[PATCH] sbi: sbi_domain_context: Fix trap context for domain context switching

[Yu Chien Peter Lin]

Save/restore sbi_trap_context during domain context switching to
ensure proper trap handling and isolation. This maintains correct
domain-specific state, avoiding context corruption.

Fixes: abea949721bc ("lib: sbi: Introduce trap context")
Signed-off-by: Yu Chien Peter Lin <peterlin at andestech.com>
Reviewed-by: Alvin Chang <alvinga at andestech.com>
Tested-by: Alvin Chang <alvinga at andestech.com>
---
 include/sbi/sbi_domain_context.h | 2 +-
 lib/sbi/sbi_domain_context.c     | 9 ++++-----
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/include/sbi/sbi_domain_context.h b/include/sbi/sbi_domain_context.h
index edba764f..0d25884a 100755
--- a/include/sbi/sbi_domain_context.h
+++ b/include/sbi/sbi_domain_context.h
@@ -14,7 +14,7 @@
 /** Context representation for a hart within a domain */
 struct sbi_context {
 	/** Trap-related states such as GPRs, mepc, and mstatus */
-	struct sbi_trap_regs regs;
+	struct sbi_trap_context trap_ctx;
 
 	/** Supervisor status register */
 	unsigned long sstatus;
diff --git a/lib/sbi/sbi_domain_context.c b/lib/sbi/sbi_domain_context.c
index 75285918..49a2f769 100755
--- a/lib/sbi/sbi_domain_context.c
+++ b/lib/sbi/sbi_domain_context.c
@@ -27,7 +27,7 @@ static void switch_to_next_domain_context(struct sbi_context *ctx,
 					  struct sbi_context *dom_ctx)
 {
 	u32 hartindex = sbi_hartid_to_hartindex(current_hartid());
-	struct sbi_trap_regs *trap_regs;
+	struct sbi_trap_context *trap_ctx;
 	struct sbi_domain *current_dom = ctx->dom;
 	struct sbi_domain *target_dom = dom_ctx->dom;
 	struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
@@ -66,10 +66,9 @@ static void switch_to_next_domain_context(struct sbi_context *ctx,
 		ctx->senvcfg	= csr_swap(CSR_SENVCFG, dom_ctx->senvcfg);
 
 	/* Save current trap state and restore target domain's trap state */
-	trap_regs = (struct sbi_trap_regs *)(csr_read(CSR_MSCRATCH) -
-					     SBI_TRAP_REGS_SIZE);
-	sbi_memcpy(&ctx->regs, trap_regs, sizeof(*trap_regs));
-	sbi_memcpy(trap_regs, &dom_ctx->regs, sizeof(*trap_regs));
+	trap_ctx = sbi_trap_get_context(scratch);
+	sbi_memcpy(&ctx->trap_ctx, trap_ctx, sizeof(*trap_ctx));
+	sbi_memcpy(trap_ctx, &dom_ctx->trap_ctx, sizeof(*trap_ctx));
 
 	/* Mark current context structure initialized because context saved */
 	ctx->initialized = true;
-- 
2.34.1