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 14:25:31 -0800 (PST) |
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> But the ones that do the same thing for fs/es/ds are *not*. Those three > registers are kernel mode registers (ds/es are the regular kernel data > segment, fs is the per-cpu data segment), and restored on return to user > space from the stack.
Um, really? This is x86-64 code. AIUI those values don't have any effect at all in 64-bit mode (as the kernel is). I haven't found any code in entry_64.S or ia32entry.S that touches them. __switch_to uses direct access to the segment registers just as I've done.
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