pinebuds/platform/cmsis/retarget_gcc.cpp

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2022-08-15 04:20:27 -05:00
/***************************************************************************
*
* Copyright 2015-2019 BES.
* All rights reserved. All unpublished rights reserved.
*
* No part of this work may be used or reproduced in any form or by any
* means, or stored in a database or retrieval system, without prior written
* permission of BES.
*
* Use of this work is governed by a license granted by BES.
* This work contains confidential and proprietary information of
* BES. which is protected by copyright, trade secret,
* trademark and other intellectual property rights.
*
****************************************************************************/
#if (defined(__GNUC__) && !defined(__ARMCC_VERSION))
#if !defined(NOSTD) && !defined(MBED)
#define LIBC_HOOKS
#endif
#ifdef LIBC_HOOKS
#include <errno.h>
#include "hal_trace.h"
#ifndef FILEHANDLE
typedef int FILEHANDLE;
#endif
#define WEAK __attribute__((weak))
#define PACKED __attribute__((packed))
#include <sys/stat.h>
#include <sys/unistd.h>
#include <sys/syslimits.h>
#define PREFIX(x) x
extern "C" int PREFIX(_write)(FILEHANDLE fh, const unsigned char *buffer,
unsigned int length, int mode)
{
int n = 0; // n is the number of bytes written
if (fh < 3) {
hal_trace_output(buffer, length);
n = length;
}
return n;
}
extern "C" int PREFIX(_read)(FILEHANDLE fh, unsigned char *buffer,
unsigned int length, int mode)
{
int n = 0; // n is the number of bytes read
if (fh < 3) {
// only read a character at a time from stdin
// TODO: Read from trace uart input
n = 1;
}
return n;
}
#if defined(__GNUC__)
/* prevents the exception handling name demangling code getting pulled in */
namespace __gnu_cxx {
void __verbose_terminate_handler() {
ASSERT(0, "Exception");
}
}
extern "C" WEAK void __cxa_pure_virtual(void);
extern "C" WEAK void __cxa_pure_virtual(void)
{
_exit(1);
}
#endif
// Provide implementation of _sbrk (low-level dynamic memory allocation
// routine) for GCC_ARM which compares new heap pointer with MSP instead of
// SP. This make it compatible with RTX RTOS thread stacks.
#if defined(__GNUC__) && defined(__arm__)
// Linker defined symbol used by _sbrk to indicate where heap should start.
extern "C" int __end__;
extern "C" uint32_t __HeapLimit;
// Turn off the errno macro and use actual global variable instead.
#undef errno
extern "C" int errno;
// For ARM7 only
register unsigned char * stack_ptr __asm ("sp");
// Dynamic memory allocation related syscall.
extern "C" caddr_t _sbrk(int incr)
{
static unsigned char* heap = (unsigned char*)&__end__;
unsigned char* prev_heap = heap;
unsigned char* new_heap = heap + incr;
#if defined(TARGET_ARM7)
if (new_heap >= stack_ptr) {
#elif defined(TARGET_CORTEX_A)
if (new_heap >= (unsigned char*)&__HeapLimit) { /* __HeapLimit is end of heap section */
#else
if (new_heap >= (unsigned char*)&__HeapLimit) { /* __HeapLimit is end of heap section */
#endif
ASSERT(false, "_sbrk:Heap overflowed: start=%p end=%p cur=%p incr=%d",
(unsigned char*)&__end__, (unsigned char*)&__HeapLimit, heap, incr);
errno = ENOMEM;
return (caddr_t)-1;
}
TRACE(2,"_sbrk: incr %d cur=%p\n", incr, heap);
heap = new_heap;
return (caddr_t) prev_heap;
}
#endif
#if defined(__GNUC__) && defined(__arm__)
extern "C" void _exit(int return_code)
{
#else
namespace std {
extern "C" void exit(int return_code)
{
#endif
if (return_code) {
ASSERT(false, "system die: %d", return_code);
}
do { volatile int i = 0; i++; } while (1);
}
#if !(defined(__GNUC__) && defined(__arm__)) && !defined(TOOLCHAIN_GCC_CW)
} //namespace std
#endif
#endif /*LIBC_HOOKS*/
#endif // __GNUC__ && !__ARMCC_VERSION