Am Sonntag, den 09.02.2014, 02:05 -0800 schrieb Andi Kleen: > > EBX is a reserved as the base register when compiling with -fPIC. > > Otherwise it get a "error: can't find a register in class 'BREG' while > > reloading 'asm'". > > In this case you have to dwarf annotate the push/pop >
Okay, but i have no idea why and how to supply dwarf2 unwind annotations. Can you give my some hints? > > > > > Also I if this calls syscall.S:__kernel_vsyscall it clobbers more > > > registers > > > (ecx at least?) and you need to describe that to gcc with a + > > > > Sine ECX is in use as the second parameter it is still marked as > > clobbered. > > No input parameters are not clobbered. > I will fix this. > > I think it should word... As i know a system call will preserve all > > register expect the EAX, which is marked as in and out for this asm() > > directive. > > Yes the syscall does, but the vsyscall stub does not (for the !0x80 case) > > > This is due the -m32 compilation, i will get a log of > > "warning: integer constant is too large for 'unsigned long' type", > > because a unsigned long is only 32 bit. > > Don't explain it to me, put it into a comment. > I will place some comments in the source. - Stefani -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
