de949fdbcf
Fix various typos in comments and documentation. Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Andrew Fish <afish@apple.com> Cc: Ray Ni <ray.ni@intel.com> Signed-off-by: Antoine Coeur <coeur@gmx.fr> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com> Acked-by: Liming Gao <liming.gao@intel.com> Signed-off-by: Philippe Mathieu-Daude <philmd@redhat.com> Message-Id: <20200207010831.9046-5-philmd@redhat.com>
90 lines
2.3 KiB
ArmAsm
90 lines
2.3 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
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# SPDX-License-Identifier: BSD-2-Clause-Patent
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#
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# Module Name:
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#
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# Stack.asm
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#
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# Abstract:
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#
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# Switch the stack from temporary memory to permanent memory.
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#
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#------------------------------------------------------------------------------
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.text
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//------------------------------------------------------------------------------
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// VOID
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// EFIAPI
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// SecSwitchStack (
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// UINT32 TemporaryMemoryBase,
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// UINT32 PermenentMemoryBase
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// )//
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//------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(SecSwitchStack)
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ASM_PFX(SecSwitchStack):
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#
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# Save three register: eax, ebx, ecx
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#
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push %eax
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push %ebx
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push %ecx
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push %edx
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#
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# !!CAUTION!! this function address's is pushed into stack after
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# migration of whole temporary memory, so need save it to permanent
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# memory at first!
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#
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movl 20(%esp), %ebx # Save the first parameter
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movl 24(%esp), %ecx # Save the second parameter
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#
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# Save this function's return address into permanent memory at first.
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# Then, Fixup the esp point to permanent memory
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#
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movl %esp, %eax
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subl %ebx, %eax
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addl %ecx, %eax
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movl (%esp), %edx # copy pushed register's value to permanent memory
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movl %edx, (%eax)
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movl 4(%esp), %edx
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movl %edx, 4(%eax)
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movl 8(%esp), %edx
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movl %edx, 8(%eax)
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movl 12(%esp), %edx
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movl %edx, 12(%eax)
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movl 16(%esp), %edx
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movl %edx, 16(%eax)
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movl %eax, %esp # From now, esp is pointed to permanent memory
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#
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# Fixup the ebp point to permanent memory
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#
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#ifndef __APPLE__
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movl %ebp, %eax
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subl %ebx, %eax
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addl %ecx, %eax
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movl %eax, %ebp # From now, ebp is pointed to permanent memory
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#
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# Fixup callee's ebp point for PeiDispatch
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#
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movl (%ebp), %eax
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subl %ebx, %eax
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addl %ecx, %eax
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movl %eax, (%ebp) # From now, Temporary's PPI caller's stack is in permanent memory
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#endif
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pop %edx
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pop %ecx
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pop %ebx
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pop %eax
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ret
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