Initial revision

1 files changed, 297 insertions, 0 deletions

diff --git a/gdb/alpha-nat.c b/gdb/alpha-nat.c
new file mode 100644
index 00000000000..59bd0d887e5
--- /dev/null
+++ b/gdb/alpha-nat.c
@@ -0,0 +1,297 @@
+/* Low level Alpha interface, for GDB when running native.
+   Copyright 1993, 1995, 1996, 1998 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.  */
+
+#include "defs.h"
+#include "inferior.h"
+#include "gdbcore.h"
+#include "target.h"
+#include <sys/ptrace.h>
+#ifdef __linux__
+# include <asm/reg.h>
+# include <alpha/ptrace.h>
+#else
+# include <machine/reg.h>
+#endif
+#include <sys/user.h>
+
+/* Prototypes for local functions. */
+
+static void fetch_osf_core_registers PARAMS ((char *,
+					      unsigned, int, CORE_ADDR));
+static void fetch_elf_core_registers PARAMS ((char *,
+					      unsigned, int, CORE_ADDR));
+
+/* 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_osf_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
+     char *core_reg_sect;
+     unsigned core_reg_size;
+     int which;
+     CORE_ADDR reg_addr;
+{
+  register int regno;
+  register int addr;
+  int bad_reg = -1;
+
+  /* Table to map a gdb regnum to an index in the core register section.
+     The floating point register values are garbage in OSF/1.2 core files.  */
+  static int core_reg_mapping[NUM_REGS] =
+  {
+#define EFL (EF_SIZE / 8)
+	EF_V0,	EF_T0,	EF_T1,	EF_T2,	EF_T3,	EF_T4,	EF_T5,	EF_T6,
+	EF_T7,	EF_S0,	EF_S1,	EF_S2,	EF_S3,	EF_S4,	EF_S5,	EF_S6,
+	EF_A0,	EF_A1,	EF_A2,	EF_A3,	EF_A4,	EF_A5,	EF_T8,	EF_T9,
+	EF_T10,	EF_T11,	EF_RA,	EF_T12,	EF_AT,	EF_GP,	EF_SP,	-1,
+	EFL+0,	EFL+1,	EFL+2,	EFL+3,	EFL+4,	EFL+5,	EFL+6,	EFL+7,
+	EFL+8,	EFL+9,	EFL+10,	EFL+11,	EFL+12,	EFL+13,	EFL+14,	EFL+15,
+	EFL+16,	EFL+17,	EFL+18,	EFL+19,	EFL+20,	EFL+21,	EFL+22,	EFL+23,
+	EFL+24,	EFL+25,	EFL+26,	EFL+27,	EFL+28,	EFL+29,	EFL+30,	EFL+31,
+	EF_PC,	-1
+  };
+  static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
+
+  for (regno = 0; regno < NUM_REGS; regno++)
+    {
+      if (CANNOT_FETCH_REGISTER (regno))
+	{
+	  supply_register (regno, zerobuf);
+	  continue;
+	}
+      addr = 8 * core_reg_mapping[regno];
+      if (addr < 0 || addr >= core_reg_size)
+	{
+	  if (bad_reg < 0)
+	    bad_reg = regno;
+	}
+      else
+	{
+	  supply_register (regno, core_reg_sect + addr);
+	}
+    }
+  if (bad_reg >= 0)
+    {
+      error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
+    }
+}
+
+static void
+fetch_elf_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
+     char *core_reg_sect;
+     unsigned core_reg_size;
+     int which;
+     CORE_ADDR reg_addr;
+{
+  if (core_reg_size < 32*8)
+    {
+      error ("Core file register section too small (%u bytes).", core_reg_size);
+      return;
+    }
+
+  if (which == 2)
+    {
+      /* The FPU Registers.  */
+      memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31*8);
+      memset (&registers[REGISTER_BYTE (FP0_REGNUM+31)], 0, 8);
+      memset (&register_valid[FP0_REGNUM], 1, 32);
+    }
+  else
+    {
+      /* The General Registers.  */
+      memcpy (&registers[REGISTER_BYTE (V0_REGNUM)], core_reg_sect, 31*8);
+      memcpy (&registers[REGISTER_BYTE (PC_REGNUM)], core_reg_sect+31*8, 8);
+      memset (&registers[REGISTER_BYTE (ZERO_REGNUM)], 0, 8);
+      memset (&register_valid[V0_REGNUM], 1, 32);
+      register_valid[PC_REGNUM] = 1;
+    }
+}
+
+
+/* Map gdb internal register number to a ptrace ``address''.
+   These ``addresses'' are defined in <sys/ptrace.h> */
+
+#define REGISTER_PTRACE_ADDR(regno) \
+   (regno < FP0_REGNUM ? 	GPR_BASE + (regno) \
+  : regno == PC_REGNUM ?	PC	\
+  : regno >= FP0_REGNUM ?	FPR_BASE + ((regno) - FP0_REGNUM) \
+  : 0)
+
+/* Return the ptrace ``address'' of register REGNO. */
+
+CORE_ADDR
+register_addr (regno, blockend)
+     int regno;
+     CORE_ADDR blockend;
+{
+  return REGISTER_PTRACE_ADDR (regno);
+}
+
+int
+kernel_u_size ()
+{
+  return (sizeof (struct user));
+}
+
+#if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T)
+#include <sys/procfs.h>
+
+/*
+ * See the comment in m68k-tdep.c regarding the utility of these functions.
+ */
+
+void 
+supply_gregset (gregsetp)
+     gregset_t *gregsetp;
+{
+  register int regi;
+  register long *regp = ALPHA_REGSET_BASE (gregsetp);
+  static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
+
+  for (regi = 0; regi < 31; regi++)
+    supply_register (regi, (char *)(regp + regi));
+
+  supply_register (PC_REGNUM, (char *)(regp + 31));
+
+  /* Fill inaccessible registers with zero.  */
+  supply_register (ZERO_REGNUM, zerobuf);
+  supply_register (FP_REGNUM, zerobuf);
+}
+
+void
+fill_gregset (gregsetp, regno)
+     gregset_t *gregsetp;
+     int regno;
+{
+  int regi;
+  register long *regp = ALPHA_REGSET_BASE (gregsetp);
+
+  for (regi = 0; regi < 31; regi++)
+    if ((regno == -1) || (regno == regi))
+      *(regp + regi) = *(long *) &registers[REGISTER_BYTE (regi)];
+
+  if ((regno == -1) || (regno == PC_REGNUM))
+    *(regp + 31) = *(long *) &registers[REGISTER_BYTE (PC_REGNUM)];
+}
+
+/*
+ * Now we do the same thing for floating-point registers.
+ * Again, see the comments in m68k-tdep.c.
+ */
+
+void
+supply_fpregset (fpregsetp)
+     fpregset_t *fpregsetp;
+{
+  register int regi;
+  register long *regp = ALPHA_REGSET_BASE (fpregsetp);
+
+  for (regi = 0; regi < 32; regi++)
+    supply_register (regi + FP0_REGNUM, (char *)(regp + regi));
+}
+
+void
+fill_fpregset (fpregsetp, regno)
+     fpregset_t *fpregsetp;
+     int regno;
+{
+  int regi;
+  register long *regp = ALPHA_REGSET_BASE (fpregsetp);
+
+  for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
+    {
+      if ((regno == -1) || (regno == regi))
+	{
+	  *(regp + regi - FP0_REGNUM) =
+	    *(long *) &registers[REGISTER_BYTE (regi)];
+	}
+    }
+}
+#endif
+
+
+/* Register that we are able to handle alpha core file formats. */
+
+static struct core_fns alpha_osf_core_fns =
+{
+  /* This really is bfd_target_unknown_flavour.  */
+
+  bfd_target_unknown_flavour,
+  fetch_osf_core_registers,
+  NULL
+};
+
+static struct core_fns alpha_elf_core_fns =
+{
+  bfd_target_elf_flavour,
+  fetch_elf_core_registers,
+  NULL
+};
+
+void
+_initialize_core_alpha ()
+{
+  add_core_fns (&alpha_osf_core_fns);
+  add_core_fns (&alpha_elf_core_fns);
+}