| Antonio Nino Diaz | c41f206 | 2017-10-24 10:07:35 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <asm_macros.S> |
| 9 | #include <bl_common.h> |
| 10 | #include <context.h> |
| 11 | |
| 12 | /* ----------------------------------------------------------------------------- |
| 13 | * Very simple stackless exception handlers used by the spm shim layer. |
| 14 | * ----------------------------------------------------------------------------- |
| 15 | */ |
| 16 | .globl spm_shim_exceptions_ptr |
| 17 | |
| 18 | vector_base spm_shim_exceptions_ptr, .spm_shim_exceptions |
| 19 | |
| 20 | /* ----------------------------------------------------- |
| 21 | * Current EL with SP0 : 0x0 - 0x200 |
| 22 | * ----------------------------------------------------- |
| 23 | */ |
| 24 | vector_entry SynchronousExceptionSP0, .spm_shim_exceptions |
| 25 | b . |
| 26 | check_vector_size SynchronousExceptionSP0 |
| 27 | |
| 28 | vector_entry IrqSP0, .spm_shim_exceptions |
| 29 | b . |
| 30 | check_vector_size IrqSP0 |
| 31 | |
| 32 | vector_entry FiqSP0, .spm_shim_exceptions |
| 33 | b . |
| 34 | check_vector_size FiqSP0 |
| 35 | |
| 36 | vector_entry SErrorSP0, .spm_shim_exceptions |
| 37 | b . |
| 38 | check_vector_size SErrorSP0 |
| 39 | |
| 40 | /* ----------------------------------------------------- |
| 41 | * Current EL with SPx: 0x200 - 0x400 |
| 42 | * ----------------------------------------------------- |
| 43 | */ |
| 44 | vector_entry SynchronousExceptionSPx, .spm_shim_exceptions |
| 45 | b . |
| 46 | check_vector_size SynchronousExceptionSPx |
| 47 | |
| 48 | vector_entry IrqSPx, .spm_shim_exceptions |
| 49 | b . |
| 50 | check_vector_size IrqSPx |
| 51 | |
| 52 | vector_entry FiqSPx, .spm_shim_exceptions |
| 53 | b . |
| 54 | check_vector_size FiqSPx |
| 55 | |
| 56 | vector_entry SErrorSPx, .spm_shim_exceptions |
| 57 | b . |
| 58 | check_vector_size SErrorSPx |
| 59 | |
| 60 | /* ----------------------------------------------------- |
| 61 | * Lower EL using AArch64 : 0x400 - 0x600. No exceptions |
| 62 | * are handled since secure_partition does not implement |
| 63 | * a lower EL |
| 64 | * ----------------------------------------------------- |
| 65 | */ |
| 66 | vector_entry SynchronousExceptionA64, .spm_shim_exceptions |
| 67 | msr tpidr_el1, x30 |
| 68 | mrs x30, esr_el1 |
| 69 | ubfx x30, x30, #ESR_EC_SHIFT, #ESR_EC_LENGTH |
| 70 | |
| 71 | cmp x30, #EC_AARCH64_SVC |
| 72 | b.eq do_smc |
| 73 | |
| 74 | cmp x30, #EC_AARCH32_SVC |
| 75 | b.eq do_smc |
| 76 | |
| 77 | cmp x30, #EC_AARCH64_SYS |
| 78 | b.eq handle_sys_trap |
| 79 | |
| 80 | /* Fail in all the other cases */ |
| 81 | b panic |
| 82 | |
| 83 | /* --------------------------------------------- |
| 84 | * Tell SPM that we are done initialising |
| 85 | * --------------------------------------------- |
| 86 | */ |
| 87 | do_smc: |
| 88 | mrs x30, tpidr_el1 |
| 89 | smc #0 |
| 90 | eret |
| 91 | |
| 92 | /* AArch64 system instructions trap are handled as a panic for now */ |
| 93 | handle_sys_trap: |
| 94 | panic: |
| 95 | b panic |
| 96 | check_vector_size SynchronousExceptionA64 |
| 97 | |
| 98 | vector_entry IrqA64, .spm_shim_exceptions |
| 99 | b . |
| 100 | check_vector_size IrqA64 |
| 101 | |
| 102 | vector_entry FiqA64, .spm_shim_exceptions |
| 103 | b . |
| 104 | check_vector_size FiqA64 |
| 105 | |
| 106 | vector_entry SErrorA64, .spm_shim_exceptions |
| 107 | b . |
| 108 | check_vector_size SErrorA64 |
| 109 | |
| 110 | /* ----------------------------------------------------- |
| 111 | * Lower EL using AArch32 : 0x600 - 0x800 |
| 112 | * ----------------------------------------------------- |
| 113 | */ |
| 114 | vector_entry SynchronousExceptionA32, .spm_shim_exceptions |
| 115 | b . |
| 116 | check_vector_size SynchronousExceptionA32 |
| 117 | |
| 118 | vector_entry IrqA32, .spm_shim_exceptions |
| 119 | b . |
| 120 | check_vector_size IrqA32 |
| 121 | |
| 122 | vector_entry FiqA32, .spm_shim_exceptions |
| 123 | b . |
| 124 | check_vector_size FiqA32 |
| 125 | |
| 126 | vector_entry SErrorA32, .spm_shim_exceptions |
| 127 | b . |
| 128 | check_vector_size SErrorA32 |