27 lines
573 B
C++
27 lines
573 B
C++
namespace factor {
|
|
|
|
inline cell align_page(cell a) { return align(a, getpagesize()); }
|
|
|
|
/* segments set up guard pages to check for under/overflow.
|
|
size must be a multiple of the page size */
|
|
struct segment {
|
|
cell start;
|
|
cell size;
|
|
cell end;
|
|
|
|
segment(cell size, bool executable_p);
|
|
~segment();
|
|
|
|
bool underflow_p(cell addr) {
|
|
return (addr >= start - getpagesize() && addr < start);
|
|
}
|
|
|
|
bool overflow_p(cell addr) {
|
|
return (addr >= end && addr < end + getpagesize());
|
|
}
|
|
|
|
bool in_segment_p(cell addr) { return (addr >= start && addr < end); }
|
|
};
|
|
|
|
}
|