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update mnemonics of c.mop and update ssrdp to mop.r.28 #161

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Oct 6, 2023
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update mnemonics of c.mop and update ssrdp to mop.r.28 #161

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16 changes: 8 additions & 8 deletions cfi_backward.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -85,15 +85,15 @@ The Zicfiss extension depends on the A, Zicsr, Zimop, and Zcmop extensions.
The Zicfiss extension introduces the following instructions:

* Push to the shadow stack (See <<SS_PUSH>>)
** `SSPUSH x1` and `SSPUSH x5` - encoded using `MOP.R.7`
** `C.SSPUSH x1` - encoded using `C.MOP.0`
** `SSPUSH x1` and `SSPUSH x5` - encoded using `MOP.RR.7`
** `C.SSPUSH x1` - encoded using `C.MOP.1`

* Pop from the shadow stack (See <<SS_POP>>)
** `SSPOPCHK x1` and `SSPOPCHK x5` - encoded using `mop.rr.28`
** `C.SSPOPCHK x5` - encoded using `c.mop.2`
** `SSPOPCHK x1` and `SSPOPCHK x5` - encoded using `MOP.R.28`
** `C.SSPOPCHK x5` - encoded using `C.MOP.5`

* Read the value of `ssp` into a register (See <<SSP_READ>>)
** `SSRDP` - encoded using `mop.r.0`
** `SSRDP` - encoded using `MOP.R.28`

* Perform an atomic swap from a shadow stack location (See <<SSAMOSWAP>>)
** `SSAMOSWAP`
Expand Down Expand Up @@ -324,7 +324,7 @@ followed by a write of the link register at the new top of the shadow stack.

Only `x1` and `x5` encodings are supported as `rs2` for `SSPUSH`. Zicfiss
provides 16-bit versions of the `SSPUSH x1` instruction using the Zcmop
defined `c.mop.0` encoding. The `C.SSPUSH x1` expands to `SSPUSH x1`.
defined `C.MOP.1` encoding. The `C.SSPUSH x1` expands to `SSPUSH x1`.

The `SSPUSH` instruction and its compressed form `C.SSPUSH` can be used, to push
a link register on the shadow stack. The `SSPUSH` and `C.SSPUSH` instructions
Expand Down Expand Up @@ -385,7 +385,7 @@ current top of the shadow stack followed by an increment of the `ssp` by
....

Only `x1` and `x5` encodings are supported as `rs1` for `SSPOPCHK`. Zicfiss
provides a 16-bit version of the `SSPOPCHK x5` using Zcmop define `c.mop.2`
provides a 16-bit version of the `SSPOPCHK x5` using Zcmop define `C.MOP.5`
encoding. The `C.SSPOPCHK x5` expands to `SSPOPCHK x5`.

Usually programs with a shadow stack push the return address onto the regular
Expand Down Expand Up @@ -590,7 +590,7 @@ register.
{bits: 5, name: 'rd', attr:['dst']},
{bits: 3, name: 'funct3', attr:['100']},
{bits: 5, name: '00000'},
{bits: 12, name: '100000011100', attr:['SSRDP']},
{bits: 12, name: '110011011100', attr:['SSRDP']},
], config:{lanes: 1, hspace:1024}}
....

Expand Down