diff -up gdb-6.8/gdb/sparc64-linux-tdep.c.sparc gdb-6.8/gdb/sparc64-linux-tdep.c
--- gdb-6.8/gdb/sparc64-linux-tdep.c.sparc	2008-01-01 16:53:13.000000000 -0600
+++ gdb-6.8/gdb/sparc64-linux-tdep.c	2008-05-15 14:08:57.000000000 -0500
@@ -174,6 +174,30 @@ sparc64_linux_collect_core_fpregset (con
   sparc64_collect_fpregset (regcache, regnum, fpregs);
 }
 
+/* Set the program counter for process PTID to PC.  */
+
+static void
+sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+  ULONGEST state;
+
+  regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
+  regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4);
+
+  /* Clear the "in syscall" bit to prevent the kernel from
+     messing with the PCs we just installed, if we happen to be
+     within an interrupted system call that the kernel wants to
+     restart.
+
+     Note that after we return from the dummy call, the TSTATE et al.
+     registers will be automatically restored, and the kernel
+     continues to restart the system call at this point.  */
+  regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state);
+  state &= ~((ULONGEST)0x20);
+  regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state);
+}
+
 
 
 static void
@@ -211,6 +235,8 @@ sparc64_linux_init_abi (struct gdbarch_i
 
   /* Make sure we can single-step over signal return system calls.  */
   tdep->step_trap = sparc64_linux_step_trap;
+
+  set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc);
 }
 
 
diff -up gdb-6.8/gdb/sparc-linux-tdep.c.sparc gdb-6.8/gdb/sparc-linux-tdep.c
--- gdb-6.8/gdb/sparc-linux-tdep.c.sparc	2008-01-01 16:53:13.000000000 -0600
+++ gdb-6.8/gdb/sparc-linux-tdep.c	2008-05-15 14:08:12.000000000 -0500
@@ -211,6 +211,30 @@ sparc32_linux_collect_core_fpregset (con
   sparc32_collect_fpregset (regcache, regnum, fpregs);
 }
 
+/* Set the program counter for process PTID to PC.  */
+
+static void
+sparc_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+  ULONGEST psr;
+
+  regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
+  regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4);
+
+  /* Clear the "in syscall" bit to prevent the kernel from
+     messing with the PCs we just installed, if we happen to be
+     within an interrupted system call that the kernel wants to
+     restart.
+
+     Note that after we return from the dummy call, the PSR et al.
+     registers will be automatically restored, and the kernel
+     continues to restart the system call at this point.  */
+  regcache_cooked_read_unsigned (regcache, SPARC32_PSR_REGNUM, &psr);
+  psr &= ~0x000004000;
+  regcache_cooked_write_unsigned (regcache, SPARC32_PSR_REGNUM, psr);
+}
+
 
 
 static void
@@ -238,10 +262,6 @@ sparc32_linux_init_abi (struct gdbarch_i
      prologue analysis.  */
   tdep->plt_entry_size = 12;
 
-  /* GNU/Linux doesn't support the 128-bit `long double' from the psABI.  */
-  set_gdbarch_long_double_bit (gdbarch, 64);
-  set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
-
   /* Enable TLS support.  */
   set_gdbarch_fetch_tls_load_module_address (gdbarch,
                                              svr4_fetch_objfile_link_map);
@@ -251,6 +271,8 @@ sparc32_linux_init_abi (struct gdbarch_i
 
   /* Hook in the DWARF CFI frame unwinder.  */
   frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
+
+  set_gdbarch_write_pc (gdbarch, sparc_linux_write_pc);
 }
 
 /* Provide a prototype to silence -Wmissing-prototypes.  */