Merge alpha support from src/gnu/dist. Doesn't necessarily build or work

yet, but enough to get "configure" working at this stage.

gnu/dist/toolchain/gdb/alphanbsd-nat.c

@@ -0,0 +1,246 @@
+/* Low level Alpha interface, for GDB when running native.
+   Copyright 1993, 1995, 1996 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 2 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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+This file was developed by Gordon W. Ross <gwr@netbsd.org>
+as a derivation from alpha-nat.c and m68knbsd-nat.c.  */
+
+#include "defs.h"
+#include "inferior.h"
+#include "gdbcore.h"
+#include "target.h"
+#include <sys/ptrace.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/proc.h>
+#include <machine/reg.h>
+#include <machine/frame.h>
+#include <machine/pcb.h>
+#include <string.h>
+
+/* Size of elements in jmpbuf */
+
+#define JB_ELEMENT_SIZE 8
+
+/* The definition for JB_PC in machine/reg.h is wrong.
+   And we can't get at the correct definition in setjmp.h as it is
+   not always available (eg. if _POSIX_SOURCE is defined which is the
+   default). As the defintion is unlikely to change (see comment
+   in <setjmp.h>, define the correct value here.  */
+
+#undef JB_PC
+#define JB_PC 2
+
+/* Figure out where the longjmp will land.
+   We expect the first arg to be a pointer to the jmp_buf structure from which
+   we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.
+   This routine returns true on success. */
+
+int
+get_longjmp_target (pc)
+     CORE_ADDR *pc;
+{
+  CORE_ADDR jb_addr;
+  char raw_buffer[MAX_REGISTER_RAW_SIZE];
+
+  jb_addr = read_register(A0_REGNUM);
+
+  if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer,
+			 sizeof(CORE_ADDR)))
+    return 0;
+
+  *pc = extract_address (raw_buffer, sizeof(CORE_ADDR));
+  return 1;
+}
+
+/* Extract the register values out of the core file and store
+   them where `read_register' will find them.
+
+   CORE_REG_SECT points to the register values themselves, read into memory.
+   CORE_REG_SIZE is the size of that area.
+   WHICH says which set of registers we are handling (0 = int, 2 = float
+         on machines where they are discontiguous).
+   REG_ADDR is the offset from u.u_ar0 to the register values relative to
+            core_reg_sect.  This is used with old-fashioned core files to
+	    locate the registers in a large upage-plus-stack ".reg" section.
+	    Original upage address X is at location core_reg_sect+x+reg_addr.
+ */
+
+static void
+fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
+     char *core_reg_sect;
+     unsigned core_reg_size;
+     int which;
+     unsigned reg_addr;
+{
+  struct md_coredump *core_reg;
+  struct trapframe *tf;
+  struct fpreg *fs;
+  register int regnum;
+
+  /* Table to map a gdb regnum to an index in the trapframe regs. */
+  static int core_reg_mapping[ZERO_REGNUM] = {
+    FRAME_V0,  FRAME_T0,  FRAME_T1,  FRAME_T2,
+    FRAME_T3,  FRAME_T4,  FRAME_T5,  FRAME_T6,
+    FRAME_T7,  FRAME_S0,  FRAME_S1,  FRAME_S2,
+    FRAME_S3,  FRAME_S4,  FRAME_S5,  FRAME_S6,
+    FRAME_A0,  FRAME_A1,  FRAME_A2,  FRAME_A3,
+    FRAME_A4,  FRAME_A5,  FRAME_T8,  FRAME_T9,
+    FRAME_T10, FRAME_T11, FRAME_RA,  FRAME_T12,
+    FRAME_AT,  FRAME_GP,  FRAME_SP };
+
+  /* We get everything from the .reg section. */
+  if (which != 0)
+    return;
+
+  core_reg = (struct md_coredump *)core_reg_sect;
+  tf = &core_reg->md_tf;
+  fs = &core_reg->md_fpstate;
+
+  if (core_reg_size < sizeof(*core_reg)) {
+    fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n");
+    return;
+  }
+
+  /* Integer registers */
+  for (regnum = 0; regnum < ZERO_REGNUM; regnum++)
+    *(long *) &registers[REGISTER_BYTE (regnum)] = tf->tf_regs[regnum];
+  *(long *) &registers[REGISTER_BYTE (ZERO_REGNUM)] = 0;
+
+  /* Floating point registers */
+  memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
+	  &fs->fpr_regs[0], sizeof(fs->fpr_regs));
+
+  /* Special registers (PC, VFP) */
+  *(long *) &registers[REGISTER_BYTE (PC_REGNUM)] = tf->tf_regs[FRAME_PC];
+  *(long *) &registers[REGISTER_BYTE (FP_REGNUM)] = 0;
+
+  registers_fetched ();
+}
+
+void
+fetch_inferior_registers (regno)
+     int regno;
+{
+  struct reg inferior_registers;
+  struct fpreg inferior_fp_registers;
+
+  /* Integer registers */
+  ptrace (PT_GETREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);
+  /* The PC travels in the R_ZERO slot. */
+  *(long *) &registers[REGISTER_BYTE (PC_REGNUM)] =
+    inferior_registers.r_regs[R_ZERO];
+  inferior_registers.r_regs[R_ZERO] = 0;
+  memcpy (&registers[REGISTER_BYTE (0)],
+	  &inferior_registers.r_regs[0],
+	  sizeof(inferior_registers.r_regs));
+
+  /* Floating point registers */
+  ptrace (PT_GETFPREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0);
+  memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
+	  &inferior_fp_registers.fpr_regs[0],
+	  sizeof(inferior_fp_registers.fpr_regs));
+
+  registers_fetched ();
+}
+
+void
+store_inferior_registers (regno)
+     int regno;
+{
+  struct reg inferior_registers;
+  struct fpreg inferior_fp_registers;
+
+  /* Integer registers */
+  memcpy (&inferior_registers.r_regs[0],
+	  &registers[REGISTER_BYTE (0)],
+	  sizeof(inferior_registers.r_regs));
+  /* The PC travels in the R_ZERO slot. */
+  inferior_registers.r_regs[R_ZERO] =
+    *(long *) &registers[REGISTER_BYTE (PC_REGNUM)];    
+  ptrace (PT_SETREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);
+
+  /* Floating point registers */
+  memcpy (&inferior_fp_registers.fpr_regs[0],
+	  &registers[REGISTER_BYTE (FP0_REGNUM)],
+	  sizeof(inferior_fp_registers.fpr_regs));
+  inferior_fp_registers.fpr_cr = 0;
+  ptrace (PT_SETFPREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0);
+
+  registers_fetched ();
+}
+
+
+/*
+ * kernel_u_size() is not helpful on NetBSD because
+ * the "u" struct is NOT in the core dump file.
+ */
+
+#ifdef  FETCH_KCORE_REGISTERS
+/*
+ * Get registers from a kernel crash dump or live kernel.
+ * Called by kcore-nbsd.c:get_kcore_registers().
+ */
+fetch_kcore_registers (pcbp)
+  struct pcb *pcbp;
+{
+
+  /* First clear out any garbage. */
+  memset(registers, '\0', REGISTER_BYTES);
+
+  /* SP */
+  *(long *) &registers[REGISTER_BYTE (SP_REGNUM)] =
+    pcbp->pcb_hw.apcb_ksp;
+
+  /* S0 through S6 */
+  memcpy (&registers[REGISTER_BYTE (S0_REGNUM)],
+	  &pcbp->pcb_context[0], 7 * sizeof(long));
+
+  /* PC */
+  *(long *) &registers[REGISTER_BYTE (PC_REGNUM)] =
+    pcbp->pcb_context[7];
+
+  registers_fetched ();
+}
+#endif  /* FETCH_KCORE_REGISTERS */
+
+static struct core_fns alphanbsd_core_fns =
+{
+  bfd_target_ecoff_flavour,
+  fetch_core_registers,
+  NULL
+};
+
+static struct core_fns alphanbsd_elf_core_fns =
+{
+  bfd_target_elf_flavour,
+  fetch_core_registers,
+  NULL
+};
+
+void
+_initialize_core_alphanbsd ()
+{
+  add_core_fns (&alphanbsd_core_fns);
+  add_core_fns (&alphanbsd_elf_core_fns);
+}

gnu/dist/toolchain/gdb/config/alpha/nbsd.mh

@@ -0,0 +1,6 @@
+# Host: Alpha running NetBSD
+XDEPFILES= ser-tcp.o
+XM_FILE= xm-nbsd.h
+NAT_FILE= nm-nbsd.h
+NAT_CLIBS= -lkvm
+NATDEPFILES= infptrace.o inftarg.o fork-child.o corelow.o kcore-nbsd.o alphanbsd-nat.o

gnu/dist/toolchain/gdb/config/alpha/nbsd.mt

@@ -0,0 +1,3 @@
+# Target: Alpha running NetBSD
+TDEPFILES= alpha-tdep.o solib.o
+TM_FILE= tm-nbsd.h

gnu/dist/toolchain/gdb/config/alpha/nm-nbsd.h

@@ -0,0 +1,45 @@
+/* Native-dependent definitions for Alpha running NetBSD, for GDB.
+   Copyright (C) 1986, 1987, 1989, 1992, 1995, 1996
+   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 2 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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Need to define this before including the common nm-nbsd.h. */
+#define	SVR4_SHARED_LIBS 1
+#define TARGET_ELF64 1
+
+/* Get generic NetBSD native definitions. */
+#include "nm-nbsd.h"
+#include <machine/alpha_cpu.h>
+
+/* Figure out where the longjmp will land.  We expect that we have just entered
+   longjmp and haven't yet setup the stack frame, so the args are still in the
+   argument regs.  A0_REGNUM points at the jmp_buf structure from which we
+   extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
+   This routine returns true on success */
+
+#define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
+extern int
+get_longjmp_target PARAMS ((CORE_ADDR *));
+
+/* The alpha does not step over a breakpoint, the manpage is lying again.  */
+
+#define CANNOT_STEP_BREAKPOINT /* ??? */
+
+/* NetBSD/alpha has shared libraries.  */
+
+#define GDB_TARGET_HAS_SHARED_LIBS

gnu/dist/toolchain/gdb/config/alpha/tm-alpha.h

@@ -122,6 +122,7 @@ extern CORE_ADDR
 
 #define V0_REGNUM 0		/* Function integer return value */
 #define T7_REGNUM 8		/* Return address register for OSF/1 __add* */
+#define S0_REGNUM 9		/* First callee-saved register */
 #define GCC_FP_REGNUM 15	/* Used by gcc as frame register */
 #define A0_REGNUM 16		/* Loc of first arg during a subr call */
 #define T9_REGNUM 23		/* Return address register for OSF/1 __div* */

gnu/dist/toolchain/gdb/config/alpha/tm-nbsd.h

@@ -0,0 +1,38 @@
+/* Macro definitions for Alpha running under NetBSD.
+   Copyright 1994 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 2 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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef TM_NBSD_H
+#define TM_NBSD_H
+
+#include "alpha/tm-alpha.h"
+#ifndef S0_REGNUM
+#define S0_REGNUM (T7_REGNUM+1)
+#endif
+#include "tm-nbsd.h"
+
+#undef START_INFERIOR_TRAPS_EXPECTED
+#define START_INFERIOR_TRAPS_EXPECTED 2
+
+#undef NO_SINGLE_STEP
+#define NO_SINGLE_STEP
+#undef CANNOT_STEP_BREAKPOINT 
+
+#define	SOLIB_BKPT_NAME		"__start"
+
+#endif /* TM_NBSD_H */

gnu/dist/toolchain/gdb/config/alpha/xm-nbsd.h

@@ -0,0 +1,21 @@
+/* Parameters for execution on a Alpha running NetBSD, for GDB.
+   Copyright 1994 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 2 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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Get generic NetBSD host definitions. */
+#include <xm-nbsd.h>