diff --git a/Makefile b/Makefile
index 721ed25e1f..16b27f79dd 100644
--- a/Makefile
+++ b/Makefile
@@ -446,7 +446,7 @@ qemu-version.h: FORCE
 		else \
 			if test -d .git; then \
 				pkgvers=$$(git rev-parse --short HEAD 2>/dev/null | tr -d '\n');\
-				if ! git diff-index --quiet HEAD &>/dev/null; then \
+				if ! git diff --quiet HEAD >/dev/null 2>&1; then \
 					pkgvers="$${pkgvers}-dirty"; \
 				fi; \
 			fi; \
diff --git a/build.sh b/build.sh
index be07f506b8..07d324c771 100755
--- a/build.sh
+++ b/build.sh
@@ -44,7 +44,7 @@ set -x # Print commands from now on
 	--enable-debug \
 	--extra-cflags="$CFLAGS_COMMON $CFLAGS" \
 	$CONFIGURE \
-    --target-list=i386-softmmu \
+	--target-list=i386-softmmu \
 	--enable-sdl \
 	--with-sdlabi=2.0 \
 	--disable-curl \
@@ -60,6 +60,7 @@ set -x # Print commands from now on
 	--disable-libiscsi \
 	--disable-spice \
 	--disable-user \
+	--disable-stack-protector \
 
 time make -j`nproc` 2>&1 | tee build.log
 
diff --git a/hw/xbox/nv2a/nv2a_vsh.c b/hw/xbox/nv2a/nv2a_vsh.c
index 780e46321a..1552e1c70b 100644
--- a/hw/xbox/nv2a/nv2a_vsh.c
+++ b/hw/xbox/nv2a/nv2a_vsh.c
@@ -674,13 +674,25 @@ static const char* vsh_header =
     "#define EXP(dest, mask, src) dest.mask = _EXP(_in(src).x).mask\n"
     "vec4 _EXP(float src)\n"
     "{\n"
-    "  return vec4(exp2(src));\n"
+    "  vec4 result;\n"
+    "  result.x = exp2(floor(src));\n"
+    "  result.y = src - floor(src);\n"
+    "  result.z = exp2(src);\n"
+    "  result.w = 1.0;\n"
+    "  return result;\n"
     "}\n"
     "\n"
     "#define LOG(dest, mask, src) dest.mask = _LOG(_in(src).x).mask\n"
     "vec4 _LOG(float src)\n"
     "{\n"
-    "  return vec4(log2(src));\n"
+    "  float tmp = abs(src);\n"
+    "  if (tmp == 0.0) { return vec4(-INFINITY, 1.0f, -INFINITY, 1.0f); }\n"
+    "  vec4 result;\n"
+    "  result.x = floor(log2(tmp));\n"
+    "  result.y = tmp / exp2(floor(log2(tmp)));\n"
+    "  result.z = log2(tmp);\n"
+    "  result.w = 1.0;\n"
+    "  return result;\n"
     "}\n"
     "\n"
     "#define LIT(dest, mask, src) dest.mask = _LIT(_in(src)).mask\n"
diff --git a/hw/xbox/nvnet.c b/hw/xbox/nvnet.c
index 6de7b75467..efd94ae54c 100644
--- a/hw/xbox/nvnet.c
+++ b/hw/xbox/nvnet.c
@@ -28,6 +28,7 @@
 #define IOPORT_SIZE 0x8
 #define MMIO_SIZE   0x400
 
+// #define DEBUG
 #ifdef DEBUG
 #   define NVNET_DPRINTF(format, ...) printf(format, ## __VA_ARGS__)
 #   define NVNET_DUMP_PACKETS_TO_SCREEN
@@ -692,6 +693,7 @@ static ssize_t nvnet_dma_packet_from_guest(NvNetState *s)
     struct RingDesc desc;
     bool is_last_packet;
     int i;
+    bool packet_sent = false;
 
     for (i = 0; i < s->tx_ring_size; i++) {
         /* Read ring descriptor */
@@ -716,6 +718,7 @@ static ssize_t nvnet_dma_packet_from_guest(NvNetState *s)
         pci_dma_read(&s->dev, desc.packet_buffer,
                               s->txrx_dma_buf, desc.length + 1);
         nvnet_send_packet(s, s->txrx_dma_buf, desc.length + 1);
+        packet_sent = true;
 
         /* Update descriptor */
         is_last_packet = desc.flags & NV_TX_LASTPACKET;
@@ -732,9 +735,11 @@ static ssize_t nvnet_dma_packet_from_guest(NvNetState *s)
     }
 
     /* Trigger interrupt */
-    NVNET_DPRINTF("Triggering interrupt\n");
-    nvnet_set_reg(s, NvRegIrqStatus, NVREG_IRQSTAT_BIT4, 4);
-    nvnet_update_irq(s);
+    if (packet_sent) {
+        NVNET_DPRINTF("Triggering interrupt\n");
+        nvnet_set_reg(s, NvRegIrqStatus, NVREG_IRQSTAT_BIT4, 4);
+        nvnet_update_irq(s);
+    }
 
     return 0;
 }