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-rw-r--r--gdb/i386ly-nat.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/gdb/i386ly-nat.c b/gdb/i386ly-nat.c
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+/* Native-dependent code for Intel 386 running LynxOS.
+ Copyright 1988, 1989, 1991, 1992, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "target.h"
+
+#include <sys/ptrace.h>
+#include "/usr/include/sys/wait.h"
+
+/* these values indicate the offset of the named register in the econtext
+ structure */
+
+#define EAX 10
+#define ECX 9
+#define EDX 8
+#define EBX 7
+#define ESP 16
+#define EBP 5
+#define ESI 4
+#define EDI 3
+#define EIP 13
+#define EFL 15
+#define CS 14
+#define SS 17
+#define DS 2
+#define ES 1
+
+/* Currently these are not being used. So set them to 0 */
+
+#define FS 0
+#define GS 0
+
+/* this table must line up with REGISTER_NAMES in m-i386.h */
+static unsigned int regmap[] =
+{
+ EAX, ECX, EDX, EBX,
+ ESP, EBP, ESI, EDI,
+ EIP, EFL, CS, SS,
+ DS, ES, FS, GS,
+};
+
+/* Return the address in the core dump or inferior of register REGNO.
+ BLOCKEND is the address of the econtext structure */
+
+static unsigned int
+register_addr (regno, blockend)
+ int regno, blockend;
+{
+ if (regno < 0 || regno >= NUM_REGS)
+ error ("Invalid register number %d.", regno);
+
+ return (blockend + regmap[regno] * sizeof (long));
+}
+
+/* Fetch one register. */
+
+static void
+fetch_register (regno, offset, bpid)
+ int regno, bpid;
+ unsigned int offset;
+{
+ unsigned int regaddr;
+ char buf[MAX_REGISTER_RAW_SIZE];
+ char mess[128]; /* For messages */
+ int i;
+
+ regaddr = register_addr (regno, offset);
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
+ {
+ errno = 0;
+ *(int *) &buf[i] = ptrace (PTRACE_PEEKTHREAD, bpid,
+ (PTRACE_ARG3_TYPE) regaddr, 0);
+ regaddr += sizeof (int);
+ if (errno != 0)
+ {
+ sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
+ perror_with_name (mess);
+ }
+ }
+ supply_register (regno, 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). */
+
+static void
+store_register (regno, offset, bpid)
+ int regno, bpid;
+ unsigned int offset;
+{
+ unsigned int regaddr;
+ char mess[128];
+ extern char registers[];
+ int i;
+
+ regaddr = register_addr (regno, offset);
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
+ {
+ errno = 0;
+ ptrace (PTRACE_POKEUSER, bpid, (PTRACE_ARG3_TYPE) regaddr,
+ *(int *) &registers[REGISTER_BYTE (regno) + i]);
+ if (errno != 0)
+ {
+ sprintf (mess, "writing register number %d(%d)", regno, i);
+ perror_with_name (mess);
+ }
+ regaddr += sizeof(int);
+ }
+}
+
+/* return an offset for use with register_addr() */
+
+static unsigned int
+fetch_offset (pid)
+ int pid;
+{
+ struct st_entry s;
+ unsigned int specpage_off, offset = (char *) &s.ecp - (char *) &s;
+
+ errno = 0;
+ specpage_off = ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE) 0, 0);
+ if (errno != 0)
+ perror_with_name ("ptrace");
+ errno = 0;
+ offset = ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE) offset, 0)
+ - specpage_off;
+ if (errno != 0)
+ perror_with_name ("ptrace");
+ return offset;
+}
+
+/* Fetch all registers, or just one, from the child process. */
+
+void
+fetch_inferior_registers (regno)
+ int regno;
+{
+ unsigned int offset = fetch_offset (inferior_pid);
+
+ if (regno == -1)
+ {
+ for (regno = 0; regno < NUM_REGS; regno++)
+ fetch_register (regno, offset, inferior_pid);
+ }
+ else
+ fetch_register (regno, offset, inferior_pid);
+}
+
+/* Store all registers, or just one, to the child process. */
+
+void
+store_inferior_registers (regno)
+ int regno;
+{
+ unsigned int offset = fetch_offset (inferior_pid);
+
+ if (regno == -1)
+ {
+ for (regno = 0; regno < NUM_REGS; regno++)
+ store_register (regno, offset, inferior_pid);
+ }
+ else
+ store_register (regno, offset, inferior_pid);
+}
+
+/* Wait for child to do something. Return pid of child, or -1 in case
+ of error; store status through argument pointer STATUS. */
+
+int
+child_wait (pid, status)
+ int pid;
+ int *status;
+{
+ int save_errno;
+ int thread;
+
+ while (1)
+ {
+ int sig;
+
+ if (attach_flag)
+ set_sigint_trap(); /* Causes SIGINT to be passed on to the
+ attached process. */
+ pid = wait (status);
+ save_errno = errno;
+
+ if (attach_flag)
+ clear_sigint_trap();
+
+ if (pid == -1)
+ {
+ if (save_errno == EINTR)
+ continue;
+ fprintf (stderr, "Child process unexpectedly missing: %s.\n",
+ safe_strerror (save_errno));
+ *status = 42; /* Claim it exited with signal 42 */
+ return -1;
+ }
+
+ if (pid != PIDGET (inferior_pid)) /* Some other process?!? */
+ continue;
+
+/* thread = WIFTID (*status);*/
+ thread = *status >> 16;
+
+ /* Initial thread value can only be acquired via wait, so we have to
+ resort to this hack. */
+
+ if (TIDGET (inferior_pid) == 0)
+ {
+ inferior_pid = BUILDPID (inferior_pid, thread);
+ add_thread (inferior_pid);
+ }
+
+ pid = BUILDPID (pid, thread);
+
+ return pid;
+ }
+}
+
+/* Convert a Lynx process ID to a string. Returns the string in a static
+ buffer. */
+
+char *
+i386lynx_pid_to_str (pid)
+ int pid;
+{
+ static char buf[40];
+
+ sprintf (buf, "process %d thread %d", PIDGET (pid), TIDGET (pid));
+
+ return buf;
+}
+
+/* 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.
+ */
+
+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 st_entry s;
+ unsigned int regno, addr;
+
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ addr = register_addr (regno, (char *) &s.ec - (char *) &s);
+ supply_register (regno, core_reg_sect + addr);
+ }
+}
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