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-rw-r--r--gdb/i386aix-nat.c362
1 files changed, 362 insertions, 0 deletions
diff --git a/gdb/i386aix-nat.c b/gdb/i386aix-nat.c
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+/* Intel 386 native support.
+ Copyright (C) 1988, 1989, 1991, 1992 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 "frame.h"
+#include "inferior.h"
+#include "language.h"
+#include "gdbcore.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <signal.h>
+#include <sys/user.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include <sys/file.h>
+#include "gdb_stat.h"
+
+#include <stddef.h>
+#include <sys/ptrace.h>
+
+/* Does AIX define this in <errno.h>? */
+extern int errno;
+
+#ifdef HAVE_SYS_REG_H
+#include <sys/reg.h>
+#endif
+
+#include "floatformat.h"
+
+#include "target.h"
+
+static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
+
+
+/* this table must line up with REGISTER_NAMES in tm-i386v.h */
+/* symbols like 'EAX' come from <sys/reg.h> */
+static int regmap[] =
+{
+ EAX, ECX, EDX, EBX,
+ USP, EBP, ESI, EDI,
+ EIP, EFL, CS, SS,
+ DS, ES, FS, GS,
+};
+
+/* blockend is the value of u.u_ar0, and points to the
+ * place where GS is stored
+ */
+
+int
+i386_register_u_addr (blockend, regnum)
+ int blockend;
+ int regnum;
+{
+#if 0
+ /* this will be needed if fp registers are reinstated */
+ /* for now, you can look at them with 'info float'
+ * sys5 wont let you change them with ptrace anyway
+ */
+ if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
+ {
+ int ubase, fpstate;
+ struct user u;
+ ubase = blockend + 4 * (SS + 1) - KSTKSZ;
+ fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
+ return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
+ }
+ else
+#endif
+ return (blockend + 4 * regmap[regnum]);
+
+}
+
+/* The code below only work on the aix ps/2 (i386-ibm-aix) -
+ * mtranle@paris - Sat Apr 11 10:34:12 1992
+ */
+
+struct env387
+{
+ unsigned short control;
+ unsigned short r0;
+ unsigned short status;
+ unsigned short r1;
+ unsigned short tag;
+ unsigned short r2;
+ unsigned long eip;
+ unsigned short code_seg;
+ unsigned short opcode;
+ unsigned long operand;
+ unsigned short operand_seg;
+ unsigned short r3;
+ unsigned char regs[8][10];
+};
+
+static
+print_387_status (status, ep)
+ unsigned short status;
+ struct env387 *ep;
+{
+ int i;
+ int bothstatus;
+ int top;
+ int fpreg;
+ unsigned char *p;
+
+ bothstatus = ((status != 0) && (ep->status != 0));
+ if (status != 0)
+ {
+ if (bothstatus)
+ printf_unfiltered ("u: ");
+ print_387_status_word (status);
+ }
+
+ if (ep->status != 0)
+ {
+ if (bothstatus)
+ printf_unfiltered ("e: ");
+ print_387_status_word (ep->status);
+ }
+
+ print_387_control_word (ep->control);
+ printf_unfiltered ("last exception: ");
+ printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
+ printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
+ printf_unfiltered ("%s; ", local_hex_string(ep->eip));
+ printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
+ printf_unfiltered (":%s\n", local_hex_string(ep->operand));
+
+ top = ((ep->status >> 11) & 7);
+
+ printf_unfiltered ("regno tag msb lsb value\n");
+ for (fpreg = 7; fpreg >= 0; fpreg--)
+ {
+ double val;
+
+ printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
+
+ switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
+ {
+ case 0: printf_unfiltered ("valid "); break;
+ case 1: printf_unfiltered ("zero "); break;
+ case 2: printf_unfiltered ("trap "); break;
+ case 3: printf_unfiltered ("empty "); break;
+ }
+ for (i = 9; i >= 0; i--)
+ printf_unfiltered ("%02x", ep->regs[fpreg][i]);
+
+ i387_to_double ((char *)ep->regs[fpreg], (char *)&val);
+ printf_unfiltered (" %#g\n", val);
+ }
+}
+
+static struct env387 core_env387;
+
+void
+i386_float_info ()
+{
+ struct env387 fps;
+ int fpsaved = 0;
+ /* We need to reverse the order of the registers. Apparently AIX stores
+ the highest-numbered ones first. */
+ struct env387 fps_fixed;
+ int i;
+
+ if (inferior_pid)
+ {
+ char buf[10];
+ unsigned short status;
+
+ ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status));
+ memcpy (&status, buf, sizeof (status));
+ fpsaved = status;
+ }
+ else
+ {
+ if ((fpsaved = core_env387.status) != 0)
+ memcpy(&fps, &core_env387, sizeof(fps));
+ }
+
+ if (fpsaved == 0)
+ {
+ printf_unfiltered ("no floating point status saved\n");
+ return;
+ }
+
+ if (inferior_pid)
+ {
+ int offset;
+ for (offset = 0; offset < sizeof(fps); offset += 10)
+ {
+ char buf[10];
+ ptrace (PT_READ_FPR, inferior_pid, buf, offset);
+ memcpy ((char *)&fps.control + offset, buf,
+ MIN(10, sizeof(fps) - offset));
+ }
+ }
+ fps_fixed = fps;
+ for (i = 0; i < 8; ++i)
+ memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10);
+ print_387_status (0, &fps_fixed);
+}
+
+/* Fetch one register. */
+static void
+fetch_register (regno)
+ int regno;
+{
+ char buf[MAX_REGISTER_RAW_SIZE];
+ if (regno < FP0_REGNUM)
+ *(int *)buf = ptrace (PT_READ_GPR, inferior_pid,
+ PT_REG(regmap[regno]), 0, 0);
+ else
+ ptrace (PT_READ_FPR, inferior_pid, buf,
+ (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
+ supply_register (regno, buf);
+}
+
+void
+fetch_inferior_registers (regno)
+ int regno;
+{
+ if (regno < 0)
+ for (regno = 0; regno < NUM_REGS; regno++)
+ fetch_register (regno);
+ else
+ fetch_register (regno);
+}
+
+/* store one register */
+static void
+store_register (regno)
+ int regno;
+{
+ char buf[80];
+ extern char registers[];
+ errno = 0;
+ if (regno < FP0_REGNUM)
+ ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]),
+ *(int *) &registers[REGISTER_BYTE (regno)], 0);
+ else
+ ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],
+ (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
+
+ if (errno != 0)
+ {
+ sprintf (buf, "writing register number %d", regno);
+ perror_with_name (buf);
+ }
+}
+
+/* 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;
+{
+ if (regno < 0)
+ for (regno = 0; regno < NUM_REGS; regno++)
+ store_register (regno);
+ else
+ store_register (regno);
+}
+
+#ifndef CD_AX /* defined in sys/i386/coredump.h */
+# define CD_AX 0
+# define CD_BX 1
+# define CD_CX 2
+# define CD_DX 3
+# define CD_SI 4
+# define CD_DI 5
+# define CD_BP 6
+# define CD_SP 7
+# define CD_FL 8
+# define CD_IP 9
+# define CD_CS 10
+# define CD_DS 11
+# define CD_ES 12
+# define CD_FS 13
+# define CD_GS 14
+# define CD_SS 15
+#endif
+
+/*
+ * The order here in core_regmap[] has to be the same as in
+ * regmap[] above.
+ */
+static int core_regmap[] =
+{
+ CD_AX, CD_CX, CD_DX, CD_BX,
+ CD_SP, CD_BP, CD_SI, CD_DI,
+ CD_IP, CD_FL, CD_CS, CD_SS,
+ CD_DS, CD_ES, CD_FS, CD_GS,
+};
+
+static void
+fetch_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; /* ignored */
+{
+
+ if (which == 0)
+ {
+ /* Integer registers */
+
+#define cd_regs(n) ((int *)core_reg_sect)[n]
+#define regs(n) *((int *) &registers[REGISTER_BYTE (n)])
+
+ int i;
+ for (i = 0; i < FP0_REGNUM; i++)
+ regs(i) = cd_regs(core_regmap[i]);
+ }
+ else if (which == 2)
+ {
+ /* Floating point registers */
+
+ if (core_reg_size >= sizeof (core_env387))
+ memcpy (&core_env387, core_reg_sect, core_reg_size);
+ else
+ fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
+ }
+}
+
+
+/* Register that we are able to handle i386aix core file formats.
+ FIXME: is this really bfd_target_unknown_flavour? */
+
+static struct core_fns i386aix_core_fns =
+{
+ bfd_target_unknown_flavour,
+ fetch_core_registers,
+ NULL
+};
+
+void
+_initialize_core_i386aix ()
+{
+ add_core_fns (&i386aix_core_fns);
+}
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