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1 | /* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB. |
2 | Copyright 2007, 2008 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | ||
20 | #include "server.h" | |
21 | #include "linux-low.h" | |
22 | ||
23 | #include <sys/ptrace.h> | |
24 | #include <xtensa-config.h> | |
25 | ||
26 | #include "xtensa-xtregs.c" | |
27 | ||
28 | enum regnum { | |
29 | R_PC=0, R_PS, | |
30 | R_LBEG, R_LEND, R_LCOUNT, | |
31 | R_SAR, | |
32 | R_WS, R_WB, | |
33 | R_A0 = 64 | |
34 | }; | |
35 | ||
36 | static void | |
37 | xtensa_fill_gregset (void *buf) | |
38 | { | |
39 | elf_greg_t* rset = (elf_greg_t*)buf; | |
40 | int ar0_regnum; | |
41 | char *ptr; | |
42 | int i; | |
43 | ||
44 | /* Take care of AR registers. */ | |
45 | ||
46 | ar0_regnum = find_regno ("ar0"); | |
47 | ptr = (char*)&rset[R_A0]; | |
48 | ||
49 | for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++) | |
50 | { | |
51 | collect_register (i, ptr); | |
52 | ptr += register_size(i); | |
53 | } | |
54 | ||
55 | /* Loop registers, if hardware has it. */ | |
56 | ||
57 | #if XCHAL_HAVE_LOOP | |
58 | collect_register_by_name ("lbeg", (char*)&rset[R_LBEG]); | |
59 | collect_register_by_name ("lend", (char*)&rset[R_LEND]); | |
60 | collect_register_by_name ("lcount", (char*)&rset[R_LCOUNT]); | |
61 | #endif | |
62 | ||
63 | collect_register_by_name ("sar", (char*)&rset[R_SAR]); | |
64 | collect_register_by_name ("pc", (char*)&rset[R_PC]); | |
65 | collect_register_by_name ("ps", (char*)&rset[R_PS]); | |
66 | collect_register_by_name ("windowbase", (char*)&rset[R_WB]); | |
67 | collect_register_by_name ("windowstart", (char*)&rset[R_WS]); | |
68 | } | |
69 | ||
70 | static void | |
71 | xtensa_store_gregset (const void *buf) | |
72 | { | |
73 | const elf_greg_t* rset = (const elf_greg_t*)buf; | |
74 | int ar0_regnum; | |
75 | char *ptr; | |
76 | int i; | |
77 | ||
78 | /* Take care of AR registers. */ | |
79 | ||
80 | ar0_regnum = find_regno ("ar0"); | |
81 | ptr = (char *)&rset[R_A0]; | |
82 | ||
83 | for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++) | |
84 | { | |
85 | supply_register (i, ptr); | |
86 | ptr += register_size(i); | |
87 | } | |
88 | ||
89 | /* Loop registers, if hardware has it. */ | |
90 | ||
91 | #if XCHAL_HAVE_LOOP | |
92 | supply_register_by_name ("lbeg", (char*)&rset[R_LBEG]); | |
93 | supply_register_by_name ("lend", (char*)&rset[R_LEND]); | |
94 | supply_register_by_name ("lcount", (char*)&rset[R_LCOUNT]); | |
95 | #endif | |
96 | ||
97 | supply_register_by_name ("sar", (char*)&rset[R_SAR]); | |
98 | supply_register_by_name ("pc", (char*)&rset[R_PC]); | |
99 | supply_register_by_name ("ps", (char*)&rset[R_PS]); | |
100 | supply_register_by_name ("windowbase", (char*)&rset[R_WB]); | |
101 | supply_register_by_name ("windowstart", (char*)&rset[R_WS]); | |
102 | } | |
103 | ||
104 | /* Xtensa GNU/Linux PTRACE interface includes extended register set. */ | |
105 | ||
106 | static void | |
107 | xtensa_fill_xtregset (void *buf) | |
108 | { | |
109 | const xtensa_regtable_t *ptr; | |
110 | ||
111 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) | |
112 | { | |
113 | collect_register_by_name (ptr->name, | |
114 | (char*)buf + ptr->ptrace_offset); | |
115 | } | |
116 | } | |
117 | ||
118 | static void | |
119 | xtensa_store_xtregset (const void *buf) | |
120 | { | |
121 | const xtensa_regtable_t *ptr; | |
122 | ||
123 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) | |
124 | { | |
125 | supply_register_by_name (ptr->name, | |
126 | (char*)buf + ptr->ptrace_offset); | |
127 | } | |
128 | } | |
129 | ||
130 | struct regset_info target_regsets[] = { | |
131 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), | |
132 | GENERAL_REGS, | |
133 | xtensa_fill_gregset, xtensa_store_gregset }, | |
134 | { PTRACE_GETXTREGS, PTRACE_SETXTREGS, XTENSA_ELF_XTREG_SIZE, | |
135 | EXTENDED_REGS, | |
136 | xtensa_fill_xtregset, xtensa_store_xtregset }, | |
137 | { 0, 0, -1, -1, NULL, NULL } | |
138 | }; | |
139 | ||
140 | #if XCHAL_HAVE_BE | |
141 | #define XTENSA_BREAKPOINT {0xd2,0x0f} | |
142 | #else | |
143 | #define XTENSA_BREAKPOINT {0x2d,0xf0} | |
144 | #endif | |
145 | ||
146 | static const unsigned char xtensa_breakpoint[] = XTENSA_BREAKPOINT; | |
147 | #define xtensa_breakpoint_len 2 | |
148 | ||
149 | static CORE_ADDR | |
150 | xtensa_get_pc (void) | |
151 | { | |
152 | unsigned long pc; | |
153 | ||
154 | collect_register_by_name ("pc", &pc); | |
155 | return pc; | |
156 | } | |
157 | ||
158 | static void | |
159 | xtensa_set_pc (CORE_ADDR pc) | |
160 | { | |
161 | unsigned long newpc = pc; | |
162 | supply_register_by_name ("pc", &newpc); | |
163 | } | |
164 | ||
165 | static int | |
166 | xtensa_breakpoint_at (CORE_ADDR where) | |
167 | { | |
168 | unsigned long insn; | |
169 | ||
170 | (*the_target->read_memory) (where, (unsigned char *) &insn, | |
171 | xtensa_breakpoint_len); | |
172 | return memcmp((char *)&insn, xtensa_breakpoint, xtensa_breakpoint_len) == 0; | |
173 | } | |
174 | ||
175 | struct linux_target_ops the_low_target = { | |
176 | 0, | |
177 | 0, | |
178 | 0, | |
179 | 0, | |
180 | xtensa_get_pc, | |
181 | xtensa_set_pc, | |
182 | xtensa_breakpoint, | |
183 | xtensa_breakpoint_len, | |
184 | NULL, | |
185 | 0, | |
186 | xtensa_breakpoint_at, | |
187 | }; |