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 <npig...@gmail.com>
---
powerpc/cstart64.S | 15 +++++++++++++++
1 file changed, 15 insertions(+)
Reviewed-by: Thomas Huth <th...@redhat.com>
