app_update: Moved app metadata to new component esp_app_format

components/esp_app_format/esp_app_desc.c

@@ -0,0 +1,103 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <assert.h>
+#include <sys/param.h>
+#include "esp_app_desc.h"
+#include "esp_attr.h"
+#include "sdkconfig.h"
+
+
+// Application version info
+const __attribute__((section(".rodata_desc"))) esp_app_desc_t esp_app_desc = {
+    .magic_word = ESP_APP_DESC_MAGIC_WORD,
+#ifdef CONFIG_APP_EXCLUDE_PROJECT_VER_VAR
+    .version = "",
+#else
+    .version = PROJECT_VER,
+#endif
+
+#ifdef CONFIG_APP_EXCLUDE_PROJECT_NAME_VAR
+    .project_name = "",
+#else
+    .project_name = PROJECT_NAME,
+#endif
+    .idf_ver = IDF_VER,
+
+#ifdef CONFIG_BOOTLOADER_APP_SECURE_VERSION
+    .secure_version = CONFIG_BOOTLOADER_APP_SECURE_VERSION,
+#else
+    .secure_version = 0,
+#endif
+
+#if defined(CONFIG_APP_COMPILE_TIME_DATE) && !defined(CONFIG_APP_REPRODUCIBLE_BUILD)
+    .time = __TIME__,
+    .date = __DATE__,
+#else
+    .time = "",
+    .date = "",
+#endif
+};
+
+
+#ifndef CONFIG_APP_EXCLUDE_PROJECT_VER_VAR
+_Static_assert(sizeof(PROJECT_VER) <= sizeof(esp_app_desc.version), "PROJECT_VER is longer than version field in structure");
+#endif
+_Static_assert(sizeof(IDF_VER) <= sizeof(esp_app_desc.idf_ver), "IDF_VER is longer than idf_ver field in structure");
+#ifndef CONFIG_APP_EXCLUDE_PROJECT_NAME_VAR
+_Static_assert(sizeof(PROJECT_NAME) <= sizeof(esp_app_desc.project_name), "PROJECT_NAME is longer than project_name field in structure");
+#endif
+
+const esp_app_desc_t *esp_app_get_description(void)
+{
+    return &esp_app_desc;
+}
+
+/* The following two functions may be called from the panic handler
+ * or core dump, hence IRAM_ATTR.
+ */
+
+static inline char IRAM_ATTR to_hex_digit(unsigned val)
+{
+    return (val < 10) ? ('0' + val) : ('a' + val - 10);
+}
+
+__attribute__((constructor)) void esp_init_app_elf_sha256(void)
+{
+    esp_app_get_elf_sha256(NULL, 0);
+}
+
+/* The esp_app_desc.app_elf_sha256 should be possible to print in panic handler during cache is disabled.
+ * But because the cache is disabled the reading esp_app_desc.app_elf_sha256 is not right and
+ * can lead to a complete lock-up of the CPU.
+ * For this reason we do a reading of esp_app_desc.app_elf_sha256 while start up in esp_init_app_elf_sha256()
+ * and keep it in the static s_app_elf_sha256 value.
+ */
+int IRAM_ATTR esp_app_get_elf_sha256(char* dst, size_t size)
+{
+    static char s_app_elf_sha256[CONFIG_APP_RETRIEVE_LEN_ELF_SHA / 2];
+    static bool first_call = true;
+    if (first_call) {
+        first_call = false;
+        // At -O2 optimization level, GCC optimizes out the copying of the first byte of the app_elf_sha256,
+        // because it is zero at compile time, and only modified afterwards by esptool.
+        // Casting to volatile disables the optimization.
+        const volatile uint8_t* src = (const volatile uint8_t*)esp_app_desc.app_elf_sha256;
+        for (size_t i = 0; i < sizeof(s_app_elf_sha256); ++i) {
+            s_app_elf_sha256[i] = src[i];
+        }
+    }
+    if (dst == NULL || size == 0) {
+        return 0;
+    }
+    size_t n = MIN((size - 1) / 2, sizeof(s_app_elf_sha256));
+    for (size_t i = 0; i < n; ++i) {
+        dst[2*i] = to_hex_digit(s_app_elf_sha256[i] >> 4);
+        dst[2*i + 1] = to_hex_digit(s_app_elf_sha256[i] & 0xf);
+    }
+    dst[2*n] = 0;
+    return 2*n + 1;
+}