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50 lines
1.2 KiB
50 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/extable.h> |
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#include <linux/errno.h> |
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#include <linux/panic.h> |
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#include <asm/asm-extable.h> |
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#include <asm/extable.h> |
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const struct exception_table_entry *s390_search_extables(unsigned long addr) |
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{ |
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const struct exception_table_entry *fixup; |
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size_t num; |
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fixup = search_exception_tables(addr); |
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if (fixup) |
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return fixup; |
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num = __stop_amode31_ex_table - __start_amode31_ex_table; |
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return search_extable(__start_amode31_ex_table, num, addr); |
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} |
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static bool ex_handler_fixup(const struct exception_table_entry *ex, struct pt_regs *regs) |
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{ |
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regs->psw.addr = extable_fixup(ex); |
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return true; |
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} |
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static bool ex_handler_uaccess(const struct exception_table_entry *ex, struct pt_regs *regs) |
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{ |
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regs->gprs[ex->data] = -EFAULT; |
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regs->psw.addr = extable_fixup(ex); |
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return true; |
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} |
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bool fixup_exception(struct pt_regs *regs) |
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{ |
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const struct exception_table_entry *ex; |
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ex = s390_search_extables(instruction_pointer(regs)); |
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if (!ex) |
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return false; |
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switch (ex->type) { |
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case EX_TYPE_FIXUP: |
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return ex_handler_fixup(ex, regs); |
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case EX_TYPE_BPF: |
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return ex_handler_bpf(ex, regs); |
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case EX_TYPE_UACCESS: |
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return ex_handler_uaccess(ex, regs); |
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} |
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panic("invalid exception table entry"); |
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}
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