54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
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/****************************************************************
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* *
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* Copyright 2001, 2009 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "stringpool.h"
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#include "stp_parms.h"
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#include "mem_access.h"
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GBLREF spdesc stringpool;
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OS_PAGE_SIZE_DECLARE
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static unsigned char *lasttop = 0;
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void stp_init(unsigned int size)
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{
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unsigned char *na_page[2];
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if (lasttop != 0)
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{
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na_page[0] = na_page[1]
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= stringpool.top + SIZEOF(char *);
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reset_access(na_page, stringpool.prvprt);
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}
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/* Allocate the size requested plus one longword so that loops that index through the stringpool can go one
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iteration beyond the end of the stringpool without running off the end of the allocated memory region.
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After the requested size plus the extra longword, allocate an additional region two machine pages int4 in
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order to ensure that this additional region contains at least one aligned machine page; mark that aligned
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page non-accessible so that memory accesses too far beyond the intended end of the stringpool (caused by
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"runaway" loops, for example) will cause ACCVIO errors.
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*/
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stringpool.base = stringpool.free
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= (unsigned char *)malloc(size + SIZEOF(char *) + 2 * OS_PAGE_SIZE);
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na_page[0] = na_page[1]
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= (unsigned char *)
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((((UINTPTR_T)stringpool.base + size + SIZEOF(char *) + 2 * OS_PAGE_SIZE) & ~(OS_PAGE_SIZE - 1)) - OS_PAGE_SIZE);
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stringpool.lasttop = lasttop;
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lasttop = stringpool.top
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= na_page[0] - SIZEOF(char *);
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set_noaccess (na_page, &stringpool.prvprt);
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return;
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}
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