/* Native debugging support for Intel x86 running DJGPP.
- Copyright 1997, 1999, 2001 Free Software Foundation, Inc.
+ Copyright 1997, 1999, 2000, 2001 Free Software Foundation, Inc.
Written by Robert Hoehne.
This file is part of GDB.
#include "gdb_wait.h"
#include "gdbcore.h"
#include "command.h"
+#include "gdbcmd.h"
#include "floatformat.h"
#include "buildsym.h"
-#include "i387-nat.h"
+#include "i387-tdep.h"
+#include "i386-tdep.h"
+#include "value.h"
#include "regcache.h"
+#include "gdb_string.h"
-#include <stdio.h> /* required for __DJGPP_MINOR__ */
+#include <stdio.h> /* might be required for __DJGPP_MINOR__ */
#include <stdlib.h>
-#include <string.h>
+#include <ctype.h>
#include <errno.h>
#include <unistd.h>
+#include <sys/utsname.h>
#include <io.h>
+#include <dos.h>
#include <dpmi.h>
+#include <go32.h>
+#include <sys/farptr.h>
#include <debug/v2load.h>
#include <debug/dbgcom.h>
#if __DJGPP_MINOR__ > 2
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
+ asm ("inb $0xa0, %%al \n\
+ testb $0x20, %%al \n\
+ jz 1f \n\
+ xorb %%al, %%al \n\
+ outb %%al, $0xf0 \n\
+ movb $0x20, %%al \n\
+ outb %%al, $0xa0 \n\
+ outb %%al, $0x20 \n\
+1: \n\
+ fnsave %0 \n\
fwait "
: "=m" (npx)
: /* No input */
/* *INDENT-ON* */
-
-
-
/* ------------------------------------------------------------------------- */
/* Reload the contents of the NPX from the global variable `npx'. */
static void
load_npx (void)
{
-asm ("frstor %0":"=m" (npx));
+ asm ("frstor %0":"=m" (npx));
}
/* ------------------------------------------------------------------------- */
/* Stubs for the missing redirection functions. */
int redirected;
} cmdline_t;
-void redir_cmdline_delete (cmdline_t *ptr) {ptr->redirected = 0;}
-int redir_cmdline_parse (const char *args, cmdline_t *ptr)
+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)
+
+int
+redir_to_child (cmdline_t *ptr)
{
return 1;
}
-int redir_to_debugger (cmdline_t *ptr)
+
+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);
+int
+redir_debug_init (cmdline_t *ptr)
+{
+ return 0;
+}
+#endif /* __DJGPP_MINOR < 3 */
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 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_resume (ptid_t ptid, int step,
+ enum target_signal siggnal);
+static ptid_t go32_wait (ptid_t ptid,
+ 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_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 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_open (char *name ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED)
+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 ATTRIBUTE_UNUSED)
+go32_close (int quitting)
{
}
static void
-go32_attach (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED)
+go32_attach (char *args, int from_tty)
{
error ("\
You cannot attach to a running program on this platform.\n\
}
static void
-go32_detach (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED)
+go32_detach (char *args, int from_tty)
{
}
static int resume_signal = -1;
static void
-go32_resume (int pid ATTRIBUTE_UNUSED, int step, enum target_signal siggnal)
+go32_resume (ptid_t ptid, int step, enum target_signal siggnal)
{
int i;
static char child_cwd[FILENAME_MAX];
-static int
-go32_wait (int pid ATTRIBUTE_UNUSED, struct target_waitstatus *status)
+static ptid_t
+go32_wait (ptid_t ptid, struct target_waitstatus *status)
{
int i;
unsigned char saved_opcode;
if (!*child_cwd)
/* Initialize child's cwd with the current one. */
getcwd (child_cwd, sizeof (child_cwd));
-
+
chdir (child_cwd);
#if __DJGPP_MINOR__ < 3
}
}
}
- return SOME_PID;
+ return pid_to_ptid (SOME_PID);
}
static void
{
if (regno < FP0_REGNUM)
supply_register (regno, (char *) &a_tss + regno_mapping[regno].tss_ofs);
- else if (regno <= LAST_FPU_CTRL_REGNUM)
- i387_supply_register (regno, (char *) &npx);
+ else if (i386_fp_regnum_p (regno) || i386_fpc_regnum_p (regno))
+ i387_supply_fsave (current_regcache, regno, &npx);
else
internal_error (__FILE__, __LINE__,
"Invalid register no. %d in fetch_register.", regno);
{
for (regno = 0; regno < FP0_REGNUM; regno++)
fetch_register (regno);
- i387_supply_fsave ((char *) &npx);
+ i387_supply_fsave (current_regcache, -1, &npx);
}
}
static void
store_register (int regno)
{
- void *rp;
- void *v = (void *) ®isters[REGISTER_BYTE (regno)];
-
if (regno < FP0_REGNUM)
- memcpy ((char *) &a_tss + regno_mapping[regno].tss_ofs,
- v, regno_mapping[regno].size);
- else if (regno <= LAST_FPU_CTRL_REGNUM)
- i387_fill_fsave ((char *)&npx, regno);
+ regcache_collect (regno, (char *) &a_tss + regno_mapping[regno].tss_ofs);
+ else if (i386_fp_regnum_p (regno) || i386_fpc_regnum_p (regno))
+ i387_fill_fsave ((char *) &npx, regno);
else
internal_error (__FILE__, __LINE__,
"Invalid register no. %d in store_register.", regno);
static int
go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
- struct mem_attrib *attrib ATTRIBUTE_UNUSED,
- struct target_ops *target ATTRIBUTE_UNUSED)
+ struct mem_attrib *attrib, struct target_ops *target)
{
if (write)
{
static cmdline_t child_cmd; /* parsed child's command line kept here */
static void
-go32_files_info (struct target_ops *target ATTRIBUTE_UNUSED)
+go32_files_info (struct target_ops *target)
{
printf_unfiltered ("You are running a DJGPP V2 program.\n");
}
{
normal_stop ();
cleanup_client ();
- inferior_pid = 0;
+ inferior_ptid = null_ptid;
prog_has_started = 0;
}
static void
go32_create_inferior (char *exec_file, char *args, char **env)
{
+ extern char **environ;
jmp_buf start_state;
char *cmdline;
char **env_save = environ;
+ size_t cmdlen;
/* If no exec file handed to us, get it from the exec-file command -- with
a good, common error message if none is specified. */
else
child_cmd.command = xstrdup (args);
- cmdline = (char *) alloca (strlen (args) + 4);
- cmdline[0] = strlen (args);
+ cmdlen = strlen (args);
+ /* v2loadimage passes command lines via DOS memory, so it cannot
+ possibly handle commands longer than 1MB. */
+ if (cmdlen > 1024*1024)
+ error ("Command line too long.");
+
+ cmdline = xmalloc (cmdlen + 4);
strcpy (cmdline + 1, args);
- cmdline[strlen (args) + 1] = 13;
+ /* If the command-line length fits into DOS 126-char limits, use the
+ DOS command tail format; otherwise, tell v2loadimage to pass it
+ through a buffer in conventional memory. */
+ if (cmdlen < 127)
+ {
+ cmdline[0] = strlen (args);
+ cmdline[cmdlen + 1] = 13;
+ }
+ else
+ cmdline[0] = 0xff; /* signal v2loadimage it's a long command */
environ = env;
exit (1);
}
environ = env_save;
+ xfree (cmdline);
edi_init (start_state);
#if __DJGPP_MINOR__ < 3
save_npx ();
#endif
- inferior_pid = SOME_PID;
+ inferior_ptid = pid_to_ptid (SOME_PID);
push_target (&go32_ops);
clear_proceed_status ();
insert_breakpoints ();
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 ();
+ i386_cleanup_dregs ();
go32_kill_inferior ();
generic_mourn_inferior ();
}
/* 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 ATTRIBUTE_UNUSED, 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) == (unsigned)(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[4][4] =
- {
- { 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 a 386 debug register can watch. */
- size = size_try_array[len > 4 ? 3 : len - 1][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 = EINVAL;
- /* 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 ATTRIBUTE_UNUSED, 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) == (unsigned)(len_bits | read_write_bits))
- {
- dr_ref_count[i]--;
- if (dr_ref_count[i] == 0)
- DISABLE_REG (i);
- }
- }
- RESET_LOCAL_EXACT ();
- RESET_GLOBAL_EXACT ();
+#define CONTROL D_REGS[7]
+#define STATUS D_REGS[6]
- 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 ATTRIBUTE_UNUSED, int data_watchpoint)
+/* Pass the address ADDR to the inferior in the I'th debug register.
+ Here we just store the address in D_REGS, the watchpoint will be
+ actually set up when go32_wait runs the debuggee. */
+void
+go32_set_dr (int i, CORE_ADDR addr)
{
- 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;
+ if (i < 0 || i > 3)
+ internal_error (__FILE__, __LINE__,
+ "Invalid register %d in go32_set_dr.\n", i);
+ D_REGS[i] = addr;
}
-/* Remove a breakpoint. */
-
-int
-go32_remove_hw_breakpoint (CORE_ADDR addr, void *shadow ATTRIBUTE_UNUSED)
+/* Pass the value VAL to the inferior in the DR7 debug control
+ register. Here we just store the address in D_REGS, the watchpoint
+ will be actually set up when go32_wait runs the debuggee. */
+void
+go32_set_dr7 (unsigned val)
{
- 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;
+ CONTROL = val;
}
-int
-go32_insert_hw_breakpoint (CORE_ADDR addr, void *shadow ATTRIBUTE_UNUSED)
+/* Get the value of the DR6 debug status register from the inferior.
+ Here we just return the value stored in D_REGS, as we've got it
+ from the last go32_wait call. */
+unsigned
+go32_get_dr6 (void)
{
- int i;
-
- /* 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 : EBUSY;
+ return STATUS;
}
/* Put the device open on handle FD into either raw or cooked
}
static void
-go32_terminal_info (char *args ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED)
+go32_terminal_info (char *args, int from_tty)
{
printf_unfiltered ("Inferior's terminal is in %s mode.\n",
!inf_mode_valid
{
redir_to_debugger (&child_cmd);
error ("Cannot redirect standard handles for program: %s.",
- strerror (errno));
+ safe_strerror (errno));
}
/* set the console device of the inferior to whatever mode
(raw or cooked) we found it last time */
{
redir_to_child (&child_cmd);
error ("Cannot redirect standard handles for debugger: %s.",
- strerror (errno));
+ safe_strerror (errno));
}
}
}
processing_gcc_compilation = 2;
}
+unsigned short windows_major, windows_minor;
+
+/* Compute the version Windows reports via Int 2Fh/AX=1600h. */
+static void
+go32_get_windows_version(void)
+{
+ __dpmi_regs r;
+
+ r.x.ax = 0x1600;
+ __dpmi_int(0x2f, &r);
+ if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff
+ && (r.h.al > 3 || r.h.ah > 0))
+ {
+ windows_major = r.h.al;
+ windows_minor = r.h.ah;
+ }
+ else
+ windows_major = 0xff; /* meaning no Windows */
+}
+
+/* A subroutine of go32_sysinfo to display memory info. */
+static void
+print_mem (unsigned long datum, const char *header, int in_pages_p)
+{
+ if (datum != 0xffffffffUL)
+ {
+ if (in_pages_p)
+ datum <<= 12;
+ puts_filtered (header);
+ if (datum > 1024)
+ {
+ printf_filtered ("%lu KB", datum >> 10);
+ if (datum > 1024 * 1024)
+ printf_filtered (" (%lu MB)", datum >> 20);
+ }
+ else
+ printf_filtered ("%lu Bytes", datum);
+ puts_filtered ("\n");
+ }
+}
+
+/* Display assorted information about the underlying OS. */
+static void
+go32_sysinfo (char *arg, int from_tty)
+{
+ struct utsname u;
+ char cpuid_vendor[13];
+ unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx;
+ unsigned true_dos_version = _get_dos_version (1);
+ unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor;
+ int dpmi_flags;
+ char dpmi_vendor_info[129];
+ int dpmi_vendor_available =
+ __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info);
+ __dpmi_version_ret dpmi_version_data;
+ long eflags;
+ __dpmi_free_mem_info mem_info;
+ __dpmi_regs regs;
+
+ cpuid_vendor[0] = '\0';
+ if (uname (&u))
+ strcpy (u.machine, "Unknown x86");
+ else if (u.machine[0] == 'i' && u.machine[1] > 4)
+ {
+ /* CPUID with EAX = 0 returns the Vendor ID. */
+ __asm__ __volatile__ ("xorl %%ebx, %%ebx;"
+ "xorl %%ecx, %%ecx;"
+ "xorl %%edx, %%edx;"
+ "movl $0, %%eax;"
+ "cpuid;"
+ "movl %%ebx, %0;"
+ "movl %%edx, %1;"
+ "movl %%ecx, %2;"
+ "movl %%eax, %3;"
+ : "=m" (cpuid_vendor[0]),
+ "=m" (cpuid_vendor[4]),
+ "=m" (cpuid_vendor[8]),
+ "=m" (cpuid_max)
+ :
+ : "%eax", "%ebx", "%ecx", "%edx");
+ cpuid_vendor[12] = '\0';
+ }
+
+ printf_filtered ("CPU Type.......................%s", u.machine);
+ if (cpuid_vendor[0])
+ printf_filtered (" (%s)", cpuid_vendor);
+ puts_filtered ("\n");
+
+ /* CPUID with EAX = 1 returns processor signature and features. */
+ if (cpuid_max >= 1)
+ {
+ static char *brand_name[] = {
+ "",
+ " Celeron",
+ " III",
+ " III Xeon",
+ "", "", "", "",
+ " 4"
+ };
+ char cpu_string[80];
+ char cpu_brand[20];
+ unsigned brand_idx;
+ int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0;
+ int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0;
+ unsigned cpu_family, cpu_model;
+
+ __asm__ __volatile__ ("movl $1, %%eax;"
+ "cpuid;"
+ : "=a" (cpuid_eax),
+ "=b" (cpuid_ebx),
+ "=d" (cpuid_edx)
+ :
+ : "%ecx");
+ brand_idx = cpuid_ebx & 0xff;
+ cpu_family = (cpuid_eax >> 8) & 0xf;
+ cpu_model = (cpuid_eax >> 4) & 0xf;
+ cpu_brand[0] = '\0';
+ if (intel_p)
+ {
+ if (brand_idx > 0
+ && brand_idx < sizeof(brand_name)/sizeof(brand_name[0])
+ && *brand_name[brand_idx])
+ strcpy (cpu_brand, brand_name[brand_idx]);
+ else if (cpu_family == 5)
+ {
+ if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4)
+ strcpy (cpu_brand, " MMX");
+ else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1)
+ strcpy (cpu_brand, " OverDrive");
+ else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2)
+ strcpy (cpu_brand, " Dual");
+ }
+ else if (cpu_family == 6 && cpu_model < 8)
+ {
+ switch (cpu_model)
+ {
+ case 1:
+ strcpy (cpu_brand, " Pro");
+ break;
+ case 3:
+ strcpy (cpu_brand, " II");
+ break;
+ case 5:
+ strcpy (cpu_brand, " II Xeon");
+ break;
+ case 6:
+ strcpy (cpu_brand, " Celeron");
+ break;
+ case 7:
+ strcpy (cpu_brand, " III");
+ break;
+ }
+ }
+ }
+ else if (amd_p)
+ {
+ switch (cpu_family)
+ {
+ case 4:
+ strcpy (cpu_brand, "486/5x86");
+ break;
+ case 5:
+ switch (cpu_model)
+ {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ strcpy (cpu_brand, "-K5");
+ break;
+ case 6:
+ case 7:
+ strcpy (cpu_brand, "-K6");
+ break;
+ case 8:
+ strcpy (cpu_brand, "-K6-2");
+ break;
+ case 9:
+ strcpy (cpu_brand, "-K6-III");
+ break;
+ }
+ break;
+ case 6:
+ switch (cpu_model)
+ {
+ case 1:
+ case 2:
+ case 4:
+ strcpy (cpu_brand, " Athlon");
+ break;
+ case 3:
+ strcpy (cpu_brand, " Duron");
+ break;
+ }
+ break;
+ }
+ }
+ sprintf (cpu_string, "%s%s Model %d Stepping %d",
+ intel_p ? "Pentium" : (amd_p ? "AMD" : "ix86"),
+ cpu_brand, cpu_model, cpuid_eax & 0xf);
+ printfi_filtered (31, "%s\n", cpu_string);
+ if (((cpuid_edx & (6 | (0x0d << 23))) != 0)
+ || ((cpuid_edx & 1) == 0)
+ || (amd_p && (cpuid_edx & (3 << 30)) != 0))
+ {
+ puts_filtered ("CPU Features...................");
+ /* We only list features which might be useful in the DPMI
+ environment. */
+ if ((cpuid_edx & 1) == 0)
+ puts_filtered ("No FPU "); /* it's unusual to not have an FPU */
+ if ((cpuid_edx & (1 << 1)) != 0)
+ puts_filtered ("VME ");
+ if ((cpuid_edx & (1 << 2)) != 0)
+ puts_filtered ("DE ");
+ if ((cpuid_edx & (1 << 4)) != 0)
+ puts_filtered ("TSC ");
+ if ((cpuid_edx & (1 << 23)) != 0)
+ puts_filtered ("MMX ");
+ if ((cpuid_edx & (1 << 25)) != 0)
+ puts_filtered ("SSE ");
+ if ((cpuid_edx & (1 << 26)) != 0)
+ puts_filtered ("SSE2 ");
+ if (amd_p)
+ {
+ if ((cpuid_edx & (1 << 31)) != 0)
+ puts_filtered ("3DNow! ");
+ if ((cpuid_edx & (1 << 30)) != 0)
+ puts_filtered ("3DNow!Ext");
+ }
+ puts_filtered ("\n");
+ }
+ }
+ puts_filtered ("\n");
+ printf_filtered ("DOS Version....................%s %s.%s",
+ _os_flavor, u.release, u.version);
+ if (true_dos_version != advertized_dos_version)
+ printf_filtered (" (disguised as v%d.%d)", _osmajor, _osminor);
+ puts_filtered ("\n");
+ if (!windows_major)
+ go32_get_windows_version ();
+ if (windows_major != 0xff)
+ {
+ const char *windows_flavor;
+
+ printf_filtered ("Windows Version................%d.%02d (Windows ",
+ windows_major, windows_minor);
+ switch (windows_major)
+ {
+ case 3:
+ windows_flavor = "3.X";
+ break;
+ case 4:
+ switch (windows_minor)
+ {
+ case 0:
+ windows_flavor = "95, 95A, or 95B";
+ break;
+ case 3:
+ windows_flavor = "95B OSR2.1 or 95C OSR2.5";
+ break;
+ case 10:
+ windows_flavor = "98 or 98 SE";
+ break;
+ case 90:
+ windows_flavor = "ME";
+ break;
+ default:
+ windows_flavor = "9X";
+ break;
+ }
+ break;
+ default:
+ windows_flavor = "??";
+ break;
+ }
+ printf_filtered ("%s)\n", windows_flavor);
+ }
+ else if (true_dos_version == 0x532 && advertized_dos_version == 0x500)
+ printf_filtered ("Windows Version................Windows NT or Windows 2000\n");
+ puts_filtered ("\n");
+ if (dpmi_vendor_available == 0)
+ {
+ /* The DPMI spec says the vendor string should be ASCIIZ, but
+ I don't trust the vendors to follow that... */
+ if (!memchr (&dpmi_vendor_info[2], 0, 126))
+ dpmi_vendor_info[128] = '\0';
+ printf_filtered ("DPMI Host......................%s v%d.%d (capabilities: %#x)\n",
+ &dpmi_vendor_info[2],
+ (unsigned)dpmi_vendor_info[0],
+ (unsigned)dpmi_vendor_info[1],
+ ((unsigned)dpmi_flags & 0x7f));
+ }
+ __dpmi_get_version (&dpmi_version_data);
+ printf_filtered ("DPMI Version...................%d.%02d\n",
+ dpmi_version_data.major, dpmi_version_data.minor);
+ printf_filtered ("DPMI Info......................%s-bit DPMI, with%s Virtual Memory support\n",
+ (dpmi_version_data.flags & 1) ? "32" : "16",
+ (dpmi_version_data.flags & 4) ? "" : "out");
+ printfi_filtered (31, "Interrupts reflected to %s mode\n",
+ (dpmi_version_data.flags & 2) ? "V86" : "Real");
+ printfi_filtered (31, "Processor type: i%d86\n",
+ dpmi_version_data.cpu);
+ printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n",
+ dpmi_version_data.master_pic, dpmi_version_data.slave_pic);
+
+ /* a_tss is only initialized when the debuggee is first run. */
+ if (prog_has_started)
+ {
+ __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags));
+ printf_filtered ("Protection.....................Ring %d (in %s), with%s I/O protection\n",
+ a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT",
+ (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out");
+ }
+ puts_filtered ("\n");
+ __dpmi_get_free_memory_information (&mem_info);
+ print_mem (mem_info.total_number_of_physical_pages,
+ "DPMI Total Physical Memory.....", 1);
+ print_mem (mem_info.total_number_of_free_pages,
+ "DPMI Free Physical Memory......", 1);
+ print_mem (mem_info.size_of_paging_file_partition_in_pages,
+ "DPMI Swap Space................", 1);
+ print_mem (mem_info.linear_address_space_size_in_pages,
+ "DPMI Total Linear Address Size.", 1);
+ print_mem (mem_info.free_linear_address_space_in_pages,
+ "DPMI Free Linear Address Size..", 1);
+ print_mem (mem_info.largest_available_free_block_in_bytes,
+ "DPMI Largest Free Memory Block.", 0);
+
+ regs.h.ah = 0x48;
+ regs.x.bx = 0xffff;
+ __dpmi_int (0x21, ®s);
+ print_mem (regs.x.bx << 4, "Free DOS Memory................", 0);
+ regs.x.ax = 0x5800;
+ __dpmi_int (0x21, ®s);
+ if ((regs.x.flags & 1) == 0)
+ {
+ static const char *dos_hilo[] = {
+ "Low", "", "", "", "High", "", "", "", "High, then Low"
+ };
+ static const char *dos_fit[] = {
+ "First", "Best", "Last"
+ };
+ int hilo_idx = (regs.x.ax >> 4) & 0x0f;
+ int fit_idx = regs.x.ax & 0x0f;
+
+ if (hilo_idx > 8)
+ hilo_idx = 0;
+ if (fit_idx > 2)
+ fit_idx = 0;
+ printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n",
+ dos_hilo[hilo_idx], dos_fit[fit_idx]);
+ regs.x.ax = 0x5802;
+ __dpmi_int (0x21, ®s);
+ if ((regs.x.flags & 1) != 0)
+ regs.h.al = 0;
+ printfi_filtered (31, "UMBs %sin DOS memory chain\n",
+ regs.h.al == 0 ? "not " : "");
+ }
+}
+
+struct seg_descr {
+ unsigned short limit0 __attribute__((packed));
+ unsigned short base0 __attribute__((packed));
+ unsigned char base1 __attribute__((packed));
+ unsigned stype:5 __attribute__((packed));
+ unsigned dpl:2 __attribute__((packed));
+ unsigned present:1 __attribute__((packed));
+ unsigned limit1:4 __attribute__((packed));
+ unsigned available:1 __attribute__((packed));
+ unsigned dummy:1 __attribute__((packed));
+ unsigned bit32:1 __attribute__((packed));
+ unsigned page_granular:1 __attribute__((packed));
+ unsigned char base2 __attribute__((packed));
+};
+
+struct gate_descr {
+ unsigned short offset0 __attribute__((packed));
+ unsigned short selector __attribute__((packed));
+ unsigned param_count:5 __attribute__((packed));
+ unsigned dummy:3 __attribute__((packed));
+ unsigned stype:5 __attribute__((packed));
+ unsigned dpl:2 __attribute__((packed));
+ unsigned present:1 __attribute__((packed));
+ unsigned short offset1 __attribute__((packed));
+};
+
+/* Read LEN bytes starting at logical address ADDR, and put the result
+ into DEST. Return 1 if success, zero if not. */
+static int
+read_memory_region (unsigned long addr, void *dest, size_t len)
+{
+ unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds);
+ int retval = 1;
+
+ /* For the low memory, we can simply use _dos_ds. */
+ if (addr <= dos_ds_limit - len)
+ dosmemget (addr, len, dest);
+ else
+ {
+ /* For memory above 1MB we need to set up a special segment to
+ be able to access that memory. */
+ int sel = __dpmi_allocate_ldt_descriptors (1);
+
+ if (sel <= 0)
+ retval = 0;
+ else
+ {
+ int access_rights = __dpmi_get_descriptor_access_rights (sel);
+ size_t segment_limit = len - 1;
+
+ /* Make sure the crucial bits in the descriptor access
+ rights are set correctly. Some DPMI providers might barf
+ if we set the segment limit to something that is not an
+ integral multiple of 4KB pages if the granularity bit is
+ not set to byte-granular, even though the DPMI spec says
+ it's the host's responsibility to set that bit correctly. */
+ if (len > 1024 * 1024)
+ {
+ access_rights |= 0x8000;
+ /* Page-granular segments should have the low 12 bits of
+ the limit set. */
+ segment_limit |= 0xfff;
+ }
+ else
+ access_rights &= ~0x8000;
+
+ if (__dpmi_set_segment_base_address (sel, addr) != -1
+ && __dpmi_set_descriptor_access_rights (sel, access_rights) != -1
+ && __dpmi_set_segment_limit (sel, segment_limit) != -1
+ /* W2K silently fails to set the segment limit, leaving
+ it at zero; this test avoids the resulting crash. */
+ && __dpmi_get_segment_limit (sel) >= segment_limit)
+ movedata (sel, 0, _my_ds (), (unsigned)dest, len);
+ else
+ retval = 0;
+
+ __dpmi_free_ldt_descriptor (sel);
+ }
+ }
+ return retval;
+}
+
+/* Get a segment descriptor stored at index IDX in the descriptor
+ table whose base address is TABLE_BASE. Return the descriptor
+ type, or -1 if failure. */
+static int
+get_descriptor (unsigned long table_base, int idx, void *descr)
+{
+ unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */
+
+ if (read_memory_region (addr, descr, 8))
+ return (int)((struct seg_descr *)descr)->stype;
+ return -1;
+}
+
+struct dtr_reg {
+ unsigned short limit __attribute__((packed));
+ unsigned long base __attribute__((packed));
+};
+
+/* Display a segment descriptor stored at index IDX in a descriptor
+ table whose type is TYPE and whose base address is BASE_ADDR. If
+ FORCE is non-zero, display even invalid descriptors. */
+static void
+display_descriptor (unsigned type, unsigned long base_addr, int idx, int force)
+{
+ struct seg_descr descr;
+ struct gate_descr gate;
+
+ /* Get the descriptor from the table. */
+ if (idx == 0 && type == 0)
+ puts_filtered ("0x000: null descriptor\n");
+ else if (get_descriptor (base_addr, idx, &descr) != -1)
+ {
+ /* For each type of descriptor table, this has a bit set if the
+ corresponding type of selectors is valid in that table. */
+ static unsigned allowed_descriptors[] = {
+ 0xffffdafeL, /* GDT */
+ 0x0000c0e0L, /* IDT */
+ 0xffffdafaL /* LDT */
+ };
+
+ /* If the program hasn't started yet, assume the debuggee will
+ have the same CPL as the debugger. */
+ int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3;
+ unsigned long limit = (descr.limit1 << 16) | descr.limit0;
+
+ if (descr.present
+ && (allowed_descriptors[type] & (1 << descr.stype)) != 0)
+ {
+ printf_filtered ("0x%03x: ",
+ type == 1
+ ? idx : (idx * 8) | (type ? (cpl | 4) : 0));
+ if (descr.page_granular)
+ limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */
+ if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3
+ || descr.stype == 9 || descr.stype == 11
+ || (descr.stype >= 16 && descr.stype < 32))
+ printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx",
+ descr.base2, descr.base1, descr.base0, limit);
+
+ switch (descr.stype)
+ {
+ case 1:
+ case 3:
+ printf_filtered (" 16-bit TSS (task %sactive)",
+ descr.stype == 3 ? "" : "in");
+ break;
+ case 2:
+ puts_filtered (" LDT");
+ break;
+ case 4:
+ memcpy (&gate, &descr, sizeof gate);
+ printf_filtered ("selector=0x%04x offs=0x%04x%04x",
+ gate.selector, gate.offset1, gate.offset0);
+ printf_filtered (" 16-bit Call Gate (params=%d)",
+ gate.param_count);
+ break;
+ case 5:
+ printf_filtered ("TSS selector=0x%04x", descr.base0);
+ printfi_filtered (16, "Task Gate");
+ break;
+ case 6:
+ case 7:
+ memcpy (&gate, &descr, sizeof gate);
+ printf_filtered ("selector=0x%04x offs=0x%04x%04x",
+ gate.selector, gate.offset1, gate.offset0);
+ printf_filtered (" 16-bit %s Gate",
+ descr.stype == 6 ? "Interrupt" : "Trap");
+ break;
+ case 9:
+ case 11:
+ printf_filtered (" 32-bit TSS (task %sactive)",
+ descr.stype == 3 ? "" : "in");
+ break;
+ case 12:
+ memcpy (&gate, &descr, sizeof gate);
+ printf_filtered ("selector=0x%04x offs=0x%04x%04x",
+ gate.selector, gate.offset1, gate.offset0);
+ printf_filtered (" 32-bit Call Gate (params=%d)",
+ gate.param_count);
+ break;
+ case 14:
+ case 15:
+ memcpy (&gate, &descr, sizeof gate);
+ printf_filtered ("selector=0x%04x offs=0x%04x%04x",
+ gate.selector, gate.offset1, gate.offset0);
+ printf_filtered (" 32-bit %s Gate",
+ descr.stype == 14 ? "Interrupt" : "Trap");
+ break;
+ case 16: /* data segments */
+ case 17:
+ case 18:
+ case 19:
+ case 20:
+ case 21:
+ case 22:
+ case 23:
+ printf_filtered (" %s-bit Data (%s Exp-%s%s)",
+ descr.bit32 ? "32" : "16",
+ descr.stype & 2 ? "Read/Write," : "Read-Only, ",
+ descr.stype & 4 ? "down" : "up",
+ descr.stype & 1 ? "" : ", N.Acc");
+ break;
+ case 24: /* code segments */
+ case 25:
+ case 26:
+ case 27:
+ case 28:
+ case 29:
+ case 30:
+ case 31:
+ printf_filtered (" %s-bit Code (%s, %sConf%s)",
+ descr.bit32 ? "32" : "16",
+ descr.stype & 2 ? "Exec/Read" : "Exec-Only",
+ descr.stype & 4 ? "" : "N.",
+ descr.stype & 1 ? "" : ", N.Acc");
+ break;
+ default:
+ printf_filtered ("Unknown type 0x%02x", descr.stype);
+ break;
+ }
+ puts_filtered ("\n");
+ }
+ else if (force)
+ {
+ printf_filtered ("0x%03x: ",
+ type == 1
+ ? idx : (idx * 8) | (type ? (cpl | 4) : 0));
+ if (!descr.present)
+ puts_filtered ("Segment not present\n");
+ else
+ printf_filtered ("Segment type 0x%02x is invalid in this table\n",
+ descr.stype);
+ }
+ }
+ else if (force)
+ printf_filtered ("0x%03x: Cannot read this descriptor\n", idx);
+}
+
+static void
+go32_sldt (char *arg, int from_tty)
+{
+ struct dtr_reg gdtr;
+ unsigned short ldtr = 0;
+ int ldt_idx;
+ struct seg_descr ldt_descr;
+ long ldt_entry = -1L;
+ int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3;
+
+ if (arg && *arg)
+ {
+ while (*arg && isspace(*arg))
+ arg++;
+
+ if (*arg)
+ {
+ ldt_entry = parse_and_eval_long (arg);
+ if (ldt_entry < 0
+ || (ldt_entry & 4) == 0
+ || (ldt_entry & 3) != (cpl & 3))
+ error ("Invalid LDT entry 0x%03x.", ldt_entry);
+ }
+ }
+
+ __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ );
+ __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ );
+ ldt_idx = ldtr / 8;
+ if (ldt_idx == 0)
+ puts_filtered ("There is no LDT.\n");
+ /* LDT's entry in the GDT must have the type LDT, which is 2. */
+ else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2)
+ printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n",
+ ldt_descr.base0
+ | (ldt_descr.base1 << 16)
+ | (ldt_descr.base2 << 24));
+ else
+ {
+ unsigned base =
+ ldt_descr.base0
+ | (ldt_descr.base1 << 16)
+ | (ldt_descr.base2 << 24);
+ unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16);
+ int max_entry;
+
+ if (ldt_descr.page_granular)
+ /* Page-granular segments must have the low 12 bits of their
+ limit set. */
+ limit = (limit << 12) | 0xfff;
+ /* LDT cannot have more than 8K 8-byte entries, i.e. more than
+ 64KB. */
+ if (limit > 0xffff)
+ limit = 0xffff;
+
+ max_entry = (limit + 1) / 8;
+
+ if (ldt_entry >= 0)
+ {
+ if (ldt_entry > limit)
+ error ("Invalid LDT entry %#x: outside valid limits [0..%#x]",
+ ldt_entry, limit);
+
+ display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1);
+ }
+ else
+ {
+ int i;
+
+ for (i = 0; i < max_entry; i++)
+ display_descriptor (ldt_descr.stype, base, i, 0);
+ }
+ }
+}
+
+static void
+go32_sgdt (char *arg, int from_tty)
+{
+ struct dtr_reg gdtr;
+ long gdt_entry = -1L;
+ int max_entry;
+
+ if (arg && *arg)
+ {
+ while (*arg && isspace(*arg))
+ arg++;
+
+ if (*arg)
+ {
+ gdt_entry = parse_and_eval_long (arg);
+ if (gdt_entry < 0 || (gdt_entry & 7) != 0)
+ error ("Invalid GDT entry 0x%03x: not an integral multiple of 8.",
+ gdt_entry);
+ }
+ }
+
+ __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ );
+ max_entry = (gdtr.limit + 1) / 8;
+
+ if (gdt_entry >= 0)
+ {
+ if (gdt_entry > gdtr.limit)
+ error ("Invalid GDT entry %#x: outside valid limits [0..%#x]",
+ gdt_entry, gdtr.limit);
+
+ display_descriptor (0, gdtr.base, gdt_entry / 8, 1);
+ }
+ else
+ {
+ int i;
+
+ for (i = 0; i < max_entry; i++)
+ display_descriptor (0, gdtr.base, i, 0);
+ }
+}
+
+static void
+go32_sidt (char *arg, int from_tty)
+{
+ struct dtr_reg idtr;
+ long idt_entry = -1L;
+ int max_entry;
+
+ if (arg && *arg)
+ {
+ while (*arg && isspace(*arg))
+ arg++;
+
+ if (*arg)
+ {
+ idt_entry = parse_and_eval_long (arg);
+ if (idt_entry < 0)
+ error ("Invalid (negative) IDT entry %d.", idt_entry);
+ }
+ }
+
+ __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ );
+ max_entry = (idtr.limit + 1) / 8;
+ if (max_entry > 0x100) /* no more than 256 entries */
+ max_entry = 0x100;
+
+ if (idt_entry >= 0)
+ {
+ if (idt_entry > idtr.limit)
+ error ("Invalid IDT entry %#x: outside valid limits [0..%#x]",
+ idt_entry, idtr.limit);
+
+ display_descriptor (1, idtr.base, idt_entry, 1);
+ }
+ else
+ {
+ int i;
+
+ for (i = 0; i < max_entry; i++)
+ display_descriptor (1, idtr.base, i, 0);
+ }
+}
+
+/* Cached linear address of the base of the page directory. For
+ now, available only under CWSDPMI. Code based on ideas and
+static unsigned long pdbr;
+
+static unsigned long
+get_cr3 (void)
+{
+ unsigned offset;
+ unsigned taskreg;
+ unsigned long taskbase, cr3;
+ struct dtr_reg gdtr;
+
+ if (pdbr > 0 && pdbr <= 0xfffff)
+ return pdbr;
+
+ /* Get the linear address of GDT and the Task Register. */
+ __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ );
+ __asm__ __volatile__ ("str %0" : "=m" (taskreg) : /* no inputs */ );
+
+ /* Task Register is a segment selector for the TSS of the current
+ task. Therefore, it can be used as an index into the GDT to get
+ at the segment descriptor for the TSS. To get the index, reset
+ the low 3 bits of the selector (which give the CPL). Add 2 to the
+ offset to point to the 3 low bytes of the base address. */
+ offset = gdtr.base + (taskreg & 0xfff8) + 2;
+
+
+ /* CWSDPMI's task base is always under the 1MB mark. */
+ if (offset > 0xfffff)
+ return 0;
+
+ _farsetsel (_dos_ds);
+ taskbase = _farnspeekl (offset) & 0xffffffU;
+ taskbase += _farnspeekl (offset + 2) & 0xff000000U;
+ if (taskbase > 0xfffff)
+ return 0;
+
+ /* CR3 (a.k.a. PDBR, the Page Directory Base Register) is stored at
+ offset 1Ch in the TSS. */
+ cr3 = _farnspeekl (taskbase + 0x1c) & ~0xfff;
+ if (cr3 > 0xfffff)
+ {
+#if 0 /* not fullly supported yet */
+ /* The Page Directory is in UMBs. In that case, CWSDPMI puts
+ the first Page Table right below the Page Directory. Thus,
+ the first Page Table's entry for its own address and the Page
+ Directory entry for that Page Table will hold the same
+ physical address. The loop below searches the entire UMB
+ range of addresses for such an occurence. */
+ unsigned long addr, pte_idx;
+
+ for (addr = 0xb0000, pte_idx = 0xb0;
+ pte_idx < 0xff;
+ addr += 0x1000, pte_idx++)
+ {
+ if (((_farnspeekl (addr + 4 * pte_idx) & 0xfffff027) ==
+ (_farnspeekl (addr + 0x1000) & 0xfffff027))
+ && ((_farnspeekl (addr + 4 * pte_idx + 4) & 0xfffff000) == cr3))
+ {
+ cr3 = addr + 0x1000;
+ break;
+ }
+ }
+#endif
+
+ if (cr3 > 0xfffff)
+ cr3 = 0;
+ }
+
+ return cr3;
+}
+
+/* Return the N'th Page Directory entry. */
+static unsigned long
+get_pde (int n)
+{
+ unsigned long pde = 0;
+
+ if (pdbr && n >= 0 && n < 1024)
+ {
+ pde = _farpeekl (_dos_ds, pdbr + 4*n);
+ }
+ return pde;
+}
+
+/* Return the N'th entry of the Page Table whose Page Directory entry
+ is PDE. */
+static unsigned long
+get_pte (unsigned long pde, int n)
+{
+ unsigned long pte = 0;
+
+ /* pde & 0x80 tests the 4MB page bit. We don't support 4MB
+ page tables, for now. */
+ if ((pde & 1) && !(pde & 0x80) && n >= 0 && n < 1024)
+ {
+ pde &= ~0xfff; /* clear non-address bits */
+ pte = _farpeekl (_dos_ds, pde + 4*n);
+ }
+ return pte;
+}
+
+/* Display a Page Directory or Page Table entry. IS_DIR, if non-zero,
+ says this is a Page Directory entry. If FORCE is non-zero, display
+ the entry even if its Present flag is off. OFF is the offset of the
+ address from the page's base address. */
+static void
+display_ptable_entry (unsigned long entry, int is_dir, int force, unsigned off)
+{
+ if ((entry & 1) != 0)
+ {
+ printf_filtered ("Base=0x%05lx000", entry >> 12);
+ if ((entry & 0x100) && !is_dir)
+ puts_filtered (" Global");
+ if ((entry & 0x40) && !is_dir)
+ puts_filtered (" Dirty");
+ printf_filtered (" %sAcc.", (entry & 0x20) ? "" : "Not-");
+ printf_filtered (" %sCached", (entry & 0x10) ? "" : "Not-");
+ printf_filtered (" Write-%s", (entry & 8) ? "Thru" : "Back");
+ printf_filtered (" %s", (entry & 4) ? "Usr" : "Sup");
+ printf_filtered (" Read-%s", (entry & 2) ? "Write" : "Only");
+ if (off)
+ printf_filtered (" +0x%x", off);
+ puts_filtered ("\n");
+ }
+ else if (force)
+ printf_filtered ("Page%s not present or not supported; value=0x%lx.\n",
+ is_dir ? " Table" : "", entry >> 1);
+}
+
+static void
+go32_pde (char *arg, int from_tty)
+{
+ long pde_idx = -1, i;
+
+ if (arg && *arg)
+ {
+ while (*arg && isspace(*arg))
+ arg++;
+
+ if (*arg)
+ {
+ pde_idx = parse_and_eval_long (arg);
+ if (pde_idx < 0 || pde_idx >= 1024)
+ error ("Entry %ld is outside valid limits [0..1023].", pde_idx);
+ }
+ }
+
+ pdbr = get_cr3 ();
+ if (!pdbr)
+ puts_filtered ("Access to Page Directories is not supported on this system.\n");
+ else if (pde_idx >= 0)
+ display_ptable_entry (get_pde (pde_idx), 1, 1, 0);
+ else
+ for (i = 0; i < 1024; i++)
+ display_ptable_entry (get_pde (i), 1, 0, 0);
+}
+
+/* A helper function to display entries in a Page Table pointed to by
+ the N'th entry in the Page Directory. If FORCE is non-zero, say
+ something even if the Page Table is not accessible. */
+static void
+display_page_table (long n, int force)
+{
+ unsigned long pde = get_pde (n);
+
+ if ((pde & 1) != 0)
+ {
+ int i;
+
+ printf_filtered ("Page Table pointed to by Page Directory entry 0x%lx:\n", n);
+ for (i = 0; i < 1024; i++)
+ display_ptable_entry (get_pte (pde, i), 0, 0, 0);
+ puts_filtered ("\n");
+ }
+ else if (force)
+ printf_filtered ("Page Table not present; value=0x%lx.\n", pde >> 1);
+}
+
+static void
+go32_pte (char *arg, int from_tty)
+{
+ long pde_idx = -1, i;
+
+ if (arg && *arg)
+ {
+ while (*arg && isspace(*arg))
+ arg++;
+
+ if (*arg)
+ {
+ pde_idx = parse_and_eval_long (arg);
+ if (pde_idx < 0 || pde_idx >= 1024)
+ error ("Entry %d is outside valid limits [0..1023].", pde_idx);
+ }
+ }
+
+ pdbr = get_cr3 ();
+ if (!pdbr)
+ puts_filtered ("Access to Page Tables is not supported on this system.\n");
+ else if (pde_idx >= 0)
+ display_page_table (pde_idx, 1);
+ else
+ for (i = 0; i < 1024; i++)
+ display_page_table (i, 0);
+}
+
+static void
+go32_pte_for_address (char *arg, int from_tty)
+{
+ CORE_ADDR addr = 0, i;
+
+ if (arg && *arg)
+ {
+ while (*arg && isspace(*arg))
+ arg++;
+
+ if (*arg)
+ addr = parse_and_eval_address (arg);
+ }
+ if (!addr)
+ error_no_arg ("linear address");
+
+ pdbr = get_cr3 ();
+ if (!pdbr)
+ puts_filtered ("Access to Page Tables is not supported on this system.\n");
+ else
+ {
+ int pde_idx = (addr >> 22) & 0x3ff;
+ int pte_idx = (addr >> 12) & 0x3ff;
+ unsigned offs = addr & 0xfff;
+
+ printf_filtered ("Page Table entry for address 0x%llx:\n",
+ (unsigned long long)addr);
+ display_ptable_entry (get_pte (get_pde (pde_idx), pte_idx), 0, 1, offs);
+ }
+}
+
+static struct cmd_list_element *info_dos_cmdlist = NULL;
+
+static void
+go32_info_dos_command (char *args, int from_tty)
+{
+ help_list (info_dos_cmdlist, "info dos ", class_info, gdb_stdout);
+}
+
void
_initialize_go32_nat (void)
{
init_go32_ops ();
add_target (&go32_ops);
+
+ add_prefix_cmd ("dos", class_info, go32_info_dos_command,
+ "Print information specific to DJGPP (aka MS-DOS) debugging.",
+ &info_dos_cmdlist, "info dos ", 0, &infolist);
+
+ add_cmd ("sysinfo", class_info, go32_sysinfo,
+ "Display information about the target system, including CPU, OS, DPMI, etc.",
+ &info_dos_cmdlist);
+ add_cmd ("ldt", class_info, go32_sldt,
+ "Display entries in the LDT (Local Descriptor Table).\n"
+ "Entry number (an expression) as an argument means display only that entry.",
+ &info_dos_cmdlist);
+ add_cmd ("gdt", class_info, go32_sgdt,
+ "Display entries in the GDT (Global Descriptor Table).\n"
+ "Entry number (an expression) as an argument means display only that entry.",
+ &info_dos_cmdlist);
+ add_cmd ("idt", class_info, go32_sidt,
+ "Display entries in the IDT (Interrupt Descriptor Table).\n"
+ "Entry number (an expression) as an argument means display only that entry.",
+ &info_dos_cmdlist);
+ add_cmd ("pde", class_info, go32_pde,
+ "Display entries in the Page Directory.\n"
+ "Entry number (an expression) as an argument means display only that entry.",
+ &info_dos_cmdlist);
+ add_cmd ("pte", class_info, go32_pte,
+ "Display entries in Page Tables.\n"
+ "Entry number (an expression) as an argument means display only entries\n"
+ "from the Page Table pointed to by the specified Page Directory entry.",
+ &info_dos_cmdlist);
+ add_cmd ("address-pte", class_info, go32_pte_for_address,
+ "Display a Page Table entry for a linear address.\n"
+ "The address argument must be a linear address, after adding to\n"
+ "it the base address of the appropriate segment.\n"
+ "The base address of variables and functions in the debuggee's data\n"
+ "or code segment is stored in the variable __djgpp_base_address,\n"
+ "so use `__djgpp_base_address + (char *)&var' as the argument.\n"
+ "For other segments, look up their base address in the output of\n"
+ "the `info dos ldt' command.",
+ &info_dos_cmdlist);
}
pid_t
projects / binutils.git / blobdiff