gdb/

	* configure.tgt: Handle tic6x-*-*linux and tic6x-*-*.
	* solib-dsbt.c: New file.  Support DSBT shared object.
	* tic6x-linux-tdep.c: New file.
	* tic6x-tdep.c: New file.
	* tic6x-tdep.h: New file.

1 files changed, 227 insertions, 0 deletions

diff --git a/gdb/tic6x-linux-tdep.c b/gdb/tic6x-linux-tdep.c
new file mode 100644
index 0000000..0e4d327
--- /dev/null
+++ b/gdb/tic6x-linux-tdep.c
@@ -0,0 +1,227 @@
+/* GNU/Linux on  TI C6x target support.
+   Copyright (C) 2011
+   Free Software Foundation, Inc.
+   Contributed by Yao Qi <yao@codesourcery.com>
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "solib.h"
+#include "osabi.h"
+#include "linux-tdep.h"
+#include "tic6x-tdep.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
+#include "gdb_assert.h"
+#include "elf-bfd.h"
+#include "elf/tic6x.h"
+
+#include "features/tic6x-c64xp-linux.c"
+#include "features/tic6x-c64x-linux.c"
+#include "features/tic6x-c62x-linux.c"
+
+/* The offset from rt_sigframe pointer to SP register.  */
+#define TIC6X_SP_RT_SIGFRAME 8
+/* Size of struct siginfo info.  */
+#define TIC6X_SIGINFO_SIZE 128
+/* Size of type stack_t, which contains three fields of type void*, int, and
+   size_t respectively.  */
+#define TIC6X_STACK_T_SIZE (3 * 4)
+
+const gdb_byte tic6x_bkpt_illegal_opcode_be[] = { 0x56, 0x45, 0x43, 0x14 };
+const gdb_byte tic6x_bkpt_illegal_opcode_le[] = { 0x14, 0x43, 0x45, 0x56 };
+
+static const gdb_byte tic6x_bkpt_bnop_be[] = { 0x00, 0x00, 0xa1, 0x22 };
+static const gdb_byte tic6x_bkpt_bnop_le[] = { 0x22, 0xa1, 0x00, 0x00 };
+
+/* Return the offset of register REGNUM in struct sigcontext.  Return 0 if no
+   such register in sigcontext.  */
+
+static unsigned int
+tic6x_register_sigcontext_offset (unsigned int regnum, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  if (regnum == TIC6X_A4_REGNUM || regnum == TIC6X_A4_REGNUM + 2
+      || regnum == TIC6X_A4_REGNUM + 4)
+    return 4 * (regnum - TIC6X_A4_REGNUM + 2);	/* A4, A6, A8 */
+  else if (regnum == TIC6X_A5_REGNUM || regnum == TIC6X_A5_REGNUM + 2
+	   || regnum == TIC6X_A5_REGNUM + 4)
+    return 4 * (regnum - TIC6X_A5_REGNUM + 12);	/* A5, A7, A9 */
+  else if (regnum == TIC6X_B4_REGNUM || regnum == TIC6X_B4_REGNUM + 2
+	   || regnum == TIC6X_B4_REGNUM + 4)
+    return 4 * (regnum - TIC6X_B4_REGNUM + 3);	/* B4, B6, B8 */
+  else if (regnum == TIC6X_B5_REGNUM || regnum == TIC6X_B5_REGNUM + 2
+	   || regnum == TIC6X_B5_REGNUM + 4)
+    return 4 * (regnum - TIC6X_B5_REGNUM + 19);	/* B5, B7, B9 */
+  else if (regnum >= 0 && regnum < TIC6X_A4_REGNUM)
+    return 4 * (regnum - 0 + 8);	/* A0 - A3 */
+  else if (regnum >= TIC6X_B0_REGNUM && regnum < TIC6X_B4_REGNUM)
+    return 4 * (regnum - TIC6X_B0_REGNUM + 15);	/* B0 - B3 */
+  else if (regnum >= 34 && regnum < 34 + 32)
+    return 4 * (regnum - 34 + 23);	/* A16 - A31, B16 - B31 */
+  else if (regnum == TIC6X_PC_REGNUM)
+    return 4 * (tdep->has_gp ? 55 : 23);
+  else if (regnum == TIC6X_SP_REGNUM)
+    return 4;
+
+  return 0;
+}
+
+/* Support unwinding frame in signal trampoline.  We don't check sigreturn,
+   since it is not used in kernel.  */
+
+static void
+tic6x_linux_rt_sigreturn_init (const struct tramp_frame *self,
+			       struct frame_info *this_frame,
+			       struct trad_frame_cache *this_cache,
+			       CORE_ADDR func)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  CORE_ADDR sp = get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM);
+  /* The base of struct sigcontext is computed by examining the definition of
+     struct rt_sigframe in linux kernel source arch/c6x/kernel/signal.c.  */
+  CORE_ADDR base = (sp + TIC6X_SP_RT_SIGFRAME
+		    /* Pointer type *pinfo and *puc in struct rt_sigframe.  */
+		    + 4 + 4
+		    + TIC6X_SIGINFO_SIZE
+		    + 4 + 4 /* uc_flags and *uc_link in struct ucontext.  */
+		    + TIC6X_STACK_T_SIZE);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  unsigned int reg_offset;
+  unsigned int i;
+
+  for (i = 0; i < 10; i++)	/* A0 - A9 */
+    {
+      reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
+      gdb_assert (reg_offset != 0);
+
+      trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
+    }
+
+  for (i = TIC6X_B0_REGNUM; i < TIC6X_B0_REGNUM + 10; i++)	/* B0 - B9 */
+    {
+      reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
+      gdb_assert (reg_offset != 0);
+
+      trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
+    }
+
+  if (tdep->has_gp)
+    for (i = 34; i < 34 + 32; i++)	/* A16 - A31, B16 - B31 */
+      {
+	reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
+	gdb_assert (reg_offset != 0);
+
+	trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
+      }
+
+  trad_frame_set_reg_addr (this_cache, TIC6X_PC_REGNUM,
+			   base + tic6x_register_sigcontext_offset (TIC6X_PC_REGNUM,
+								    gdbarch));
+  trad_frame_set_reg_addr (this_cache, TIC6X_SP_REGNUM,
+			   base + tic6x_register_sigcontext_offset (TIC6X_SP_REGNUM,
+								    gdbarch));
+
+  /* Save a frame ID.  */
+  trad_frame_set_id (this_cache, frame_id_build (sp, func));
+}
+
+static struct tramp_frame tic6x_linux_rt_sigreturn_tramp_frame =
+{
+  SIGTRAMP_FRAME,
+  4,
+  {
+    {0x000045aa, 0x0fffffff},	/* mvk .S2 139,b0 */
+    {0x10000000, -1},		/* swe */
+    {TRAMP_SENTINEL_INSN}
+  },
+  tic6x_linux_rt_sigreturn_init
+};
+
+/* When FRAME is at a syscall instruction, return the PC of the next
+   instruction to be executed.  */
+
+static CORE_ADDR
+tic6x_linux_syscall_next_pc (struct frame_info *frame)
+{
+  ULONGEST syscall_number = get_frame_register_unsigned (frame,
+							 TIC6X_B0_REGNUM);
+  CORE_ADDR pc = get_frame_pc (frame);
+
+  if (syscall_number == 139 /* rt_sigreturn */)
+    return frame_unwind_caller_pc (frame);
+
+  return pc + 4;
+}
+
+
+extern struct target_so_ops dsbt_so_ops;
+static void
+tic6x_uclinux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  linux_init_abi (info, gdbarch);
+
+  /* Shared library handling.  */
+  set_solib_ops (gdbarch, &dsbt_so_ops);
+
+  tdep->syscall_next_pc = tic6x_linux_syscall_next_pc;
+
+#ifdef HAVE_ELF
+  /* In tic6x Linux kernel, breakpoint instructions varies on different archs.
+     On C64x+ and C67x+, breakpoint instruction is 0x56454314, which is an
+     illegal opcode.  On other arch, breakpoint instruction is 0x0000a122
+     (BNOP .S2 0,5).  */
+  if (info.abfd)
+    switch (bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, Tag_ISA))
+      {
+      case C6XABI_Tag_ISA_C64XP:
+      case C6XABI_Tag_ISA_C67XP:
+	if (info.byte_order == BFD_ENDIAN_BIG)
+	  tdep->breakpoint = tic6x_bkpt_illegal_opcode_be;
+	else
+	  tdep->breakpoint = tic6x_bkpt_illegal_opcode_le;
+	break;
+      default:
+	{
+	  if (info.byte_order == BFD_ENDIAN_BIG)
+	    tdep->breakpoint = tic6x_bkpt_bnop_be;
+	  else
+	    tdep->breakpoint = tic6x_bkpt_bnop_le;
+	}
+      }
+#endif
+
+  /* Signal trampoline support.  */
+  tramp_frame_prepend_unwinder (gdbarch,
+				&tic6x_linux_rt_sigreturn_tramp_frame);
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+extern initialize_file_ftype _initialize_tic6x_linux_tdep;
+
+void
+_initialize_tic6x_linux_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_tic6x, 0, GDB_OSABI_LINUX,
+			  tic6x_uclinux_init_abi);
+
+  initialize_tdesc_tic6x_c64xp_linux ();
+  initialize_tdesc_tic6x_c64x_linux ();
+  initialize_tdesc_tic6x_c62x_linux ();
+}