[SeaBIOS] [PATCH RFC 1/7] Only use -fomit-frame-pointer with 32bit flat code

Julian Pidancet julian.pidancet at gmail.com
Sat Dec 17 16:50:40 CET 2011

On Sat, Dec 17, 2011 at 3:38 PM, Kevin O'Connor <kevin at koconnor.net> wrote:
> On Fri, Dec 16, 2011 at 02:15:07PM +0000, Julian Pidancet wrote:
>> The real-mode emulator that Windows 7 uses to execute the vga bios rom
>> becomes very confused when the code tries to dereference the stack
>> pointer instead of using the frame pointer, leading to corruption of
>> parameters passed on the stack from one function to another.
>> Signed-off-by: Julian Pidancet <julian.pidancet at gmail.com>
> Wow - I can only imagine how hard it was to find that.
> I'm okay with turning off omit-frame-pointer for the vga bios.
> However, I'd prefer not to turn it off for the main seabios build.
> Does the emulator also try to emulate parts of the BIOS, which would
> make that a problem?

Besides the functions which are common to both the BIOS and the VGA
ROM ( src/output.c and src/util.c), it doesn't seem to make any
particular problem with the rest of the BIOS.


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