[ltt-dev] [PATCH 05/13] read basic type from ltt-relay buffer

[Lai Jiangshan]

we need function read the base type from ltt-relay buffer
in the kernel for text output

Signed-off-by: Lai Jiangshan <laijs at cn.fujitsu.com>
---
 ltt-serialize.c |   71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
diff --git a/ltt/ltt-serialize.c b/ltt/ltt-serialize.c
index 5c34899..deb9106 100644
--- a/ltt/ltt-serialize.c
+++ b/ltt/ltt-serialize.c
@@ -531,6 +538,77 @@
 }
 EXPORT_SYMBOL_GPL(ltt_serialize_data);
 
+static inline u64 serialize_read_base_type(struct rchan_buf *buf, size_t *ppos,
+		char trace_size, enum ltt_type trace_type)
+{
+	union {
+		uint8_t  u_8;
+		uint16_t u_16;
+		uint32_t u_32;
+		uint64_t u_64;
+		int8_t   s_8;
+		int16_t  s_16;
+		int32_t  s_32;
+		int64_t  s_64;
+	} tmp;
+	uint64_t value;
+
+	if (ltt_get_alignment())
+		*ppos += ltt_align(*ppos, trace_size);
+
+	switch (trace_type) {
+	case LTT_TYPE_SIGNED_INT:
+		switch (trace_size) {
+		case 1:
+			ltt_relay_read(buf, *ppos, &tmp.s_8, trace_size);
+			value = tmp.s_8;
+			break;
+		case 2:
+			ltt_relay_read(buf, *ppos, &tmp.s_16, trace_size);
+			value = tmp.s_16;
+			break;
+		case 4:
+			ltt_relay_read(buf, *ppos, &tmp.s_32, trace_size);
+			value = tmp.s_32;
+			break;
+		case 8:
+			ltt_relay_read(buf, *ppos, &tmp.s_64, trace_size);
+			value = tmp.s_64;
+			break;
+		default:
+			BUG();
+		}
+		break;
+	case LTT_TYPE_UNSIGNED_INT:
+		switch (trace_size) {
+		case 1:
+			ltt_relay_read(buf, *ppos, &tmp.u_8, trace_size);
+			value = tmp.u_8;
+			break;
+		case 2:
+			ltt_relay_read(buf, *ppos, &tmp.u_16, trace_size);
+			value = tmp.u_16;
+			break;
+		case 4:
+			ltt_relay_read(buf, *ppos, &tmp.u_32, trace_size);
+			value = tmp.u_32;
+			break;
+		case 8:
+			ltt_relay_read(buf, *ppos, &tmp.u_64, trace_size);
+			value = tmp.u_64;
+			break;
+		default:
+			BUG();
+		}
+		break;
+	default:
+		BUG();
+	}
+
+	*ppos += trace_size;
+	return value;
+}
+
 /*
  * Calculate data size
  * Assume that the padding for alignment starts at a sizeof(void *) address.