Messages in this thread | | | Date | Thu, 29 Nov 2007 18:00:43 -0500 | From | Chuck Ebbert <> | Subject | Re: [PATCH x86/mm 6/6] x86-64 ia32 ptrace get/putreg32 current task |
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On 11/29/2007 05:21 PM, Roland McGrath wrote: >>> case offsetof(struct user32, regs.gs): >>> *val = child->thread.gsindex; >>> + if (child == current) >>> + asm("movl %%gs,%0" : "=r" (*val)); >> Won't this return the kernel's GS instead of the user's? > [...] >> But this is x86_64, where swapgs is done on kernel entry. > > As I understand it, and from what the documentation I have says, swapgs has > nothing to do with the %gs selector. It affects the "GS base register", > i.e. the MSR. >
Yep, I confused the GS selector with the base address in the descriptor. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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