Merge pull request #1485 from jeenu-arm/ras
Double-fault and fatal error handling support
This commit is contained in:
danh-arm
GitHub
commit
790e6c5b96
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@ -0,0 +1,263 @@
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/*
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* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert_macros.S>
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#include <asm_macros.S>
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#include <assert_macros.S>
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#include <context.h>
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#include <ea_handle.h>
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#include <ras_arch.h>
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.globl handle_lower_el_ea_esb
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.globl enter_lower_el_sync_ea
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.globl enter_lower_el_async_ea
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/*
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* Function to delegate External Aborts synchronized by ESB instruction at EL3
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* vector entry. This function assumes GP registers x0-x29 have been saved, and
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* are available for use. It delegates the handling of the EA to platform
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* handler, and returns only upon successfully handling the EA; otherwise
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* panics. On return from this function, the original exception handler is
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* expected to resume.
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*/
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func handle_lower_el_ea_esb
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mov x0, #ERROR_EA_ESB
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mrs x1, DISR_EL1
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b ea_proceed
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endfunc handle_lower_el_ea_esb
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/*
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* This function forms the tail end of Synchronous Exception entry from lower
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* EL, and expects to handle only Synchronous External Aborts from lower EL. If
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* any other kind of exception is detected, then this function reports unhandled
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* exception.
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*
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* Since it's part of exception vector, this function doesn't expect any GP
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* registers to have been saved. It delegates the handling of the EA to platform
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* handler, and upon successfully handling the EA, exits EL3; otherwise panics.
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*/
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func enter_lower_el_sync_ea
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/*
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* Explicitly save x30 so as to free up a register and to enable
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* branching.
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*/
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str x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
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mrs x30, esr_el3
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ubfx x30, x30, #ESR_EC_SHIFT, #ESR_EC_LENGTH
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/* Check for I/D aborts from lower EL */
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cmp x30, #EC_IABORT_LOWER_EL
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b.eq 1f
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cmp x30, #EC_DABORT_LOWER_EL
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b.ne 2f
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1:
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/* Test for EA bit in the instruction syndrome */
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mrs x30, esr_el3
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tbz x30, #ESR_ISS_EABORT_EA_BIT, 2f
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/* Save GP registers */
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bl save_gp_registers
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/* Setup exception class and syndrome arguments for platform handler */
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mov x0, #ERROR_EA_SYNC
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mrs x1, esr_el3
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adr x30, el3_exit
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b delegate_sync_ea
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2:
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/* Synchronous exceptions other than the above are assumed to be EA */
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ldr x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
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no_ret report_unhandled_exception
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endfunc enter_lower_el_sync_ea
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/*
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* This function handles SErrors from lower ELs.
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*
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* Since it's part of exception vector, this function doesn't expect any GP
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* registers to have been saved. It delegates the handling of the EA to platform
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* handler, and upon successfully handling the EA, exits EL3; otherwise panics.
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*/
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func enter_lower_el_async_ea
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/*
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* Explicitly save x30 so as to free up a register and to enable
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* branching
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*/
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str x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
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/* Save GP registers */
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bl save_gp_registers
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/* Setup exception class and syndrome arguments for platform handler */
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mov x0, #ERROR_EA_ASYNC
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mrs x1, esr_el3
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adr x30, el3_exit
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b delegate_async_ea
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endfunc enter_lower_el_async_ea
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/*
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* Prelude for Synchronous External Abort handling. This function assumes that
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* all GP registers have been saved by the caller.
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*
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* x0: EA reason
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* x1: EA syndrome
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*/
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func delegate_sync_ea
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#if RAS_EXTENSION
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/*
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* Check for Uncontainable error type. If so, route to the platform
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* fatal error handler rather than the generic EA one.
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*/
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ubfx x2, x1, #EABORT_SET_SHIFT, #EABORT_SET_WIDTH
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cmp x2, #ERROR_STATUS_SET_UC
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b.ne 1f
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/* Check fault status code */
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ubfx x3, x1, #EABORT_DFSC_SHIFT, #EABORT_DFSC_WIDTH
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cmp x3, #SYNC_EA_FSC
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b.ne 1f
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no_ret plat_handle_uncontainable_ea
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1:
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#endif
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b ea_proceed
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endfunc delegate_sync_ea
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/*
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* Prelude for Asynchronous External Abort handling. This function assumes that
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* all GP registers have been saved by the caller.
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*
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* x0: EA reason
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* x1: EA syndrome
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*/
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func delegate_async_ea
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#if RAS_EXTENSION
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/*
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* Check for Implementation Defined Syndrome. If so, skip checking
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* Uncontainable error type from the syndrome as the format is unknown.
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*/
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tbnz x1, #SERROR_IDS_BIT, 1f
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/*
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* Check for Uncontainable error type. If so, route to the platform
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* fatal error handler rather than the generic EA one.
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*/
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ubfx x2, x1, #EABORT_AET_SHIFT, #EABORT_AET_WIDTH
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cmp x2, #ERROR_STATUS_UET_UC
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b.ne 1f
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/* Check DFSC for SError type */
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ubfx x3, x1, #EABORT_DFSC_SHIFT, #EABORT_DFSC_WIDTH
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cmp x3, #DFSC_SERROR
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b.ne 1f
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no_ret plat_handle_uncontainable_ea
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1:
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#endif
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b ea_proceed
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endfunc delegate_async_ea
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/*
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* Delegate External Abort handling to platform's EA handler. This function
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* assumes that all GP registers have been saved by the caller.
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*
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* x0: EA reason
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* x1: EA syndrome
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*/
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func ea_proceed
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/*
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* If the ESR loaded earlier is not zero, we were processing an EA
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* already, and this is a double fault.
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*/
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ldr x5, [sp, #CTX_EL3STATE_OFFSET + CTX_ESR_EL3]
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cbz x5, 1f
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no_ret plat_handle_double_fault
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1:
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/* Save EL3 state */
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mrs x2, spsr_el3
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mrs x3, elr_el3
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stp x2, x3, [sp, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
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/*
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* Save ESR as handling might involve lower ELs, and returning back to
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* EL3 from there would trample the original ESR.
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*/
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mrs x4, scr_el3
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mrs x5, esr_el3
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stp x4, x5, [sp, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3]
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/*
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* Setup rest of arguments, and call platform External Abort handler.
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*
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* x0: EA reason (already in place)
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* x1: Exception syndrome (already in place).
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* x2: Cookie (unused for now).
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* x3: Context pointer.
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* x4: Flags (security state from SCR for now).
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*/
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mov x2, xzr
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mov x3, sp
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ubfx x4, x4, #0, #1
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/* Switch to runtime stack */
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ldr x5, [sp, #CTX_EL3STATE_OFFSET + CTX_RUNTIME_SP]
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msr spsel, #0
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mov sp, x5
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mov x29, x30
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#if ENABLE_ASSERTIONS
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/* Stash the stack pointer */
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mov x28, sp
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#endif
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bl plat_ea_handler
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#if ENABLE_ASSERTIONS
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/*
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* Error handling flows might involve long jumps; so upon returning from
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* the platform error handler, validate that the we've completely
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* unwound the stack.
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*/
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mov x27, sp
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cmp x28, x27
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ASM_ASSERT(eq)
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#endif
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/* Make SP point to context */
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msr spsel, #1
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/* Restore EL3 state and ESR */
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ldp x1, x2, [sp, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
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msr spsr_el3, x1
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msr elr_el3, x2
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/* Restore ESR_EL3 and SCR_EL3 */
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ldp x3, x4, [sp, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3]
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msr scr_el3, x3
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msr esr_el3, x4
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#if ENABLE_ASSERTIONS
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cmp x4, xzr
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ASM_ASSERT(ne)
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#endif
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/* Clear ESR storage */
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str xzr, [sp, #CTX_EL3STATE_OFFSET + CTX_ESR_EL3]
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ret x29
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endfunc ea_proceed
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@ -66,9 +66,7 @@
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/* Save GP registers and restore them afterwards */
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bl save_gp_registers
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mov x0, #ERROR_EA_ESB
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mrs x1, DISR_EL1
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bl delegate_ea
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bl handle_lower_el_ea_esb
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bl restore_gp_registers
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1:
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@ -80,27 +78,6 @@
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#endif
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.endm
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/*
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* Handle External Abort by delegating to the platform's EA handler.
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* Once the platform handler returns, the macro exits EL3 and returns to
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* where the abort was taken from.
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*
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* This macro assumes that x30 is available for use.
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*
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* 'abort_type' is a constant passed to the platform handler, indicating
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* the cause of the External Abort.
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*/
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.macro handle_ea abort_type
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/* Save GP registers */
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bl save_gp_registers
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/* Setup exception class and syndrome arguments for platform handler */
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mov x0, \abort_type
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mrs x1, esr_el3
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adr x30, el3_exit
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b delegate_ea
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.endm
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/* ---------------------------------------------------------------------
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* This macro handles Synchronous exceptions.
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* Only SMC exceptions are supported.
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@ -130,23 +107,9 @@
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cmp x30, #EC_AARCH64_SMC
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b.eq smc_handler64
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/* Check for I/D aborts from lower EL */
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cmp x30, #EC_IABORT_LOWER_EL
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b.eq 1f
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cmp x30, #EC_DABORT_LOWER_EL
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b.ne 2f
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1:
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/* Test for EA bit in the instruction syndrome */
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mrs x30, esr_el3
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tbz x30, #ESR_ISS_EABORT_EA_BIT, 2f
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handle_ea #ERROR_EA_SYNC
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2:
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/* Other kinds of synchronous exceptions are not handled */
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/* Synchronous exceptions other than the above are assumed to be EA */
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ldr x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
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b report_unhandled_exception
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b enter_lower_el_sync_ea
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.endm
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@ -250,7 +213,7 @@ end_vector_entry fiq_sp_el0
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vector_entry serror_sp_el0
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b report_unhandled_exception
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no_ret plat_handle_el3_ea
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end_vector_entry serror_sp_el0
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/* ---------------------------------------------------------------------
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@ -276,7 +239,7 @@ vector_entry fiq_sp_elx
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end_vector_entry fiq_sp_elx
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vector_entry serror_sp_elx
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b report_unhandled_exception
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no_ret plat_handle_el3_ea
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end_vector_entry serror_sp_elx
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/* ---------------------------------------------------------------------
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@ -306,13 +269,7 @@ end_vector_entry fiq_aarch64
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vector_entry serror_aarch64
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msr daifclr, #DAIF_ABT_BIT
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/*
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* Explicitly save x30 so as to free up a register and to enable
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* branching
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*/
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str x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
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handle_ea #ERROR_EA_ASYNC
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b enter_lower_el_async_ea
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end_vector_entry serror_aarch64
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/* ---------------------------------------------------------------------
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@ -342,13 +299,7 @@ end_vector_entry fiq_aarch32
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vector_entry serror_aarch32
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msr daifclr, #DAIF_ABT_BIT
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/*
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* Explicitly save x30 so as to free up a register and to enable
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* branching
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*/
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str x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
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handle_ea #ERROR_EA_ASYNC
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b enter_lower_el_async_ea
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end_vector_entry serror_aarch32
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@ -525,62 +476,3 @@ rt_svc_fw_critical_error:
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msr spsel, #1
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no_ret report_unhandled_exception
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endfunc smc_handler
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/*
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* Delegate External Abort handling to platform's EA handler. This function
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* assumes that all GP registers have been saved by the caller.
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*
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* x0: EA reason
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* x1: EA syndrome
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*/
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func delegate_ea
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/* Save EL3 state */
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mrs x2, spsr_el3
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mrs x3, elr_el3
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stp x2, x3, [sp, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
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/*
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* Save ESR as handling might involve lower ELs, and returning back to
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* EL3 from there would trample the original ESR.
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*/
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mrs x4, scr_el3
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mrs x5, esr_el3
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stp x4, x5, [sp, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3]
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/*
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* Setup rest of arguments, and call platform External Abort handler.
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*
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* x0: EA reason (already in place)
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* x1: Exception syndrome (already in place).
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* x2: Cookie (unused for now).
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* x3: Context pointer.
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* x4: Flags (security state from SCR for now).
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*/
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mov x2, xzr
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mov x3, sp
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ubfx x4, x4, #0, #1
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/* Switch to runtime stack */
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ldr x5, [sp, #CTX_EL3STATE_OFFSET + CTX_RUNTIME_SP]
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msr spsel, #0
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mov sp, x5
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mov x29, x30
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bl plat_ea_handler
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mov x30, x29
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/* Make SP point to context */
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msr spsel, #1
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/* Restore EL3 state */
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ldp x1, x2, [sp, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
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msr spsr_el3, x1
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msr elr_el3, x2
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/* Restore ESR_EL3 and SCR_EL3 */
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ldp x3, x4, [sp, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3]
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msr scr_el3, x3
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msr esr_el3, x4
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ret
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endfunc delegate_ea
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|
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@ -19,6 +19,7 @@ BL31_SOURCES += bl31/bl31_main.c \
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bl31/interrupt_mgmt.c \
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bl31/aarch64/bl31_entrypoint.S \
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bl31/aarch64/crash_reporting.S \
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bl31/aarch64/ea_delegate.S \
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bl31/aarch64/runtime_exceptions.S \
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bl31/bl31_context_mgmt.c \
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common/runtime_svc.c \
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@ -2850,6 +2850,106 @@ you can keep the default implementation here (which calls ``console_flush()``).
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If you're trying to debug crashes in BL1, you can call the console_xx_core_flush
|
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function exported by some console drivers from here.
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Extternal Abort handling and RAS Support
|
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----------------------------------------
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Function : plat_ea_handler
|
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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::
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Argument : int
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Argument : uint64_t
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Argument : void *
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Argument : void *
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Argument : uint64_t
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Return : void
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This function is invoked by the RAS framework for the platform to handle an
|
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External Abort received at EL3. The intention of the function is to attempt to
|
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resolve the cause of External Abort and return; if that's not possible, to
|
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initiate orderly shutdown of the system.
|
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The first parameter (``int ea_reason``) indicates the reason for External Abort.
|
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Its value is one of ``ERROR_EA_*`` constants defined in ``ea_handle.h``.
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The second parameter (``uint64_t syndrome``) is the respective syndrome
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presented to EL3 after having received the External Abort. Depending on the
|
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nature of the abort (as can be inferred from the ``ea_reason`` parameter), this
|
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can be the content of either ``ESR_EL3`` or ``DISR_EL1``.
|
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|
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The third parameter (``void *cookie``) is unused for now. The fourth parameter
|
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(``void *handle``) is a pointer to the preempted context. The fifth parameter
|
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(``uint64_t flags``) indicates the preempted security state. These parameters
|
||||
are received from the top-level exception handler.
|
||||
|
||||
If ``RAS_EXTENSION`` is set to ``1``, the default implementation of this
|
||||
function iterates through RAS handlers registered by the platform. If any of the
|
||||
RAS handlers resolve the External Abort, no further action is taken.
|
||||
|
||||
If ``RAS_EXTENSION`` is set to ``0``, or if none of the platform RAS handlers
|
||||
could resolve the External Abort, the default implementation prints an error
|
||||
message, and panics.
|
||||
|
||||
Function : plat_handle_uncontainable_ea
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
::
|
||||
|
||||
Argument : int
|
||||
Argument : uint64_t
|
||||
Return : void
|
||||
|
||||
This function is invoked by the RAS framework when an External Abort of
|
||||
Uncontainable type is received at EL3. Due to the critical nature of
|
||||
Uncontainable errors, the intention of this function is to initiate orderly
|
||||
shutdown of the system, and is not expected to return.
|
||||
|
||||
This function must be implemented in assembly.
|
||||
|
||||
The first and second parameters are the same as that of ``plat_ea_handler``.
|
||||
|
||||
The default implementation of this function calls
|
||||
``report_unhandled_exception``.
|
||||
|
||||
Function : plat_handle_double_fault
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
::
|
||||
|
||||
Argument : int
|
||||
Argument : uint64_t
|
||||
Return : void
|
||||
|
||||
This function is invoked by the RAS framework when another External Abort is
|
||||
received at EL3 while one is already being handled. I.e., a call to
|
||||
``plat_ea_handler`` is outstanding. Due to its critical nature, the intention of
|
||||
this function is to initiate orderly shutdown of the system, and is not expected
|
||||
recover or return.
|
||||
|
||||
This function must be implemented in assembly.
|
||||
|
||||
The first and second parameters are the same as that of ``plat_ea_handler``.
|
||||
|
||||
The default implementation of this function calls
|
||||
``report_unhandled_exception``.
|
||||
|
||||
Function : plat_handle_el3_ea
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
::
|
||||
|
||||
Return : void
|
||||
|
||||
This function is invoked when an External Abort is received while executing in
|
||||
EL3. Due to its critical nature, the intention of this function is to initiate
|
||||
orderly shutdown of the system, and is not expected recover or return.
|
||||
|
||||
This function must be implemented in assembly.
|
||||
|
||||
The default implementation of this function calls
|
||||
``report_unhandled_exception``.
|
||||
|
||||
Build flags
|
||||
-----------
|
||||
|
||||
|
|
|
|||
|
|
@ -4,15 +4,8 @@
|
|||
* SPDX-License-Identifier: BSD-3-Clause
|
||||
*/
|
||||
|
||||
#ifndef __RAS_H__
|
||||
#define __RAS_H__
|
||||
|
||||
#include <arch.h>
|
||||
#include <arch_helpers.h>
|
||||
#include <assert.h>
|
||||
#include <context.h>
|
||||
#include <mmio.h>
|
||||
#include <stdint.h>
|
||||
#ifndef RAS_ARCH_H
|
||||
#define RAS_ARCH_H
|
||||
|
||||
/*
|
||||
* Size of nodes implementing Standard Error Records - currently only 4k is
|
||||
|
|
@ -146,12 +139,53 @@
|
|||
#define ERR_CTLR_ENABLE_FIELD(_ctlr, _field) \
|
||||
ERR_CTLR_SET_FIELD(_ctlr, _field, ERR_CTLR_ ##_field ##_MASK)
|
||||
|
||||
/* Uncorrected error types */
|
||||
/* Uncorrected error types for Asynchronous exceptions */
|
||||
#define ERROR_STATUS_UET_UC 0x0 /* Uncontainable */
|
||||
#define ERROR_STATUS_UET_UEU 0x1 /* Unrecoverable */
|
||||
#define ERROR_STATUS_UET_UEO 0x2 /* Restable */
|
||||
#define ERROR_STATUS_UET_UER 0x3 /* Recoverable */
|
||||
|
||||
/* Error types for Synchronous exceptions */
|
||||
#define ERROR_STATUS_SET_UER 0x0 /* Recoverable */
|
||||
#define ERROR_STATUS_SET_UEO 0x1 /* Restable */
|
||||
#define ERROR_STATUS_SET_UC 0x2 /* Uncontainable */
|
||||
#define ERROR_STATUS_SET_CE 0x3 /* Corrected */
|
||||
|
||||
/* Implementation Defined Syndrome bit in ESR */
|
||||
#define SERROR_IDS_BIT U(24)
|
||||
|
||||
/*
|
||||
* Asynchronous Error Type in exception syndrome. The field has same values in
|
||||
* both DISR_EL1 and ESR_EL3 for SError.
|
||||
*/
|
||||
#define EABORT_AET_SHIFT U(10)
|
||||
#define EABORT_AET_WIDTH U(3)
|
||||
#define EABORT_AET_MASK U(0x7)
|
||||
|
||||
/* DFSC field in Asynchronous exception syndrome */
|
||||
#define EABORT_DFSC_SHIFT U(0)
|
||||
#define EABORT_DFSC_WIDTH U(6)
|
||||
#define EABORT_DFSC_MASK U(0x3f)
|
||||
|
||||
/* Synchronous Error Type in exception syndrome. */
|
||||
#define EABORT_SET_SHIFT U(11)
|
||||
#define EABORT_SET_WIDTH U(2)
|
||||
#define EABORT_SET_MASK U(0x3)
|
||||
|
||||
/* DFSC code for SErrors */
|
||||
#define DFSC_SERROR 0x11
|
||||
|
||||
/* I/DFSC code for synchronous external abort */
|
||||
#define SYNC_EA_FSC 0x10
|
||||
|
||||
#ifndef __ASSEMBLY__
|
||||
|
||||
#include <arch.h>
|
||||
#include <arch_helpers.h>
|
||||
#include <assert.h>
|
||||
#include <context.h>
|
||||
#include <mmio.h>
|
||||
#include <stdint.h>
|
||||
|
||||
/*
|
||||
* Standard Error Record accessors for memory-mapped registers.
|
||||
|
|
@ -221,5 +255,6 @@ static inline void ser_sys_select_record(unsigned int idx)
|
|||
/* Library functions to probe Standard Error Record */
|
||||
int ser_probe_memmap(uintptr_t base, unsigned int size_num_k, int *probe_data);
|
||||
int ser_probe_sysreg(unsigned int idx_start, unsigned int num_idx, int *probe_data);
|
||||
#endif /* __ASSEMBLY__ */
|
||||
|
||||
#endif /* __RAS_H__ */
|
||||
#endif /* RAS_ARCH_H */
|
||||
|
|
|
|||
|
|
@ -20,6 +20,10 @@
|
|||
.weak bl31_plat_enable_mmu
|
||||
.weak bl32_plat_enable_mmu
|
||||
|
||||
.weak plat_handle_uncontainable_ea
|
||||
.weak plat_handle_double_fault
|
||||
.weak plat_handle_el3_ea
|
||||
|
||||
#if !ENABLE_PLAT_COMPAT
|
||||
.globl platform_get_core_pos
|
||||
|
||||
|
|
@ -186,3 +190,34 @@ endfunc bl31_plat_enable_mmu
|
|||
func bl32_plat_enable_mmu
|
||||
b enable_mmu_direct_el1
|
||||
endfunc bl32_plat_enable_mmu
|
||||
|
||||
|
||||
/* -----------------------------------------------------
|
||||
* Platform handler for Uncontainable External Abort.
|
||||
*
|
||||
* x0: EA reason
|
||||
* x1: EA syndrome
|
||||
* -----------------------------------------------------
|
||||
*/
|
||||
func plat_handle_uncontainable_ea
|
||||
b report_unhandled_exception
|
||||
endfunc plat_handle_uncontainable_ea
|
||||
|
||||
/* -----------------------------------------------------
|
||||
* Platform handler for Double Fault.
|
||||
*
|
||||
* x0: EA reason
|
||||
* x1: EA syndrome
|
||||
* -----------------------------------------------------
|
||||
*/
|
||||
func plat_handle_double_fault
|
||||
b report_unhandled_exception
|
||||
endfunc plat_handle_double_fault
|
||||
|
||||
/* -----------------------------------------------------
|
||||
* Platform handler for EL3 External Abort.
|
||||
* -----------------------------------------------------
|
||||
*/
|
||||
func plat_handle_el3_ea
|
||||
b report_unhandled_exception
|
||||
endfunc plat_handle_el3_ea
|
||||
|
|
|
|||
Loading…
Reference in New Issue