On 05/04/2024 10.35, Nicholas Piggin wrote:
The backtrace handler terminates when it sees a NULL caller address, but the powerpc stack setup does not keep such a NULL caller frame at the start of the stack. This happens to work on pseries because the memory at 0 is mapped and it contains 0 at the location of the return address pointer if it were a stack frame. But this is fragile, and does not work with powernv where address 0 contains firmware instructions. Use the existing dummy frame on stack as the NULL caller, and create a new frame on stack for the entry code. Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx> --- powerpc/cstart64.S | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
