Bug 121775

Description of problem:
Problem Statement:

The compiler gcc-c++-2.96-124.7.2 is producing incorrect code for the 
source contained within test.cc through not restoring the global 
pointer after a call to memcpy.

A call to memcpy is made in libc.  The global pointer is set to the 
correct value to point at the center of the static/global short data 
section for that shared object.  When the call returns it attempts to 
do a offset from the global pointer for a load and crashes because it 
has returned to the test executable where the stale global pointer is 
not longer valid.

br.call.sptk.many b0 = memcpy#  // Call to memcpy
	;;
[.LBE3:]
	addl r15 = @gprel(_.tmp_0.13#), gp 	//gp rel addr. used 
						//Before gp restored
	;;
	st4 [r15] = r118			//Crash occurs here 
	.loc 1 58 0
	br .L2
.L6:


Version-Release number of selected component (if applicable):
gcc-c++-2.96-124.7.2 

How reproducible:
Everytime

Steps to Reproduce:
1. run make on example provided
2. make test.s to view the issue in the assembly
3.
  
Actual results:
Segmentation violation

Expected results:
Global pointer should be restored.

Additional info:

Questions:
Please contact:
Michael Chynoweth
e-mail:  michael.w.chynoweth
Phone:  (505) 893-1255