FreeCalypso > hg > tcs211-l1-reconst

annotate STATUS @ 284:33b35965b4a0

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STATUS: began analysis of the differences in the non-exact objects
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 14 Mar 2017 19:07:14 +0000
parents 974835ad720c
children 4d9af8de3973
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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283
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Mychaela Falconia <falcon@freecalypso.org>
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1 Objects in l1_ext.lib:
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2
284
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3 l1_afunc.obj: not exact, see explanation below
283
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Mychaela Falconia <falcon@freecalypso.org>
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4 l1_async.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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5 l1_cmplx.obj: perfect match to 20070608 version except line number points
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Mychaela Falconia <falcon@freecalypso.org>
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6 l1_init.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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7 l1_pwmgr.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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8 l1_small.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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9 l1_sync.obj: not exact, needs review
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Mychaela Falconia <falcon@freecalypso.org>
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10 l1_trace.obj: bits match perfectly, diff only in symbolic metadata
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Mychaela Falconia <falcon@freecalypso.org>
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11
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Mychaela Falconia <falcon@freecalypso.org>
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12 l1_dyn_dwl_afunc.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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13 l1_dyn_dwl_apihisr.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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14 l1_dyn_dwl_async.obj: perfect match
284
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15 l1_dyn_dwl_func.obj: not exact, see explanation below
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16 l1_dyn_dwl_init.obj: sole diff is in the num_of_primitives oddity,
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17 see explanation below
283
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18 l1_dyn_dwl_sync.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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19
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Mychaela Falconia <falcon@freecalypso.org>
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20 l1audio_abb.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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21 l1audio_afunc.obj: bits match perfectly, diff only in symbolic metadata
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Mychaela Falconia <falcon@freecalypso.org>
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22 l1audio_async.obj: diffs only in register alloc and symbolic metadata
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Mychaela Falconia <falcon@freecalypso.org>
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23 l1audio_back.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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24 l1audio_drive.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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25 l1audio_init.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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26
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27 l1tm_async.obj: bits match perfectly, diff only in the line number points
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Mychaela Falconia <falcon@freecalypso.org>
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28 l1tm_func.obj: bits match perfectly, diffs only in symbolic and line numbers
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29 l1tm_stats.obj: perfect match
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30
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31 Objects in l1_int.lib:
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32
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33 dl1_com.obj: not exact, needs review
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Mychaela Falconia <falcon@freecalypso.org>
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34 l1_api_hisr.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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35 l1_cmplx_intram.obj: perfect match to 20070608 version
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Mychaela Falconia <falcon@freecalypso.org>
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36 l1_ctl.obj: perfect match to 20070608 version
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Mychaela Falconia <falcon@freecalypso.org>
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37 l1_drive.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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38 l1_func.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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39 l1_mfmgr.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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40 l1_sync_intram.obj: not exact, needs review
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Mychaela Falconia <falcon@freecalypso.org>
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41
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Mychaela Falconia <falcon@freecalypso.org>
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42 l1audio_func.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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43 l1audio_sync.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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44
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Mychaela Falconia <falcon@freecalypso.org>
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45 Objects in l1_custom_ext.lib:
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46
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47 l1audio_cust.obj: dead functions not reconstructed, perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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48 otherwise
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Mychaela Falconia <falcon@freecalypso.org>
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49 l1tm_cust.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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50 l1tm_tpu12.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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51
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52 Objects in l1_custom_int.lib:
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53
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Mychaela Falconia <falcon@freecalypso.org>
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54 ind_os.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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55 l1_cust.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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56
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Mychaela Falconia <falcon@freecalypso.org>
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57 Objects in tpudrv.lib:
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58
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Mychaela Falconia <falcon@freecalypso.org>
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59 tpudrv.obj: perfect match
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Mychaela Falconia <falcon@freecalypso.org>
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60 tpudrv12.obj: not exact, needs review
284
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61
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62 Detailed analysis of differences, i.e., cases where the reconstructed C code
33b35965b4a0 STATUS: began analysis of the differences in the non-exact objects
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63 compiles into an object that is not bit-identical to the original blob:
33b35965b4a0 STATUS: began analysis of the differences in the non-exact objects
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parents: 283
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64
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Mychaela Falconia <falcon@freecalypso.org>
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65 l1_afunc.obj:
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Mychaela Falconia <falcon@freecalypso.org>
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66
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67 The l1_afunc.c module from LoCosto is used without any changes:
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68 it compiled right away after adding one constant to l1_const.h,
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69 and the result of recompilation is identical to the original up until
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70 the l1a_clip_txpwr() function, which is the last function in the module.
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71
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72 Disassembly of the original blob version of this function has been
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73 analyzed and found to be identical in logic to the available C code,
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74 but there must have been some change to the code expression that
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75 results in different output from the compiler. In particular, the
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76 symbolic info indicates the present of a local variable named power
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77 in the original, but no such local var exists in the LoCosto version.
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78 The TSM30 version was of no help as it is entirely different there.
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79
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80 See g23m/objdiff/l1_ext/l1_afunc.notes for further info.
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81
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82 l1_sync.obj: needs further review
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83 l1_sync_intram.obj: ditto
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84
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85 dl1_com.obj: not exact, needs review
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parents: 283
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86
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87 l1_dyn_dwl_func.obj:
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88
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89 The LoCosto version uses a function (implemented in l1_func.c in
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90 the LoCosto code) named l1_memcpy_16bit() to download patch bits
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91 into the DSP's API RAM; the function does what the name says, and
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parents: 283
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92 the logic of using 16-bit accesses when hitting this API RAM makes
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parents: 283
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93 perfect sense to me (Mychaela). The original TCS211 code apparently
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parents: 283
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94 used plain memcpy(), which the compiler turned into its C$MEMCPY call.
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parents: 283
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95
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96 If one does a #define l1_memcpy_16bit memcpy in l1_dyn_dwl_func.c,
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Mychaela Falconia <falcon@freecalypso.org>
parents: 283
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97 the resulting l1_dyn_dwl_func.obj is almost bit-identical to the
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Mychaela Falconia <falcon@freecalypso.org>
parents: 283
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98 original blob: the only diff is in register allocation - the compiler's
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99 register allocator picks a different choice of registers, but all
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100 instructions still perfectly line up.
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parents: 283
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101
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102 For production use of our reconstructed TCS211 L1 code, we have adopted
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103 the version with l1_memcpy_16bit() - the function body itself has been
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parents: 283
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104 moved into l1_dyn_dwl_func.c so that l1_func.c remains a perfect match.
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parents: 283
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105
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106 l1_dyn_dwl_init.obj:
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107
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108 In the TCS211 configuration without L1_GTT, there are a total of 5
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109 signals (aka primitives aka L1 messages) which trigger a dynamic
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parents: 283
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110 DSP patch download. These 5 signals are enumerated in
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111 signal_patch_array[] in l1_dyn_dwl_afunc.c (which has been reconstructed
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parents: 283
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112 to a perfect match), and their total count (which should be 5) goes into
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113 l1a.dyn_dwnld.num_of_primitives, set in l1_dyn_dwnld_initialize_var() in
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114 l1_dyn_dwl_init.c.
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115
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116 In the original blob version this num_of_primitives variable ends up
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parents: 283
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117 being set to 6: first set to 2, then incremented by 4. In the LoCosto
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parents: 283
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118 source this var is first set to 0 as they apparently have no patches
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parents: 283
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119 that are independent of compilation config options, and then incremented
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Mychaela Falconia <falcon@freecalypso.org>
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120 for every enabled option.
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Mychaela Falconia <falcon@freecalypso.org>
parents: 283
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121
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122 In our reconstruction we have made the GPRS and AMR_SCH patches and the
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parents: 283
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123 primitives that trigger them mandatory, and conditionalized the E2 and
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parents: 283
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124 AMR_MMS patches on MELODY_E2. The GPRS and AMR_MMS critters are
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parents: 283
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125 preinstalled by the static patch, and get pushed out by AMR_SCH and E2,
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parents: 283
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126 respectively. Of the 5 primitives listed in signal_patch_array[] in
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parents: 283
diff changeset
127 the original blob, the first 2 are always-present core ones, whereas
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Mychaela Falconia <falcon@freecalypso.org>
parents: 283
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128 the last 3 are specific to E2. The AMR_MMS patch is reinstated upon
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129 L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_CON.
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130
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131 Based on the above reasoning, our reconstructed version sets
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132 l1a.dyn_dwnld.num_of_primitives to 5 in the full configuration: first
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133 sets to 2, then increments by 3. If one makes a sans-MELODY_E2 build,
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134 only the GPRS and AMR_SCH patches will be retained, and only the two
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135 non-E2 primitives for entry into and exit from dedicated mode.
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136
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137 l1audio_async.obj:
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138
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139 The only bit diff is in register allocation - the compiler's register
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140 allocator picks a different choice of registers, but all instructions
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141 still perfectly line up. There is also a slight diff in the symbolic
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142 metadata emitted for functions, which might be related to the diff in
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143 the register allocation.
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144
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145 The root cause of these diffs could not be found, but there is no
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146 functional difference as only some in-function temporary registers
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147 have been interchanged.
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148
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149 l1audio_cust.obj:
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150
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151 The original blob version has these demo/test functions at the end of
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152 the module:
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153
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154 audio_melo_e1_demo1_start()
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155 audio_melo_e1_demo1_stop()
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156 audio_melo_e1_demo2_start()
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157 audio_melo_e1_demo2_stop()
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158 audio_melo_e2_load_lsi()
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159 audio_melo_e2_demo1_start()
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160 audio_melo_e2_demo1_stop()
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161 audio_melo_e2_demo2_start()
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162 audio_melo_e2_demo2_stop()
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163
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164 These functions are dead code, i.e., they are not called or referenced
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165 from anywhere else in the firmware, and the link succeeds without them
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166 being present. These dead functions have been omitted from the
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167 reconstructed version. The reconstruction is a perfect match otherwise.
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168
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169 tpudrv12.obj: early reconstruction, needs further review