Hi, > > How is x86emu broken? I'm assuming it ignores the prefix for call, > > so > > it'll push a 16bit return address instead of a 32bit return address > > to > > the stack? > > I think so. Might be safer to save/restore %esp though. This > sequence might be simpler: > > pushl %eax > movl %esp, %eax > pushl $1f > retl > 1: cmpl %esp, %eax > jne broken_x86emu > popl %eax > > ... > > broken_x86emu: > movl %eax, %esp > popl %eax > iretw
Ah, fixup the stack without assuming specific behavior. Neat trick. > Note, though, in addition to checking for broken x86emu, the > assembler > entry code would also have to check that the last mode was not set > via > a vesa call (to avoid the "skifree" bug). Ok, Is there some easy way to access the BDA from assembler code (specifically the video_mode field)? Guess I must set a segment register for that. Maybe it's easier to just place an additional flag in the fseg which we can easily reach via cs override ... cheers, Gerd _______________________________________________ SeaBIOS mailing list SeaBIOS@seabios.org https://mail.coreboot.org/mailman/listinfo/seabios
