mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
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112 lines
4.0 KiB
C++
112 lines
4.0 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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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#include <stratosphere.hpp>
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namespace ams::ro::impl {
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namespace {
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bool SearchSegmentHead(uintptr_t *out, uintptr_t target, svc::MemoryState state) {
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svc::MemoryInfo mem_info;
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svc::PageInfo page_info;
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bool success = false;
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for (uintptr_t cur = target; cur <= target; cur = mem_info.base_address - 1) {
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R_ABORT_UNLESS(svc::QueryMemory(std::addressof(mem_info), std::addressof(page_info), cur));
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if (mem_info.state != state || mem_info.permission != svc::MemoryPermission_ReadExecute) {
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break;
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}
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*out = mem_info.base_address;
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success = true;
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}
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return success;
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}
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bool SearchSegmentTail(uintptr_t *out, uintptr_t target, svc::MemoryState state) {
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svc::MemoryInfo mem_info;
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svc::PageInfo page_info;
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bool success = false;
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for (uintptr_t cur = target; cur >= target; cur = mem_info.base_address + mem_info.size) {
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R_ABORT_UNLESS(svc::QueryMemory(std::addressof(mem_info), std::addressof(page_info), cur));
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if (mem_info.state != state) {
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break;
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}
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*out = mem_info.base_address + mem_info.size - 1;
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success = true;
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}
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return success;
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}
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bool QueryModule(uintptr_t *out_address, size_t *out_size, uintptr_t pc) {
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/* Query the program counter. */
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svc::MemoryInfo mem_info;
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svc::PageInfo page_info;
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R_ABORT_UNLESS(svc::QueryMemory(std::addressof(mem_info), std::addressof(page_info), pc));
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/* Check memory info. */
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if (mem_info.permission != svc::MemoryPermission_ReadExecute) {
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return false;
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}
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if (mem_info.state != svc::MemoryState_Code && mem_info.state != svc::MemoryState_AliasCode) {
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return false;
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}
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/* Find head/tail. */
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uintptr_t head = 0, tail = 0;
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AMS_ABORT_UNLESS(SearchSegmentHead(std::addressof(head), pc, mem_info.state));
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AMS_ABORT_UNLESS(SearchSegmentTail(std::addressof(tail), pc, mem_info.state));
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AMS_ABORT_UNLESS(SearchSegmentTail(std::addressof(tail), tail + 1, mem_info.state == svc::MemoryState_Code ? svc::MemoryState_CodeData : svc::MemoryState_AliasCodeData));
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/* Set output. */
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*out_address = head;
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*out_size = tail + 1 - head;
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return true;
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}
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}
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bool GetExceptionInfo(ExceptionInfo *out, uintptr_t pc) {
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/* Check pre-conditions. */
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AMS_ASSERT(out != nullptr);
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/* Find the module. */
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if (!QueryModule(std::addressof(out->module_address), std::addressof(out->module_size), pc)) {
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return false;
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}
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/* Validate the module. */
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rocrt::ModuleHeaderLocation *loc = reinterpret_cast<rocrt::ModuleHeaderLocation *>(out->module_address);
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rocrt::ModuleHeader *header = rocrt::GetModuleHeader(loc);
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AMS_ABORT_UNLESS(header->signature == rocrt::ModuleHeaderVersion);
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/* Set the exception info. */
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out->info_offset = loc->header_offset + header->exception_info_start_offset;
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out->info_size = header->exception_info_end_offset - header->exception_info_start_offset;
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return true;
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}
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}
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