Initial revision

1 files changed, 328 insertions, 0 deletions

diff --git a/gdb/sparc-nat.c b/gdb/sparc-nat.c
new file mode 100644
index 00000000000..3f5f8bf748c
--- /dev/null
+++ b/gdb/sparc-nat.c
@@ -0,0 +1,328 @@
+/* Functions specific to running gdb native on a SPARC running SunOS4.
+   Copyright 1989, 1992, 1993, 1994, 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.  */
+
+#include "defs.h"
+#include "inferior.h"
+#include "target.h"
+#include "gdbcore.h"
+
+#include <signal.h>
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#ifdef __linux__
+#include <asm/reg.h>
+#else
+#include <machine/reg.h>
+#endif
+#include <sys/user.h>
+
+/* We don't store all registers immediately when requested, since they
+   get sent over in large chunks anyway.  Instead, we accumulate most
+   of the changes and send them over once.  "deferred_stores" keeps
+   track of which sets of registers we have locally-changed copies of,
+   so we only need send the groups that have changed.  */
+
+#define	INT_REGS	1
+#define	STACK_REGS	2
+#define	FP_REGS		4
+
+static void
+fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR));
+
+/* Fetch one or more registers from the inferior.  REGNO == -1 to get
+   them all.  We actually fetch more than requested, when convenient,
+   marking them as valid so we won't fetch them again.  */
+
+void
+fetch_inferior_registers (regno)
+     int regno;
+{
+  struct regs inferior_registers;
+  struct fp_status inferior_fp_registers;
+  int i;
+
+  /* We should never be called with deferred stores, because a prerequisite
+     for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh.  */
+  if (deferred_stores) abort();
+
+  DO_DEFERRED_STORES;
+
+  /* Global and Out regs are fetched directly, as well as the control
+     registers.  If we're getting one of the in or local regs,
+     and the stack pointer has not yet been fetched,
+     we have to do that first, since they're found in memory relative
+     to the stack pointer.  */
+  if (regno < O7_REGNUM  /* including -1 */
+      || regno >= Y_REGNUM
+      || (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
+    {
+      if (0 != ptrace (PTRACE_GETREGS, inferior_pid,
+		       (PTRACE_ARG3_TYPE) &inferior_registers, 0))
+	perror("ptrace_getregs");
+      
+      registers[REGISTER_BYTE (0)] = 0;
+      memcpy (&registers[REGISTER_BYTE (1)], &inferior_registers.r_g1,
+	      15 * REGISTER_RAW_SIZE (G0_REGNUM));
+      *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps; 
+      *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
+      *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
+      *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
+
+      for (i = G0_REGNUM; i <= O7_REGNUM; i++)
+	register_valid[i] = 1;
+      register_valid[Y_REGNUM] = 1;
+      register_valid[PS_REGNUM] = 1;
+      register_valid[PC_REGNUM] = 1;
+      register_valid[NPC_REGNUM] = 1;
+      /* If we don't set these valid, read_register_bytes() rereads
+	 all the regs every time it is called!  FIXME.  */
+      register_valid[WIM_REGNUM] = 1;	/* Not true yet, FIXME */
+      register_valid[TBR_REGNUM] = 1;	/* Not true yet, FIXME */
+      register_valid[CPS_REGNUM] = 1;	/* Not true yet, FIXME */
+    }
+
+  /* Floating point registers */
+  if (regno == -1 ||
+      regno == FPS_REGNUM ||
+      (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
+    {
+      if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid,
+		       (PTRACE_ARG3_TYPE) &inferior_fp_registers,
+		       0))
+	    perror("ptrace_getfpregs");
+      memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
+	      sizeof inferior_fp_registers.fpu_fr);
+      memcpy (&registers[REGISTER_BYTE (FPS_REGNUM)],
+	     &inferior_fp_registers.Fpu_fsr,
+	     sizeof (FPU_FSR_TYPE));
+      for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
+	register_valid[i] = 1;
+      register_valid[FPS_REGNUM] = 1;
+    }
+
+  /* These regs are saved on the stack by the kernel.  Only read them
+     all (16 ptrace calls!) if we really need them.  */
+  if (regno == -1)
+    {
+      target_read_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
+		          &registers[REGISTER_BYTE (L0_REGNUM)],
+			  16*REGISTER_RAW_SIZE (L0_REGNUM));
+      for (i = L0_REGNUM; i <= I7_REGNUM; i++)
+	register_valid[i] = 1;
+    }
+  else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
+    {
+      CORE_ADDR sp = *(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)];
+      i = REGISTER_BYTE (regno);
+      if (register_valid[regno])
+	printf_unfiltered("register %d valid and read\n", regno);
+      target_read_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
+			  &registers[i], REGISTER_RAW_SIZE (regno));
+      register_valid[regno] = 1;
+    }
+}
+
+/* Store our register values back into the inferior.
+   If REGNO is -1, do this for all registers.
+   Otherwise, REGNO specifies which register (so we can save time).  */
+
+void
+store_inferior_registers (regno)
+     int regno;
+{
+  struct regs inferior_registers;
+  struct fp_status inferior_fp_registers;
+  int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
+
+  /* First decide which pieces of machine-state we need to modify.  
+     Default for regno == -1 case is all pieces.  */
+  if (regno >= 0)
+    if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
+      {
+	wanna_store = FP_REGS;
+      }
+    else 
+      {
+	if (regno == SP_REGNUM)
+	  wanna_store = INT_REGS + STACK_REGS;
+	else if (regno < L0_REGNUM || regno > I7_REGNUM)
+	  wanna_store = INT_REGS;
+	else if (regno == FPS_REGNUM)
+	  wanna_store = FP_REGS;
+	else
+	  wanna_store = STACK_REGS;
+      }
+
+  /* See if we're forcing the stores to happen now, or deferring. */
+  if (regno == -2)
+    {
+      wanna_store = deferred_stores;
+      deferred_stores = 0;
+    }
+  else
+    {
+      if (wanna_store == STACK_REGS)
+	{
+	  /* Fall through and just store one stack reg.  If we deferred
+	     it, we'd have to store them all, or remember more info.  */
+	}
+      else
+	{
+	  deferred_stores |= wanna_store;
+	  return;
+	}
+    }
+
+  if (wanna_store & STACK_REGS)
+    {
+      CORE_ADDR sp = *(CORE_ADDR *)&registers[REGISTER_BYTE (SP_REGNUM)];
+
+      if (regno < 0 || regno == SP_REGNUM)
+	{
+	  if (!register_valid[L0_REGNUM+5]) abort();
+	  target_write_memory (sp, 
+			       &registers[REGISTER_BYTE (L0_REGNUM)],
+			       16*REGISTER_RAW_SIZE (L0_REGNUM));
+	}
+      else
+	{
+	  if (!register_valid[regno]) abort();
+	  target_write_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
+			       &registers[REGISTER_BYTE (regno)],
+			       REGISTER_RAW_SIZE (regno));
+	}
+	
+    }
+
+  if (wanna_store & INT_REGS)
+    {
+      if (!register_valid[G1_REGNUM]) abort();
+
+      memcpy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (G1_REGNUM)],
+	      15 * REGISTER_RAW_SIZE (G1_REGNUM));
+
+      inferior_registers.r_ps =
+	*(int *)&registers[REGISTER_BYTE (PS_REGNUM)];
+      inferior_registers.r_pc =
+	*(int *)&registers[REGISTER_BYTE (PC_REGNUM)];
+      inferior_registers.r_npc =
+	*(int *)&registers[REGISTER_BYTE (NPC_REGNUM)];
+      inferior_registers.r_y =
+	*(int *)&registers[REGISTER_BYTE (Y_REGNUM)];
+
+      if (0 != ptrace (PTRACE_SETREGS, inferior_pid,
+		       (PTRACE_ARG3_TYPE) &inferior_registers, 0))
+	perror("ptrace_setregs");
+    }
+
+  if (wanna_store & FP_REGS)
+    {
+      if (!register_valid[FP0_REGNUM+9]) abort();
+      memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
+	      sizeof inferior_fp_registers.fpu_fr);
+      memcpy (&inferior_fp_registers.Fpu_fsr, 
+	      &registers[REGISTER_BYTE (FPS_REGNUM)], sizeof (FPU_FSR_TYPE));
+      if (0 !=
+	 ptrace (PTRACE_SETFPREGS, inferior_pid,
+		 (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
+	 perror("ptrace_setfpregs");
+    }
+}
+
+
+static void
+fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
+  char *core_reg_sect;
+  unsigned core_reg_size;
+  int which;
+  CORE_ADDR ignore;	/* reg addr, unused in this version */
+{
+
+  if (which == 0) {
+
+    /* Integer registers */
+
+#define gregs ((struct regs *)core_reg_sect)
+    /* G0 *always* holds 0.  */
+    *(int *)&registers[REGISTER_BYTE (0)] = 0;
+
+    /* The globals and output registers.  */
+    memcpy (&registers[REGISTER_BYTE (G1_REGNUM)], &gregs->r_g1, 
+	    15 * REGISTER_RAW_SIZE (G1_REGNUM));
+    *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
+    *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
+    *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
+    *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
+
+    /* My best guess at where to get the locals and input
+       registers is exactly where they usually are, right above
+       the stack pointer.  If the core dump was caused by a bus error
+       from blowing away the stack pointer (as is possible) then this
+       won't work, but it's worth the try. */
+    {
+      int sp;
+
+      sp = *(int *)&registers[REGISTER_BYTE (SP_REGNUM)];
+      if (0 != target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)], 
+			  16 * REGISTER_RAW_SIZE (L0_REGNUM)))
+	{
+	  /* fprintf_unfiltered so user can still use gdb */
+	  fprintf_unfiltered (gdb_stderr,
+		   "Couldn't read input and local registers from core file\n");
+	}
+    }
+  } else if (which == 2) {
+
+    /* Floating point registers */
+
+#define fpuregs  ((struct fpu *) core_reg_sect)
+    if (core_reg_size >= sizeof (struct fpu))
+      {
+	memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], fpuregs->fpu_regs,
+		sizeof (fpuregs->fpu_regs));
+	memcpy (&registers[REGISTER_BYTE (FPS_REGNUM)], &fpuregs->fpu_fsr,
+		sizeof (FPU_FSR_TYPE));
+      }
+    else
+      fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
+  }
+}
+
+int
+kernel_u_size ()
+{
+  return (sizeof (struct user));
+}
+
+
+/* Register that we are able to handle sparc core file formats.
+   FIXME: is this really bfd_target_unknown_flavour? */
+
+static struct core_fns sparc_core_fns =
+{
+  bfd_target_unknown_flavour,
+  fetch_core_registers,
+  NULL
+};
+
+void
+_initialize_core_sparc ()
+{
+  add_core_fns (&sparc_core_fns);
+}