micropython/tools/mpy_ld.py

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#!/usr/bin/env python3
#
# This file is part of the MicroPython project, http://micropython.org/
#
# The MIT License (MIT)
#
# Copyright (c) 2019 Damien P. George
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
Link .o files to .mpy
"""
import sys, os, struct, re
from elftools.elf import elffile
sys.path.append(os.path.dirname(__file__) + '/../py')
import makeqstrdata as qstrutil
# MicroPython constants
MPY_VERSION = 5
MP_NATIVE_ARCH_X86 = 1
MP_NATIVE_ARCH_X64 = 2
MP_NATIVE_ARCH_ARMV7M = 5
MP_NATIVE_ARCH_ARMV7EMSP = 7
MP_NATIVE_ARCH_ARMV7EMDP = 8
MP_NATIVE_ARCH_XTENSA = 9
MP_NATIVE_ARCH_XTENSAWIN = 10
MP_CODE_BYTECODE = 2
MP_CODE_NATIVE_VIPER = 4
MP_SCOPE_FLAG_VIPERRELOC = 0x10
MP_SCOPE_FLAG_VIPERRODATA = 0x20
MP_SCOPE_FLAG_VIPERBSS = 0x40
MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE = 1
MICROPY_PY_BUILTINS_STR_UNICODE = 2
MP_SMALL_INT_BITS = 31
QSTR_WINDOW_SIZE = 32
# ELF constants
R_386_32 = 1
R_X86_64_64 = 1
R_XTENSA_32 = 1
R_386_PC32 = 2
R_X86_64_PC32 = 2
R_ARM_ABS32 = 2
R_386_GOT32 = 3
R_ARM_REL32 = 3
R_386_PLT32 = 4
R_X86_64_PLT32 = 4
R_XTENSA_PLT = 6
R_386_GOTOFF = 9
R_386_GOTPC = 10
R_ARM_THM_CALL = 10
R_XTENSA_DIFF32 = 19
R_XTENSA_SLOT0_OP = 20
R_ARM_BASE_PREL = 25 # aka R_ARM_GOTPC
R_ARM_GOT_BREL = 26 # aka R_ARM_GOT32
R_ARM_THM_JUMP24 = 30
R_X86_64_REX_GOTPCRELX = 42
R_386_GOT32X = 43
################################################################################
# Architecture configuration
def asm_jump_x86(entry):
return struct.pack('<BI', 0xe9, entry - 5)
def asm_jump_arm(entry):
b_off = entry - 4
if b_off >> 11 == 0 or b_off >> 11 == -1:
# Signed value fits in 12 bits
b0 = 0xe000 | (b_off >> 1 & 0x07ff)
b1 = 0
else:
# Use large jump
b0 = 0xf000 | (b_off >> 12 & 0x07ff)
b1 = 0xb800 | (b_off >> 1 & 0x7ff)
return struct.pack('<HH', b0, b1)
def asm_jump_xtensa(entry):
jump_offset = entry - 4
jump_op = jump_offset << 6 | 6
return struct.pack('<BH', jump_op & 0xff, jump_op >> 8)
class ArchData:
def __init__(self, name, mpy_feature, qstr_entry_size, word_size, arch_got, asm_jump):
self.name = name
self.mpy_feature = mpy_feature
self.qstr_entry_size = qstr_entry_size
self.word_size = word_size
self.arch_got = arch_got
self.asm_jump = asm_jump
self.separate_rodata = name == 'EM_XTENSA' and qstr_entry_size == 4
ARCH_DATA = {
'x86': ArchData(
'EM_386',
MP_NATIVE_ARCH_X86 << 2 | MICROPY_PY_BUILTINS_STR_UNICODE | MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE,
2, 4, (R_386_PC32, R_386_GOT32, R_386_GOT32X), asm_jump_x86,
),
'x64': ArchData(
'EM_X86_64',
MP_NATIVE_ARCH_X64 << 2 | MICROPY_PY_BUILTINS_STR_UNICODE | MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE,
2, 8, (R_X86_64_REX_GOTPCRELX,), asm_jump_x86,
),
'armv7m': ArchData(
'EM_ARM',
MP_NATIVE_ARCH_ARMV7M << 2 | MICROPY_PY_BUILTINS_STR_UNICODE,
2, 4, (R_ARM_GOT_BREL,), asm_jump_arm,
),
'armv7emsp': ArchData(
'EM_ARM',
MP_NATIVE_ARCH_ARMV7EMSP << 2 | MICROPY_PY_BUILTINS_STR_UNICODE,
2, 4, (R_ARM_GOT_BREL,), asm_jump_arm,
),
'armv7emdp': ArchData(
'EM_ARM',
MP_NATIVE_ARCH_ARMV7EMDP << 2 | MICROPY_PY_BUILTINS_STR_UNICODE,
2, 4, (R_ARM_GOT_BREL,), asm_jump_arm,
),
'xtensa': ArchData(
'EM_XTENSA',
MP_NATIVE_ARCH_XTENSA << 2 | MICROPY_PY_BUILTINS_STR_UNICODE,
2, 4, (R_XTENSA_32, R_XTENSA_PLT), asm_jump_xtensa,
),
'xtensawin': ArchData(
'EM_XTENSA',
MP_NATIVE_ARCH_XTENSAWIN << 2 | MICROPY_PY_BUILTINS_STR_UNICODE,
4, 4, (R_XTENSA_32, R_XTENSA_PLT), asm_jump_xtensa,
),
}
################################################################################
# Helper functions
def align_to(value, align):
return (value + align - 1) & ~(align - 1)
def unpack_u24le(data, offset):
return data[offset] | data[offset + 1] << 8 | data[offset + 2] << 16
def pack_u24le(data, offset, value):
data[offset] = value & 0xff
data[offset + 1] = value >> 8 & 0xff
data[offset + 2] = value >> 16 & 0xff
def xxd(text):
for i in range(0, len(text), 16):
print('{:08x}:'.format(i), end='')
for j in range(4):
off = i + j * 4
if off < len(text):
d = int.from_bytes(text[off:off + 4], 'little')
print(' {:08x}'.format(d), end='')
print()
# Smaller numbers are enabled first
LOG_LEVEL_1 = 1
LOG_LEVEL_2 = 2
LOG_LEVEL_3 = 3
log_level = LOG_LEVEL_1
def log(level, msg):
if level <= log_level:
print(msg)
################################################################################
# Qstr extraction
def extract_qstrs(source_files):
def read_qstrs(f):
with open(f) as f:
vals = set()
objs = set()
for line in f:
while line:
m = re.search(r'MP_OBJ_NEW_QSTR\((MP_QSTR_[A-Za-z0-9_]*)\)', line)
if m:
objs.add(m.group(1))
else:
m = re.search(r'MP_QSTR_[A-Za-z0-9_]*', line)
if m:
vals.add(m.group())
if m:
s = m.span()
line = line[:s[0]] + line[s[1]:]
else:
line = ''
return vals, objs
static_qstrs = ['MP_QSTR_' + qstrutil.qstr_escape(q) for q in qstrutil.static_qstr_list]
qstr_vals = set()
qstr_objs = set()
for f in source_files:
vals, objs = read_qstrs(f)
qstr_vals.update(vals)
qstr_objs.update(objs)
qstr_vals.difference_update(static_qstrs)
return static_qstrs, qstr_vals, qstr_objs
################################################################################
# Linker
class LinkError(Exception):
pass
class Section:
def __init__(self, name, data, alignment, filename=None):
self.filename = filename
self.name = name
self.data = data
self.alignment = alignment
self.addr = 0
self.reloc = []
@staticmethod
def from_elfsec(elfsec, filename):
assert elfsec.header.sh_addr == 0
return Section(elfsec.name, elfsec.data(), elfsec.data_alignment, filename)
class GOTEntry:
def __init__(self, name, sym, link_addr=0):
self.name = name
self.sym = sym
self.offset = None
self.link_addr = link_addr
def isexternal(self):
return self.sec_name.startswith('.external')
def istext(self):
return self.sec_name.startswith('.text')
def isrodata(self):
return self.sec_name.startswith(('.rodata', '.data.rel.ro'))
def isbss(self):
return self.sec_name.startswith('.bss')
class LiteralEntry:
def __init__(self, value, offset):
self.value = value
self.offset = offset
class LinkEnv:
def __init__(self, arch):
self.arch = ARCH_DATA[arch]
self.sections = [] # list of sections in order of output
self.literal_sections = [] # list of literal sections (xtensa only)
self.known_syms = {} # dict of symbols that are defined
self.unresolved_syms = [] # list of unresolved symbols
self.mpy_relocs = [] # list of relocations needed in the output .mpy file
def check_arch(self, arch_name):
if arch_name != self.arch.name:
raise LinkError('incompatible arch')
def print_sections(self):
log(LOG_LEVEL_2, 'sections:')
for sec in self.sections:
log(LOG_LEVEL_2, ' {:08x} {} size={}'.format(sec.addr, sec.name, len(sec.data)))
def find_addr(self, name):
if name in self.known_syms:
s = self.known_syms[name]
return s.section.addr + s['st_value']
raise LinkError('unknown symbol: {}'.format(name))
def build_got_generic(env):
env.got_entries = {}
for sec in env.sections:
for r in sec.reloc:
s = r.sym
if not (s.entry['st_info']['bind'] == 'STB_GLOBAL' and r['r_info_type'] in env.arch.arch_got):
continue
s_type = s.entry['st_info']['type']
assert s_type in ('STT_NOTYPE', 'STT_FUNC', 'STT_OBJECT'), s_type
assert s.name
if s.name in env.got_entries:
continue
env.got_entries[s.name] = GOTEntry(s.name, s)
def build_got_xtensa(env):
env.got_entries = {}
env.lit_entries = {}
env.xt_literals = {}
# Extract the values from the literal table
for sec in env.literal_sections:
assert len(sec.data) % env.arch.word_size == 0
# Look through literal relocations to find any global pointers that should be GOT entries
for r in sec.reloc:
s = r.sym
s_type = s.entry['st_info']['type']
assert s_type in ('STT_NOTYPE', 'STT_FUNC', 'STT_OBJECT', 'STT_SECTION'), s_type
assert r['r_info_type'] in env.arch.arch_got
assert r['r_offset'] % env.arch.word_size == 0
# This entry is a global pointer
existing = struct.unpack_from('<I', sec.data, r['r_offset'])[0]
if s_type == 'STT_SECTION':
assert r['r_addend'] == 0
name = "{}+0x{:x}".format(s.section.name, existing)
else:
assert existing == 0
name = s.name
if r['r_addend'] != 0:
name = "{}+0x{:x}".format(name, r['r_addend'])
idx = '{}+0x{:x}'.format(sec.filename, r['r_offset'])
env.xt_literals[idx] = name
if name in env.got_entries:
# Deduplicate GOT entries
continue
env.got_entries[name] = GOTEntry(name, s, existing)
# Go through all literal entries finding those that aren't global pointers so must be actual literals
for i in range(0, len(sec.data), env.arch.word_size):
idx = '{}+0x{:x}'.format(sec.filename, i)
if idx not in env.xt_literals:
# This entry is an actual literal
value = struct.unpack_from('<I', sec.data, i)[0]
env.xt_literals[idx] = value
if value in env.lit_entries:
# Deduplicate literals
continue
env.lit_entries[value] = LiteralEntry(value, len(env.lit_entries) * env.arch.word_size)
def populate_got(env):
# Compute GOT destination addresses
for got_entry in env.got_entries.values():
sym = got_entry.sym
if hasattr(sym, 'resolved'):
sym = sym.resolved
sec = sym.section
addr = sym['st_value']
got_entry.sec_name = sec.name
got_entry.link_addr += sec.addr + addr
# Get sorted GOT, sorted by external, text, rodata, bss so relocations can be combined
got_list = sorted(env.got_entries.values(),
key=lambda g: g.isexternal() + 2 * g.istext() + 3 * g.isrodata() + 4 * g.isbss())
# Layout and populate the GOT
offset = 0
for got_entry in got_list:
got_entry.offset = offset
offset += env.arch.word_size
o = env.got_section.addr + got_entry.offset
env.full_text[o:o + env.arch.word_size] = got_entry.link_addr.to_bytes(env.arch.word_size, 'little')
# Create a relocation for each GOT entry
for got_entry in got_list:
if got_entry.name == 'mp_fun_table':
dest = 'mp_fun_table'
elif got_entry.name.startswith('mp_fun_table+0x'):
dest = int(got_entry.name.split('+')[1], 16) // env.arch.word_size
elif got_entry.sec_name.startswith('.text'):
dest = '.text'
elif got_entry.sec_name.startswith('.rodata'):
dest = '.rodata'
elif got_entry.sec_name.startswith('.data.rel.ro'):
dest = '.data.rel.ro'
elif got_entry.sec_name.startswith('.bss'):
dest = '.bss'
else:
assert 0, (got_entry.name, got_entry.sec_name)
env.mpy_relocs.append(('.text', env.got_section.addr + got_entry.offset, dest))
# Print out the final GOT
log(LOG_LEVEL_2, 'GOT: {:08x}'.format(env.got_section.addr))
for g in got_list:
log(LOG_LEVEL_2, ' {:08x} {} -> {}+{:08x}'.format(g.offset, g.name, g.sec_name, g.link_addr))
def populate_lit(env):
log(LOG_LEVEL_2, 'LIT: {:08x}'.format(env.lit_section.addr))
for lit_entry in env.lit_entries.values():
value = lit_entry.value
log(LOG_LEVEL_2, ' {:08x} = {:08x}'.format(lit_entry.offset, value))
o = env.lit_section.addr + lit_entry.offset
env.full_text[o:o + env.arch.word_size] = value.to_bytes(env.arch.word_size, 'little')
def do_relocation_text(env, text_addr, r):
# Extract relevant info about symbol that's being relocated
s = r.sym
s_bind = s.entry['st_info']['bind']
s_shndx = s.entry['st_shndx']
s_type = s.entry['st_info']['type']
r_offset = r['r_offset'] + text_addr
r_info_type = r['r_info_type']
try:
# only for RELA sections
r_addend = r['r_addend']
except KeyError:
r_addend = 0
# Default relocation type and name for logging
reloc_type = 'le32'
log_name = None
if (env.arch.name == 'EM_386' and r_info_type in (R_386_PC32, R_386_PLT32)
or env.arch.name == 'EM_X86_64' and r_info_type in (R_X86_64_PC32, R_X86_64_PLT32)
or env.arch.name == 'EM_ARM' and r_info_type in (R_ARM_REL32, R_ARM_THM_CALL, R_ARM_THM_JUMP24)
or s_bind == 'STB_LOCAL' and env.arch.name == 'EM_XTENSA' and r_info_type == R_XTENSA_32 # not GOT
):
# Standard relocation to fixed location within text/rodata
if hasattr(s, 'resolved'):
s = s.resolved
sec = s.section
if env.arch.separate_rodata and sec.name.startswith('.rodata'):
raise LinkError('fixed relocation to rodata with rodata referenced via GOT')
if sec.name.startswith('.bss'):
raise LinkError('{}: fixed relocation to bss (bss variables can\'t be static)'.format(s.filename))
if sec.name.startswith('.external'):
raise LinkError('{}: fixed relocation to external symbol: {}'.format(s.filename, s.name))
addr = sec.addr + s['st_value']
reloc = addr - r_offset + r_addend
if r_info_type in (R_ARM_THM_CALL, R_ARM_THM_JUMP24):
# Both relocations have the same bit pattern to rewrite:
# R_ARM_THM_CALL: bl
# R_ARM_THM_JUMP24: b.w
reloc_type = 'thumb_b'
elif (env.arch.name == 'EM_386' and r_info_type == R_386_GOTPC
or env.arch.name == 'EM_ARM' and r_info_type == R_ARM_BASE_PREL
):
# Relocation to GOT address itself
assert s.name == '_GLOBAL_OFFSET_TABLE_'
addr = env.got_section.addr
reloc = addr - r_offset + r_addend
elif (env.arch.name == 'EM_386' and r_info_type in (R_386_GOT32, R_386_GOT32X)
or env.arch.name == 'EM_ARM' and r_info_type == R_ARM_GOT_BREL
):
# Relcation pointing to GOT
reloc = addr = env.got_entries[s.name].offset
elif env.arch.name == 'EM_X86_64' and r_info_type == R_X86_64_REX_GOTPCRELX:
# Relcation pointing to GOT
got_entry = env.got_entries[s.name]
addr = env.got_section.addr + got_entry.offset
reloc = addr - r_offset + r_addend
elif env.arch.name == 'EM_386' and r_info_type == R_386_GOTOFF:
# Relocation relative to GOT
addr = s.section.addr + s['st_value']
reloc = addr - env.got_section.addr + r_addend
elif env.arch.name == 'EM_XTENSA' and r_info_type == R_XTENSA_SLOT0_OP:
# Relocation pointing to GOT, xtensa specific
sec = s.section
if sec.name.startswith('.text'):
# it looks like R_XTENSA_SLOT0_OP into .text is already correctly relocated
return
assert sec.name.startswith('.literal'), sec.name
lit_idx = '{}+0x{:x}'.format(sec.filename, r_addend)
lit_ptr = env.xt_literals[lit_idx]
if isinstance(lit_ptr, str):
addr = env.got_section.addr + env.got_entries[lit_ptr].offset
log_name = 'GOT {}'.format(lit_ptr)
else:
addr = env.lit_section.addr + env.lit_entries[lit_ptr].offset
log_name = 'LIT'
reloc = addr - r_offset
reloc_type = 'xtensa_l32r'
elif env.arch.name == 'EM_XTENSA' and r_info_type == R_XTENSA_DIFF32:
if s.section.name.startswith('.text'):
# it looks like R_XTENSA_DIFF32 into .text is already correctly relocated
return
assert 0
else:
# Unknown/unsupported relocation
assert 0, r_info_type
# Write relocation
if reloc_type == 'le32':
existing, = struct.unpack_from('<I', env.full_text, r_offset)
struct.pack_into('<I', env.full_text, r_offset, (existing + reloc) & 0xffffffff)
elif reloc_type == 'thumb_b':
b_h, b_l = struct.unpack_from('<HH', env.full_text, r_offset)
existing = (b_h & 0x7ff) << 12 | (b_l & 0x7ff) << 1
if existing >= 0x400000: # 2's complement
existing -= 0x800000
new = existing + reloc
b_h = (b_h & 0xf800) | (new >> 12) & 0x7ff
b_l = (b_l & 0xf800) | (new >> 1) & 0x7ff
struct.pack_into('<HH', env.full_text, r_offset, b_h, b_l)
elif reloc_type == 'xtensa_l32r':
l32r = unpack_u24le(env.full_text, r_offset)
assert l32r & 0xf == 1 # RI16 encoded l32r
l32r_imm16 = l32r >> 8
l32r_imm16 = (l32r_imm16 + reloc >> 2) & 0xffff
l32r = l32r & 0xff | l32r_imm16 << 8
pack_u24le(env.full_text, r_offset, l32r)
else:
assert 0, reloc_type
# Log information about relocation
if log_name is None:
if s_type == 'STT_SECTION':
log_name = s.section.name
else:
log_name = s.name
log(LOG_LEVEL_3, ' {:08x} {} -> {:08x}'.format(r_offset, log_name, addr))
def do_relocation_data(env, text_addr, r):
s = r.sym
s_type = s.entry['st_info']['type']
r_offset = r['r_offset'] + text_addr
r_info_type = r['r_info_type']
try:
# only for RELA sections
r_addend = r['r_addend']
except KeyError:
r_addend = 0
if (env.arch.name == 'EM_386' and r_info_type == R_386_32
or env.arch.name == 'EM_X86_64' and r_info_type == R_X86_64_64
or env.arch.name == 'EM_ARM' and r_info_type == R_ARM_ABS32
or env.arch.name == 'EM_XTENSA' and r_info_type == R_XTENSA_32):
# Relocation in data.rel.ro to internal/external symbol
if env.arch.word_size == 4:
struct_type = '<I'
elif env.arch.word_size == 8:
struct_type = '<Q'
sec = s.section
assert r_offset % env.arch.word_size == 0
addr = sec.addr + s['st_value'] + r_addend
if s_type == 'STT_SECTION':
log_name = sec.name
else:
log_name = s.name
log(LOG_LEVEL_3, ' {:08x} -> {} {:08x}'.format(r_offset, log_name, addr))
if env.arch.separate_rodata:
data = env.full_rodata
else:
data = env.full_text
existing, = struct.unpack_from(struct_type, data, r_offset)
if sec.name.startswith(('.text', '.rodata', '.data.rel.ro', '.bss')):
struct.pack_into(struct_type, data, r_offset, existing + addr)
kind = sec.name
elif sec.name == '.external.mp_fun_table':
assert addr == 0
kind = s.mp_fun_table_offset
else:
assert 0, sec.name
if env.arch.separate_rodata:
base = '.rodata'
else:
base = '.text'
env.mpy_relocs.append((base, r_offset, kind))
else:
# Unknown/unsupported relocation
assert 0, r_info_type
def load_object_file(env, felf):
with open(felf, 'rb') as f:
elf = elffile.ELFFile(f)
env.check_arch(elf['e_machine'])
# Get symbol table
symtab = list(elf.get_section_by_name('.symtab').iter_symbols())
# Load needed sections from ELF file
sections_shndx = {} # maps elf shndx to Section object
for idx, s in enumerate(elf.iter_sections()):
if s.header.sh_type in ('SHT_PROGBITS', 'SHT_NOBITS'):
if s.data_size == 0:
# Ignore empty sections
pass
elif s.name.startswith(('.literal', '.text', '.rodata', '.data.rel.ro', '.bss')):
sec = Section.from_elfsec(s, felf)
sections_shndx[idx] = sec
if s.name.startswith('.literal'):
env.literal_sections.append(sec)
else:
env.sections.append(sec)
elif s.name.startswith('.data'):
raise LinkError('{}: {} non-empty'.format(felf, s.name))
else:
# Ignore section
pass
elif s.header.sh_type in ('SHT_REL', 'SHT_RELA'):
shndx = s.header.sh_info
if shndx in sections_shndx:
sec = sections_shndx[shndx]
sec.reloc_name = s.name
sec.reloc = list(s.iter_relocations())
for r in sec.reloc:
r.sym = symtab[r['r_info_sym']]
# Link symbols to their sections, and update known and unresolved symbols
for sym in symtab:
sym.filename = felf
shndx = sym.entry['st_shndx']
if shndx in sections_shndx:
# Symbol with associated section
sym.section = sections_shndx[shndx]
if sym['st_info']['bind'] == 'STB_GLOBAL':
# Defined global symbol
if sym.name in env.known_syms and not sym.name.startswith('__x86.get_pc_thunk.'):
raise LinkError('duplicate symbol: {}'.format(sym.name))
env.known_syms[sym.name] = sym
elif sym.entry['st_shndx'] == 'SHN_UNDEF' and sym['st_info']['bind'] == 'STB_GLOBAL':
# Undefined global symbol, needs resolving
env.unresolved_syms.append(sym)
def link_objects(env, native_qstr_vals_len, native_qstr_objs_len):
# Build GOT information
if env.arch.name == 'EM_XTENSA':
build_got_xtensa(env)
else:
build_got_generic(env)
# Creat GOT section
got_size = len(env.got_entries) * env.arch.word_size
env.got_section = Section('GOT', bytearray(got_size), env.arch.word_size)
if env.arch.name == 'EM_XTENSA':
env.sections.insert(0, env.got_section)
else:
env.sections.append(env.got_section)
# Create optional literal section
if env.arch.name == 'EM_XTENSA':
lit_size = len(env.lit_entries) * env.arch.word_size
env.lit_section = Section('LIT', bytearray(lit_size), env.arch.word_size)
env.sections.insert(1, env.lit_section)
# Create section to contain mp_native_qstr_val_table
env.qstr_val_section = Section('.text.QSTR_VAL', bytearray(native_qstr_vals_len * env.arch.qstr_entry_size), env.arch.qstr_entry_size)
env.sections.append(env.qstr_val_section)
# Create section to contain mp_native_qstr_obj_table
env.qstr_obj_section = Section('.text.QSTR_OBJ', bytearray(native_qstr_objs_len * env.arch.word_size), env.arch.word_size)
env.sections.append(env.qstr_obj_section)
# Resolve unknown symbols
mp_fun_table_sec = Section('.external.mp_fun_table', b'', 0)
fun_table = {key: 67 + idx
for idx, key in enumerate([
'mp_type_type',
'mp_type_str',
'mp_type_list',
'mp_type_dict',
'mp_type_fun_builtin_0',
'mp_type_fun_builtin_1',
'mp_type_fun_builtin_2',
'mp_type_fun_builtin_3',
'mp_type_fun_builtin_var',
'mp_stream_read_obj',
'mp_stream_readinto_obj',
'mp_stream_unbuffered_readline_obj',
'mp_stream_write_obj',
])
}
for sym in env.unresolved_syms:
assert sym['st_value'] == 0
if sym.name == '_GLOBAL_OFFSET_TABLE_':
pass
elif sym.name == 'mp_fun_table':
sym.section = Section('.external', b'', 0)
elif sym.name == 'mp_native_qstr_val_table':
sym.section = env.qstr_val_section
elif sym.name == 'mp_native_qstr_obj_table':
sym.section = env.qstr_obj_section
elif sym.name in env.known_syms:
sym.resolved = env.known_syms[sym.name]
else:
if sym.name in fun_table:
sym.section = mp_fun_table_sec
sym.mp_fun_table_offset = fun_table[sym.name]
else:
raise LinkError('{}: undefined symbol: {}'.format(sym.filename, sym.name))
# Align sections, assign their addresses, and create full_text
env.full_text = bytearray(env.arch.asm_jump(8)) # dummy, to be filled in later
env.full_rodata = bytearray(0)
env.full_bss = bytearray(0)
for sec in env.sections:
if env.arch.separate_rodata and sec.name.startswith(('.rodata', '.data.rel.ro')):
data = env.full_rodata
elif sec.name.startswith('.bss'):
data = env.full_bss
else:
data = env.full_text
sec.addr = align_to(len(data), sec.alignment)
data.extend(b'\x00' * (sec.addr - len(data)))
data.extend(sec.data)
env.print_sections()
populate_got(env)
if env.arch.name == 'EM_XTENSA':
populate_lit(env)
# Fill in relocations
for sec in env.sections:
if not sec.reloc:
continue
log(LOG_LEVEL_3, '{}: {} relocations via {}:'.format(sec.filename, sec.name, sec.reloc_name))
for r in sec.reloc:
if sec.name.startswith(('.text', '.rodata')):
do_relocation_text(env, sec.addr, r)
elif sec.name.startswith('.data.rel.ro'):
do_relocation_data(env, sec.addr, r)
else:
assert 0, sec.name
################################################################################
# .mpy output
class MPYOutput:
def open(self, fname):
self.f = open(fname, 'wb')
self.prev_base = -1
self.prev_offset = -1
def close(self):
self.f.close()
def write_bytes(self, buf):
self.f.write(buf)
def write_uint(self, val):
b = bytearray()
b.insert(0, val & 0x7f)
val >>= 7
while val:
b.insert(0, 0x80 | (val & 0x7f))
val >>= 7
self.write_bytes(b)
def write_qstr(self, s):
if s in qstrutil.static_qstr_list:
self.write_bytes(bytes([0, qstrutil.static_qstr_list.index(s) + 1]))
else:
s = bytes(s, 'ascii')
self.write_uint(len(s) << 1)
self.write_bytes(s)
def write_obj(self, o):
if o is Ellipsis:
self.write_bytes(b'e')
return
else:
# Other Python types not implemented
assert 0
def write_reloc(self, base, offset, dest, n):
need_offset = not (base == self.prev_base and offset == self.prev_offset + 1)
self.prev_offset = offset + n - 1
if dest <= 2:
dest = (dest << 1) | (n > 1)
else:
assert 6 <= dest <= 127
assert n == 1
dest = dest << 1 | need_offset
assert 0 <= dest <= 0xfe, dest
self.write_bytes(bytes([dest]))
if need_offset:
if base == '.text':
base = 0
elif base == '.rodata':
base = 1
self.write_uint(offset << 1 | base)
if n > 1:
self.write_uint(n)
def build_mpy(env, entry_offset, fmpy, native_qstr_vals, native_qstr_objs):
# Write jump instruction to start of text
jump = env.arch.asm_jump(entry_offset)
env.full_text[:len(jump)] = jump
log(LOG_LEVEL_1, 'arch: {}'.format(env.arch.name))
log(LOG_LEVEL_1, 'text size: {}'.format(len(env.full_text)))
if len(env.full_rodata):
log(LOG_LEVEL_1, 'rodata size: {}'.format(len(env.full_rodata)))
log(LOG_LEVEL_1, 'bss size: {}'.format(len(env.full_bss)))
log(LOG_LEVEL_1, 'GOT entries: {}'.format(len(env.got_entries)))
#xxd(env.full_text)
out = MPYOutput()
out.open(fmpy)
# MPY: header
out.write_bytes(bytearray([
ord('M'),
MPY_VERSION,
env.arch.mpy_feature,
MP_SMALL_INT_BITS,
QSTR_WINDOW_SIZE,
]))
# MPY: kind/len
out.write_uint(len(env.full_text) << 2 | (MP_CODE_NATIVE_VIPER - MP_CODE_BYTECODE))
# MPY: machine code
out.write_bytes(env.full_text)
# MPY: n_qstr_link (assumes little endian)
out.write_uint(len(native_qstr_vals) + len(native_qstr_objs))
for q in range(len(native_qstr_vals)):
off = env.qstr_val_section.addr + q * env.arch.qstr_entry_size
out.write_uint(off << 2)
out.write_qstr(native_qstr_vals[q])
for q in range(len(native_qstr_objs)):
off = env.qstr_obj_section.addr + q * env.arch.word_size
out.write_uint(off << 2 | 3)
out.write_qstr(native_qstr_objs[q])
# MPY: scope_flags
scope_flags = MP_SCOPE_FLAG_VIPERRELOC
if len(env.full_rodata):
scope_flags |= MP_SCOPE_FLAG_VIPERRODATA
if len(env.full_bss):
scope_flags |= MP_SCOPE_FLAG_VIPERBSS
out.write_uint(scope_flags)
# MPY: n_obj
out.write_uint(bool(len(env.full_rodata)) + bool(len(env.full_bss)))
# MPY: n_raw_code
out.write_uint(0)
# MPY: optional bytes object with rodata
if len(env.full_rodata):
out.write_obj(Ellipsis)
if len(env.full_bss):
out.write_obj(Ellipsis)
# MPY: rodata and/or bss
if len(env.full_rodata):
rodata_const_table_idx = 1
out.write_uint(len(env.full_rodata))
out.write_bytes(env.full_rodata)
if len(env.full_bss):
bss_const_table_idx = bool(env.full_rodata) + 1
out.write_uint(len(env.full_bss))
# MPY: relocation information
prev_kind = None
for base, addr, kind in env.mpy_relocs:
if isinstance(kind, str) and kind.startswith('.text'):
kind = 0
elif kind in ('.rodata', '.data.rel.ro'):
if env.arch.separate_rodata:
kind = rodata_const_table_idx
else:
kind = 0
elif isinstance(kind, str) and kind.startswith('.bss'):
kind = bss_const_table_idx
elif kind == 'mp_fun_table':
kind = 6
else:
kind = 7 + kind
assert addr % env.arch.word_size == 0, addr
offset = addr // env.arch.word_size
if kind == prev_kind and base == prev_base and offset == prev_offset + 1:
prev_n += 1
prev_offset += 1
else:
if prev_kind is not None:
out.write_reloc(prev_base, prev_offset - prev_n + 1, prev_kind, prev_n)
prev_kind = kind
prev_base = base
prev_offset = offset
prev_n = 1
if prev_kind is not None:
out.write_reloc(prev_base, prev_offset - prev_n + 1, prev_kind, prev_n)
# MPY: sentinel for end of relocations
out.write_bytes(b'\xff')
out.close()
################################################################################
# main
def do_preprocess(args):
if args.output is None:
assert args.files[0].endswith('.c')
args.output = args.files[0][:-1] + 'config.h'
static_qstrs, qstr_vals, qstr_objs = extract_qstrs(args.files)
with open(args.output, 'w') as f:
print('#include <stdint.h>\n'
'typedef uintptr_t mp_uint_t;\n'
'typedef intptr_t mp_int_t;\n'
'typedef uintptr_t mp_off_t;', file=f)
for i, q in enumerate(static_qstrs):
print('#define %s (%u)' % (q, i + 1), file=f)
for i, q in enumerate(sorted(qstr_vals)):
print('#define %s (mp_native_qstr_val_table[%d])' % (q, i), file=f)
for i, q in enumerate(sorted(qstr_objs)):
print('#define MP_OBJ_NEW_QSTR_%s ((mp_obj_t)mp_native_qstr_obj_table[%d])' % (q, i), file=f)
if args.arch == 'xtensawin':
qstr_type = 'uint32_t' # esp32 can only read 32-bit values from IRAM
else:
qstr_type = 'uint16_t'
print('extern const {} mp_native_qstr_val_table[];'.format(qstr_type), file=f)
print('extern const mp_uint_t mp_native_qstr_obj_table[];', file=f)
def do_link(args):
if args.output is None:
assert args.files[0].endswith('.o')
args.output = args.files[0][:-1] + 'mpy'
native_qstr_vals = []
native_qstr_objs = []
if args.qstrs is not None:
with open(args.qstrs) as f:
for l in f:
m = re.match(r'#define MP_QSTR_([A-Za-z0-9_]*) \(mp_native_', l)
if m:
native_qstr_vals.append(m.group(1))
else:
m = re.match(r'#define MP_OBJ_NEW_QSTR_MP_QSTR_([A-Za-z0-9_]*)', l)
if m:
native_qstr_objs.append(m.group(1))
log(LOG_LEVEL_2, 'qstr vals: ' + ', '.join(native_qstr_vals))
log(LOG_LEVEL_2, 'qstr objs: ' + ', '.join(native_qstr_objs))
env = LinkEnv(args.arch)
try:
for file in args.files:
load_object_file(env, file)
link_objects(env, len(native_qstr_vals), len(native_qstr_objs))
build_mpy(env, env.find_addr('mpy_init'), args.output, native_qstr_vals, native_qstr_objs)
except LinkError as er:
print('LinkError:', er.args[0])
sys.exit(1)
def main():
import argparse
cmd_parser = argparse.ArgumentParser(description='Run scripts on the pyboard.')
cmd_parser.add_argument('--verbose', '-v', action='count', default=1, help='increase verbosity')
cmd_parser.add_argument('--arch', default='x64', help='architecture')
cmd_parser.add_argument('--preprocess', action='store_true', help='preprocess source files')
cmd_parser.add_argument('--qstrs', default=None, help='file defining additional qstrs')
cmd_parser.add_argument('--output', '-o', default=None, help='output .mpy file (default to input with .o->.mpy)')
cmd_parser.add_argument('files', nargs='+', help='input files')
args = cmd_parser.parse_args()
global log_level
log_level = args.verbose
if args.preprocess:
do_preprocess(args)
else:
do_link(args)
if __name__ == '__main__':
main()