mirror of https://github.com/Shizmob/smol
81 lines
2.5 KiB
Python
81 lines
2.5 KiB
Python
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import sys
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from smolshared import *
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def output_x86(libraries, outf):
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outf.write('; vim: set ft=nasm:\n') # be friendly
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outf.write('bits 32\n')
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shorts = { l: l.split('.', 1)[0].lower().replace('-', '_') for l in libraries }
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outf.write('%include "header32.asm"\n')
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outf.write('.dynamic.needed:\n')
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for library in libraries:
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outf.write('dd 1;DT_NEEDED\n')
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outf.write('dd (_symbols.{} - _symbols)\n'.format(shorts[library]))
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outf.write('.dynamic.end:\n')
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outf.write('_symbols:\n')
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for library, symbols in libraries.items():
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outf.write('\t_symbols.{}: db "{}",0\n'.format(shorts[library], library))
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for sym in symbols:
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hash = hash_djb2(sym)
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outf.write("""
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\t\tglobal {name}
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\t\t{name}: db 0xE9
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\t\t dd 0x{hash:x}
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""".format(name=sym, hash=hash).lstrip('\n'))
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outf.write('\tdb 0\n') # TODO: not a dd?
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outf.write('db 0\n')
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outf.write('_symbols.end:\n')
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outf.write('%include "loader32.asm"\n')
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def output_amd64(libraries, outf):
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outf.write('; vim: set ft=nasm:\n')
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outf.write('bits 64\n')
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shorts = { l: l.split('.', 1)[0].lower().replace('-', '_') for l in libraries }
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outf.write('%include "header64.asm"\n')
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outf.write('dynamic.needed:\n')
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for library in libraries:
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outf.write('dq 1;DT_NEEDED\n')
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outf.write('dq (_symbols.{} - _symbols)\n'.format(shorts[library]))
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outf.write('dynamic.end:\n')
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outf.write('[section .data.smolgot]\n')
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outf.write('_symbols:\n')
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for library, symbols in libraries.items():
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outf.write('\t_symbols.{}: db "{}",0\n'.format(shorts[library], library))
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for sym in symbols:
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hash = hash_djb2(sym)
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outf.write('\t\t_symbols.{lib}.{name}: dq 0x{hash:x}\n'\
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.format(lib=shorts[library],name=sym,hash=hash))
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outf.write('\tdq 0\n')
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outf.write('db 0\n')
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outf.write('_symbols.end:\n')
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outf.write('_smolplt:\n')
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for library, symbols in libraries.items():
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for sym in symbols:
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outf.write("""
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[section .text.smolplt.{name}]
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global {name}
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{name}:
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jmp [rel _symbols.{lib}.{name}]
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""".format(lib=shorts[library],name=sym).lstrip('\n'))
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outf.write('_smolplt.end:\n')
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outf.write('%include "loader64.asm"\n')
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def output(arch, libraries, outf):
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if arch == 'i386': output_x86(libraries, outf)
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elif arch == 'x86_64': output_amd64(libraries, outf)
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else:
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eprintf("E: cannot emit for arch '" + str(arch) + "'")
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sys.exit(1)
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