
BFIN_NUM_REGS
#define BFIN_NUM_REGS
Definition: bfin-tdep.h:84
CORE_ADDR
bfd_vma CORE_ADDR
Definition: common-types.h:41
TRAMP_SENTINEL_INSN
#define TRAMP_SENTINEL_INSN
Definition: tramp-frame.h:44
get_thread_regcache
struct regcache * get_thread_regcache(ptid_t ptid)
Definition: regcache.c:434
func
void(* func)(char *)
Definition: remote-fileio.c:1104
trad_frame_set_id
void trad_frame_set_id(struct trad_frame_cache *this_trad_cache, struct frame_id this_id)
Definition: trad-frame.c:171
GDB_OSABI_LINUX
Definition: defs.h:517
get_frame_sp
CORE_ADDR get_frame_sp(struct frame_info *this_frame)
Definition: frame.c:2782
linux_init_abi
void linux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition: linux-tdep.c:2492
SIGTRAMP_FRAME
Definition: frame.h:255
frame_info
Definition: frame.c:85
defs.h
arch-utils.h
SIGCONTEXT_OFFSET
#define SIGCONTEXT_OFFSET
Definition: bfin-linux-tdep.c:34
bfin_linux_sigframe
static const struct tramp_frame bfin_linux_sigframe
Definition: bfin-linux-tdep.c:117
trad-frame.h
osabi.h
trad_frame_cache
Definition: trad-frame.c:27
regcache.h
ptid_t
Definition: ptid.h:35
bfin_linux_get_syscall_number
static LONGEST bfin_linux_get_syscall_number(struct gdbarch *gdbarch, ptid_t ptid)
Definition: bfin-linux-tdep.c:130
gdbarch_byte_order
enum bfd_endian gdbarch_byte_order(struct gdbarch *gdbarch)
Definition: gdbarch.c:1509
bfin_linux_sigframe_init
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)
Definition: bfin-linux-tdep.c:97
set_xml_syscall_file_name
void set_xml_syscall_file_name(struct gdbarch *gdbarch, const char *name)
Definition: xml-syscall.c:513
xml-syscall.h
gdbarch_register_osabi
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:143
tramp-frame.h
gdb_byte
bfd_byte gdb_byte
Definition: common-types.h:38
set_gdbarch_get_syscall_number
void set_gdbarch_get_syscall_number(struct gdbarch *gdbarch, gdbarch_get_syscall_number_ftype get_syscall_number)
Definition: gdbarch.c:4281
tramp_frame_prepend_unwinder
void tramp_frame_prepend_unwinder(struct gdbarch *gdbarch, const struct tramp_frame *tramp_frame)
Definition: tramp-frame.c:146
regcache_cooked_read
enum register_status regcache_cooked_read(struct regcache *regcache, int regnum, gdb_byte *buf)
Definition: regcache.c:661
linux-tdep.h
extract_signed_integer
static LONGEST extract_signed_integer(const gdb_byte *addr, int len, enum bfd_endian byte_order)
Definition: defs.h:570
regcache
Definition: regcache.h:232
gdbarch_info
Definition: gdbarch.h:1626
bfin_linux_init_abi
static void bfin_linux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition: bfin-linux-tdep.c:151
tramp_frame
Definition: tramp-frame.h:46
regcache::ptid
ptid_t ptid() const
Definition: regcache.h:325
_initialize_bfin_linux_tdep
void _initialize_bfin_linux_tdep(void)
Definition: bfin-linux-tdep.c:165
bfin_linux_sigcontext_reg_offset
static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS]
Definition: bfin-linux-tdep.c:36
bfin-tdep.h
LONGEST
long long LONGEST
Definition: common-types.h:52