869 lines
33 KiB
Python
869 lines
33 KiB
Python
#!/usr/bin/env python3
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import argparse
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import tempfile
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import struct
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import copy
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import sys
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import re
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import os
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MAX_FN_SIZE = 100
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EI_NIDENT = 16
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EI_CLASS = 4
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EI_DATA = 5
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EI_VERSION = 6
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EI_OSABI = 7
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EI_ABIVERSION = 8
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STN_UNDEF = 0
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SHN_UNDEF = 0
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SHN_ABS = 0xfff1
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SHN_COMMON = 0xfff2
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SHN_XINDEX = 0xffff
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SHN_LORESERVE = 0xff00
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STT_NOTYPE = 0
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STT_OBJECT = 1
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STT_FUNC = 2
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STT_SECTION = 3
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STT_FILE = 4
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STT_COMMON = 5
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STT_TLS = 6
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STB_LOCAL = 0
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STB_GLOBAL = 1
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STB_WEAK = 2
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STV_DEFAULT = 0
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STV_INTERNAL = 1
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STV_HIDDEN = 2
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STV_PROTECTED = 3
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SHT_NULL = 0
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SHT_PROGBITS = 1
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SHT_SYMTAB = 2
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SHT_STRTAB = 3
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SHT_RELA = 4
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SHT_HASH = 5
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SHT_DYNAMIC = 6
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SHT_NOTE = 7
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SHT_NOBITS = 8
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SHT_REL = 9
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SHT_SHLIB = 10
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SHT_DYNSYM = 11
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SHT_INIT_ARRAY = 14
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SHT_FINI_ARRAY = 15
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SHT_PREINIT_ARRAY = 16
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SHT_GROUP = 17
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SHT_SYMTAB_SHNDX = 18
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SHT_MIPS_GPTAB = 0x70000003
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SHT_MIPS_DEBUG = 0x70000005
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SHT_MIPS_REGINFO = 0x70000006
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SHT_MIPS_OPTIONS = 0x7000000d
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SHF_WRITE = 0x1
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SHF_ALLOC = 0x2
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SHF_EXECINSTR = 0x4
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SHF_MERGE = 0x10
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SHF_STRINGS = 0x20
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SHF_INFO_LINK = 0x40
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SHF_LINK_ORDER = 0x80
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SHF_OS_NONCONFORMING = 0x100
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SHF_GROUP = 0x200
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SHF_TLS = 0x400
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R_MIPS_32 = 2
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R_MIPS_26 = 4
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R_MIPS_HI16 = 5
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R_MIPS_LO16 = 6
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class ElfHeader:
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"""
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typedef struct {
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unsigned char e_ident[EI_NIDENT];
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Elf32_Half e_type;
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Elf32_Half e_machine;
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Elf32_Word e_version;
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Elf32_Addr e_entry;
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Elf32_Off e_phoff;
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Elf32_Off e_shoff;
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Elf32_Word e_flags;
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Elf32_Half e_ehsize;
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Elf32_Half e_phentsize;
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Elf32_Half e_phnum;
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Elf32_Half e_shentsize;
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Elf32_Half e_shnum;
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Elf32_Half e_shstrndx;
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} Elf32_Ehdr;
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"""
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def __init__(self, data):
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self.e_ident = data[:EI_NIDENT]
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self.e_type, self.e_machine, self.e_version, self.e_entry, self.e_phoff, self.e_shoff, self.e_flags, self.e_ehsize, self.e_phentsize, self.e_phnum, self.e_shentsize, self.e_shnum, self.e_shstrndx = struct.unpack('>HHIIIIIHHHHHH', data[EI_NIDENT:])
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assert self.e_ident[EI_CLASS] == 1 # 32-bit
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assert self.e_ident[EI_DATA] == 2 # big-endian
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assert self.e_type == 1 # relocatable
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assert self.e_machine == 8 # MIPS I Architecture
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assert self.e_phoff == 0 # no program header
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assert self.e_shoff != 0 # section header
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assert self.e_shstrndx != SHN_UNDEF
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def to_bin(self):
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return self.e_ident + struct.pack('>HHIIIIIHHHHHH', self.e_type,
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self.e_machine, self.e_version, self.e_entry, self.e_phoff,
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self.e_shoff, self.e_flags, self.e_ehsize, self.e_phentsize,
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self.e_phnum, self.e_shentsize, self.e_shnum, self.e_shstrndx)
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class Symbol:
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"""
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typedef struct {
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Elf32_Word st_name;
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Elf32_Addr st_value;
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Elf32_Word st_size;
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unsigned char st_info;
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unsigned char st_other;
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Elf32_Half st_shndx;
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} Elf32_Sym;
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"""
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def __init__(self, data, strtab):
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self.st_name, self.st_value, self.st_size, st_info, self.st_other, self.st_shndx = struct.unpack('>IIIBBH', data)
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assert self.st_shndx != SHN_XINDEX, "too many sections (SHN_XINDEX not supported)"
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self.bind = st_info >> 4
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self.type = st_info & 15
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self.name = strtab.lookup_str(self.st_name)
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self.visibility = self.st_other & 3
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def to_bin(self):
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st_info = (self.bind << 4) | self.type
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return struct.pack('>IIIBBH', self.st_name, self.st_value, self.st_size, st_info, self.st_other, self.st_shndx)
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class Relocation:
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def __init__(self, data, sh_type):
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self.sh_type = sh_type
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if sh_type == SHT_REL:
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self.r_offset, self.r_info = struct.unpack('>II', data)
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else:
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self.r_offset, self.r_info, self.r_addend = struct.unpack('>III', data)
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self.sym_index = self.r_info >> 8
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self.rel_type = self.r_info & 0xff
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def to_bin(self):
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self.r_info = (self.sym_index << 8) | self.rel_type
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if self.sh_type == SHT_REL:
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return struct.pack('>II', self.r_offset, self.r_info)
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else:
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return struct.pack('>III', self.r_offset, self.r_info, self.r_addend)
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class Section:
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"""
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typedef struct {
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Elf32_Word sh_name;
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Elf32_Word sh_type;
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Elf32_Word sh_flags;
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Elf32_Addr sh_addr;
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Elf32_Off sh_offset;
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Elf32_Word sh_size;
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Elf32_Word sh_link;
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Elf32_Word sh_info;
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Elf32_Word sh_addralign;
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Elf32_Word sh_entsize;
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} Elf32_Shdr;
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"""
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def __init__(self, header, data, index):
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self.sh_name, self.sh_type, self.sh_flags, self.sh_addr, self.sh_offset, self.sh_size, self.sh_link, self.sh_info, self.sh_addralign, self.sh_entsize = struct.unpack('>IIIIIIIIII', header)
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assert not self.sh_flags & SHF_LINK_ORDER
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if self.sh_entsize != 0:
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assert self.sh_size % self.sh_entsize == 0
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if self.sh_type == SHT_NOBITS:
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self.data = ''
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else:
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self.data = data[self.sh_offset:self.sh_offset + self.sh_size]
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self.index = index
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self.relocated_by = []
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@staticmethod
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def from_parts(sh_name, sh_type, sh_flags, sh_link, sh_info, sh_addralign, sh_entsize, data, index):
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header = struct.pack('>IIIIIIIIII', sh_name, sh_type, sh_flags, 0, 0, len(data), sh_link, sh_info, sh_addralign, sh_entsize)
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return Section(header, data, index)
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def lookup_str(self, index):
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assert self.sh_type == SHT_STRTAB
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to = self.data.find(b'\0', index)
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assert to != -1
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return self.data[index:to].decode('utf-8')
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def add_str(self, string):
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assert self.sh_type == SHT_STRTAB
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ret = len(self.data)
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self.data += bytes(string, 'utf-8') + b'\0'
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return ret
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def is_rel(self):
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return self.sh_type == SHT_REL or self.sh_type == SHT_RELA
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def header_to_bin(self):
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if self.sh_type != SHT_NOBITS:
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self.sh_size = len(self.data)
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return struct.pack('>IIIIIIIIII', self.sh_name, self.sh_type, self.sh_flags, self.sh_addr, self.sh_offset, self.sh_size, self.sh_link, self.sh_info, self.sh_addralign, self.sh_entsize)
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def late_init(self, sections):
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if self.sh_type == SHT_SYMTAB:
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self.init_symbols(sections)
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elif self.is_rel():
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self.rel_target = sections[self.sh_info]
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self.rel_target.relocated_by.append(self)
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self.init_relocs()
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def find_symbol(self, name):
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assert self.sh_type == SHT_SYMTAB
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for s in self.symbol_entries:
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if s.name == name:
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return (s.st_shndx, s.st_value)
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return None
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def init_symbols(self, sections):
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assert self.sh_type == SHT_SYMTAB
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assert self.sh_entsize == 16
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self.strtab = sections[self.sh_link]
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entries = []
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for i in range(0, self.sh_size, self.sh_entsize):
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entries.append(Symbol(self.data[i:i+self.sh_entsize], self.strtab))
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self.symbol_entries = entries
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def init_relocs(self):
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assert self.is_rel()
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entries = []
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for i in range(0, self.sh_size, self.sh_entsize):
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entries.append(Relocation(self.data[i:i+self.sh_entsize], self.sh_type))
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self.relocations = entries
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def local_symbols(self):
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assert self.sh_type == SHT_SYMTAB
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return self.symbol_entries[:self.sh_info]
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def global_symbols(self):
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assert self.sh_type == SHT_SYMTAB
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return self.symbol_entries[self.sh_info:]
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class ElfFile:
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def __init__(self, data):
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self.data = data
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assert data[:4] == b'\x7fELF', "not an ELF file"
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self.elf_header = ElfHeader(data[0:52])
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offset, size = self.elf_header.e_shoff, self.elf_header.e_shentsize
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null_section = Section(data[offset:offset + size], data, 0)
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num_sections = self.elf_header.e_shnum or null_section.sh_size
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self.sections = [null_section]
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for i in range(1, num_sections):
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ind = offset + i * size
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self.sections.append(Section(data[ind:ind + size], data, i))
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symtab = None
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for s in self.sections:
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if s.sh_type == SHT_SYMTAB:
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assert not symtab
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symtab = s
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assert symtab is not None
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self.symtab = symtab
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shstr = self.sections[self.elf_header.e_shstrndx]
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for s in self.sections:
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s.name = shstr.lookup_str(s.sh_name)
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s.late_init(self.sections)
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def find_section(self, name):
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for s in self.sections:
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if s.name == name:
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return s
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return None
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def add_section(self, name, sh_type, sh_flags, sh_link, sh_info, sh_addralign, sh_entsize, data):
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shstr = self.sections[self.elf_header.e_shstrndx]
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sh_name = shstr.add_str(name)
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s = Section.from_parts(sh_name=sh_name, sh_type=sh_type,
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sh_flags=sh_flags, sh_link=sh_link, sh_info=sh_info,
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sh_addralign=sh_addralign, sh_entsize=sh_entsize, data=data,
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index=len(self.sections))
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self.sections.append(s)
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s.name = name
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s.late_init(self.sections)
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return s
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def drop_irrelevant_sections(self):
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# We can only drop sections at the end, since otherwise section
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# references might be wrong. Luckily, these sections typically are.
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while self.sections[-1].sh_type in [SHT_MIPS_DEBUG, SHT_MIPS_GPTAB]:
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self.sections.pop()
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def write(self, filename):
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outfile = open(filename, 'wb')
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outidx = 0
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def write_out(data):
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nonlocal outidx
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outfile.write(data)
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outidx += len(data)
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def pad_out(align):
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if align and outidx % align:
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write_out(b'\0' * (align - outidx % align))
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self.elf_header.e_shnum = len(self.sections)
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write_out(self.elf_header.to_bin())
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for s in self.sections:
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if s.sh_type != SHT_NOBITS and s.sh_type != SHT_NULL:
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pad_out(s.sh_addralign)
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s.sh_offset = outidx
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write_out(s.data)
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pad_out(4)
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self.elf_header.e_shoff = outidx
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for s in self.sections:
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write_out(s.header_to_bin())
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outfile.seek(0)
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outfile.write(self.elf_header.to_bin())
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outfile.close()
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def is_temp_name(name):
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return name.startswith('_asmpp_')
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class GlobalState:
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def __init__(self, min_instr_count, skip_instr_count):
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# A value that hopefully never appears as a 32-bit rodata constant (or we
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# miscompile late rodata). Increases by 1 in each step.
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self.late_rodata_hex = 0xE0123456
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self.namectr = 0
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self.min_instr_count = min_instr_count
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self.skip_instr_count = skip_instr_count
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def make_name(self, cat):
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self.namectr += 1
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return '_asmpp_{}{}'.format(cat, self.namectr)
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class GlobalAsmBlock:
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def __init__(self):
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self.cur_section = '.text'
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self.asm_conts = []
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self.late_rodata_asm_conts = []
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self.late_rodata_alignment = 0
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self.text_glabels = []
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self.fn_section_sizes = {
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'.text': 0,
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'.data': 0,
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'.bss': 0,
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'.rodata': 0,
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'.late_rodata': 0,
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}
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self.fn_ins_inds = []
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self.num_lines = 0
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def add_sized(self, size, line):
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if self.cur_section in ['.text', '.late_rodata']:
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assert size % 4 == 0, "size must be a multiple of 4 on line: " + line
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assert size >= 0
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self.fn_section_sizes[self.cur_section] += size
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if self.cur_section == '.text':
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assert self.text_glabels, ".text block without an initial glabel"
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self.fn_ins_inds.append((self.num_lines, size // 4))
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def process_line(self, line):
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line = re.sub(r'/\*.*?\*/', '', line)
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line = re.sub(r'#.*', '', line)
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line = line.strip()
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changed_section = False
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if line.startswith('glabel ') and self.cur_section == '.text':
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self.text_glabels.append(line.split()[1])
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if not line:
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pass # empty line
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elif line.startswith('glabel ') or (' ' not in line and line.endswith(':')):
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pass # label
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elif line.startswith('.section') or line in ['.text', '.data', '.rdata', '.rodata', '.bss', '.late_rodata']:
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# section change
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self.cur_section = '.rodata' if line == '.rdata' else line.split(',')[0].split()[-1]
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assert self.cur_section in ['.data', '.text', '.rodata', '.late_rodata', '.bss'], \
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"unrecognized .section directive"
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changed_section = True
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elif line.startswith('.late_rodata_alignment'):
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assert self.cur_section == '.late_rodata'
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self.late_rodata_alignment = int(line.split()[1])
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assert self.late_rodata_alignment in [4, 8]
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changed_section = True
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elif line.startswith('.incbin'):
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self.add_sized(int(line.split(',')[-1].strip(), 0), line)
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elif line.startswith('.word') or line.startswith('.float'):
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self.add_sized(4 * len(line.split(',')), line)
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elif line.startswith('.double'):
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self.add_sized(8 * len(line.split(',')), line)
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elif line.startswith('.space'):
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self.add_sized(int(line.split()[1], 0), line)
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elif line.startswith('.'):
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# .macro, .ascii, .asciiz, .balign, .align, ...
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assert False, 'not supported yet: ' + line
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else:
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# Unfortunately, macros are hard to support for .rodata --
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# we don't know how how space they will expand to before
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# running the assembler, but we need that information to
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# construct the C code. So if we need that we'll either
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# need to run the assembler twice (at least in some rare
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# cases), or change how this program is invoked.
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# Similarly, we can't currently deal with pseudo-instructions
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# that expand to several real instructions.
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assert self.cur_section == '.text', "instruction or macro call in non-.text section? not supported: " + line
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self.add_sized(4, line)
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if self.cur_section == '.late_rodata':
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if not changed_section:
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self.late_rodata_asm_conts.append(line)
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else:
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self.asm_conts.append(line)
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self.num_lines += 1
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def finish(self, state):
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src = [''] * (self.num_lines + 1)
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late_rodata = []
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late_rodata_fn_output = []
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|
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if self.fn_section_sizes['.late_rodata'] > 0:
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# Generate late rodata by emitting unique float constants.
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# This requires 3 instructions for each 4 bytes of rodata.
|
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# If we know alignment, we can use doubles, which give 3
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# instructions for 8 bytes of rodata.
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size = self.fn_section_sizes['.late_rodata'] // 4
|
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skip_next = False
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for i in range(size):
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if skip_next:
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skip_next = False
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continue
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if (state.late_rodata_hex & 0xffff) == 0:
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# Avoid lui
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state.late_rodata_hex += 1
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dummy_bytes = struct.pack('>I', state.late_rodata_hex)
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state.late_rodata_hex += 1
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late_rodata.append(dummy_bytes)
|
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if self.late_rodata_alignment == 4 * ((i + 1) % 2 + 1) and i + 1 < size:
|
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late_rodata.append(dummy_bytes)
|
|
fval, = struct.unpack('>d', dummy_bytes * 2)
|
|
late_rodata_fn_output.append('*(volatile double*)0 = {};'.format(fval))
|
|
skip_next = True
|
|
else:
|
|
fval, = struct.unpack('>f', dummy_bytes)
|
|
late_rodata_fn_output.append('*(volatile float*)0 = {}f;'.format(fval))
|
|
late_rodata_fn_output.append('')
|
|
late_rodata_fn_output.append('')
|
|
|
|
text_name = None
|
|
if self.fn_section_sizes['.text'] > 0 or late_rodata_fn_output:
|
|
text_name = state.make_name('func')
|
|
src[0] = 'void {}(void) {{'.format(text_name)
|
|
src[self.num_lines] = '}'
|
|
instr_count = self.fn_section_sizes['.text'] // 4
|
|
assert instr_count >= state.min_instr_count, "too short .text block"
|
|
tot_emitted = 0
|
|
tot_skipped = 0
|
|
fn_emitted = 0
|
|
fn_skipped = 0
|
|
rodata_stack = late_rodata_fn_output[::-1]
|
|
for (line, count) in self.fn_ins_inds:
|
|
for _ in range(count):
|
|
if (fn_emitted > MAX_FN_SIZE and instr_count - tot_emitted > state.min_instr_count and
|
|
(not rodata_stack or rodata_stack[-1])):
|
|
# Don't let functions become too large. When a function reaches 284
|
|
# instructions, and -O2 -framepointer flags are passed, the IRIX
|
|
# compiler decides it is a great idea to start optimizing more.
|
|
fn_emitted = 0
|
|
fn_skipped = 0
|
|
src[line] += ' }} void {}(void) {{ '.format(state.make_name('large_func'))
|
|
if fn_skipped < state.skip_instr_count:
|
|
fn_skipped += 1
|
|
tot_skipped += 1
|
|
elif rodata_stack:
|
|
src[line] += rodata_stack.pop()
|
|
else:
|
|
src[line] += '*(volatile int*)0 = 0;'
|
|
tot_emitted += 1
|
|
fn_emitted += 1
|
|
if rodata_stack:
|
|
size = len(late_rodata_fn_output) // 3
|
|
available = instr_count - tot_skipped
|
|
print("late rodata to text ratio is too high: {} / {} must be <= 1/3"
|
|
.format(size, available), file=sys.stderr)
|
|
print("add a .late_rodata_alignment (4|8) to the .late_rodata "
|
|
"block to double the allowed ratio.", file=sys.stderr)
|
|
exit(1)
|
|
|
|
rodata_name = None
|
|
if self.fn_section_sizes['.rodata'] > 0:
|
|
rodata_name = state.make_name('rodata')
|
|
output_line += ' const char {}[{}] = {{1}};'.format(rodata_name, self.fn_section_sizes['.rodata'])
|
|
|
|
data_name = None
|
|
if self.fn_section_sizes['.data'] > 0:
|
|
data_name = state.make_name('data')
|
|
output_line += ' char {}[{}] = {{1}};'.format(data_name, self.fn_section_sizes['.data'])
|
|
|
|
bss_name = None
|
|
if self.fn_section_sizes['.bss'] > 0:
|
|
bss_name = state.make_name('bss')
|
|
output_line += ' char {}[{}];'.format(bss_name, self.fn_section_sizes['.bss'])
|
|
|
|
fn = (self.text_glabels, self.asm_conts, late_rodata, self.late_rodata_asm_conts,
|
|
{
|
|
'.text': (text_name, self.fn_section_sizes['.text']),
|
|
'.data': (data_name, self.fn_section_sizes['.data']),
|
|
'.rodata': (rodata_name, self.fn_section_sizes['.rodata']),
|
|
'.bss': (bss_name, self.fn_section_sizes['.bss']),
|
|
})
|
|
return src, fn
|
|
|
|
def parse_source(f, print_source, opt, framepointer):
|
|
if opt == 'O2':
|
|
if framepointer:
|
|
min_instr_count = 6
|
|
skip_instr_count = 5
|
|
else:
|
|
min_instr_count = 2
|
|
skip_instr_count = 1
|
|
elif opt == 'g':
|
|
if framepointer:
|
|
min_instr_count = 7
|
|
skip_instr_count = 7
|
|
else:
|
|
min_instr_count = 4
|
|
skip_instr_count = 4
|
|
else:
|
|
assert opt == 'g3'
|
|
if framepointer:
|
|
min_instr_count = 4
|
|
skip_instr_count = 4
|
|
else:
|
|
min_instr_count = 2
|
|
skip_instr_count = 2
|
|
|
|
state = GlobalState(min_instr_count, skip_instr_count)
|
|
|
|
global_asm = None
|
|
asm_functions = []
|
|
output_lines = []
|
|
|
|
for raw_line in f:
|
|
raw_line = raw_line.rstrip()
|
|
line = raw_line.lstrip()
|
|
|
|
# Print exactly one output line per source line, to make compiler
|
|
# errors have correct line numbers. These will be overridden with
|
|
# reasonable content further down.
|
|
output_lines.append('')
|
|
|
|
if global_asm is not None:
|
|
if line.startswith(')'):
|
|
src, fn = global_asm.finish(state)
|
|
for i, line2 in enumerate(src):
|
|
output_lines[start_index + i] = line2
|
|
asm_functions.append(fn)
|
|
global_asm = None
|
|
else:
|
|
global_asm.process_line(line)
|
|
else:
|
|
if line == 'GLOBAL_ASM(':
|
|
global_asm = GlobalAsmBlock()
|
|
start_index = len(output_lines)
|
|
elif line.startswith('GLOBAL_ASM("') and line.endswith('")'):
|
|
global_asm = GlobalAsmBlock()
|
|
fname = line[len('GLOBAL_ASM') + 2 : -2]
|
|
with open(fname) as f:
|
|
for line2 in f:
|
|
global_asm.process_line(line2)
|
|
src, fn = global_asm.finish(state)
|
|
output_lines[-1] = ''.join(src)
|
|
asm_functions.append(fn)
|
|
global_asm = None
|
|
else:
|
|
output_lines[-1] = raw_line
|
|
|
|
if print_source:
|
|
for line in output_lines:
|
|
print(line)
|
|
|
|
return asm_functions
|
|
|
|
def fixup_objfile(objfile_name, functions, asm_prelude, assembler):
|
|
SECTIONS = ['.data', '.text', '.rodata', '.bss']
|
|
|
|
with open(objfile_name, 'rb') as f:
|
|
objfile = ElfFile(f.read())
|
|
|
|
prev_locs = {
|
|
'.text': 0,
|
|
'.data': 0,
|
|
'.rodata': 0,
|
|
'.bss': 0,
|
|
}
|
|
to_copy = {
|
|
'.text': [],
|
|
'.data': [],
|
|
'.rodata': [],
|
|
}
|
|
asm = []
|
|
late_rodata = []
|
|
late_rodata_asm = []
|
|
late_rodata_source_name = None
|
|
|
|
# Generate an assembly file with all the assembly we need to fill in. For
|
|
# simplicity we pad with nops/.space so that addresses match exactly, so we
|
|
# don't have to fix up relocations/symbol references.
|
|
all_text_glabels = set()
|
|
for (text_glabels, body, fn_late_rodata, fn_late_rodata_body, data) in functions:
|
|
ifdefed = False
|
|
for sectype, (temp_name, size) in data.items():
|
|
if temp_name is None:
|
|
continue
|
|
assert size > 0
|
|
loc = objfile.symtab.find_symbol(temp_name)
|
|
if loc is None:
|
|
ifdefed = True
|
|
break
|
|
loc = loc[1]
|
|
prev_loc = prev_locs[sectype]
|
|
assert loc >= prev_loc, sectype
|
|
if loc != prev_loc:
|
|
asm.append('.section ' + sectype)
|
|
if sectype == '.text':
|
|
for i in range((loc - prev_loc) // 4):
|
|
asm.append('nop')
|
|
else:
|
|
asm.append('.space {}'.format(loc - prev_loc))
|
|
if sectype != '.bss':
|
|
to_copy[sectype].append((loc, size))
|
|
prev_locs[sectype] = loc + size
|
|
if not ifdefed:
|
|
all_text_glabels.update(text_glabels)
|
|
late_rodata.extend(fn_late_rodata)
|
|
late_rodata_asm.extend(fn_late_rodata_body)
|
|
asm.append('.text')
|
|
for line in body:
|
|
asm.append(line)
|
|
if late_rodata_asm:
|
|
late_rodata_source_name = '_asmpp_late_rodata'
|
|
asm.append('.rdata')
|
|
asm.append('glabel {}'.format(late_rodata_source_name))
|
|
asm.extend(late_rodata_asm)
|
|
|
|
o_file = tempfile.NamedTemporaryFile(prefix='asm-processor', suffix='.o', delete=False)
|
|
o_name = o_file.name
|
|
o_file.close()
|
|
s_file = tempfile.NamedTemporaryFile(prefix='asm-processor', suffix='.s', delete=False)
|
|
s_name = s_file.name
|
|
try:
|
|
s_file.write(asm_prelude + b'\n')
|
|
for line in asm:
|
|
s_file.write(line.encode('utf-8') + b'\n')
|
|
s_file.close()
|
|
ret = os.system(assembler + " " + s_name + " -o " + o_name)
|
|
if ret != 0:
|
|
raise Exception("failed to assemble")
|
|
with open(o_name, 'rb') as f:
|
|
asm_objfile = ElfFile(f.read())
|
|
|
|
# Remove some clutter from objdump output
|
|
objfile.drop_irrelevant_sections()
|
|
|
|
# Unify reginfo sections
|
|
target_reginfo = objfile.find_section('.reginfo')
|
|
source_reginfo_data = list(asm_objfile.find_section('.reginfo').data)
|
|
data = list(target_reginfo.data)
|
|
for i in range(20):
|
|
data[i] |= source_reginfo_data[i]
|
|
target_reginfo.data = bytes(data)
|
|
|
|
# Move over section contents
|
|
modified_text_positions = set()
|
|
last_rodata_pos = 0
|
|
for sectype in SECTIONS:
|
|
if sectype == '.bss':
|
|
continue
|
|
source = asm_objfile.find_section(sectype)
|
|
target = objfile.find_section(sectype)
|
|
if source is None or not to_copy[sectype]:
|
|
continue
|
|
assert target is not None, "must have a section to overwrite: " + sectype
|
|
data = list(target.data)
|
|
for (pos, count) in to_copy[sectype]:
|
|
data[pos:pos + count] = source.data[pos:pos + count]
|
|
if sectype == '.text':
|
|
assert count % 4 == 0
|
|
assert pos % 4 == 0
|
|
for i in range(count // 4):
|
|
modified_text_positions.add(pos + 4 * i)
|
|
elif sectype == '.rodata':
|
|
last_rodata_pos = pos + count
|
|
target.data = bytes(data)
|
|
|
|
# Move over late rodata. This is heuristic, sadly, since I can't think
|
|
# of another way of doing it.
|
|
moved_late_rodata = {}
|
|
if late_rodata:
|
|
source = asm_objfile.find_section('.rodata')
|
|
target = objfile.find_section('.rodata')
|
|
source_pos = asm_objfile.symtab.find_symbol(late_rodata_source_name)
|
|
assert source_pos is not None and source_pos[0] == source.index
|
|
source_pos = source_pos[1]
|
|
new_data = list(target.data)
|
|
for dummy_bytes in late_rodata:
|
|
pos = target.data.index(dummy_bytes, last_rodata_pos)
|
|
new_data[pos:pos+4] = source.data[source_pos:source_pos+4]
|
|
moved_late_rodata[source_pos] = pos
|
|
last_rodata_pos = pos + 4
|
|
source_pos += 4
|
|
target.data = bytes(new_data)
|
|
|
|
# Merge strtab data.
|
|
strtab_adj = len(objfile.symtab.strtab.data)
|
|
objfile.symtab.strtab.data += asm_objfile.symtab.strtab.data
|
|
|
|
# Find relocated symbols
|
|
relocated_symbols = set()
|
|
for sectype in SECTIONS:
|
|
for obj in [asm_objfile, objfile]:
|
|
sec = obj.find_section(sectype)
|
|
if sec is None:
|
|
continue
|
|
for reltab in sec.relocated_by:
|
|
for rel in reltab.relocations:
|
|
relocated_symbols.add(obj.symtab.symbol_entries[rel.sym_index])
|
|
|
|
# Move over symbols, deleting the temporary function labels.
|
|
# Sometimes this naive procedure results in duplicate symbols, or UNDEF
|
|
# symbols that are also defined the same .o file. Hopefully that's fine.
|
|
# Skip over local symbols that aren't used relocated against, to avoid
|
|
# conflicts.
|
|
new_local_syms = [s for s in objfile.symtab.local_symbols() if not is_temp_name(s.name)]
|
|
new_global_syms = [s for s in objfile.symtab.global_symbols() if not is_temp_name(s.name)]
|
|
for i, s in enumerate(asm_objfile.symtab.symbol_entries):
|
|
is_local = (i < asm_objfile.symtab.sh_info)
|
|
if is_local and s not in relocated_symbols:
|
|
continue
|
|
if is_temp_name(s.name):
|
|
continue
|
|
if s.st_shndx not in [SHN_UNDEF, SHN_ABS]:
|
|
section_name = asm_objfile.sections[s.st_shndx].name
|
|
assert section_name in SECTIONS, "Generated assembly .o must only have symbols for .text, .data, .rodata, ABS and UNDEF, but found {}".format(section_name)
|
|
s.st_shndx = objfile.find_section(section_name).index
|
|
# glabel's aren't marked as functions, making objdump output confusing. Fix that.
|
|
if s.name in all_text_glabels:
|
|
s.type = STT_FUNC
|
|
if objfile.sections[s.st_shndx].name == '.rodata' and s.st_value in moved_late_rodata:
|
|
s.st_value = moved_late_rodata[s.st_value]
|
|
s.st_name += strtab_adj
|
|
if is_local:
|
|
new_local_syms.append(s)
|
|
else:
|
|
new_global_syms.append(s)
|
|
new_syms = new_local_syms + new_global_syms
|
|
for i, s in enumerate(new_syms):
|
|
s.new_index = i
|
|
objfile.symtab.data = b''.join(s.to_bin() for s in new_syms)
|
|
objfile.symtab.sh_info = len(new_local_syms)
|
|
|
|
# Move over relocations
|
|
for sectype in SECTIONS:
|
|
source = asm_objfile.find_section(sectype)
|
|
target = objfile.find_section(sectype)
|
|
|
|
if target is not None:
|
|
# fixup relocation symbol indices, since we butchered them above
|
|
for reltab in target.relocated_by:
|
|
nrels = []
|
|
for rel in reltab.relocations:
|
|
if sectype == '.text' and rel.r_offset in modified_text_positions:
|
|
# don't include relocations for late_rodata dummy code
|
|
continue
|
|
# hopefully we don't have relocations for local or
|
|
# temporary symbols, so new_index exists
|
|
rel.sym_index = objfile.symtab.symbol_entries[rel.sym_index].new_index
|
|
nrels.append(rel)
|
|
reltab.relocations = nrels
|
|
reltab.data = b''.join(rel.to_bin() for rel in nrels)
|
|
|
|
if not source:
|
|
continue
|
|
|
|
target_reltab = objfile.find_section('.rel' + sectype)
|
|
target_reltaba = objfile.find_section('.rela' + sectype)
|
|
for reltab in source.relocated_by:
|
|
for rel in reltab.relocations:
|
|
rel.sym_index = asm_objfile.symtab.symbol_entries[rel.sym_index].new_index
|
|
if sectype == '.rodata' and rel.r_offset in moved_late_rodata:
|
|
rel.r_offset = moved_late_rodata[rel.r_offset]
|
|
new_data = b''.join(rel.to_bin() for rel in reltab.relocations)
|
|
if reltab.sh_type == SHT_REL:
|
|
if not target_reltab:
|
|
target_reltab = objfile.add_section('.rel' + sectype,
|
|
sh_type=SHT_REL, sh_flags=0,
|
|
sh_link=objfile.symtab.index, sh_info=target.index,
|
|
sh_addralign=4, sh_entsize=8, data=b'')
|
|
target_reltab.data += new_data
|
|
else:
|
|
if not target_reltaba:
|
|
target_reltaba = objfile.add_section('.rela' + sectype,
|
|
sh_type=SHT_RELA, sh_flags=0,
|
|
sh_link=objfile.symtab.index, sh_info=target.index,
|
|
sh_addralign=4, sh_entsize=12, data=b'')
|
|
target_reltaba.data += new_data
|
|
|
|
objfile.write(objfile_name)
|
|
finally:
|
|
s_file.close()
|
|
os.remove(s_name)
|
|
try:
|
|
os.remove(o_name)
|
|
except:
|
|
pass
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser(description="Pre-process .c files and post-process .o files to enable embedding assembly into C.")
|
|
parser.add_argument('filename', help="path to .c code")
|
|
parser.add_argument('--post-process', dest='objfile', help="path to .o file to post-process")
|
|
parser.add_argument('--assembler', dest='assembler', help="assembler command (e.g. \"mips-linux-gnu-as -march=vr4300 -mabi=32\")")
|
|
parser.add_argument('--asm-prelude', dest='asm_prelude', help="path to a file containing a prelude to the assembly file (with .set and .macro directives, e.g.)")
|
|
parser.add_argument('-framepointer', dest='framepointer', action='store_true')
|
|
parser.add_argument('-g3', dest='g3', action='store_true')
|
|
group = parser.add_mutually_exclusive_group(required=True)
|
|
group.add_argument('-O2', dest='o2', action='store_true')
|
|
group.add_argument('-g', dest='o2', action='store_false')
|
|
args = parser.parse_args()
|
|
opt = 'O2' if args.o2 else 'g'
|
|
if args.g3:
|
|
if opt != 'O2':
|
|
print("-g3 is only supported together with -O2", file=sys.stderr)
|
|
exit(1)
|
|
opt = 'g3'
|
|
|
|
if args.objfile is None:
|
|
with open(args.filename) as f:
|
|
parse_source(f, print_source=True, opt=opt, framepointer=args.framepointer)
|
|
else:
|
|
assert args.assembler is not None, "must pass assembler command"
|
|
with open(args.filename) as f:
|
|
functions = parse_source(f, print_source=False, opt=opt, framepointer=args.framepointer)
|
|
if not functions:
|
|
return
|
|
asm_prelude = b''
|
|
if args.asm_prelude:
|
|
with open(args.asm_prelude, 'rb') as f:
|
|
asm_prelude = f.read()
|
|
fixup_objfile(args.objfile, functions, asm_prelude, args.assembler)
|
|
|
|
if __name__ == "__main__":
|
|
main()
|