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Dmitry AntipovandAndrew Morton
a354b8de9a
Add riscv32-specific '__ashldi3()', '__ashrdi3()', and '__lshrdi3()'. Initially it was intended to fix the following link error observed when building EFI-enabled kernel with CONFIG_EFI_STUB=y and CONFIG_EFI_GENERIC_STUB=y: riscv32-linux-gnu-ld: ./drivers/firmware/efi/libstub/lib-cmdline.stub.o: in function `__efistub_.L49': __efistub_cmdline.c:(.init.text+0x1f2): undefined reference to `__efistub___ashldi3' riscv32-linux-gnu-ld: __efistub_cmdline.c:(.init.text+0x202): undefined reference to `__efistub___lshrdi3' Reported at [1] trying to build https://patchew.org/linux/20260212164413.889625-1-dmantipov@yandex.ru, tested with 'qemu-system-riscv32 -M virt' only. Link: https://lore.kernel.org/20260519172259.908980-7-dmantipov@yandex.ru Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru> Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202603041925.KLKqpK6N-lkp@intel.com [1] Suggested-by: Ard Biesheuvel <ardb@kernel.org> Tested-by: Charlie Jenkins <thecharlesjenkins@gmail.com> Assisted-by: Gemini:gemini-3.1-pro-preview sashiko Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Andriy Shevchenko <andriy.shevchenko@intel.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2020 Western Digital Corporation or its affiliates.
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* Linker script variables to be set after section resolution, as
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* ld.lld does not like variables assigned before SECTIONS is processed.
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* Based on arch/arm64/kernel/image-vars.h
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*/
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#ifndef __RISCV_KERNEL_IMAGE_VARS_H
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#define __RISCV_KERNEL_IMAGE_VARS_H
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#ifndef LINKER_SCRIPT
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#error This file should only be included in vmlinux.lds.S
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#endif
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#ifdef CONFIG_EFI
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/*
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* The EFI stub has its own symbol namespace prefixed by __efistub_, to
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* isolate it from the kernel proper. The following symbols are legally
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* accessed by the stub, so provide some aliases to make them accessible.
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* Only include data symbols here, or text symbols of functions that are
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* guaranteed to be safe when executed at another offset than they were
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* linked at. The routines below are all implemented in assembler in a
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* position independent manner
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*/
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__efistub__start = _start;
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__efistub__start_kernel = _start_kernel;
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__efistub__end = _end;
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__efistub__edata = _edata;
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__efistub___init_text_end = __init_text_end;
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#if defined(CONFIG_EFI_EARLYCON) || defined(CONFIG_SYSFB)
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__efistub_sysfb_primary_display = sysfb_primary_display;
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#endif
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/*
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* These double-word integer shifts are used by the library code, and
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* the first two of them are required to link EFI stub. Note __ashrdi3()
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* is not actually used by the stub but this may change in the future.
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*/
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PROVIDE(__efistub___lshrdi3 = __lshrdi3);
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PROVIDE(__efistub___ashldi3 = __ashldi3);
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PROVIDE(__efistub___ashrdi3 = __ashrdi3);
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#endif
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#endif /* __RISCV_KERNEL_IMAGE_VARS_H */
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