Isaku Yamahata (on Tue, 26 Feb 2008 22:58:55 +0900) wrote:
> /*
> * ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't
>@@ -153,7 +165,8 @@ END(__ia64_switch_to)
> * ar.csd: cleared
> * ar.ssd: cleared
> */
>-GLOBAL_ENTRY(__ia64_leave_syscall)
>+GLOBAL_ENTRY(__paravirt_leave_syscall)
>+ BR_IF_NATIVE(__ia64_leave_syscall, r22, p7)
> PT_REGS_UNWIND_INFO(0)
Move BR_IF_NATIVE after PT_REGS_UNWIND_INFO. PT_REGS_UNWIND_INFO must
define the unwind state at slot 0 of this function to get correct
unwind state. When virtualized, BR_IF_NATIVE will generate extra code
and move the unwind data past slot 0, breaking the backtrace.
>-GLOBAL_ENTRY(__ia64_leave_kernel)
>+GLOBAL_ENTRY(__paravirt_leave_kernel)
>+ BR_IF_NATIVE(__ia64_leave_kernel, r22, p7)
> PT_REGS_UNWIND_INFO(0)
Ditto.
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