05a68e892e
This is a s390 port of commit 548acf19234d ("x86/mm: Expand the
exception table logic to allow new handling options"), which is needed
for implementing BPF_PROBE_MEM on s390.
The new handler field is made 64-bit in order to allow pointing from
dynamically allocated entries to handlers in kernel text. Unlike on x86,
NULL is used instead of ex_handler_default. This is because exception
tables are used by boot/text_dma.S, and it would be a pain to preserve
ex_handler_default.
The new infrastructure is ignored in early_pgm_check_handler, since
there is no pt_regs.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
29 lines
721 B
C
29 lines
721 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_LINKAGE_H
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#define __ASM_LINKAGE_H
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#include <asm/asm-const.h>
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#include <linux/stringify.h>
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#define __ALIGN .align 4, 0x07
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#define __ALIGN_STR __stringify(__ALIGN)
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/*
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* Helper macro for exception table entries
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*/
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#define __EX_TABLE(_section, _fault, _target) \
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stringify_in_c(.section _section,"a";) \
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stringify_in_c(.align 8;) \
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stringify_in_c(.long (_fault) - .;) \
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stringify_in_c(.long (_target) - .;) \
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stringify_in_c(.quad 0;) \
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stringify_in_c(.previous)
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#define EX_TABLE(_fault, _target) \
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__EX_TABLE(__ex_table, _fault, _target)
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#define EX_TABLE_DMA(_fault, _target) \
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__EX_TABLE(.dma.ex_table, _fault, _target)
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#endif
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