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| author | Prashanth Mundkur <prashanth.mundkur@gmail.com> | 2019-09-18 09:48:27 -0700 |
|---|---|---|
| committer | Prashanth Mundkur <prashanth.mundkur@gmail.com> | 2019-09-18 09:48:27 -0700 |
| commit | ba18f0f59cee8e3c32cfaa980c0d109399284844 (patch) | |
| tree | 00fab37e49d117cf8f19075b9b3609b424b33e99 /doc | |
| parent | 8c418a0255f51bf2f9283de6117f8c34630b018b (diff) | |
| download | sail-riscv-ba18f0f59cee8e3c32cfaa980c0d109399284844.zip sail-riscv-ba18f0f59cee8e3c32cfaa980c0d109399284844.tar.gz sail-riscv-ba18f0f59cee8e3c32cfaa980c0d109399284844.tar.bz2 | |
Update docs on extension support for disabling RVC.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/ExtendingGuide.md | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/ExtendingGuide.md b/doc/ExtendingGuide.md index 60e45db..83f31c9 100644 --- a/doc/ExtendingGuide.md +++ b/doc/ExtendingGuide.md @@ -124,6 +124,12 @@ An extension might want to similarly check and transform accesses to the program counter. This is supported by supplying implementations of the functions defined in `riscv_pc_access.sail`. +In addition, dynamically enabling and disabling the RVC extension has +an effect on legal PC alignment; in particular, attempts to disable +RVC are ignored if the PC becomes unaligned in the base architecture. +Extensions can also veto these attempts by appropriately defining +`ext_veto_disable_C`. + Adding new instructions ----------------------- |