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76 lines
2.0 KiB
76 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __S390_EXTABLE_H |
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#define __S390_EXTABLE_H |
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#include <asm/ptrace.h> |
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#include <linux/compiler.h> |
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/* |
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* The exception table consists of three addresses: |
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* |
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* - Address of an instruction that is allowed to fault. |
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* - Address at which the program should continue. |
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* - Optional address of handler that takes pt_regs * argument and runs in |
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* interrupt context. |
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* |
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* No registers are modified, so it is entirely up to the continuation code |
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* to figure out what to do. |
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* |
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* All the routines below use bits of fixup code that are out of line |
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* with the main instruction path. This means when everything is well, |
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* we don't even have to jump over them. Further, they do not intrude |
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* on our cache or tlb entries. |
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*/ |
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struct exception_table_entry |
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{ |
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int insn, fixup; |
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long handler; |
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}; |
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extern struct exception_table_entry *__start_dma_ex_table; |
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extern struct exception_table_entry *__stop_dma_ex_table; |
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const struct exception_table_entry *s390_search_extables(unsigned long addr); |
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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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typedef bool (*ex_handler_t)(const struct exception_table_entry *, |
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struct pt_regs *); |
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static inline ex_handler_t |
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ex_fixup_handler(const struct exception_table_entry *x) |
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{ |
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if (likely(!x->handler)) |
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return NULL; |
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return (ex_handler_t)((unsigned long)&x->handler + x->handler); |
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} |
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static inline bool ex_handle(const struct exception_table_entry *x, |
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struct pt_regs *regs) |
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{ |
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ex_handler_t handler = ex_fixup_handler(x); |
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if (unlikely(handler)) |
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return handler(x, regs); |
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regs->psw.addr = extable_fixup(x); |
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return true; |
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} |
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#define ARCH_HAS_RELATIVE_EXTABLE |
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static inline void swap_ex_entry_fixup(struct exception_table_entry *a, |
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struct exception_table_entry *b, |
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struct exception_table_entry tmp, |
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int delta) |
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{ |
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a->fixup = b->fixup + delta; |
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b->fixup = tmp.fixup - delta; |
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a->handler = b->handler + delta; |
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b->handler = tmp.handler - delta; |
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} |
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#endif
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