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authorIan Lance Taylor <ian@airs.com>1996-06-28 16:38:05 +0000
committerIan Lance Taylor <ian@airs.com>1996-06-28 16:38:05 +0000
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-The coff patches intend to do the following :
-
- . Generate coff files very compatible with vanilla linker.
- . Understands coff debug directives.
-
-Here are the guidelines of the work I have done :
-
- . Encapsulate format dependent code in macros where it is possible.
- . Where not possible differenciate with #ifdef
- . try not to change the calling conventions of the existing functions.
- I made one exception : symbol_new. I would be pleased to hear about
- a better solution. (symbols.c)
- . Extend the use of N_TYPE_seg seg_N_TYPE tables so that segments can
- be manipulated without using their format dependent name. (subsegs.c)
- . Write a function to parse the .def debug directives
- . Write two small peaces of code to handle the .ln directive.
- . In write.c try to move all the cross compilation specifics (md_..) to
- format dependent files.
- . Encapsulate the data structures using generic types, macros calls.
- . Added too much code to resolve the complexity of the symbol table
- generated. Most of the code deals with debug stuff.
- . Create another makefile, shorter, cleaner.
- . Create a config.gas shell script to mimic the gcc,gdb... configuration
- mechanism. This reduce the complexity of the makefile.
- . Isolate the format dependent code in two files
- coff.c coff.h
- aout.c aout.h
- elf.c elf.h [ Not yet ;-]
- . added a little stack management routine for coff in file stack.c
- . isolate os specific flags in m- files
-
-If further development is planed on it is should solve the following problems :
-
- . Encapsulate DESC & OTHER tests in a macro call. I'm not aware
- of their exact semantics.
- . Clean up the seg_N_TYPE N_TYPE_seg naming scheme
- . Try to remove as much reference to segment dependent names as possible
- . Find a cleaner solution for symbol_new.
- . Report the modifications on vax, ns32k, sparc machine dependent files.
- To acheive this goal, search for \<N_, sy_, symbol_new and symbolS.
- . Allow an arbitrary number of segments (spare sections .ctor .dtor .bletch)
- . Find a way to extend the debug information without breaking sdb
- compatibility. Mainly intended for G++.
- . should it do something to generate shared libraries objects ?
-
-I have tested this code on the following processor/os. gcc-1.37.1 was
- used for all the tests.
-
-386 SCO unix ODT
- gcc-1.37.1, gas, emacs-18.55
-
-386 Esix rev C
- gas-1.37/write.s
-
-386 Ix 2.02
- gas, all the X11R4 mit clients
-
-386 CTIX 3.2
- xsol (X11R4 solitary game), gas
-
-68030 unisoft 1.3
- the kernel (V.3.2) + tcp/ip extensions
- bash-1.05, bison-1.11, compress-4.0, cproto, shar-3.49, diff-1.14,
- dist-18.55, flex-2.3, gas-1.37, gcc-1.37.1, gdb-3.6, grep-1.5,
- kermit, make-3.58, makedep, patch, printf, makeinfo, g++-1.37.1,
- tar-1.08, texi2roff, uuencode, uutraf-1.2, libg++-1.37.2, groff-0.5
-
-68020 sunos 3.5 (no, not coff, just to be sure that I didn't
- introduce errors)
- gcc-1.37.1, gas, emacs-18.55, gdb-3.6, bison-1.11, diff-1.14,
- make-3.58, tar-1.08
-
-68030 sunos 4.0.3 (idem)
- gas
-
-I would be glad to hear about new experiences
-
- Loic (loic@adesign.uucp or loic@afp.uucp)
-