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ae159ef4 | 1 | /* Copyright 2013 Adam Green (http://mbed.org/users/AdamGreen/) |
60c34c05 | 2 | |
ae159ef4 AG |
3 | Licensed under the Apache License, Version 2.0 (the "License"); |
4 | you may not use this file except in compliance with the License. | |
5 | You may obtain a copy of the License at | |
60c34c05 | 6 | |
ae159ef4 | 7 | http://www.apache.org/licenses/LICENSE-2.0 |
60c34c05 | 8 | |
ae159ef4 AG |
9 | Unless required by applicable law or agreed to in writing, software |
10 | distributed under the License is distributed on an "AS IS" BASIS, | |
11 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | See the License for the specific language governing permissions and | |
13 | limitations under the License. | |
60c34c05 AG |
14 | */ |
15 | /* Provide routines which hook the MRI debug monitor into GCC4MBED projects. */ | |
16 | #include <string.h> | |
17 | #include <sys/types.h> | |
18 | #include <errno.h> | |
19 | #include <mri.h> | |
20 | #include <cmsis.h> | |
65eee97a AG |
21 | #include "mpu.h" |
22 | ||
23 | static void configureHighestMpuRegionToAccessAllMemoryWithNoCaching(void); | |
60c34c05 AG |
24 | |
25 | extern unsigned int __bss_start__; | |
26 | extern unsigned int __bss_end__; | |
27 | extern "C" int main(void); | |
28 | extern "C" void __libc_init_array(void); | |
29 | extern "C" void exit(int ErrorCode); | |
30 | extern "C" void _start(void) | |
31 | { | |
32 | int bssSize = (int)&__bss_end__ - (int)&__bss_start__; | |
33 | int mainReturnValue; | |
34 | ||
35 | memset(&__bss_start__, 0, bssSize); | |
36 | ||
65eee97a AG |
37 | if (WRITE_BUFFER_DISABLE) |
38 | { | |
39 | disableMPU(); | |
40 | configureHighestMpuRegionToAccessAllMemoryWithNoCaching(); | |
41 | enableMPU(); | |
42 | } | |
60c34c05 AG |
43 | if (MRI_ENABLE) |
44 | { | |
45 | __mriInit(MRI_INIT_PARAMETERS); | |
46 | if (MRI_BREAK_ON_INIT) | |
47 | __debugbreak(); | |
48 | } | |
49 | ||
50 | __libc_init_array(); | |
51 | mainReturnValue = main(); | |
52 | exit(mainReturnValue); | |
53 | } | |
54 | ||
65eee97a AG |
55 | static void configureHighestMpuRegionToAccessAllMemoryWithNoCaching(void) |
56 | { | |
57 | static const uint32_t regionToStartAtAddress0 = 0U; | |
58 | static const uint32_t regionReadWrite = 1 << MPU_RASR_AP_SHIFT; | |
59 | static const uint32_t regionSizeAt4GB = 31 << MPU_RASR_SIZE_SHIFT; /* 4GB = 2^(31+1) */ | |
60 | static const uint32_t regionEnable = MPU_RASR_ENABLE; | |
61 | static const uint32_t regionSizeAndAttributes = regionReadWrite | regionSizeAt4GB | regionEnable; | |
62 | ||
63 | prepareToAccessMPURegion(getHighestMPUDataRegionIndex()); | |
64 | setMPURegionAddress(regionToStartAtAddress0); | |
65 | setMPURegionAttributeAndSize(regionSizeAndAttributes); | |
66 | } | |
67 | ||
68 | ||
60c34c05 AG |
69 | |
70 | extern "C" int __real__read(int file, char *ptr, int len); | |
71 | extern "C" int __wrap__read(int file, char *ptr, int len) | |
72 | { | |
73 | if (MRI_SEMIHOST_STDIO && file < 3) | |
74 | return __mriNewlib_SemihostRead(file, ptr, len); | |
75 | return __real__read(file, ptr, len); | |
76 | } | |
77 | ||
78 | ||
79 | extern "C" int __real__write(int file, char *ptr, int len); | |
80 | extern "C" int __wrap__write(int file, char *ptr, int len) | |
81 | { | |
82 | if (MRI_SEMIHOST_STDIO && file < 3) | |
83 | return __mriNewlib_SemihostWrite(file, ptr, len); | |
84 | return __real__write(file, ptr, len); | |
85 | } | |
86 | ||
87 | ||
88 | extern "C" int __real__isatty(int file); | |
89 | extern "C" int __wrap__isatty(int file) | |
90 | { | |
91 | /* Hardcoding the stdin/stdout/stderr handles to be interactive tty devices, unlike mbed.ar */ | |
92 | if (file < 3) | |
93 | return 1; | |
94 | return __real__isatty(file); | |
95 | } | |
96 | ||
97 | ||
98 | extern "C" int __wrap_semihost_connected(void) | |
99 | { | |
100 | /* MRI makes it look like there is no mbed interface attached since it disables the JTAG portion but MRI does | |
101 | support some of the mbed semihost calls when it is running so force it to return -1, indicating that the | |
102 | interface is attached. */ | |
103 | return -1; | |
104 | } | |
105 | ||
106 | ||
107 | ||
108 | extern "C" void abort(void) | |
109 | { | |
110 | if (MRI_ENABLE) | |
111 | __debugbreak(); | |
112 | ||
113 | exit(1); | |
114 | } | |
115 | ||
116 | ||
117 | extern "C" void __cxa_pure_virtual(void) | |
118 | { | |
119 | abort(); | |
120 | } | |
121 | ||
122 | ||
123 | extern "C" int __aeabi_unwind_cpp_pr0(int state, void* controlBlock, void* context) | |
124 | { | |
125 | abort(); | |
126 | } | |
127 | ||
128 | ||
129 | extern "C" int __aeabi_unwind_cpp_pr1(int state, void* controlBlock, void* context) | |
130 | { | |
131 | abort(); | |
132 | } | |
133 | ||
134 | ||
135 | extern "C" int __aeabi_unwind_cpp_pr2(int state, void* controlBlock, void* context) | |
136 | { | |
137 | abort(); | |
138 | } | |
139 | ||
140 | /* Trap calls to malloc/free/realloc in ISR. */ | |
141 | extern "C" void __malloc_lock(void) | |
142 | { | |
143 | if (__get_IPSR() != 0) | |
144 | __debugbreak(); | |
145 | } | |
146 | ||
147 | extern "C" void __malloc_unlock(void) | |
148 | { | |
149 | } | |
150 | ||
151 | ||
152 | /* Linker defined symbol to be used by sbrk for where dynamically heap should start. */ | |
153 | extern "C" unsigned int __HeapBase; | |
154 | ||
155 | /* Turn off the errno macro and use actual external global variable instead. */ | |
156 | #undef errno | |
157 | extern int errno; | |
158 | ||
159 | /* Dynamic memory allocation related syscalls. */ | |
160 | extern "C" caddr_t _sbrk(int incr) | |
161 | { | |
162 | static unsigned char* heap = (unsigned char*)&__HeapBase; | |
163 | unsigned char* prev_heap = heap; | |
164 | unsigned char* new_heap = heap + incr; | |
165 | ||
166 | if (new_heap >= (unsigned char*)__get_MSP()) { | |
167 | errno = ENOMEM; | |
168 | return (caddr_t)-1; | |
169 | } | |
170 | ||
171 | heap = new_heap; | |
172 | return (caddr_t) prev_heap; | |
173 | } | |
174 | ||
175 | ||
176 | /* Optional functionality which will tag each heap allocation with the caller's return address. */ | |
b3e1627c | 177 | #ifdef HEAP_TAGS |
60c34c05 AG |
178 | |
179 | const unsigned int* __smoothieHeapBase = &__HeapBase; | |
180 | ||
181 | extern "C" void* __real_malloc(size_t size); | |
182 | extern "C" void* __real_realloc(void* ptr, size_t size); | |
b3e1627c | 183 | extern "C" void __real_free(void* ptr); |
60c34c05 AG |
184 | |
185 | static void setTag(void* pv, unsigned int tag); | |
186 | static unsigned int* footerForChunk(void* pv); | |
187 | static unsigned int* headerForChunk(void* pv); | |
188 | static unsigned int sizeOfChunk(unsigned int* pHeader); | |
b3e1627c | 189 | static int isChunkInUse(void* pv); |
60c34c05 AG |
190 | |
191 | extern "C" __attribute__((naked)) void __wrap_malloc(size_t size) | |
192 | { | |
193 | __asm ( | |
194 | ".syntax unified\n" | |
195 | ".thumb\n" | |
196 | "mov r1,lr\n" | |
197 | "b mallocWithTag\n" | |
198 | ); | |
199 | } | |
200 | ||
201 | extern "C" void* mallocWithTag(size_t size, unsigned int tag) | |
202 | { | |
203 | void* p = __real_malloc(size + sizeof(tag)); | |
204 | if (!p && __smoothieHeapBase) | |
205 | return p; | |
206 | setTag(p, tag); | |
207 | return p; | |
208 | } | |
209 | ||
210 | static void setTag(void* pv, unsigned int tag) | |
211 | { | |
212 | unsigned int* pFooter = footerForChunk(pv); | |
213 | *pFooter = tag; | |
214 | } | |
215 | ||
216 | static unsigned int* footerForChunk(void* pv) | |
217 | { | |
218 | unsigned int* pHeader = headerForChunk(pv); | |
219 | unsigned int size = sizeOfChunk(pHeader); | |
220 | return (unsigned int*)(void*)((char*)pHeader + size); | |
221 | } | |
222 | ||
223 | static unsigned int* headerForChunk(void* pv) | |
224 | { | |
225 | // Header is allocated two words (8 bytes) before the publicly returned allocation chunk address. | |
226 | unsigned int* p = (unsigned int*)pv; | |
227 | return &p[-2]; | |
228 | } | |
229 | ||
230 | static unsigned int sizeOfChunk(unsigned int* pHeader) | |
231 | { | |
232 | /* Remove previous chunk in use flag. */ | |
233 | return pHeader[1] & ~1; | |
234 | } | |
235 | ||
236 | extern "C" __attribute__((naked)) void __wrap_realloc(void* ptr, size_t size) | |
237 | { | |
238 | __asm ( | |
239 | ".syntax unified\n" | |
240 | ".thumb\n" | |
241 | "mov r2,lr\n" | |
242 | "b reallocWithTag\n" | |
243 | ); | |
244 | } | |
245 | ||
246 | extern "C" void* reallocWithTag(void* ptr, size_t size, unsigned int tag) | |
247 | { | |
248 | void* p = __real_realloc(ptr, size + sizeof(tag)); | |
249 | if (!p) | |
250 | return p; | |
251 | setTag(p, tag); | |
252 | return p; | |
253 | } | |
254 | ||
b3e1627c AG |
255 | extern "C" void __wrap_free(void* ptr) |
256 | { | |
257 | if (!isChunkInUse(ptr)) | |
258 | __debugbreak(); | |
259 | __real_free(ptr); | |
260 | } | |
261 | ||
262 | static int isChunkInUse(void* pv) | |
263 | { | |
264 | unsigned int* pFooter = footerForChunk(pv); | |
265 | return pFooter[1] & 1; | |
266 | } | |
267 | ||
60c34c05 AG |
268 | __attribute__((naked)) void* operator new(size_t size) |
269 | { | |
270 | __asm ( | |
271 | ".syntax unified\n" | |
272 | ".thumb\n" | |
273 | "push {r4,lr}\n" | |
274 | "mov r1,lr\n" | |
275 | "bl mallocWithTag\n" | |
276 | "cbnz r0, 1$\n" | |
277 | "bl abort\n" | |
278 | "1$:\n" | |
279 | "pop {r4,pc}\n" | |
280 | ); | |
b3e1627c AG |
281 | // This line never executes but silences no return value warning from compiler. |
282 | return (void*)1; | |
60c34c05 AG |
283 | } |
284 | ||
285 | #endif // HEAP_TAGS |