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With the current ASM_FUNC() macro, there is no good way to declare an alignment constraint for a function. As ASM_FUNC() switches sections, declaring the constraint before the macro invocation applies it to the current location in the previous section. Declaring the constraint after the macro invocation lets the function label point to the location prior to alignment. Depending on toolchain behaviour, this may cause the label to point to alignment padding preceding the actual function definition. To address these issues, introduce the ASM_FUNC_ALIGN() macro, which declares the alignment constraint right before the function label. Signed-off-by: Marvin Häuser <mhaeuser@posteo.de> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
68 lines
2.4 KiB
C
68 lines
2.4 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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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef ASM_MACRO_IO_LIBV8_H_
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#define ASM_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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#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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AARCH64_BTI(c)
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#define _ASM_FUNC_ALIGN(Name, Section, Align) \
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.global Name ; \
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.section #Section, "ax" ; \
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.type Name, %function ; \
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.balign Align ; \
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Name: ; \
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AARCH64_BTI(c)
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#define ASM_FUNC(Name) _ASM_FUNC(ASM_PFX(Name), .text. ## Name)
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#define ASM_FUNC_ALIGN(Name, Align) \
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_ASM_FUNC_ALIGN(ASM_PFX(Name), .text. ## Name, Align)
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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 // ASM_MACRO_IO_LIBV8_H_
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