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Introduce ELF CPU extractor and simulator options.
Add a python script that extracts the ARC CPU name and XLEN from an ELF file by parsing the .ARC.attributes section. The script maps CPU names to simulator options. Currently only NSIM options are supported, but the design allows for future expansion to other simulators. Signed-off-by: Luis Silva <luiss@synopsys.com>
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‎Makefile.in‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -145,7 +145,7 @@ endif
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ifeq ($(SIM),qemu)
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# Using qemu simulator.
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SIM_STAMP:= stamps/build-qemu
148-
SIM_PATH:=$(srcdir)/scripts/wrapper/$(SIM)
148+
SIM_PATH:=$(srcdir)/scripts/wrapper/$(SIM):$(srcdir)/scripts
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SIM_PREPARE:=PATH="$(SIM_PATH):$(INSTALL_DIR)/bin:$(PATH)" ARC_SYSROOT="$(SYSROOT)" DEJAGNU="$(srcdir)/dejagnu/site.exp" QEMU_CPU="$(QEMU_CPU)"
150150
ifeq (@default_target@,baremetal)
151151
SIM_PREPARE:=$(SIM_PREPARE) DEJAGNU_SIM_OPTIONS="-Wq,-semihosting"
@@ -157,7 +157,7 @@ ifeq ($(SIM),nsim)
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$(error nSIM not supported)
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endif
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SIM_STAMP:= nsim-validation
160-
SIM_PATH:=$(srcdir)/scripts/wrapper/$(SIM)
160+
SIM_PATH:=$(srcdir)/scripts/wrapper/$(SIM):$(srcdir)/scripts
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SIM_PREPARE:=PATH="$(SIM_PATH):$(INSTALL_DIR)/bin:$(PATH)" ARC_SYSROOT="$(SYSROOT)" DEJAGNU="$(srcdir)/dejagnu/site.exp" QEMU_CPU="$(QEMU_CPU)"
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else
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$(error Only support SIM=nsim, or SIM=qemu (default))

‎scripts/mcpu-to-cpu-opts‎

Lines changed: 239 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,239 @@
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#!/usr/bin/env python3
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import argparse
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import sys
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import elftools.elf.elffile
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import elftools.elf.sections
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CPU_OPTIONS = {
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"name": "",
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"xlen": "",
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}
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nsim_opts = {
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"arc600": [
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"-p nsim_isa_family=a600",
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"-p nsim_isa_core=6",
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"-on nsim_isa_sat",
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"-p nsim_isa_bitscan_option=0"
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],
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"arc700": [
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"-p nsim_isa_family=a700",
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"-on nsim_isa_sat",
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"-on nsim_isa_mpy32"
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],
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"arcem": [
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"-p nsim_isa_family=av2em",
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"-p nsim_isa_core=3",
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"-on nsim_isa_sat",
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"-p nsim_isa_code_density_option=2",
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"-p nsim_isa_mpy_option=2",
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"-p nsim_isa_bitscan_option=0"
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],
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"archs": [
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"-p nsim_isa_family=av2hs",
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"-p nsim_isa_core=3",
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"-on nsim_isa_sat",
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"-p nsim_isa_atomic_option=1",
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"-p nsim_isa_code_density_option=2",
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"-p nsim_isa_div_rem_option=2",
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"-p nsim_isa_ll64_option=1",
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"-p nsim_isa_mpy_option=2"
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],
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"em": [
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"-p nsim_isa_family=av2em",
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"-p nsim_isa_core=3",
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"-on nsim_isa_sat",
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"-p nsim_isa_shift_option=0",
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"-p nsim_isa_bitscan_option=0"
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],
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"em4_fpuda": [
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"-p nsim_isa_family=av2em",
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"-p nsim_isa_core=3",
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"-on nsim_isa_sat",
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"-p nsim_isa_code_density_option=2",
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"-p nsim_isa_div_rem_option=2",
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"-p nsim_isa_fpuda_option=1",
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"-p nsim_isa_fpus_option=1",
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"-p nsim_isa_mpy_option=2"
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],
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"hs": [
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"-p nsim_isa_family=av2hs",
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"-p nsim_isa_core=3",
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"-on nsim_isa_sat",
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"-p nsim_isa_atomic_option=1",
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"-p nsim_isa_code_density_option=2"
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],
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"hs34": [
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"-p nsim_isa_family=av2hs",
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"-p nsim_isa_core=3",
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"-on nsim_isa_sat",
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"-p nsim_isa_atomic_option=1",
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"-p nsim_isa_code_density_option=2",
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"-p nsim_isa_mpy_option=2"
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],
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"hs38_linux": [
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"-p nsim_isa_family=av2hs",
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"-p nsim_isa_core=3",
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"-on nsim_isa_sat",
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"-p nsim_isa_atomic_option=1",
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"-p nsim_isa_code_density_option=2",
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"-p nsim_isa_div_rem_option=2",
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"-p nsim_isa_fpud_option=1",
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"-p nsim_isa_fpud_div_option=1",
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"-p nsim_isa_fpu_mac_option=1",
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"-p nsim_isa_fpus_option=1",
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"-p nsim_isa_fpus_div_option=1",
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"-p nsim_isa_fpu_mac_option=1",
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"-p nsim_isa_ll64_option=1",
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"-p nsim_isa_mpy_option=9"
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],
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"hs4xd": [
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"-p nsim_isa_family=av2hs",
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"-p nsim_isa_core=3",
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"-on nsim_isa_sat",
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"-p nsim_isa_atomic_option=1",
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"-p nsim_isa_code_density_option=2",
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"-p nsim_isa_div_rem_option=2",
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"-p nsim_isa_ll64_option=1",
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"-p nsim_isa_mpy_option=9"
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],
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"hs58": [
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"-prop=nsim_hlink_gnu_io_ext=1",
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"-p nsim_isa_family=av3hs",
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"-p nsim_isa_pc_size=32",
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"-p nsim_isa_addr_size=32",
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"-p nsim_isa_swap_option=1",
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"-p nsim_isa_bitscan_option=1",
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"-p nsim_isa_div_rem_option=2",
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"-p nsim_isa_mpy_option=9",
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"-p nsim_isa_unaligned_option=1",
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"-p nsim_isa_atomic_option=1",
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"-p nsim_isa_ll64_option=1",
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"-p nsim_isa_fp_wide_option=1",
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"-p nsim_isa_shift_option=0",
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"-p nsim_isa_bitscan_option=0"
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],
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"hs5x": [
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"-prop=nsim_hlink_gnu_io_ext=1",
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"-p nsim_isa_family=av3hs",
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"-p nsim_isa_pc_size=32",
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"-p nsim_isa_addr_size=32",
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"-p nsim_isa_swap_option=1",
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"-p nsim_isa_bitscan_option=1",
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"-p nsim_isa_div_rem_option=2",
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"-p nsim_isa_mpy_option=9",
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"-p nsim_isa_unaligned_option=1",
127+
"-p nsim_isa_atomic_option=1",
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"-p nsim_isa_fp_wide_option=1",
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"-p nsim_isa_shift_option=0",
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"-p nsim_isa_bitscan_option=0"
131+
],
132+
"hs68": [
133+
"-prop=nsim_hlink_gnu_io_ext=1",
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"-p nsim_isa_family=arc64",
135+
"-p nsim_isa_div_rem_option=2",
136+
"-p nsim_isa_mpy_option=9",
137+
"-p nsim_isa_mpy64=1",
138+
"-p nsim_isa_div64_option=1",
139+
"-p nsim_isa_has_fp=1",
140+
"-p nsim_isa_fp_vec_option=1",
141+
"-p nsim_isa_fp_hp_option=1",
142+
"-p nsim_isa_fp_dp_option=1",
143+
"-p nsim_isa_fp_div_option=1",
144+
"-p nsim_isa_fp_num_regs=32",
145+
"-p nsim_isa_unaligned_option=1",
146+
"-p nsim_isa_atomic_option=1",
147+
"-p nsim_isa_m128_option=1",
148+
"-p nsim_isa_fp_wide_option=1",
149+
"-p nsim_isa_shift_option=0",
150+
"-p nsim_isa_bitscan_option=0"
151+
],
152+
"hs6x": [
153+
"-prop=nsim_hlink_gnu_io_ext=1",
154+
"-p nsim_isa_family=arc64",
155+
"-p nsim_isa_div_rem_option=2",
156+
"-p nsim_isa_mpy_option=9",
157+
"-p nsim_isa_mpy64=1",
158+
"-p nsim_isa_div64_option=1",
159+
"-p nsim_isa_has_fp=1",
160+
"-p nsim_isa_fp_vec_option=1",
161+
"-p nsim_isa_fp_hp_option=1",
162+
"-p nsim_isa_fp_dp_option=1",
163+
"-p nsim_isa_fp_div_option=1",
164+
"-p nsim_isa_fp_num_regs=32",
165+
"-p nsim_isa_unaligned_option=1",
166+
"-p nsim_isa_atomic_option=1",
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"-p nsim_isa_fp_wide_option=1",
168+
"-p nsim_isa_shift_option=0",
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"-p nsim_isa_bitscan_option=0"
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]
171+
}
172+
173+
def print_nsim_opts():
174+
cpu_name = CPU_OPTIONS["name"]
175+
opts = " ".join(nsim_opts[cpu_name])
176+
return opts
177+
178+
def open_elf(path):
179+
try:
180+
elffile = elftools.elf.elffile.ELFFile(open(path, 'rb'))
181+
except elftools.common.exceptions.ELFError:
182+
raise Exception("%s is not ELF file!" % path)
183+
return elffile
184+
185+
def get_xlen(path):
186+
elffile = open_elf(path)
187+
return elffile.elfclass
188+
189+
def get_arc_cpu_name_bits(path):
190+
elffile = open_elf(path)
191+
192+
sec = elffile.get_section_by_name(".ARC.attributes")
193+
if not sec:
194+
raise RuntimeError(".ARC.attributes section not found")
195+
196+
data = sec.data()
197+
for i, b in enumerate(data):
198+
if b == 0x07: # Tag_ARC_CPU_name
199+
# Extract following null-terminated string
200+
j = i + 1
201+
while j < len(data) and data[j] != 0:
202+
j += 1
203+
return data[i+1:j].decode()
204+
205+
raise RuntimeError("CPU name not found")
206+
207+
def parse_elf_file(elf_file_path):
208+
xlen = get_xlen(elf_file_path)
209+
cpu_name = get_arc_cpu_name_bits(elf_file_path)
210+
CPU_OPTIONS["name"] = cpu_name
211+
CPU_OPTIONS["xlen"] = xlen
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213+
def parse_opt(argv):
214+
parser = argparse.ArgumentParser()
215+
parser.add_argument('--elf-file-path', type=str)
216+
parser.add_argument('--print-xlen', action='store_true', default=False)
217+
parser.add_argument('--print-cpu', action='store_true', default=False)
218+
parser.add_argument('--print-nsim-opts', action='store_true', default=False)
219+
opt = parser.parse_args()
220+
return opt
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def main(argv):
223+
opt = parse_opt(argv)
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225+
parse_elf_file(opt.elf_file_path)
226+
227+
if opt.print_xlen:
228+
print(CPU_OPTIONS['xlen'])
229+
return
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231+
if opt.print_cpu:
232+
print(CPU_OPTIONS['name'])
233+
return
234+
235+
if opt.print_nsim_opts:
236+
print(print_nsim_opts())
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238+
if __name__ == '__main__':
239+
sys.exit(main(sys.argv))

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