[Backport v3.7-branch] arch: riscv: reset global pointer on exception #81370
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Add macros to read / write hardware registers. Signed-off-by: Yong Cong Sin <ycsin@meta.com> Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com> (cherry picked from commit de3a845)
Reset the gp on exception entry from u-mode to protect the kernel against a possible rogue user thread. Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com> Signed-off-by: Yong Cong Sin <ycsin@meta.com> (cherry picked from commit e30db2d)
Add a test to make sure that the `gp` global pointer register used for relative addressing when `CONFIG_RISCV_GP` is enabled can't be corrupted by a rogue user thread. Signed-off-by: Yong Cong Sin <ycsin@meta.com> Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com> (cherry picked from commit 408c151)
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Backport 408c151~3..408c151 from #81155.
Fixes #81372