🚀 go-pugleaf

We recently upgraded some of our computers to Solaris2.5, and suddenly
our gcc compiled gnudiff couldn't handle directories any more.

Here is a explanation what I beleives is the reason:

A deap investigation shows that Sun has changed the behavior of _init() in 
libc.so in a way that it destroys the functions .mul .umul .div .udiv (which 
by some strange reason they have placed in the data area of libc.so).
Programs compiled with SunSofts SparcCompiler includes a dummy _init function 
that does nothing, but programs kompiled with gcc uses the version from 
libc.so and is therefore affected by this change in libc in a very bad way.

I am pretty shure about this, but please verify.

I have this problem open with SunService here in Sweden, and I am currently
waiting for a response to this from them.

_init(), as compiled into SC3.0.1 compiled programs, or in 2.4 libc.so:
<_init>:        save  %sp, -96, %sp
<_init+4>:      ret 
<_init+8>:      restore 

Solaris 2.5 _init()
<_init>:     save  %sp, -96, %sp
<_init+4>:   call  <__urem64+772>
<_init+8>:   nop 
<_init+12>:  call  <_PROCEDURE_LINKAGE_TABLE_+7152>
<_init+16>:  nop 
<_init+20>:  ret 
<_init+24>:  restore 

And it it probably the call to __urem64+772 that kills the .mul... functions.


.mul... before the call to _init: (or with dummy init)
<..mul>:        smul  %o0, %o1, %o0
<.mul+4>:       rd  %y, %o1
<.mul+8>:       sra  %o0, 0x1f, %o2
<.mul+12>:      retl 
<.mul+16>:      cmp  %o1, %o2
<.mul+20>:      sra  %o0, 0x1f, %o2
<.mul+24>:      retl 
<.mul+28>:      cmp  %o1, %o2
 
<..umul>:       umul  %o0, %o1, %o0
<.umul+4>:      rd  %y, %o1
<.umul+8>:      retl 
<.umul+12>:     tst  %o1
<.umul+16>:     rd  %y, %o1
<.umul+20>:     retl 
<.umul+24>:     tst  %o1
 
<.div>:         sra  %o0, 0x1f, %o2
<.div+4>:       wr  %g0, %o2, %y
<.div+8>:       nop 
<.div+12>:      nop 
<.div+16>:      nop 
<.div+20>:      sdivcc  %o0, %o1, %o0
<.div+24>:      bvs,a   <.div+32>
<.div+28>:      xnor  %o0, %g0, %o0
<.div+32>:      retl 
<.div+36>:      nop 
<.div+40>:      xnor  %o0, %g0, %o0
<.div+44>:      retl 
<.div+48>:      nop 
 
<..udiv>:       mov  %g0, %y
<.udiv+4>:      nop 
<.udiv+8>:      nop 
<.udiv+12>:     retl 
<.udiv+16>:     udiv  %o0, %o1, %o0
<.udiv+20>:     nop 
<.udiv+24>:     retl 
<.udiv+28>:     udiv  %o0, %o1, %o0
 
<.rem>:         sra  %o0, 0x1f, %o4
<..rem+4>:      mov  %o4, %y
<..rem+8>:      nop 
<..rem+12>:     nop 
<..rem+16>:     nop 
<..rem+20>:     sdivcc  %o0, %o1, %o2
<..rem+24>:     bvs,a   <..rem+32>
<..rem+28>:     xnor  %o2, %g0, %o2
<..rem+32>:     smul  %o2, %o1, %o2
<..rem+36>:     retl 
<..rem+40>:     sub  %o0, %o2, %o0
<..rem+44>:     smul  %o2, %o1, %o2
<..rem+48>:     retl 
<..rem+52>:     sub  %o0, %o2, %o0
 
<..urem>:       mov  %g0, %y
<..urem+4>:     nop 
<..urem+8>:     nop 
<..urem+12>:    nop 
<..urem+16>:    udiv  %o0, %o1, %o2
<..urem+20>:    umul  %o2, %o1, %o2
<..urem+24>:    retl 
<..urem+28>:    sub  %o0, %o2, %o0
<..urem+32>:    umul  %o2, %o1, %o2
<..urem+36>:    retl 
<..urem+40>:    sub  %o0, %o2, %o0

.mul... after cal to _init:
<..mul>:        retl 
<.mul+4>:       cmp  %o1, %o2
<.mul+8>:       sra  %o0, 0x1f, %o2
<.mul+12>:      retl 
<.mul+16>:      cmp  %o1, %o2
<.mul+20>:      sra  %o0, 0x1f, %o2
<.mul+24>:      retl 
<.mul+28>:      cmp  %o1, %o2
 
<..umul>:       tst  %o1
<.umul+4>:      rd  %y, %o1
<.umul+8>:      retl 
<.umul+12>:     tst  %o1
<.umul+16>:     rd  %y, %o1
<.umul+20>:     retl 
<.umul+24>:     tst  %o1
 
<.div>:         nop 
<.div+4>:       nop 
<.div+8>:       sdivcc  %o0, %o1, %o0
<.div+12>:      bvs,a   <.div+20>
<.div+16>:      xnor  %o0, %g0, %o0
<.div+20>:      retl 
<.div+24>:      nop 
<.div+28>:      xnor  %o0, %g0, %o0
<.div+32>:      retl 
<.div+36>:      nop 
<.div+40>:      xnor  %o0, %g0, %o0
<.div+44>:      retl 
<.div+48>:      nop 
 
<..udiv>:       retl 
<.udiv+4>:      udiv  %o0, %o1, %o0
<.udiv+8>:      nop 
<.udiv+12>:     retl 
<.udiv+16>:     udiv  %o0, %o1, %o0
<.udiv+20>:     nop 
<.udiv+24>:     retl 
<.udiv+28>:     udiv  %o0, %o1, %o0
 
<.rem>:         nop 
<..rem+4>:      nop 
<..rem+8>:      sdivcc  %o0, %o1, %o2
<..rem+12>:     bvs,a   <..rem+20>
<..rem+16>:     xnor  %o2, %g0, %o2
<..rem+20>:     smul  %o2, %o1, %o2
<..rem+24>:     retl 
<..rem+28>:     sub  %o0, %o2, %o0
<..rem+32>:     smul  %o2, %o1, %o2
<..rem+36>:     retl 
<..rem+40>:     sub  %o0, %o2, %o0
<..rem+44>:     smul  %o2, %o1, %o2
<..rem+48>:     retl 
<..rem+52>:     sub  %o0, %o2, %o0
 
<..urem>:       nop 
<..urem+4>:     udiv  %o0, %o1, %o2
<..urem+8>:     umul  %o2, %o1, %o2
<..urem+12>:    retl 
<..urem+16>:    sub  %o0, %o2, %o0
<..urem+20>:    umul  %o2, %o1, %o2
<..urem+24>:    retl 
<..urem+28>:    sub  %o0, %o2, %o0
<..urem+32>:    umul  %o2, %o1, %o2
<..urem+36>:    retl 
<..urem+40>:    sub  %o0, %o2, %o0

---
Henrik Nordstrvm
University of Skoevde
Sweden