117 lines
3.1 KiB
C
117 lines
3.1 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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* SPDX-License-Identifier: (MIT OR GPL-2.0-or-later)
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*/
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#include "gdb/breakpoints.h"
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#define _REENT_ONLY
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#include <errno.h>
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u32 GDB_FindClosestBreakpointSlot(GDBContext *ctx, u32 address)
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{
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if(ctx->nbBreakpoints == 0 || address <= ctx->breakpoints[0].address)
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return 0;
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else if(address > ctx->breakpoints[ctx->nbBreakpoints - 1].address)
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return ctx->nbBreakpoints;
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u32 a = 0, b = ctx->nbBreakpoints - 1, m;
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do
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{
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m = (a + b) / 2;
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if(ctx->breakpoints[m].address < address)
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a = m;
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else if(ctx->breakpoints[m].address > address)
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b = m;
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else
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return m;
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}
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while(b - a > 1);
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return b;
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}
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int GDB_GetBreakpointInstruction(u32 *instruction, GDBContext *ctx, u32 address)
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{
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u32 id = GDB_FindClosestBreakpointSlot(ctx, address);
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if(id == ctx->nbBreakpoints || ctx->breakpoints[id].address != address)
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return -EINVAL;
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if(instruction != NULL)
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*instruction = ctx->breakpoints[id].savedInstruction;
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return 0;
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}
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int GDB_AddBreakpoint(GDBContext *ctx, u32 address, bool thumb, bool persist)
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{
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if(!thumb && (address & 3) != 0)
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return -EINVAL;
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address &= ~1;
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u32 id = GDB_FindClosestBreakpointSlot(ctx, address);
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if(id != ctx->nbBreakpoints && ctx->breakpoints[id].instructionSize != 0 && ctx->breakpoints[id].address == address)
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return 0;
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else if(ctx->nbBreakpoints == MAX_BREAKPOINT)
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return -EBUSY;
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for(u32 i = ctx->nbBreakpoints; i > id && i != 0; i--)
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ctx->breakpoints[i] = ctx->breakpoints[i - 1];
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ctx->nbBreakpoints++;
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Breakpoint *bkpt = &ctx->breakpoints[id];
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u32 instr = thumb ? BREAKPOINT_INSTRUCTION_THUMB : BREAKPOINT_INSTRUCTION_ARM;
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if(R_FAILED(svcReadProcessMemory(&bkpt->savedInstruction, ctx->debug, address, thumb ? 2 : 4)) ||
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R_FAILED(svcWriteProcessMemory(ctx->debug, &instr, address, thumb ? 2 : 4)))
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{
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for(u32 i = id; i < ctx->nbBreakpoints - 1; i++)
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ctx->breakpoints[i] = ctx->breakpoints[i + 1];
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memset(&ctx->breakpoints[--ctx->nbBreakpoints], 0, sizeof(Breakpoint));
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return -EFAULT;
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}
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bkpt->instructionSize = thumb ? 2 : 4;
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bkpt->address = address;
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bkpt->persistent = persist;
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return 0;
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}
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int GDB_DisableBreakpointById(GDBContext *ctx, u32 id)
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{
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Breakpoint *bkpt = &ctx->breakpoints[id];
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if(R_FAILED(svcWriteProcessMemory(ctx->debug, &bkpt->savedInstruction, bkpt->address, bkpt->instructionSize)))
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return -EFAULT;
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else return 0;
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}
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int GDB_RemoveBreakpoint(GDBContext *ctx, u32 address)
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{
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address &= ~1;
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u32 id = GDB_FindClosestBreakpointSlot(ctx, address);
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if(id == ctx->nbBreakpoints || ctx->breakpoints[id].address != address)
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return -EINVAL;
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int r = GDB_DisableBreakpointById(ctx, id);
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if(r != 0)
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return r;
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else
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{
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for(u32 i = id; i < ctx->nbBreakpoints - 1; i++)
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ctx->breakpoints[i] = ctx->breakpoints[i + 1];
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memset(&ctx->breakpoints[--ctx->nbBreakpoints], 0, sizeof(Breakpoint));
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return 0;
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}
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}
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