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60 lines
1.3 KiB
ArmAsm
60 lines
1.3 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* PURPOSE: Stack checker
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* PROGRAMERS: KJK::Hyperion <noog@libero.it>
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* Richard Henderson <rth@redhat.com>
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* Kai Tietz <kai.tietz@onevision.com>
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* Timo Kreuzer <timo.kreuzer@reactos.org>
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*/
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#include <asm.inc>
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#include <ks386.inc>
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#define PAGE_SIZE 4096
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PUBLIC ___chkstk_ms
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.code
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/* Special version, that does only probe and not allocate */
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___chkstk_ms:
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/* EAX = size to be allocated */
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/* save the ECX and EAX register */
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push ecx
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push eax
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/* ECX = top of the previous stack frame */
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lea ecx, [esp + 12]
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/* probe the desired memory, page by page */
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cmp eax, PAGE_SIZE
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jl .l_LessThanAPage
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.l_MoreThanAPage:
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/* raise the top of the stack by a page and probe */
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sub ecx, PAGE_SIZE
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test [ecx], eax
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/* loop if still more than a page must be probed */
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sub eax, PAGE_SIZE
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cmp eax, PAGE_SIZE
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jge .l_MoreThanAPage
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.l_LessThanAPage:
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/* raise the top of the stack by EAX bytes (size % 4096) and probe */
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sub ecx, eax
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test [ecx], eax
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/* restore ECX and EAX */
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pop eax
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pop ecx
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/* return */
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ret
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/* EOF */
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END
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