pinebuds/platform/cmsis/retarget_gcc.cpp

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/***************************************************************************
*
* 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 All unpublished rights reserved.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
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#include "hal_trace.h"
#include <errno.h>
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#ifndef FILEHANDLE
typedef int FILEHANDLE;
#endif
#define WEAK __attribute__((weak))
#define PACKED __attribute__((packed))
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#include <sys/stat.h>
#include <sys/syslimits.h>
#include <sys/unistd.h>
#define PREFIX(x) x
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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;
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}
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;
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}
#if defined(__GNUC__)
/* prevents the exception handling name demangling code getting pulled in */
namespace __gnu_cxx {
void __verbose_terminate_handler() { ASSERT(0, "Exception"); }
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}
extern "C" WEAK void __cxa_pure_virtual(void);
extern "C" WEAK void __cxa_pure_virtual(void) { _exit(1); }
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#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;
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// 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");
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// 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;
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#if defined(TARGET_ARM7)
if (new_heap >= stack_ptr) {
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#elif defined(TARGET_CORTEX_A)
if (new_heap >=
(unsigned char *)&__HeapLimit) { /* __HeapLimit is end of heap section */
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#else
if (new_heap >=
(unsigned char *)&__HeapLimit) { /* __HeapLimit is end of heap section */
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#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;
}
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TRACE(2, "_sbrk: incr %d cur=%p\n", incr, heap);
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heap = new_heap;
return (caddr_t)prev_heap;
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}
#endif
#if defined(__GNUC__) && defined(__arm__)
extern "C" void _exit(int return_code) {
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#else
namespace std {
extern "C" void exit(int return_code) {
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#endif
if (return_code) {
ASSERT(false, "system die: %d", return_code);
}
do {
volatile int i = 0;
i++;
} while (1);
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}
#if !(defined(__GNUC__) && defined(__arm__)) && !defined(TOOLCHAIN_GCC_CW)
} // namespace std
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#endif
#endif /*LIBC_HOOKS*/
#endif // __GNUC__ && !__ARMCC_VERSION