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208
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1 import binascii
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234
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2 from target import Instruction, Label
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3
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208
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4 """
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5 The output stream is a stream of instructions that can be output
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6 to a file or binary or hexfile.
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7 """
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8
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219
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9
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237
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10 class Section:
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11 def __init__(self):
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12 self.instructions = []
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13
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14 def emit(self, item):
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15 assert isinstance(item, Instruction)
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16 self.instructions.append(item)
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17
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18 def to_bytes(self):
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19 d = bytearray()
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20 for i in self.instructions:
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21 addr = i.address
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22 insword = i.encode()
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23 assert type(insword) is bytes
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24 d.extend(insword)
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25 return bytes(d)
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26
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208
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27 class OutputStream:
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28 def __init__(self):
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29 self.sections = {}
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30 self.currentSection = None
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225
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31
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208
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32 def emit(self, item):
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237
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33 assert self.currentSection
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34 self.sections[self.currentSection].emit(item)
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219
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35
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208
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36 def selectSection(self, s):
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37 self.currentSection = s
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38 if not s in self.sections:
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237
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39 self.sections[s] = Section()
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208
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40
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235
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41 def getLabelAddress(self, lname):
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42 assert isinstance(lname, str)
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234
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43 for s in self.sections.values():
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237
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44 for i in s.instructions:
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234
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45 if type(i) is Label:
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235
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46 if i.name == lname:
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234
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47 return i.address
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48 return 0
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49
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208
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50 def backpatch(self):
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51 """ Fixup references to other parts in the assembler """
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52 for s in self.sections:
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53 # TODO parameterize this:
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54 if s == 'code':
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55 address = 0x08000000
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56 elif s == 'data':
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57 address = 0x02000000
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58 else:
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59 address = 0x0
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237
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60
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61 for i in self.sections[s].instructions:
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208
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62 i.address = address
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234
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63 i.resolve(self.getLabelAddress)
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208
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64 bts = i.encode()
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65 address += len(bts)
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66
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67 def dump(self):
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68 self.backpatch()
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236
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69 self.backpatch()
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208
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70 for s in sorted(self.sections.keys()):
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71 self.dumpSection(s)
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72
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73 def dumpSection(self, s):
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237
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74 print('.section '+ s)
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75 for i in self.sections[s].instructions:
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234
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76 addr = i.address
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77 insword = i.encode()
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78 assert type(insword) is bytes
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79 insword = binascii.hexlify(bytes(reversed(insword))).decode('ascii')
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80 asm = str(i)
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235
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81 if len(insword) == 0:
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82 print(' {}'.format(asm))
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83 else:
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84 print(' 0x{0:08x} 0x{1} {2}'.format(addr, insword, asm))
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208
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85
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86 class TextOutputStream(OutputStream):
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87 pass
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88
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89 class BinOutputStream(OutputStream):
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90
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236
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91 @property
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92 def Data(self):
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93 d = self.dump()
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94 return bytes(d)
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95
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96 def dump(self):
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97 self.backpatch()
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98 self.backpatch()
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237
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99 section = self.sections[list(self.sections.keys())[0]]
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100 return section.to_bytes()
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236
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101
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102
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