344 lines
7.5 KiB
C
344 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Exception handling code
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*
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* Copyright (C) 2019 ARM Ltd.
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*/
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#include <linux/context_tracking.h>
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#include <linux/ptrace.h>
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#include <linux/thread_info.h>
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#include <asm/cpufeature.h>
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#include <asm/daifflags.h>
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#include <asm/esr.h>
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#include <asm/exception.h>
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#include <asm/kprobes.h>
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#include <asm/mmu.h>
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#include <asm/sysreg.h>
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static void notrace el1_abort(struct pt_regs *regs, unsigned long esr)
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{
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unsigned long far = read_sysreg(far_el1);
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local_daif_inherit(regs);
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far = untagged_addr(far);
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do_mem_abort(far, esr, regs);
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}
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NOKPROBE_SYMBOL(el1_abort);
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static void notrace el1_pc(struct pt_regs *regs, unsigned long esr)
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{
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unsigned long far = read_sysreg(far_el1);
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local_daif_inherit(regs);
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do_sp_pc_abort(far, esr, regs);
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}
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NOKPROBE_SYMBOL(el1_pc);
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static void notrace el1_undef(struct pt_regs *regs)
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{
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local_daif_inherit(regs);
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do_undefinstr(regs);
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}
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NOKPROBE_SYMBOL(el1_undef);
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static void notrace el1_inv(struct pt_regs *regs, unsigned long esr)
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{
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local_daif_inherit(regs);
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bad_mode(regs, 0, esr);
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}
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NOKPROBE_SYMBOL(el1_inv);
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static void notrace el1_dbg(struct pt_regs *regs, unsigned long esr)
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{
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unsigned long far = read_sysreg(far_el1);
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/*
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* The CPU masked interrupts, and we are leaving them masked during
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* do_debug_exception(). Update PMR as if we had called
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* local_daif_mask().
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*/
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if (system_uses_irq_prio_masking())
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gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
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do_debug_exception(far, esr, regs);
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}
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NOKPROBE_SYMBOL(el1_dbg);
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asmlinkage void notrace el1_sync_handler(struct pt_regs *regs)
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{
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unsigned long esr = read_sysreg(esr_el1);
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switch (ESR_ELx_EC(esr)) {
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case ESR_ELx_EC_DABT_CUR:
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case ESR_ELx_EC_IABT_CUR:
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el1_abort(regs, esr);
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break;
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/*
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* We don't handle ESR_ELx_EC_SP_ALIGN, since we will have hit a
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* recursive exception when trying to push the initial pt_regs.
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*/
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case ESR_ELx_EC_PC_ALIGN:
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el1_pc(regs, esr);
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break;
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case ESR_ELx_EC_SYS64:
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case ESR_ELx_EC_UNKNOWN:
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el1_undef(regs);
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break;
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case ESR_ELx_EC_BREAKPT_CUR:
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case ESR_ELx_EC_SOFTSTP_CUR:
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case ESR_ELx_EC_WATCHPT_CUR:
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case ESR_ELx_EC_BRK64:
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el1_dbg(regs, esr);
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break;
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default:
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el1_inv(regs, esr);
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}
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}
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NOKPROBE_SYMBOL(el1_sync_handler);
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static void notrace el0_da(struct pt_regs *regs, unsigned long esr)
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{
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unsigned long far = read_sysreg(far_el1);
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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far = untagged_addr(far);
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do_mem_abort(far, esr, regs);
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}
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NOKPROBE_SYMBOL(el0_da);
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static void notrace el0_ia(struct pt_regs *regs, unsigned long esr)
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{
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unsigned long far = read_sysreg(far_el1);
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/*
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* We've taken an instruction abort from userspace and not yet
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* re-enabled IRQs. If the address is a kernel address, apply
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* BP hardening prior to enabling IRQs and pre-emption.
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*/
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if (!is_ttbr0_addr(far))
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arm64_apply_bp_hardening();
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_mem_abort(far, esr, regs);
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}
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NOKPROBE_SYMBOL(el0_ia);
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static void notrace el0_fpsimd_acc(struct pt_regs *regs, unsigned long esr)
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{
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_fpsimd_acc(esr, regs);
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}
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NOKPROBE_SYMBOL(el0_fpsimd_acc);
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static void notrace el0_sve_acc(struct pt_regs *regs, unsigned long esr)
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{
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_sve_acc(esr, regs);
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}
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NOKPROBE_SYMBOL(el0_sve_acc);
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static void notrace el0_fpsimd_exc(struct pt_regs *regs, unsigned long esr)
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{
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_fpsimd_exc(esr, regs);
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}
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NOKPROBE_SYMBOL(el0_fpsimd_exc);
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static void notrace el0_sys(struct pt_regs *regs, unsigned long esr)
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{
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_sysinstr(esr, regs);
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}
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NOKPROBE_SYMBOL(el0_sys);
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static void notrace el0_pc(struct pt_regs *regs, unsigned long esr)
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{
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unsigned long far = read_sysreg(far_el1);
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if (!is_ttbr0_addr(instruction_pointer(regs)))
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arm64_apply_bp_hardening();
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_sp_pc_abort(far, esr, regs);
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}
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NOKPROBE_SYMBOL(el0_pc);
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static void notrace el0_sp(struct pt_regs *regs, unsigned long esr)
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{
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_sp_pc_abort(regs->sp, esr, regs);
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}
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NOKPROBE_SYMBOL(el0_sp);
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static void notrace el0_undef(struct pt_regs *regs)
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{
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_undefinstr(regs);
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}
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NOKPROBE_SYMBOL(el0_undef);
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static void notrace el0_bti(struct pt_regs *regs)
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{
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_bti(regs);
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}
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NOKPROBE_SYMBOL(el0_bti);
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static void notrace el0_inv(struct pt_regs *regs, unsigned long esr)
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{
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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bad_el0_sync(regs, 0, esr);
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}
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NOKPROBE_SYMBOL(el0_inv);
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static void notrace el0_dbg(struct pt_regs *regs, unsigned long esr)
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{
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/* Only watchpoints write FAR_EL1, otherwise its UNKNOWN */
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unsigned long far = read_sysreg(far_el1);
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if (system_uses_irq_prio_masking())
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gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
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user_exit_irqoff();
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do_debug_exception(far, esr, regs);
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local_daif_restore(DAIF_PROCCTX_NOIRQ);
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}
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NOKPROBE_SYMBOL(el0_dbg);
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static void notrace el0_svc(struct pt_regs *regs)
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{
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if (system_uses_irq_prio_masking())
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gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
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do_el0_svc(regs);
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}
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NOKPROBE_SYMBOL(el0_svc);
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asmlinkage void notrace el0_sync_handler(struct pt_regs *regs)
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{
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unsigned long esr = read_sysreg(esr_el1);
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switch (ESR_ELx_EC(esr)) {
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case ESR_ELx_EC_SVC64:
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el0_svc(regs);
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break;
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case ESR_ELx_EC_DABT_LOW:
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el0_da(regs, esr);
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break;
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case ESR_ELx_EC_IABT_LOW:
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el0_ia(regs, esr);
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break;
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case ESR_ELx_EC_FP_ASIMD:
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el0_fpsimd_acc(regs, esr);
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break;
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case ESR_ELx_EC_SVE:
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el0_sve_acc(regs, esr);
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break;
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case ESR_ELx_EC_FP_EXC64:
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el0_fpsimd_exc(regs, esr);
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break;
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case ESR_ELx_EC_SYS64:
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case ESR_ELx_EC_WFx:
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el0_sys(regs, esr);
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break;
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case ESR_ELx_EC_SP_ALIGN:
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el0_sp(regs, esr);
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break;
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case ESR_ELx_EC_PC_ALIGN:
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el0_pc(regs, esr);
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break;
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case ESR_ELx_EC_UNKNOWN:
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el0_undef(regs);
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break;
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case ESR_ELx_EC_BTI:
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el0_bti(regs);
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break;
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case ESR_ELx_EC_BREAKPT_LOW:
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case ESR_ELx_EC_SOFTSTP_LOW:
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case ESR_ELx_EC_WATCHPT_LOW:
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case ESR_ELx_EC_BRK64:
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el0_dbg(regs, esr);
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break;
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default:
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el0_inv(regs, esr);
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}
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}
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NOKPROBE_SYMBOL(el0_sync_handler);
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#ifdef CONFIG_COMPAT
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static void notrace el0_cp15(struct pt_regs *regs, unsigned long esr)
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{
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user_exit_irqoff();
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local_daif_restore(DAIF_PROCCTX);
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do_cp15instr(esr, regs);
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}
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NOKPROBE_SYMBOL(el0_cp15);
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static void notrace el0_svc_compat(struct pt_regs *regs)
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{
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if (system_uses_irq_prio_masking())
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gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
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do_el0_svc_compat(regs);
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}
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NOKPROBE_SYMBOL(el0_svc_compat);
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asmlinkage void notrace el0_sync_compat_handler(struct pt_regs *regs)
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{
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unsigned long esr = read_sysreg(esr_el1);
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switch (ESR_ELx_EC(esr)) {
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case ESR_ELx_EC_SVC32:
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el0_svc_compat(regs);
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break;
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case ESR_ELx_EC_DABT_LOW:
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el0_da(regs, esr);
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break;
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case ESR_ELx_EC_IABT_LOW:
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el0_ia(regs, esr);
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break;
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case ESR_ELx_EC_FP_ASIMD:
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el0_fpsimd_acc(regs, esr);
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break;
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case ESR_ELx_EC_FP_EXC32:
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el0_fpsimd_exc(regs, esr);
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break;
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case ESR_ELx_EC_PC_ALIGN:
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el0_pc(regs, esr);
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break;
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case ESR_ELx_EC_UNKNOWN:
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case ESR_ELx_EC_CP14_MR:
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case ESR_ELx_EC_CP14_LS:
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case ESR_ELx_EC_CP14_64:
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el0_undef(regs);
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break;
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case ESR_ELx_EC_CP15_32:
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case ESR_ELx_EC_CP15_64:
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el0_cp15(regs, esr);
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break;
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case ESR_ELx_EC_BREAKPT_LOW:
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case ESR_ELx_EC_SOFTSTP_LOW:
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case ESR_ELx_EC_WATCHPT_LOW:
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case ESR_ELx_EC_BKPT32:
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el0_dbg(regs, esr);
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break;
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default:
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el0_inv(regs, esr);
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}
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}
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NOKPROBE_SYMBOL(el0_sync_compat_handler);
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#endif /* CONFIG_COMPAT */
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