Workaround for CVE-2017-5715 on Cortex A73 and A75
Invalidate the Branch Target Buffer (BTB) on entry to EL3 by
temporarily dropping into AArch32 Secure-EL1 and executing the
`BPIALL` instruction.
This is achieved by using 3 vector tables. There is the runtime
vector table which is used to handle exceptions and 2 additional
tables which are required to implement this workaround. The
additional tables are `vbar0` and `vbar1`.
The sequence of events for handling a single exception is
as follows:
1) Install vector table `vbar0` which saves the CPU context on entry
to EL3 and sets up the Secure-EL1 context to execute in AArch32 mode
with the MMU disabled and I$ enabled. This is the default vector table.
2) Before doing an ERET into Secure-EL1, switch vbar to point to
another vector table `vbar1`. This is required to restore EL3 state
when returning from the workaround, before proceeding with normal EL3
exception handling.
3) While in Secure-EL1, the `BPIALL` instruction is executed and an
SMC call back to EL3 is performed.
4) On entry to EL3 from Secure-EL1, the saved context from step 1) is
restored. The vbar is switched to point to `vbar0` in preparation to
handle further exceptions. Finally a branch to the runtime vector
table entry is taken to complete the handling of the original
exception.
This workaround is enabled by default on the affected CPUs.
NOTE
====
There are 4 different stubs in Secure-EL1. Each stub corresponds to
an exception type such as Sync/IRQ/FIQ/SError. Each stub will move a
different value in `R0` before doing an SMC call back into EL3.
Without this piece of information it would not be possible to know
what the original exception type was as we cannot use `ESR_EL3` to
distinguish between IRQs and FIQs.
Change-Id: I90b32d14a3735290b48685d43c70c99daaa4b434
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>
diff --git a/bl31/bl31.mk b/bl31/bl31.mk
index 0732e05..8ff8f89 100644
--- a/bl31/bl31.mk
+++ b/bl31/bl31.mk
@@ -59,7 +59,8 @@
endif
ifeq (${WORKAROUND_CVE_2017_5715},1)
-BL31_SOURCES += lib/cpus/aarch64/workaround_cve_2017_5715_mmu.S
+BL31_SOURCES += lib/cpus/aarch64/workaround_cve_2017_5715_mmu.S \
+ lib/cpus/aarch64/workaround_cve_2017_5715_bpiall.S
endif
BL31_LINKERFILE := bl31/bl31.ld.S
diff --git a/include/lib/aarch64/arch.h b/include/lib/aarch64/arch.h
index 96e2d5f..13a8c79 100644
--- a/include/lib/aarch64/arch.h
+++ b/include/lib/aarch64/arch.h
@@ -337,6 +337,11 @@
#define SPSR_T_ARM U(0x0)
#define SPSR_T_THUMB U(0x1)
+#define SPSR_M_SHIFT U(4)
+#define SPSR_M_MASK U(0x1)
+#define SPSR_M_AARCH64 U(0x0)
+#define SPSR_M_AARCH32 U(0x1)
+
#define DISABLE_ALL_EXCEPTIONS \
(DAIF_FIQ_BIT | DAIF_IRQ_BIT | DAIF_ABT_BIT | DAIF_DBG_BIT)
diff --git a/include/lib/el3_runtime/aarch64/context.h b/include/lib/el3_runtime/aarch64/context.h
index 5889904..5e212ec 100644
--- a/include/lib/el3_runtime/aarch64/context.h
+++ b/include/lib/el3_runtime/aarch64/context.h
@@ -46,12 +46,26 @@
#define CTX_GPREG_SP_EL0 U(0xf8)
#define CTX_GPREGS_END U(0x100)
+#if WORKAROUND_CVE_2017_5715
+#define CTX_CVE_2017_5715_OFFSET (CTX_GPREGS_OFFSET + CTX_GPREGS_END)
+#define CTX_CVE_2017_5715_QUAD0 U(0x0)
+#define CTX_CVE_2017_5715_QUAD1 U(0x8)
+#define CTX_CVE_2017_5715_QUAD2 U(0x10)
+#define CTX_CVE_2017_5715_QUAD3 U(0x18)
+#define CTX_CVE_2017_5715_QUAD4 U(0x20)
+#define CTX_CVE_2017_5715_QUAD5 U(0x28)
+#define CTX_CVE_2017_5715_END U(0x30)
+#else
+#define CTX_CVE_2017_5715_OFFSET CTX_GPREGS_OFFSET
+#define CTX_CVE_2017_5715_END CTX_GPREGS_END
+#endif
+
/*******************************************************************************
* Constants that allow assembler code to access members of and the 'el3_state'
* structure at their correct offsets. Note that some of the registers are only
* 32-bits wide but are stored as 64-bit values for convenience
******************************************************************************/
-#define CTX_EL3STATE_OFFSET (CTX_GPREGS_OFFSET + CTX_GPREGS_END)
+#define CTX_EL3STATE_OFFSET (CTX_CVE_2017_5715_OFFSET + CTX_CVE_2017_5715_END)
#define CTX_SCR_EL3 U(0x0)
#define CTX_RUNTIME_SP U(0x8)
#define CTX_SPSR_EL3 U(0x10)
@@ -186,6 +200,9 @@
/* Constants to determine the size of individual context structures */
#define CTX_GPREG_ALL (CTX_GPREGS_END >> DWORD_SHIFT)
+#if WORKAROUND_CVE_2017_5715
+#define CTX_CVE_2017_5715_ALL (CTX_CVE_2017_5715_END >> DWORD_SHIFT)
+#endif
#define CTX_SYSREG_ALL (CTX_SYSREGS_END >> DWORD_SHIFT)
#if CTX_INCLUDE_FPREGS
#define CTX_FPREG_ALL (CTX_FPREGS_END >> DWORD_SHIFT)
@@ -201,6 +218,10 @@
*/
DEFINE_REG_STRUCT(gp_regs, CTX_GPREG_ALL);
+#if WORKAROUND_CVE_2017_5715
+DEFINE_REG_STRUCT(cve_2017_5715_regs, CTX_CVE_2017_5715_ALL);
+#endif
+
/*
* AArch64 EL1 system register context structure for preserving the
* architectural state during switches from one security state to
@@ -242,6 +263,9 @@
*/
typedef struct cpu_context {
gp_regs_t gpregs_ctx;
+#if WORKAROUND_CVE_2017_5715
+ cve_2017_5715_regs_t cve_2017_5715_regs_ctx;
+#endif
el3_state_t el3state_ctx;
el1_sys_regs_t sysregs_ctx;
#if CTX_INCLUDE_FPREGS
diff --git a/lib/cpus/aarch64/cortex_a73.S b/lib/cpus/aarch64/cortex_a73.S
index f642816..c43f07e 100644
--- a/lib/cpus/aarch64/cortex_a73.S
+++ b/lib/cpus/aarch64/cortex_a73.S
@@ -36,6 +36,11 @@
endfunc cortex_a73_disable_smp
func cortex_a73_reset_func
+#if IMAGE_BL31 && WORKAROUND_CVE_2017_5715
+ adr x0, workaround_bpiall_vbar0_runtime_exceptions
+ msr vbar_el3, x0
+#endif
+
/* ---------------------------------------------
* Enable the SMP bit.
* Clobbers : x0
diff --git a/lib/cpus/aarch64/cortex_a75.S b/lib/cpus/aarch64/cortex_a75.S
index 4cab9e4..1a9d904 100644
--- a/lib/cpus/aarch64/cortex_a75.S
+++ b/lib/cpus/aarch64/cortex_a75.S
@@ -12,6 +12,11 @@
#include <cortex_a75.h>
func cortex_a75_reset_func
+#if IMAGE_BL31 && WORKAROUND_CVE_2017_5715
+ adr x0, workaround_bpiall_vbar0_runtime_exceptions
+ msr vbar_el3, x0
+#endif
+
#if ENABLE_AMU
/* Make sure accesses from EL0/EL1 and EL2 are not trapped to EL3 */
mrs x0, actlr_el3
diff --git a/lib/cpus/aarch64/workaround_cve_2017_5715_bpiall.S b/lib/cpus/aarch64/workaround_cve_2017_5715_bpiall.S
new file mode 100644
index 0000000..cd29266
--- /dev/null
+++ b/lib/cpus/aarch64/workaround_cve_2017_5715_bpiall.S
@@ -0,0 +1,372 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <context.h>
+
+ .globl workaround_bpiall_vbar0_runtime_exceptions
+
+#define EMIT_BPIALL 0xee070fd5
+#define EMIT_MOV_R0_IMM(v) 0xe3a0000##v
+#define EMIT_SMC 0xe1600070
+
+ .macro enter_workaround _stub_name
+ /* Save GP regs */
+ stp x0, x1, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0]
+ stp x2, x3, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X2]
+ stp x4, x5, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X4]
+ stp x6, x7, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X6]
+ stp x8, x9, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X8]
+ stp x10, x11, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X10]
+ stp x12, x13, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X12]
+ stp x14, x15, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X14]
+ stp x16, x17, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X16]
+ stp x18, x19, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X18]
+ stp x20, x21, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X20]
+ stp x22, x23, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X22]
+ stp x24, x25, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X24]
+ stp x26, x27, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X26]
+ stp x28, x29, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X28]
+
+ adr x4, \_stub_name
+
+ /*
+ * Load SPSR_EL3 and VBAR_EL3. SPSR_EL3 is set up to have
+ * all interrupts masked in preparation to running the workaround
+ * stub in S-EL1. VBAR_EL3 points to the vector table that
+ * will handle the SMC back from the workaround stub.
+ */
+ ldp x0, x1, [x4, #0]
+
+ /*
+ * Load SCTLR_EL1 and ELR_EL3. SCTLR_EL1 is configured to disable
+ * the MMU in S-EL1. ELR_EL3 points to the appropriate stub in S-EL1.
+ */
+ ldp x2, x3, [x4, #16]
+
+ mrs x4, scr_el3
+ mrs x5, spsr_el3
+ mrs x6, elr_el3
+ mrs x7, sctlr_el1
+ mrs x8, esr_el3
+
+ /* Preserve system registers in the workaround context */
+ stp x4, x5, [sp, #CTX_CVE_2017_5715_OFFSET + CTX_CVE_2017_5715_QUAD0]
+ stp x6, x7, [sp, #CTX_CVE_2017_5715_OFFSET + CTX_CVE_2017_5715_QUAD2]
+ stp x8, x30, [sp, #CTX_CVE_2017_5715_OFFSET + CTX_CVE_2017_5715_QUAD4]
+
+ /*
+ * Setting SCR_EL3 to all zeroes means that the NS, RW
+ * and SMD bits are configured as expected.
+ */
+ msr scr_el3, xzr
+
+ /*
+ * Reload system registers with the crafted values
+ * in preparation for entry in S-EL1.
+ */
+ msr spsr_el3, x0
+ msr vbar_el3, x1
+ msr sctlr_el1, x2
+ msr elr_el3, x3
+
+ eret
+ .endm
+
+ /* ---------------------------------------------------------------------
+ * This vector table is used at runtime to enter the workaround at
+ * AArch32 S-EL1 for Sync/IRQ/FIQ/SError exceptions. If the workaround
+ * is not enabled, the existing runtime exception vector table is used.
+ * ---------------------------------------------------------------------
+ */
+vector_base workaround_bpiall_vbar0_runtime_exceptions
+
+ /* ---------------------------------------------------------------------
+ * Current EL with SP_EL0 : 0x0 - 0x200
+ * ---------------------------------------------------------------------
+ */
+vector_entry workaround_bpiall_vbar0_sync_exception_sp_el0
+ b sync_exception_sp_el0
+ /*
+ * Since each vector table entry is 128 bytes, we can store the
+ * stub context in the unused space to minimize memory footprint.
+ */
+aarch32_stub_smc:
+ .word EMIT_BPIALL
+ .word EMIT_MOV_R0_IMM(1)
+ .word EMIT_SMC
+aarch32_stub_ctx_smc:
+ /* Mask all interrupts and set AArch32 Supervisor mode */
+ .quad (SPSR_AIF_MASK << SPSR_AIF_SHIFT | \
+ SPSR_M_AARCH32 << SPSR_M_SHIFT | \
+ MODE32_svc << MODE32_SHIFT)
+
+ /*
+ * VBAR_EL3 points to vbar1 which is the vector table
+ * used while the workaround is executing.
+ */
+ .quad workaround_bpiall_vbar1_runtime_exceptions
+
+ /* Setup SCTLR_EL1 with MMU off and I$ on */
+ .quad SCTLR_AARCH32_EL1_RES1 | SCTLR_I_BIT
+
+ /* ELR_EL3 is setup to point to the sync exception stub in AArch32 */
+ .quad aarch32_stub_smc
+ check_vector_size workaround_bpiall_vbar0_sync_exception_sp_el0
+
+vector_entry workaround_bpiall_vbar0_irq_sp_el0
+ b irq_sp_el0
+aarch32_stub_irq:
+ .word EMIT_BPIALL
+ .word EMIT_MOV_R0_IMM(2)
+ .word EMIT_SMC
+aarch32_stub_ctx_irq:
+ .quad (SPSR_AIF_MASK << SPSR_AIF_SHIFT | \
+ SPSR_M_AARCH32 << SPSR_M_SHIFT | \
+ MODE32_svc << MODE32_SHIFT)
+ .quad workaround_bpiall_vbar1_runtime_exceptions
+ .quad SCTLR_AARCH32_EL1_RES1 | SCTLR_I_BIT
+ .quad aarch32_stub_irq
+ check_vector_size workaround_bpiall_vbar0_irq_sp_el0
+
+vector_entry workaround_bpiall_vbar0_fiq_sp_el0
+ b fiq_sp_el0
+aarch32_stub_fiq:
+ .word EMIT_BPIALL
+ .word EMIT_MOV_R0_IMM(4)
+ .word EMIT_SMC
+aarch32_stub_ctx_fiq:
+ .quad (SPSR_AIF_MASK << SPSR_AIF_SHIFT | \
+ SPSR_M_AARCH32 << SPSR_M_SHIFT | \
+ MODE32_svc << MODE32_SHIFT)
+ .quad workaround_bpiall_vbar1_runtime_exceptions
+ .quad SCTLR_AARCH32_EL1_RES1 | SCTLR_I_BIT
+ .quad aarch32_stub_fiq
+ check_vector_size workaround_bpiall_vbar0_fiq_sp_el0
+
+vector_entry workaround_bpiall_vbar0_serror_sp_el0
+ b serror_sp_el0
+aarch32_stub_serror:
+ .word EMIT_BPIALL
+ .word EMIT_MOV_R0_IMM(8)
+ .word EMIT_SMC
+aarch32_stub_ctx_serror:
+ .quad (SPSR_AIF_MASK << SPSR_AIF_SHIFT | \
+ SPSR_M_AARCH32 << SPSR_M_SHIFT | \
+ MODE32_svc << MODE32_SHIFT)
+ .quad workaround_bpiall_vbar1_runtime_exceptions
+ .quad SCTLR_AARCH32_EL1_RES1 | SCTLR_I_BIT
+ .quad aarch32_stub_serror
+ check_vector_size workaround_bpiall_vbar0_serror_sp_el0
+
+ /* ---------------------------------------------------------------------
+ * Current EL with SP_ELx: 0x200 - 0x400
+ * ---------------------------------------------------------------------
+ */
+vector_entry workaround_bpiall_vbar0_sync_exception_sp_elx
+ b sync_exception_sp_elx
+ check_vector_size workaround_bpiall_vbar0_sync_exception_sp_elx
+
+vector_entry workaround_bpiall_vbar0_irq_sp_elx
+ b irq_sp_elx
+ check_vector_size workaround_bpiall_vbar0_irq_sp_elx
+
+vector_entry workaround_bpiall_vbar0_fiq_sp_elx
+ b fiq_sp_elx
+ check_vector_size workaround_bpiall_vbar0_fiq_sp_elx
+
+vector_entry workaround_bpiall_vbar0_serror_sp_elx
+ b serror_sp_elx
+ check_vector_size workaround_bpiall_vbar0_serror_sp_elx
+
+ /* ---------------------------------------------------------------------
+ * Lower EL using AArch64 : 0x400 - 0x600
+ * ---------------------------------------------------------------------
+ */
+vector_entry workaround_bpiall_vbar0_sync_exception_aarch64
+ enter_workaround aarch32_stub_ctx_smc
+ check_vector_size workaround_bpiall_vbar0_sync_exception_aarch64
+
+vector_entry workaround_bpiall_vbar0_irq_aarch64
+ enter_workaround aarch32_stub_ctx_irq
+ check_vector_size workaround_bpiall_vbar0_irq_aarch64
+
+vector_entry workaround_bpiall_vbar0_fiq_aarch64
+ enter_workaround aarch32_stub_ctx_fiq
+ check_vector_size workaround_bpiall_vbar0_fiq_aarch64
+
+vector_entry workaround_bpiall_vbar0_serror_aarch64
+ enter_workaround aarch32_stub_ctx_serror
+ check_vector_size workaround_bpiall_vbar0_serror_aarch64
+
+ /* ---------------------------------------------------------------------
+ * Lower EL using AArch32 : 0x600 - 0x800
+ * ---------------------------------------------------------------------
+ */
+vector_entry workaround_bpiall_vbar0_sync_exception_aarch32
+ enter_workaround aarch32_stub_ctx_smc
+ check_vector_size workaround_bpiall_vbar0_sync_exception_aarch32
+
+vector_entry workaround_bpiall_vbar0_irq_aarch32
+ enter_workaround aarch32_stub_ctx_irq
+ check_vector_size workaround_bpiall_vbar0_irq_aarch32
+
+vector_entry workaround_bpiall_vbar0_fiq_aarch32
+ enter_workaround aarch32_stub_ctx_fiq
+ check_vector_size workaround_bpiall_vbar0_fiq_aarch32
+
+vector_entry workaround_bpiall_vbar0_serror_aarch32
+ enter_workaround aarch32_stub_ctx_serror
+ check_vector_size workaround_bpiall_vbar0_serror_aarch32
+
+ /* ---------------------------------------------------------------------
+ * This vector table is used while the workaround is executing. It
+ * installs a simple SMC handler to allow the Sync/IRQ/FIQ/SError
+ * workaround stubs to enter EL3 from S-EL1. It restores the previous
+ * EL3 state before proceeding with the normal runtime exception vector.
+ * ---------------------------------------------------------------------
+ */
+vector_base workaround_bpiall_vbar1_runtime_exceptions
+
+ /* ---------------------------------------------------------------------
+ * Current EL with SP_EL0 : 0x0 - 0x200 (UNUSED)
+ * ---------------------------------------------------------------------
+ */
+vector_entry workaround_bpiall_vbar1_sync_exception_sp_el0
+ b report_unhandled_exception
+ check_vector_size workaround_bpiall_vbar1_sync_exception_sp_el0
+
+vector_entry workaround_bpiall_vbar1_irq_sp_el0
+ b report_unhandled_interrupt
+ check_vector_size workaround_bpiall_vbar1_irq_sp_el0
+
+vector_entry workaround_bpiall_vbar1_fiq_sp_el0
+ b report_unhandled_interrupt
+ check_vector_size workaround_bpiall_vbar1_fiq_sp_el0
+
+vector_entry workaround_bpiall_vbar1_serror_sp_el0
+ b report_unhandled_exception
+ check_vector_size workaround_bpiall_vbar1_serror_sp_el0
+
+ /* ---------------------------------------------------------------------
+ * Current EL with SP_ELx: 0x200 - 0x400 (UNUSED)
+ * ---------------------------------------------------------------------
+ */
+vector_entry workaround_bpiall_vbar1_sync_exception_sp_elx
+ b report_unhandled_exception
+ check_vector_size workaround_bpiall_vbar1_sync_exception_sp_elx
+
+vector_entry workaround_bpiall_vbar1_irq_sp_elx
+ b report_unhandled_interrupt
+ check_vector_size workaround_bpiall_vbar1_irq_sp_elx
+
+vector_entry workaround_bpiall_vbar1_fiq_sp_elx
+ b report_unhandled_interrupt
+ check_vector_size workaround_bpiall_vbar1_fiq_sp_elx
+
+vector_entry workaround_bpiall_vbar1_serror_sp_elx
+ b report_unhandled_exception
+ check_vector_size workaround_bpiall_vbar1_serror_sp_elx
+
+ /* ---------------------------------------------------------------------
+ * Lower EL using AArch64 : 0x400 - 0x600 (UNUSED)
+ * ---------------------------------------------------------------------
+ */
+vector_entry workaround_bpiall_vbar1_sync_exception_aarch64
+ b report_unhandled_exception
+ check_vector_size workaround_bpiall_vbar1_sync_exception_aarch64
+
+vector_entry workaround_bpiall_vbar1_irq_aarch64
+ b report_unhandled_interrupt
+ check_vector_size workaround_bpiall_vbar1_irq_aarch64
+
+vector_entry workaround_bpiall_vbar1_fiq_aarch64
+ b report_unhandled_interrupt
+ check_vector_size workaround_bpiall_vbar1_fiq_aarch64
+
+vector_entry workaround_bpiall_vbar1_serror_aarch64
+ b report_unhandled_exception
+ check_vector_size workaround_bpiall_vbar1_serror_aarch64
+
+ /* ---------------------------------------------------------------------
+ * Lower EL using AArch32 : 0x600 - 0x800
+ * ---------------------------------------------------------------------
+ */
+vector_entry workaround_bpiall_vbar1_sync_exception_aarch32
+ /* Restore register state from the workaround context */
+ ldp x2, x3, [sp, #CTX_CVE_2017_5715_OFFSET + CTX_CVE_2017_5715_QUAD0]
+ ldp x4, x5, [sp, #CTX_CVE_2017_5715_OFFSET + CTX_CVE_2017_5715_QUAD2]
+ ldp x6, x30, [sp, #CTX_CVE_2017_5715_OFFSET + CTX_CVE_2017_5715_QUAD4]
+
+ /* Apply the restored system register state */
+ msr scr_el3, x2
+ msr spsr_el3, x3
+ msr elr_el3, x4
+ msr sctlr_el1, x5
+ msr esr_el3, x6
+
+ /*
+ * Workaround is complete, so swap VBAR_EL3 to point
+ * to workaround entry table in preparation for subsequent
+ * Sync/IRQ/FIQ/SError exceptions.
+ */
+ adr x2, workaround_bpiall_vbar0_runtime_exceptions
+ msr vbar_el3, x2
+
+ /*
+ * Restore all GP regs except x0 and x1. The value in x0
+ * indicates the type of the original exception.
+ */
+ ldp x2, x3, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X2]
+ ldp x4, x5, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X4]
+ ldp x6, x7, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X6]
+ ldp x8, x9, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X8]
+ ldp x10, x11, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X10]
+ ldp x12, x13, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X12]
+ ldp x14, x15, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X14]
+ ldp x16, x17, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X16]
+ ldp x18, x19, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X18]
+ ldp x20, x21, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X20]
+ ldp x22, x23, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X22]
+ ldp x24, x25, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X24]
+ ldp x26, x27, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X26]
+ ldp x28, x29, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X28]
+
+ /*
+ * Each of these handlers will first restore x0 and x1 from
+ * the context and the branch to the common implementation for
+ * each of the exception types.
+ */
+ tbnz x0, #1, workaround_bpiall_vbar1_irq
+ tbnz x0, #2, workaround_bpiall_vbar1_fiq
+ tbnz x0, #3, workaround_bpiall_vbar1_serror
+
+ /* Fallthrough case for Sync exception */
+ ldp x0, x1, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0]
+ b sync_exception_aarch64
+ check_vector_size workaround_bpiall_vbar1_sync_exception_aarch32
+
+vector_entry workaround_bpiall_vbar1_irq_aarch32
+ b report_unhandled_interrupt
+workaround_bpiall_vbar1_irq:
+ ldp x0, x1, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0]
+ b irq_aarch64
+ check_vector_size workaround_bpiall_vbar1_irq_aarch32
+
+vector_entry workaround_bpiall_vbar1_fiq_aarch32
+ b report_unhandled_interrupt
+workaround_bpiall_vbar1_fiq:
+ ldp x0, x1, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0]
+ b fiq_aarch64
+ check_vector_size workaround_bpiall_vbar1_fiq_aarch32
+
+vector_entry workaround_bpiall_vbar1_serror_aarch32
+ b report_unhandled_exception
+workaround_bpiall_vbar1_serror:
+ ldp x0, x1, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0]
+ b serror_aarch64
+ check_vector_size workaround_bpiall_vbar1_serror_aarch32