diff --git a/bl32/tsp/aarch64/tsp_entrypoint.S b/bl32/tsp/aarch64/tsp_entrypoint.S index 641f37f..260dcc6 100644 --- a/bl32/tsp/aarch64/tsp_entrypoint.S +++ b/bl32/tsp/aarch64/tsp_entrypoint.S @@ -97,7 +97,7 @@ * Set the exception vector to something sane. * --------------------------------------------- */ - adr x0, early_exceptions + adr x0, tsp_exceptions msr vbar_el1, x0 /* --------------------------------------------- @@ -196,7 +196,7 @@ * Set the exception vector to something sane. * --------------------------------------------- */ - adr x0, early_exceptions + adr x0, tsp_exceptions msr vbar_el1, x0 /* --------------------------------------------- diff --git a/bl32/tsp/aarch64/tsp_exceptions.S b/bl32/tsp/aarch64/tsp_exceptions.S new file mode 100644 index 0000000..ccb4cdd --- /dev/null +++ b/bl32/tsp/aarch64/tsp_exceptions.S @@ -0,0 +1,200 @@ +/* + * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include +#include +#include +#include + + + /* ---------------------------------------------------- + * The caller-saved registers x0-x18 and LR are saved + * here. + * ---------------------------------------------------- + */ + +#define SCRATCH_REG_SIZE #(20 * 8) + + .macro save_caller_regs_and_lr + sub sp, sp, SCRATCH_REG_SIZE + stp x0, x1, [sp] + stp x2, x3, [sp, #0x10] + stp x4, x5, [sp, #0x20] + stp x6, x7, [sp, #0x30] + stp x8, x9, [sp, #0x40] + stp x10, x11, [sp, #0x50] + stp x12, x13, [sp, #0x60] + stp x14, x15, [sp, #0x70] + stp x16, x17, [sp, #0x80] + stp x18, x30, [sp, #0x90] + .endm + + .macro restore_caller_regs_and_lr + ldp x0, x1, [sp] + ldp x2, x3, [sp, #0x10] + ldp x4, x5, [sp, #0x20] + ldp x6, x7, [sp, #0x30] + ldp x8, x9, [sp, #0x40] + ldp x10, x11, [sp, #0x50] + ldp x12, x13, [sp, #0x60] + ldp x14, x15, [sp, #0x70] + ldp x16, x17, [sp, #0x80] + ldp x18, x30, [sp, #0x90] + add sp, sp, SCRATCH_REG_SIZE + .endm + + .globl tsp_exceptions + + /* ----------------------------------------------------- + * TSP exception handlers. + * ----------------------------------------------------- + */ + .section .vectors, "ax"; .align 11 + + .align 7 +tsp_exceptions: + /* ----------------------------------------------------- + * Current EL with _sp_el0 : 0x0 - 0x180. No exceptions + * are expected and treated as irrecoverable errors. + * ----------------------------------------------------- + */ +sync_exception_sp_el0: + wfi + b sync_exception_sp_el0 + check_vector_size sync_exception_sp_el0 + + .align 7 + +irq_sp_el0: + b irq_sp_el0 + check_vector_size irq_sp_el0 + + .align 7 +fiq_sp_el0: + b fiq_sp_el0 + check_vector_size fiq_sp_el0 + + .align 7 +serror_sp_el0: + b serror_sp_el0 + check_vector_size serror_sp_el0 + + + /* ----------------------------------------------------- + * Current EL with SPx: 0x200 - 0x380. Only IRQs/FIQs + * are expected and handled + * ----------------------------------------------------- + */ + .align 7 +sync_exception_sp_elx: + wfi + b sync_exception_sp_elx + check_vector_size sync_exception_sp_elx + + .align 7 +irq_sp_elx: + b irq_sp_elx + check_vector_size irq_sp_elx + + .align 7 +fiq_sp_elx: + save_caller_regs_and_lr + bl tsp_fiq_handler + cbz x0, fiq_sp_elx_done + + /* + * This FIQ was not targetted to S-EL1 so send it to + * the monitor and wait for execution to resume. + */ + smc #0 +fiq_sp_elx_done: + restore_caller_regs_and_lr + eret + check_vector_size fiq_sp_elx + + .align 7 +serror_sp_elx: + b serror_sp_elx + check_vector_size serror_sp_elx + + + /* ----------------------------------------------------- + * Lower EL using AArch64 : 0x400 - 0x580. No exceptions + * are handled since TSP does not implement a lower EL + * ----------------------------------------------------- + */ + .align 7 +sync_exception_aarch64: + wfi + b sync_exception_aarch64 + check_vector_size sync_exception_aarch64 + + .align 7 +irq_aarch64: + b irq_aarch64 + check_vector_size irq_aarch64 + + .align 7 +fiq_aarch64: + b fiq_aarch64 + check_vector_size fiq_aarch64 + + .align 7 +serror_aarch64: + b serror_aarch64 + check_vector_size serror_aarch64 + + + /* ----------------------------------------------------- + * Lower EL using AArch32 : 0x600 - 0x780. No exceptions + * handled since the TSP does not implement a lower EL. + * ----------------------------------------------------- + */ + .align 7 +sync_exception_aarch32: + wfi + b sync_exception_aarch32 + check_vector_size sync_exception_aarch32 + + .align 7 +irq_aarch32: + b irq_aarch32 + check_vector_size irq_aarch32 + + .align 7 +fiq_aarch32: + b fiq_aarch32 + check_vector_size fiq_aarch32 + + .align 7 +serror_aarch32: + b serror_aarch32 + check_vector_size serror_aarch32 + .align 7 diff --git a/bl32/tsp/tsp.mk b/bl32/tsp/tsp.mk index 297556b..b9084d5 100644 --- a/bl32/tsp/tsp.mk +++ b/bl32/tsp/tsp.mk @@ -30,6 +30,7 @@ BL32_SOURCES += bl32/tsp/tsp_main.c \ bl32/tsp/aarch64/tsp_entrypoint.S \ + bl32/tsp/aarch64/tsp_exceptions.S \ bl32/tsp/aarch64/tsp_request.S \ bl32/tsp/tsp_interrupt.c \ bl32/tsp/tsp_timer.c \