gdb: bfin: new port

Initial support for Blackfin processors.  This supports the standard ABI.

Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 175 insertions, 0 deletions

diff --git a/gdb/bfin-linux-tdep.c b/gdb/bfin-linux-tdep.c
new file mode 100644
index 0000000..545bdcf
--- /dev/null
+++ b/gdb/bfin-linux-tdep.c
@@ -0,0 +1,175 @@
+/* Target-dependent code for Analog Devices Blackfin processor, for GDB.
+
+   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010
+   Free Software Foundation, Inc.
+
+   Contributed by Analog Devices, 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 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 "arch-utils.h"
+#include "regcache.h"
+#include "tramp-frame.h"
+#include "trad-frame.h"
+#include "osabi.h"
+#include "xml-syscall.h"
+#include "linux-tdep.h"
+#include "bfin-tdep.h"
+
+/* From <asm/sigcontext.h>.  */
+
+#define SIGCONTEXT_OFFSET	168
+
+static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS] =
+{
+  0 * 4,	/* %r0 */
+  1 * 4,	/* %r1 */
+  2 * 4,	/* %r2 */
+  3 * 4,	/* %r3 */
+  4 * 4,	/* %r4 */
+  5 * 4,	/* %r5 */
+  6 * 4,	/* %r6 */
+  7 * 4,	/* %r7 */
+  8 * 4,	/* %p0 */
+  9 * 4,	/* %p1 */
+  10 * 4,	/* %p2 */
+  11 * 4,	/* %p3 */
+  12 * 4,	/* %p4 */
+  13 * 4,	/* %p5 */
+  14 * 4,	/* %sp */
+  23 * 4,	/* %fp */
+  24 * 4,	/* %i0 */
+  25 * 4,	/* %i1 */
+  26 * 4,	/* %i2 */
+  27 * 4,	/* %i3 */
+  28 * 4,	/* %m0 */
+  29 * 4,	/* %m1 */
+  30 * 4,	/* %m2 */
+  31 * 4,	/* %m3 */
+  36 * 4,	/* %b0 */
+  37 * 4,	/* %b1 */
+  38 * 4,	/* %b2 */
+  39 * 4,	/* %b3 */
+  32 * 4,	/* %l0 */
+  33 * 4,	/* %l1 */
+  34 * 4,	/* %l2 */
+  35 * 4,	/* %l3 */
+  17 * 4,	/* %a0x */
+  15 * 4,	/* %a0w */
+  18 * 4,	/* %a1x */
+  16 * 4,	/* %a1w */
+  19 * 4,	/* %astat */
+  20 * 4,	/* %rets */
+  40 * 4,	/* %lc0 */
+  42 * 4,	/* %lt0 */
+  44 * 4,	/* %lb0 */
+  41 * 4,	/* %lc1 */
+  43 * 4,	/* %lt1 */
+  45 * 4,	/* %lb1 */
+  -1,		/* %cycles */
+  -1,		/* %cycles2 */
+  -1,		/* %usp */
+  46 * 4,	/* %seqstat */
+  -1,		/* syscfg */
+  21 * 4,	/* %reti */
+  22 * 4,	/* %retx */
+  -1,		/* %retn */
+  -1,		/* %rete */
+  21 * 4,	/* %pc */
+};
+
+/* Signal trampolines.  */
+
+static void
+bfin_linux_sigframe_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_sp (this_frame);
+  CORE_ADDR pc = get_frame_pc (this_frame);
+  CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET;
+  struct frame_id this_id;
+  const int *reg_offset = bfin_linux_sigcontext_reg_offset;
+  int i;
+
+  for (i = 0; i < BFIN_NUM_REGS; i++)
+    if (reg_offset[i] != -1)
+      trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]);
+
+  /* This would come after the LINK instruction in the ret_from_signal
+     function, hence the frame id would be SP + 8.  */
+  trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc));
+}
+
+static const struct tramp_frame bfin_linux_sigframe =
+{
+  SIGTRAMP_FRAME,
+  4,
+  {
+    { 0x00ADE128, 0xffffffff },	/* P0 = __NR_rt_sigreturn; */
+    { 0x00A0, 0xffff },		/* EXCPT 0; */
+    { TRAMP_SENTINEL_INSN, -1 },
+  },
+  bfin_linux_sigframe_init,
+};
+
+static LONGEST
+bfin_linux_get_syscall_number (struct gdbarch *gdbarch,
+                               ptid_t ptid)
+{
+  struct regcache *regcache = get_thread_regcache (ptid);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  /* The content of a register.  */
+  gdb_byte buf[4];
+  /* The result.  */
+  LONGEST ret;
+
+  /* Getting the system call number from the register.
+     When dealing with Blackfin architecture, this information
+     is stored at %p0 register.  */
+  regcache_cooked_read (regcache, BFIN_P0_REGNUM, buf);
+
+  ret = extract_signed_integer (buf, 4, byte_order);
+
+  return ret;
+}
+
+static void
+bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  linux_init_abi (info, gdbarch);
+
+  /* Set the sigtramp frame sniffer.  */
+  tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe);
+
+  /* Functions for 'catch syscall'.  */
+  set_xml_syscall_file_name ("syscalls/bfin-linux.xml");
+  set_gdbarch_get_syscall_number (gdbarch,
+                                  bfin_linux_get_syscall_number);
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+extern initialize_file_ftype _initialize_bfin_linux_tdep;
+
+void
+_initialize_bfin_linux_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX,
+                          bfin_linux_init_abi);
+}