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Commit the *correct* note about the gcc6809 code generation bug.
author William Astle <lost@l-w.ca>
date Thu, 24 Mar 2016 19:25:14 -0600
parents 40de99bde5e0
children b4d0eafc5bfe
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1 These files are extra utility type scripts that can be used for various
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2 purposes.
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3
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4 as
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5
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6 This is a sort of front-end script that makes lwasm look approximately like
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7 gnu as which is useful for using lwasm as a backend to gcc. You may need to
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8 edit it to make it work fully.
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9
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10 ld
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11
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12 Similar to the "as" script above except for lwlink.
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15 ar
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16
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17 Similar to the "as" script above except for lwar.
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18
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19 gcc6809lw-*.patch
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20
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21 These are patches to the main gcc source distribution for specific releases.
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22 The last number after the dash is a patch level for the specific patch. It
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23 is worth noting that a patch for a particular minor version of GCC may work
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24 with later minor versions in the same release sequence. That is, a patch
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25 for 4.6.1 might work with 4.6.4. These are different to the official
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26 gcc6809 releases in the following ways. First, all the source for as-6809
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27 is removed. Also, the special "helper" makefile and directory is removed.
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28 Also, as of this writing, the latest "official" release was for gcc 4.3.4
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29 which does not build on 64 bit linux.
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31 In the event you have used the "official" gcc6809 with the default as6809
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32 assembler that comes with it, you should be aware that while lwasm is mostly
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33 compatible with it syntax wise, there are differences, particularly in
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34 pseudo operations and source line syntax (most notably that you must have
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35 whitespace preceeding assembler directives and instructions). You will
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36 likely not run into these unless you are using inline asm. Refer to the
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37 lwtools documentation for the specific line format required by lwasm.
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38
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39 It is worth noting that neither gcc6809 nor lwtools comes with a standard C
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40 library.
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41
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42 It is also worth noting that for many projects, it will be more flexible to
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43 invoke lwlink directly rather than using the ld script or gcc as a front
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44 end. See the lwtools documentation for details on using lwlink.
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45
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46 To use these scripts, you really need to understand how to build a gcc as a
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47 cross compiler. The basics are that you put the as, ld, and ar scripts
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48 whereever you plan to put your cross-development binaries. Then, when
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49 building the cross compiler, you tell it where the scripts are.
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50
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51 Please note that the following recipe is an example only. If you are
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52 planning to install multiple instances of gcc6809 for different targets, you
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53 will most certainly need to modify the steps below. Providing a complete
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54 understanding of building a gcc toolchain for cross compilation is well
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55 beyond the scope of this document.
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56
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57 The following works for a single installation.
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59 1. Install the ar, as, and ld scripts named m6809-unknown-{as,ar,ld} in a
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60 directory in your path, say /usr/local/coco/bin/.
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61
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62 2. Make symbolic links to /bin/true for similarly named nm, objdump, ranlib,
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63 and strip in the same directory Some of these may not be necessary.
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64
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65 3. Unpack gcc and apply the gcc6809 patch. The gcc6809lw* patch file
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66 in this directory is known to work with these instructions.
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68 4. Make sure /usr/local/coco/bin is in your PATH
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70 5. Make sure "." is NOT in your path or is at the END of PATH. If you have
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71 gazillions of errors pop up compiling "gemodes.c", this is your problem.
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73 6. In a directory (other than the gcc source, say "gcc-build" at the same
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74 level as the main gcc directory, do (assuming gcc 4.3.4):
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75
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76 configure --enable-languages=c --target=m6809-unknown \
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77 --program-prefix=m6809-unknown- --enable-obsolete \
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78 --srcdir=../gcc-4.3.4 --disable-threads --disable-nls \
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79 --disable-libssp --prefix=/usr/local/coco \
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80 --with-as=/usr/local/coco/bin/m6809-unknown-as \
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81 --with-ld=/usr/local/coco/bin/m6809-unknown-ld \
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82 --with-ar=/usr/local/coco/bin/m6809-unknown-ar
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83
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84 NOTE: the last three are required to prevent selection of the wrong binutils
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85 programs at runtime.
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86
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87 --with-sysroot might be useful if you have a C library involved.
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88
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89 7. Run "make". If errors appear, troubleshoot.
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90
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91 8. Run "make install". Note that you will have to have your PATH variable
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92 for "root" set up correctly if your install prefix requires root privileges.
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93
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94 The above is WOMM certified. YMMV.
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95
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96 NOTES ABOUT GCC6809
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97 ===================
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98
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99 There is one known code generation bug with current versions of gcc6809. If
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100 you are getting bad behaviour for some reason and are using optimization
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101 (-O1 or higher, -Os), you may be hitting this bug. If someone who
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102 understands the gcc code is willing to look at it, patches for the patch
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103 would be welcome (especially if that patch moves the base gcc version
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104 upward). It is not clear whether this is a bug in the m6809 specific code
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105 or the gcc core though it seems like it's in the gcc core. Disabling
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106 optimization completely seems to generate correct, if suboptimal, code.
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107
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108 NOTES ABOUT SPECIFIC PATCHES
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109 ============================
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110
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111 gcc6809lw-4.6.4-2.patch
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112
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113 This patch essentially disables the "soft registers". These were causing
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114 problems leading to compiler crashes. Removing the "t" constraint from
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115 the instruction patterns allowed various issues to go away. It is not clear
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116 if the original reasoning behind these soft registers is even valid any
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117 more.
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118
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119 Also fixes a clearly incorrect comparision when determining if a constant
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120 fits in 16 bits. For clarity, both the 8 bit and 16 bit comparisons are
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121 replaced with straight forward range comparisons rather than the excessively
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122 clever scheme that was present before.
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123
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124 gcc6809lw-4.6.4-3.patch
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125
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126 This is identical to the -2 version except it fixes the crt0.S file so it
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127 builds properly with the --pragma=newsource option. In fact, it never did
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128 build properly due to spaces in operands anyway. However, since gcc6809
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129 doesn't come with a C library, it hasn't proved to be an issue.
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130
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131 Patches to provide a proper crt0.S file based around the actual way lwtools
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132 works will be considered.
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133
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134 It's also worth noting that there are features inherited from previous
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135 versions of gcc6809 that are not properly supported by these patches. In
c8ae69cdb5a9 Update gcc6809 patch to work with pragma=newsource
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136 particular, banking and "far calls" are not supported because there are no
c8ae69cdb5a9 Update gcc6809 patch to work with pragma=newsource
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137 targets supported by lwtools that do anything meaningful in the face of such
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138 things. Patches to clean that up are also welcome. Either to do something
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139 meaningful or to remove such features entirely.
c8ae69cdb5a9 Update gcc6809 patch to work with pragma=newsource
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140