-/* Native dependent code for dos running GO32 for GDB, the GNU debugger.
- Copyright 1992 Free Software Foundation, Inc.
+/* Native debugging support for Intel x86 running DJGPP.
+ Copyright 1997, 1999 Free Software Foundation, Inc.
+ Written by Robert Hoehne.
-This file is part of GDB.
+ 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 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.
+ 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. */
+ 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 <stdio.h>
+#include <fcntl.h>
-static void uerror(char *s)
+#include "defs.h"
+#include "frame.h" /* required by inferior.h */
+#include "inferior.h"
+#include "target.h"
+#include "gdb_wait.h"
+#include "gdbcore.h"
+#include "command.h"
+#include "floatformat.h"
+
+#include <stdio.h> /* required for __DJGPP_MINOR__ */
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <io.h>
+#include <dpmi.h>
+#include <debug/v2load.h>
+#include <debug/dbgcom.h>
+#if __DJGPP_MINOR__ > 2
+#include <debug/redir.h>
+#endif
+
+#if __DJGPP_MINOR__ < 3
+/* This code will be provided from DJGPP 2.03 on. Until then I code it
+ here */
+typedef struct
+ {
+ unsigned short sig0;
+ unsigned short sig1;
+ unsigned short sig2;
+ unsigned short sig3;
+ unsigned short exponent:15;
+ unsigned short sign:1;
+ }
+NPXREG;
+
+typedef struct
+ {
+ unsigned int control;
+ unsigned int status;
+ unsigned int tag;
+ unsigned int eip;
+ unsigned int cs;
+ unsigned int dataptr;
+ unsigned int datasel;
+ NPXREG reg[8];
+ }
+NPX;
+
+static NPX npx;
+
+static void save_npx (void); /* Save the FPU of the debugged program */
+static void load_npx (void); /* Restore the FPU of the debugged program */
+
+/* ------------------------------------------------------------------------- */
+/* Store the contents of the NPX in the global variable `npx'. */
+/* *INDENT-OFF* */
+
+static void
+save_npx (void)
+{
+ asm ("inb $0xa0, %%al
+ testb $0x20, %%al
+ jz 1f
+ xorb %% al, %%al
+ outb %% al, $0xf0
+ movb $0x20, %%al
+ outb %% al, $0xa0
+ outb %% al, $0x20
+1:
+ fnsave % 0
+ fwait "
+: "=m" (npx)
+: /* No input */
+: "%eax");
+}
+
+/* *INDENT-ON* */
+
+
+
+
+
+/* ------------------------------------------------------------------------- */
+/* Reload the contents of the NPX from the global variable `npx'. */
+
+static void
+load_npx (void)
+{
+asm ("frstor %0":"=m" (npx));
+}
+/* ------------------------------------------------------------------------- */
+/* Stubs for the missing redirection functions. */
+typedef struct {
+ char *command;
+ int redirected;
+} cmdline_t;
+
+void redir_cmdline_delete (cmdline_t *ptr) {ptr->redirected = 0;}
+int redir_cmdline_parse (const char *args, cmdline_t *ptr)
+{
+ return -1;
+}
+int redir_to_child (cmdline_t *ptr)
+{
+ return 1;
+}
+int redir_to_debugger (cmdline_t *ptr)
+{
+ return 1;
+}
+int redir_debug_init (cmdline_t *ptr) { return 0; }
+#endif /* __DJGPP_MINOR < 3 */
+
+extern void _initialize_go32_nat (void);
+
+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];
+ };
+
+typedef enum { wp_insert, wp_remove, wp_count } wp_op;
+
+/* This holds the current reference counts for each debug register. */
+static int dr_ref_count[4];
+
+extern char **environ;
+
+#define SOME_PID 42
+
+static int prog_has_started = 0;
+static void print_387_status (unsigned short status, struct env387 *ep);
+static void go32_open (char *name, int from_tty);
+static void go32_close (int quitting);
+static void go32_attach (char *args, int from_tty);
+static void go32_detach (char *args, int from_tty);
+static void go32_resume (int pid, int step, enum target_signal siggnal);
+static int go32_wait (int pid, struct target_waitstatus *status);
+static void go32_fetch_registers (int regno);
+static void store_register (int regno);
+static void go32_store_registers (int regno);
+static void go32_prepare_to_store (void);
+static int go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
+ int write, struct target_ops *target);
+static void go32_files_info (struct target_ops *target);
+static void go32_stop (void);
+static void go32_kill_inferior (void);
+static void go32_create_inferior (char *exec_file, char *args, char **env);
+static void cleanup_dregs (void);
+static void go32_mourn_inferior (void);
+static int go32_can_run (void);
+static void ignore (void);
+static void ignore2 (char *a, int b);
+static int go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr,
+ int len, int rw);
+static int go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr,
+ int len, int rw);
+static int go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr,
+ CORE_ADDR addr, int len, int rw);
+
+static struct target_ops go32_ops;
+static void go32_terminal_init (void);
+static void go32_terminal_inferior (void);
+static void go32_terminal_ours (void);
+
+static void
+print_387_status (unsigned short status, struct env387 *ep)
{
- fprintf(stderr, "Fatal: %s!\n");
- exit(1);
+ int i;
+ int bothstatus;
+ int top;
+ int fpreg;
+
+ 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 & 0xffff);
+ /* Other platforms say "last exception", but that's not true: the
+ FPU stores the last non-control instruction there. */
+ printf_unfiltered ("last FP instruction: ");
+ /* The ORing with D800h restores the upper 5 bits of the opcode that
+ are not stored by the FPU (since these bits are the same for all
+ floating-point instructions). */
+ printf_unfiltered ("opcode %s; ",
+ local_hex_string (ep->opcode ? (ep->opcode|0xd800) : 0));
+ 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--)
+ {
+ /* FNSAVE saves the FP registers in their logical TOP-relative
+ order, beginning with ST(0). Since we need to print them in
+ their physical order, we have to remap them. */
+ int regno = fpreg - top;
+ long double val;
+
+ if (regno < 0)
+ regno += 8;
+
+ printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
+
+ switch ((ep->tag >> (fpreg * 2)) & 3)
+ {
+ case 0:
+ printf_unfiltered ("valid ");
+ break;
+ case 1:
+ printf_unfiltered ("zero ");
+ break;
+ case 2:
+ /* All other versions of print_387_status use TRAP here, but I
+ think this is misleading, since Intel manuals say SPECIAL. */
+ printf_unfiltered ("special ");
+ break;
+ case 3:
+ printf_unfiltered ("empty ");
+ break;
+ }
+ for (i = 9; i >= 0; i--)
+ printf_unfiltered ("%02x", ep->regs[regno][i]);
+
+ REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM+regno, builtin_type_long_double,
+ &ep->regs[regno], &val);
+
+ printf_unfiltered (" %.19LG\n", val);
+ }
}
-fetch_core_registers(){uerror("attempt to call fetch_core_registers()");}
+void
+i386_go32_float_info (void)
+{
+ print_387_status (0, (struct env387 *) &npx);
+}
-fetch_inferior_registers(){uerror("attempt to call fetch_inferior_registers()");}
-store_inferior_registers(){uerror("attempt to call store_inferior_registers()");}
+#define r_ofs(x) (offsetof(TSS,x))
-child_resume(){uerror("attempt to call child_resume()");}
-child_xfer_memory(){uerror("attempt to call child_xfer_memory()");}
+static struct
+{
+ size_t tss_ofs;
+ size_t size;
+}
+regno_mapping[] =
+{
+ r_ofs (tss_eax), 4, /* normal registers, from a_tss */
+ r_ofs (tss_ecx), 4,
+ r_ofs (tss_edx), 4,
+ r_ofs (tss_ebx), 4,
+ r_ofs (tss_esp), 4,
+ r_ofs (tss_ebp), 4,
+ r_ofs (tss_esi), 4,
+ r_ofs (tss_edi), 4,
+ r_ofs (tss_eip), 4,
+ r_ofs (tss_eflags), 4,
+ r_ofs (tss_cs), 2,
+ r_ofs (tss_ss), 2,
+ r_ofs (tss_ds), 2,
+ r_ofs (tss_es), 2,
+ r_ofs (tss_fs), 2,
+ r_ofs (tss_gs), 2,
+ 0, 10, /* 8 FP registers, from npx.reg[] */
+ 1, 10,
+ 2, 10,
+ 3, 10,
+ 4, 10,
+ 5, 10,
+ 6, 10,
+ 7, 10,
+ /* The order of the next 7 registers must be consistent
+ with their numbering in config/i386/tm-go32.h, which see. */
+ 0, 2, /* control word, from npx */
+ 4, 2, /* status word, from npx */
+ 8, 2, /* tag word, from npx */
+ 16, 2, /* last FP exception CS from npx */
+ 24, 2, /* last FP exception operand selector from npx */
+ 12, 4, /* last FP exception EIP from npx */
+ 20, 4 /* last FP exception operand offset from npx */
+};
+
+static struct
+ {
+ int go32_sig;
+ int gdb_sig;
+ }
+sig_map[] =
+{
+ 0, TARGET_SIGNAL_FPE,
+ 1, TARGET_SIGNAL_TRAP,
+ /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL,
+ but I think SIGBUS is better, since the NMI is usually activated
+ as a result of a memory parity check failure. */
+ 2, TARGET_SIGNAL_BUS,
+ 3, TARGET_SIGNAL_TRAP,
+ 4, TARGET_SIGNAL_FPE,
+ 5, TARGET_SIGNAL_SEGV,
+ 6, TARGET_SIGNAL_ILL,
+ 7, TARGET_SIGNAL_EMT, /* no-coprocessor exception */
+ 8, TARGET_SIGNAL_SEGV,
+ 9, TARGET_SIGNAL_SEGV,
+ 10, TARGET_SIGNAL_BUS,
+ 11, TARGET_SIGNAL_SEGV,
+ 12, TARGET_SIGNAL_SEGV,
+ 13, TARGET_SIGNAL_SEGV,
+ 14, TARGET_SIGNAL_SEGV,
+ 16, TARGET_SIGNAL_FPE,
+ 17, TARGET_SIGNAL_BUS,
+ 31, TARGET_SIGNAL_ILL,
+ 0x1b, TARGET_SIGNAL_INT,
+ 0x75, TARGET_SIGNAL_FPE,
+ 0x78, TARGET_SIGNAL_ALRM,
+ 0x79, TARGET_SIGNAL_INT,
+ 0x7a, TARGET_SIGNAL_QUIT,
+ -1, -1
+};
+
+static struct {
+ enum target_signal gdb_sig;
+ int djgpp_excepno;
+} excepn_map[] = {
+ TARGET_SIGNAL_0, -1,
+ TARGET_SIGNAL_ILL, 6, /* Invalid Opcode */
+ TARGET_SIGNAL_EMT, 7, /* triggers SIGNOFP */
+ TARGET_SIGNAL_SEGV, 13, /* GPF */
+ TARGET_SIGNAL_BUS, 17, /* Alignment Check */
+ /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for
+ details. */
+ TARGET_SIGNAL_TERM, 0x1b, /* triggers Ctrl-Break type of SIGINT */
+ TARGET_SIGNAL_FPE, 0x75,
+ TARGET_SIGNAL_INT, 0x79,
+ TARGET_SIGNAL_QUIT, 0x7a,
+ TARGET_SIGNAL_ALRM, 0x78, /* triggers SIGTIMR */
+ TARGET_SIGNAL_PROF, 0x78,
+ -1, -1
+};
+
+static void
+go32_open (char *name, int from_tty)
+{
+ printf_unfiltered ("Done. Use the \"run\" command to run the program.\n");
+}
+static void
+go32_close (int quitting)
+{
+}
+
+static void
+go32_attach (char *args, int from_tty)
+{
+ error ("\
+You cannot attach to a running program on this platform.\n\
+Use the `run' command to run DJGPP programs.");
+}
+
+static void
+go32_detach (char *args, int from_tty)
+{
+}
+
+static int resume_is_step;
+static int resume_signal = -1;
+
+static void
+go32_resume (int pid, int step, enum target_signal siggnal)
+{
+ int i;
+
+ resume_is_step = step;
+
+ if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP)
+ {
+ for (i = 0, resume_signal = -1; excepn_map[i].gdb_sig != -1; i++)
+ if (excepn_map[i].gdb_sig == siggnal)
+ {
+ resume_signal = excepn_map[i].djgpp_excepno;
+ break;
+ }
+ if (resume_signal == -1)
+ printf_unfiltered ("Cannot deliver signal %s on this platform.\n",
+ target_signal_to_name (siggnal));
+ }
+}
+
+static char child_cwd[FILENAME_MAX];
+
+static int
+go32_wait (int pid, struct target_waitstatus *status)
+{
+ int i;
+ unsigned char saved_opcode;
+ unsigned long INT3_addr;
+ int stepping_over_INT = 0;
+
+ a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */
+ if (resume_is_step)
+ {
+ /* If the next instruction is INT xx or INTO, we need to handle
+ them specially. Intel manuals say that these instructions
+ reset the single-step flag (a.k.a. TF). However, it seems
+ that, at least in the DPMI environment, and at least when
+ stepping over the DPMI interrupt 31h, the problem is having
+ TF set at all when INT 31h is executed: the debuggee either
+ crashes (and takes the system with it) or is killed by a
+ SIGTRAP.
+
+ So we need to emulate single-step mode: we put an INT3 opcode
+ right after the INT xx instruction, let the debuggee run
+ until it hits INT3 and stops, then restore the original
+ instruction which we overwrote with the INT3 opcode, and back
+ up the debuggee's EIP to that instruction. */
+ read_child (a_tss.tss_eip, &saved_opcode, 1);
+ if (saved_opcode == 0xCD || saved_opcode == 0xCE)
+ {
+ unsigned char INT3_opcode = 0xCC;
+
+ INT3_addr
+ = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1;
+ stepping_over_INT = 1;
+ read_child (INT3_addr, &saved_opcode, 1);
+ write_child (INT3_addr, &INT3_opcode, 1);
+ }
+ else
+ a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */
+ }
+
+ /* The special value FFFFh in tss_trap indicates to run_child that
+ tss_irqn holds a signal to be delivered to the debuggee. */
+ if (resume_signal <= -1)
+ {
+ a_tss.tss_trap = 0;
+ a_tss.tss_irqn = 0xff;
+ }
+ else
+ {
+ a_tss.tss_trap = 0xffff; /* run_child looks for this */
+ a_tss.tss_irqn = resume_signal;
+ }
+
+ /* The child might change working directory behind our back. The
+ GDB users won't like the side effects of that when they work with
+ relative file names, and GDB might be confused by its current
+ directory not being in sync with the truth. So we always make a
+ point of changing back to where GDB thinks is its cwd, when we
+ return control to the debugger, but restore child's cwd before we
+ run it. */
+ chdir (child_cwd);
+
+#if __DJGPP_MINOR__ < 3
+ load_npx ();
+#endif
+ run_child ();
+#if __DJGPP_MINOR__ < 3
+ save_npx ();
+#endif
+
+ /* Did we step over an INT xx instruction? */
+ if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1)
+ {
+ /* Restore the original opcode. */
+ a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */
+ write_child (a_tss.tss_eip, &saved_opcode, 1);
+ /* Simulate a TRAP exception. */
+ a_tss.tss_irqn = 1;
+ a_tss.tss_eflags |= 0x0100;
+ }
+
+ getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */
+ chdir (current_directory);
+
+ if (a_tss.tss_irqn == 0x21)
+ {
+ status->kind = TARGET_WAITKIND_EXITED;
+ status->value.integer = a_tss.tss_eax & 0xff;
+ }
+ else
+ {
+ status->value.sig = TARGET_SIGNAL_UNKNOWN;
+ status->kind = TARGET_WAITKIND_STOPPED;
+ for (i = 0; sig_map[i].go32_sig != -1; i++)
+ {
+ if (a_tss.tss_irqn == sig_map[i].go32_sig)
+ {
+#if __DJGPP_MINOR__ < 3
+ if ((status->value.sig = sig_map[i].gdb_sig) !=
+ TARGET_SIGNAL_TRAP)
+ status->kind = TARGET_WAITKIND_SIGNALLED;
+#else
+ status->value.sig = sig_map[i].gdb_sig;
+#endif
+ break;
+ }
+ }
+ }
+ return SOME_PID;
+}
+
+static void
+go32_fetch_registers (int regno)
+{
+ /*JHW */
+ int end_reg = regno + 1; /* just one reg initially */
+
+ if (regno < 0) /* do the all registers */
+ {
+ regno = 0; /* start at first register */
+ /* # regs in table */
+ end_reg = sizeof (regno_mapping) / sizeof (regno_mapping[0]);
+ }
+
+ for (; regno < end_reg; regno++)
+ {
+ if (regno < 16)
+ supply_register (regno,
+ (char *) &a_tss + regno_mapping[regno].tss_ofs);
+ else if (regno < 24)
+ supply_register (regno,
+ (char *) &npx.reg[regno_mapping[regno].tss_ofs]);
+ else if (regno < 31)
+ supply_register (regno,
+ (char *) &npx + regno_mapping[regno].tss_ofs);
+ else
+ internal_error ("Invalid register no. %d in go32_fetch_register.",
+ regno);
+ }
+}
+
+static void
+store_register (int regno)
+{
+ void *rp;
+ void *v = (void *) ®isters[REGISTER_BYTE (regno)];
+
+ if (regno < 16)
+ rp = (char *) &a_tss + regno_mapping[regno].tss_ofs;
+ else if (regno < 24)
+ rp = (char *) &npx.reg[regno_mapping[regno].tss_ofs];
+ else if (regno < 31)
+ rp = (char *) &npx + regno_mapping[regno].tss_ofs;
+ else
+ internal_error ("Invalid register no. %d in store_register.", regno);
+ memcpy (rp, v, regno_mapping[regno].size);
+}
+
+static void
+go32_store_registers (int regno)
+{
+ int r;
+
+ if (regno >= 0)
+ store_register (regno);
+ else
+ {
+ for (r = 0; r < sizeof (regno_mapping) / sizeof (regno_mapping[0]); r++)
+ store_register (r);
+ }
+}
+
+static void
+go32_prepare_to_store (void)
+{
+}
+
+static int
+go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
+ struct target_ops *target)
+{
+ if (write)
+ {
+ if (write_child (memaddr, myaddr, len))
+ {
+ return 0;
+ }
+ else
+ {
+ return len;
+ }
+ }
+ else
+ {
+ if (read_child (memaddr, myaddr, len))
+ {
+ return 0;
+ }
+ else
+ {
+ return len;
+ }
+ }
+}
+
+static cmdline_t child_cmd; /* parsed child's command line kept here */
+
+static void
+go32_files_info (struct target_ops *target)
+{
+ printf_unfiltered ("You are running a DJGPP V2 program.\n");
+}
+
+static void
+go32_stop (void)
+{
+ normal_stop ();
+ cleanup_client ();
+ inferior_pid = 0;
+ prog_has_started = 0;
+}
+
+static void
+go32_kill_inferior (void)
+{
+ redir_cmdline_delete (&child_cmd);
+ resume_signal = -1;
+ resume_is_step = 0;
+ unpush_target (&go32_ops);
+}
+
+static void
+go32_create_inferior (char *exec_file, char *args, char **env)
+{
+ jmp_buf start_state;
+ char *cmdline;
+ char **env_save = environ;
+
+ if (prog_has_started)
+ {
+ go32_stop ();
+ go32_kill_inferior ();
+ }
+ resume_signal = -1;
+ resume_is_step = 0;
+ /* Init command line storage. */
+ if (redir_debug_init (&child_cmd) == -1)
+ internal_error ("Cannot allocate redirection storage: not enough memory.\n");
+
+ /* Parse the command line and create redirections. */
+ if (strpbrk (args, "<>"))
+ {
+ if (redir_cmdline_parse (args, &child_cmd) == 0)
+ args = child_cmd.command;
+ else
+ error ("Syntax error in command line.");
+ }
+ else
+ child_cmd.command = xstrdup (args);
+
+ cmdline = (char *) alloca (strlen (args) + 4);
+ cmdline[0] = strlen (args);
+ strcpy (cmdline + 1, args);
+ cmdline[strlen (args) + 1] = 13;
+
+ environ = env;
+
+ if (v2loadimage (exec_file, cmdline, start_state))
+ {
+ environ = env_save;
+ printf_unfiltered ("Load failed for image %s\n", exec_file);
+ exit (1);
+ }
+ environ = env_save;
+
+ edi_init (start_state);
+#if __DJGPP_MINOR__ < 3
+ save_npx ();
+#endif
+
+ inferior_pid = SOME_PID;
+ push_target (&go32_ops);
+ clear_proceed_status ();
+ insert_breakpoints ();
+ proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
+ prog_has_started = 1;
+}
+
+static void
+go32_mourn_inferior (void)
+{
+ /* We need to make sure all the breakpoint enable bits in the DR7
+ register are reset when the inferior exits. Otherwise, if they
+ rerun the inferior, the uncleared bits may cause random SIGTRAPs,
+ failure to set more watchpoints, and other calamities. It would
+ be nice if GDB itself would take care to remove all breakpoints
+ at all times, but it doesn't, probably under an assumption that
+ the OS cleans up when the debuggee exits. */
+ cleanup_dregs ();
+ go32_kill_inferior ();
+ generic_mourn_inferior ();
+}
+
+static int
+go32_can_run (void)
+{
+ return 1;
+}
+
+static void
+ignore (void)
+{
+}
+
+/* Hardware watchpoint support. */
+
+#define DR_STATUS 6
+#define DR_CONTROL 7
+#define DR_ENABLE_SIZE 2
+#define DR_LOCAL_ENABLE_SHIFT 0
+#define DR_GLOBAL_ENABLE_SHIFT 1
+#define DR_LOCAL_SLOWDOWN 0x100
+#define DR_GLOBAL_SLOWDOWN 0x200
+#define DR_CONTROL_SHIFT 16
+#define DR_CONTROL_SIZE 4
+#define DR_RW_READWRITE 0x3
+#define DR_RW_WRITE 0x1
+#define DR_CONTROL_MASK 0xf
+#define DR_ENABLE_MASK 0x3
+#define DR_LEN_1 0x0
+#define DR_LEN_2 0x4
+#define DR_LEN_4 0xc
+
+#define D_REGS edi.dr
+#define CONTROL D_REGS[DR_CONTROL]
+#define STATUS D_REGS[DR_STATUS]
+
+#define IS_REG_FREE(index) \
+ (!(CONTROL & (3 << (DR_ENABLE_SIZE * (index)))))
+
+#define LOCAL_ENABLE_REG(index) \
+ (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index))))
+
+#define GLOBAL_ENABLE_REG(index) \
+ (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index))))
+
+#define DISABLE_REG(index) \
+ (CONTROL &= ~(3 << (DR_ENABLE_SIZE * (index))))
+
+#define SET_LOCAL_EXACT() \
+ (CONTROL |= DR_LOCAL_SLOWDOWN)
+
+#define SET_GLOBAL_EXACT() \
+ (CONTROL |= DR_GLOBAL_SLOWDOWN)
+
+#define RESET_LOCAL_EXACT() \
+ (CONTROL &= ~(DR_LOCAL_SLOWDOWN))
+
+#define RESET_GLOBAL_EXACT() \
+ (CONTROL &= ~(DR_GLOBAL_SLOWDOWN))
+
+#define SET_BREAK(index,address) \
+ do {\
+ CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index)));\
+ D_REGS[index] = address;\
+ dr_ref_count[index]++;\
+ } while(0)
+
+#define SET_WATCH(index,address,rw,len) \
+ do {\
+ SET_BREAK(index,address);\
+ CONTROL |= ((len)|(rw)) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index));\
+ } while (0)
+
+#define IS_WATCH(index) \
+ (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE*(index))))
+
+#define WATCH_HIT(index) ((STATUS & (1 << (index))) && IS_WATCH(index))
+
+#define DR_DEF(index) \
+ ((CONTROL >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index))) & 0x0f)
+
+
+#if 0 /* use debugging macro */
+#define SHOW_DR(text,len) \
+do { \
+ if (!getenv ("GDB_SHOW_DR")) break; \
+ fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \
+ fprintf(stderr,"%08x %d %08x %d ", \
+ edi.dr[0],dr_ref_count[0],edi.dr[1],dr_ref_count[1]); \
+ fprintf(stderr,"%08x %d %08x %d ", \
+ edi.dr[2],dr_ref_count[2],edi.dr[3],dr_ref_count[3]); \
+ fprintf(stderr,(len)?"(%s:%d)\n":"(%s)\n",#text,len); \
+} while (0)
+#else
+#define SHOW_DR(text,len) do {} while (0)
+#endif
+
+static void
+cleanup_dregs (void)
+{
+ int i;
+
+ CONTROL = 0;
+ STATUS = 0;
+ for (i = 0; i < 4; i++)
+ {
+ D_REGS[i] = 0;
+ dr_ref_count[i] = 0;
+ }
+}
+
+/* Insert a watchpoint. */
+
+int
+go32_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
+{
+ int ret = go32_insert_aligned_watchpoint (addr, addr, len, rw);
+
+ SHOW_DR (insert_watch, len);
+ return ret;
+}
+
+static int
+go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr,
+ int len, int rw)
+{
+ int i;
+ int read_write_bits, len_bits;
+
+ /* Values of rw: 0 - write, 1 - read, 2 - access (read and write).
+ However, x86 doesn't support read-only data breakpoints. */
+ read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE;
+
+ switch (len)
+ {
+ case 4:
+ len_bits = DR_LEN_4;
+ break;
+ case 2:
+ len_bits = DR_LEN_2;
+ break;
+ case 1:
+ len_bits = DR_LEN_1;
+ break;
+ default:
+ /* The debug registers only have 2 bits for the length, so
+ so this value will always fail the loop below. */
+ len_bits = 0x10;
+ }
+
+ /* Look for an occupied debug register with the same address and the
+ same RW and LEN definitions. If we find one, we can use it for
+ this watchpoint as well (and save a register). */
+ for (i = 0; i < 4; i++)
+ {
+ if (!IS_REG_FREE (i) && D_REGS[i] == addr
+ && DR_DEF (i) == (len_bits | read_write_bits))
+ {
+ dr_ref_count[i]++;
+ return 0;
+ }
+ }
+
+ /* Look for a free debug register. */
+ for (i = 0; i <= 3; i++)
+ {
+ if (IS_REG_FREE (i))
+ break;
+ }
+
+ /* No more debug registers! */
+ if (i > 3)
+ return -1;
+
+ if (len == 2)
+ {
+ if (addr % 2)
+ return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr,
+ len, rw);
+ }
+ else if (len == 4)
+ {
+ if (addr % 4)
+ return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr,
+ len, rw);
+ }
+ else if (len != 1)
+ return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, len, rw);
+
+ SET_WATCH (i, addr, read_write_bits, len_bits);
+ LOCAL_ENABLE_REG (i);
+ SET_LOCAL_EXACT ();
+ SET_GLOBAL_EXACT ();
+ return 0;
+}
+
+static int
+go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, CORE_ADDR addr,
+ int len, int rw)
+{
+ int align;
+ int size;
+ int rv = 0, status = 0;
+
+ static int size_try_array[16] =
+ {
+ 1, 1, 1, 1, /* trying size one */
+ 2, 1, 2, 1, /* trying size two */
+ 2, 1, 2, 1, /* trying size three */
+ 4, 1, 2, 1 /* trying size four */
+ };
+
+ while (len > 0)
+ {
+ align = addr % 4;
+ /* Four is the maximum length for 386. */
+ size = (len > 4) ? 3 : len - 1;
+ size = size_try_array[size * 4 + align];
+ if (what == wp_insert)
+ status = go32_insert_aligned_watchpoint (waddr, addr, size, rw);
+ else if (what == wp_remove)
+ status = go32_remove_aligned_watchpoint (waddr, addr, size, rw);
+ else if (what == wp_count)
+ rv++;
+ else
+ status = -1;
+ /* We keep the loop going even after a failure, because some of
+ the other aligned watchpoints might still succeed, e.g. if
+ they watch addresses that are already watched, and thus just
+ increment the reference counts of occupied debug registers.
+ If we break out of the loop too early, we could cause those
+ addresses watched by other watchpoints to be disabled when
+ GDB reacts to our failure to insert this watchpoint and tries
+ to remove it. */
+ if (status)
+ rv = status;
+ addr += size;
+ len -= size;
+ }
+ return rv;
+}
+
+/* Remove a watchpoint. */
+
+int
+go32_remove_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
+{
+ int ret = go32_remove_aligned_watchpoint (addr, addr, len, rw);
+
+ SHOW_DR (remove_watch, len);
+ return ret;
+}
+
+static int
+go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr,
+ int len, int rw)
+{
+ int i;
+ int read_write_bits, len_bits;
+
+ /* Values of rw: 0 - write, 1 - read, 2 - access (read and write).
+ However, x86 doesn't support read-only data breakpoints. */
+ read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE;
+
+ switch (len)
+ {
+ case 4:
+ len_bits = DR_LEN_4;
+ break;
+ case 2:
+ len_bits = DR_LEN_2;
+ break;
+ case 1:
+ len_bits = DR_LEN_1;
+ break;
+ default:
+ /* The debug registers only have 2 bits for the length, so
+ so this value will always fail the loop below. */
+ len_bits = 0x10;
+ }
+
+ if (len == 2)
+ {
+ if (addr % 2)
+ return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr,
+ len, rw);
+ }
+ else if (len == 4)
+ {
+ if (addr % 4)
+ return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr,
+ len, rw);
+ }
+ else if (len != 1)
+ return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, len, rw);
+
+ for (i = 0; i <= 3; i++)
+ {
+ if (!IS_REG_FREE (i) && D_REGS[i] == addr
+ && DR_DEF (i) == (len_bits | read_write_bits))
+ {
+ dr_ref_count[i]--;
+ if (dr_ref_count[i] == 0)
+ DISABLE_REG (i);
+ }
+ }
+ RESET_LOCAL_EXACT ();
+ RESET_GLOBAL_EXACT ();
+
+ return 0;
+}
+
+/* Can we use debug registers to watch a region whose address is ADDR
+ and whose length is LEN bytes? */
+
+int
+go32_region_ok_for_watchpoint (CORE_ADDR addr, int len)
+{
+ /* Compute how many aligned watchpoints we would need to cover this
+ region. */
+ int nregs = go32_handle_nonaligned_watchpoint (wp_count, addr, addr, len, 0);
+
+ return nregs <= 4 ? 1 : 0;
+}
+
+/* Check if stopped by a data watchpoint. If so, return the address
+ whose access triggered the watchpoint. */
+
+CORE_ADDR
+go32_stopped_by_watchpoint (int pid, int data_watchpoint)
+{
+ int i, ret = 0;
+ int status;
+
+ status = edi.dr[DR_STATUS];
+ SHOW_DR (stopped_by, 0);
+ for (i = 0; i <= 3; i++)
+ {
+ if (WATCH_HIT (i) && data_watchpoint)
+ {
+ SHOW_DR (WP_HIT, 0);
+ ret = D_REGS[i];
+ }
+ }
+
+ return ret;
+}
+
+/* Remove a breakpoint. */
+
+int
+go32_remove_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow)
+{
+ int i;
+ for (i = 0; i <= 3; i++)
+ {
+ if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0)
+ {
+ dr_ref_count[i]--;
+ if (dr_ref_count[i] == 0)
+ DISABLE_REG (i);
+ }
+ }
+ SHOW_DR (remove_hw, 0);
+ return 0;
+}
+
+int
+go32_insert_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow)
+{
+ int i;
+ int read_write_bits, len_bits;
+ int free_debug_register;
+ int register_number;
+
+ /* Look for an occupied debug register with the same address and the
+ same RW and LEN definitions. If we find one, we can use it for
+ this breakpoint as well (and save a register). */
+ for (i = 0; i < 4; i++)
+ {
+ if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0)
+ {
+ dr_ref_count[i]++;
+ SHOW_DR (insert_hw, 0);
+ return 0;
+ }
+ }
+
+ /* Look for a free debug register. */
+ for (i = 0; i <= 3; i++)
+ {
+ if (IS_REG_FREE (i))
+ break;
+ }
+
+ /* No more debug registers? */
+ if (i < 4)
+ {
+ SET_BREAK (i, addr);
+ LOCAL_ENABLE_REG (i);
+ }
+ SHOW_DR (insert_hw, 0);
+
+ return i < 4 ? 0 : -1;
+}
+
+/* Put the device open on handle FD into either raw or cooked
+ mode, return 1 if it was in raw mode, zero otherwise. */
+
+static int
+device_mode (int fd, int raw_p)
+{
+ int oldmode, newmode;
+ __dpmi_regs regs;
+
+ regs.x.ax = 0x4400;
+ regs.x.bx = fd;
+ __dpmi_int (0x21, ®s);
+ if (regs.x.flags & 1)
+ return -1;
+ newmode = oldmode = regs.x.dx;
+
+ if (raw_p)
+ newmode |= 0x20;
+ else
+ newmode &= ~0x20;
+
+ if (oldmode & 0x80) /* Only for character dev */
+ {
+ regs.x.ax = 0x4401;
+ regs.x.bx = fd;
+ regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */
+ __dpmi_int (0x21, ®s);
+ if (regs.x.flags & 1)
+ return -1;
+ }
+ return (oldmode & 0x20) == 0x20;
+}
+
+
+static int inf_mode_valid = 0;
+static int inf_terminal_mode;
+
+/* This semaphore is needed because, amazingly enough, GDB calls
+ target.to_terminal_ours more than once after the inferior stops.
+ But we need the information from the first call only, since the
+ second call will always see GDB's own cooked terminal. */
+static int terminal_is_ours = 1;
+
+static void
+go32_terminal_init (void)
+{
+ inf_mode_valid = 0; /* reinitialize, in case they are restarting child */
+ terminal_is_ours = 1;
+}
+
+static void
+go32_terminal_info (char *args, int from_tty)
+{
+ printf_unfiltered ("Inferior's terminal is in %s mode.\n",
+ !inf_mode_valid
+ ? "default" : inf_terminal_mode ? "raw" : "cooked");
+
+#if __DJGPP_MINOR__ > 2
+ if (child_cmd.redirection)
+ {
+ int i;
+
+ for (i = 0; i < DBG_HANDLES; i++)
+ {
+ if (child_cmd.redirection[i]->file_name)
+ printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n",
+ i, child_cmd.redirection[i]->file_name);
+ else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1)
+ printf_unfiltered
+ ("\tFile handle %d appears to be closed by inferior.\n", i);
+ /* Mask off the raw/cooked bit when comparing device info words. */
+ else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf)
+ != (_get_dev_info (i) & 0xdf))
+ printf_unfiltered
+ ("\tFile handle %d appears to be redirected by inferior.\n", i);
+ }
+ }
+#endif
+}
+
+static void
+go32_terminal_inferior (void)
+{
+ /* Redirect standard handles as child wants them. */
+ errno = 0;
+ if (redir_to_child (&child_cmd) == -1)
+ {
+ redir_to_debugger (&child_cmd);
+ error ("Cannot redirect standard handles for program: %s.",
+ strerror (errno));
+ }
+ /* set the console device of the inferior to whatever mode
+ (raw or cooked) we found it last time */
+ if (terminal_is_ours)
+ {
+ if (inf_mode_valid)
+ device_mode (0, inf_terminal_mode);
+ terminal_is_ours = 0;
+ }
+}
+
+static void
+go32_terminal_ours (void)
+{
+ /* Switch to cooked mode on the gdb terminal and save the inferior
+ terminal mode to be restored when it is resumed */
+ if (!terminal_is_ours)
+ {
+ inf_terminal_mode = device_mode (0, 0);
+ if (inf_terminal_mode != -1)
+ inf_mode_valid = 1;
+ else
+ /* If device_mode returned -1, we don't know what happens with
+ handle 0 anymore, so make the info invalid. */
+ inf_mode_valid = 0;
+ terminal_is_ours = 1;
+
+ /* Restore debugger's standard handles. */
+ errno = 0;
+ if (redir_to_debugger (&child_cmd) == -1)
+ {
+ redir_to_child (&child_cmd);
+ error ("Cannot redirect standard handles for debugger: %s.",
+ strerror (errno));
+ }
+ }
+}
+
+static void
+init_go32_ops (void)
+{
+ go32_ops.to_shortname = "djgpp";
+ go32_ops.to_longname = "djgpp target process";
+ go32_ops.to_doc =
+ "Program loaded by djgpp, when gdb is used as an external debugger";
+ go32_ops.to_open = go32_open;
+ go32_ops.to_close = go32_close;
+ go32_ops.to_attach = go32_attach;
+ go32_ops.to_detach = go32_detach;
+ go32_ops.to_resume = go32_resume;
+ go32_ops.to_wait = go32_wait;
+ go32_ops.to_fetch_registers = go32_fetch_registers;
+ go32_ops.to_store_registers = go32_store_registers;
+ go32_ops.to_prepare_to_store = go32_prepare_to_store;
+ go32_ops.to_xfer_memory = go32_xfer_memory;
+ go32_ops.to_files_info = go32_files_info;
+ go32_ops.to_insert_breakpoint = memory_insert_breakpoint;
+ go32_ops.to_remove_breakpoint = memory_remove_breakpoint;
+ go32_ops.to_terminal_init = go32_terminal_init;
+ go32_ops.to_terminal_inferior = go32_terminal_inferior;
+ go32_ops.to_terminal_ours_for_output = go32_terminal_ours;
+ go32_ops.to_terminal_ours = go32_terminal_ours;
+ go32_ops.to_terminal_info = go32_terminal_info;
+ go32_ops.to_kill = go32_kill_inferior;
+ go32_ops.to_create_inferior = go32_create_inferior;
+ go32_ops.to_mourn_inferior = go32_mourn_inferior;
+ go32_ops.to_can_run = go32_can_run;
+ go32_ops.to_stop = go32_stop;
+ go32_ops.to_stratum = process_stratum;
+ go32_ops.to_has_all_memory = 1;
+ go32_ops.to_has_memory = 1;
+ go32_ops.to_has_stack = 1;
+ go32_ops.to_has_registers = 1;
+ go32_ops.to_has_execution = 1;
+ go32_ops.to_magic = OPS_MAGIC;
+
+ /* Initialize child's cwd with the current one. */
+ getcwd (child_cwd, sizeof (child_cwd));
+
+ /* Initialize child's command line storage. */
+ if (redir_debug_init (&child_cmd) == -1)
+ internal_error ("Cannot allocate redirection storage: not enough memory.\n");
+}
+
+void
+_initialize_go32_nat (void)
+{
+ init_go32_ops ();
+ add_target (&go32_ops);
+}
+
+pid_t
+tcgetpgrp (int fd)
+{
+ if (isatty (fd))
+ return SOME_PID;
+ errno = ENOTTY;
+ return -1;
+}
+
+int
+tcsetpgrp (int fd, pid_t pgid)
+{
+ if (isatty (fd) && pgid == SOME_PID)
+ return 0;
+ errno = pgid == SOME_PID ? ENOTTY : ENOSYS;
+ return -1;
+}
projects / deliverable / binutils-gdb.git / blobdiff