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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/openjdk-multiarch-jdk8u
 Path: blob/aarch64-shenandoah-jdk8u272-b10/hotspot/src/os_cpu/bsd_aarch64/vm/tcg-apple-jit.h
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/*

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 * Apple Silicon APRR functions for JIT handling

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 *

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 * Copyright (c) 2020 osy

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 *

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 * This library is free software; you can redistribute it and/or

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 * modify it under the terms of the GNU Lesser General Public

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 * License as published by the Free Software Foundation; either

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 * version 2.1 of the License, or (at your option) any later version.

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 *

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 * This library is distributed in the hope that it will be useful,

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 * but WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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 * Lesser General Public License for more details.

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 *

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 * You should have received a copy of the GNU Lesser General Public

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 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

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 */

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/*

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 * Credits to: https://siguza.github.io/APRR/

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 * Reversed from /usr/lib/system/libsystem_pthread.dylib

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 */

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#ifndef TCG_APPLE_JIT_H

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#define TCG_APPLE_JIT_H

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#if defined(__aarch64__) && defined(__APPLE__)

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#define _COMM_PAGE_START_ADDRESS        (0x0000000FFFFFC000ULL) /* In TTBR0 */

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#define _COMM_PAGE_APRR_SUPPORT         (_COMM_PAGE_START_ADDRESS + 0x10C)

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#define _COMM_PAGE_APPR_WRITE_ENABLE    (_COMM_PAGE_START_ADDRESS + 0x110)

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#define _COMM_PAGE_APRR_WRITE_DISABLE   (_COMM_PAGE_START_ADDRESS + 0x118)

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static __attribute__((__always_inline__)) bool jit_write_protect_supported(void)

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{

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    /* Access shared kernel page at fixed memory location. */

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    uint8_t aprr_support = *(volatile uint8_t *)_COMM_PAGE_APRR_SUPPORT;

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    return aprr_support > 0;

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}

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/* write protect enable = write disable */

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static __attribute__((__always_inline__)) void jit_write_protect(int enabled)

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{

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    /* Access shared kernel page at fixed memory location. */

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    uint8_t aprr_support = *(volatile uint8_t *)_COMM_PAGE_APRR_SUPPORT;

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    if (aprr_support == 0 || aprr_support > 3) {

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        return;

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    } else if (aprr_support == 1) {

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        __asm__ __volatile__ (

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            "mov x0, %0\n"

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            "ldr x0, [x0]\n"

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            "msr S3_4_c15_c2_7, x0\n"

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            "isb sy\n"

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            :: "r" (enabled ? _COMM_PAGE_APRR_WRITE_DISABLE

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                            : _COMM_PAGE_APPR_WRITE_ENABLE)

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            : "memory", "x0"

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        );

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    } else {

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        __asm__ __volatile__ (

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            "mov x0, %0\n"

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            "ldr x0, [x0]\n"

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            "msr S3_6_c15_c1_5, x0\n"

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            "isb sy\n"

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            :: "r" (enabled ? _COMM_PAGE_APRR_WRITE_DISABLE

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                            : _COMM_PAGE_APPR_WRITE_ENABLE)

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            : "memory", "x0"

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        );

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    }

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}

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#else /* defined(__aarch64__) && defined(__APPLE__) */

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static __attribute__((__always_inline__)) bool jit_write_protect_supported(void)

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{

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    return false;

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}

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static __attribute__((__always_inline__)) void jit_write_protect(int enabled)

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{

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}

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#endif

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#endif /* define TCG_APPLE_JIT_H */

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