d2d0e27c76
This introduces the ASM_FUNC() macro to annotate function entry points in assembler files. This allows us to add additional metadata that marks a function entry point as a function, and allows us to emit a .section directive for each function, which makes it possible for the linker to drop unreferenced code. In addition, introduce a couple of utility macros that we can use to clean up the code. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Eugene Cohen <eugene@hp.com> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/** @file
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Macros to work around lack of Clang support for LDR register, =expr
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Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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Portions copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
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Copyright (c) 2016, Linaro Ltd. 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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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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#ifndef __MACRO_IO_LIBV8_H__
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#define __MACRO_IO_LIBV8_H__
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// CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1
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// This only selects between EL1 and EL2, else we die.
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// Provide the Macro with a safe temp xreg to use.
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#define EL1_OR_EL2(SAFE_XREG) \
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mrs SAFE_XREG, CurrentEL ;\
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cmp SAFE_XREG, #0x8 ;\
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b.gt . ;\
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b.eq 2f ;\
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cbnz SAFE_XREG, 1f ;\
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b . ;// We should never get here
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// CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1
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// This only selects between EL1 and EL2 and EL3, else we die.
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// Provide the Macro with a safe temp xreg to use.
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#define EL1_OR_EL2_OR_EL3(SAFE_XREG) \
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mrs SAFE_XREG, CurrentEL ;\
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cmp SAFE_XREG, #0x8 ;\
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b.gt 3f ;\
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b.eq 2f ;\
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cbnz SAFE_XREG, 1f ;\
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b . ;// We should never get here
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#if defined(__clang__)
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// load x0 with _Data
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#define LoadConstant(_Data) \
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ldr x0, 1f ; \
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b 2f ; \
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.align(8) ; \
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1: \
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.8byte (_Data) ; \
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2:
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// load _Reg with _Data
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#define LoadConstantToReg(_Data, _Reg) \
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ldr _Reg, 1f ; \
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b 2f ; \
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.align(8) ; \
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1: \
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.8byte (_Data) ; \
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2:
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#elif defined (__GNUC__)
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#define LoadConstant(Data) \
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ldr x0, =Data
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#define LoadConstantToReg(Data, Reg) \
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ldr Reg, =Data
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#endif // __GNUC__
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#define _ASM_FUNC(Name, Section) \
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.global Name ; \
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.section #Section, "ax" ; \
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.type Name, %function ; \
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Name:
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#define ASM_FUNC(Name) _ASM_FUNC(ASM_PFX(Name), .text. ## Name)
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#define MOV32(Reg, Val) \
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movz Reg, (Val) >> 16, lsl #16 ; \
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movk Reg, (Val) & 0xffff
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#define MOV64(Reg, Val) \
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movz Reg, (Val) >> 48, lsl #48 ; \
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movk Reg, ((Val) >> 32) & 0xffff, lsl #32 ; \
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movk Reg, ((Val) >> 16) & 0xffff, lsl #16 ; \
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movk Reg, (Val) & 0xffff
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#endif // __MACRO_IO_LIBV8_H__
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