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208
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1 import binascii
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2 from asmnodes import ALabel
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3 """
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4 The output stream is a stream of instructions that can be output
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5 to a file or binary or hexfile.
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6 """
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7
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8 class OutputStream:
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9 def __init__(self):
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10 self.sections = {}
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11 self.currentSection = None
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12 def emit(self, item):
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13 self.sections[self.currentSection].append(item)
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14 def selectSection(self, s):
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15 self.currentSection = s
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16 if not s in self.sections:
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17 self.sections[s] = []
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18
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19 def backpatch(self):
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20 """ Fixup references to other parts in the assembler """
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21 for s in self.sections:
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22 # TODO parameterize this:
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23 if s == 'code':
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24 address = 0x08000000
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25 elif s == 'data':
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26 address = 0x02000000
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27 else:
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28 address = 0x0
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29 for i in self.sections[s]:
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30 i.address = address
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31 if type(i) is ALabel:
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32 continue
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33 bts = i.encode()
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34 address += len(bts)
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35
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36 def dump(self):
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37 self.backpatch()
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38 for s in sorted(self.sections.keys()):
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39 self.dumpSection(s)
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40
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41 def dumpSection(self, s):
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42 print('.section '+s)
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43 for i in self.sections[s]:
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44 if type(i) is ALabel:
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45 print(i)
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46 else:
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47 addr = i.address
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48 insword = i.encode()
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49 assert type(insword) is bytes
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50 insword = binascii.hexlify(bytes(reversed(insword))).decode('ascii')
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51 asm = str(i)
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52 print(' 0x{0:08x} 0x{1} {2}'.format(addr, insword, asm))
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53
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54 class TextOutputStream(OutputStream):
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55 pass
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56
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57 class BinOutputStream(OutputStream):
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58 def dump(self):
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59 pass
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60
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