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https://github.com/espressif/esp-idf.git
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563bc5d19d
At -O2 optimization level, GCC seems to optimize out the copying of the first byte of the checksum, assuming it is zero. This "miscompilation" happens because the esp_app_desc struct is declared const, but then modified post-compilation. Casting to volatile disables the optimization. Closes: https://github.com/espressif/esp-idf/pull/6389
111 lines
3.7 KiB
C
111 lines
3.7 KiB
C
// Copyright 2017-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <assert.h>
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#include <sys/param.h>
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#include "esp_ota_ops.h"
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#include "esp_attr.h"
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#include "sdkconfig.h"
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// Application version info
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const __attribute__((section(".rodata_desc"))) esp_app_desc_t esp_app_desc = {
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.magic_word = ESP_APP_DESC_MAGIC_WORD,
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#ifdef CONFIG_APP_EXCLUDE_PROJECT_VER_VAR
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.version = "",
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#else
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.version = PROJECT_VER,
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#endif
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#ifdef CONFIG_APP_EXCLUDE_PROJECT_NAME_VAR
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.project_name = "",
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#else
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.project_name = PROJECT_NAME,
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#endif
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.idf_ver = IDF_VER,
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#ifdef CONFIG_BOOTLOADER_APP_SECURE_VERSION
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.secure_version = CONFIG_BOOTLOADER_APP_SECURE_VERSION,
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#else
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.secure_version = 0,
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#endif
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#ifdef CONFIG_APP_COMPILE_TIME_DATE
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.time = __TIME__,
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.date = __DATE__,
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#else
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.time = "",
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.date = "",
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#endif
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};
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#ifndef CONFIG_APP_EXCLUDE_PROJECT_VER_VAR
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_Static_assert(sizeof(PROJECT_VER) <= sizeof(esp_app_desc.version), "PROJECT_VER is longer than version field in structure");
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#endif
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_Static_assert(sizeof(IDF_VER) <= sizeof(esp_app_desc.idf_ver), "IDF_VER is longer than idf_ver field in structure");
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#ifndef CONFIG_APP_EXCLUDE_PROJECT_NAME_VAR
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_Static_assert(sizeof(PROJECT_NAME) <= sizeof(esp_app_desc.project_name), "PROJECT_NAME is longer than project_name field in structure");
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#endif
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const esp_app_desc_t *esp_ota_get_app_description(void)
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{
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return &esp_app_desc;
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}
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/* The following two functions may be called from the panic handler
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* or core dump, hence IRAM_ATTR.
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*/
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static inline char IRAM_ATTR to_hex_digit(unsigned val)
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{
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return (val < 10) ? ('0' + val) : ('a' + val - 10);
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}
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__attribute__((constructor)) void esp_ota_init_app_elf_sha256(void)
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{
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esp_ota_get_app_elf_sha256(NULL, 0);
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}
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/* The esp_app_desc.app_elf_sha256 should be possible to print in panic handler during cache is disabled.
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* But because the cache is disabled the reading esp_app_desc.app_elf_sha256 is not right and
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* can lead to a complete lock-up of the CPU.
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* For this reason we do a reading of esp_app_desc.app_elf_sha256 while start up in esp_ota_init_app_elf_sha256()
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* and keep it in the static s_app_elf_sha256 value.
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*/
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int IRAM_ATTR esp_ota_get_app_elf_sha256(char* dst, size_t size)
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{
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static char s_app_elf_sha256[CONFIG_APP_RETRIEVE_LEN_ELF_SHA / 2];
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static bool first_call = true;
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if (first_call) {
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first_call = false;
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// At -O2 optimization level, GCC optimizes out the copying of the first byte of the app_elf_sha256,
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// because it is zero at compile time, and only modified afterwards by esptool.
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// Casting to volatile disables the optimization.
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const volatile uint8_t* src = (const volatile uint8_t*)esp_app_desc.app_elf_sha256;
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for (size_t i = 0; i < sizeof(s_app_elf_sha256); ++i) {
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s_app_elf_sha256[i] = src[i];
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}
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}
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if (dst == NULL || size == 0) {
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return 0;
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}
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size_t n = MIN((size - 1) / 2, sizeof(s_app_elf_sha256));
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for (size_t i = 0; i < n; ++i) {
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dst[2*i] = to_hex_digit(s_app_elf_sha256[i] >> 4);
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dst[2*i + 1] = to_hex_digit(s_app_elf_sha256[i] & 0xf);
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}
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dst[2*n] = 0;
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return 2*n + 1;
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}
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