bc234fb1af
Picolibc inherited its malloc arena configuration from newlib instead of from minimal libc. This ended up making it a bit too fragile to run the full set of zephyr tests. In particular: * Z_MALLOC_PARTITION_EXISTS would get set when not used * Setting an arena size depended on a bunch of other values, including whether the system had an MMU or MPU, and whether the MPU required power-of-two alignment or not. This patch cleans things up so that there is a single heap size specifier, PICOLIBC_HEAP_SIZE. * If PICOLIBC_HEAP_SIZE is positive, this sets the size of the heap. On MMU systems, picolibc will only use the remaining memory if that's smaller. * If PICOLIBC_HEAP_SIZE is zero, then there is no heap available and malloc will always fail. This also disables Z_MALLOC_PARTITION_EXISTS. * If PICOLIBC_HEAP_SIZE is negative, then picolibc uses all remaining memory for the malloc heap. The defaults are designed to allow tests to work without requiring additional settings. * For MMU enabled systems, the default value is 1048576. It would be nice to have this use 'all available memory', but that's difficult to manage as the API which returns free memory (k_mem_free_get) doesn't take into account the amount of free virtual address space. * For MPU enabled systems which require power-of-two aligned MPU regions, the default value is 64kB. * For other systems, the default value is -1, indicating that all available memory be used for the malloc arena. Signed-off-by: Keith Packard <keithp@keithp.com>
165 lines
4.7 KiB
Plaintext
165 lines
4.7 KiB
Plaintext
# Copyright © 2021 Amazon.com, Inc. or its affiliates.
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# SPDX-License-Identifier: Apache-2.0
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config PICOLIBC_USE_MODULE
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bool "Use picolibc module"
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default y
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select PICOLIBC_MODULE
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help
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Use picolibc module instead of picolibc included with toolchain
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config PICOLIBC_HEAP_SIZE
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int "Picolibc heap size (bytes)"
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default 1048576 if MMU
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default 65536 if USERSPACE && MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT
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default -1
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help
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Indicates the amount of memory which will be used by the picolibc
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malloc() heap.
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If user mode is enabled, and MPU hardware has requirements that
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regions be sized to a power of two and aligned to their size,
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then this must be defined as a power of two or a compile error
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will result.
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If set to zero, then no malloc() heap will be available.
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If set to -1, then all remaining system RAM will be used for this
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area.
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config PICOLIBC_IO_LONG_LONG
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bool "support for long long in integer-only printf/scanf"
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default n
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help
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Includes support for long long in integer-only printf/scanf. long long
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types are always supported in the floating-point versions.
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config PICOLIBC_IO_FLOAT
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bool "support for floating point values in printf/scanf"
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default n
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help
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Include floating point support in printf/scanf functions.
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if PICOLIBC_USE_MODULE
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if PICOLIBC
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choice PICOLIBC_OPTIMIZATIONS
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prompt "Optimization level"
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default PICOLIBC_SIZE_OPTIMIZATIONS if SIZE_OPTIMIZATIONS
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default PICOLIBC_SPEED_OPTIMIZATIONS if SPEED_OPTIMIZATIONS
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default PICOLIBC_DEBUG_OPTIMIZATIONS if DEBUG_OPTIMIZATIONS
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default PICOLIBC_NO_OPTIMIZATIONS if NO_OPTIMIZATIONS
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help
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Note that these flags shall only control the compiler
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optimization level for picolibc, not the level for the
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rest of Zephyr
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config PICOLIBC_SIZE_OPTIMIZATIONS
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bool "Optimize for size"
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help
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Compiler optimizations will be set to -Os independently of other
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options.
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config PICOLIBC_SPEED_OPTIMIZATIONS
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bool "Optimize for speed"
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help
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Compiler optimizations will be set to -O2 independently of other
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options.
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config PICOLIBC_DEBUG_OPTIMIZATIONS
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bool "Optimize debugging experience"
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help
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Compiler optimizations will be set to -Og independently of other
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options.
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config PICOLIBC_NO_OPTIMIZATIONS
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bool "Optimize nothing"
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help
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Compiler optimizations will be set to -O0 independently of other
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options.
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endchoice
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config PICOLIBC_FAST_STRCMP
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bool "always use fast strcmp paths"
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default y
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help
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This provides a faster strcmp version even when libc is
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built in space-optimized mode
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config PICOLIBC_IO_C99_FORMATS
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bool "support C99 format additions in printf/scanf"
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default y
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help
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Includes support for hex floats (in floating-point version) and j, z,
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t size modifiers.
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config PICOLIBC_IO_POS_ARGS
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bool "Support POSIX positional args (e.g. %$1d) in printf/scanf"
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default y
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depends on !PICOLIBC_IO_FLOAT
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help
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Includes support for positional args (e.g. $1) in integer-only printf
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and scanf. Positional args are always supported in the floating-point
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versions.
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config PICOLIBC_IO_FLOAT_EXACT
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bool "support for exact float/string conversion"
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default y
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depends on PICOLIBC_USE_MODULE
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help
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Uses Ryu algorithm for exact binary/decimal float conversions.
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This ensures that printf values with enough digits can be
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fed to scanf and generate exactly the same binary value.
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config PICOLIBC_LOCALE_INFO
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bool "support locales in libc functions"
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default n
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depends on PICOLIBC_USE_MODULE
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help
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Includes code for basic locale support
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config PICOLIBC_LOCALE_EXTENDED_INFO
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bool "support extended locales in libc functions"
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default n
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depends on PICOLIBC_USE_MODULE
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help
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Includes code for extended locale support
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config PICOLIBC_MULTIBYTE
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bool "support multibyte functions in libc"
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default n
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depends on PICOLIBC_USE_MODULE
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help
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Includes code for multi-byte characters
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config PICOLIBC_PICOEXIT
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bool "use smaller atexit/onexit implementation"
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default y
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depends on PICOLIBC_USE_MODULE
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help
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Provides a simpler atexit/onexit implementation that doesn't use
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malloc, but only supports a small number (32) of exit handlers.
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config PICOLIBC_MULTITHREAD
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bool "support multiple threads using retargetable locking API"
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default y
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depends on PICOLIBC_USE_MODULE
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help
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Protects shared data structures in libc with mutexes that use
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an API which can be retargeted to OS provided routines.
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config PICOLIBC_GLOBAL_ERRNO
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bool "use a single global variable for errno"
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depends on PICOLIBC_USE_MODULE
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help
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Picolibc usually uses a TLS variable for errno, ensuring that
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multiple threads have a reliable mechanism for detecting libc
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exceptions. This option switches to a single global errno variable,
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which can be used to avoid TLS variable usage by the library if
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necessary.
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endif
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endif
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