projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 97f98500 HT |
1 | #------------------------------------------------------------------------------\r |
| 2 | #\r | |
| 3 | # Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>\r | |
| 4 | # This program and the accompanying materials\r | |
| 5 | # are licensed and made available under the terms and conditions of the BSD License\r | |
| 6 | # which accompanies this distribution. The full text of the license may be found at\r | |
| 7 | # http://opensource.org/licenses/bsd-license.php.\r | |
| 8 | #\r | |
| 9 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 10 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 11 | #\r | |
| 12 | # Module Name:\r | |
| 13 | #\r | |
| 14 | # Alloca.S\r | |
| 15 | #\r | |
| 16 | # Abstract:\r | |
| 17 | #\r | |
| 18 | # Implementation for allocation of automatically reclaimed memory, which is\r | |
| 19 | # used to allocate space off the runtime stack.\r | |
| 20 | # (NOTE: There is a assumption in this code that the page size equal to 4K)\r | |
| 21 | #\r | |
| 22 | #------------------------------------------------------------------------------\r | |
| 23 | \r | |
| 24 | \r | |
| 25 | .686:\r | |
| 26 | .code:\r | |
| 27 | \r | |
| 28 | ASM_GLOBAL ASM_PFX(_alloca)\r | |
| 29 | \r | |
| 30 | #------------------------------------------------------------------------------\r | |
| 31 | #\r | |
| 32 | # void __cdecl _alloca (unsigned size)\r | |
| 33 | #\r | |
| 34 | #------------------------------------------------------------------------------\r | |
| 35 | ASM_PFX(_alloca):\r | |
| 36 | \r | |
| 37 | pushl %ecx\r | |
| 38 | cmpl $0x1000, %eax\r | |
| 39 | leal 8(%esp), %ecx\r | |
| 40 | jb LastPage\r | |
| 41 | \r | |
| 42 | ProbePages:\r | |
| 43 | subl $0x1000, %ecx\r | |
| 44 | subl $0x1000, %eax\r | |
| 45 | testl %eax, 0(%ecx)\r | |
| 46 | cmpl $0x1000, %eax\r | |
| 47 | jae ProbePages\r | |
| 48 | \r | |
| 49 | LastPage:\r | |
| 50 | subl %eax, %ecx\r | |
| 51 | movl %esp, %eax\r | |
| 52 | testl %eax, 0(%ecx)\r | |
| 53 | \r | |
| 54 | movl %ecx, %esp\r | |
| 55 | movl 0(%eax), %ecx\r | |
| 56 | movl 4(%eax), %eax\r | |
| 57 | pushl %eax\r | |
| 58 | \r | |
| 59 | ret\r |