[Backport v3.7-branch] arch: riscv: isr.S: restore s0 before jumping to z_riscv_fatal_error_csf
#79299
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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 <[email protected]> Signed-off-by: Yong Cong Sin <[email protected]> (cherry picked from commit 4bbc2a7)
Test if callee-saved-registers values are as expected. Signed-off-by: David Reiss <[email protected]> Signed-off-by: Yong Cong Sin <[email protected]> (cherry picked from commit 4da4ee8)
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Backport 4da4ee8~2..4da4ee8 from #79096.
Fixes #79298