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fix(fconf): boot fails using ARM_ARCH_MINOR=8

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When building TF-A (with SPMD support) with ARM_ARCH_MAJOR=8/
ARCH_ARCH_MINOR=8 options, this forces the -march=armv8.8-a compiler
option. In this condition, the compiler optimises statement [1] into
a store pair to an unaligned address resulting to a supposedly alignment
fault. With -march=armv8.7-a and earlier the compiler resolves with a
memcpy. Replacing this line by an explicit memcpy masks out the issue.
Prefer using the plain struct uuid in place of the uuid_helper union
for further clarity.

[1] https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/
plat/arm/common/fconf/arm_fconf_sp.c?h=v2.10#n77

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I509b7bc50c7c4a894885d24dc8279d0fe634e8f2
This commit is contained in:
Olivier Deprez 2024-01-08 20:57:36 +01:00
parent 99db13bfaa
commit 0c86a846d9
1 changed files with 16 additions and 14 deletions
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30
plat/arm/common/fconf/arm_fconf_sp.c
View file

@ -1,10 +1,11 @@
/*
* Copyright (c) 2020-2022, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2020-2024, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <string.h>
#include <common/debug.h>
#include <common/desc_image_load.h>
@ -27,7 +28,7 @@ struct arm_sp_t arm_sp;
int fconf_populate_arm_sp(uintptr_t config)
{
int sp_node, node, err;
union uuid_helper_t uuid_helper;
struct uuid uuid;
unsigned int index = 0;
uint32_t val32;
const unsigned int sip_start = SP_PKG1_ID;
@ -68,13 +69,14 @@ int fconf_populate_arm_sp(uintptr_t config)
/* Read UUID */
err = fdtw_read_uuid(dtb, sp_node, "uuid", 16,
(uint8_t *)&uuid_helper);
(uint8_t *)&uuid);
if (err < 0) {
ERROR("FCONF: cannot read SP uuid\n");
return -1;
}
arm_sp.uuids[index] = uuid_helper;
memcpy_s(&arm_sp.uuids[index].uuid_struct, sizeof(struct uuid),
&uuid, sizeof(struct uuid));
/* Read Load address */
err = fdt_read_uint32(dtb, sp_node, "load-address", &val32);
@ -88,16 +90,16 @@ int fconf_populate_arm_sp(uintptr_t config)
" %02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x"
" load_addr=%lx\n",
__func__,
uuid_helper.uuid_struct.time_low[0], uuid_helper.uuid_struct.time_low[1],
uuid_helper.uuid_struct.time_low[2], uuid_helper.uuid_struct.time_low[3],
uuid_helper.uuid_struct.time_mid[0], uuid_helper.uuid_struct.time_mid[1],
uuid_helper.uuid_struct.time_hi_and_version[0],
uuid_helper.uuid_struct.time_hi_and_version[1],
uuid_helper.uuid_struct.clock_seq_hi_and_reserved,
uuid_helper.uuid_struct.clock_seq_low,
uuid_helper.uuid_struct.node[0], uuid_helper.uuid_struct.node[1],
uuid_helper.uuid_struct.node[2], uuid_helper.uuid_struct.node[3],
uuid_helper.uuid_struct.node[4], uuid_helper.uuid_struct.node[5],
uuid.time_low[0], uuid.time_low[1],
uuid.time_low[2], uuid.time_low[3],
uuid.time_mid[0], uuid.time_mid[1],
uuid.time_hi_and_version[0],
uuid.time_hi_and_version[1],
uuid.clock_seq_hi_and_reserved,
uuid.clock_seq_low,
uuid.node[0], uuid.node[1],
uuid.node[2], uuid.node[3],
uuid.node[4], uuid.node[5],
arm_sp.load_addr[index]);
/* Read owner field only for dualroot CoT */