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Various Qemu Cortex M3 ports now support picolibc (#1364)

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* Various Qemu Cortex M3 ports now support picolibc

Allow various Qemu Cortex M3 ports to compile against
picolibc. Also support "-flto" to work correctly.
Tested with picolibc in current Debian 13.
Just use "PICOLIBC=1 make" to switch over from default newlib.

Signed-off-by: Florian La Roche <Florian.LaRoche@gmail.com>

* Add ffreestanding

Signed-off-by: Ubuntu <ubuntu@ip-172-31-15-241.ap-south-1.compute.internal>

* Fix formatting check

Signed-off-by: Ubuntu <ubuntu@ip-172-31-15-241.ap-south-1.compute.internal>

---------

Signed-off-by: Florian La Roche <Florian.LaRoche@gmail.com>
Signed-off-by: Ubuntu <ubuntu@ip-172-31-15-241.ap-south-1.compute.internal>
Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com>
Co-authored-by: Ubuntu <ubuntu@ip-172-31-15-241.ap-south-1.compute.internal>
This commit is contained in:
Florian La Roche 2025-08-13 16:45:54 +02:00 • committed by GitHub
parent 51467d89e0
commit 1aa47857a0
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
10 changed files with 96 additions and 34 deletions
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21
FreeRTOS-Plus/Demo/FreeRTOS_Plus_TCP_Echo_Qemu_mps2/Makefile
View file

@ -51,31 +51,38 @@ SOURCE_FILES += ${FREERTOS_TCP}/source/portable/BufferManagement/BufferAllocatio
SOURCE_FILES += ${FREERTOS_TCP}/source/portable/NetworkInterface/MPS2_AN385/NetworkInterface.c
SOURCE_FILES += ${FREERTOS_TCP}/source/portable/NetworkInterface/MPS2_AN385/ether_lan9118/smsc9220_eth_drv.c
DEFINES := -DHEAP3
CPPFLAGS += $(DEFINES)
CPPFLAGS += -DHEAP3
ifeq ($(PICOLIBC), 1)
CFLAGS += --specs=picolibc.specs -DPICOLIBC_INTEGER_PRINTF_SCANF --oslib=semihost
endif
CFLAGS += -mthumb -mcpu=cortex-m3
ifeq ($(DEBUG), 1)
CFLAGS += -g3 -Og -ffunction-sections -fdata-sections
else
CFLAGS += -Os -ffunction-sections -fdata-sections
endif
CFLAGS += -MMD
#CFLAGS += -flto
CFLAGS += -Wall -Wextra -Wshadow
#CFLAGS += -Wpedantic -fanalyzer
#CFLAGS += -flto
CFLAGS += -MMD
CFLAGS += $(INCLUDE_DIRS)
LDFLAGS = -T mps2_m3.ld
LDFLAGS += -Xlinker -Map=${BUILD_DIR}/output.map
LDFLAGS += -Xlinker --gc-sections
LDFLAGS += -nostartfiles -specs=nano.specs -specs=nosys.specs -specs=rdimon.specs
#LDFLAGS += -Xlinker --print-gc-sections
ifeq ($(PICOLIBC), 1)
LDFLAGS += -nostartfiles
else
LDFLAGS += -nostartfiles -specs=nano.specs -specs=nosys.specs -specs=rdimon.specs
endif
OBJ_FILES := $(SOURCE_FILES:%.c=$(BUILD_DIR)/%.o)
.PHONY: clean
$(BUILD_DIR)/$(BIN) : $(OBJ_FILES)
$(BUILD_DIR)/$(BIN): $(OBJ_FILES)
$(CC) $(CFLAGS) $(LDFLAGS) $+ -o $(@)
$(SIZE) $(@)
@ -88,7 +95,7 @@ $(BUILD_DIR)/$(BIN) : $(OBJ_FILES)
INCLUDES := $(SOURCE_FILES:%.c=$(BUILD_DIR)/%.d)
-include $(INCLUDES)
${BUILD_DIR}/%.o : %.c Makefile
${BUILD_DIR}/%.o: %.c Makefile
-mkdir -p $(@D)
$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@

9
FreeRTOS-Plus/Demo/FreeRTOS_Plus_TCP_Echo_Qemu_mps2/main_networking.c
View file

@ -142,7 +142,10 @@ static UBaseType_t ulNextRand;
void main_tcp_echo_client_tasks( void )
{
BaseType_t xReturn;
const uint32_t ulLongTime_ms = pdMS_TO_TICKS( 1000UL );
#ifndef __PICOLIBC__
const uint32_t ulLongTime_ms = pdMS_TO_TICKS( 1000UL );
#endif
/*
* Instructions for using this project are provided on:
@ -203,7 +206,9 @@ void main_tcp_echo_client_tasks( void )
* really applicable to the Linux simulator port). */
for( ; ; )
{
usleep( ulLongTime_ms * 1000 );
#ifndef __PICOLIBC__
usleep( ulLongTime_ms * 1000 );
#endif
}
}
/*-----------------------------------------------------------*/

2
FreeRTOS-Plus/Demo/FreeRTOS_Plus_TCP_Echo_Qemu_mps2/mps2_m3.ld
View file

@ -124,8 +124,10 @@ SECTIONS
PROVIDE ( end = . );
PROVIDE ( _end = . );
_heap_bottom = .;
__heap_start = .;
. = . + _Min_Heap_Size;
_heap_top = .;
__heap_end = .;
. = . + _Min_Stack_Size;
. = ALIGN(8);
} >RAM

23
FreeRTOS-Plus/Demo/FreeRTOS_Plus_TCP_Echo_Qemu_mps2/syscalls.c
View file

@ -30,6 +30,7 @@ extern "C" {
#include <sys/types.h>
void uart_init( void );
#ifndef __PICOLIBC__
__attribute__( ( used ) ) int _fstat( int file );
int _read( int file,
char * buf,
@ -39,6 +40,7 @@ int _write( int file,
int len );
void * _sbrk( int incr );
#endif
typedef struct UART_t
{
@ -55,10 +57,12 @@ typedef struct UART_t
#define UART_CTRL_TX_EN ( 1 << 0 )
#ifndef __PICOLIBC__
extern unsigned long _heap_bottom;
extern unsigned long _heap_top;
static char * heap_end = ( char * ) &_heap_bottom;
#endif
/**
* @brief initializes the UART emulated hardware
@ -69,6 +73,24 @@ void uart_init( void )
UART0_ADDR->CTRL = UART_CTRL_TX_EN;
}
#ifdef __PICOLIBC__
#include <stdio.h>
int
_uart_putc(char c, FILE *file)
{
( void ) file;
UART_DR( UART0_ADDR ) = c;
return (unsigned char) c;
}
static FILE __stdio = FDEV_SETUP_STREAM(_uart_putc, NULL, NULL, _FDEV_SETUP_WRITE);
__attribute__( ( used ) ) FILE *const stdout = &__stdio;
#else
/**
* @brief not used anywhere in the code
* @todo implement if necessary
@ -138,6 +160,7 @@ void * _sbrk( int incr )
return prev_heap_end;
}
#endif
#ifdef __cplusplus
}