Add --get-elf-class for march-to-cpu-opt

scripts/march-to-cpu-opt

@@ -30,6 +30,7 @@ def parse_opt(argv):
     parser.add_argument('-march', '--with-arch', type=str, dest='march')
     parser.add_argument('-selftest', action='store_true')
     parser.add_argument('--get-riscv-tag', type=str)
+    parser.add_argument('--get-elf-class', type=str)
     opt = parser.parse_args()
     return opt
 
@@ -160,11 +161,19 @@ class TestArchStringParse(unittest.TestCase):
 def selftest():
     unittest.main(argv=sys.argv[1:])
 
-def read_arch_attr (path):
+def open_elf(path):
     try:
         elffile = elftools.elf.elffile.ELFFile(open(path, 'rb'))
     except elftools.common.exceptions.ELFError:
         raise Exception("%s is not ELF file!" % path)
+    return elffile
+
+def read_elf_class(path):
+    elffile = open_elf(path)
+    return elffile.elfclass
+
+def read_arch_attr (path):
+    elffile = open_elf(path)
 
     attr_sec = elffile.get_section_by_name(".riscv.attributes")
     if attr_sec:
@@ -200,8 +209,12 @@ def main(argv):
     if opt.selftest:
         selftest()
         return 0
-    if (opt.with_elf):
-        march = read_arch_attr (opt.with_elf)
+    if (opt.get_elf_class):
+        elf_class = read_elf_class (opt.get_elf_class)
+        print (elf_class)
+        return
+    if (opt.get_riscv_tag):
+        march = read_arch_attr (opt.get_riscv_tag)
     else:
         march = opt.march
     cpu_opt = conver_arch_to_qemu_cpu_opt(march)

scripts/wrapper/qemu/riscv64-unknown-linux-gnu-run

@@ -10,6 +10,6 @@ do
     shift
 done
 
-xlen="$(readelf -h $1 | grep 'Class' | cut -d: -f 2 | xargs echo | sed 's/^ELF//')"
+xlen="$(march-to-cpu-opt --get-elf-class $1)"
 
 QEMU_CPU="$(march-to-cpu-opt --get-riscv-tag $1)" qemu-riscv$xlen -r 5.10 "${qemu_args[@]}" -L ${RISC_V_SYSROOT} "$@"