More controlled simpset setup, so we don't get warnings if we have
bit_simps in the simpset already.
Signed-off-by: Gerwin Klein <gerwin.klein@proofcraft.systems>
The theory import order is important for name shadowing, including
default rules for induction and cases. This commit makes sure we
get the Word_Lib version by default, not the HOL.Word version.
Signed-off-by: Gerwin Klein <gerwin.klein@proofcraft.systems>
Terms of the form "of_nat x = 0" get rewritten into
"~x dvd 2^LENGTH('a)", which is almost never what you want for
concrete word sizes. This bundle makes it easy to remove those rules
locally.
Signed-off-by: Gerwin Klein <gerwin.klein@proofcraft.systems>
Word_32 and Word_64 shouldn't be included at the same time, they
both define default word_size and other notions. This commit refactors
them to be usable independently and also makes the type names available
independently from all of the Word_x theories.
Signed-off-by: Gerwin Klein <gerwin.klein@data61.csiro.au>
This includes a tweak to Word_Lib to simplify ucast(-1) which
is now a term that occurs more often.
Signed-off-by: Gerwin Klein <gerwin.klein@data61.csiro.au>
`register_t` only needs to be able to index into the TCB user context
array, which has 35 entries on RISC-V. Therefore `uint8_t` is
sufficient.
Using the smallest possible type for `register_t` helps with binary
verification. This shrinks static read-only data, which in turn reduces
the complexity of binary verification proof search.
This commit verifies the corresponding C kernel patch.
Co-authored-by: Zoltan Kocsis <Zoltan.Kocsis@data61.csiro.au>
Signed-off-by: Mitchell Buckley <Mitchell.Buckley@data61.csiro.au>
Signed-off-by: Zoltan Kocsis <Zoltan.Kocsis@data61.csiro.au>
In Isabelle2020, when isabelle jedit is started without a session
context, e.g. `isabelle jedit -l ASpec`, theory imports with path
references cause the isabelle process to hang.
Since sessions now declare directories, Isabelle can find those files
without path reference and we therefore remove all such path references
from import statements. With this, `jedit` and `build` should work with
and without explicit session context as before.
Signed-off-by: Gerwin Klein <gerwin.klein@data61.csiro.au>
Isabelle2020 requires each session to declare it own set of directories that
may not overlap with other session's directories. This commit reorganises
files to comply with that requirement.
Signed-off-by: Gerwin Klein <gerwin.klein@data61.csiro.au>
unat_ucast_8_64 states that upcasting an 8 word to a 64 word does not
changes its value. We have a generic lemma for this which can be
specialised to this lemma: unat_ucast_up_simp[where 'a=8 and 'b=64,
simplified].
Gerwin Klein
Gerwin Klein
Ryan Barry
Mitchell Buckley
Mitchell Buckley
Matthew Brecknell
Rafal Kolanski
Victor Phan
Edward Pierzchalski
Zoltan Kocsis