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#!/usr/bin/env python3
import argparse
import sys
import unittest
import elftools.elf.elffile
import elftools.elf.enums
import elftools.elf.sections
EXT_OPTS = {
"zba": "zba=true",
"zbb": "zbb=true",
"zbc": "zbc=true",
"zbs": "zbs=true",
"v": "v=true,vext_spec=v1.0",
"zve32f": "Zve32f=true",
"zve64f": "Zve64f=true",
"zfh": "Zfh=true",
"zfhmin": "Zfhmin=true",
"zhinx": "zhinx=true",
"zfinx": "zfinx=true",
"zdinx": "zdinx=true",
}
SUPPORTTED_EXTS = "iemafdcbvph"
MC_EXT_PREFIX = "zsx"
def parse_opt(argv):
parser = argparse.ArgumentParser()
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
def parse_mc_ext(ext_str, idx):
end_idx = ext_str[idx+1:].find('_')
if end_idx == -1:
end_idx = len(ext_str)
else:
end_idx = end_idx + idx + 1
major = 0
minor = 0
version_begin_idx = end_idx
if ext_str[end_idx-1].isdigit():
# This ext is come with version.
v_idx = end_idx - 1
while (ext_str[v_idx].isdigit()) and v_idx > idx:
v_idx -= 1
major = int(ext_str[v_idx+1:end_idx])
version_begin_idx = v_idx+1
if (ext_str[v_idx] == 'p'):
minor = major
major_v_idx = v_idx - 1
while (ext_str[major_v_idx].isdigit()) and major_v_idx > idx:
major_v_idx -= 1
major = int(ext_str[major_v_idx+1:v_idx])
version_begin_idx = major_v_idx+1
return end_idx, ext_str[idx:version_begin_idx], major, minor
def parse_version(ext_str, idx):
major = 2
minor = 0
strlen = len(ext_str)
end_idx = idx + 1
if idx+1 < strlen and ext_str[idx+1].isdigit():
v_idx = idx + 1
while v_idx < strlen and (ext_str[v_idx].isdigit()):
v_idx += 1
major = int(ext_str[idx+1:v_idx])
end_idx = v_idx
if (ext_str[v_idx] == 'p'):
minor_v_idx = v_idx + 1
while minor_v_idx < strlen and (ext_str[minor_v_idx].isdigit()):
minor_v_idx += 1
minor = int(ext_str[v_idx+1:minor_v_idx])
end_idx = minor_v_idx
return end_idx, ext_str[idx], major, minor
def parse_march(march):
if len(march) < 5:
return None
march = march.replace("rv64g", "rv64imafd").replace("rv32g", "rv32imafd")
if march[0:5] not in ['rv64i', 'rv32i', 'rv32e']:
print (march[0:5])
return None
ext_str = march[4:]
idx = 0
extstrlens = len(ext_str)
exts = dict()
while idx < extstrlens:
if ext_str[idx] in SUPPORTTED_EXTS:
idx, ext_name, major, minor = parse_version(ext_str, idx)
elif ext_str[idx] in MC_EXT_PREFIX:
idx, ext_name, major, minor = parse_mc_ext(ext_str, idx)
elif ext_str[idx] == '_':
idx = idx + 1
continue
else:
raise Exception("Unrecognized ext : `%s`, %s" %
(ext_str[idx], ext_str))
exts[ext_name] = (major, minor)
return exts
def get_vlen(ext_dict):
vlen = 0
for ext in ext_dict.keys():
if ext == 'v':
vlen = max(vlen, 128)
elif (ext.startswith('zvl') and ext[-1] == 'b'):
zvlen = int(ext[3:-1])
vlen = max(vlen, zvlen)
elif ext.startswith("zve"):
zvelen = int(ext[3:-1])
vlen = max(vlen, zvelen)
return vlen
def conver_arch_to_qemu_cpu_opt(march):
if len(march) < 5:
return None
ext_dict = parse_march(march)
cpu_opt = []
cpu_opt.append(march[0:4]) # rv32 or rv64
vlen = get_vlen(ext_dict)
if vlen != 0:
cpu_opt.append("vlen=%d" % vlen)
disable_all_fd = False
for ext in ext_dict.keys():
if ext in EXT_OPTS:
cpu_opt.append(EXT_OPTS[ext])
if ext in ['zhinx', 'zfinx', 'zdinx']:
disable_all_fd = True
if disable_all_fd:
cpu_opt.append("f=false")
cpu_opt.append("d=false")
return ",".join(cpu_opt)
class TestArchStringParse(unittest.TestCase):
def _test(self, arch, expected_arch_list, expected_vlen=0):
exts = parse_march(arch)
vlen = get_vlen(exts)
self.assertEqual(expected_vlen, vlen)
self.assertEqual(set(expected_arch_list), set(exts.keys()))
def test_rv64gc(self):
self._test("rv64gc", ['i', 'm', 'a', 'f', 'd', 'c'])
self._test("rv32imc_zve32x", ['i', 'm', 'c', 'zve32x'], expected_vlen=32)
self._test("rv32imc_zve32x_zvl128b", ['i', 'm', 'c', 'zve32x', 'zvl128b'], expected_vlen=128)
def selftest():
unittest.main(argv=sys.argv[1:])
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:
# pyelftools has support RISC-V attribute but not contain in any
# release yet, so use ARMAttributesSection for now...
xattr_section = \
elftools.elf.sections.ARMAttributesSection (
attr_sec.header,
attr_sec.name,
elffile)
for subsec in xattr_section.subsections:
for subsubsec in subsec.subsubsections:
for attr in subsubsec.iter_attributes():
val = attr.value
if (not isinstance(val, str)):
continue
pos32 = val.find("rv32")
pos64 = val.find("rv64")
# MAGIC WORKAROUND
# Some version of pyelftools has issue for parsing
# Tag number = 5, it will wrongly parse it become
# Tag number = 4 + 0x10 + 0x5
if (pos32 == 2) or (pos64 == 2):
val = val[2:]
# End of MAGIC WORKAROUND
if (pos32 != -1 or pos64 != -1):
return val
raise Exception("Not found ELF attribute in %s?" % path)
def main(argv):
opt = parse_opt(argv)
if opt.selftest:
selftest()
return 0
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)
print (cpu_opt)
if __name__ == '__main__':
sys.exit(main(sys.argv))
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