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https://github.com/CloverHackyColor/CloverBootloader.git
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53 lines
1.7 KiB
ArmAsm
53 lines
1.7 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 2 parameters
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#
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# Arguments:
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#
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# (rcx) EntryPoint - Entry point with new stack.
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# (rdx) Context1 - Parameter1 for entry point.
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# (r8) Context2 - Parameter2 for entry point.
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# (r9) 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(InternalSwitchStack)
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ASM_PFX(InternalSwitchStack):
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pushq %rbp
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movq %rsp, %rbp
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mov %rcx, %rax // Shift registers for new call
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mov %rdx, %rcx
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mov %r8, %rdx
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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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lea -0x20(%r9), %rsp
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pushq $0 // stop gdb stack unwind
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jmp *%rax // call EntryPoint ()
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