mirror of
https://github.com/mmorearty/hardware-breakpoints
synced 2026-06-08 16:06:04 +00:00
rename the class
This commit is contained in:
Mike Morearty
committed by
Mike Morearty
Mike Morearty
parent
455966e532
commit
a88f2609c3
@@ -1,86 +1,86 @@
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// Copyright (c) 2000 Mike Morearty <mike@morearty.com>
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// Original source and docs: http://www.morearty.com/code/breakpoint
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#include <windows.h>
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#include <assert.h>
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#include "breakpoint.h"
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#ifdef _DEBUG
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void CBreakpoint::Set(void* address, int len, Condition when)
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{
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// make sure this breakpoint isn't already set
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assert(m_index == -1);
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CONTEXT cxt;
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HANDLE thisThread = GetCurrentThread();
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switch (len)
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{
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case 1: len = 0; break;
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case 2: len = 1; break;
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case 4: len = 3; break;
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default: assert(false); // invalid length
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}
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// The only registers we care about are the debug registers
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cxt.ContextFlags = CONTEXT_DEBUG_REGISTERS;
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// Read the register values
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if (!GetThreadContext(thisThread, &cxt))
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assert(false);
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// Find an available hardware register
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for (m_index = 0; m_index < 4; ++m_index)
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{
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if ((cxt.Dr7 & (1 << (m_index*2))) == 0)
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break;
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}
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assert(m_index < 4); // All hardware breakpoint registers are already being used
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switch (m_index)
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{
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case 0: cxt.Dr0 = (DWORD) address; break;
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case 1: cxt.Dr1 = (DWORD) address; break;
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case 2: cxt.Dr2 = (DWORD) address; break;
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case 3: cxt.Dr3 = (DWORD) address; break;
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default: assert(false); // m_index has bogus value
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}
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SetBits(cxt.Dr7, 16 + (m_index*4), 2, when);
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SetBits(cxt.Dr7, 18 + (m_index*4), 2, len);
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SetBits(cxt.Dr7, m_index*2, 1, 1);
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// Write out the new debug registers
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if (!SetThreadContext(thisThread, &cxt))
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assert(false);
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}
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void CBreakpoint::Clear()
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{
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if (m_index != -1)
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{
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CONTEXT cxt;
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HANDLE thisThread = GetCurrentThread();
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// The only registers we care about are the debug registers
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cxt.ContextFlags = CONTEXT_DEBUG_REGISTERS;
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// Read the register values
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if (!GetThreadContext(thisThread, &cxt))
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assert(false);
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// Zero out the debug register settings for this breakpoint
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assert(m_index >= 0 && m_index < 4); // m_index has bogus value
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SetBits(cxt.Dr7, m_index*2, 1, 0);
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// Write out the new debug registers
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if (!SetThreadContext(thisThread, &cxt))
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assert(false);
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m_index = -1;
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}
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}
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#endif // _DEBUG
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// Copyright (c) 2000 Mike Morearty <mike@morearty.com>
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// Original source and docs: http://www.morearty.com/code/breakpoint
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#include <windows.h>
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#include <assert.h>
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#include "hardwarebp.h"
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#ifdef _DEBUG
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void HardwareBreakpoint::Set(void* address, int len, Condition when)
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{
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// make sure this breakpoint isn't already set
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assert(m_index == -1);
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CONTEXT cxt;
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HANDLE thisThread = GetCurrentThread();
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switch (len)
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{
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case 1: len = 0; break;
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case 2: len = 1; break;
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case 4: len = 3; break;
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default: assert(false); // invalid length
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}
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// The only registers we care about are the debug registers
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cxt.ContextFlags = CONTEXT_DEBUG_REGISTERS;
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// Read the register values
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if (!GetThreadContext(thisThread, &cxt))
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assert(false);
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// Find an available hardware register
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for (m_index = 0; m_index < 4; ++m_index)
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{
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if ((cxt.Dr7 & (1 << (m_index*2))) == 0)
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break;
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}
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assert(m_index < 4); // All hardware breakpoint registers are already being used
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switch (m_index)
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{
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case 0: cxt.Dr0 = (DWORD) address; break;
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case 1: cxt.Dr1 = (DWORD) address; break;
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case 2: cxt.Dr2 = (DWORD) address; break;
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case 3: cxt.Dr3 = (DWORD) address; break;
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default: assert(false); // m_index has bogus value
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}
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SetBits(cxt.Dr7, 16 + (m_index*4), 2, when);
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SetBits(cxt.Dr7, 18 + (m_index*4), 2, len);
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SetBits(cxt.Dr7, m_index*2, 1, 1);
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// Write out the new debug registers
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if (!SetThreadContext(thisThread, &cxt))
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assert(false);
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}
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void HardwareBreakpoint::Clear()
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{
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if (m_index != -1)
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{
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CONTEXT cxt;
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HANDLE thisThread = GetCurrentThread();
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// The only registers we care about are the debug registers
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cxt.ContextFlags = CONTEXT_DEBUG_REGISTERS;
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// Read the register values
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if (!GetThreadContext(thisThread, &cxt))
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assert(false);
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// Zero out the debug register settings for this breakpoint
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assert(m_index >= 0 && m_index < 4); // m_index has bogus value
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SetBits(cxt.Dr7, m_index*2, 1, 0);
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// Write out the new debug registers
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if (!SetThreadContext(thisThread, &cxt))
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assert(false);
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m_index = -1;
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}
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}
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#endif // _DEBUG
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+36
-36
@@ -1,36 +1,36 @@
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// Copyright (c) 2000 Mike Morearty <mike@morearty.com>
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// Original source and docs: http://www.morearty.com/code/breakpoint
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#ifndef _BREAKPOINT_H_
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#define _BREAKPOINT_H_
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#ifdef _DEBUG
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class CBreakpoint
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{
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public:
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CBreakpoint() { m_index = -1; }
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~CBreakpoint() { Clear(); }
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// The enum values correspond to the values used by the Intel Pentium,
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// so don't change them!
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enum Condition { Write = 1, Read /* or write! */ = 3 };
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void Set(void* address, int len /* 1, 2, or 4 */, Condition when);
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void Clear();
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protected:
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inline void SetBits(unsigned long& dw, int lowBit, int bits, int newValue)
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{
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int mask = (1 << bits) - 1; // e.g. 1 becomes 0001, 2 becomes 0011, 3 becomes 0111
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dw = (dw & ~(mask << lowBit)) | (newValue << lowBit);
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}
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int m_index; // -1 means not set; 0-3 means we've set that hardware bp
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};
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#endif // _DEBUG
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#endif // _BREAKPOINT_H_
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// Copyright (c) 2000 Mike Morearty <mike@morearty.com>
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// Original source and docs: http://www.morearty.com/code/breakpoint
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#ifndef _HARDWAREBP_H_
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#define _HARDWAREBP_H_
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#ifdef _DEBUG
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class HardwareBreakpoint
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{
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public:
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HardwareBreakpoint() { m_index = -1; }
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~HardwareBreakpoint() { Clear(); }
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// The enum values correspond to the values used by the Intel Pentium,
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// so don't change them!
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enum Condition { Write = 1, Read /* or write! */ = 3 };
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void Set(void* address, int len /* 1, 2, or 4 */, Condition when);
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void Clear();
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protected:
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inline void SetBits(unsigned long& dw, int lowBit, int bits, int newValue)
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{
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int mask = (1 << bits) - 1; // e.g. 1 becomes 0001, 2 becomes 0011, 3 becomes 0111
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dw = (dw & ~(mask << lowBit)) | (newValue << lowBit);
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}
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int m_index; // -1 means not set; 0-3 means we've set that hardware bp
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};
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#endif // _DEBUG
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#endif // _HARDWAREBP_H_
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