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>
78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/** @file
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Macros to work around lack of Apple support for LDR register, =expr
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Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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Copyright (c) 2011-2012, 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_LIB_H__
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#define __MACRO_IO_LIB_H__
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#if defined(__APPLE__)
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//
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// ldr reg, =expr does not work with current Apple tool chain. So do the work our selves
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//
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// load _Reg with _Data
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#define LoadConstantToReg(_Data, _Reg) \
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ldr _Reg, [pc, #0] ; \
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b 1f ; \
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.long (_Data) ; \
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1:
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#elif defined (__GNUC__)
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#define LoadConstantToReg(Data, Reg) \
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ldr Reg, =Data
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#else
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//
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// Use ARM assembly macros, form armasam
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//
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// Less magic in the macros if ldr reg, =expr works
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//
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// load _Reg with _Data
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#define LoadConstantToReg(Data, Reg) LoadConstantToRegMacro Data, Reg
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#endif
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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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movw Reg, #(Val) & 0xffff ; \
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movt Reg, #(Val) >> 16
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#define ADRL(Reg, Sym) \
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movw Reg, #:lower16:(Sym) - (. + 16) ; \
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movt Reg, #:upper16:(Sym) - (. + 12) ; \
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add Reg, Reg, pc
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#define LDRL(Reg, Sym) \
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movw Reg, #:lower16:(Sym) - (. + 16) ; \
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movt Reg, #:upper16:(Sym) - (. + 12) ; \
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ldr Reg, [pc, Reg]
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#endif
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