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208
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1 import binascii
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249
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2 from target import Instruction, Label, DebugInfo
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234
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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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249
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27 def debugInfos(self):
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28 di = [i for i in self.instructions if isinstance(i, DebugInfo)]
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29 return di
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30
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208
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31 class OutputStream:
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32 def __init__(self):
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33 self.sections = {}
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34 self.currentSection = None
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225
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35
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208
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36 def emit(self, item):
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237
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37 assert self.currentSection
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38 self.sections[self.currentSection].emit(item)
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219
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39
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208
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40 def selectSection(self, s):
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41 self.currentSection = s
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249
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42 self.getSection(s)
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208
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43
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235
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44 def getLabelAddress(self, lname):
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45 assert isinstance(lname, str)
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234
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46 for s in self.sections.values():
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237
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47 for i in s.instructions:
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234
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48 if type(i) is Label:
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235
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49 if i.name == lname:
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234
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50 return i.address
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51 return 0
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52
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249
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53 def getSection(self, name):
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54 if not name in self.sections:
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55 self.sections[name] = Section()
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56 return self.sections[name]
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57
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208
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58 def backpatch(self):
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59 """ Fixup references to other parts in the assembler """
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60 for s in self.sections:
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61 # TODO parameterize this:
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62 if s == 'code':
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63 address = 0x08000000
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64 elif s == 'data':
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65 address = 0x02000000
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66 else:
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67 address = 0x0
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237
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68
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69 for i in self.sections[s].instructions:
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208
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70 i.address = address
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234
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71 i.resolve(self.getLabelAddress)
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208
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72 bts = i.encode()
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73 address += len(bts)
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74
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75 def dump(self):
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76 self.backpatch()
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236
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77 self.backpatch()
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208
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78 for s in sorted(self.sections.keys()):
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79 self.dumpSection(s)
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80
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81 def dumpSection(self, s):
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237
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82 print('.section '+ s)
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83 for i in self.sections[s].instructions:
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234
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84 addr = i.address
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85 insword = i.encode()
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86 assert type(insword) is bytes
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87 insword = binascii.hexlify(bytes(reversed(insword))).decode('ascii')
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88 asm = str(i)
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235
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89 if len(insword) == 0:
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90 print(' {}'.format(asm))
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91 else:
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92 print(' 0x{0:08x} 0x{1} {2}'.format(addr, insword, asm))
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208
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93
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94 class TextOutputStream(OutputStream):
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95 pass
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96
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97 class BinOutputStream(OutputStream):
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98
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236
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99 @property
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100 def Data(self):
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101 d = self.dump()
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102 return bytes(d)
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103
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104 def dump(self):
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105 self.backpatch()
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106 self.backpatch()
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237
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107 section = self.sections[list(self.sections.keys())[0]]
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108 return section.to_bytes()
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236
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109
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110
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