tools/syz-cover: use all pcs in Symbols if no rawcover

Change-Id: Ic29ce246932c26a9834a51e143fb0f15f6ba69c6

1 files changed, 15 insertions, 10 deletions

diff --git a/tools/syz-cover/syz-cover.go b/tools/syz-cover/syz-cover.go
index 72cd2a7a4..76283b5fd 100644
--- a/tools/syz-cover/syz-cover.go
+++ b/tools/syz-cover/syz-cover.go
@@ -14,6 +14,10 @@
 // Usage:
 //
 //	syz-cover -config config_file rawcover.file*
+//
+// or use all pcs in rg.Symbols
+//
+//	syz-cover -config config_file
 package main
 
 import (
@@ -21,7 +25,6 @@ import (
 	"bytes"
 	"encoding/json"
 	"flag"
-	"fmt"
 	"os"
 	"os/exec"
 	"strconv"
@@ -44,19 +47,10 @@ func main() {
 	)
 	defer tool.Init()()
 
-	if len(flag.Args()) == 0 {
-		fmt.Fprintf(os.Stderr, "usage: syz-cover [flags] rawcover.file\n")
-		flag.PrintDefaults()
-		os.Exit(1)
-	}
 	cfg, err := mgrconfig.LoadFile(*flagConfig)
 	if err != nil {
 		tool.Fail(err)
 	}
-	pcs, err := readPCs(flag.Args())
-	if err != nil {
-		tool.Fail(err)
-	}
 	var modules []host.KernelModule
 	if *flagModules != "" {
 		m, err := loadModules(*flagModules)
@@ -69,6 +63,17 @@ func main() {
 	if err != nil {
 		tool.Fail(err)
 	}
+	var pcs []uint64
+	if len(flag.Args()) == 0 {
+		for _, s := range rg.Symbols {
+			pcs = append(pcs, s.PCs...)
+		}
+	} else {
+		pcs, err = readPCs(flag.Args())
+		if err != nil {
+			tool.Fail(err)
+		}
+	}
 	progs := []cover.Prog{{PCs: pcs}}
 	buf := new(bytes.Buffer)
 	if *flagExportCSV != "" {