358 lines
10 KiB
C
358 lines
10 KiB
C
/*
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* This file is part of Luma3DS
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* Copyright (C) 2016-2019 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 "gdb/remote_command.h"
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#include "gdb/net.h"
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#include "csvc.h"
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#include "fmt.h"
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#include "gdb/breakpoints.h"
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struct
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{
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const char *name;
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GDBCommandHandler handler;
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} remoteCommandHandlers[] =
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{
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{ "syncrequestinfo" , GDB_REMOTE_COMMAND_HANDLER(SyncRequestInfo) },
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{ "translatehandle" , GDB_REMOTE_COMMAND_HANDLER(TranslateHandle) },
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{ "getmmuconfig" , GDB_REMOTE_COMMAND_HANDLER(GetMmuConfig) },
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{ "getmemregions" , GDB_REMOTE_COMMAND_HANDLER(GetMemRegions) },
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{ "flushcaches" , GDB_REMOTE_COMMAND_HANDLER(FlushCaches) },
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{ "toggleextmemaccess", GDB_REMOTE_COMMAND_HANDLER(ToggleExternalMemoryAccess) },
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};
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static const char *GDB_SkipSpaces(const char *pos)
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{
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const char *nextpos;
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for(nextpos = pos; *nextpos != 0 && ((*nextpos >= 9 && *nextpos <= 13) || *nextpos == ' '); nextpos++);
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return nextpos;
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}
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GDB_DECLARE_REMOTE_COMMAND_HANDLER(SyncRequestInfo)
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{
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char outbuf[GDB_BUF_LEN / 2 + 1];
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Result r;
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int n;
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if(ctx->commandData[0] != 0)
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return GDB_ReplyErrno(ctx, EILSEQ);
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if(ctx->selectedThreadId == 0)
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ctx->selectedThreadId = ctx->currentThreadId;
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if(ctx->selectedThreadId == 0)
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{
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n = sprintf(outbuf, "Cannot run this command without a selected thread.\n");
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goto end;
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}
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u32 id;
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u32 cmdId;
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ThreadContext regs;
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u32 instr;
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Handle process;
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r = svcOpenProcess(&process, ctx->pid);
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if(R_FAILED(r))
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{
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n = sprintf(outbuf, "Invalid process (wtf?)\n");
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goto end;
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}
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for(id = 0; id < MAX_DEBUG_THREAD && ctx->threadInfos[id].id != ctx->selectedThreadId; id++);
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r = svcGetDebugThreadContext(®s, ctx->debug, ctx->selectedThreadId, THREADCONTEXT_CONTROL_CPU_REGS);
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if(R_FAILED(r) || id == MAX_DEBUG_THREAD)
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{
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n = sprintf(outbuf, "Invalid or running thread.\n");
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goto end;
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}
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r = svcReadProcessMemory(&cmdId, ctx->debug, ctx->threadInfos[id].tls + 0x80, 4);
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if(R_FAILED(r))
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{
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n = sprintf(outbuf, "Invalid or running thread.\n");
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goto end;
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}
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r = svcReadProcessMemory(&instr, ctx->debug, regs.cpu_registers.pc, (regs.cpu_registers.cpsr & 0x20) ? 2 : 4);
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if(R_SUCCEEDED(r) && (((regs.cpu_registers.cpsr & 0x20) && instr == BREAKPOINT_INSTRUCTION_THUMB) || instr == BREAKPOINT_INSTRUCTION_ARM))
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{
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u32 savedInstruction;
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if(GDB_GetBreakpointInstruction(&savedInstruction, ctx, regs.cpu_registers.pc) == 0)
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instr = savedInstruction;
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}
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if(R_FAILED(r) || ((regs.cpu_registers.cpsr & 0x20) && !(instr == 0xDF32 || (instr == 0xDFFE && regs.cpu_registers.r[12] == 0x32)))
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|| (!(regs.cpu_registers.cpsr & 0x20) && !(instr == 0xEF000032 || (instr == 0xEF0000FE && regs.cpu_registers.r[12] == 0x32))))
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{
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n = sprintf(outbuf, "The selected thread is not currently performing a sync request (svc 0x32).\n");
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goto end;
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}
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char name[12];
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Handle handle;
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r = svcCopyHandle(&handle, CUR_PROCESS_HANDLE, (Handle)regs.cpu_registers.r[0], process);
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if(R_FAILED(r))
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{
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n = sprintf(outbuf, "Invalid handle.\n");
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goto end;
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}
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r = svcControlService(SERVICEOP_GET_NAME, name, handle);
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if(R_FAILED(r))
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name[0] = 0;
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n = sprintf(outbuf, "%s 0x%lx, 0x%08lx\n", name, cmdId, ctx->threadInfos[id].tls + 0x80);
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end:
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svcCloseHandle(handle);
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svcCloseHandle(process);
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return GDB_SendHexPacket(ctx, outbuf, n);
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}
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GDB_DECLARE_REMOTE_COMMAND_HANDLER(TranslateHandle)
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{
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bool ok;
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u32 val;
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char *end;
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int n;
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Result r;
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u32 kernelAddr;
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Handle handle, process;
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s64 refcountRaw;
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u32 refcount;
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char classBuf[32], serviceBuf[12] = { 0 };
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char outbuf[GDB_BUF_LEN / 2 + 1];
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if(ctx->commandData[0] == 0)
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return GDB_ReplyErrno(ctx, EILSEQ);
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val = xstrtoul(ctx->commandData, &end, 0, true, &ok);
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if(!ok)
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return GDB_ReplyErrno(ctx, EILSEQ);
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end = (char *)GDB_SkipSpaces(end);
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if(*end != 0)
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return GDB_ReplyErrno(ctx, EILSEQ);
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r = svcOpenProcess(&process, ctx->pid);
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if(R_FAILED(r))
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{
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n = sprintf(outbuf, "Invalid process (wtf?)\n");
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goto end;
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}
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r = svcCopyHandle(&handle, CUR_PROCESS_HANDLE, (Handle)val, process);
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if(R_FAILED(r))
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{
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n = sprintf(outbuf, "Invalid handle.\n");
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goto end;
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}
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svcTranslateHandle(&kernelAddr, classBuf, handle);
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svcGetHandleInfo(&refcountRaw, handle, 1);
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svcControlService(SERVICEOP_GET_NAME, serviceBuf, handle);
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refcount = (u32)(refcountRaw - 1);
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if(serviceBuf[0] != 0)
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n = sprintf(outbuf, "(%s *)0x%08lx /* %s handle, %lu %s */\n", classBuf, kernelAddr, serviceBuf, refcount, refcount == 1 ? "reference" : "references");
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else
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n = sprintf(outbuf, "(%s *)0x%08lx /* %lu %s */\n", classBuf, kernelAddr, refcount, refcount == 1 ? "reference" : "references");
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end:
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svcCloseHandle(handle);
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svcCloseHandle(process);
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return GDB_SendHexPacket(ctx, outbuf, n);
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}
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extern bool isN3DS;
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GDB_DECLARE_REMOTE_COMMAND_HANDLER(GetMmuConfig)
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{
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int n;
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char outbuf[GDB_BUF_LEN / 2 + 1];
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Result r;
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Handle process;
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if(ctx->commandData[0] != 0)
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return GDB_ReplyErrno(ctx, EILSEQ);
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r = svcOpenProcess(&process, ctx->pid);
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if(R_FAILED(r))
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n = sprintf(outbuf, "Invalid process (wtf?)\n");
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else
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{
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s64 TTBCR, TTBR0;
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svcGetSystemInfo(&TTBCR, 0x10002, 0);
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svcGetProcessInfo(&TTBR0, process, 0x10008);
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n = sprintf(outbuf, "TTBCR = %lu\nTTBR0 = 0x%08lx\nTTBR1 =", (u32)TTBCR, (u32)TTBR0);
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for(u32 i = 0; i < (isN3DS ? 4 : 2); i++)
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{
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s64 TTBR1;
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svcGetSystemInfo(&TTBR1, 0x10002, 1 + i);
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if(i == (isN3DS ? 3 : 1))
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n += sprintf(outbuf + n, " 0x%08lx\n", (u32)TTBR1);
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else
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n += sprintf(outbuf + n, " 0x%08lx /", (u32)TTBR1);
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}
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svcCloseHandle(process);
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}
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return GDB_SendHexPacket(ctx, outbuf, n);
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}
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static const char *FormatMemPerm(u32 perm)
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{
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if (perm == MEMPERM_DONTCARE)
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return "???";
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static char buf[4] = {0};
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buf[0] = perm & MEMPERM_READ ? 'r' : '-';
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buf[1] = perm & MEMPERM_WRITE ? 'w' : '-';
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buf[2] = perm & MEMPERM_EXECUTE ? 'x' : '-';
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return buf;
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}
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static const char *FormatMemState(u32 state)
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{
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if (state > 11)
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return "Unknown";
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static const char *states[12] =
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{
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"Free",
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"Reserved",
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"IO",
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"Static",
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"Code",
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"Private",
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"Shared",
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"Continuous",
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"Aliased",
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"Alias",
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"AliasCode",
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"Locked"
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};
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return states[state];
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}
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GDB_DECLARE_REMOTE_COMMAND_HANDLER(GetMemRegions)
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{
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u32 address = 0;
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u32 posInBuffer = 0;
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u32 maxPosInBuffer = GDB_BUF_LEN / 2 - 35; ///< 35 is the maximum length of a formatted region
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Handle handle;
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MemInfo memi;
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PageInfo pagei;
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char outbuf[GDB_BUF_LEN / 2 + 1];
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if(R_FAILED(svcOpenProcess(&handle, ctx->pid)))
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{
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posInBuffer = sprintf(outbuf, "Invalid process (wtf?)\n");
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goto end;
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}
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while (address < 0x40000000 ///< Limit to check for regions
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&& posInBuffer < maxPosInBuffer
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&& R_SUCCEEDED(svcQueryProcessMemory(&memi, &pagei, handle, address)))
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{
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// Update the address for next region
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address = memi.base_addr + memi.size;
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// If region isn't FREE then add it to the list
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if (memi.state != MEMSTATE_FREE)
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{
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const char *perm = FormatMemPerm(memi.perm);
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const char *state = FormatMemState(memi.state);
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posInBuffer += sprintf(outbuf + posInBuffer, "%08lx - %08lx %s %s\n",
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memi.base_addr, address, perm, state);
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}
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}
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svcCloseHandle(handle);
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end:
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return GDB_SendHexPacket(ctx, outbuf, posInBuffer);
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}
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GDB_DECLARE_REMOTE_COMMAND_HANDLER(FlushCaches)
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{
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if(ctx->commandData[0] != 0)
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return GDB_ReplyErrno(ctx, EILSEQ);
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svcFlushEntireDataCache();
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svcInvalidateEntireInstructionCache();
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return GDB_ReplyOk(ctx);
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}
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GDB_DECLARE_REMOTE_COMMAND_HANDLER(ToggleExternalMemoryAccess)
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{
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int n;
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char outbuf[GDB_BUF_LEN / 2 + 1];
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ctx->enableExternalMemoryAccess = !ctx->enableExternalMemoryAccess;
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n = sprintf(outbuf, "External memory access %s successfully.\n", ctx->enableExternalMemoryAccess ? "enabled" : "disabled");
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return GDB_SendHexPacket(ctx, outbuf, n);
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}
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GDB_DECLARE_QUERY_HANDLER(Rcmd)
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{
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char commandData[GDB_BUF_LEN / 2 + 1];
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char *endpos;
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const char *errstr = "Unrecognized command.\n";
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u32 len = strlen(ctx->commandData);
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if(len == 0 || (len % 2) == 1 || GDB_DecodeHex(commandData, ctx->commandData, len / 2) != len / 2)
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return GDB_ReplyErrno(ctx, EILSEQ);
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commandData[len / 2] = 0;
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for(endpos = commandData; !(*endpos >= 9 && *endpos <= 13) && *endpos != ' ' && *endpos != 0; endpos++);
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char *nextpos = (char *)GDB_SkipSpaces(endpos);
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*endpos = 0;
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for(u32 i = 0; i < sizeof(remoteCommandHandlers) / sizeof(remoteCommandHandlers[0]); i++)
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{
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if(strcmp(commandData, remoteCommandHandlers[i].name) == 0)
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{
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ctx->commandData = nextpos;
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return remoteCommandHandlers[i].handler(ctx);
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}
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}
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return GDB_SendHexPacket(ctx, errstr, strlen(errstr));
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}
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