os/kernel/crashlog_writer: Add crash log flash save

lib/libc/stdio/lib_lowoutstream.c

@@ -65,6 +65,9 @@
 
 #include "lib_internal.h"
 
+#ifdef CONFIG_LOWLOG_DUMP
+#include <tinyara/log_dump/lowlog_dump.h>
+#endif
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -76,6 +79,9 @@
 static void lowoutstream_putc(FAR struct lib_outstream_s *this, int ch)
 {
 	DEBUGASSERT(this);
+#if defined(__KERNEL__) && defined(CONFIG_LOWLOG_DUMP)
+	lowlog_dump_save_ch(ch);
+#endif
 #if defined(CONFIG_BUILD_FLAT) || (defined(CONFIG_BUILD_PROTECTED) && defined(__KERNEL__))
 	if (up_putc(ch) != EOF) {
 		this->nput++;

os/Kconfig

@@ -625,6 +625,10 @@ menu "Binary manager"
 source kernel/binary_manager/Kconfig
 endmenu
 
+menu "Lowlog dump"
+source kernel/log_dump/Kconfig
+endmenu
+
 menu "Task Monitor"
 source kernel/task_monitor/Kconfig
 endmenu

os/include/tinyara/log_dump/lowlog_dump.h

@@ -0,0 +1,66 @@
+/****************************************************************************
+ *
+ * Copyright 2025 Samsung Electronics All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __LOWLOG_DUMP_H__
+#define __LOWLOG_DUMP_H__
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+/*************************************************************************************
+* Description: 
+*   resume saving lldbg to buf.
+*
+*************************************************************************************/
+void lowlog_dump_resume(void);
+
+/*************************************************************************************
+* Description: 
+*   pause saving lldbg to buf.
+*
+*************************************************************************************/
+void lowlog_dump_pause(void);
+
+/****************************************************************************
+ * Description:
+ *   This is used to store logs that are output via lldbg() during a user crash situation into a buffer.
+ *
+ ****************************************************************************/
+void lowlog_dump_save_ch(char ch);
+
+/****************************************************************************
+ * Description: 
+ *   Saves the crash log to a file. 
+ *
+ ****************************************************************************/
+int lowlog_dump_save();
+
+/*************************************************************************************
+* Description: 
+* 	Reads a log from a file and stores it in a buffer. If the log is compresed, it is
+*	decompressed before being stored.
+*************************************************************************************/
+int lowlog_dump_read(char *filename, char *buf, int buf_size);
+
+/*************************************************************************************
+* Description: 
+* 	Reads the most recent log from a file and stores it in a buffer. If the log is compresed, it is
+*	decompressed before being stored.
+*************************************************************************************/
+int lowlog_dump_read_recent(char *buf, int buf_size);
+#endif

os/kernel/binary_manager/binary_manager_recovery.c

@@ -42,6 +42,10 @@
 #include "semaphore/semaphore.h"
 #include "binary_manager_internal.h"
 
+#ifdef CONFIG_LOWLOG_DUMP
+#include <tinyara/log_dump/lowlog_dump.h>
+#endif
+
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
@@ -345,6 +349,12 @@ void binary_manager_recovery(int bin_idx)
 		bmlldbg("Failed to deactivate binary, bin idx %d\n", bin_idx);
 		goto reboot_board;
 	}
+#endif
+#ifdef CONFIG_LOWLOG_DUMP
+	lowlog_dump_save();
+#ifdef CONFIG_LOWLOG_DUMP_REBOOT
+	binary_manager_reset_board(REBOOT_SYSTEM_BINARY_RECOVERYFAIL);
+#endif
 #endif
 	/* Create loader to reload binary */
 	ret = binary_manager_execute_loader(LOADCMD_RELOAD, bin_idx);

os/kernel/log_dump/Kconfig

@@ -0,0 +1,50 @@
+#
+# For a description of the syntax of this configuration file,
+# see kconfig-language at https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt
+#
+
+
+config LOWLOG_DUMP
+	bool "enable lowlog dump"
+	default n
+    depends on BINMGR_RECOVERY
+	---help---
+        This saves the lowlog.
+
+if LOWLOG_DUMP
+
+config LOWLOG_DUMP_COMPRESS
+    bool "LOWLOG_DUMP_COMPRESS"
+    default y
+    ---help---
+        Controls whether compression is applied.
+        if the value is n compression is not performed.
+
+
+config LOWLOG_DUMP_BUF_SIZE
+    int "LOWLOG_DUMP_BUF_SIZE"
+    default 8192
+    ---help---
+        Determines the size of the buffer where crash logs will be stored.
+        The low log is stored in the data section.
+
+config LOWLOG_DUMP_REBOOT
+    bool "REBOOT_AFTER_SAVING_LOG"
+    default y
+    ---help---
+        Determines whether to reboot after saving the low log.
+
+config LOWLOG_DUMP_MAX_FILES
+    int "LOWLOG_DUMP_MAX_FILES"
+    default 5
+    ---help---
+        Determine the maximum number of low log files to be stored.
+
+config LOWLOG_DUMP_RECORD_TIME
+    bool "LOWLOG_DUMP_RECORD_TIME"
+    default n
+    ---help---
+        Measure and record the time it takes to save the crash log to a file.
+
+endif # LOWLOG_DUMP
+

os/kernel/log_dump/Make.defs

@@ -24,3 +24,10 @@ DEPPATH += --dep-path log_dump
 VPATH += :log_dump
 
 endif
+
+ifeq ($(CONFIG_LOWLOG_DUMP),y)
+
+CSRCS += lowlog_dump_read.c lowlog_dump_ch.c lowlog_dump_save.c
+CSRCS += lowlog_dump_resume.c lowlog_dump_pause.c
+
+endif # CONFIG_LOWLOG_DUMP

os/kernel/log_dump/lowlog_dump.h

@@ -0,0 +1,71 @@
+/****************************************************************************
+ *
+ * Copyright 2025 Samsung Electronics All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __SCHED_LOWLOG_DUMP_H
+#define __SCHED_LOWLOG_DUMP_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <tinyara/config.h>
+
+#ifdef CONFIG_LOWLOG_DUMP
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <tinyara/clock.h>
+#include <tinyara/log_dump/lowlog_dump.h>
+#include <dirent.h>
+#include <ctype.h>
+#include <fcntl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+#define DIR_PATH "/mnt/lowlog_dump"
+#define MAX_FILENAME_LEN 64
+#define PRE_FILENAME_UNCOMP "lowlog_dump"
+#define PRE_FILENAME_COMP "lowlog_dump_comp"
+#define REQUIRED_HEAP_FOR_COMPRESS 400000
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+typedef struct {
+    int number;
+    char name[MAX_FILENAME_LEN];
+} FileEntry;
+
+/****************************************************************************
+ * Function Prototypes
+ ****************************************************************************/
+void lowlog_dump_init(void);
+void lowlog_dump_init_flag(void);
+void lowlog_dump_init_buf(void);
+char *lowlog_dump_get_buf(void);
+int lowlog_dump_is_valid_filename(const char *name, int *out_number);
+int lowlog_dump_get_size(void);
+int lowlog_dump_set_store_flag(int flag);
+
+#endif							/* CONFIG_LOWLOG_DUMP */
+#endif							/* __SCHED_LOWLOG_DUMP_H */

os/kernel/log_dump/lowlog_dump_ch.c

@@ -0,0 +1,104 @@
+/****************************************************************************
+ *
+ * Copyright 2025 Samsung Electronics All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+#include <tinyara/config.h>
+#include <tinyara/compression.h>
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <tinyara/clock.h>
+#include "lowlog_dump.h"
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+static char g_lowlog[CONFIG_LOWLOG_DUMP_BUF_SIZE];
+int g_lowlog_index = 0;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+/*************************************************************************************
+* Name: lowlog_dump_get_size
+*
+* Description: 
+*   Gets the size (in bytes) of the log currently stored in the buffer.
+*
+*************************************************************************************/
+int lowlog_dump_get_size()
+{
+	return g_lowlog_index;
+}
+
+/*************************************************************************************
+* Name: lowlog_dump_init_buf
+*
+* Description:
+*   init global buf
+*
+*************************************************************************************/
+//TODO : It may be necessary to remove this function.
+void lowlog_dump_init_buf()
+{
+	for (int i = 0; i < CONFIG_LOWLOG_DUMP_BUF_SIZE; i++) {
+		g_lowlog[i] = '\0';
+	}
+	g_lowlog_index = 0;
+}
+
+/*************************************************************************************
+* Name: lowlog_dump_get_buf
+*
+* Description:
+*   return lowlog buf
+*
+*************************************************************************************/
+char *lowlog_dump_get_buf()
+{
+	return g_lowlog;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+/*************************************************************************************
+* Name: crashlog_writer_crashlog_to_buffer
+*
+* Description: 
+*   Stores the crash log into the buffer.
+*   This is used to store logs that are output via lldbg() during a user crash situation into a buffer.
+*************************************************************************************/
+void lowlog_dump_save_ch(char ch)
+{
+	if (lowlog_dump_get_store_flag() && g_lowlog_index < CONFIG_LOWLOG_DUMP_BUF_SIZE) {
+		g_lowlog[g_lowlog_index++] = ch;
+	}
+}
+