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eb826dc6 MF |
1 | /* GNU/Linux/BFIN specific low level interface, for the remote server for GDB. |
2 | ||
32d0add0 | 3 | Copyright (C) 2005-2015 Free Software Foundation, Inc. |
eb826dc6 MF |
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 "server.h" | |
23 | #include "linux-low.h" | |
eb826dc6 MF |
24 | #include <asm/ptrace.h> |
25 | ||
26 | /* Defined in auto-generated file reg-bfin.c. */ | |
27 | void init_registers_bfin (void); | |
3aee8918 | 28 | extern const struct target_desc *tdesc_bfin; |
eb826dc6 MF |
29 | |
30 | static int bfin_regmap[] = | |
31 | { | |
32 | PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7, | |
33 | PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP, | |
34 | PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3, | |
35 | PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3, | |
36 | PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS, | |
37 | PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1, | |
38 | -1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */, | |
39 | -1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE, | |
40 | PT_PC, | |
41 | }; | |
42 | ||
43 | #define bfin_num_regs ARRAY_SIZE (bfin_regmap) | |
44 | ||
45 | static int | |
46 | bfin_cannot_store_register (int regno) | |
47 | { | |
48 | return (regno >= bfin_num_regs); | |
49 | } | |
50 | ||
51 | static int | |
52 | bfin_cannot_fetch_register (int regno) | |
53 | { | |
54 | return (regno >= bfin_num_regs); | |
55 | } | |
56 | ||
57 | static CORE_ADDR | |
58 | bfin_get_pc (struct regcache *regcache) | |
59 | { | |
60 | unsigned long pc; | |
61 | ||
62 | collect_register_by_name (regcache, "pc", &pc); | |
63 | ||
64 | return pc; | |
65 | } | |
66 | ||
67 | static void | |
68 | bfin_set_pc (struct regcache *regcache, CORE_ADDR pc) | |
69 | { | |
70 | unsigned long newpc = pc; | |
71 | ||
72 | supply_register_by_name (regcache, "pc", &newpc); | |
73 | } | |
74 | ||
75 | #define bfin_breakpoint_len 2 | |
dd373349 AT |
76 | static const gdb_byte bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00}; |
77 | ||
78 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ | |
79 | ||
80 | static const gdb_byte * | |
81 | bfin_sw_breakpoint_from_kind (int kind, int *size) | |
82 | { | |
83 | *size = bfin_breakpoint_len; | |
84 | return bfin_breakpoint; | |
85 | } | |
eb826dc6 MF |
86 | |
87 | static int | |
88 | bfin_breakpoint_at (CORE_ADDR where) | |
89 | { | |
90 | unsigned char insn[bfin_breakpoint_len]; | |
91 | ||
92 | read_inferior_memory(where, insn, bfin_breakpoint_len); | |
93 | if (insn[0] == bfin_breakpoint[0] | |
94 | && insn[1] == bfin_breakpoint[1]) | |
95 | return 1; | |
96 | ||
97 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
98 | one. */ | |
99 | return 0; | |
100 | } | |
101 | ||
3aee8918 PA |
102 | static void |
103 | bfin_arch_setup (void) | |
104 | { | |
105 | current_process ()->tdesc = tdesc_bfin; | |
106 | } | |
107 | ||
108 | static struct usrregs_info bfin_usrregs_info = | |
109 | { | |
110 | bfin_num_regs, | |
111 | bfin_regmap, | |
112 | }; | |
113 | ||
114 | static struct regs_info regs_info = | |
115 | { | |
116 | NULL, /* regset_bitmap */ | |
117 | &bfin_usrregs_info, | |
118 | }; | |
119 | ||
120 | static const struct regs_info * | |
121 | bfin_regs_info (void) | |
122 | { | |
123 | return ®s_info; | |
124 | } | |
125 | ||
eb826dc6 | 126 | struct linux_target_ops the_low_target = { |
3aee8918 PA |
127 | bfin_arch_setup, |
128 | bfin_regs_info, | |
eb826dc6 MF |
129 | bfin_cannot_fetch_register, |
130 | bfin_cannot_store_register, | |
c14dfd32 | 131 | NULL, /* fetch_register */ |
eb826dc6 MF |
132 | bfin_get_pc, |
133 | bfin_set_pc, | |
dd373349 AT |
134 | NULL, /* breakpoint_kind_from_pc */ |
135 | bfin_sw_breakpoint_from_kind, | |
4f3cee1c | 136 | NULL, /* breakpoint_reinsert_addr */ |
eb826dc6 MF |
137 | 2, |
138 | bfin_breakpoint_at, | |
139 | }; | |
3aee8918 PA |
140 | |
141 | ||
142 | void | |
143 | initialize_low_arch (void) | |
144 | { | |
145 | init_registers_bfin (); | |
146 | } |