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The kernel currently clears the tag bits (i.e. bits 56-63) in the fault address exposed via siginfo.si_addr and sigcontext.fault_address. However, the tag bits may be needed by tools in order to accurately diagnose memory errors, such as HWASan [1] or future tools based on the Memory Tagging Extension (MTE). Expose these bits via the arch_untagged_si_addr mechanism, so that they are only exposed to signal handlers with the SA_EXPOSE_TAGBITS flag set. [1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html Signed-off-by: Peter Collingbourne <pcc@google.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://linux-review.googlesource.com/id/Ia8876bad8c798e0a32df7c2ce1256c4771c81446 Link: https://lore.kernel.org/r/0010296597784267472fa13b39f8238d87a72cf8.1605904350.git.pcc@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Based on arch/arm/include/asm/exception.h
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*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_EXCEPTION_H
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#define __ASM_EXCEPTION_H
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#include <asm/esr.h>
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#include <asm/kprobes.h>
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#include <asm/ptrace.h>
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#include <linux/interrupt.h>
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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#define __exception_irq_entry __irq_entry
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#else
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#define __exception_irq_entry __kprobes
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#endif
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static inline u32 disr_to_esr(u64 disr)
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{
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unsigned int esr = ESR_ELx_EC_SERROR << ESR_ELx_EC_SHIFT;
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if ((disr & DISR_EL1_IDS) == 0)
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esr |= (disr & DISR_EL1_ESR_MASK);
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else
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esr |= (disr & ESR_ELx_ISS_MASK);
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return esr;
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}
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asmlinkage void enter_from_user_mode(void);
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void do_mem_abort(unsigned long far, unsigned int esr, struct pt_regs *regs);
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void do_undefinstr(struct pt_regs *regs);
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void do_bti(struct pt_regs *regs);
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asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr);
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void do_debug_exception(unsigned long addr_if_watchpoint, unsigned int esr,
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struct pt_regs *regs);
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void do_fpsimd_acc(unsigned int esr, struct pt_regs *regs);
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void do_sve_acc(unsigned int esr, struct pt_regs *regs);
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void do_fpsimd_exc(unsigned int esr, struct pt_regs *regs);
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void do_sysinstr(unsigned int esr, struct pt_regs *regs);
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void do_sp_pc_abort(unsigned long addr, unsigned int esr, struct pt_regs *regs);
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void bad_el0_sync(struct pt_regs *regs, int reason, unsigned int esr);
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void do_cp15instr(unsigned int esr, struct pt_regs *regs);
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void do_el0_svc(struct pt_regs *regs);
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void do_el0_svc_compat(struct pt_regs *regs);
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void do_ptrauth_fault(struct pt_regs *regs, unsigned int esr);
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#endif /* __ASM_EXCEPTION_H */
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