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 All unpublished rights reserved.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