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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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208
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10 class OutputStream:
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11 def __init__(self):
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12 self.sections = {}
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13 self.currentSection = None
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225
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14
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208
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15 def emit(self, item):
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234
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16 assert isinstance(item, Instruction)
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208
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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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234
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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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234
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27 def getLabelAddress(self, l):
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28 assert isinstance(l, Label)
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29 for s in self.sections.values():
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30 for i in s:
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31 if type(i) is Label:
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32 if i.name == l.name:
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33 return i.address
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34 return 0
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35
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208
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36 def backpatch(self):
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37 """ Fixup references to other parts in the assembler """
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38 for s in self.sections:
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39 # TODO parameterize this:
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40 if s == 'code':
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41 address = 0x08000000
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42 elif s == 'data':
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43 address = 0x02000000
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44 else:
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45 address = 0x0
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46 for i in self.sections[s]:
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47 i.address = address
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234
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48 i.resolve(self.getLabelAddress)
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208
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49 bts = i.encode()
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50 address += len(bts)
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51
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52 def dump(self):
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53 self.backpatch()
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54 for s in sorted(self.sections.keys()):
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55 self.dumpSection(s)
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56
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57 def dumpSection(self, s):
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58 print('.section '+s)
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59 for i in self.sections[s]:
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234
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60 addr = i.address
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61 insword = i.encode()
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62 assert type(insword) is bytes
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63 insword = binascii.hexlify(bytes(reversed(insword))).decode('ascii')
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64 asm = str(i)
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65 print(' 0x{0:08x} 0x{1} {2}'.format(addr, insword, asm))
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208
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66
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67 class TextOutputStream(OutputStream):
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68 pass
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69
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70 class BinOutputStream(OutputStream):
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71 def dump(self):
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72 pass
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73
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