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[v6,1/4] include: adding support for Zicfilp / Zicfiss encodings

Message ID 20240916182357.24545-2-debug@rivosinc.com
State Accepted
Headers show
Series zicfilp and zicfiss support in opensbi | expand

Commit Message

Deepak Gupta Sept. 16, 2024, 6:23 p.m. UTC 
Zicfilp / Zicfiss extension (see link) introduces b2 (LPE) in menvcfg CSR to
enable landing pads and b3 (SSE) in menvcfg CSR to enable shadow stack and
landing pad for privilege less than M. Additionally extension introduces new
bits in *status for recording landing pad state and a new exception type
`software check exception` with cause=0x12.

Link: https://github.com/riscv/riscv-cfi

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
---
 include/sbi/riscv_encoding.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/include/sbi/riscv_encoding.h b/include/sbi/riscv_encoding.h
index 2ed05f2..fa1d373 100644
--- a/include/sbi/riscv_encoding.h
+++ b/include/sbi/riscv_encoding.h
@@ -32,6 +32,7 @@ 
 #define MSTATUS_TVM			_UL(0x00100000)
 #define MSTATUS_TW			_UL(0x00200000)
 #define MSTATUS_TSR			_UL(0x00400000)
+#define MSTATUS_SPELP		_UL(0x00800000)
 #define MSTATUS32_SD			_UL(0x80000000)
 #if __riscv_xlen == 64
 #define MSTATUS_UXL			_ULL(0x0000000300000000)
@@ -41,12 +42,14 @@ 
 #define MSTATUS_GVA			_ULL(0x0000004000000000)
 #define MSTATUS_GVA_SHIFT		38
 #define MSTATUS_MPV			_ULL(0x0000008000000000)
+#define MSTATUS_MPELP		_ULL(0x0000020000000000)
 #else
 #define MSTATUSH_SBE			_UL(0x00000010)
 #define MSTATUSH_MBE			_UL(0x00000020)
 #define MSTATUSH_GVA			_UL(0x00000040)
 #define MSTATUSH_GVA_SHIFT		6
 #define MSTATUSH_MPV			_UL(0x00000080)
+#define MSTATUSH_MPELP			_UL(0x00000200)
 #endif
 #define MSTATUS32_SD			_UL(0x80000000)
 #define MSTATUS64_SD			_ULL(0x8000000000000000)
@@ -220,6 +223,8 @@ 
 #define ENVCFG_CBIE_ILL			_UL(0x0)
 #define ENVCFG_CBIE_FLUSH		_UL(0x1)
 #define ENVCFG_CBIE_INV			_UL(0x3)
+#define ENVCFG_SSE			(_UL(1) << 3)
+#define ENVCFG_LPE			(_UL(1) << 2)
 #define ENVCFG_FIOM			_UL(0x1)
 
 /* ===== User-level CSRs ===== */
@@ -228,6 +233,7 @@ 
 #define CSR_USTATUS			0x000
 #define CSR_UIE				0x004
 #define CSR_UTVEC			0x005
+#define CSR_SSP				0x011
 
 /* User Trap Handling (N-extension) */
 #define CSR_USCRATCH			0x040
@@ -763,6 +769,7 @@ 
 #define CAUSE_FETCH_PAGE_FAULT		0xc
 #define CAUSE_LOAD_PAGE_FAULT		0xd
 #define CAUSE_STORE_PAGE_FAULT		0xf
+#define CAUSE_SW_CHECK_EXCP			0x12
 #define CAUSE_FETCH_GUEST_PAGE_FAULT	0x14
 #define CAUSE_LOAD_GUEST_PAGE_FAULT	0x15
 #define CAUSE_VIRTUAL_INST_FAULT	0x16