Add Zicfiss extension from CFI extension, v0.4.0

1. Add EXT_ZICFISS for enable Zicfiss with zicfiss extension name.
2. Add new software exception with tval 3 for shadow stack.
3. Implement sspush_x1/sspush_x5/sspopchk_x1/sspopchk_x5/ssrdp/ssamoswap_w/ssamoswap_d.
4. Implement c_sspush_x1/c_sspopchk_x5 in c_lui.h which has same encoding.
5. Add new special access type ss_access in xlate_flags_t for checking special read/write permission in SS(Shadow Stack) page.
6. Add new ss_load/ss_store/ssamoswap to enable ss_access flag.
7. Check special pte(xwr=010) of SS page.

1 files changed, 7 insertions, 0 deletions

diff --git a/riscv/insns/ssamoswap_d.h b/riscv/insns/ssamoswap_d.h
new file mode 100644
index 0000000..10ea5ef
--- /dev/null
+++ b/riscv/insns/ssamoswap_d.h
@@ -0,0 +1,7 @@
+require_extension(EXT_ZICFISS);
+require_extension('A');
+require_rv64;
+
+DECLARE_XENVCFG_VARS(SSE);
+require_envcfg(SSE);
+WRITE_RD(MMU.ssamoswap<uint64_t>(RS1, RS2));