On Fri, 15 May 2009, Jason Wessel wrote:
>
> The treatment of the SP register is different on x86_64 and i386.
> This is a regression fix that lived outside the mainline kernel from
> 2.6.27 to now. The regression was a result of the original merge
> consolidation of the i386 and x86_64 archs to x86.
>
> The incorrectly reported SP on i386 prevented stack tracebacks from
> working correctly in gdb.
Is this only ever used for kernel register state?
Because in the _general_ case, the code should likely be something like
if (user_mode_vm(regs)) {
gdb_regs[GDB_SS] = regs->ss;
gdb_regs[GDB_SP] = regs->sp;
} else {
gdb_regs[GDB_SS] = __KERNEL_DS;
gdb_regs[GDB_SP] = (unsigned long)®s->sp
}
if the 'regs' contents can ever point to user mode state.
Linus
------------------------------------------------------------------------------
Crystal Reports - New Free Runtime and 30 Day Trial
Check out the new simplified licensing option that enables
unlimited royalty-free distribution of the report engine
for externally facing server and web deployment.
http://p.sf.net/sfu/businessobjects
_______________________________________________
Kgdb-bugreport mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
