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91021223 MF |
1 | /* Target-dependent code for Analog Devices Blackfin processor, for GDB. |
2 | ||
7b6bb8da | 3 | Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
91021223 MF |
4 | Free Software Foundation, Inc. |
5 | ||
6 | Contributed by Analog Devices, Inc. | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 3 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "arch-utils.h" | |
25 | #include "regcache.h" | |
26 | #include "tramp-frame.h" | |
27 | #include "trad-frame.h" | |
28 | #include "osabi.h" | |
29 | #include "xml-syscall.h" | |
30 | #include "linux-tdep.h" | |
31 | #include "bfin-tdep.h" | |
32 | ||
33 | /* From <asm/sigcontext.h>. */ | |
34 | ||
35 | #define SIGCONTEXT_OFFSET 168 | |
36 | ||
37 | static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS] = | |
38 | { | |
39 | 0 * 4, /* %r0 */ | |
40 | 1 * 4, /* %r1 */ | |
41 | 2 * 4, /* %r2 */ | |
42 | 3 * 4, /* %r3 */ | |
43 | 4 * 4, /* %r4 */ | |
44 | 5 * 4, /* %r5 */ | |
45 | 6 * 4, /* %r6 */ | |
46 | 7 * 4, /* %r7 */ | |
47 | 8 * 4, /* %p0 */ | |
48 | 9 * 4, /* %p1 */ | |
49 | 10 * 4, /* %p2 */ | |
50 | 11 * 4, /* %p3 */ | |
51 | 12 * 4, /* %p4 */ | |
52 | 13 * 4, /* %p5 */ | |
53 | 14 * 4, /* %sp */ | |
54 | 23 * 4, /* %fp */ | |
55 | 24 * 4, /* %i0 */ | |
56 | 25 * 4, /* %i1 */ | |
57 | 26 * 4, /* %i2 */ | |
58 | 27 * 4, /* %i3 */ | |
59 | 28 * 4, /* %m0 */ | |
60 | 29 * 4, /* %m1 */ | |
61 | 30 * 4, /* %m2 */ | |
62 | 31 * 4, /* %m3 */ | |
63 | 36 * 4, /* %b0 */ | |
64 | 37 * 4, /* %b1 */ | |
65 | 38 * 4, /* %b2 */ | |
66 | 39 * 4, /* %b3 */ | |
67 | 32 * 4, /* %l0 */ | |
68 | 33 * 4, /* %l1 */ | |
69 | 34 * 4, /* %l2 */ | |
70 | 35 * 4, /* %l3 */ | |
71 | 17 * 4, /* %a0x */ | |
72 | 15 * 4, /* %a0w */ | |
73 | 18 * 4, /* %a1x */ | |
74 | 16 * 4, /* %a1w */ | |
75 | 19 * 4, /* %astat */ | |
76 | 20 * 4, /* %rets */ | |
77 | 40 * 4, /* %lc0 */ | |
78 | 42 * 4, /* %lt0 */ | |
79 | 44 * 4, /* %lb0 */ | |
80 | 41 * 4, /* %lc1 */ | |
81 | 43 * 4, /* %lt1 */ | |
82 | 45 * 4, /* %lb1 */ | |
83 | -1, /* %cycles */ | |
84 | -1, /* %cycles2 */ | |
85 | -1, /* %usp */ | |
86 | 46 * 4, /* %seqstat */ | |
87 | -1, /* syscfg */ | |
88 | 21 * 4, /* %reti */ | |
89 | 22 * 4, /* %retx */ | |
90 | -1, /* %retn */ | |
91 | -1, /* %rete */ | |
92 | 21 * 4, /* %pc */ | |
93 | }; | |
94 | ||
95 | /* Signal trampolines. */ | |
96 | ||
97 | static void | |
98 | bfin_linux_sigframe_init (const struct tramp_frame *self, | |
99 | struct frame_info *this_frame, | |
100 | struct trad_frame_cache *this_cache, | |
101 | CORE_ADDR func) | |
102 | { | |
103 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
104 | CORE_ADDR sp = get_frame_sp (this_frame); | |
105 | CORE_ADDR pc = get_frame_pc (this_frame); | |
106 | CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET; | |
107 | struct frame_id this_id; | |
108 | const int *reg_offset = bfin_linux_sigcontext_reg_offset; | |
109 | int i; | |
110 | ||
111 | for (i = 0; i < BFIN_NUM_REGS; i++) | |
112 | if (reg_offset[i] != -1) | |
113 | trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]); | |
114 | ||
115 | /* This would come after the LINK instruction in the ret_from_signal | |
116 | function, hence the frame id would be SP + 8. */ | |
117 | trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc)); | |
118 | } | |
119 | ||
120 | static const struct tramp_frame bfin_linux_sigframe = | |
121 | { | |
122 | SIGTRAMP_FRAME, | |
123 | 4, | |
124 | { | |
125 | { 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */ | |
126 | { 0x00A0, 0xffff }, /* EXCPT 0; */ | |
127 | { TRAMP_SENTINEL_INSN, -1 }, | |
128 | }, | |
129 | bfin_linux_sigframe_init, | |
130 | }; | |
131 | ||
132 | static LONGEST | |
133 | bfin_linux_get_syscall_number (struct gdbarch *gdbarch, | |
134 | ptid_t ptid) | |
135 | { | |
136 | struct regcache *regcache = get_thread_regcache (ptid); | |
137 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
138 | /* The content of a register. */ | |
139 | gdb_byte buf[4]; | |
140 | /* The result. */ | |
141 | LONGEST ret; | |
142 | ||
143 | /* Getting the system call number from the register. | |
144 | When dealing with Blackfin architecture, this information | |
145 | is stored at %p0 register. */ | |
146 | regcache_cooked_read (regcache, BFIN_P0_REGNUM, buf); | |
147 | ||
148 | ret = extract_signed_integer (buf, 4, byte_order); | |
149 | ||
150 | return ret; | |
151 | } | |
152 | ||
153 | static void | |
154 | bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
155 | { | |
156 | linux_init_abi (info, gdbarch); | |
157 | ||
158 | /* Set the sigtramp frame sniffer. */ | |
159 | tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe); | |
160 | ||
161 | /* Functions for 'catch syscall'. */ | |
162 | set_xml_syscall_file_name ("syscalls/bfin-linux.xml"); | |
163 | set_gdbarch_get_syscall_number (gdbarch, | |
164 | bfin_linux_get_syscall_number); | |
165 | } | |
166 | ||
167 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
168 | extern initialize_file_ftype _initialize_bfin_linux_tdep; | |
169 | ||
170 | void | |
171 | _initialize_bfin_linux_tdep (void) | |
172 | { | |
173 | gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX, | |
174 | bfin_linux_init_abi); | |
175 | } |