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kern: patch svc tables via asm, instead of relying on compiler to be nice

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Michael Scire 2020-07-13 19:16:05 -07:00 • committed by SciresM
parent d9e9fbe3c2
commit ef1763334b
2 changed files with 37 additions and 9 deletions
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27
mesosphere/kernel/source/arch/arm64/svc/kern_svc_tables_asm.s Normal file
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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* ams::kern::svc::PatchSvcTableEntry(void (* const*)(), unsigned int, void (*)()) */
.section .text._ZN3ams4kern3svc18PatchSvcTableEntryEPKPFvvEjS3_, "ax", %progbits
.global _ZN3ams4kern3svc18PatchSvcTableEntryEPKPFvvEjS3_
.type _ZN3ams4kern3svc18PatchSvcTableEntryEPKPFvvEjS3_, %function
_ZN3ams4kern3svc18PatchSvcTableEntryEPKPFvvEjS3_:
/* This function violates const correctness by design, to patch the svc tables. */
/* The svc tables live in .rodata (.rel.ro), but must be patched by initial constructors */
/* to support firmware-specific table entries. */
mov w1, w1
str x2, [x0, x1, lsl #3]
ret