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