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eb826dc6 MF |
1 | /* GNU/Linux/BFIN specific low level interface, for the remote server for GDB. |
2 | ||
7b6bb8da | 3 | Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
eb826dc6 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 "server.h" | |
24 | #include "linux-low.h" | |
25 | #include "libiberty.h" | |
26 | #include <asm/ptrace.h> | |
27 | ||
28 | /* Defined in auto-generated file reg-bfin.c. */ | |
29 | void init_registers_bfin (void); | |
30 | ||
31 | static int bfin_regmap[] = | |
32 | { | |
33 | PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7, | |
34 | PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP, | |
35 | PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3, | |
36 | PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3, | |
37 | PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS, | |
38 | PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1, | |
39 | -1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */, | |
40 | -1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE, | |
41 | PT_PC, | |
42 | }; | |
43 | ||
44 | #define bfin_num_regs ARRAY_SIZE (bfin_regmap) | |
45 | ||
46 | static int | |
47 | bfin_cannot_store_register (int regno) | |
48 | { | |
49 | return (regno >= bfin_num_regs); | |
50 | } | |
51 | ||
52 | static int | |
53 | bfin_cannot_fetch_register (int regno) | |
54 | { | |
55 | return (regno >= bfin_num_regs); | |
56 | } | |
57 | ||
58 | static CORE_ADDR | |
59 | bfin_get_pc (struct regcache *regcache) | |
60 | { | |
61 | unsigned long pc; | |
62 | ||
63 | collect_register_by_name (regcache, "pc", &pc); | |
64 | ||
65 | return pc; | |
66 | } | |
67 | ||
68 | static void | |
69 | bfin_set_pc (struct regcache *regcache, CORE_ADDR pc) | |
70 | { | |
71 | unsigned long newpc = pc; | |
72 | ||
73 | supply_register_by_name (regcache, "pc", &newpc); | |
74 | } | |
75 | ||
76 | #define bfin_breakpoint_len 2 | |
77 | static const unsigned char bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00}; | |
78 | ||
79 | static int | |
80 | bfin_breakpoint_at (CORE_ADDR where) | |
81 | { | |
82 | unsigned char insn[bfin_breakpoint_len]; | |
83 | ||
84 | read_inferior_memory(where, insn, bfin_breakpoint_len); | |
85 | if (insn[0] == bfin_breakpoint[0] | |
86 | && insn[1] == bfin_breakpoint[1]) | |
87 | return 1; | |
88 | ||
89 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
90 | one. */ | |
91 | return 0; | |
92 | } | |
93 | ||
94 | struct linux_target_ops the_low_target = { | |
95 | init_registers_bfin, | |
96 | bfin_num_regs, | |
97 | bfin_regmap, | |
98 | bfin_cannot_fetch_register, | |
99 | bfin_cannot_store_register, | |
100 | bfin_get_pc, | |
101 | bfin_set_pc, | |
102 | bfin_breakpoint, | |
103 | bfin_breakpoint_len, | |
104 | 0, | |
105 | 2, | |
106 | bfin_breakpoint_at, | |
107 | }; |