Messages in this thread | | | From | Roland McGrath <> | Subject | Re: [PATCH x86/mm 6/6] x86-64 ia32 ptrace get/putreg32 current task | Date | Thu, 29 Nov 2007 14:21:57 -0800 (PST) |
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> > 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.
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