| #------------------------------------------------------------------------------ | |
| # | |
| # Copyright (c) 2007, Intel Corporation. All rights reserved.<BR> | |
| # SPDX-License-Identifier: BSD-2-Clause-Patent | |
| # | |
| # Module Name: | |
| # | |
| # Stack.asm | |
| # | |
| # Abstract: | |
| # | |
| # Switch the stack from temporary memory to permanent memory. | |
| # | |
| #------------------------------------------------------------------------------ | |
| .text | |
| //------------------------------------------------------------------------------ | |
| // VOID | |
| // EFIAPI | |
| // SecSwitchStack ( | |
| // UINT32 TemporaryMemoryBase, | |
| // UINT32 PermenentMemoryBase | |
| // )// | |
| //------------------------------------------------------------------------------ | |
| ASM_GLOBAL ASM_PFX(SecSwitchStack) | |
| ASM_PFX(SecSwitchStack): | |
| # | |
| # Save three register: eax, ebx, ecx | |
| # | |
| push %eax | |
| push %ebx | |
| push %ecx | |
| push %edx | |
| # | |
| # !!CAUTION!! this function address's is pushed into stack after | |
| # migration of whole temporary memory, so need save it to permanent | |
| # memory at first! | |
| # | |
| movl 20(%esp), %ebx # Save the first parameter | |
| movl 24(%esp), %ecx # Save the second parameter | |
| # | |
| # Save this function's return address into permanent memory at first. | |
| # Then, Fixup the esp point to permanent memory | |
| # | |
| movl %esp, %eax | |
| subl %ebx, %eax | |
| addl %ecx, %eax | |
| movl (%esp), %edx # copy pushed register's value to permanent memory | |
| movl %edx, (%eax) | |
| movl 4(%esp), %edx | |
| movl %edx, 4(%eax) | |
| movl 8(%esp), %edx | |
| movl %edx, 8(%eax) | |
| movl 12(%esp), %edx | |
| movl %edx, 12(%eax) | |
| movl 16(%esp), %edx | |
| movl %edx, 16(%eax) | |
| movl %eax, %esp # From now, esp is pointed to permanent memory | |
| # | |
| # Fixup the ebp point to permanent memory | |
| # | |
| #ifndef __APPLE__ | |
| movl %ebp, %eax | |
| subl %ebx, %eax | |
| addl %ecx, %eax | |
| movl %eax, %ebp # From now, ebp is pointed to permanent memory | |
| # | |
| # Fixup callee's ebp point for PeiDispatch | |
| # | |
| movl (%ebp), %eax | |
| subl %ebx, %eax | |
| addl %ecx, %eax | |
| movl %eax, (%ebp) # From now, Temporary's PPI caller's stack is in permanent memory | |
| #endif | |
| pop %edx | |
| pop %ecx | |
| pop %ebx | |
| pop %eax | |
| ret | |