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117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/*
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* Copyright (C) 2019 Gunar Schorcht
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* 2022 Otto-von-Guericke-Universität Magdeburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @{
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*
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* @file
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* @brief Implements various POSIX syscalls
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* @author Gunar Schorcht <gunar@schorcht.net>
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* @author Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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*/
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#include <stdio.h>
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#include <string.h>
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#include "architecture.h"
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#include "assert.h"
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#include "cpu.h"
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#include "irq.h"
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#include "kernel_defines.h"
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#include "mutex.h"
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extern void *__real_malloc(size_t size);
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extern void __real_free(void *ptr);
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extern void *__real_realloc(void *ptr, size_t size);
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static mutex_t _lock;
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void __attribute__((used)) *__wrap_malloc(size_t size)
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{
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uinttxtptr_t pc;
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if (IS_USED(MODULE_MALLOC_TRACING)) {
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pc = cpu_get_caller_pc();
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}
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assert(!irq_is_in());
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mutex_lock(&_lock);
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void *ptr = __real_malloc(size);
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mutex_unlock(&_lock);
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if (IS_USED(MODULE_MALLOC_TRACING)) {
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printf("malloc(%u) @ 0x%" PRIxTXTPTR " returned %p\n",
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(unsigned)size, pc, ptr);
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}
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return ptr;
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}
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void __attribute__((used)) __wrap_free(void *ptr)
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{
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if (IS_USED(MODULE_MALLOC_TRACING)) {
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uinttxtptr_t pc = cpu_get_caller_pc();
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printf("free(%p) @ 0x%" PRIxTXTPTR ")\n", ptr, pc);
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}
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assert(!irq_is_in());
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mutex_lock(&_lock);
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__real_free(ptr);
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mutex_unlock(&_lock);
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}
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void * __attribute__((used)) __wrap_calloc(size_t nmemb, size_t size)
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{
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uinttxtptr_t pc;
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if (IS_USED(MODULE_MALLOC_TRACING)) {
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pc = cpu_get_caller_pc();
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}
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/* some c libs don't perform proper overflow check (e.g. newlib < 4.0.0). Hence, we
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* just implement calloc on top of malloc ourselves. In addition to ensuring proper
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* overflow checks, this likely saves a bit of ROM */
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size_t total_size;
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if (__builtin_mul_overflow(nmemb, size, &total_size)) {
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if (IS_USED(MODULE_MALLOC_TRACING)) {
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printf("calloc(%u, %u) @ 0x%" PRIxTXTPTR " overflowed\n",
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(unsigned)nmemb, (unsigned)size, pc);
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}
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return NULL;
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}
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mutex_lock(&_lock);
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void *res = __real_malloc(total_size);
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mutex_unlock(&_lock);
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if (res) {
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memset(res, 0, total_size);
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}
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if (IS_USED(MODULE_MALLOC_TRACING)) {
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printf("calloc(%u, %u) @ 0x%" PRIxTXTPTR " returned %p\n",
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(unsigned)nmemb, (unsigned)size, pc, res);
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}
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return res;
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}
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void * __attribute__((used))__wrap_realloc(void *ptr, size_t size)
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{
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uinttxtptr_t pc;
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if (IS_USED(MODULE_MALLOC_TRACING)) {
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pc = cpu_get_caller_pc();
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}
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assert(!irq_is_in());
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mutex_lock(&_lock);
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void *new = __real_realloc(ptr, size);
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mutex_unlock(&_lock);
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if (IS_USED(MODULE_MALLOC_TRACING)) {
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printf("realloc(%p, %u) @0x%" PRIxTXTPTR " returned %p\n",
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ptr, (unsigned)size, pc, new);
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}
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return new;
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}
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/** @} */
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