44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ARCH_POWERPC_EXTABLE_H
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#define _ARCH_POWERPC_EXTABLE_H
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/*
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* The exception table consists of pairs of relative addresses: the first is
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* the address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out what
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* to do.
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*
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* All the routines below use bits of fixup code that are out of line with the
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* main instruction path. This means when everything is well, we don't even
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* have to jump over them. Further, they do not intrude on our cache or tlb
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* entries.
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*/
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#define ARCH_HAS_RELATIVE_EXTABLE
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#ifndef __ASSEMBLY__
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struct exception_table_entry {
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int insn;
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int fixup;
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};
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static inline unsigned long extable_fixup(const struct exception_table_entry *x)
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{
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return (unsigned long)&x->fixup + x->fixup;
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}
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#endif
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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(_fault, _target) \
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stringify_in_c(.section __ex_table,"a";)\
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stringify_in_c(.balign 4;) \
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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(.previous)
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#endif
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