* defs.h (extract_signed_integer, extract_unsigned_integer,

[thirdparty/binutils-gdb.git] / gdb / sparc64-linux-tdep.c

diff --git a/gdb/sparc64-linux-tdep.c b/gdb/sparc64-linux-tdep.c
index dd3b622a9595fd9b8bfae115b6c933b0fc20336b..965904ef82ea0b36fcb744b4e129739237d4c195 100644 (file)
--- a/gdb/sparc64-linux-tdep.c
+++ b/gdb/sparc64-linux-tdep.c
@@ -1,12 +1,13 @@
 /* Target-dependent code for GNU/Linux UltraSPARC.
 
-   Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009
+   Free Software Foundation, Inc.
 
    This file is part of GDB.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -15,13 +16,12 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
 #include "frame.h"
 #include "frame-unwind.h"
+#include "dwarf2-frame.h"
 #include "regset.h"
 #include "regcache.h"
 #include "gdbarch.h"
@@ -37,7 +37,7 @@
 /* Signal trampoline support.  */
 
 static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
-                                        struct frame_info *next_frame,
+                                        struct frame_info *this_frame,
                                         struct trad_frame_cache *this_cache,
                                         CORE_ADDR func);
 
@@ -58,14 +58,14 @@ static const struct tramp_frame sparc64_linux_rt_sigframe =
 
 static void
 sparc64_linux_sigframe_init (const struct tramp_frame *self,
-                            struct frame_info *next_frame,
+                            struct frame_info *this_frame,
                             struct trad_frame_cache *this_cache,
                             CORE_ADDR func)
 {
   CORE_ADDR base, addr, sp_addr;
   int regnum;
 
-  base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
+  base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM);
   base += 128;
 
   /* Offsets from <bits/sigcontext.h>.  */
@@ -85,11 +85,11 @@ sparc64_linux_sigframe_init (const struct tramp_frame *self,
   trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
   trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
 
-  base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
+  base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
   if (base & 1)
     base += BIAS;
 
-  addr = get_frame_memory_unsigned (next_frame, sp_addr, 8);
+  addr = get_frame_memory_unsigned (this_frame, sp_addr, 8);
   if (addr & 1)
     addr += BIAS;
 
@@ -105,14 +105,14 @@ sparc64_linux_sigframe_init (const struct tramp_frame *self,
    address.  */
 
 static CORE_ADDR
-sparc64_linux_step_trap (unsigned long insn)
+sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
 {
   if (insn == 0x91d0206d)
     {
-      ULONGEST sp;
+      struct gdbarch *gdbarch = get_frame_arch (frame);
+      enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 
-      regcache_cooked_read_unsigned (current_regcache,
-                                    SPARC_SP_REGNUM, &sp);
+      ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
       if (sp & 1)
        sp += BIAS;
 
@@ -125,7 +125,8 @@ sparc64_linux_step_trap (unsigned long insn)
         register save area.  The saved PC sits at a 136 byte offset
         into there.  */
 
-      return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8);
+      return read_memory_unsigned_integer (sp + 192 + 128 + 136,
+                                          8, byte_order);
     }
 
   return 0;
@@ -178,6 +179,32 @@ sparc64_linux_collect_core_fpregset (const struct regset *regset,
   sparc64_collect_fpregset (regcache, regnum, fpregs);
 }
 
+/* Set the program counter for process PTID to PC.  */
+
+#define TSTATE_SYSCALL 0x0000000000000020ULL
+
+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 &= ~TSTATE_SYSCALL;
+  regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state);
+}
+
 \f
 
 static void
@@ -195,6 +222,9 @@ sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
 
+  /* Hook in the DWARF CFI frame unwinder.  */
+  dwarf2_append_unwinders (gdbarch);
+
   sparc64_init_abi (info, gdbarch);
 
   /* GNU/Linux has SVR4-style shared libraries...  */
@@ -212,6 +242,8 @@ sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   /* 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);
 }
 \f