diff options
Diffstat (limited to 'gas')
| -rw-r--r-- | gas/.Sanitize | 3 | ||||
| -rw-r--r-- | gas/ChangeLog | 1 | ||||
| -rw-r--r-- | gas/NOTES | 47 | ||||
| -rw-r--r-- | gas/NOTES.config | 28 | ||||
| -rw-r--r-- | gas/README-quirks | 7 | ||||
| -rw-r--r-- | gas/README.coff | 79 | ||||
| -rw-r--r-- | gas/README.rich | 143 |
7 files changed, 15 insertions, 293 deletions
diff --git a/gas/.Sanitize b/gas/.Sanitize index 17cc3e9..4df4e45 100644 --- a/gas/.Sanitize +++ b/gas/.Sanitize @@ -32,10 +32,7 @@ NEWS NOTES NOTES.config README -README-quirks README-vms -README.coff -README.rich acconfig.h aclocal.m4 app.c diff --git a/gas/ChangeLog b/gas/ChangeLog index 3e92aae..b0dc114 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1487,7 +1487,6 @@ Mon Dec 11 16:23:51 1995 Stan Shebs <shebs@andros.cygnus.com> * mac-as.r: Fix copyright and version strings. (cfrg): Use PROG_NAME instead of literal name. - Mon Dec 11 14:14:08 1995 Ian Lance Taylor <ian@cygnus.com> * read.c (read_a_source_file): If tc_unrecognized_line is defined, @@ -5,23 +5,16 @@ PORTING: Sorry, no description of the interfaces is written up yet. Look at existing back ends and work from there. -New hosts: If your host system has a strange header file setup, create a -config/ho-foo.h file for it and include the appropriate header files or -definitions there. If your host has a broken compiler, or some broken macros -in header files, create a host-specific file and repair the damage there. -(See, for example, ho-rs6000.h. The "assert" macro on that system doesn't work -right, and a flag is set to rewrite an expression in tc-m68k.c that the native -compiler mis-compiles.) - -New target formats: Look at the BFD_ASSEMBLER code. The a.out code might be a -fair example. There are no "good" examples yet, unfortunately, nor any good -documentation of the changes. +New hosts: The configure script, which is generated by autoconf, +should handle all host specific configuration. + +New target formats: Look at the BFD_ASSEMBLER code. The a.out or ELF +code might be a fair example. There are no "good" examples yet, +unfortunately, nor any good documentation of the changes. New target processors: Check first to see if the BFD_ASSEMBLER interface is supported by the file format code you need to use. -New environments: ??? - DOCUMENTATION: The internals of gas need documenting. @@ -45,10 +38,6 @@ non-BFD_ASSEMBLER version often has multiple conditional tests inside it for various processors or formats. As the various targets get converted over, these will gradually go away. -As of the moment I'm editing this file, only the "sun4" and "decstation-bsd" -targets can really use the BFD code. Other back ends still need merging or -touching up. - TO DO: Remove DONTDEF code, commented-out code. @@ -105,30 +94,6 @@ Torbjorn Granlund <tege@cygnus.com> writes, regarding alpha .align: since these two instructions can dual-issue. Since .align is ued a lot by gcc, it is an important optimization. -Torbjorn Granlund <tege@cygnus.com> writes, regarding i386/i486/pentium: - - In a new publication from Intel, "Optimization for Intel's 32 bit - Processors", they recommended code alignment on a 16 byte boundary if that - requires less than 8 bytes of fill instructions. The Pentium is not - affected by such alignment, the 386 wants alignment on a 4 byte boundary. - It is the 486 that is most helped by large alignment. - - Recommended nop instructions: - 1 byte: 90 xchg %eax,%eax - 2 bytes: 8b c0 movl %eax,%eax - 3 bytes: 8d 76 00 leal 0(%esi),%esi - 4 bytes: 8d 74 26 00 leal 0(%esi),%esi - 5 bytes: 8b c0 8d 76 00 movl %eax,%eax; leal 0(%esi),%esi - 6 bytes: 8d b6 00 00 00 00 leal 0(%esi),%esi - 7 bytes: 8d b4 26 00 00 00 00 leal 0(%esi),%esi - - Note that `leal 0(%esi),%esi' has a few different encodings... - - There are faster instructions for certain lengths, that are not true nops. - If you can determine that a register and the condition code is dead (by - scanning forwards for a register that is written before it is read, and - similar for cc) you can use a `incl reg' for a 3 times faster 1 cycle nop... - (From old "NOTES" file to-do list, not really reviewed:) fix relocation types for i860, perhaps by adding a ref pointer to fixS? diff --git a/gas/NOTES.config b/gas/NOTES.config index e12797d..79832e6 100644 --- a/gas/NOTES.config +++ b/gas/NOTES.config @@ -3,30 +3,20 @@ Theory: -The goal of the new configuration scheme is to bury all object format, -target processor, and host machine dependancies in object, target, and -host specific files. That is, to move all #ifdef's out of the gas -common code. +The goal of the new configuration scheme is to bury all object format +and target processor dependancies in object and target specific files. +That is, to move all #ifdef's out of the gas common code. Here's how it works. There is a .h and a .c file for each object file -format, a .h and a .c file for each target processor, and a .h for -each host. config.gas creates {sym}links in the current directory to -the appropriate files in the config directory. config.gas also serves -as a list of triplets {host, target, object-format} that have been -tested at one time or another. I also recommend that config.gas be -used to document triplet specific notes as to purpose of the triplet, -etc. +format and a .h and a .c file for each target processor. The +configure script creates symlinks in the current directory to the +appropriate files in the config directory. configure also serves as a +list of triplets {host, target, object-format} that have been tested +at one time or another. I also recommend that configure be used to +document triplet specific notes as to purpose of the triplet, etc. Implementation: -host.h is a {sym}link to .../config/xm-yourhost.h. It is intended to -be used to hide host compiler, system header file, and system library -differences between host machines. If your host needs actual c source -files, then either: these are generally useful functions, in which -case you should probably build a local library outside of the gas -source tree, or someone, perhaps me, is confused about what is needed -by different hosts. - obj-format.h is a {sym}link to .../config/obj-something.h. It is intended All gas .c files include as.h. diff --git a/gas/README-quirks b/gas/README-quirks deleted file mode 100644 index c9a3b05..0000000 --- a/gas/README-quirks +++ /dev/null @@ -1,7 +0,0 @@ -* rcsid's should be conspicuously absent until someone explains to me - how to use them constructively without affecting diffs from remote - sites. If you can, then I will become an active supporter of - rcsid's. - -* "diff -u" patches preferred. "diff -c" patches accepted. All other - patches will be returned. diff --git a/gas/README.coff b/gas/README.coff deleted file mode 100644 index 46c61cd..0000000 --- a/gas/README.coff +++ /dev/null @@ -1,79 +0,0 @@ -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) - diff --git a/gas/README.rich b/gas/README.rich deleted file mode 100644 index 1ac53c7..0000000 --- a/gas/README.rich +++ /dev/null @@ -1,143 +0,0 @@ - - - The Code Pedigree of This Directory - - -This directory contains a big merge of several development lines of -gas as well as a few bug fixes and some configuration that I've added -in order to retain my own sanity. - -A little history. - -The only common baseline of all versions was gas-1.31. - -From 1.31, Intel branched off and added: - - support for the Intel 80960 (i960) processor. - support for b.out object files. - some bug fixes. - sloppy mac MPW support - Intel gnu/960 makefiles and version numbering. - -Many of the bug fixes found their way into the main development line -prior to 1.36. ALL intel changes were ifdef'd I80960. This was good -as it isolated the changes, but bad in that it connected the b.out -support to the i960 support, and bad in that the bug fixes were only -active in the i960+b.out executables of gas, (although most of these -were nicely marked with comments indicating that they were probably -general bug fixes.) - -To pick up the main FSF development line again, along the way to 1.36, -several new processors were added, many bugs fixed, and the world was -a somewhat better place in general. - -From gas-1.36, Loic at Axis Design (france!) encapsulated object -format specific actions, added coff versions of those encapsulations, -and a config.gas style configuration and Makefile. This was a big -change and a lot of work. - -Then along came the FIRST FSF release of gas-1.37. I say this because -there have been at least two releases of gas-1.37. Only two of them -do we care about for this story, so let's call them gas-1.37.1 and -gas-1.37.2. - -Here starts the confusion. Firstly, gas-1.37.1 did not compile. - -In the meantime, John Gilmore at Cygnus Support had been hacking -gas-1.37.1. He got it to compile. He added support for the AMD 29000 -processor. AND he started encapsulating some of the a.out specific -pieces of code mostly into functions. AND he rebuilt the relocation -info to be generic. AND he restructured somewhat so that for a single -host, cross assemblers could be built for all targets in the same -directory. Useful work but a considerable nuisance because the a29k -changes were not partitioned from the encapsulation changes, the -encapsulation changes were incomplete, and the encapsulation required -functions where alternate structuring might have used macros. Let's -call this version gas-1.37.1+a29k. - -By the time gas-1.37.2 was "released", (remember that it TOO was -labelled by FSF as gas-1.37), it compiled, but it also added i860 -support and ansi style const declarations. - -At this point, Loic rolled his changes into gas-1.37.2. - -What I've done. - -I collected all the stray versions of gas that sounded relevant to my -goals of cross assembly and alternate object file formats and the FSF -releases from which the stray versions had branched. - -I rolled the Intel i960 changes from 1.31 into versions that I call -1.34+i960, 1.36+i960, and then 1.37.1+i960. - -Then I merged 1.37.1+i960 with 1.37.1+a29k to produce what I call -1.37.1+i960+a29k or 1.37.3. - -From 1.37.3, I pulled in Loic's stuff. This wasn't easy as Loic's -stuff hit all the same points as John's encapsulations. Loic's goal -was to split the a.out from coff dependancies for native assembly on -coff, while John's was to split for multiple cross assembly from a -single host. - -Loic's config arranged files much like emacs into m-*, etc. I've -rearranged these somewhat. - -Theory: - -The goal of the new configuration scheme is to bury all object format, -target processor, and host machine dependancies in object, target, and -host specific files. That is, to move all #ifdef's out of the gas -common code. - -Here's how it works. There is a .h and a .c file for each object file -format, a .h and a .c file for each target processor, and a .h for -each host. config.gas creates {sym}links in the current directory to -the appropriate files in the config directory. config.gas also serves -as a list of triplets {host, target, object-format} that have been -tested at one time or another. I also recommend that config.gas be -used to document triplet specific notes as to purpose of the triplet, -etc. - -Implementation: - -host.h is a {sym}link to .../config/xm-yourhost.h. It is intended to -be used to hide host compiler, system header file, and system library -differences between host machines. If your host needs actual c source -files, then either: these are generally useful functions, in which -case you should probably build a local library outside of the gas -source tree, or someone, perhaps me, is confused about what is needed -by different hosts. - -obj-format.h is a {sym}link to .../config/obj-something.h. It is intended - -All gas .c files include as.h. - -as.h #define's "gas", includes host.h, defines a number of gas -specific structures and types, and then includes tp.h, obj.h, and -target-environment.h. - -target-environment.h defines a target environment specific -preprocessor flag, eg, TE_SUN, and then includes obj-format.h. - -obj-format.h defines an object format specific preprocessor flag, eg, -OBJ_AOUT, OBJ_BOUT, OBJ_COFF, includes "target-processor.h", and then -defines the object specific macros, functions, types, and structures. - -target-processor.h - -target-processor. - -Porting: - -There appear to be four major types of ports; new hosts, new target -processors, new object file formats, and new target environments. - - ------ - -reloc now stored internally as generic. (symbols too?) (segment types -vs. names?) - -I don't mean to overlook anyone here. There have also been several -other development lines here that I looked at and elected to bypass. -Specifically, xxx's stabs in coff stuff was particularly tempting. |