1 /*
2 * Copyright (c) 2010-2014 Wind River Systems, Inc.
3 * Copyright (c) 2020 Intel Corporation
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 */
7
8
9 #include <zephyr/kernel.h>
10 #include <kernel_internal.h>
11 #include <zephyr/linker/linker-defs.h>
12
13 #ifdef CONFIG_REQUIRES_STACK_CANARIES
14 #ifdef CONFIG_STACK_CANARIES_TLS
15 extern Z_THREAD_LOCAL volatile uintptr_t __stack_chk_guard;
16 #else
17 extern volatile uintptr_t __stack_chk_guard;
18 #endif /* CONFIG_STACK_CANARIES_TLS */
19 #endif /* CONFIG_REQUIRES_STACK_CANARIES */
20
21 /**
22 * @brief Copy the data section from ROM to RAM
23 *
24 * This routine copies the data section from ROM to RAM.
25 */
z_data_copy(void)26 void z_data_copy(void)
27 {
28 z_early_memcpy(&__data_region_start, &__data_region_load_start,
29 __data_region_end - __data_region_start);
30 #ifdef CONFIG_ARCH_HAS_RAMFUNC_SUPPORT
31 z_early_memcpy(&__ramfunc_region_start, &__ramfunc_load_start,
32 __ramfunc_end - __ramfunc_region_start);
33 #endif /* CONFIG_ARCH_HAS_RAMFUNC_SUPPORT */
34 #ifdef CONFIG_ARCH_HAS_NOCACHE_MEMORY_SUPPORT
35 #if CONFIG_NOCACHE_MEMORY
36 z_early_memcpy(&_nocache_ram_start, &_nocache_load_start,
37 (uintptr_t) &_nocache_ram_size);
38 #endif /* CONFIG_NOCACHE_MEMORY */
39 #endif /* CONFIG_ARCH_HAS_NOCACHE_MEMORY_SUPPORT */
40 #if DT_NODE_HAS_STATUS_OKAY(DT_CHOSEN(zephyr_ccm))
41 z_early_memcpy(&__ccm_data_start, &__ccm_data_load_start,
42 __ccm_data_end - __ccm_data_start);
43 #endif
44 #if DT_NODE_HAS_STATUS_OKAY(DT_CHOSEN(zephyr_itcm))
45 z_early_memcpy(&__itcm_start, &__itcm_load_start,
46 (uintptr_t) &__itcm_size);
47 #endif
48 #if DT_NODE_HAS_STATUS_OKAY(DT_CHOSEN(zephyr_dtcm))
49 z_early_memcpy(&__dtcm_data_start, &__dtcm_data_load_start,
50 __dtcm_data_end - __dtcm_data_start);
51 #endif
52 #ifdef CONFIG_CODE_DATA_RELOCATION
53 extern void data_copy_xip_relocation(void);
54
55 data_copy_xip_relocation();
56 #endif /* CONFIG_CODE_DATA_RELOCATION */
57 #ifdef CONFIG_USERSPACE
58 #ifdef CONFIG_REQUIRES_STACK_CANARIES
59 /* stack canary checking is active for all C functions.
60 * __stack_chk_guard is some uninitialized value living in the
61 * app shared memory sections. Preserve it, and don't make any
62 * function calls to perform the memory copy. The true canary
63 * value gets set later in z_cstart().
64 */
65 uintptr_t guard_copy = __stack_chk_guard;
66 uint8_t *src = (uint8_t *)&_app_smem_rom_start;
67 uint8_t *dst = (uint8_t *)&_app_smem_start;
68 uint32_t count = _app_smem_end - _app_smem_start;
69
70 guard_copy = __stack_chk_guard;
71 while (count > 0) {
72 *(dst++) = *(src++);
73 count--;
74 }
75 __stack_chk_guard = guard_copy;
76 #else
77 z_early_memcpy(&_app_smem_start, &_app_smem_rom_start,
78 _app_smem_end - _app_smem_start);
79 #endif /* CONFIG_REQUIRES_STACK_CANARIES */
80 #endif /* CONFIG_USERSPACE */
81 }
82