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thermosphere: add some basic sysreg trapping code

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TuxSH 2019-07-25 01:29:17 +02:00
parent 1db0502b35
commit ffa216c8c7
6 changed files with 236 additions and 2 deletions
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27
thermosphere/src/synchronization.h Normal file
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@ -0,0 +1,27 @@
/*
* Copyright (c) 2019 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/>.
*/
#pragma once
static inline void __dsb_sy(void)
{
__asm__ __volatile__ ("dsb sy" ::: "memory");
}
static inline void __isb(void)
{
__asm__ __volatile__ ("isb" ::: "memory");
}

13
thermosphere/src/sysreg.h
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@ -403,6 +403,9 @@
#define MAKE_MSR(name, Rt) (0xD5000000 | ENCODE_SYSREG_MOV(name) | ((Rt) & 0x1F))
#define MAKE_MRS(name, Rt) (0xD5200000 | ENCODE_SYSREG_MOV(name) | ((Rt) & 0x1F))
#define MAKE_MSR_FROM_FIELDS(op0, op1, crn, crm, op2, Rt) (0xD5000000 | ENCODE_SYSREG_FIELDS_MOV(op0, op1, crn, crm, op2) | ((Rt) & 0x1F))
#define MAKE_MRS_FROM_FIELDS(op0, op1, crn, crm, op2, Rt) (0xD5200000 | ENCODE_SYSREG_FIELDS_MOV(op0, op1, crn, crm, op2) | ((Rt) & 0x1F))
#define ENCODE_SYSREG_FIELDS_ISS(op0, op1, crn, crm, op2) (((op0) << 20) | ((op2) << 17) | ((op1) << 14) | ((crn) << 10) | ((crm) << 1))
#define ENCODE_SYSREG_ISS(name) EVAL(ENCODE_SYSREG_FIELDS_ISS CAT(TUP_, name))
@ -413,3 +416,13 @@
})
#define SET_SYSREG(reg, val) do { u64 temp_reg = (val); __asm__ __volatile__ ("msr " #reg ", %0" :: "r"(temp_reg) : "memory"); } while(false)
#define SYSREG_OP1_AARCH32_AUTO 0
#define SYSREG_OP1_AARCH64_EL1 0
#define SYSREG_OP1_CACHE 1
#define SYSREG_OP1_CACHESZSEL 2
#define SYSREG_OP1_EL0 3
#define SYSREG_OP1_EL2 4
#define SYSREG_OP1_EL3 6
#define SYSREG_OP1_AARCH32_JZL 7
#define SYSREG_OP1_AARCH64_SEL1 7

138
thermosphere/src/sysreg_traps.c Normal file
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@ -0,0 +1,138 @@
/*
* Copyright (c) 2019 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/>.
*/
#include "sysreg_traps.h"
#include "synchronization.h"
#include "sysreg.h"
// For a32 mcr/mrc => a64 mrs
u32 convertMcrMrcIss(u32 *outCondition, u32 a32Iss, u32 coproc, u32 el)
{
// NOTE: MCRR / MRRC do NOT map for the most part and need to be handled separately
//u32 direction = a32Iss & 1;
//u32 opc2 = (a32Iss >> 17) & 7;
u32 opc1 = (a32Iss >> 14) & 7;
u32 CRn = (a32Iss >> 10) & 15;
//u32 Rt = (a32Iss >> 5) & 31;
//u32 CRm = (a32Iss >> 1) & 15;
bool condValid = (a32Iss & BIT(24)) != 0;
*outCondition = condValid ? ((a32Iss >> 20) & 15): 14; // use "unconditional" by default
u32 op0 = (16 - coproc) & 3;
u32 op1;
// Do NOT translate cp15, 0, c7-8 (Cache, and resp. TLB maintenance coproc regs) as they don't map to Aarch64
if (coproc == 15 && (CRn == 7 || CRn == 8)) {
return -2;
}
// The difficult part
switch (opc1) {
case SYSREG_OP1_AARCH32_AUTO: {
switch (el) {
case 0:
op1 = SYSREG_OP1_EL0;
break;
case 1:
op1 = SYSREG_OP1_AARCH64_EL1;
break;
case 2:
op1 = SYSREG_OP1_EL2;
break;
case 3:
op1 = SYSREG_OP1_EL3;
break;
default:
return -1;
}
break;
}
case SYSREG_OP1_EL0:
case SYSREG_OP1_EL2:
case SYSREG_OP1_EL3:
case SYSREG_OP1_CACHE:
case SYSREG_OP1_CACHESZSEL:
op1 = opc1;
break;
// We shouldn't even trap those to begin with.
case SYSREG_OP1_AARCH32_JZL:
default:
return -1;
}
// Everything but op0 is at its correct place & only op1 needs to be replaced
return (a32Iss & ~(MASK2(24, 20) | MASK2(16, 14))) | (op0 << 20) | (op1 << 14);
}
static void doSystemRegisterRwImpl(u64 *val, u32 iss)
{
u32 op0 = (iss >> 20) & 3;
u32 op2 = (iss >> 17) & 7;
u32 op1 = (iss >> 14) & 7;
u32 CRn = (iss >> 10) & 15;
//u32 Rt = (iss >> 5) & 31;
u32 CRm = (iss >> 1) & 15;
u32 dir = iss & 1;
u32 codebuf[] = {
0, // TBD
0xD65F03C0, // ret
};
codebuf[0] = dir ? MAKE_MRS_FROM_FIELDS(op0, op1, CRn, CRm, op2, 0) : MAKE_MSR_FROM_FIELDS(op0, op1, CRn, CRm, op2, 0);
__dsb_sy();
__isb();
*val = ((u64 (*)(u64))codebuf)(*val);
}
void doSystemRegisterRead(ExceptionStackFrame *frame, u32 iss, u32 reg1, u32 reg2)
{
// reg1 != reg2: mrrc/mcrr
u64 val = 0;
doSystemRegisterRwImpl(&val, iss | 1);
if (reg1 == reg2) {
frame->x[reg1] = val;
} else {
frame->x[reg1] = val & 0xFFFFFFFF;
frame->x[reg2] = val >> 32;
}
// Sysreg access are always 4 bit in length even for Aarch32
frame->elr_el2 += 4;
}
void doSystemRegisterWrite(ExceptionStackFrame *frame, u32 iss, u32 reg1, u32 reg2)
{
// reg1 != reg2: mrrc/mcrr
u64 val = frame->x[reg1];
if (reg1 != reg2) {
val = (val << 32) >> 32;
val |= frame->x[reg2] << 32;
}
doSystemRegisterRwImpl(&val, iss & ~1);
// Sysreg access are always 4 bit in length even for Aarch32
frame->elr_el2 += 4;
}

23
thermosphere/src/sysreg_traps.h Normal file
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@ -0,0 +1,23 @@
/*
* Copyright (c) 2019 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/>.
*/
#pragma once
#include "traps.h"
void doSystemRegisterRead(ExceptionStackFrame *frame, u32 iss, u32 reg1, u32 reg2);
void doSystemRegisterWrite(ExceptionStackFrame *frame, u32 iss, u32 reg1, u32 reg2);

32
thermosphere/src/traps.c
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@ -1,5 +1,35 @@
/*
* Copyright (c) 2019 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/>.
*/
#include "traps.h"
#include "sysreg.h"
#include "synchronization.h"
static void enableDebugTraps(void)
{
u64 mdcr = GET_SYSREG(mdcr_el2);
// Trap Debug Exceptions, and accesses to debug registers.
mdcr |= MDCR_EL2_TDE;
// Implied from TDE
mdcr |= MDCR_EL2_TDRA | MDCR_EL2_TDOSA | MDCR_EL2_TDA;
SET_SYSREG(mdcr_el2, mdcr);
}
void enableTraps(void)
{
@ -17,4 +47,6 @@ void enableTraps(void)
// TODO debug exceptions
SET_SYSREG(hcr_el2, hcr);
enableDebugTraps();
}

1
thermosphere/src/traps.h
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@ -17,5 +17,6 @@
#pragma once
#include "utils.h"
#include "exceptions.h"
void enableTraps(void);