ppc64: Handle short vectors as function return types

Short synthetic vector types (i.e. those defined using GCC's
attribute ((vector_size)) instead of AltiVec vector types)
are returned in r3.  Fix ppc64_sysv_abi_return_value to
correctly handle this.

gdb/ChangeLog:

	* ppc-sysv-tdep.c (ppc64_sysv_abi_return_value_base): Handle short
	synthetic (non-AltiVec) vector types.
	(ppc64_sysv_abi_return_value): Likewise.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index f22f11fc2876236c3aee3f1e7da1e9cecca58229..509dae398239bafacc6cd3c44acff749293e1c16 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2015-05-12 Ulrich Weigand  <uweigand@de.ibm.com>
+
+       * ppc-sysv-tdep.c (ppc64_sysv_abi_return_value_base): Handle short
+       synthetic (non-AltiVec) vector types.
+       (ppc64_sysv_abi_return_value): Likewise.
+
 2015-06-12  Antoine Tremblay  <antoine.tremblay@ericsson.com>
 
        PR breakpoints/16465

diff --git a/gdb/ppc-sysv-tdep.c b/gdb/ppc-sysv-tdep.c
index 6487bec906bdf640184d59438836531286a92b47..ea98c6ebed5f2573542304e2eb76c8c415c75d2a 100644 (file)
--- a/gdb/ppc-sysv-tdep.c
+++ b/gdb/ppc-sysv-tdep.c
@@ -1892,7 +1892,8 @@ ppc64_sysv_abi_return_value_base (struct gdbarch *gdbarch, struct type *valtype,
     }
 
   /* AltiVec vectors are returned in VRs starting at v2.  */
-  if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype)
+  if (TYPE_LENGTH (valtype) == 16
+      && TYPE_CODE (valtype) == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype)
       && tdep->vector_abi == POWERPC_VEC_ALTIVEC)
     {
       int regnum = tdep->ppc_vr0_regnum + 2 + index;
@@ -1904,6 +1905,25 @@ ppc64_sysv_abi_return_value_base (struct gdbarch *gdbarch, struct type *valtype,
       return 1;
     }
 
+  /* Short vectors are returned in GPRs starting at r3.  */
+  if (TYPE_LENGTH (valtype) <= 8
+      && TYPE_CODE (valtype) == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype))
+    {
+      int regnum = tdep->ppc_gp0_regnum + 3 + index;
+      int offset = 0;
+
+      if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
+       offset = 8 - TYPE_LENGTH (valtype);
+
+      if (writebuf != NULL)
+       regcache_cooked_write_part (regcache, regnum,
+                                   offset, TYPE_LENGTH (valtype), writebuf);
+      if (readbuf != NULL)
+       regcache_cooked_read_part (regcache, regnum,
+                                  offset, TYPE_LENGTH (valtype), readbuf);
+      return 1;
+    }
+
   return 0;
 }
 
@@ -1993,6 +2013,7 @@ ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct value *function,
 
   /* Small character arrays are returned, right justified, in r3.  */
   if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY
+      && !TYPE_VECTOR (valtype)
       && TYPE_LENGTH (valtype) <= 8
       && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT
       && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1)
@@ -2012,7 +2033,13 @@ ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct value *function,
   /* In the ELFv2 ABI, homogeneous floating-point or vector
      aggregates are returned in registers.  */
   if (tdep->elf_abi == POWERPC_ELF_V2
-      && ppc64_elfv2_abi_homogeneous_aggregate (valtype, &eltype, &nelt))
+      && ppc64_elfv2_abi_homogeneous_aggregate (valtype, &eltype, &nelt)
+      && (TYPE_CODE (eltype) == TYPE_CODE_FLT
+         || TYPE_CODE (eltype) == TYPE_CODE_DECFLOAT
+         || (TYPE_CODE (eltype) == TYPE_CODE_ARRAY
+             && TYPE_VECTOR (eltype)
+             && tdep->vector_abi == POWERPC_VEC_ALTIVEC
+             && TYPE_LENGTH (eltype) == 16)))
     {
       for (i = 0; i < nelt; i++)
        {