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Merge "fix(smccc): check smc_fid [23:17] bits" into integration

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This commit is contained in:
Manish V Badarkhe 2023-03-21 16:07:14 +01:00 • committed by TrustedFirmware Code Review
commit 0e7d97d037
2 changed files with 22 additions and 8 deletions
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14
bl31/aarch64/runtime_exceptions.S
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@ -506,6 +506,17 @@ sync_handler64:
/* Copy SCR_EL3.NS bit to the flag to indicate caller's security */
bfi x7, x18, #0, #1
mov sp, x12
/*
* Per SMCCC documentation, bits [23:17] must be zero for Fast
* SMCs. Other values are reserved for future use. Ensure that
* these bits are zeroes, if not report as unknown SMC.
*/
tbz x0, #FUNCID_TYPE_SHIFT, 2f /* Skip check if its a Yield Call*/
tst x0, #(FUNCID_FC_RESERVED_MASK << FUNCID_FC_RESERVED_SHIFT)
b.ne smc_unknown
/*
* Per SMCCCv1.3 a caller can set the SVE hint bit in the SMC FID
* passed through x0. Copy the SVE hint bit to flags and mask the
@ -513,11 +524,10 @@ sync_handler64:
* A service/dispatcher can retrieve the SVE hint bit state from
* flags using the appropriate helper.
*/
2:
bfi x7, x0, #FUNCID_SVE_HINT_SHIFT, #FUNCID_SVE_HINT_MASK
bic x0, x0, #(FUNCID_SVE_HINT_MASK << FUNCID_SVE_HINT_SHIFT)
mov sp, x12
/* Get the unique owning entity number */
ubfx x16, x0, #FUNCID_OEN_SHIFT, #FUNCID_OEN_WIDTH
ubfx x15, x0, #FUNCID_TYPE_SHIFT, #FUNCID_TYPE_WIDTH

6
include/lib/smccc.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2016-2022, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2016-2023, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -37,6 +37,10 @@
#define FUNCID_OEN_MASK U(0x3f)
#define FUNCID_OEN_WIDTH U(6)
#define FUNCID_FC_RESERVED_SHIFT U(17)
#define FUNCID_FC_RESERVED_MASK U(0x7f)
#define FUNCID_FC_RESERVED_WIDTH U(7)
#define FUNCID_SVE_HINT_SHIFT U(16)
#define FUNCID_SVE_HINT_MASK U(1)
#define FUNCID_SVE_HINT_WIDTH U(1)