* mips-tdep.c (mips_gdbarch_init): Use Tag_GNU_MIPS_ABI_FP to

[deliverable/binutils-gdb.git] / gdb / sparcnbsd-tdep.c

diff --git a/gdb/sparcnbsd-tdep.c b/gdb/sparcnbsd-tdep.c
index 6862bdce3c308f70a63c8d3bd111e6d4b326e20f..d9093b132505a738e2411b69c31166f0120bcadf 100644 (file)
--- a/gdb/sparcnbsd-tdep.c
+++ b/gdb/sparcnbsd-tdep.c
@@ -1,6 +1,6 @@
 /* Target-dependent code for NetBSD/sparc.
 
-   Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
    Contributed by Wasabi Systems, Inc.
 
    This file is part of GDB.
@@ -21,10 +21,10 @@
    Boston, MA 02110-1301, USA.  */
 
 #include "defs.h"
-#include "floatformat.h"
 #include "frame.h"
 #include "frame-unwind.h"
 #include "gdbcore.h"
+#include "gdbtypes.h"
 #include "osabi.h"
 #include "regcache.h"
 #include "regset.h"
@@ -38,6 +38,11 @@
 #include "sparc-tdep.h"
 #include "nbsd-tdep.h"
 
+/* Macros to extract fields from SPARC instructions.  */
+#define X_RS1(i) (((i) >> 14) & 0x1f)
+#define X_RS2(i) ((i) & 0x1f)
+#define X_I(i) (((i) >> 13) & 1)
+
 const struct sparc_gregset sparc32nbsd_gregset =
 {
   0 * 4,                       /* %psr */
@@ -256,6 +261,27 @@ sparc32nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
   return NULL;
 }
 \f
+/* Return the address of a system call's alternative return
+   address.  */
+
+CORE_ADDR
+sparcnbsd_step_trap (struct frame_info *frame, unsigned long insn)
+{
+  if ((X_I (insn) == 0 && X_RS1 (insn) == 0 && X_RS2 (insn) == 0)
+      || (X_I (insn) == 1 && X_RS1 (insn) == 0 && (insn & 0x7f) == 0))
+    {
+      /* "New" system call.  */
+      ULONGEST number = get_frame_register_unsigned (frame, SPARC_G1_REGNUM);
+
+      if (number & 0x400)
+       return get_frame_register_unsigned (frame, SPARC_G2_REGNUM);
+      if (number & 0x800)
+       return get_frame_register_unsigned (frame, SPARC_G7_REGNUM);
+    }
+
+  return 0;
+}
+\f
 
 static void
 sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
@@ -264,7 +290,7 @@ sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   /* NetBSD doesn't support the 128-bit `long double' from the psABI.  */
   set_gdbarch_long_double_bit (gdbarch, 64);
-  set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
+  set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
 
   tdep->gregset = regset_alloc (gdbarch, sparc32nbsd_supply_gregset, NULL);
   tdep->sizeof_gregset = 20 * 4;
@@ -272,6 +298,9 @@ sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->fpregset = regset_alloc (gdbarch, sparc32nbsd_supply_fpregset, NULL);
   tdep->sizeof_fpregset = 33 * 4;
 
+  /* Make sure we can single-step "new" syscalls.  */
+  tdep->step_trap = sparcnbsd_step_trap;
+
   frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer);
 }