first

rt-thread/components/libc/compilers/picolibc/README.md

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+# PICOLIBC (LLVM-ARM) porting for RT-Thread
+
+https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm
+
+https://github.com/picolibc/picolibc
+
+
+

rt-thread/components/libc/compilers/picolibc/SConscript

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+import os
+from building import *
+Import('rtconfig')
+
+group = []
+
+if rtconfig.PLATFORM == 'gcc':
+  from gcc import *
+elif rtconfig.PLATFORM == 'llvm-arm':
+  from llvm_arm import *
+else:
+  Return('group')
+
+picolibc_version = GetPicoLibcVersion(rtconfig)
+
+if picolibc_version and not GetDepend('RT_USING_EXTERNAL_LIBC'):
+    print('PicoLibc version: ' + picolibc_version)
+
+    cwd = GetCurrentDir()
+    src = Glob('*.c')
+
+    CPPPATH = [cwd]
+    CPPDEFINES = ['RT_USING_PICOLIBC', 'RT_USING_LIBC', '_POSIX_C_SOURCE=1', '__PICOLIBC_ERRNO_FUNCTION=pico_get_errno'] # identify this is Newlib, and only enable POSIX.1-1990
+    # LIBS = ['c', 'm'] # link libc and libm
+    AddDepend(['RT_USING_PICOLIBC', 'RT_USING_LIBC'])
+
+    group = group + DefineGroup('Compiler', src, depend = [''], CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES)#, LIBS = LIBS)
+
+    list = os.listdir(cwd)
+    for d in list:
+        path = os.path.join(cwd, d)
+        if os.path.isfile(os.path.join(path, 'SConscript')):
+            group = group + SConscript(os.path.join(d, 'SConscript'))
+
+Return('group')

rt-thread/components/libc/compilers/picolibc/exit.c

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+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#include <rtthread.h>
+#include <sys/types.h>
+#include <posix/stdlib.h>
+
+/* for exit() and abort() */
+rt_noreturn void _exit (int status)
+{
+    __rt_libc_exit(status);
+    while(1);
+}

rt-thread/components/libc/compilers/picolibc/fcntl.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-09-02     Meco Man     First version
+ */
+
+#ifndef __FCNTL_H__
+#define __FCNTL_H__
+
+#include <sys/_default_fcntl.h>
+
+#ifndef O_EXEC
+#define O_EXEC      0x400000
+#endif
+
+#ifndef O_TMPFILE
+#define O_TMPFILE   0x800000
+#endif
+
+#ifndef O_BINARY
+#define O_BINARY 0x10000
+#endif
+
+#ifndef O_NOFOLLOW
+#define O_NOFOLLOW 0x100000
+#endif
+
+#ifndef O_DIRECTORY
+#define O_DIRECTORY 0x200000
+#endif
+
+#endif

rt-thread/components/libc/compilers/picolibc/iob.c

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+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#include <rtthread.h>
+#include <sys/types.h>
+#include <stdio.h>
+#include <unistd.h>
+#ifdef RT_USING_POSIX_STDIO
+#include <posix/stdio.h>
+#endif /* RT_USING_POSIX_STDIO */
+#define DBG_TAG    "picolibc.iob"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+#ifdef TINY_STDIO
+
+static int __fputc(char c, FILE *file);
+static int __fgetc(FILE *file);
+
+static FILE __stdio_in = FDEV_SETUP_STREAM(NULL, __fgetc, NULL, _FDEV_SETUP_READ);
+static FILE __stdio_out = FDEV_SETUP_STREAM(__fputc, NULL, NULL, _FDEV_SETUP_WRITE);
+
+#ifdef __strong_reference
+#define STDIO_ALIAS(x) __strong_reference(stdout, x);
+#else
+#define STDIO_ALIAS(x) FILE *const x = &__stdio_out;
+#endif
+
+FILE *const stdin = &__stdio_in;
+FILE *const stdout = &__stdio_out;
+STDIO_ALIAS(stderr);
+
+static int __fputc(char c, FILE *file)
+{
+    if (file == &__stdio_out)
+    {
+#if defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE)
+        rt_device_t console = rt_console_get_device();
+        if (console)
+        {
+            rt_ssize_t rc = rt_device_write(console, -1, &c, 1);
+            return rc > 0 ? rc : -1;
+        }
+#endif /* defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE) */
+    }
+
+    return -1;
+}
+
+static int __fgetc(FILE *file)
+{
+    if (file == &__stdio_in)
+    {
+#ifdef RT_USING_POSIX_STDIO
+        if (rt_posix_stdio_get_console() >= 0)
+        {
+            char c;
+            int rc = read(STDIN_FILENO, &c, 1);
+            return rc == 1 ? c : EOF;
+        }
+#endif /* RT_USING_POSIX_STDIO */
+    }
+
+    return EOF;
+}
+
+#endif

rt-thread/components/libc/compilers/picolibc/syscall.c

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023-05-17     Flybreak     the first version
+ */
+
+#include <rtthread.h>
+#include <sys/types.h>
+
+/* global errno */
+static volatile int __pico_errno;
+
+int *pico_get_errno(void)
+{
+    rt_thread_t tid = RT_NULL;
+
+    if (rt_interrupt_get_nest() != 0)
+    {
+        /* it's in interrupt context */
+        return (int *)&__pico_errno;
+    }
+
+    tid = rt_thread_self();
+    if (tid == RT_NULL)
+    {
+        return (int *)&__pico_errno;
+    }
+
+    return (int *)&tid->error;
+}
+
+#ifdef RT_USING_HEAP
+void *malloc(size_t n)
+{
+    return rt_malloc(n);
+}
+RTM_EXPORT(malloc);
+
+void *realloc(void *rmem, size_t newsize)
+{
+    return rt_realloc(rmem, newsize);
+}
+RTM_EXPORT(realloc);
+
+void *calloc(size_t nelem, size_t elsize)
+{
+    return rt_calloc(nelem, elsize);
+}
+RTM_EXPORT(calloc);
+
+void free(void *rmem)
+{
+    rt_free(rmem);
+}
+RTM_EXPORT(free);
+#endif /* RT_USING_HEAP */