2013-02-04 Andreas Tobler <andreast@fgznet.ch>

	* Makefile.in (ALL_TARGET_OBS): Add powerpc FreeBSD files.
	* configure.host: Add powerpc*-*-freebsd* target.
	* configure.tgt: Add target info for powerpc*-*-freebsd*.
	* ppcfbsd-nat.c, ppcfbsd-tdep.h, ppcfbsd-tdep.c: New files.
	* config/powerpc/fbsd.mh: New file.

1 files changed, 355 insertions, 0 deletions

diff --git a/gdb/ppcfbsd-tdep.c b/gdb/ppcfbsd-tdep.c
new file mode 100644
index 0000000..f18ed4f
--- /dev/null
+++ b/gdb/ppcfbsd-tdep.c
@@ -0,0 +1,355 @@
+/* Target-dependent code for PowerPC systems running FreeBSD.
+
+   Copyright (C) 2013 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 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 "frame.h"
+#include "gdbcore.h"
+#include "frame-unwind.h"
+#include "gdbtypes.h"
+#include "osabi.h"
+#include "regcache.h"
+#include "regset.h"
+#include "symtab.h"
+#include "target.h"
+#include "trad-frame.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
+#include "ppc-tdep.h"
+#include "ppc64-tdep.h"
+#include "ppcfbsd-tdep.h"
+#include "solib-svr4.h"
+
+
+/* 32-bit regset descriptions.  */
+
+static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets =
+  {
+	/* General-purpose registers.  */
+	/* .r0_offset = */     0,
+	/* .gpr_size = */      4,
+	/* .xr_size = */       4,
+	/* .pc_offset = */     144,
+	/* .ps_offset = */     -1,
+	/* .cr_offset = */     132,
+	/* .lr_offset = */     128,
+	/* .ctr_offset = */    140,
+	/* .xer_offset = */    136,
+	/* .mq_offset = */     -1,
+
+	/* Floating-point registers.  */
+	/* .f0_offset = */     0,
+	/* .fpscr_offset = */  256,
+	/* .fpscr_size = */    8,
+#ifdef NOTYET
+	/* AltiVec registers.  */
+	/* .vr0_offset = */    0,
+	/* .vscr_offset = */   512 + 12,
+	/* .vrsave_offset = */ 512
+#endif
+  };
+
+/* 64-bit regset descriptions.  */
+
+static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets =
+  {
+	/* General-purpose registers.  */
+	/* .r0_offset = */     0,
+	/* .gpr_size = */      8,
+	/* .xr_size = */       8,
+	/* .pc_offset = */     288,
+	/* .ps_offset = */     -1,
+	/* .cr_offset = */     264,
+	/* .lr_offset = */     256,
+	/* .ctr_offset = */    280,
+	/* .xer_offset = */    272,
+	/* .mq_offset = */     -1,
+
+	/* Floating-point registers.  */
+	/* .f0_offset = */     0,
+	/* .fpscr_offset = */  256,
+	/* .fpscr_size = */    8,
+#ifdef NOYET
+	/* AltiVec registers.  */
+	/* .vr0_offset = */    0,
+	/* .vscr_offset = */   512 + 12,
+	/* .vrsave_offset = */ 528
+#endif
+  };
+
+/* 32-bit general-purpose register set.  */
+
+static const struct regset ppc32_fbsd_gregset = {
+  &ppc32_fbsd_reg_offsets,
+  ppc_supply_gregset,
+  ppc_collect_gregset,
+  NULL
+};
+
+/* 64-bit general-purpose register set.  */
+
+static const struct regset ppc64_fbsd_gregset = {
+  &ppc64_fbsd_reg_offsets,
+  ppc_supply_gregset,
+  ppc_collect_gregset,
+  NULL
+};
+
+/* 32-/64-bit floating-point register set.  */
+
+static struct regset ppc32_fbsd_fpregset = {
+  &ppc32_fbsd_reg_offsets,
+  ppc_supply_fpregset,
+  ppc_collect_fpregset
+};
+
+const struct regset *
+ppc_fbsd_gregset (int wordsize)
+{
+  return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset;
+}
+
+const struct regset *
+ppc_fbsd_fpregset (void)
+{
+  return &ppc32_fbsd_fpregset;
+}
+
+/* Return the appropriate register set for the core section identified
+   by SECT_NAME and SECT_SIZE.  */
+
+static const struct regset *
+ppcfbsd_regset_from_core_section (struct gdbarch *gdbarch,
+				  const char *sect_name, size_t sect_size)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  if (strcmp (sect_name, ".reg") == 0 && sect_size >= 148)
+    {
+      if (tdep->wordsize == 4)
+	return &ppc32_fbsd_gregset;
+      else
+	return &ppc64_fbsd_gregset;
+    }
+  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= 264)
+    return &ppc32_fbsd_fpregset;
+  return NULL;
+}
+
+/* Default page size.  */
+
+static const int ppcfbsd_page_size = 4096;
+
+/* Offset for sigreturn(2).  */
+
+static const int ppcfbsd_sigreturn_offset[] = {
+  0xc,				/* FreeBSD 32-bit  */
+  -1
+};
+
+/* Signal trampolines.  */
+
+static int
+ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
+				struct frame_info *this_frame,
+				void **this_cache)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  CORE_ADDR pc = get_frame_pc (this_frame);
+  CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1));
+  const int *offset;
+  const char *name;
+
+  /* A stack trampoline is detected if no name is associated
+   to the current pc and if it points inside a trampoline
+   sequence.  */
+
+  find_pc_partial_function (pc, &name, NULL, NULL);
+
+  /* If we have a name, we have no trampoline, return.  */
+  if (name)
+    return 0;
+
+  for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++)
+    {
+      gdb_byte buf[2 * PPC_INSN_SIZE];
+      unsigned long insn;
+
+      if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
+				     buf, sizeof buf))
+	continue;
+
+      /* Check for "li r0,SYS_sigreturn".  */
+      insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order);
+      if (insn != 0x380001a1)
+	continue;
+
+      /* Check for "sc".  */
+      insn = extract_unsigned_integer (buf + PPC_INSN_SIZE,
+				       PPC_INSN_SIZE, byte_order);
+      if (insn != 0x44000002)
+	continue;
+
+      return 1;
+    }
+
+  return 0;
+}
+
+static struct trad_frame_cache *
+ppcfbsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  struct trad_frame_cache *cache;
+  CORE_ADDR addr, base, func;
+  gdb_byte buf[PPC_INSN_SIZE];
+  int i;
+
+  if (*this_cache)
+    return *this_cache;
+
+  cache = trad_frame_cache_zalloc (this_frame);
+  *this_cache = cache;
+
+  func = get_frame_pc (this_frame);
+  func &= ~(ppcfbsd_page_size - 1);
+  if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf))
+    return cache;
+
+  base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
+  addr = base + 0x10 + 2 * tdep->wordsize;
+  for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
+    {
+      int regnum = i + tdep->ppc_gp0_regnum;
+      trad_frame_set_reg_addr (cache, regnum, addr);
+    }
+  trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
+  addr += tdep->wordsize;
+  trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
+  addr += tdep->wordsize;
+  trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
+  addr += tdep->wordsize;
+  trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
+  addr += tdep->wordsize;
+  trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
+  /* SRR0?  */
+  addr += tdep->wordsize;
+
+  /* Construct the frame ID using the function start.  */
+  trad_frame_set_id (cache, frame_id_build (base, func));
+
+  return cache;
+}
+
+static void
+ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
+				void **this_cache, struct frame_id *this_id)
+{
+  struct trad_frame_cache *cache =
+    ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
+
+  trad_frame_get_id (cache, this_id);
+}
+
+static struct value *
+ppcfbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
+				      void **this_cache, int regnum)
+{
+  struct trad_frame_cache *cache =
+    ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
+
+  return trad_frame_get_register (cache, this_frame, regnum);
+}
+
+static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = {
+  SIGTRAMP_FRAME,
+  default_frame_unwind_stop_reason,
+  ppcfbsd_sigtramp_frame_this_id,
+  ppcfbsd_sigtramp_frame_prev_register,
+  NULL,
+  ppcfbsd_sigtramp_frame_sniffer
+};
+
+static enum return_value_convention
+ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function,
+		      struct type *valtype, struct regcache *regcache,
+		      gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+  return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype,
+					   regcache, readbuf, writebuf);
+}
+
+
+static void
+ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* FreeBSD doesn't support the 128-bit `long double' from the psABI.  */
+  set_gdbarch_long_double_bit (gdbarch, 64);
+  set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
+
+  if (tdep->wordsize == 4)
+    {
+      set_gdbarch_return_value (gdbarch, ppcfbsd_return_value);
+
+      set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+      set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					     svr4_ilp32_fetch_link_map_offsets);
+
+      frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind);
+      set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc");
+    }
+
+  if (tdep->wordsize == 8)
+    {
+      set_gdbarch_convert_from_func_ptr_addr
+	(gdbarch, ppc64_convert_from_func_ptr_addr);
+      set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code);
+      set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					     svr4_lp64_fetch_link_map_offsets);
+      set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc");
+    }
+
+  set_gdbarch_regset_from_core_section
+    (gdbarch, ppcfbsd_regset_from_core_section);
+
+  set_gdbarch_fetch_tls_load_module_address (gdbarch,
+					     svr4_fetch_objfile_link_map);
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+
+void _initialize_ppcfbsd_tdep (void);
+
+void
+_initialize_ppcfbsd_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD_ELF,
+			  ppcfbsd_init_abi);
+  gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64,
+			  GDB_OSABI_FREEBSD_ELF,
+			  ppcfbsd_init_abi);
+  gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD_ELF,
+			  ppcfbsd_init_abi);
+}