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12b35405 MR |
1 | /* |
2 | * QEMU AVR gdbstub | |
3 | * | |
4 | * Copyright (c) 2016-2020 Michael Rolnik | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library 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 GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, see | |
18 | * <http://www.gnu.org/licenses/lgpl-2.1.html> | |
19 | */ | |
20 | ||
21 | #include "qemu/osdep.h" | |
22 | #include "exec/gdbstub.h" | |
23 | ||
24 | int avr_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n) | |
25 | { | |
26 | AVRCPU *cpu = AVR_CPU(cs); | |
27 | CPUAVRState *env = &cpu->env; | |
28 | ||
29 | /* R */ | |
30 | if (n < 32) { | |
31 | return gdb_get_reg8(mem_buf, env->r[n]); | |
32 | } | |
33 | ||
34 | /* SREG */ | |
35 | if (n == 32) { | |
36 | uint8_t sreg = cpu_get_sreg(env); | |
37 | ||
38 | return gdb_get_reg8(mem_buf, sreg); | |
39 | } | |
40 | ||
41 | /* SP */ | |
42 | if (n == 33) { | |
43 | return gdb_get_reg16(mem_buf, env->sp & 0x0000ffff); | |
44 | } | |
45 | ||
46 | /* PC */ | |
47 | if (n == 34) { | |
48 | return gdb_get_reg32(mem_buf, env->pc_w * 2); | |
49 | } | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | int avr_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) | |
55 | { | |
56 | AVRCPU *cpu = AVR_CPU(cs); | |
57 | CPUAVRState *env = &cpu->env; | |
58 | ||
59 | /* R */ | |
60 | if (n < 32) { | |
61 | env->r[n] = *mem_buf; | |
62 | return 1; | |
63 | } | |
64 | ||
65 | /* SREG */ | |
66 | if (n == 32) { | |
67 | cpu_set_sreg(env, *mem_buf); | |
68 | return 1; | |
69 | } | |
70 | ||
71 | /* SP */ | |
72 | if (n == 33) { | |
73 | env->sp = lduw_p(mem_buf); | |
74 | return 2; | |
75 | } | |
76 | ||
77 | /* PC */ | |
78 | if (n == 34) { | |
79 | env->pc_w = ldl_p(mem_buf) / 2; | |
80 | return 4; | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
e64cb6c2 RH |
85 | |
86 | vaddr avr_cpu_gdb_adjust_breakpoint(CPUState *cpu, vaddr addr) | |
87 | { | |
88 | /* | |
89 | * This is due to some strange GDB behavior | |
90 | * Let's assume main has address 0x100: | |
91 | * b main - sets breakpoint at address 0x00000100 (code) | |
92 | * b *0x100 - sets breakpoint at address 0x00800100 (data) | |
93 | * | |
94 | * Force all breakpoints into code space. | |
95 | */ | |
96 | return addr % OFFSET_DATA; | |
97 | } |