mirror of https://github.com/acidanthera/audk.git
111 lines
3.1 KiB
ArmAsm
111 lines
3.1 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php.
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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# Module Name:
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#
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# SwitchStack.S
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#
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# Abstract:
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#
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# Routine Description:
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#
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# Routine for switching stacks with 3 parameters EFI ABI
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# Convert UNIX to EFI ABI
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#
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# Arguments:
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#
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# (rdi) EntryPoint - Entry point with new stack.
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# (rsi) Context1 - Parameter1 for entry point. (rcx)
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# (rdx) Context2 - Parameter2 for entry point. (rdx)
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# (rcx) Context3 - Parameter3 for entry point. (r8)
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# (r8) NewStack - The pointer to new stack.
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#
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# Returns:
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#
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# None
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#
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#------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(PeiSwitchStacks)
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ASM_PFX(PeiSwitchStacks):
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// movq %rdx, %rdx
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movq %r8, %rsp
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movq %rdi, %rax
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movq %rsi, %rcx
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movq %rcx, %r8
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#
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# Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
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# in case the callee wishes to spill them.
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#
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subq $40, %rsp // 32-byte shadow space plus alignment pad
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call *%rax
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#------------------------------------------------------------------------------
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# Routine Description:
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#
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# Routine for switching stacks with 3 parameters UNIX ABI
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#
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# Arguments:
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#
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# (rdi) EntryPoint - Entry point with new stack.
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# (rsi) Context1 - Parameter1 for entry point.
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# (rdx) Context2 - Parameter2 for entry point.
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# (rcx) Context3 - Parameter3 for entry point.
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# (r8) NewStack - The pointer to new stack.
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#
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# Returns:
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#
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# None
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#
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#------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(UnixPeiSwitchStacks)
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ASM_PFX(UnixPeiSwitchStacks):
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mov %rdi, %rax
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mov %rsi, %rdi
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mov %rdx, %rsi
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mov %rcx, %rdx
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mov %r8, %rsp
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#
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# Reserve space for redzone on the stack,
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# in case the callee wishes to spill them.
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#
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lea -0x80(%rsp), %rsp
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call *%rax
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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, // Rcx, Rdi
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# UINT32 PermenentMemoryBase // Rdx, Rsi
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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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mov %rsp, %rax
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sub %rdi, %rax
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add %rsi, %rax
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mov (%rip), %r10
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mov %r10, (%rax)
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ret
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