Hi Jean, I don't think that it is related to the warning that you have suggested
On Tue, Sep 24, 2013 at 11:58 AM, Jean Pihet <jean.pi...@linaro.org> wrote: > Hi, > > Adding Russell and l.a.k ML. > > Another question: is this linked to the following build warning? > CC arch/arm/kernel/return_address.o > arch/arm/kernel/return_address.c:63:2: warning: #warning "TODO: > return_address should use unwind tables" > > Regards, > Jean > > On 24 September 2013 07:23, Anurag Aggarwal <anurag19aggar...@gmail.com> > wrote: >> Hi All, >> >> While executing unwind backtrace instructions in ARM, in the function >> unwind_exec_insn() >> there are chances that SP overflows from stack. >> >> >> For example while executing instruction with opcode 0xAE, vsp can go >> beyond stack to area that has not been allocated till now. >> >> unsigned long *vsp = (unsigned long *)ctrl->vrs[SP]; >> int reg; >> >> /* pop R4-R[4+bbb] */ >> for (reg = 4; reg <= 4 + (insn & 7); reg++) >> ctrl->vrs[reg] = *vsp++; >> >> The above scenario can happen while executing any of the unwind instruction. >> >> One of the ways to fix the problem is to check for vsp with stack >> limits before we increment it, but doing it for all the instructions >> seems a little bad. >> >> I just want to know that if anyone has faced the problem before >> >> I am working on Linux kernel for Android phones and I saw one case >> when this happened. >> >> I am new to Linux Kernel so not sure if this is the right place to ask >> the question. >> >> >> -- >> Anurag Aggarwal >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >> the body of a message to majord...@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ -- Anurag Aggarwal -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
