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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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3d98ffbffb
Anton's commit enabling the use of the lwsync fixup mechanism on 64-bit breaks modules. The lwsync fixup section uses .long instead of the FTR_ENTRY_OFFSET macro used by other fixups sections, and thus will generate 32-bit relocations that our module loader cannot resolve. This changes it to use the same type as other feature sections. Note however that we might want to consider using 32-bit for all the feature fixup offsets and add support for R_PPC_REL32 to module_64.c instead as that would reduce the size of the kernel image. I'll leave that as an exercise for the reader for now... Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
172 lines
6.2 KiB
C
172 lines
6.2 KiB
C
#ifndef __ASM_POWERPC_FEATURE_FIXUPS_H
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#define __ASM_POWERPC_FEATURE_FIXUPS_H
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/*
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* Feature section common macros
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*
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* Note that the entries now contain offsets between the table entry
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* and the code rather than absolute code pointers in order to be
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* useable with the vdso shared library. There is also an assumption
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* that values will be negative, that is, the fixup table has to be
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* located after the code it fixes up.
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*/
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#if defined(CONFIG_PPC64) && !defined(__powerpc64__)
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/* 64 bits kernel, 32 bits code (ie. vdso32) */
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#define FTR_ENTRY_LONG .llong
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#define FTR_ENTRY_OFFSET .long 0xffffffff; .long
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#elif defined(CONFIG_PPC64)
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#define FTR_ENTRY_LONG .llong
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#define FTR_ENTRY_OFFSET .llong
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#else
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#define FTR_ENTRY_LONG .long
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#define FTR_ENTRY_OFFSET .long
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#endif
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#define START_FTR_SECTION(label) label##1:
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#define FTR_SECTION_ELSE_NESTED(label) \
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label##2: \
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.pushsection __ftr_alt_##label,"a"; \
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.align 2; \
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label##3:
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#define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect) \
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label##4: \
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.popsection; \
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.pushsection sect,"a"; \
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.align 3; \
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label##5: \
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FTR_ENTRY_LONG msk; \
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FTR_ENTRY_LONG val; \
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FTR_ENTRY_OFFSET label##1b-label##5b; \
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FTR_ENTRY_OFFSET label##2b-label##5b; \
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FTR_ENTRY_OFFSET label##3b-label##5b; \
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FTR_ENTRY_OFFSET label##4b-label##5b; \
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.popsection;
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/* CPU feature dependent sections */
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#define BEGIN_FTR_SECTION_NESTED(label) START_FTR_SECTION(label)
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#define BEGIN_FTR_SECTION START_FTR_SECTION(97)
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#define END_FTR_SECTION_NESTED(msk, val, label) \
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FTR_SECTION_ELSE_NESTED(label) \
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MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
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#define END_FTR_SECTION(msk, val) \
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END_FTR_SECTION_NESTED(msk, val, 97)
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#define END_FTR_SECTION_IFSET(msk) END_FTR_SECTION((msk), (msk))
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#define END_FTR_SECTION_IFCLR(msk) END_FTR_SECTION((msk), 0)
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/* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
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#define FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97)
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#define ALT_FTR_SECTION_END_NESTED(msk, val, label) \
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MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
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#define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label) \
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ALT_FTR_SECTION_END_NESTED(msk, msk, label)
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#define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label) \
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ALT_FTR_SECTION_END_NESTED(msk, 0, label)
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#define ALT_FTR_SECTION_END(msk, val) \
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ALT_FTR_SECTION_END_NESTED(msk, val, 97)
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#define ALT_FTR_SECTION_END_IFSET(msk) \
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ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97)
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#define ALT_FTR_SECTION_END_IFCLR(msk) \
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ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
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/* MMU feature dependent sections */
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#define BEGIN_MMU_FTR_SECTION_NESTED(label) START_FTR_SECTION(label)
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#define BEGIN_MMU_FTR_SECTION START_FTR_SECTION(97)
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#define END_MMU_FTR_SECTION_NESTED(msk, val, label) \
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FTR_SECTION_ELSE_NESTED(label) \
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MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
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#define END_MMU_FTR_SECTION(msk, val) \
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END_MMU_FTR_SECTION_NESTED(msk, val, 97)
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#define END_MMU_FTR_SECTION_IFSET(msk) END_MMU_FTR_SECTION((msk), (msk))
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#define END_MMU_FTR_SECTION_IFCLR(msk) END_MMU_FTR_SECTION((msk), 0)
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/* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
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#define MMU_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label)
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#define MMU_FTR_SECTION_ELSE MMU_FTR_SECTION_ELSE_NESTED(97)
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#define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label) \
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MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
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#define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label) \
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ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label)
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#define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label) \
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ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label)
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#define ALT_MMU_FTR_SECTION_END(msk, val) \
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ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97)
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#define ALT_MMU_FTR_SECTION_END_IFSET(msk) \
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ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97)
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#define ALT_MMU_FTR_SECTION_END_IFCLR(msk) \
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ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
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/* Firmware feature dependent sections */
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#define BEGIN_FW_FTR_SECTION_NESTED(label) START_FTR_SECTION(label)
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#define BEGIN_FW_FTR_SECTION START_FTR_SECTION(97)
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#define END_FW_FTR_SECTION_NESTED(msk, val, label) \
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FTR_SECTION_ELSE_NESTED(label) \
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MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
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#define END_FW_FTR_SECTION(msk, val) \
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END_FW_FTR_SECTION_NESTED(msk, val, 97)
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#define END_FW_FTR_SECTION_IFSET(msk) END_FW_FTR_SECTION((msk), (msk))
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#define END_FW_FTR_SECTION_IFCLR(msk) END_FW_FTR_SECTION((msk), 0)
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/* Firmware feature sections with alternatives */
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#define FW_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label)
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#define FW_FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97)
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#define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label) \
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MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
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#define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label) \
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ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label)
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#define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label) \
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ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label)
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#define ALT_FW_FTR_SECTION_END(msk, val) \
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ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97)
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#define ALT_FW_FTR_SECTION_END_IFSET(msk) \
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ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97)
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#define ALT_FW_FTR_SECTION_END_IFCLR(msk) \
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ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
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#ifndef __ASSEMBLY__
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#define ASM_MMU_FTR_IF(section_if, section_else, msk, val) \
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stringify_in_c(BEGIN_MMU_FTR_SECTION) \
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section_if "; " \
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stringify_in_c(MMU_FTR_SECTION_ELSE) \
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section_else "; " \
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stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val)))
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#define ASM_MMU_FTR_IFSET(section_if, section_else, msk) \
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ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk))
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#define ASM_MMU_FTR_IFCLR(section_if, section_else, msk) \
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ASM_MMU_FTR_IF(section_if, section_else, (msk), 0)
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#endif /* __ASSEMBLY__ */
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/* LWSYNC feature sections */
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#define START_LWSYNC_SECTION(label) label##1:
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#define MAKE_LWSYNC_SECTION_ENTRY(label, sect) \
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label##2: \
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.pushsection sect,"a"; \
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.align 2; \
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label##3: \
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FTR_ENTRY_OFFSET label##1b-label##3b; \
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.popsection;
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#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */
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