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45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
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#include "ValidPointer.h"
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ValidPointer *g_validPointer = NULL;
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ValidPointer::ValidPointer(void *firststackaddr) {
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m_stackStart = firststackaddr;
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if(g_validPointer) {
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log(LOG_LOGIC, "init: Second instantiation of ValidPointer, this is a bug\n");
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char *xx = NULL; *xx = 0;
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}
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g_validPointer = this;
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}
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// Wonky pointer tricks, read the ELF spec before you
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// monkey with this.
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int ValidPointer::isValidPointer(void *ptr) {
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uint32_t stackvar = 0;
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extern void *__FRAME_BEGIN__;
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extern void *_end;
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if(ptr < __FRAME_BEGIN__) return(POINTER_INVALID);
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if(ptr < _end) return(POINTER_IN_DATA);
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// Sadly, this isn't definitive, but it's a good guess
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if((uint32_t)ptr < ((uint32_t)&_end + g_mem.getMaxMem()))
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return(POINTER_IN_HEAP);
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if(ptr < m_stackStart && ptr > &stackvar) return(POINTER_IN_STACK);
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return(POINTER_INVALID);
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}
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extern "C" {
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int isValidPointer(void *ptr) {
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#if 0
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// Disabled, it returns invalid on some valid pointers.
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if(!g_validPointer) {
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log(LOG_WARN,
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"init: Pointer Validation not set up yet, this is a bug.\n");
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return(POINTER_INVALID);
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}
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return(g_validPointer->isValidPointer(ptr));
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#else // 0
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return(true);
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#endif // 0
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}
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} // extern "C"
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