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e1f414b6 | 1 | /** @file\r |
2 | SwitchStack() function for IA-32.\r | |
3 | \r | |
373ade0e | 4 | Copyright (c) 2006 - 2008, Intel Corporation<BR>\r |
e1f414b6 | 5 | All rights reserved. This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
e1f414b6 | 13 | **/\r |
14 | \r | |
47fc17d8 | 15 | #include "BaseLibInternals.h"\r |
f734a10a | 16 | \r |
e1f414b6 | 17 | /**\r |
18 | Transfers control to a function starting with a new stack.\r | |
19 | \r | |
20 | Transfers control to the function specified by EntryPoint using the\r | |
21 | new stack specified by NewStack and passing in the parameters specified\r | |
22 | by Context1 and Context2. Context1 and Context2 are optional and may\r | |
23 | be NULL. The function EntryPoint must never return.\r | |
24 | Marker will be ignored on IA-32, x64, and EBC.\r | |
25 | IPF CPUs expect one additional parameter of type VOID * that specifies\r | |
26 | the new backing store pointer.\r | |
27 | \r | |
28 | If EntryPoint is NULL, then ASSERT().\r | |
29 | If NewStack is NULL, then ASSERT().\r | |
30 | \r | |
31 | @param EntryPoint A pointer to function to call with the new stack.\r | |
32 | @param Context1 A pointer to the context to pass into the EntryPoint\r | |
33 | function.\r | |
34 | @param Context2 A pointer to the context to pass into the EntryPoint\r | |
35 | function.\r | |
36 | @param NewStack A pointer to the new stack to use for the EntryPoint\r | |
37 | function.\r | |
38 | @param Marker VA_LIST marker for the variable argument list.\r | |
39 | \r | |
40 | **/\r | |
41 | VOID\r | |
42 | EFIAPI\r | |
43 | InternalSwitchStack (\r | |
44 | IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
45 | IN VOID *Context1, OPTIONAL\r | |
46 | IN VOID *Context2, OPTIONAL\r | |
47 | IN VOID *NewStack,\r | |
48 | IN VA_LIST Marker\r | |
49 | )\r | |
50 | {\r | |
51 | BASE_LIBRARY_JUMP_BUFFER JumpBuffer;\r | |
52 | \r | |
e1f414b6 | 53 | JumpBuffer.Eip = (UINTN)EntryPoint;\r |
54 | JumpBuffer.Esp = (UINTN)NewStack - sizeof (VOID*);\r | |
55 | JumpBuffer.Esp -= sizeof (Context1) + sizeof (Context2);\r | |
56 | ((VOID**)JumpBuffer.Esp)[1] = Context1;\r | |
57 | ((VOID**)JumpBuffer.Esp)[2] = Context2;\r | |
58 | \r | |
59 | LongJump (&JumpBuffer, (UINTN)-1);\r | |
60 | }\r |