]>
Commit | Line | Data |
---|---|---|
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 |