arm64: Expose ESR_EL1 information to user when SIGSEGV/SIGBUS

This information is useful for instruction emulators to detect
read/write and access size without having to decode the faulting
instruction. The current patch exports it via sigcontext (struct
esr_context) and is only valid for SIGSEGV and SIGBUS.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

2 files changed, 17 insertions, 0 deletions

diff --git a/arch/arm64/include/uapi/asm/sigcontext.h b/arch/arm64/include/uapi/asm/sigcontext.h
index 690ad51cc901..b72cf405b3fe 100644
--- a/arch/arm64/include/uapi/asm/sigcontext.h
+++ b/arch/arm64/include/uapi/asm/sigcontext.h
@@ -53,5 +53,12 @@ struct fpsimd_context {
         __uint128_t vregs[32];
 };
 
+/* ESR_EL1 context */
+#define ESR_MAGIC       0x45535201
+
+struct esr_context {
+        struct _aarch64_ctx head;
+        u64 esr;
+};
 
 #endif /* _UAPI__ASM_SIGCONTEXT_H */
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index 7ff2eee96c6b..dc2ab1b0ac0d 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -194,6 +194,16 @@ static int setup_sigframe(struct rt_sigframe __user *sf,
                 aux += sizeof(*fpsimd_ctx);
         }
 
+        /* fault information, if valid */
+        if (current->thread.fault_code) {
+                struct esr_context *esr_ctx =
+                        container_of(aux, struct esr_context, head);
+                __put_user_error(ESR_MAGIC, &esr_ctx->head.magic, err);
+                __put_user_error(sizeof(*esr_ctx), &esr_ctx->head.size, err);
+                __put_user_error(current->thread.fault_code, &esr_ctx->esr, err);
+                aux += sizeof(*esr_ctx);
+        }
+
         /* set the "end" magic */
         end = aux;
         __put_user_error(0, &end->magic, err);