70 lines
2.3 KiB
Plaintext
70 lines
2.3 KiB
Plaintext
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Debugging Metalkit Apps
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-----------------------
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Using VMware's gdb stub, you can get source-level debugging for your
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Metalkit apps.
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Add these three config options to your .vmx file:
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debugStub.listen.guest32 = "TRUE"
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debugStub.hideBreakpoints = "TRUE"
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monitor.debugOnStartGuest32 = "TRUE"
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Now run your VM. It should hang just after power on, before showing
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the BIOS. If you can see your VM's stdout, you should see a message
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about attaching gdb. Now we can attach gdb. You'll need the .elf file
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which matches the .img you're running in the VM. Metalkit's default
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makefiles compile ELF versions of your binary with full debug symbols.
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micah@micah-64:~/metalkit/examples/apm-test$ gdb -q apm-test.elf
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No symbol table is loaded. Use the "file" command.
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Using host libthread_db library "/lib/libthread_db.so.1".
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(gdb) set arch i386
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The target architecture is assumed to be i386
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(gdb) target remote localhost:8832
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Remote debugging using localhost:8832
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[New Thread 1]
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0x000ffff0 in ?? ()
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(gdb) break main
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Breakpoint 1 at 0x100ba2: file main.c, line 11.
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(gdb) cont
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Continuing.
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Now you should see the VM boot. If you need to stop earlier, to debug
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the bootloader, you can set a breakpoint at *0x7c00 instead. Usually
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starting at main() is quite sufficient. As soon as Metalkit loads, you
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should hit this breakpoint. From here on, all the normal gdb debug-fu
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should work.
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Breakpoint 1, main () at main.c:11
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11 {
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(gdb) list
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6 #include "keyboard.h"
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7 #include "apm.h"
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8
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9 int
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10 main(void)
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11 {
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12 ConsoleVGA_Init();
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13 Intr_Init();
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14 Intr_SetFaultHandlers(Console_UnhandledFault);
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15 Keyboard_Init();
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(gdb) next
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main () at main.c:12
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12 ConsoleVGA_Init();
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(gdb)
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13 Intr_Init();
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(gdb)
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14 Intr_SetFaultHandlers(Console_UnhandledFault);
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(gdb)
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15 Keyboard_Init();
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(gdb) p gConsole
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$1 = {beginPanic = 0x1005ef <ConsoleVGABeginPanic>,
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clear = 0x1004d2 <ConsoleVGAClear>,
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moveTo = 0x1004c1 <ConsoleVGAMoveTo>,
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writeChar = 0x100511 <ConsoleVGAWriteChar>,
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flush = 0x100482 <ConsoleVGAMoveHardwareCursor>}
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(gdb)
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---
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