[Bug tdep/34434] [gdb/tdep] Make ppc less dependent on user area layout constants

https://sourceware.org/bugzilla/show_bug.cgi?id=34434

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Tentative patch:
...
diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c
index 413e0e0ab97..b00fa4e48f8 100644
--- a/gdb/ppc-linux-nat.c
+++ b/gdb/ppc-linux-nat.c
@@ -905,6 +905,8 @@ check_regset (int tid, int regset_id, int regsetsize)
     return false;
 }

+static void fetch_fp_regs (struct regcache *regcache, int tid);
+
 static void
 fetch_register (struct regcache *regcache, int tid, int regno)
 {
@@ -1064,6 +1066,13 @@ fetch_register (struct regcache *regcache, int tid, int
regno)
                    &ppc32_linux_ctarregset);
       return;
     }
+  else if (tdep->ppc_fp0_regnum >= 0
+          && regno >= tdep->ppc_fp0_regnum
+          && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
+    {
+      fetch_fp_regs (regcache, tid);
+      return;
+    }

   if (regaddr == -1)
     {
@@ -1470,6 +1479,8 @@ store_spe_register (const struct regcache *regcache, int
tid, int regno)
   set_spe_registers (tid, &evrregs);
 }

+static void store_fp_regs (const struct regcache *regcache, int tid, int
regno);
+
 static void
 store_register (const struct regcache *regcache, int tid, int regno)
 {
@@ -1617,6 +1628,13 @@ store_register (const struct regcache *regcache, int
tid, int regno)
                    &ppc32_linux_ctarregset);
       return;
     }
+  else if (tdep->ppc_fp0_regnum >= 0
+          && regno >= tdep->ppc_fp0_regnum
+          && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
+    {
+      store_fp_regs (regcache, tid, regno);
+      return;
+    }

   if (regaddr == -1)
     return;
...

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