linux-kernel - [PATCH v4 22/30] riscv sigcontext: cfi state struct definition for sigcontext

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Message-ID: <20240912231650.3740732-23-debug@rivosinc.com>
Date: Thu, 12 Sep 2024 16:16:41 -0700
From: Deepak Gupta <debug@...osinc.com>
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Subject: [PATCH v4 22/30] riscv sigcontext: cfi state struct definition for sigcontext

Shadow stack needs to be saved and restored on signal delivery and signal
return.

sigcontext embedded in ucontext is extendible. Defining cfi state in there
which can be used to save cfi state before signal delivery and restore
cfi state on sigreturn

Signed-off-by: Deepak Gupta <debug@...osinc.com>
---
 arch/riscv/include/uapi/asm/sigcontext.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/sigcontext.h b/arch/riscv/include/uapi/asm/sigcontext.h
index cd4f175dc837..c4d19a10651d 100644
--- a/arch/riscv/include/uapi/asm/sigcontext.h
+++ b/arch/riscv/include/uapi/asm/sigcontext.h
@@ -21,6 +21,9 @@ struct __sc_riscv_v_state {
 	struct __riscv_v_ext_state v_state;
 } __attribute__((aligned(16)));
 
+struct __sc_riscv_cfi_state {
+	unsigned long ss_ptr;	/* shadow stack pointer */
+};
 /*
  * Signal context structure
  *
-- 
2.45.0