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Subject: Re: cvs commit: src/lib/libc/gmon gmon.c src/lib/libc/i386 DEFS.h 
 SYS.h src/lib/libc/i386/gen modf.S setjmp.S sigsetjmp.S 
 src/lib/libc/i386/sys Ovfork.S brk.S cerror.S exect.S fork.S pipe.S 
 ptrace.S rfork.S sbrk.S setlogin.S sigpending.S sigprocmask.S sigreturn.S 
 sigsuspend.S syscall.S 
In-reply-to: Your message of "Sun, 05 May 1996 00:56:25 MST."
             <199605050756.AAA14309@freefall.freebsd.org> 
Date: Sun, 05 May 1996 16:11:34 +0800
From: Peter Wemm <peter@spinner.DIALix.COM>
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>peter       96/05/05 00:56:25
>
>  Modified:    lib/libc/gmon  gmon.c
>               lib/libc/i386  DEFS.h SYS.h
>               lib/libc/i386/gen  modf.S setjmp.S sigsetjmp.S
>               lib/libc/i386/sys  Ovfork.S brk.S cerror.S exect.S fork.S
>                        pipe.S ptrace.S rfork.S  sbrk.S setlogin.S
>                        sigpending.S sigprocmask.S sigreturn.S 
>                        sigsuspend.S syscall.S
>  Log:
>  Add support to enable libc to be compiled in ELF format. (#ifdef __ELF__)
>  In a nutshell, this macroizes the local/global symbol scoping rules
>  that are different in a.out and ELF.  It also makes the i386 assembler
>  stubs conform to i386 PIC calling conventions - the a.out ld.so didn't
>  object, but the ELF one needs it as it implements PIC jumps via PLT's as
>  well as calls.  The a.out rtld only worked because it was accidently
>  snooping the grandparent calling function's return address off the stack..
>  
>  This also affects the libc_r code a little, because of cpp macro nesting.

Aargh! how could I forget to credit a commit again! :-(

This is based on John Polstra's work for 2.1R, I've adapted it and tweaked 
it for -current.

Reviewed by: jdp, bde

-Peter