xref: /subsys/debug/Kconfig

# Debug configuration options

# Copyright (c) 2015 Wind River Systems, Inc.
# SPDX-License-Identifier: Apache-2.0


menu "System Monitoring Options"

source "subsys/debug/thread_analyzer/Kconfig"

endmenu

menu "Debugging Options"

config DEBUG
	bool "Build kernel with debugging enabled"
	help
	  Build a kernel suitable for debugging.  Right now, this option
	  only disables optimization, more debugging variants can be selected
	  from here to allow more debugging.

config GPROF
	bool "Generate profiling information"
	depends on ARCH_POSIX
	help
	  Generate call graph profile data for the application that can be
	  analyzed with gprof

config ASAN
	bool "Build with address sanitizer"
	depends on ARCH_POSIX
	help
	  Builds Zephyr with Address Sanitizer enabled. This is currently
	  only supported by boards based on the posix architecture, and requires a
	  recent-ish compiler with the ``-fsanitize=address`` command line option,
	  and the libasan library.

	  Note that at exit leak detection is disabled for 64-bit boards when
	  GCC is used due to potential risk of a deadlock in libasan.
	  This behavior can be changes by adding leak_check_at_exit=1 to the
	  environment variable ASAN_OPTIONS.

config ASAN_RECOVER
	bool "Continue after sanitizer errors"
	depends on ASAN
	default y
	help
	  The default behavior of compiler sanitizers is to exit after
	  the first error.  Set this to y to enable the code to
	  continue, which can be useful if a code base has known
	  unsuppressed errors.  You will also need to set
	  "halt_on_error=0" in your ASAN_OPTIONS environment variable
	  at runtime.

config ASAN_NOP_DLCLOSE
	bool "Override host OS dlclose() with a NOP"
	default y if HAS_SDL
	depends on ASAN
	help
	  Override host OS dlclose() with a NOP.

	  This NOP implementation is needed as workaround for a known limitation in
	  LSAN (leak sanitizer) that if dlcose is called before performing the leak
	  check, "<unknown module>" is reported in the stack traces during the leak
	  check and these can not be suppressed, see
	  https://github.com/google/sanitizers/issues/89 for more info.

config UBSAN
	bool "Build with undefined behavior sanitizer"
	help
	  Builds Zephyr with Undefined Behavior Sanitizer enabled.  This
	  requires a recent-ish compiler with the ``-fsanitize=undefined``
	  command line option.

choice UBSAN_MODE
	prompt "Undefined behavior sanitizer mode"
	depends on UBSAN
	default UBSAN_LIBRARY

config UBSAN_LIBRARY
	bool "Call ubsan routines"
	depends on ARCH_POSIX || PICOLIBC
	help
	  Call ubsan library routines when undefined behavior is detected
	  at runtime. This provides information about the faulting
	  condition along with the source filename, line number, types and
	  values involved.  This is currently only supported by boards
	  based on the posix architecture or when building with picolibc.

config UBSAN_TRAP
	bool "Call __builtin_trap"
	help
	  When undefined behavior is detected, invoke __builtin_trap to
	  cause an exception to be raised. This can be used on any target,
	  but the lack of information makes figuring out the triggering
	  code difficult.

endchoice

config MSAN
	bool "Build with memory sanitizer"
	depends on ARCH_POSIX
	help
	  Builds Zephyr with the LLVM MemorySanitizer enabled.  Works
	  only on the posix architecture currently, and only with host
	  compilers recent enough to support the feature (currently
	  clang on x86_64 only).  It cannot be used in tandem with
	  CONFIG_ASAN due to clang limitations.  You must choose one
	  or the other (but can combine it with CONFIG_UBSAN if you
	  like)

config STACK_USAGE
	bool "Generate stack usage information"
	help
	  Generate an extra file that specifies the maximum amount of stack used,
	  on a per-function basis.

config STACK_SENTINEL
	bool "Stack sentinel"
	select THREAD_STACK_INFO
	depends on MULTITHREADING
	depends on !USERSPACE
	depends on !MPU_STACK_GUARD
	help
	  Store a magic value at the lowest addresses of a thread's stack.
	  Periodically check that this value is still present and kill the
	  thread gracefully if it isn't. This is currently checked in four
	  places:

	  1) Upon any context switch for the outgoing thread
	  2) Any hardware interrupt that doesn't context switch, the check is
	     performed for the interrupted thread
	  3) When a thread returns from its entry point
	  4) When a thread calls k_yield() but doesn't context switch

	  This feature doesn't prevent corruption and the system may be
	  in an unusable state. However, given the bizarre behavior associated
	  with stack overflows, knowledge that this is happening is very
	  useful.

	  This feature is intended for those systems which lack hardware support
	  for stack overflow protection, or have insufficient system resources
	  to use that hardware support.

config PRINTK
	bool "Send printk() to console"
	default y
	help
	  This option directs printk() debugging output to the supported
	  console device, rather than suppressing the generation
	  of printk() output entirely. Output is sent immediately, without
	  any mutual exclusion or buffering.

config PRINTK_BUFFER_SIZE
	int "printk() buffer size"
	depends on PRINTK
	depends on USERSPACE
	default 32
	help
	  If userspace is enabled, printk() calls are buffered so that we do
	  not have to make a system call for every character emitted. Specify
	  the size of this buffer.

config EARLY_CONSOLE
	bool "Send stdout at the earliest stage possible"
	help
	  This option will enable stdout as early as possible, for debugging
	  purpose. For instance, in case of STDOUT_CONSOLE being set it will
	  initialize its driver earlier than normal, in order to get the stdout
	  sent through the console at the earliest stage possible.

config ASSERT
	bool "__ASSERT() macro"
	default y if TEST
	help
	  This enables the __ASSERT() macro in the kernel code. If an assertion
	  fails, the policy for what to do is controlled by the implementation
	  of the assert_post_action() function, which by default will trigger
	  a fatal error.

	  Disabling this option will cause assertions to compile to nothing,
	  improving performance and system footprint.

if ASSERT

config ASSERT_LEVEL
	int "__ASSERT() level"
	default 2
	range 0 2
	help
	  This option specifies the assertion level used by the __ASSERT()
	  macro. It can be set to one of three possible values:

	  Level 0: off
	  Level 1: on + warning in every file that includes __assert.h
	  Level 2: on + no warning

config SPIN_VALIDATE
	bool "Spinlock validation"
	depends on MULTITHREADING
	depends on MP_MAX_NUM_CPUS <= 4
	default y if !FLASH || FLASH_SIZE > 32
	help
	  There's a spinlock validation framework available when asserts are
	  enabled. It adds a relatively hefty overhead (about 3k or so) to
	  kernel code size, don't use on platforms known to be small.

config SPIN_LOCK_TIME_LIMIT
	int "Spin lock holding time limit in cycles"
	default 0
	depends on SPIN_VALIDATE
	depends on SYSTEM_CLOCK_LOCK_FREE_COUNT
	help
	  Assert at the time of unlocking the number of system clock cycles
	  the lock has been held is less than the configured value. Requires
	  the timer driver sys_clock_get_cycles_32() be lock free.

endif # ASSERT

config FORCE_NO_ASSERT
	bool "Force-disable no assertions"
	help
	  This boolean option disables Zephyr assertion testing even
	  in circumstances (twister) where it is enabled via
	  CFLAGS and not Kconfig.  Added solely to be able to work
	  around compiler bugs for specific tests.

config ASSERT_VERBOSE
	bool "Verbose assertions"
	default y
	depends on PRINTK
	help
	  This option enables printing an assert message with information about
	  the assertion that occurred. This includes printing the location,
	  the conditional expression and additional message specific to the
	  assert.

config ASSERT_NO_FILE_INFO
	bool "Disable file info for asserts"
	help
	  This option removes the name and the path of the source file
	  in which the assertion occurred. Enabling this will save
	  target code space, and thus may be necessary for tiny targets.

config ASSERT_NO_COND_INFO
	bool "Disable condition info for asserts"
	help
	  This option removes the assert condition from the printed assert
	  message. Enabling this will save target code space, and thus may be
	  necessary for tiny targets. It is recommended to disable condition
	  info before disabling file info since the condition can be found in
	  the source using file info.

config ASSERT_NO_MSG_INFO
	bool "Disable message for asserts"
	help
	  This option removes the additional message from the printed assert.
	  Enabling this will save target code space, and thus may be
	  necessary for tiny targets. It is recommended to disable message
	  before disabling file info since the message can be found in the
	  source using file info.

config ASSERT_TEST
	bool "Assert test mode"
	help
	  This option enables the assert test mode, which allows the assert
	  post action handler to return (i.e. not abort) when the asserted
	  condition is false. The tests that validate the assert feature may
	  select this option to allow the test to proceed by implementing a
	  custom assert post action hook.

config OVERRIDE_FRAME_POINTER_DEFAULT
	bool "Override compiler defaults for -fomit-frame-pointer"
	help
	  Omitting the frame pointer prevents the compiler from putting the stack
	  frame pointer into a register. Saves a few instructions in function
	  prologues/epilogues and frees up a register for general-purpose use,
	  which can provide good performance improvements on register-constrained
	  architectures like x86. On some architectures (including x86) omitting
	  frame pointers impedes debugging as local variables are harder to
	  locate. At -O1 and above gcc will enable -fomit-frame-pointer
	  automatically but only if the architecture does not require if for
	  effective debugging.

	  Choose Y if you want to override the default frame pointer behavior
	  of your compiler, otherwise choose N.

config OMIT_FRAME_POINTER
	bool "Omit frame pointer"
	depends on !FRAME_POINTER
	depends on OVERRIDE_FRAME_POINTER_DEFAULT
	help
	  Choose Y for best performance. On some architectures (including x86)
	  this will favor code size and performance over debuggability.

	  Choose N in you wish to retain the frame pointer. This option may
	  be useful if your application uses runtime backtracing and does not
	  support parsing unwind tables.

	  If unsure, disable OVERRIDE_FRAME_POINTER_DEFAULT to allow the compiler
	  to adopt sensible defaults for your architecture.


#
# Generic Debugging Options
#
config EXCEPTION_STACK_TRACE
	bool "Attempt to print stack traces upon exceptions"
	default y
	depends on ARCH_STACKWALK
	help
	  If the architecture fatal handling code supports it, attempt to
	  print a stack trace of function memory addresses when an
	  exception is reported.

#
# Miscellaneous debugging options
#
config DEBUG_THREAD_INFO
	bool "Thread awareness support"
	depends on !SMP
	select THREAD_MONITOR
	select THREAD_NAME
	help
	  This option exports an array of offsets to kernel structs to allow
	  for debugger RTOS plugins to determine the state of running threads.

rsource "coredump/Kconfig"
rsource "symtab/Kconfig"
endmenu

rsource "gdbstub/Kconfig"

config SEGGER_DEBUGMON
	bool "Use Segger's J-Link debug monitor implementation"
	depends on CORTEX_M_DEBUG_MONITOR_HOOK
	help
	  This option will enable Segger's implementation of
	  the debug monitor interrupt, overriding the
	  default z_arm_debug_monitor symbol.

config MIPI_STP_DECODER
	bool "MIPI STPv2 decoder"
	depends on !BIG_ENDIAN
	help
	  Module decodes a stream of STPv2 data.

config CS_TRACE_DEFMT
	bool "Coresight Trace Deformatter"
	help
	  Module is decoding data which is formatted using Coresight
	  Trace Formatter, e.g. when data is put into ETR (Embedded Trace Router).

config CPU_LOAD
	select TRACING
	depends on CPU_CORTEX_M || RISCV
	depends on !SMP
	bool "CPU load measurement"

# Workaround for not being able to have commas in macro arguments
DT_CHOSEN_Z_CPU_LOAD_COUNTER := zephyr,cpu-load-counter

config CPU_LOAD_USE_COUNTER
	bool "Use counter"
	depends on $(dt_chosen_enabled,$(DT_CHOSEN_Z_CPU_LOAD_COUNTER))
	default y
	select COUNTER
	help
	  Use counter for tracking CPU idle time.

config CPU_LOAD_LOG_PERIODICALLY
	int "Report period (in milliseconds)"
	depends on LOG
	default 0
	help
	  Specifies how often CPU load shall be logged. 0 means that there is no logging.

module = CPU_LOAD
module-str = cpu_load
source "subsys/logging/Kconfig.template.log_config"