513 lines
17 KiB
C
513 lines
17 KiB
C
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/*
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* This file is part of Luma3DS
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* Copyright (C) 2016-2017 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/debug.h"
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#include "gdb/verbose.h"
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#include "gdb/net.h"
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#include "gdb/thread.h"
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#include "gdb/mem.h"
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#include "gdb/watchpoints.h"
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#include "fmt.h"
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#include <stdlib.h>
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#include <signal.h>
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/*
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Since we can't select particular threads to continue (and that's uncompliant behavior):
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- if we continue the current thread, continue all threads
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- otherwise, leaves all threads stopped but make the client believe it's continuing
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*/
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GDB_DECLARE_HANDLER(Detach)
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{
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ctx->state = GDB_STATE_CLOSING;
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return GDB_ReplyOk(ctx);
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}
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GDB_DECLARE_HANDLER(Kill)
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{
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ctx->state = GDB_STATE_CLOSING;
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ctx->flags |= GDB_FLAG_TERMINATE_PROCESS;
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return 0;
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}
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GDB_DECLARE_HANDLER(Break)
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{
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if(!(ctx->flags & GDB_FLAG_PROCESS_CONTINUING))
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return GDB_SendPacket(ctx, "S02", 3);
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else
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{
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ctx->flags &= ~GDB_FLAG_PROCESS_CONTINUING;
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return 0;
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}
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}
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static void GDB_ContinueExecution(GDBContext *ctx)
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{
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ctx->selectedThreadId = ctx->selectedThreadIdForContinuing = 0;
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svcContinueDebugEvent(ctx->debug, ctx->continueFlags);
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ctx->flags |= GDB_FLAG_PROCESS_CONTINUING;
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}
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GDB_DECLARE_HANDLER(Continue)
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{
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char *addrStart = NULL;
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u32 addr = 0;
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if(ctx->selectedThreadIdForContinuing != 0 && ctx->selectedThreadIdForContinuing != ctx->currentThreadId)
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return 0;
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if(ctx->commandData[-1] == 'C')
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{
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if(ctx->commandData[0] == 0 || ctx->commandData[1] == 0 || (ctx->commandData[2] != 0 && ctx->commandData[2] == ';'))
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return GDB_ReplyErrno(ctx, EILSEQ);
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// Signal ignored...
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if(ctx->commandData[2] == ';')
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addrStart = ctx->commandData + 3;
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}
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else
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{
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if(ctx->commandData[0] != 0)
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addrStart = ctx->commandData;
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}
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if(addrStart != NULL && ctx->currentThreadId != 0)
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{
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ThreadContext regs;
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if(GDB_ParseHexIntegerList(&addr, ctx->commandData + 3, 1, 0) == NULL)
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return GDB_ReplyErrno(ctx, EILSEQ);
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Result r = svcGetDebugThreadContext(®s, ctx->debug, ctx->currentThreadId, THREADCONTEXT_CONTROL_CPU_SPRS);
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if(R_SUCCEEDED(r))
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{
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regs.cpu_registers.pc = addr;
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r = svcSetDebugThreadContext(ctx->debug, ctx->currentThreadId, ®s, THREADCONTEXT_CONTROL_CPU_SPRS);
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}
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}
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GDB_ContinueExecution(ctx);
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return 0;
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}
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GDB_DECLARE_VERBOSE_HANDLER(Continue)
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{
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char *pos = ctx->commandData;
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bool currentThreadFound = false;
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while(pos != NULL && *pos != 0 && !currentThreadFound)
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{
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if(*pos != 'c' && *pos != 'C')
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return GDB_ReplyErrno(ctx, EPERM);
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pos += *pos == 'C' ? 3 : 1;
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if(*pos++ != ':') // default action found
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{
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currentThreadFound = true;
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break;
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}
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char *nextpos = (char *)strchr(pos, ';');
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if(strncmp(pos, "-1", 2) == 0)
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currentThreadFound = true;
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else
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{
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u32 threadId;
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if(GDB_ParseHexIntegerList(&threadId, pos, 1, ';') == NULL)
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return GDB_ReplyErrno(ctx, EILSEQ);
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currentThreadFound = currentThreadFound || threadId == ctx->currentThreadId;
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}
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pos = nextpos;
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}
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if(ctx->currentThreadId == 0 || currentThreadFound)
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GDB_ContinueExecution(ctx);
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return 0;
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}
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GDB_DECLARE_HANDLER(GetStopReason)
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{
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return GDB_SendStopReply(ctx, &ctx->latestDebugEvent);
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}
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static int GDB_ParseCommonThreadInfo(char *out, GDBContext *ctx, int sig)
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{
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u32 threadId = ctx->currentThreadId;
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ThreadContext regs;
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s64 dummy;
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u32 core;
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Result r = svcGetDebugThreadContext(®s, ctx->debug, threadId, THREADCONTEXT_CONTROL_ALL);
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int n = sprintf(out, "T%02xthread:%x;", sig, threadId);
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if(R_FAILED(r))
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return n;
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r = svcGetDebugThreadParam(&dummy, &core, ctx->debug, ctx->currentThreadId, DBGTHREAD_PARAMETER_CPU_CREATOR); // Creator = "first ran, and running the thread"
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if(R_SUCCEEDED(r))
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n += sprintf(out + n, "core:%x;", core);
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if(ctx->isGDB)
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{
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for(u32 i = 0; i <= 12; i++)
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n += sprintf(out + n, "%x:%08x;", i, __builtin_bswap32(regs.cpu_registers.r[i]));
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}
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n += sprintf(out + n, "d:%08x;e:%08x;f:%08x;19:%08x;",
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__builtin_bswap32(regs.cpu_registers.sp), __builtin_bswap32(regs.cpu_registers.lr), __builtin_bswap32(regs.cpu_registers.pc),
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__builtin_bswap32(regs.cpu_registers.cpsr));
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if(ctx->isGDB)
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{
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for(u32 i = 0; i < 16; i++)
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{
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u64 val;
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memcpy(&val, ®s.fpu_registers.d[i], 8);
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n += sprintf(out + n, "%x:%016llx;", 26 + i, __builtin_bswap64(val));
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}
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n += sprintf(out + n, "2a:%08x;2b:%08x;", __builtin_bswap32(regs.fpu_registers.fpscr), __builtin_bswap32(regs.fpu_registers.fpexc));
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}
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return n;
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}
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void GDB_PreprocessDebugEvent(GDBContext *ctx, DebugEventInfo *info)
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{
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switch(info->type)
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{
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case DBGEVENT_ATTACH_THREAD:
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{
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if(ctx->nbThreads == MAX_DEBUG_THREAD)
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svcBreak(USERBREAK_ASSERT);
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else
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{
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ctx->threadInfos[ctx->nbThreads].id = info->thread_id;
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ctx->threadInfos[ctx->nbThreads++].tls = info->attach_thread.thread_local_storage;
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}
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break;
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}
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case DBGEVENT_EXIT_THREAD:
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{
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u32 i;
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for(i = 0; i < ctx->nbThreads && ctx->threadInfos[i].id != info->thread_id; i++);
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if(i == ctx->nbThreads || ctx->threadInfos[i].id != info->thread_id)
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svcBreak(USERBREAK_ASSERT);
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else
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{
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for(u32 j = i; j < ctx->nbThreads - 1; j++)
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memcpy(ctx->threadInfos + j, ctx->threadInfos + j + 1, sizeof(ThreadInfo));
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memset(ctx->threadInfos + --ctx->nbThreads, 0, sizeof(ThreadInfo));
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}
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break;
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}
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case DBGEVENT_EXIT_PROCESS:
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{
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ctx->processEnded = true;
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ctx->processExited = info->exit_process.reason == EXITPROCESS_EVENT_EXIT;
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break;
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}
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case DBGEVENT_OUTPUT_STRING:
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{
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if(info->output_string.string_addr >= 0xFFFFFFFE)
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{
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u32 sz = info->output_string.string_size, addr = info->output_string.string_addr, threadId = info->thread_id;
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memset(info, 0, sizeof(DebugEventInfo));
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info->type = (addr == 0xFFFFFFFF) ? DBGEVENT_SYSCALL_OUT : DBGEVENT_SYSCALL_IN;
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info->thread_id = threadId;
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info->flags = 1;
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info->syscall.syscall = sz;
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}
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break;
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}
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case DBGEVENT_EXCEPTION:
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{
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switch(info->exception.type)
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{
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case EXCEVENT_UNDEFINED_INSTRUCTION:
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{
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// kernel bugfix for thumb mode
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ThreadContext regs;
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Result r = svcGetDebugThreadContext(®s, ctx->debug, info->thread_id, THREADCONTEXT_CONTROL_CPU_SPRS);
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if(R_SUCCEEDED(r) && (regs.cpu_registers.cpsr & 0x20) != 0)
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{
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regs.cpu_registers.pc += 2;
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r = svcSetDebugThreadContext(ctx->debug, info->thread_id, ®s, THREADCONTEXT_CONTROL_CPU_SPRS);
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}
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break;
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}
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default:
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break;
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}
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}
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default:
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break;
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}
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}
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int GDB_SendStopReply(GDBContext *ctx, const DebugEventInfo *info)
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{
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char buffer[GDB_BUF_LEN + 1];
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switch(info->type)
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{
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case DBGEVENT_ATTACH_PROCESS:
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break; // Dismissed
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case DBGEVENT_ATTACH_THREAD:
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{
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if(info->attach_thread.creator_thread_id == 0 || !ctx->catchThreadEvents)
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break; // Dismissed
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else
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{
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ctx->currentThreadId = info->thread_id;
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return GDB_SendPacket(ctx, "T05create:;", 10);
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}
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}
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case DBGEVENT_EXIT_THREAD:
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{
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if(ctx->catchThreadEvents && info->exit_thread.reason < EXITTHREAD_EVENT_EXIT_PROCESS)
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{
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// no signal, SIGTERM, SIGQUIT (process exited), SIGTERM (process terminated)
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static int threadExitRepliesSigs[] = { 0, SIGTERM, SIGQUIT, SIGTERM };
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return GDB_SendFormattedPacket(ctx, "w%02x;%x", threadExitRepliesSigs[(u32)info->exit_thread.reason], info->thread_id);
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}
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break;
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}
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case DBGEVENT_EXIT_PROCESS:
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{
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// exited (no error / unhandled exception), SIGTERM (process terminated) * 2
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static const char *processExitReplies[] = { "W00", "X0f", "X0f" };
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return GDB_SendPacket(ctx, processExitReplies[(u32)info->exit_process.reason], 3);
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}
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case DBGEVENT_EXCEPTION:
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{
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ExceptionEvent exc = info->exception;
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switch(exc.type)
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{
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case EXCEVENT_UNDEFINED_INSTRUCTION:
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case EXCEVENT_PREFETCH_ABORT: // doesn't include hardware breakpoints
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case EXCEVENT_DATA_ABORT: // doesn't include hardware watchpoints
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case EXCEVENT_UNALIGNED_DATA_ACCESS:
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case EXCEVENT_UNDEFINED_SYSCALL:
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{
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u32 signum = exc.type == EXCEVENT_UNDEFINED_INSTRUCTION ? SIGILL :
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(exc.type == EXCEVENT_UNDEFINED_SYSCALL ? SIGSYS : SIGSEGV);
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ctx->currentThreadId = info->thread_id;
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GDB_ParseCommonThreadInfo(buffer, ctx, signum);
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return GDB_SendFormattedPacket(ctx, "%s", buffer);
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}
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case EXCEVENT_ATTACH_BREAK:
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return GDB_SendPacket(ctx, "S00", 3);
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case EXCEVENT_STOP_POINT:
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{
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ctx->currentThreadId = info->thread_id;
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switch(exc.stop_point.type)
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{
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case STOPPOINT_SVC_FF:
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{
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GDB_ParseCommonThreadInfo(buffer, ctx, SIGTRAP);
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return GDB_SendFormattedPacket(ctx, "%sswbreak:;", buffer);
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break;
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}
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case STOPPOINT_BREAKPOINT:
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{
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// /!\ Not actually implemented (and will never be)
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GDB_ParseCommonThreadInfo(buffer, ctx, SIGTRAP);
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return GDB_SendFormattedPacket(ctx, "%shwbreak:;", buffer);
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break;
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}
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case STOPPOINT_WATCHPOINT:
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{
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const char *kinds = "arwa";
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WatchpointKind kind = GDB_GetWatchpointKind(ctx, exc.stop_point.fault_information);
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|
|
if(kind == WATCHPOINT_DISABLED)
|
||
|
|
GDB_SendDebugString(ctx, "Warning: unknown watchpoint encountered!\n");
|
||
|
|
|
||
|
|
GDB_ParseCommonThreadInfo(buffer, ctx, SIGTRAP);
|
||
|
|
return GDB_SendFormattedPacket(ctx, "%s%cwatch:%08x;", buffer, kinds[(u32)kind], exc.stop_point.fault_information);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
case EXCEVENT_USER_BREAK:
|
||
|
|
{
|
||
|
|
ctx->currentThreadId = info->thread_id;
|
||
|
|
GDB_ParseCommonThreadInfo(buffer, ctx, SIGINT);
|
||
|
|
return GDB_SendFormattedPacket(ctx, "%s", buffer);
|
||
|
|
//TODO
|
||
|
|
}
|
||
|
|
|
||
|
|
case EXCEVENT_DEBUGGER_BREAK:
|
||
|
|
{
|
||
|
|
u32 threadIds[4];
|
||
|
|
u32 nbThreads = 0;
|
||
|
|
|
||
|
|
for(u32 i = 0; i < 4; i++)
|
||
|
|
{
|
||
|
|
if(exc.debugger_break.thread_ids[i] > 0)
|
||
|
|
threadIds[nbThreads++] = (u32)exc.debugger_break.thread_ids[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
u32 currentThreadId = nbThreads > 0 ? GDB_GetCurrentThreadFromList(ctx, threadIds, nbThreads) : GDB_GetCurrentThread(ctx);
|
||
|
|
s64 dummy;
|
||
|
|
u32 mask = 0;
|
||
|
|
|
||
|
|
svcGetDebugThreadParam(&dummy, &mask, ctx->debug, currentThreadId, DBGTHREAD_PARAMETER_SCHEDULING_MASK_LOW);
|
||
|
|
|
||
|
|
if(mask == 1)
|
||
|
|
{
|
||
|
|
ctx->currentThreadId = currentThreadId;
|
||
|
|
GDB_ParseCommonThreadInfo(buffer, ctx, SIGINT);
|
||
|
|
return GDB_SendFormattedPacket(ctx, "%s", buffer);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
return GDB_SendPacket(ctx, "S02", 3);
|
||
|
|
}
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
case DBGEVENT_SYSCALL_IN:
|
||
|
|
{
|
||
|
|
ctx->currentThreadId = info->thread_id;
|
||
|
|
GDB_ParseCommonThreadInfo(buffer, ctx, SIGTRAP);
|
||
|
|
return GDB_SendFormattedPacket(ctx, "%ssyscall_entry:%02x;", buffer, info->syscall.syscall);
|
||
|
|
}
|
||
|
|
|
||
|
|
case DBGEVENT_SYSCALL_OUT:
|
||
|
|
{
|
||
|
|
ctx->currentThreadId = info->thread_id;
|
||
|
|
GDB_ParseCommonThreadInfo(buffer, ctx, SIGTRAP);
|
||
|
|
return GDB_SendFormattedPacket(ctx, "%ssyscall_return:%02x;", buffer, info->syscall.syscall);
|
||
|
|
}
|
||
|
|
|
||
|
|
case DBGEVENT_OUTPUT_STRING:
|
||
|
|
{
|
||
|
|
u32 addr = info->output_string.string_addr;
|
||
|
|
u32 remaining = info->output_string.string_size;
|
||
|
|
u32 sent = 0;
|
||
|
|
int total = 0;
|
||
|
|
while(remaining > 0)
|
||
|
|
{
|
||
|
|
u32 pending = (GDB_BUF_LEN - 1) / 2;
|
||
|
|
pending = pending < remaining ? pending : remaining;
|
||
|
|
|
||
|
|
int res = GDB_SendMemory(ctx, "O", 1, addr + sent, pending);
|
||
|
|
if(res < 0 || (u32) res != 5 + 2 * pending)
|
||
|
|
break;
|
||
|
|
|
||
|
|
sent += pending;
|
||
|
|
remaining -= pending;
|
||
|
|
total += res;
|
||
|
|
}
|
||
|
|
|
||
|
|
return total;
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Only 1 blocking event can be enqueued at a time: they preempt all the other threads.
|
||
|
|
The only "non-blocking" event that is implemented is EXIT PROCESS (but it's a very special case)
|
||
|
|
*/
|
||
|
|
int GDB_HandleDebugEvents(GDBContext *ctx)
|
||
|
|
{
|
||
|
|
if(ctx->state == GDB_STATE_CLOSING)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
DebugEventInfo info;
|
||
|
|
Result rdbg = svcGetProcessDebugEvent(&info, ctx->debug);
|
||
|
|
|
||
|
|
if(R_FAILED(rdbg))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
GDB_PreprocessDebugEvent(ctx, &info);
|
||
|
|
|
||
|
|
int ret = 0;
|
||
|
|
bool continueAutomatically = info.type == DBGEVENT_OUTPUT_STRING || info.type == DBGEVENT_ATTACH_PROCESS ||
|
||
|
|
(info.type == DBGEVENT_ATTACH_THREAD && (info.attach_thread.creator_thread_id == 0 || !ctx->catchThreadEvents)) ||
|
||
|
|
(info.type == DBGEVENT_EXIT_THREAD && (info.exit_thread.reason >= EXITTHREAD_EVENT_EXIT_PROCESS || !ctx->catchThreadEvents)) ||
|
||
|
|
info.type == DBGEVENT_EXIT_PROCESS || !(info.flags & 1);
|
||
|
|
|
||
|
|
|
||
|
|
if(continueAutomatically)
|
||
|
|
{
|
||
|
|
Result r = 0;
|
||
|
|
ret = GDB_SendStopReply(ctx, &info);
|
||
|
|
if(info.flags & 1)
|
||
|
|
r = svcContinueDebugEvent(ctx->debug, ctx->continueFlags);
|
||
|
|
|
||
|
|
if(r == (Result)0xD8A02008) // process ended
|
||
|
|
return -2;
|
||
|
|
|
||
|
|
return -ret - 3;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if(ctx->processEnded)
|
||
|
|
return -2;
|
||
|
|
|
||
|
|
ctx->latestDebugEvent = info;
|
||
|
|
ret = GDB_SendStopReply(ctx, &info);
|
||
|
|
ctx->flags &= ~GDB_FLAG_PROCESS_CONTINUING;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|