| 1 |
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| 2 | #ifndef _ARCH_POWERPC_EXTABLE_H
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| 3 | #define _ARCH_POWERPC_EXTABLE_H
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| 4 |
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| 5 | |
| 6 | * The exception table consists of pairs of relative addresses: the first is
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| 7 | * the address of an instruction that is allowed to fault, and the second is
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| 8 | * the address at which the program should continue. No registers are
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| 9 | * modified, so it is entirely up to the continuation code to figure out what
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| 10 | * to do.
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| 11 | *
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| 12 | * All the routines below use bits of fixup code that are out of line with the
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| 13 | * main instruction path. This means when everything is well, we don't even
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| 14 | * have to jump over them. Further, they do not intrude on our cache or tlb
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| 15 | * entries.
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| 16 |
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| 17 |
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| 18 | #define ARCH_HAS_RELATIVE_EXTABLE
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| 19 |
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| 20 | #ifndef __ASSEMBLER__
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| 21 |
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| 22 | struct exception_table_entry {
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| 23 | int insn;
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| 24 | int fixup;
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| 25 | };
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| 26 |
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| 27 | static inline unsigned long extable_fixup(const struct exception_table_entry *x)
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| 28 | {
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| 29 | return (unsigned long)&x->fixup + x->fixup;
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| 30 | }
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| 31 |
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| 32 | #endif
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| 33 |
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| 34 | |
| 35 | * Helper macro for exception table entries
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| 36 |
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| 37 | #define EX_TABLE(_fault, _target) \
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| 38 | stringify_in_c(.section __ex_table,"a";)\
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| 39 | stringify_in_c(.balign 4;) \
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| 40 | stringify_in_c(.long (_fault) - . ;) \
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| 41 | stringify_in_c(.long (_target) - . ;) \
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| 42 | stringify_in_c(.previous)
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| 43 |
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| 44 | #endif
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