* gdb.texinfo (Help): Fix formatting of examples.

[deliverable/binutils-gdb.git] / gdb / sparc-linux-tdep.c

diff --git a/gdb/sparc-linux-tdep.c b/gdb/sparc-linux-tdep.c
index 328889b4c8ee9395dd50e691a8ad337050f69f59..a6a8a276f87ad04e52d2c50672f3e9b770d3060d 100644 (file)
--- a/gdb/sparc-linux-tdep.c
+++ b/gdb/sparc-linux-tdep.c
@@ -1,6 +1,6 @@
 /* Target-dependent code for GNU/Linux SPARC.
 
-   Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -20,9 +20,11 @@
    Boston, MA 02110-1301, USA.  */
 
 #include "defs.h"
-#include "floatformat.h"
+#include "dwarf2-frame.h"
 #include "frame.h"
 #include "frame-unwind.h"
+#include "gdbtypes.h"
+#include "regset.h"
 #include "gdbarch.h"
 #include "gdbcore.h"
 #include "osabi.h"
@@ -124,6 +126,97 @@ sparc32_linux_sigframe_init (const struct tramp_frame *self,
     }
   trad_frame_set_id (this_cache, frame_id_build (base, func));
 }
+\f
+/* Return the address of a system call's alternative return
+   address.  */
+
+static CORE_ADDR
+sparc32_linux_step_trap (unsigned long insn)
+{
+  if (insn == 0x91d02010)
+    {
+      ULONGEST sc_num;
+
+      regcache_cooked_read_unsigned (current_regcache,
+                                    SPARC_G1_REGNUM, &sc_num);
+
+      /* __NR_rt_sigreturn is 101 and __NR_sigreturn is 216  */
+      if (sc_num == 101 || sc_num == 216)
+       {
+         ULONGEST sp, pc_offset;
+
+         regcache_cooked_read_unsigned (current_regcache,
+                                        SPARC_SP_REGNUM, &sp);
+
+         /* The kernel puts the sigreturn registers on the stack,
+            and this is where the signal unwinding state is take from
+            when returning from a signal.
+
+            For __NR_sigreturn, this register area sits 96 bytes from
+            the base of the stack.  The saved PC sits 4 bytes into the
+            sigreturn register save area.
+
+            For __NR_rt_sigreturn a siginfo_t, which is 128 bytes, sits
+            right before the sigreturn register save area.  */
+
+         pc_offset = 96 + 4;
+         if (sc_num == 101)
+           pc_offset += 128;
+
+         return read_memory_unsigned_integer (sp + pc_offset, 4);
+       }
+    }
+
+  return 0;
+}
+\f
+
+const struct sparc_gregset sparc32_linux_core_gregset =
+{
+  32 * 4,                      /* %psr */
+  33 * 4,                      /* %pc */
+  34 * 4,                      /* %npc */
+  35 * 4,                      /* %y */
+  -1,                          /* %wim */
+  -1,                          /* %tbr */
+  1 * 4,                       /* %g1 */
+  16 * 4,                      /* %l0 */
+  4,                           /* y size */
+};
+\f
+
+static void
+sparc32_linux_supply_core_gregset (const struct regset *regset,
+                                  struct regcache *regcache,
+                                  int regnum, const void *gregs, size_t len)
+{
+  sparc32_supply_gregset (&sparc32_linux_core_gregset, regcache, regnum, gregs);
+}
+
+static void
+sparc32_linux_collect_core_gregset (const struct regset *regset,
+                                   const struct regcache *regcache,
+                                   int regnum, void *gregs, size_t len)
+{
+  sparc32_collect_gregset (&sparc32_linux_core_gregset, regcache, regnum, gregs);
+}
+
+static void
+sparc32_linux_supply_core_fpregset (const struct regset *regset,
+                                   struct regcache *regcache,
+                                   int regnum, const void *fpregs, size_t len)
+{
+  sparc32_supply_fpregset (regcache, regnum, fpregs);
+}
+
+static void
+sparc32_linux_collect_core_fpregset (const struct regset *regset,
+                                    const struct regcache *regcache,
+                                    int regnum, void *fpregs, size_t len)
+{
+  sparc32_collect_fpregset (regcache, regnum, fpregs);
+}
+
 \f
 
 static void
@@ -131,6 +224,14 @@ sparc32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
+  tdep->gregset = regset_alloc (gdbarch, sparc32_linux_supply_core_gregset,
+                               sparc32_linux_collect_core_gregset);
+  tdep->sizeof_gregset = 152;
+
+  tdep->fpregset = regset_alloc (gdbarch, sparc32_linux_supply_core_fpregset,
+                                sparc32_linux_collect_core_fpregset);
+  tdep->sizeof_fpregset = 396;
+
   tramp_frame_prepend_unwinder (gdbarch, &sparc32_linux_sigframe);
   tramp_frame_prepend_unwinder (gdbarch, &sparc32_linux_rt_sigframe);
 
@@ -145,11 +246,17 @@ sparc32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   /* 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, &floatformat_ieee_double_big);
+  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);
+
+  /* Make sure we can single-step over signal return system calls.  */
+  tdep->step_trap = sparc32_linux_step_trap;
+
+  /* Hook in the DWARF CFI frame unwinder.  */
+  frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
 }
 
 /* Provide a prototype to silence -Wmissing-prototypes.  */