X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Falphanbsd-tdep.c;h=bc1738595a671aebb5ac6405b636c58ed676013c;hb=0f4d39d53de83e8b4ecf0eb1fa85182074b04bc5;hp=d10a3cab1597762c4488948f7456abd48536969d;hpb=ea5bc2a6064698fb3a18f816e1d8f11baa74180a;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/alphanbsd-tdep.c b/gdb/alphanbsd-tdep.c
index d10a3cab15..bc1738595a 100644
--- a/gdb/alphanbsd-tdep.c
+++ b/gdb/alphanbsd-tdep.c
@@ -1,12 +1,14 @@
-/* Target-dependent code for NetBSD/Alpha.
-   Copyright 2002 Free Software Foundation, Inc.
+/* Target-dependent code for NetBSD/alpha.
+
+   Copyright (C) 2002-2004, 2006-2012 Free Software Foundation, Inc.
+
    Contributed by Wasabi Systems, 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,
@@ -15,27 +17,97 @@
    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., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
+#include "frame.h"
 #include "gdbcore.h"
+#include "osabi.h"
 #include "regcache.h"
+#include "regset.h"
 #include "value.h"
 
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
 #include "alpha-tdep.h"
 #include "alphabsd-tdep.h"
 #include "nbsd-tdep.h"
+#include "solib-svr4.h"
+#include "target.h"
+
+/* Core file support.  */
+
+/* Even though NetBSD/alpha used ELF since day one, it used the
+   traditional a.out-style core dump format before NetBSD 1.6.  */
+
+/* Sizeof `struct reg' in <machine/reg.h>.  */
+#define ALPHANBSD_SIZEOF_GREGS	(32 * 8)
+
+/* Sizeof `struct fpreg' in <machine/reg.h.  */
+#define ALPHANBSD_SIZEOF_FPREGS	((32 * 8) + 8)
+
+/* Supply register REGNUM from the buffer specified by FPREGS and LEN
+   in the floating-point register set REGSET to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+static void
+alphanbsd_supply_fpregset (const struct regset *regset,
+			   struct regcache *regcache,
+			   int regnum, const void *fpregs, size_t len)
+{
+  const gdb_byte *regs = fpregs;
+  int i;
+
+  gdb_assert (len >= ALPHANBSD_SIZEOF_FPREGS);
+
+  for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; i++)
+    {
+      if (regnum == i || regnum == -1)
+	regcache_raw_supply (regcache, i, regs + (i - ALPHA_FP0_REGNUM) * 8);
+    }
+
+  if (regnum == ALPHA_FPCR_REGNUM || regnum == -1)
+    regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, regs + 32 * 8);
+}
+
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+   in the general-purpose register set REGSET to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+static void
+alphanbsd_supply_gregset (const struct regset *regset,
+			  struct regcache *regcache,
+			  int regnum, const void *gregs, size_t len)
+{
+  const gdb_byte *regs = gregs;
+  int i;
+
+  gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
+
+  for (i = 0; i < ALPHA_ZERO_REGNUM; i++)
+    {
+      if (regnum == i || regnum == -1)
+	regcache_raw_supply (regcache, i, regs + i * 8);
+    }
+
+  if (regnum == ALPHA_PC_REGNUM || regnum == -1)
+    regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
+}
+
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+   in the general-purpose register set REGSET to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
 
 static void
-fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
-                      CORE_ADDR ignore)
+alphanbsd_aout_supply_gregset (const struct regset *regset,
+			       struct regcache *regcache,
+			       int regnum, const void *gregs, size_t len)
 {
-  char *regs, *fpregs;
-  int regno;
+  const gdb_byte *regs = gregs;
+  int i;
 
-  /* Table to map a gdb register number to a trapframe register index.  */
+  /* Table to map a GDB register number to a trapframe register index.  */
   static const int regmap[] =
   {
      0,   1,   2,   3,
@@ -47,76 +119,70 @@ fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
     21,  22,  23,  24,
     25,  29,  26
   };
-#define SIZEOF_TRAPFRAME (33 * 8)
-
-  /* We get everything from one section.  */
-  if (which != 0)
-    return;
 
-  regs = core_reg_sect;
-  fpregs = core_reg_sect + SIZEOF_TRAPFRAME;
+  gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
 
-  if (core_reg_size < (SIZEOF_TRAPFRAME + SIZEOF_STRUCT_FPREG))
+  for (i = 0; i < ARRAY_SIZE(regmap); i++)
     {
-      warning ("Wrong size register set in core file.");
-      return;
+      if (regnum == i || regnum == -1)
+	regcache_raw_supply (regcache, i, regs + regmap[i] * 8);
     }
 
-  /* Integer registers.  */
-  for (regno = 0; regno < ALPHA_ZERO_REGNUM; regno++)
-    supply_register (regno, regs + (regmap[regno] * 8));
-  supply_register (ALPHA_ZERO_REGNUM, NULL);
-  supply_register (FP_REGNUM, NULL);
-  supply_register (PC_REGNUM, regs + (28 * 8));
+  if (regnum == ALPHA_PC_REGNUM || regnum == -1)
+    regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
 
-  /* Floating point registers.  */
-  alphabsd_supply_fpreg (fpregs, -1);
-}
-
-static void
-fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which,
-                         CORE_ADDR ignore)
-{
-  switch (which)
+  if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
     {
-    case 0:  /* Integer registers.  */
-      if (core_reg_size != SIZEOF_STRUCT_REG)
-	warning ("Wrong size register set in core file.");
-      else
-	alphabsd_supply_reg (core_reg_sect, -1);
-      break;
-
-    case 2:  /* Floating point registers.  */
-      if (core_reg_size != SIZEOF_STRUCT_FPREG)
-	warning ("Wrong size FP register set in core file.");
-      else
-	alphabsd_supply_fpreg (core_reg_sect, -1);
-      break;
-
-    default:
-      /* Don't know what kind of register request this is; just ignore it.  */
-      break;
+      regs += ALPHANBSD_SIZEOF_GREGS;
+      len -= ALPHANBSD_SIZEOF_GREGS;
+      alphanbsd_supply_fpregset (regset, regcache, regnum, regs, len);
     }
 }
 
-static struct core_fns alphanbsd_core_fns =
+/* NetBSD/alpha register sets.  */
+
+static struct regset alphanbsd_gregset =
+{
+  NULL,
+  alphanbsd_supply_gregset
+};
+
+static struct regset alphanbsd_fpregset =
 {
-  bfd_target_unknown_flavour,		/* core_flavour */
-  default_check_format,			/* check_format */
-  default_core_sniffer,			/* core_sniffer */
-  fetch_core_registers,			/* core_read_registers */
-  NULL					/* next */
+  NULL,
+  alphanbsd_supply_fpregset
 };
 
-static struct core_fns alphanbsd_elfcore_fns =
+static struct regset alphanbsd_aout_gregset =
 {
-  bfd_target_elf_flavour,		/* core_flavour */
-  default_check_format,			/* check_format */
-  default_core_sniffer,			/* core_sniffer */
-  fetch_elfcore_registers,		/* core_read_registers */
-  NULL					/* next */
+  NULL,
+  alphanbsd_aout_supply_gregset
 };
 
+/* Return the appropriate register set for the core section identified
+   by SECT_NAME and SECT_SIZE.  */
+
+const struct regset *
+alphanbsd_regset_from_core_section (struct gdbarch *gdbarch,
+				    const char *sect_name, size_t sect_size)
+{
+  if (strcmp (sect_name, ".reg") == 0 && sect_size >= ALPHANBSD_SIZEOF_GREGS)
+    {
+      if (sect_size >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
+	return &alphanbsd_aout_gregset;
+      else
+	return &alphanbsd_gregset;
+    }
+
+  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ALPHANBSD_SIZEOF_FPREGS)
+    return &alphanbsd_fpregset;
+
+  return NULL;
+}
+
+
+/* Signal trampolines.  */
+
 /* Under NetBSD/alpha, signal handler invocations can be identified by the
    designated code sequence that is used to return from a signal handler.
    In particular, the return address of a signal handler points to the
@@ -133,29 +199,29 @@ static struct core_fns alphanbsd_elfcore_fns =
    sequence and can then check whether we really are executing in the
    signal trampoline.  If not, -1 is returned, otherwise the offset from the
    start of the return sequence is returned.  */
-static const unsigned int sigtramp_retcode[] =
+static const unsigned char sigtramp_retcode[] =
 {
-  0xa61e0000,		/* ldq a0, 0(sp) */
-  0x23de0010,		/* lda sp, 16(sp) */
-  0x201f0127,		/* lda v0, 295(zero) */
-  0x00000083,		/* call_pal callsys */
+  0x00, 0x00, 0x1e, 0xa6,	/* ldq a0, 0(sp) */
+  0x10, 0x00, 0xde, 0x23,	/* lda sp, 16(sp) */
+  0x27, 0x01, 0x1f, 0x20,	/* lda v0, 295(zero) */
+  0x83, 0x00, 0x00, 0x00,	/* call_pal callsys */
 };
-#define	RETCODE_NWORDS \
-  (sizeof (sigtramp_retcode) / sizeof (sigtramp_retcode[0]))
+#define RETCODE_NWORDS		4
+#define RETCODE_SIZE		(RETCODE_NWORDS * 4)
 
-LONGEST
-alphanbsd_sigtramp_offset (CORE_ADDR pc)
+static LONGEST
+alphanbsd_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc)
 {
-  unsigned int ret[4], w;
+  unsigned char ret[RETCODE_SIZE], w[4];
   LONGEST off;
   int i;
 
-  if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
+  if (target_read_memory (pc, (char *) w, 4) != 0)
     return -1;
 
   for (i = 0; i < RETCODE_NWORDS; i++)
     {
-      if (w == sigtramp_retcode[i])
+      if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0)
 	break;
     }
   if (i == RETCODE_NWORDS)
@@ -164,20 +230,34 @@ alphanbsd_sigtramp_offset (CORE_ADDR pc)
   off = i * 4;
   pc -= off;
 
-  if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
+  if (target_read_memory (pc, (char *) ret, sizeof (ret)) != 0)
     return -1;
 
-  if (memcmp (ret, sigtramp_retcode, sizeof (sigtramp_retcode)) == 0)
+  if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0)
     return off;
 
   return -1;
 }
 
 static int
-alphanbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
+alphanbsd_pc_in_sigtramp (struct gdbarch *gdbarch,
+		 	  CORE_ADDR pc, const char *func_name)
+{
+  return (nbsd_pc_in_sigtramp (pc, func_name)
+	  || alphanbsd_sigtramp_offset (gdbarch, pc) >= 0);
+}
+
+static CORE_ADDR
+alphanbsd_sigcontext_addr (struct frame_info *frame)
 {
-  return (alphanbsd_sigtramp_offset (pc) >= 0);
+  /* FIXME: This is not correct for all versions of NetBSD/alpha.
+     We will probably need to disassemble the trampoline to figure
+     out which trampoline frame type we have.  */
+  if (!get_next_frame (frame))
+    return 0;
+  return get_frame_base (get_next_frame (frame));
 }
+
 
 static void
 alphanbsd_init_abi (struct gdbarch_info info,
@@ -185,26 +265,52 @@ alphanbsd_init_abi (struct gdbarch_info info,
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
-  set_gdbarch_pc_in_sigtramp (gdbarch, alphanbsd_pc_in_sigtramp);
+  /* Hook into the DWARF CFI frame unwinder.  */
+  alpha_dwarf2_init_abi (info, gdbarch);
+
+  /* Hook into the MDEBUG frame unwinder.  */
+  alpha_mdebug_init_abi (info, gdbarch);
 
   /* NetBSD/alpha does not provide single step support via ptrace(2); we
      must use software single-stepping.  */
   set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
 
-  set_solib_svr4_fetch_link_map_offsets (gdbarch,
-                                 nbsd_lp64_solib_svr4_fetch_link_map_offsets);
+  /* NetBSD/alpha has SVR4-style shared libraries.  */
+  set_solib_svr4_fetch_link_map_offsets
+    (gdbarch, svr4_lp64_fetch_link_map_offsets);
 
   tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
+  tdep->pc_in_sigtramp = alphanbsd_pc_in_sigtramp;
+  tdep->sigcontext_addr = alphanbsd_sigcontext_addr;
 
   tdep->jb_pc = 2;
   tdep->jb_elt_size = 8;
+
+  set_gdbarch_regset_from_core_section
+    (gdbarch, alphanbsd_regset_from_core_section);
+}
+
+
+static enum gdb_osabi
+alphanbsd_core_osabi_sniffer (bfd *abfd)
+{
+  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
+    return GDB_OSABI_NETBSD_ELF;
+
+  return GDB_OSABI_UNKNOWN;
 }
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_alphanbsd_tdep (void);
 
 void
 _initialize_alphanbsd_tdep (void)
 {
-  alpha_gdbarch_register_os_abi (ALPHA_ABI_NETBSD, alphanbsd_init_abi);
+  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
+  gdbarch_register_osabi_sniffer (bfd_arch_alpha, bfd_target_unknown_flavour,
+                                  alphanbsd_core_osabi_sniffer);
 
-  add_core_fns (&alphanbsd_core_fns);
-  add_core_fns (&alphanbsd_elfcore_fns);
+  gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF,
+                          alphanbsd_init_abi);
 }