arch: riscv: isr.S: restore s0 before jumping to z_riscv_fatal_error_csf
#79096
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Restore the s0 we saved early in ISR entry so it shows up properly in the CSF. Signed-off-by: David Reiss <dreiss@meta.com> Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Test if callee-saved-registers values are as expected. Signed-off-by: David Reiss <dreiss@meta.com> Signed-off-by: Yong Cong Sin <ycsin@meta.com>
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Made by @dreiss in our internal fork:
Restore the s0 we saved early in ISR entry so it shows up properly in the CSF.