/* * Copyright (c) 2021 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
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*/
#include <libsa/string.h>
#include <mach/vm_types.h>
#include <machine/static_if.h>
void
ml_static_if_entry_patch(static_if_entry_t sie, int branch)
{
uint8_t insn[STATIC_IF_INSN_SIZE] = { 0x0F, 0x1F, 0x44, 0x00 };
vm_offset_t patch_point = __static_if_entry_patch_point(sie);
if (branch) {
int32_t delta = (int32_t)(sie->sie_target -
(sie->sie_base + STATIC_IF_INSN_SIZE));
insn[0] = 0xE9; /* jmp 32 */
memcpy(insn + 1, &delta, sizeof(delta));
}
bcopy(insn, (void *)patch_point, STATIC_IF_INSN_SIZE);
}
void
ml_static_if_flush_icache(void)
{
}