linux-toradex.git/arch/tile/kernel/kgdb.c, branch v4.5

tile: define a macro ktext_writable_addr to get writable kernel text address

2016-01-04T20:09:31+00:00

It is used by kgdb, ftrace, kprobe and jump label, so we factor
this out into a helper routine.

Reviewed-by: Chris Metcalf 
Signed-off-by: Zhigang Lu 
Signed-off-by: Chris Metcalf

arch: tile: kernel: kgdb.c: Use memcpy() instead of pointer copy one by one

2014-11-12T19:27:10+00:00

Not only memcpy() is faster than pointer copy, but also let code more
clearer and simple, which can avoid compiling warning (the original
implementation copy registers by exceeding member array border).

The related warning (with allmodconfig under tile):

    CC      arch/tile/kernel/kgdb.o
  arch/tile/kernel/kgdb.c: In function 'sleeping_thread_to_gdb_regs':
  arch/tile/kernel/kgdb.c:140:31: warning: iteration 53u invokes undefined behavior [-Waggressive-loop-optimizations]
     *(ptr++) = thread_regs->regs[reg];
                                 ^
  arch/tile/kernel/kgdb.c:139:2: note: containing loop
    for (reg = 0; reg <= TREG_LAST_GPR; reg++)
    ^

Signed-off-by: Chen Gang 
Signed-off-by: Chris Metcalf

tilegx: support KGDB

2013-09-03T18:51:26+00:00

Enter kernel debugger at boot with:
  --hvd UART_1=1 --hvx kgdbwait --hvx kgdboc=ttyS1,115200
or at runtime with:
  echo ttyS1,115200 > /sys/module/kgdboc/parameters/kgdboc
  echo g > /proc/sysrq-trigger

Signed-off-by: Chris Metcalf