diff --git a/src/summary.adoc b/src/summary.adoc index d26184b2..a710f929 100644 --- a/src/summary.adoc +++ b/src/summary.adoc @@ -38,7 +38,7 @@ This means the following state is added: * Tags in registers, caches, and memory: ** Every register has a one-bit tag, indicating whether the capability in the register is valid to be dereferenced. - This tag is cleared if the register is written as an integer. + Among other reasons, this tag is cleared if the register is written as an integer. ** The tags are also tracked through the memory subsystem: every aligned CLEN-bits wide region has a non-addressable one-bit tag, which the hardware manages atomically with the data. The tag is cleared if the memory region is ever written other than using a capability store from a tagged capability register. @@ -58,7 +58,7 @@ Changing the bounds used for instruction fetch or the pointer mode can be as eas <> and <> instructions are also added to allow cheap mode switching. Exception codes are added for CHERI-specific exceptions on fetch, jumps, and memory access. -No other exception paths are added: in particular, capability manipulations do not trap, but may clear the tag on the result capability if the operation is not permitted. +No other exception paths are added: In particular, capability manipulations do not trap, but may clear the tag on the result capability if the operation is not permitted. === Added Instructions @@ -76,7 +76,7 @@ The added instructions can be split into the following categories: === Existing Instructions -Existing RISC-V instructions are largely unmodified: in {cheri_int_mode_name}, there is binary compatibility. +Existing RISC-V instructions are largely unmodified: In {cheri_int_mode_name}, there is binary compatibility. Instructions that access memory, as well as branches and jumps, are automatically checked against <> and <>, raising an exception if the checks fail. However, <> and <> are reset to <> capabilities, meaning the checks will always pass on systems that have not written to CHERI system registers.