148 lines
5.2 KiB
C
148 lines
5.2 KiB
C
/*
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* This file is part of Luma3DS
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* Copyright (C) 2016-2020 Aurora Wright, TuxSH
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Additional Terms 7.b and 7.c of GPLv3 apply to this file:
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* * Requiring preservation of specified reasonable legal notices or
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* author attributions in that material or in the Appropriate Legal
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* Notices displayed by works containing it.
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* * Prohibiting misrepresentation of the origin of that material,
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* or requiring that modified versions of such material be marked in
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* reasonable ways as different from the original version.
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*/
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#include <string.h>
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#include "debug.h"
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#include "synchronization.h"
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KRecursiveLock dbgParamsLock = { NULL };
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u32 dbgParamWatchpointId, dbgParamDVA, dbgParamWCR, dbgParamContextId;
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KSchedulableInterruptEvent *enableMonitorModeDebugging(KBaseInterruptEvent *this UNUSED, u32 interruptID UNUSED)
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{
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coreBarrier();
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u32 DSCR;
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__asm__ __volatile__("mrc p14, 0, %[val], c0, c1, 0" : [val] "=r" (DSCR));
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DSCR |= 0x8000;
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c1, 0" :: [val] "r" (DSCR));
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__dsb();
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coreBarrier();
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return NULL;
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}
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static void disableWatchpoint0(void)
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{
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u32 control;
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// WCR0
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__asm__ __volatile__("mrc p14, 0, %[val], c0, c0, 7" : [val] "=r" (control));
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control &= ~1;
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c0, 7" :: [val] "r" (control));
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// BCR4
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__asm__ __volatile__("mrc p14, 0, %[val], c0, c4, 5" : [val] "=r" (control));
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control &= ~1;
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c4, 5" :: [val] "r" (control));
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}
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static void disableWatchpoint1(void)
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{
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u32 control;
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// WCR1
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__asm__ __volatile__("mrc p14, 0, %[val], c0, c1, 7" : [val] "=r" (control));
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control &= ~1;
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c1, 7" :: [val] "r" (control));
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// BCR5
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__asm__ __volatile__("mrc p14, 0, %[val], c0, c5, 5" : [val] "=r" (control));
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control &= ~1;
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c5, 5" :: [val] "r" (control));
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}
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KSchedulableInterruptEvent *disableWatchpoint(KBaseInterruptEvent *this UNUSED, u32 interruptID UNUSED)
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{
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coreBarrier();
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if(dbgParamWatchpointId == 0)
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disableWatchpoint0();
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else
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disableWatchpoint1();
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__dsb();
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coreBarrier();
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return NULL;
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}
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static void setWatchpoint0WithContextId(u32 DVA, u32 WCR, u32 contextId)
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{
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// http://infocenter.arm.com/help/topic/com.arm.doc.ddi0360f/CEGCFFDF.html
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u32 BCR =
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(1 << 21) | /* compare with context ID */
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(1 << 20) | /* linked (with a WRP in our case) */
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(0xf << 5) | /* byte address select, +0 to +3 as mandated when linking with a WRP */
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(3 << 1) | /* either privileged modes or user mode, as mandated when linking with a WRP */
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(1 << 0) ; /* enabled */
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disableWatchpoint0();
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c0, 6" :: [val] "r" (DVA));
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c4, 4" :: [val] "r" (contextId));
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c0, 7" :: [val] "r" (WCR));
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c4, 5" :: [val] "r" (BCR));
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__asm__ __volatile__("mcr p15, 0, %[val], c7, c10, 5" :: [val] "r" (0) : "memory"); // DMB
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}
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static void setWatchpoint1WithContextId(u32 DVA, u32 WCR, u32 contextId)
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{
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// http://infocenter.arm.com/help/topic/com.arm.doc.ddi0360f/CEGCFFDF.html
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u32 BCR =
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(1 << 21) | /* compare with context ID */
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(1 << 20) | /* linked (with a WRP in our case) */
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(0xf << 5) | /* byte address select, +0 to +3 as mandated when linking with a WRP */
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(3 << 1) | /* either privileged modes or user mode, as mandated when linking with a WRP */
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(1 << 0) ; /* enabled */
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disableWatchpoint1();
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c1, 6" :: [val] "r" (DVA));
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c5, 4" :: [val] "r" (contextId));
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c1, 7" :: [val] "r" (WCR));
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__asm__ __volatile__("mcr p14, 0, %[val], c0, c5, 5" :: [val] "r" (BCR));
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__asm__ __volatile__("mcr p15, 0, %[val], c7, c10, 5" :: [val] "r" (0) : "memory"); // DMB
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}
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KSchedulableInterruptEvent *setWatchpointWithContextId(KBaseInterruptEvent *this UNUSED, u32 interruptID UNUSED)
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{
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coreBarrier();
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if(dbgParamWatchpointId == 0)
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setWatchpoint0WithContextId(dbgParamDVA, dbgParamWCR, dbgParamContextId);
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else
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setWatchpoint1WithContextId(dbgParamDVA, dbgParamWCR, dbgParamContextId);
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__dsb();
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coreBarrier();
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return NULL;
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}
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