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tthomps
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Add functions to print strings via serial port.
Add simple debugging program that can parse a map file and print functions via a stack trace. Add debug stack trace to page fault handler. In build settings, redirect Qemu's COM1 to a named pipe the debugger uses. Note: Qemu will appear locked if the debugger isn't running. Make sure all MyOS programs are generating map files and not omitting frame pointers.
1 parent 1a07d4d commit 586bd9e

27 files changed

+3984
-10
lines changed

‎Media/Screenshots/Debugger.png

111 KB
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‎My-Doom

‎MyOS_1.sln

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Original file line numberDiff line numberDiff line change
@@ -21,86 +21,120 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "TestApp2", "TestApp2\TestAp
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EndProject
2222
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "TestApp2ForWindows", "TestApp2ForWindows\TestApp2ForWindows.vcxproj", "{6BA12269-A558-4634-B51D-B61FD8143410}"
2323
EndProject
24+
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SimpleDebugger", "SupportApps\SimpleDebugger\SimpleDebugger.csproj", "{5DF601CC-B794-43C6-8138-3B9ED99F2843}"
25+
EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Debug|x64 = Debug|x64
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Debug|x86 = Debug|x86
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Release|Any CPU = Release|Any CPU
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Release|x64 = Release|x64
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Release|x86 = Release|x86
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
36+
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3439
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41+
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46+
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4047
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{5D4E87A7-5402-4E84-B89D-6A7B42936E4D}.Release|x86.Build.0 = Release|Win32
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{E20F026A-1CE2-4B40-BEA7-39E9644F3A0C}.Debug|x64.Build.0 = Debug|x64
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{E20F026A-1CE2-4B40-BEA7-39E9644F3A0C}.Debug|x86.ActiveCfg = Debug|Win32
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86+
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91+
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96+
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130+
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131+
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132+
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135+
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136+
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE

‎MyOS_1/Build_Number.h

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@@ -3,4 +3,4 @@
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// Define a build number. This number will be incremented by a simple console program called by a post-build event
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// It's put here in its own file to keep the other program from messing up the source
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#define \
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BUILD_NUMBER 6354
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BUILD_NUMBER 6401

‎MyOS_1/Console_Serial.c

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#include "Console_Serial.h"
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#include "System_Specific.h"
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#include "printf.h"
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#ifndef USE_SERIAL
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void init_serial() {}
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/*int serial_received() {}
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char read_serial() {}
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int is_transmit_empty() {}*/
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int serial_received() { return false; }
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char read_serial() { return '\0'; }
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int is_transmit_empty() { return true; }
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int sprintf(char *messageFormat, ...) { return 0; }
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void write_serial(char a) {}
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void write_serial_string(const char *str) {}
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#endif
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#ifdef USE_SERIAL
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return inb(PORT + 5) & 0x20;
3538
}
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int serial_printf(char *messageFormat, ...)
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{
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char buffer[128] = { 0 };
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va_list va;
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va_start(va, messageFormat);
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const int ret = vsnprintf(buffer, 128, messageFormat, va);
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write_serial_string(buffer);
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va_end(va);
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return ret;
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}
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void write_serial(char a) {
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while (is_transmit_empty() == 0);
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outb(PORT, a);
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}
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void write_serial_string(const char *str)
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{
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int len = strlen(str);
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for (int i = 0; i < len; ++i)
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write_serial(str[i]);
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}
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#endif

‎MyOS_1/Console_Serial.h

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@@ -13,4 +13,8 @@ char read_serial();
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int serial_received();
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int serial_printf(char *messageFormat, ...);
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void write_serial(char a);
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void write_serial_string(const char *str);

‎MyOS_1/Console_Shell.c

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@@ -31,6 +31,7 @@
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#include "Drivers\Keyboard.h"
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#include "../MyOS_GUI_Shell/GUI_Kernel_Shell.h"
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#include "Drivers/IDE.h"
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#include "Debugging/Debug.h"
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int inputPosition = 0;
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#define COMMAND_HISTORY_SIZE 10
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return;
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}
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// Test stack trace
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if (strcmp(currentCommand, "bt") == 0)
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{
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DebugStackTrace(6);
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return;
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}
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// Test memory allocation
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if (strcmp(currentCommand, "mem") == 0)
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{

‎MyOS_1/Debugging/Debug.c

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,20 @@
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#include "Debug.h"
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#include "../printf.h"
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#include "../Tasks/Context.h"
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#include "../Console_Serial.h"
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// This is meant to be used with the debugger support app, custom for MyOS
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void DebugStackTrace(unsigned int MaxFrames)
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{
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STACK_FRAME *pStackFrame;
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__asm mov pStackFrame, ebp
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serial_printf("Stack trace:\n%s\n", tasks[currentTask].imageName);
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for (unsigned int frame = 0; pStackFrame && frame < MaxFrames; ++frame)
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{
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// Unwind to previous stack frame
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serial_printf("0x%X\n", pStackFrame->eip);
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pStackFrame = pStackFrame->ebp;
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}
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}

‎MyOS_1/Debugging/Debug.h

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,11 @@
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#pragma once
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#include <stdint.h>
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typedef struct STACK_FRAME
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{
7+
struct STACK_FRAME* ebp;
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uint32_t eip;
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}STACK_FRAME;
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void DebugStackTrace(unsigned int MaxFrames);

‎MyOS_1/Interrupts/Interrupts.c

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Original file line numberDiff line numberDiff line change
@@ -15,6 +15,7 @@
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#include "../Tasks/Context.h"
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#include "../Drivers/PS2_Mouse.h"
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#include "../GUI_Kernel.h"
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#include "../Debugging/Debug.h"
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unsigned long interrupts_fired;
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@@ -609,6 +610,8 @@ void _declspec(naked) page_fault_handler(void)
609610

610611
kprintf("Memory address accessed: 0x%lX\n", __readcr2());
611612

613+
DebugStackTrace(10);
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terminal_writestring("System halted.\n");
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for (;;)

‎MyOS_1/MyOS_1.vcxproj

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<RandomizedBaseAddress>true</RandomizedBaseAddress>
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<FixedBaseAddress>false</FixedBaseAddress>
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<NoEntryPoint>true</NoEntryPoint>
220+
<MapExports>true</MapExports>
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</Link>
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<PostBuildEvent>
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<Command>"C:\Program Files\qemu\qemu-system-x86_64w.exe" -soundhw sb16,adlib -monitor stdio -netdev user,id=u1,tftp="C:\Users\Administrator\.VirtualBox\TFTP" -device virtio-net,netdev=u1 -kernel "$(TargetPath)" -object filter-dump,id=f1,netdev=u1,file="C:\Program Files\qemu\dump.dat" -accel hax &amp;&amp; "C:\Users\Administrator\Documents\Visual Studio 2015\Projects\AutoIncrementBuild\Release\AutoIncrementBuild.exe"</Command>
223+
<Command>"C:\Program Files\qemu\qemu-system-x86_64w.exe" -serial pipe:MyOS_PIPE -soundhw sb16,adlib -monitor stdio -netdev user,id=u1,tftp="C:\Users\Administrator\.VirtualBox\TFTP" -device virtio-net,netdev=u1 -kernel "$(TargetPath)" -object filter-dump,id=f1,netdev=u1,file="C:\Program Files\qemu\dump.dat" -accel hax &amp;&amp; "C:\Users\Administrator\Documents\Visual Studio 2015\Projects\AutoIncrementBuild\Release\AutoIncrementBuild.exe"</Command>
223224
</PostBuildEvent>
224225
<PostBuildEvent>
225226
<Message>Launching QEMU</Message>
@@ -277,6 +278,7 @@
277278
<CallingConvention Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">Cdecl</CallingConvention>
278279
<CallingConvention Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">Cdecl</CallingConvention>
279280
</ClCompile>
281+
<ClCompile Include="Debugging\Debug.c" />
280282
<ClCompile Include="Drivers\AdLib.c" />
281283
<ClCompile Include="Drivers\Bochs_VGA.c" />
282284
<ClCompile Include="Drivers\e1000.c" />
@@ -330,6 +332,7 @@
330332
<ClInclude Include="Console_Serial.h" />
331333
<ClInclude Include="Console_Shell.h" />
332334
<ClInclude Include="Console_VGA.h" />
335+
<ClInclude Include="Debugging\Debug.h" />
333336
<ClInclude Include="Drivers\AdLib.h" />
334337
<ClInclude Include="Drivers\Bochs_VGA.h" />
335338
<ClInclude Include="Drivers\e1000.h" />

‎MyOS_1/MyOS_1.vcxproj.filters

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -70,6 +70,12 @@
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<Filter Include="Source Files\GUI">
7171
<UniqueIdentifier>{ed1bb142-e86a-48ef-85ae-82740aea315c}</UniqueIdentifier>
7272
</Filter>
73+
<Filter Include="Header Files\Debugging">
74+
<UniqueIdentifier>{3b619734-27a0-45df-8fc4-302973758206}</UniqueIdentifier>
75+
</Filter>
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<Filter Include="Source Files\Debugging">
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<UniqueIdentifier>{3ff4899d-7636-427e-b059-139fe21daa2e}</UniqueIdentifier>
78+
</Filter>
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</ItemGroup>
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<ItemGroup>
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<ClCompile Include="paging.c">
@@ -213,6 +219,9 @@
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<ClCompile Include="Drivers\IDE.c">
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<Filter>Source Files\Drivers</Filter>
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</ClCompile>
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<ClCompile Include="Debugging\Debug.c">
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<Filter>Source Files\Debugging</Filter>
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</ClCompile>
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</ItemGroup>
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<ItemGroup>
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<ClInclude Include="misc.h">
@@ -362,6 +371,9 @@
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<ClInclude Include="Drivers\IDE.h">
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<Filter>Header Files\Drivers</Filter>
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</ClInclude>
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<ClInclude Include="Debugging\Debug.h">
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<Filter>Header Files\Debugging</Filter>
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</ClInclude>
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</ItemGroup>
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<ItemGroup>
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<Text Include="Referenced_Reading.txt">

‎MyOS_1/main.c

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Original file line numberDiff line numberDiff line change
@@ -137,6 +137,7 @@ void KeStartupPhase2(multiboot_info *multibootInfo)
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// Say Hello
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terminal_writestring("Hello world!\n");
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write_serial_string("\nHello world!\n");
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kprintf("Welcome to My OS (working title) build %d\n", BUILD_NUMBER);
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if (debugLevel)

‎MyOS_1/myos_io.h

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Original file line numberDiff line numberDiff line change
@@ -27,6 +27,7 @@ typedef struct OPEN_FILES
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bool readOnly[MAX_FILES];
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bool isOpen[MAX_FILES];
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uint8_t *buffer[MAX_FILES];
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uint32_t taskIndex[MAX_FILES];
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} OPEN_FILES;
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