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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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219
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8 class Alignment:
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9 def __init__(self, a):
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10 self.align = a
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11
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208
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12 class OutputStream:
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13 def __init__(self):
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14 self.sections = {}
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15 self.currentSection = None
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16 def emit(self, item):
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17 self.sections[self.currentSection].append(item)
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219
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18
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19 def align(self, alignment):
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20 self.emit(Alignment(alignment))
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21
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208
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22 def selectSection(self, s):
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23 self.currentSection = s
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24 if not s in self.sections:
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25 self.sections[s] = []
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26
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27 def backpatch(self):
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28 """ Fixup references to other parts in the assembler """
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29 for s in self.sections:
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30 # TODO parameterize this:
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31 if s == 'code':
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32 address = 0x08000000
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33 elif s == 'data':
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34 address = 0x02000000
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35 else:
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36 address = 0x0
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37 for i in self.sections[s]:
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38 i.address = address
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39 if type(i) is ALabel:
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40 continue
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219
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41 if type(i) is Alignment:
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42 while (address % i.align) != 0:
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43 address += 1
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44 continue
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208
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45 bts = i.encode()
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46 address += len(bts)
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47
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48 def dump(self):
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49 self.backpatch()
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50 for s in sorted(self.sections.keys()):
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51 self.dumpSection(s)
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52
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53 def dumpSection(self, s):
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54 print('.section '+s)
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55 for i in self.sections[s]:
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56 if type(i) is ALabel:
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57 print(i)
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219
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58 elif type(i) is Alignment:
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59 pass
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208
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60 else:
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61 addr = i.address
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62 insword = i.encode()
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63 assert type(insword) is bytes
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64 insword = binascii.hexlify(bytes(reversed(insword))).decode('ascii')
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65 asm = str(i)
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66 print(' 0x{0:08x} 0x{1} {2}'.format(addr, insword, asm))
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67
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68 class TextOutputStream(OutputStream):
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69 pass
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70
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71 class BinOutputStream(OutputStream):
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72 def dump(self):
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73 pass
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74
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