[Bug ports/7001] New: setjmp/longjmp do not save/restore correct FPU registers in N32 ABI mode

["n-redhat-glibc at nsd dot dyndns dot org" <sourceware-bugzilla at sourceware dot org>]

In the files

  glibc/ports/sysdeps/mips/mips64/setjmp_aux.c
  glibc/ports/sysdeps/mips/mips64/__longjmp.c

the innermost #if checks look like this:

  #if _MIPS_SIM == _ABI64
     [ save/restore f24, f25, ... f31 ]
  #else
     [ save/restore f20,, f22, ... f30 ] (Even registers only b/c on 32-bit CPUs
the registers are paired even/odd to hold double precision FP numbers)
  #endif

Thus in _ABIN32 (64-bit CPU using 32-bit pointers) the 32-bit CPU code is
selected, which fails to save or restore any odd numbered registers. The N32 ABI
defines f24-f31 as callee-saved, same as _ABI64 does.

One fix would be to change the tests from

-  #if _MIPS_SIM == _ABI64
+  #if _MIPS_SIM != _ABIO32

This is present in at least glibc-ports-2.7 (where we discovered it), 2.8 and in
CVS HEAD.


-Nicolas Dade

-- 
           Summary: setjmp/longjmp do not save/restore correct FPU registers
                    in N32 ABI mode
           Product: glibc
           Version: 2.8
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ports
        AssignedTo: roland at gnu dot org
        ReportedBy: n-redhat-glibc at nsd dot dyndns dot org
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: i686-unknown-linux-gnu
  GCC host triplet: mips64-unknown-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=7001

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