lib: sbi: dbtr: Fix shared memory layout

The existing sbi_dbtr_shmem_entry has a size of 5 * XLEN with the final
entry being idx. This is in contrast to the SBI v3.0-rc7 Chapter 19.
Debug Triggers Extension [0] where idx and trig_state share the same
offset (0) in shared memory, with a total size of 4 * XLEN for all the
SBI calls.

Replace struct with union to match memory layout described in SBI.

[0] https://github.com/riscv-non-isa/riscv-sbi-doc/tree/v3.0-rc7/src/ext-debug-triggers.adoc

Fixes: 97f234f15c96 ("lib: sbi: Introduce the SBI debug triggers extension support")
Signed-off-by: Jesse Taube <[email protected]>
Reviewed-by: Charlie Jenkins <[email protected]>
Tested-by: Charlie Jenkins <[email protected]>
Reviewed-by: Himanshu Chauhan <[email protected]>
Tested-by: Himanshu Chauhan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

0 files changed, 0 insertions, 0 deletions