Added function of parsing data stream from windbg to packet.
Signed-off-by: Mihail Abakumov <mikhail.abaku...@ispras.ru>
Signed-off-by: Pavel Dovgalyuk <dovga...@ispras.ru>
Signed-off-by: Dmitriy Koltunov <koltu...@ispras.ru>
---
windbgstub.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 110 insertions(+), 1 deletion(-)
diff --git a/windbgstub.c b/windbgstub.c
index 32984d0f92..7bc3585e53 100755
--- a/windbgstub.c
+++ b/windbgstub.c
@@ -57,6 +57,105 @@ typedef struct WindbgState {
static WindbgState *windbg_state;
+static void windbg_ctx_handler(ParsingContext *ctx)
+{}
+
+static void windbg_read_byte(ParsingContext *ctx, uint8_t byte)
+{
+ switch (ctx->state) {
+ case STATE_LEADER:
+ ctx->result = RESULT_NONE;
+ if (byte == PACKET_LEADER_BYTE || byte == CONTROL_PACKET_LEADER_BYTE) {
+ if (ctx->index > 0 && byte != PTR(ctx->packet.PacketLeader)[0]) {
+ ctx->index = 0;
+ }
+ PTR(ctx->packet.PacketLeader)[ctx->index] = byte;
+ ++ctx->index;
+ if (ctx->index == sizeof(ctx->packet.PacketLeader)) {
+ ctx->state = STATE_PACKET_TYPE;
+ ctx->index = 0;
+ }
+ } else if (byte == BREAKIN_PACKET_BYTE) {
+ ctx->result = RESULT_BREAKIN_BYTE;
+ ctx->index = 0;
+ } else {
+ ctx->index = 0;
+ }
+ break;
+
+ case STATE_PACKET_TYPE:
+ PTR(ctx->packet.PacketType)[ctx->index] = byte;
+ ++ctx->index;
+ if (ctx->index == sizeof(ctx->packet.PacketType)) {
+ ctx->packet.PacketType = lduw_p(&ctx->packet.PacketType);
+ if (ctx->packet.PacketType >= PACKET_TYPE_MAX) {
+ ctx->state = STATE_LEADER;
+ ctx->result = RESULT_UNKNOWN_PACKET;
+ } else {
+ ctx->state = STATE_PACKET_BYTE_COUNT;
+ }
+ ctx->index = 0;
+ }
+ break;
+
+ case STATE_PACKET_BYTE_COUNT:
+ PTR(ctx->packet.ByteCount)[ctx->index] = byte;
+ ++ctx->index;
+ if (ctx->index == sizeof(ctx->packet.ByteCount)) {
+ ctx->packet.ByteCount = lduw_p(&ctx->packet.ByteCount);
+ ctx->state = STATE_PACKET_ID;
+ ctx->index = 0;
+ }
+ break;
+
+ case STATE_PACKET_ID:
+ PTR(ctx->packet.PacketId)[ctx->index] = byte;
+ ++ctx->index;
+ if (ctx->index == sizeof(ctx->packet.PacketId)) {
+ ctx->packet.PacketId = ldl_p(&ctx->packet.PacketId);
+ ctx->state = STATE_PACKET_CHECKSUM;
+ ctx->index = 0;
+ }
+ break;
+
+ case STATE_PACKET_CHECKSUM:
+ PTR(ctx->packet.Checksum)[ctx->index] = byte;
+ ++ctx->index;
+ if (ctx->index == sizeof(ctx->packet.Checksum)) {
+ ctx->packet.Checksum = ldl_p(&ctx->packet.Checksum);
+ if (ctx->packet.PacketLeader == CONTROL_PACKET_LEADER) {
+ ctx->state = STATE_LEADER;
+ ctx->result = RESULT_CONTROL_PACKET;
+ } else if (ctx->packet.ByteCount > PACKET_MAX_SIZE) {
+ ctx->state = STATE_LEADER;
+ ctx->result = RESULT_ERROR;
+ } else {
+ ctx->state = STATE_PACKET_DATA;
+ }
+ ctx->index = 0;
+ }
+ break;
+
+ case STATE_PACKET_DATA:
+ ctx->data.buf[ctx->index] = byte;
+ ++ctx->index;
+ if (ctx->index == ctx->packet.ByteCount) {
+ ctx->state = STATE_TRAILING_BYTE;
+ ctx->index = 0;
+ }
+ break;
+
+ case STATE_TRAILING_BYTE:
+ if (byte == PACKET_TRAILING_BYTE) {
+ ctx->result = RESULT_DATA_PACKET;
+ } else {
+ ctx->result = RESULT_ERROR;
+ }
+ ctx->state = STATE_LEADER;
+ break;
+ }
+}
+
static int windbg_chr_can_receive(void *opaque)
{
return PACKET_MAX_SIZE;
@@ -64,8 +163,18 @@ static int windbg_chr_can_receive(void *opaque)
static void windbg_chr_receive(void *opaque, const uint8_t *buf, int size)
{
+ static ParsingContext ctx = {
+ .state = STATE_LEADER,
+ .result = RESULT_NONE,
+ .name = ""
+ };
+
if (windbg_state->is_loaded) {
- /* T0D0: parse data */
+ int i;
+ for (i = 0; i < size; i++) {
+ windbg_read_byte(&ctx, buf[i]);
+ windbg_ctx_handler(&ctx);
+ }
}
}
