HI Andrew,
How can I adjust the debugger to correct mode? Or I have to enable the
debug after swtich to protected mode?
At 2017-08-04 10:57:16, "Andrew Fish" <[email protected]> wrote:
>The reset vector is 16-bit real mode, so you have the debugger in the wrong
>mode. The code should transition to 32 bit protected early in the flow.
>
>Sent from my iPhone
>
>> On Aug 3, 2017, at 7:47 PM, wang xiaofeng <[email protected]> wrote:
>>
>> Hello,
>> I am tring to add my own SEC code base on OVMF and run on QEMU. Since
>> the code cannot run I need to step to step trace the assembly code .
>> The hang point is very early before I can use either UDK or debug
>> serial output. I tried to use gdb to connect to QEMU.I start gdb in another
>> terminal, and issue the following commands:
>> (gdb) set architecture i386:x86-64:intel
>> (gdb) target remote localhost:1234
>> It really stops at the bios first instruction at 0XFFFFFFF0. But gdb shows
>> eip= 0xFFF0 and CS=0xF000(why it not be 0xfff0). After I trigger the command
>> "display /i $pc"
>> It shows the assembly code in 0xFFF0 instead of 0XFFFFFFF0, so the
>> information is incorrect.
>> Anyone knows how to corrently debug the SEC code ? Other debug tool is
>> also ok.
>> Thanks in advance!
>>
>>
>>
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