97f98500c1
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10987 6f19259b-4bc3-4df7-8a09-765794883524
60 lines
1.6 KiB
ArmAsm
60 lines
1.6 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php.
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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# Module Name:
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#
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# Alloca.S
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#
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# Abstract:
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#
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# Implementation for allocation of automatically reclaimed memory, which is
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# used to allocate space off the runtime stack.
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# (NOTE: There is a assumption in this code that the page size equal to 4K)
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#
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#------------------------------------------------------------------------------
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.686:
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.code:
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ASM_GLOBAL ASM_PFX(_alloca)
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#------------------------------------------------------------------------------
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#
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# void __cdecl _alloca (unsigned size)
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#
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#------------------------------------------------------------------------------
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ASM_PFX(_alloca):
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pushl %ecx
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cmpl $0x1000, %eax
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leal 8(%esp), %ecx
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jb LastPage
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ProbePages:
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subl $0x1000, %ecx
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subl $0x1000, %eax
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testl %eax, 0(%ecx)
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cmpl $0x1000, %eax
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jae ProbePages
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LastPage:
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subl %eax, %ecx
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movl %esp, %eax
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testl %eax, 0(%ecx)
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movl %ecx, %esp
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movl 0(%eax), %ecx
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movl 4(%eax), %eax
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pushl %eax
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ret
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