Add missing file from the previous commit.

2 files changed, 397 insertions, 0 deletions

diff --git a/gdb/ppc64-tdep.c b/gdb/ppc64-tdep.c
new file mode 100644
index 00000000000..9c3616a1a27
--- /dev/null
+++ b/gdb/ppc64-tdep.c
@@ -0,0 +1,363 @@
+/* Common target-dependent code for ppc64 GDB, the GNU debugger.
+
+   Copyright (C) 1986-2013 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 "frame.h"
+#include "gdbcore.h"
+#include "ppc-tdep.h"
+#include "ppc64-tdep.h"
+
+/* Macros for matching instructions.  Note that, since all the
+   operands are masked off before they're or-ed into the instruction,
+   you can use -1 to make masks.  */
+
+#define insn_d(opcd, rts, ra, d)                \
+  ((((opcd) & 0x3f) << 26)                      \
+   | (((rts) & 0x1f) << 21)                     \
+   | (((ra) & 0x1f) << 16)                      \
+   | ((d) & 0xffff))
+
+#define insn_ds(opcd, rts, ra, d, xo)           \
+  ((((opcd) & 0x3f) << 26)                      \
+   | (((rts) & 0x1f) << 21)                     \
+   | (((ra) & 0x1f) << 16)                      \
+   | ((d) & 0xfffc)                             \
+   | ((xo) & 0x3))
+
+#define insn_xfx(opcd, rts, spr, xo)            \
+  ((((opcd) & 0x3f) << 26)                      \
+   | (((rts) & 0x1f) << 21)                     \
+   | (((spr) & 0x1f) << 16)                     \
+   | (((spr) & 0x3e0) << 6)                     \
+   | (((xo) & 0x3ff) << 1))
+
+/* If DESC is the address of a 64-bit PowerPC FreeBSD function
+   descriptor, return the descriptor's entry point.  */
+
+static CORE_ADDR
+ppc64_desc_entry_point (struct gdbarch *gdbarch, CORE_ADDR desc)
+{
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  /* The first word of the descriptor is the entry point.  */
+  return (CORE_ADDR) read_memory_unsigned_integer (desc, 8, byte_order);
+}
+
+/* Pattern for the standard linkage function.  These are built by
+   build_plt_stub in elf64-ppc.c, whose GLINK argument is always
+   zero.  */
+
+static struct ppc_insn_pattern ppc64_standard_linkage1[] =
+  {
+    /* addis r12, r2, <any> */
+    { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
+
+    /* std r2, 40(r1) */
+    { -1, insn_ds (62, 2, 1, 40, 0), 0 },
+
+    /* ld r11, <any>(r12) */
+    { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
+
+    /* addis r12, r12, 1 <optional> */
+    { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 },
+
+    /* ld r2, <any>(r12) */
+    { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 },
+
+    /* addis r12, r12, 1 <optional> */
+    { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 },
+
+    /* mtctr r11 */
+    { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
+
+    /* ld r11, <any>(r12) <optional> */
+    { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 },
+
+    /* bctr */
+    { -1, 0x4e800420, 0 },
+
+    { 0, 0, 0 }
+  };
+
+#define PPC64_STANDARD_LINKAGE1_LEN ARRAY_SIZE (ppc64_standard_linkage1)
+
+static struct ppc_insn_pattern ppc64_standard_linkage2[] =
+  {
+    /* addis r12, r2, <any> */
+    { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
+
+    /* std r2, 40(r1) */
+    { -1, insn_ds (62, 2, 1, 40, 0), 0 },
+
+    /* ld r11, <any>(r12) */
+    { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
+
+    /* addi r12, r12, <any> <optional> */
+    { insn_d (-1, -1, -1, 0), insn_d (14, 12, 12, 0), 1 },
+
+    /* mtctr r11 */
+    { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
+
+    /* ld r2, <any>(r12) */
+    { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 },
+
+    /* ld r11, <any>(r12) <optional> */
+    { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 },
+
+    /* bctr */
+    { -1, 0x4e800420, 0 },
+
+    { 0, 0, 0 }
+  };
+
+#define PPC64_STANDARD_LINKAGE2_LEN ARRAY_SIZE (ppc64_standard_linkage2)
+
+static struct ppc_insn_pattern ppc64_standard_linkage3[] =
+  {
+    /* std r2, 40(r1) */
+    { -1, insn_ds (62, 2, 1, 40, 0), 0 },
+
+    /* ld r11, <any>(r2) */
+    { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 },
+
+    /* addi r2, r2, <any> <optional> */
+    { insn_d (-1, -1, -1, 0), insn_d (14, 2, 2, 0), 1 },
+
+    /* mtctr r11 */
+    { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
+
+    /* ld r11, <any>(r2) <optional> */
+    { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 1 },
+
+    /* ld r2, <any>(r2) */
+    { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 },
+
+    /* bctr */
+    { -1, 0x4e800420, 0 },
+
+    { 0, 0, 0 }
+  };
+
+#define PPC64_STANDARD_LINKAGE3_LEN ARRAY_SIZE (ppc64_standard_linkage3)
+
+/* When the dynamic linker is doing lazy symbol resolution, the first
+   call to a function in another object will go like this:
+
+   - The user's function calls the linkage function:
+
+	 100007c4:	4b ff fc d5		bl	10000498
+	 100007c8:	e8 41 00 28		ld	r2,40(r1)
+
+   - The linkage function loads the entry point (and other stuff) from
+	 the function descriptor in the PLT, and jumps to it:
+
+	 10000498:	3d 82 00 00		addis	r12,r2,0
+	 1000049c:	f8 41 00 28		std	r2,40(r1)
+	 100004a0:	e9 6c 80 98		ld	r11,-32616(r12)
+	 100004a4:	e8 4c 80 a0		ld	r2,-32608(r12)
+	 100004a8:	7d 69 03 a6		mtctr	r11
+	 100004ac:	e9 6c 80 a8		ld	r11,-32600(r12)
+	 100004b0:	4e 80 04 20		bctr
+
+   - But since this is the first time that PLT entry has been used, it
+	 sends control to its glink entry.  That loads the number of the
+	 PLT entry and jumps to the common glink0 code:
+
+	 10000c98:	38 00 00 00		li	r0,0
+	 10000c9c:	4b ff ff dc		b	10000c78
+
+   - The common glink0 code then transfers control to the dynamic
+	 linker's fixup code:
+
+	 10000c78:	e8 41 00 28		ld	r2,40(r1)
+	 10000c7c:	3d 82 00 00		addis	r12,r2,0
+	 10000c80:	e9 6c 80 80		ld	r11,-32640(r12)
+	 10000c84:	e8 4c 80 88		ld	r2,-32632(r12)
+	 10000c88:	7d 69 03 a6		mtctr	r11
+	 10000c8c:	e9 6c 80 90		ld	r11,-32624(r12)
+	 10000c90:	4e 80 04 20		bctr
+
+   Eventually, this code will figure out how to skip all of this,
+   including the dynamic linker.  At the moment, we just get through
+   the linkage function.  */
+
+/* If the current thread is about to execute a series of instructions
+   at PC matching the ppc64_standard_linkage pattern, and INSN is the result
+   from that pattern match, return the code address to which the
+   standard linkage function will send them.  (This doesn't deal with
+   dynamic linker lazy symbol resolution stubs.)  */
+
+static CORE_ADDR
+ppc64_standard_linkage1_target (struct frame_info *frame,
+				CORE_ADDR pc, unsigned int *insn)
+{
+  struct gdbarch *gdbarch = get_frame_arch (frame);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* The address of the function descriptor this linkage function
+     references.  */
+  CORE_ADDR desc
+    = ((CORE_ADDR) get_frame_register_unsigned (frame,
+						tdep->ppc_gp0_regnum + 2)
+       + (ppc_insn_d_field (insn[0]) << 16)
+       + ppc_insn_ds_field (insn[2]));
+
+  /* The first word of the descriptor is the entry point.  Return that.  */
+  return ppc64_desc_entry_point (gdbarch, desc);
+}
+
+static CORE_ADDR
+ppc64_standard_linkage2_target (struct frame_info *frame,
+				CORE_ADDR pc, unsigned int *insn)
+{
+  struct gdbarch *gdbarch = get_frame_arch (frame);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* The address of the function descriptor this linkage function
+     references.  */
+  CORE_ADDR desc
+    = ((CORE_ADDR) get_frame_register_unsigned (frame,
+						tdep->ppc_gp0_regnum + 2)
+       + (ppc_insn_d_field (insn[0]) << 16)
+       + ppc_insn_ds_field (insn[2]));
+
+  /* The first word of the descriptor is the entry point.  Return that.  */
+  return ppc64_desc_entry_point (gdbarch, desc);
+}
+
+static CORE_ADDR
+ppc64_standard_linkage3_target (struct frame_info *frame,
+				CORE_ADDR pc, unsigned int *insn)
+{
+  struct gdbarch *gdbarch = get_frame_arch (frame);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* The address of the function descriptor this linkage function
+     references.  */
+  CORE_ADDR desc
+    = ((CORE_ADDR) get_frame_register_unsigned (frame,
+						tdep->ppc_gp0_regnum + 2)
+       + ppc_insn_ds_field (insn[1]));
+
+  /* The first word of the descriptor is the entry point.  Return that.  */
+  return ppc64_desc_entry_point (gdbarch, desc);
+}
+
+
+/* Given that we've begun executing a call trampoline at PC, return
+   the entry point of the function the trampoline will go to.  */
+
+CORE_ADDR
+ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
+{
+  unsigned int ppc64_standard_linkage1_insn[PPC64_STANDARD_LINKAGE1_LEN];
+  unsigned int ppc64_standard_linkage2_insn[PPC64_STANDARD_LINKAGE2_LEN];
+  unsigned int ppc64_standard_linkage3_insn[PPC64_STANDARD_LINKAGE3_LEN];
+  CORE_ADDR target;
+
+  if (ppc_insns_match_pattern (pc, ppc64_standard_linkage1,
+			       ppc64_standard_linkage1_insn))
+    pc = ppc64_standard_linkage1_target (frame, pc,
+					 ppc64_standard_linkage1_insn);
+  else if (ppc_insns_match_pattern (pc, ppc64_standard_linkage2,
+				    ppc64_standard_linkage2_insn))
+    pc = ppc64_standard_linkage2_target (frame, pc,
+					 ppc64_standard_linkage2_insn);
+  else if (ppc_insns_match_pattern (pc, ppc64_standard_linkage3,
+				    ppc64_standard_linkage3_insn))
+    pc = ppc64_standard_linkage3_target (frame, pc,
+					 ppc64_standard_linkage3_insn);
+  else
+    return 0;
+
+  /* The PLT descriptor will either point to the already resolved target
+     address, or else to a glink stub.  As the latter carry synthetic @plt
+     symbols, find_solib_trampoline_target should be able to resolve them.  */
+  target = find_solib_trampoline_target (frame, pc);
+  return target ? target : pc;
+}
+
+/* Support for convert_from_func_ptr_addr (ARCH, ADDR, TARG) on PPC64
+   GNU/Linux.
+
+   Usually a function pointer's representation is simply the address
+   of the function.  On GNU/Linux on the PowerPC however, a function
+   pointer may be a pointer to a function descriptor.
+
+   For PPC64, a function descriptor is a TOC entry, in a data section,
+   which contains three words: the first word is the address of the
+   function, the second word is the TOC pointer (r2), and the third word
+   is the static chain value.
+
+   Throughout GDB it is currently assumed that a function pointer contains
+   the address of the function, which is not easy to fix.  In addition, the
+   conversion of a function address to a function pointer would
+   require allocation of a TOC entry in the inferior's memory space,
+   with all its drawbacks.  To be able to call C++ virtual methods in
+   the inferior (which are called via function pointers),
+   find_function_addr uses this function to get the function address
+   from a function pointer.
+
+   If ADDR points at what is clearly a function descriptor, transform
+   it into the address of the corresponding function, if needed.  Be
+   conservative, otherwise GDB will do the transformation on any
+   random addresses such as occur when there is no symbol table.  */
+
+CORE_ADDR
+ppc64_convert_from_func_ptr_addr (struct gdbarch *gdbarch,
+					CORE_ADDR addr,
+					struct target_ops *targ)
+{
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  struct target_section *s = target_section_by_addr (targ, addr);
+
+  /* Check if ADDR points to a function descriptor.  */
+  if (s && strcmp (s->the_bfd_section->name, ".opd") == 0)
+    {
+      /* There may be relocations that need to be applied to the .opd 
+	 section.  Unfortunately, this function may be called at a time
+	 where these relocations have not yet been performed -- this can
+	 happen for example shortly after a library has been loaded with
+	 dlopen, but ld.so has not yet applied the relocations.
+
+	 To cope with both the case where the relocation has been applied,
+	 and the case where it has not yet been applied, we do *not* read
+	 the (maybe) relocated value from target memory, but we instead
+	 read the non-relocated value from the BFD, and apply the relocation
+	 offset manually.
+
+	 This makes the assumption that all .opd entries are always relocated
+	 by the same offset the section itself was relocated.  This should
+	 always be the case for GNU/Linux executables and shared libraries.
+	 Note that other kind of object files (e.g. those added via
+	 add-symbol-files) will currently never end up here anyway, as this
+	 function accesses *target* sections only; only the main exec and
+	 shared libraries are ever added to the target.  */
+
+      gdb_byte buf[8];
+      int res;
+
+      res = bfd_get_section_contents (s->bfd, s->the_bfd_section,
+				      &buf, addr - s->addr, 8);
+      if (res != 0)
+	return extract_unsigned_integer (buf, 8, byte_order)
+		- bfd_section_vma (s->bfd, s->the_bfd_section) + s->addr;
+   }
+
+  return addr;
+}
diff --git a/gdb/ppc64-tdep.h b/gdb/ppc64-tdep.h
new file mode 100644
index 00000000000..c4c9d99455a
--- /dev/null
+++ b/gdb/ppc64-tdep.h
@@ -0,0 +1,34 @@
+/* Common target-dependent code for ppc64.
+
+   Copyright (C) 1986-2013 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/>.  */
+
+#ifndef PPC64_TDEP_H
+#define PPC64_TDEP_H
+
+struct gdbarch;
+struct frame_info;
+struct target_ops;
+
+extern CORE_ADDR ppc64_skip_trampoline_code (struct frame_info *frame,
+					     CORE_ADDR pc);
+
+extern CORE_ADDR ppc64_convert_from_func_ptr_addr (struct gdbarch *gdbarch,
+						   CORE_ADDR addr,
+						   struct target_ops *targ);
+
+#endif /* PPC64_TDEP_H  */