aboutsummaryrefslogtreecommitdiff
path: root/gdb/go32-nat.c
diff options
context:
space:
mode:
Diffstat (limited to 'gdb/go32-nat.c')
-rw-r--r--gdb/go32-nat.c754
1 files changed, 754 insertions, 0 deletions
diff --git a/gdb/go32-nat.c b/gdb/go32-nat.c
new file mode 100644
index 0000000..782d240
--- /dev/null
+++ b/gdb/go32-nat.c
@@ -0,0 +1,754 @@
+/* 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 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 <fcntl.h>
+
+#include "defs.h"
+#include "frame.h" /* required by inferior.h */
+#include "inferior.h"
+#include "target.h"
+#include "wait.h"
+#include "gdbcore.h"
+#include "command.h"
+#include "floatformat.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <debug/v2load.h>
+#include <debug/dbgcom.h>
+
+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];
+};
+
+extern char **environ;
+
+#define SOME_PID 42
+
+/* FIXME add decls of all static functions here */
+
+static int prog_has_started = 0;
+
+static void
+print_387_status (unsigned short status, struct env387 *ep)
+{
+ 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);
+ 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 = 0; fpreg < 8; fpreg++)
+ {
+ long double val;
+
+ 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:
+ printf_unfiltered ("trap ");
+ break;
+ case 3:
+ printf_unfiltered ("empty ");
+ break;
+ }
+ for (i = 0; i < 8; i++)
+ printf_unfiltered ("%02x", ep->regs[fpreg][i]);
+
+ REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM + fpreg, builtin_type_long_double,
+ &ep->regs[fpreg], &val);
+
+ printf_unfiltered (" %LG\n", val);
+ }
+}
+
+void
+i386_go32_float_info (void)
+{
+ print_387_status (0, (struct env387 *) &npx);
+}
+
+#define r_ofs(x) ((int)(&(((TSS *)0)->x)))
+
+static struct
+{
+ int tss_ofs;
+ int size;
+}
+regno_mapping[] =
+{
+ r_ofs (tss_eax), 4,
+ 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,
+ 1, 10,
+ 2, 10,
+ 3, 10,
+ 4, 10,
+ 5, 10,
+ 6, 10,
+ 7, 10,
+ 0, 2,
+ 4, 2,
+ 8, 2,
+ 12, 4,
+ 16, 2,
+ 20, 4,
+ 24, 2
+};
+
+static struct
+ {
+ int go32_sig;
+ int gdb_sig;
+ }
+sig_map[] =
+{
+ 0, TARGET_SIGNAL_FPE,
+ 1, TARGET_SIGNAL_TRAP,
+ 2, TARGET_SIGNAL_UNKNOWN,
+ 3, TARGET_SIGNAL_TRAP,
+ 4, TARGET_SIGNAL_FPE,
+ 5, TARGET_SIGNAL_SEGV,
+ 6, TARGET_SIGNAL_ILL,
+ 7, TARGET_SIGNAL_FPE,
+ 8, TARGET_SIGNAL_SEGV,
+ 9, TARGET_SIGNAL_SEGV,
+ 10, TARGET_SIGNAL_BUS,
+ 11, TARGET_SIGNAL_SEGV,
+ 12, TARGET_SIGNAL_SEGV,
+ 13, TARGET_SIGNAL_ABRT,
+ 14, TARGET_SIGNAL_SEGV,
+ 16, TARGET_SIGNAL_FPE,
+ 31, TARGET_SIGNAL_ILL,
+ 0x75, TARGET_SIGNAL_FPE,
+ 0x79, TARGET_SIGNAL_INT,
+ 0x1b, TARGET_SIGNAL_INT,
+ -1, -1
+};
+
+static void
+go32_open (char *name, int from_tty)
+{
+ printf_unfiltered ("Use the `run' command to run go32 programs\n");
+}
+
+static void
+go32_close (int quitting)
+{
+}
+
+static void
+go32_attach (char *args, int from_tty)
+{
+ printf_unfiltered ("Use the `run' command to run go32 programs\n");
+}
+
+static void
+go32_detach (char *args, int from_tty)
+{
+}
+
+static int resume_is_step;
+
+static void
+go32_resume (int pid, int step, enum target_signal siggnal)
+ {
+ resume_is_step = step;
+ }
+
+static int
+go32_wait (int pid, struct target_waitstatus *status)
+{
+ int i;
+
+ if (resume_is_step)
+ a_tss.tss_eflags |= 0x0100;
+ else
+ a_tss.tss_eflags &= 0xfeff;
+
+ run_child ();
+
+ 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 ((status->value.sig = sig_map[i].gdb_sig) !=
+ TARGET_SIGNAL_TRAP)
+ status->kind = TARGET_WAITKIND_SIGNALLED;
+ 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.reg + regno_mapping[regno].tss_ofs);
+ else
+ {
+ printf_unfiltered ("Invalid register in go32_fetch_register(%d)",
+ regno);
+ exit (1);
+ }
+ }
+}
+
+static void
+store_register (int regno)
+{
+ void *rp;
+ void *v = (void *) &registers[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
+ {
+ printf_unfiltered ("Invalid register in store_register(%d)", regno);
+ exit (1);
+ }
+ 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 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)
+{
+ go32_stop ();
+ 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_kill_inferior ();
+ }
+
+ 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);
+
+ inferior_pid = SOME_PID;
+ push_target (&go32_ops);
+ clear_proceed_status ();
+ insert_breakpoints ();
+ proceed ((CORE_ADDR) - 1, TARGET_SIGNAL_0, 0);
+}
+
+static void
+go32_mourn_inferior (void)
+{
+ go32_kill_inferior ();
+ generic_mourn_inferior ();
+}
+
+static int
+go32_can_run (void)
+{
+ return 1;
+}
+
+static void
+ignore (void)
+{
+}
+
+static void
+ignore2 (char *a, int b)
+{
+}
+
+/* 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_READ 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 SET_BREAK(index,address) \
+ do {\
+ CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index));\
+ D_REGS[index] = address;\
+ } 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 WATCH_HIT(index) \
+ (\
+ (STATUS & (1 << index)) && \
+ (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index)))\
+ )
+
+#if 0 /* use debugging macro */
+#define SHOW_DR(text) \
+do { \
+ fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \
+ fprintf(stderr,"%08x %08x ",edi.dr[0],edi.dr[1]); \
+ fprintf(stderr,"%08x %08x ",edi.dr[2],edi.dr[3]); \
+ fprintf(stderr,"(%s)\n",#text); \
+} while (0)
+#else
+#define SHOW_DR(text) do {} while (0)
+#endif
+
+static int go32_insert_aligned_watchpoint (int pid, CORE_ADDR waddr,
+ CORE_ADDR addr, int len, int rw);
+
+static int go32_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr,
+ CORE_ADDR addr, int len, int rw);
+
+/* Insert a watchpoint. */
+
+int
+go32_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
+{
+ int ret = go32_insert_aligned_watchpoint (pid, addr, addr, len, rw);
+
+ SHOW_DR (insert_watch);
+ return ret;
+}
+
+static int
+go32_insert_aligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr,
+ int len, int rw)
+{
+ int i;
+ int read_write_bits, len_bits;
+
+ /* 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;
+
+ read_write_bits = ((rw & 1) ? DR_RW_READ : 0) | ((rw & 2) ? DR_RW_WRITE : 0);
+
+ if (len == 1)
+ len_bits = DR_LEN_1;
+ else if (len == 2)
+ {
+ if (addr % 2)
+ return go32_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+ len_bits = DR_LEN_2;
+ }
+ else if (len == 4)
+ {
+ if (addr % 4)
+ return go32_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+ len_bits = DR_LEN_4;
+ }
+ else
+ return go32_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+
+ SET_WATCH (i, addr, read_write_bits, len_bits);
+ LOCAL_ENABLE_REG (i);
+ SET_LOCAL_EXACT ();
+}
+
+static int
+go32_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr,
+ int len, int rw)
+{
+ int align;
+ int size;
+ int rv = 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];
+ rv = go32_insert_aligned_watchpoint (pid, waddr, addr, size, rw);
+ if (rv)
+ {
+ go32_remove_watchpoint (pid, waddr, size);
+ return rv;
+ }
+ addr += size;
+ len -= size;
+ }
+ return rv;
+}
+
+/* Remove a watchpoint. */
+
+int
+go32_remove_watchpoint (int pid, CORE_ADDR addr, int len)
+{
+ int i;
+
+ for (i = 0; i <= 3; i++)
+ {
+ if (D_REGS[i] == addr)
+ {
+ DISABLE_REG (i);
+ }
+ }
+ SHOW_DR (remove_watch);
+
+ return 0;
+}
+
+/* Check if stopped by a watchpoint. */
+
+CORE_ADDR
+go32_stopped_by_watchpoint (int pid)
+{
+ int i, ret = 0;
+ int status;
+
+ status = edi.dr[DR_STATUS];
+ SHOW_DR (stopped_by);
+ for (i = 0; i <= 3; i++)
+ {
+ if (WATCH_HIT (i))
+ {
+ SHOW_DR (HIT);
+ ret = D_REGS[i];
+ }
+ }
+ /* this is a hack to GDB. If we stopped at a hardware breakpoint,
+ the stop_pc must incremented by DECR_PC_AFTER_BREAK. I tried everything
+ with the DECR_PC_AFTER_HW_BREAK, but nothing works. */
+ /* This is probably fixed by jtc's recent patch -sts 2/19/99 */
+ if (STATUS && !ret)
+ stop_pc += DECR_PC_AFTER_BREAK;
+ STATUS = 0;
+
+ 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 (D_REGS[i] == addr)
+ {
+ DISABLE_REG (i);
+ }
+ }
+ SHOW_DR (remove_hw);
+ 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 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;
+
+ SET_BREAK (i, addr);
+ LOCAL_ENABLE_REG (i);
+ SHOW_DR (insert_hw);
+
+ return 0;
+}
+
+static struct target_ops go32_ops;
+
+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_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 = ignore;
+ go32_ops.to_terminal_inferior = ignore;
+ go32_ops.to_terminal_ours_for_output = ignore;
+ go32_ops.to_terminal_ours = ignore;
+ go32_ops.to_terminal_info = ignore2;
+ 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;
+}
+
+void
+_initialize_go32_nat (void)
+{
+ init_go32_ops ();
+ add_target (&go32_ops);
+}
generated by cgit v1.1 at 2024-11-25 21:22:54 +0000