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Atmosphere/stratosphere/dmnt.gen2/source/dmnt2_software_breakpoint.cpp

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/*
* Copyright (c) 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 <stratosphere.hpp>
#include "dmnt2_software_breakpoint.hpp"
#include "dmnt2_debug_process.hpp"
#include "dmnt2_debug_log.hpp"
namespace ams::dmnt {
namespace {
constexpr const u8 Aarch64BreakInstruction[] = {0xFF, 0xFF, 0xFF, 0xE7};
constexpr const u8 Aarch32BreakInstruction[] = {0xFE, 0xDE, 0xFF, 0xE7};
constexpr const u8 Aarch32ThumbBreakInstruction[] = {0x80, 0xB6};
}
Result SoftwareBreakPoint::Clear(DebugProcess *debug_process) {
Result result = svc::ResultInvalidArgument();
if (m_in_use) {
if (m_address) {
result = debug_process->WriteMemory(std::addressof(m_insn), m_address, m_size);
if (R_SUCCEEDED(result)) {
AMS_DMNT2_GDB_LOG_DEBUG("SoftwareBreakPoint::Clear %p 0x%lx, insn=0x%x\n", this, m_address, m_insn);
} else {
AMS_DMNT2_GDB_LOG_DEBUG("SoftwareBreakPoint::Clear %p 0x%lx, insn=0x%x, !!! Fail %08x !!!\n", this, m_address, m_insn, result.GetValue());
}
this->Reset();
} else {
AMS_DMNT2_GDB_LOG_ERROR("SoftwareBreakPoint::Clear %p 0x%lx, insn=0x%x, !!! Null Address !!!\n", this, m_address, m_insn);
}
}
R_RETURN(result);
}
Result SoftwareBreakPoint::Set(DebugProcess *debug_process, uintptr_t address, size_t size, bool is_step) {
/* Set fields. */
m_is_step = is_step;
m_address = address;
m_size = size;
/* Read our instruction. */
Result result = debug_process->ReadMemory(std::addressof(m_insn), m_address, m_size);
AMS_DMNT2_GDB_LOG_DEBUG("SoftwareBreakPoint::Set %p 0x%lx, insn=0x%x\n", this, m_address, m_insn);
/* Set the breakpoint. */
if (debug_process->Is64Bit()) {
if (m_size == sizeof(Aarch64BreakInstruction)) {
result = debug_process->WriteMemory(Aarch64BreakInstruction, m_address, m_size);
} else {
result = svc::ResultInvalidArgument();
}
} else {
if (m_size == sizeof(Aarch32BreakInstruction) || m_size == sizeof(Aarch32ThumbBreakInstruction)) {
result = debug_process->WriteMemory(m_size == sizeof(Aarch32BreakInstruction) ? Aarch32BreakInstruction : Aarch32ThumbBreakInstruction, m_address, m_size);
} else {
result = svc::ResultInvalidArgument();
}
}
/* Check that we succeeded. */
if (R_SUCCEEDED(result)) {
m_in_use = true;
}
R_RETURN(result);
}
SoftwareBreakPointManager::SoftwareBreakPointManager(DebugProcess *debug_process) : BreakPointManager(debug_process) {
/* ... */
}
BreakPointBase *SoftwareBreakPointManager::GetBreakPoint(size_t index) {
if (index < util::size(m_breakpoints)) {
return m_breakpoints + index;
} else {
return nullptr;
}
}
}