name = crc64;
common = lib/crc64.c;
};
+
+module = {
+ name = gdb;
+ common = gdb/cstub.c;
+ common = gdb/gdb.c;
+ i386 = gdb/i386/idt.c;
+ i386 = gdb/i386/machdep.S;
+ i386 = gdb/i386/signal.c;
+ enable = i386;
+};
\ No newline at end of file
--- /dev/null
+/* cstub.c - machine independent portion of remote GDB stub */
+/*
+ * Copyright (C) 2006 Lubomir Kundrak
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <grub/misc.h>
+#include <grub/cpu/gdb.h>
+#include <grub/gdb.h>
+#include <grub/serial.h>
+
+static const char hexchars[] = "0123456789abcdef";
+int grub_gdb_regs[GRUB_MACHINE_NR_REGS];
+
+#define GRUB_GDB_COMBUF_SIZE 400 /* At least sizeof(grub_gdb_regs)*2 are needed for
+ register packets. */
+static char grub_gdb_inbuf[GRUB_GDB_COMBUF_SIZE];
+static char grub_gdb_outbuf[GRUB_GDB_COMBUF_SIZE];
+
+struct grub_serial_port *grub_gdb_port;
+
+static int
+hex (char ch)
+{
+ if ((ch >= 'a') && (ch <= 'f'))
+ return (ch - 'a' + 10);
+ if ((ch >= '0') && (ch <= '9'))
+ return (ch - '0');
+ if ((ch >= 'A') && (ch <= 'F'))
+ return (ch - 'A' + 10);
+ return (-1);
+}
+
+/* Scan for the sequence $<data>#<checksum>. */
+static char *
+grub_gdb_getpacket (void)
+{
+ char *buffer = &grub_gdb_inbuf[0];
+ unsigned char checksum;
+ unsigned char xmitcsum;
+ int count;
+ int ch;
+
+ while (1)
+ {
+ /* Wait around for the start character, ignore all other
+ characters. */
+ while ((ch = grub_serial_port_fetch (grub_gdb_port)) != '$');
+
+ retry:
+ checksum = 0;
+ xmitcsum = -1;
+ count = 0;
+
+ /* Now read until a # or end of buffer is found. */
+ while (count < GRUB_GDB_COMBUF_SIZE)
+ {
+ do
+ ch = grub_serial_port_fetch (grub_gdb_port);
+ while (ch < 0);
+ if (ch == '$')
+ goto retry;
+ if (ch == '#')
+ break;
+ checksum += ch;
+ buffer[count] = ch;
+ count = count + 1;
+ }
+ buffer[count] = 0;
+ if (ch == '#')
+ {
+ do
+ ch = grub_serial_port_fetch (grub_gdb_port);
+ while (ch < 0);
+ xmitcsum = hex (ch) << 4;
+ do
+ ch = grub_serial_port_fetch (grub_gdb_port);
+ while (ch < 0);
+ xmitcsum += hex (ch);
+
+ if (checksum != xmitcsum)
+ grub_serial_port_put (grub_gdb_port, '-'); /* Failed checksum. */
+ else
+ {
+ grub_serial_port_put (grub_gdb_port, '+'); /* Successful transfer. */
+
+ /* If a sequence char is present, reply the sequence ID. */
+ if (buffer[2] == ':')
+ {
+ grub_serial_port_put (grub_gdb_port, buffer[0]);
+ grub_serial_port_put (grub_gdb_port, buffer[1]);
+
+ return &buffer[3];
+ }
+ return &buffer[0];
+ }
+ }
+ }
+}
+
+/* Send the packet in buffer. */
+static void
+grub_gdb_putpacket (char *buffer)
+{
+ grub_uint8_t checksum;
+
+ /* $<packet info>#<checksum>. */
+ do
+ {
+ char *ptr;
+ grub_serial_port_put (grub_gdb_port, '$');
+ checksum = 0;
+
+ for (ptr = buffer; *ptr; ptr++)
+ {
+ grub_serial_port_put (grub_gdb_port, *ptr);
+ checksum += *ptr;
+ }
+
+ grub_serial_port_put (grub_gdb_port, '#');
+ grub_serial_port_put (grub_gdb_port, hexchars[checksum >> 4]);
+ grub_serial_port_put (grub_gdb_port, hexchars[checksum & 0xf]);
+ }
+ while (grub_serial_port_fetch (grub_gdb_port) != '+');
+}
+
+/* Convert the memory pointed to by mem into hex, placing result in buf.
+ Return a pointer to the last char put in buf (NULL). */
+static char *
+grub_gdb_mem2hex (char *mem, char *buf, int count)
+{
+ int i;
+ unsigned char ch;
+
+ for (i = 0; i < count; i++)
+ {
+ ch = *mem++;
+ *buf++ = hexchars[ch >> 4];
+ *buf++ = hexchars[ch % 16];
+ }
+ *buf = 0;
+ return (buf);
+}
+
+/* Convert the hex array pointed to by buf into binary to be placed in mem.
+ Return a pointer to the character after the last byte written. */
+static char *
+grub_gdb_hex2mem (char *buf, char *mem, int count)
+{
+ int i;
+ unsigned char ch;
+
+ for (i = 0; i < count; i++)
+ {
+ ch = hex (*buf++) << 4;
+ ch = ch + hex (*buf++);
+ *mem++ = ch;
+ }
+ return (mem);
+}
+
+/* Convert hex characters to int and return the number of characters
+ processed. */
+static int
+grub_gdb_hex2int (char **ptr, int *int_value)
+{
+ int num_chars = 0;
+ int hex_value;
+
+ *int_value = 0;
+
+ while (**ptr)
+ {
+ hex_value = hex (**ptr);
+ if (hex_value >= 0)
+ {
+ *int_value = (*int_value << 4) | hex_value;
+ num_chars++;
+ }
+ else
+ break;
+
+ (*ptr)++;
+ }
+
+ return (num_chars);
+}
+
+/* This function does all command procesing for interfacing to gdb. */
+void
+grub_gdb_trap (int trap_no)
+{
+ int sig_no;
+ int stepping;
+ int addr;
+ int length;
+ char *ptr;
+ int newPC;
+
+ sig_no = grub_gdb_trap2sig (trap_no);
+
+ ptr = grub_gdb_outbuf;
+
+ /* Reply to host that an exception has occurred. */
+
+ *ptr++ = 'T'; /* Notify gdb with signo, PC, FP and SP. */
+
+ *ptr++ = hexchars[sig_no >> 4];
+ *ptr++ = hexchars[sig_no & 0xf];
+
+ /* Stack pointer. */
+ *ptr++ = hexchars[SP];
+ *ptr++ = ':';
+ ptr = grub_gdb_mem2hex ((char *) &grub_gdb_regs[ESP], ptr, 4);
+ *ptr++ = ';';
+
+ /* Frame pointer. */
+ *ptr++ = hexchars[FP];
+ *ptr++ = ':';
+ ptr = grub_gdb_mem2hex ((char *) &grub_gdb_regs[EBP], ptr, 4);
+ *ptr++ = ';';
+
+ /* Program counter. */
+ *ptr++ = hexchars[PC];
+ *ptr++ = ':';
+ ptr = grub_gdb_mem2hex ((char *) &grub_gdb_regs[PC], ptr, 4);
+ *ptr++ = ';';
+
+ *ptr = '\0';
+
+ grub_gdb_putpacket (grub_gdb_outbuf);
+
+ stepping = 0;
+
+ while (1)
+ {
+ grub_gdb_outbuf[0] = 0;
+ ptr = grub_gdb_getpacket ();
+
+ switch (*ptr++)
+ {
+ case '?':
+ grub_gdb_outbuf[0] = 'S';
+ grub_gdb_outbuf[1] = hexchars[sig_no >> 4];
+ grub_gdb_outbuf[2] = hexchars[sig_no % 16];
+ grub_gdb_outbuf[3] = 0;
+ break;
+
+ /* Return values of the CPU registers. */
+ case 'g':
+ grub_gdb_mem2hex ((char *) grub_gdb_regs, grub_gdb_outbuf,
+ sizeof (grub_gdb_regs));
+ break;
+
+ /* Set values of the CPU registers -- return OK. */
+ case 'G':
+ grub_gdb_hex2mem (ptr, (char *) grub_gdb_regs,
+ sizeof (grub_gdb_regs));
+ grub_strcpy (grub_gdb_outbuf, "OK");
+ break;
+
+ /* Set the value of a single CPU register -- return OK. */
+ case 'P':
+ {
+ int regno;
+
+ if (grub_gdb_hex2int (&ptr, ®no) && *ptr++ == '=')
+ if (regno >= 0 && regno < GRUB_MACHINE_NR_REGS)
+ {
+ grub_gdb_hex2mem (ptr, (char *) &grub_gdb_regs[regno], 4);
+ grub_strcpy (grub_gdb_outbuf, "OK");
+ break;
+ }
+ /* FIXME: GDB requires setting orig_eax. I don't know what's
+ this register is about. For now just simulate setting any
+ registers. */
+ grub_strcpy (grub_gdb_outbuf, /*"E01"*/ "OK");
+ break;
+ }
+
+ /* mAA..AA,LLLL: Read LLLL bytes at address AA..AA. */
+ case 'm':
+ /* Try to read %x,%x. Set ptr = 0 if successful. */
+ if (grub_gdb_hex2int (&ptr, &addr))
+ if (*(ptr++) == ',')
+ if (grub_gdb_hex2int (&ptr, &length))
+ {
+ ptr = 0;
+ grub_gdb_mem2hex ((char *) addr, grub_gdb_outbuf, length);
+ }
+ if (ptr)
+ grub_strcpy (grub_gdb_outbuf, "E01");
+ break;
+
+ /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA -- return OK. */
+ case 'M':
+ /* Try to read %x,%x. Set ptr = 0 if successful. */
+ if (grub_gdb_hex2int (&ptr, &addr))
+ if (*(ptr++) == ',')
+ if (grub_gdb_hex2int (&ptr, &length))
+ if (*(ptr++) == ':')
+ {
+ grub_gdb_hex2mem (ptr, (char *) addr, length);
+ grub_strcpy (grub_gdb_outbuf, "OK");
+ ptr = 0;
+ }
+ if (ptr)
+ {
+ grub_strcpy (grub_gdb_outbuf, "E02");
+ }
+ break;
+
+ /* sAA..AA: Step one instruction from AA..AA(optional). */
+ case 's':
+ stepping = 1;
+
+ /* cAA..AA: Continue at address AA..AA(optional). */
+ case 'c':
+ /* try to read optional parameter, pc unchanged if no parm */
+ if (grub_gdb_hex2int (&ptr, &addr))
+ grub_gdb_regs[PC] = addr;
+
+ newPC = grub_gdb_regs[PC];
+
+ /* Clear the trace bit. */
+ grub_gdb_regs[PS] &= 0xfffffeff;
+
+ /* Set the trace bit if we're stepping. */
+ if (stepping)
+ grub_gdb_regs[PS] |= 0x100;
+
+ return;
+
+ /* Kill the program. */
+ case 'k':
+ /* Do nothing. */
+ return;
+ }
+
+ /* Reply to the request. */
+ grub_gdb_putpacket (grub_gdb_outbuf);
+ }
+}
+
--- /dev/null
+/* gdb.c - gdb remote stub module */
+/*
+ * Copyright (C) 2003 Free Software Foundation, Inc.
+ * Copyright (C) 2006 Lubomir Kundrak
+ *
+ * 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <grub/types.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/normal.h>
+#include <grub/term.h>
+#include <grub/cpu/gdb.h>
+#include <grub/gdb.h>
+#include <grub/serial.h>
+#include <grub/i18n.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_err_t
+grub_cmd_gdbstub (struct grub_command *cmd __attribute__ ((unused)),
+ int argc, char **args)
+{
+ struct grub_serial_port *port;
+ if (argc < 1)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "port required");
+ port = grub_serial_find (args[0]);
+ if (!port)
+ return grub_errno;
+ grub_gdb_port = port;
+ grub_puts_ (N_("Now connect the remote debugger, please."));
+ grub_gdb_breakpoint ();
+ return 0;
+}
+
+static grub_err_t
+grub_cmd_gdbstop (struct grub_command *cmd __attribute__ ((unused)),
+ int argc __attribute__ ((unused)),
+ char **args __attribute__ ((unused)))
+{
+ grub_gdb_port = NULL;
+ return 0;
+}
+
+static grub_err_t
+grub_cmd_gdb_break (struct grub_command *cmd __attribute__ ((unused)),
+ int argc __attribute__ ((unused)),
+ char **args __attribute__ ((unused)))
+{
+ if (!grub_gdb_port)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "No GDB stub is running");
+ grub_gdb_breakpoint ();
+ return 0;
+}
+
+static grub_command_t cmd, cmd_stop, cmd_break;
+
+GRUB_MOD_INIT (gdb)
+{
+ grub_gdb_idtinit ();
+ cmd = grub_register_command ("gdbstub", grub_cmd_gdbstub,
+ N_("PORT"), N_("Start GDB stub on given port"));
+ cmd_break = grub_register_command ("gdbstub_break", grub_cmd_gdb_break,
+ 0, N_("Break into GDB"));
+ cmd_stop = grub_register_command ("gdbstub_stop", grub_cmd_gdbstop,
+ 0, N_("Stop GDB stub"));
+}
+
+GRUB_MOD_FINI (gdb)
+{
+ grub_unregister_command (cmd);
+ grub_unregister_command (cmd_stop);
+ grub_gdb_idtrestore ();
+}
+
--- /dev/null
+/* idt.c - routines for constructing IDT fot the GDB stub */
+/*
+ * Copyright (C) 2006 Lubomir Kundrak
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <grub/machine/memory.h>
+#include <grub/misc.h>
+#include <grub/cpu/gdb.h>
+#include <grub/gdb.h>
+
+static struct grub_cpu_interrupt_gate grub_gdb_idt[GRUB_GDB_LAST_TRAP + 1]
+ __attribute__ ((aligned(16)));
+
+/* Sets up a gate descriptor in the IDT table. */
+static void
+grub_idt_gate (struct grub_cpu_interrupt_gate *gate, void (*offset) (void),
+ grub_uint16_t selector, grub_uint8_t type, grub_uint8_t dpl)
+{
+ gate->offset_lo = (int) offset & 0xffff;
+ gate->selector = selector & 0xffff;
+ gate->unused = 0;
+ gate->gate = (type & 0x1f) | ((dpl & 0x3) << 5) | 0x80;
+ gate->offset_hi = ((int) offset >> 16) & 0xffff;
+}
+
+static struct grub_cpu_idt_descriptor grub_gdb_orig_idt_desc
+ __attribute__ ((aligned(16)));
+static struct grub_cpu_idt_descriptor grub_gdb_idt_desc
+ __attribute__ ((aligned(16)));
+
+/* Set up interrupt and trap handler descriptors in IDT. */
+void
+grub_gdb_idtinit (void)
+{
+ int i;
+ grub_uint16_t seg;
+
+ asm volatile ("xorl %%eax, %%eax\n"
+ "mov %%cs, %%ax\n" :"=a" (seg));
+
+ for (i = 0; i <= GRUB_GDB_LAST_TRAP; i++)
+ {
+ grub_idt_gate (&grub_gdb_idt[i],
+ grub_gdb_trapvec[i], seg,
+ GRUB_CPU_TRAP_GATE, 0);
+ }
+
+ grub_gdb_idt_desc.base = (grub_addr_t) grub_gdb_idt;
+ grub_gdb_idt_desc.limit = sizeof (grub_gdb_idt) - 1;
+ asm volatile ("sidt %0" : : "m" (grub_gdb_orig_idt_desc));
+ asm volatile ("lidt %0" : : "m" (grub_gdb_idt_desc));
+}
+
+void
+grub_gdb_idtrestore (void)
+{
+ asm volatile ("lidt %0" : : "m" (grub_gdb_orig_idt_desc));
+}
+
+void
+grub_gdb_breakpoint (void)
+{
+ int x = 1, y = 0;
+ (void) (x / y);
+ asm volatile ("int $3");
+}
--- /dev/null
+/* machdep.S - machine dependent assembly routines for the GDB stub */
+/*
+ * Copyright (C) 2006 Lubomir Kundrak
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define ASM 1
+#include <grub/cpu/gdb.h>
+
+#define EC_PRESENT 1
+#define EC_ABSENT 0
+
+#define GRUB_GDB_STACKSIZE 40000
+
+/*
+ * The .data index for the address vector.
+ */
+
+#define VECTOR 1
+
+ .globl grub_gdb_trap
+ .globl grub_gdb_regs
+
+ .bss
+ .globl grub_gdb_stack
+ .space GRUB_GDB_STACKSIZE
+grub_gdb_stack:
+
+/*
+ * Supplemental macros for register saving/restoration
+ * on exception handler entry/leave.
+ */
+
+.macro save32 reg ndx
+ movl \reg, grub_gdb_regs+(\ndx * 4)
+.endm
+
+.macro save16 reg ndx
+ mov $0, %eax
+ movw \reg, grub_gdb_regs+(\ndx * 4)
+ movw %ax, grub_gdb_regs+(\ndx * 4 + 2)
+ movl grub_gdb_regs+(EAX * 4), %eax
+.endm
+
+.macro load32 ndx reg
+ movl grub_gdb_regs+(\ndx * 4), \reg
+.endm
+
+.macro load16 ndx reg
+ movw grub_gdb_regs+(\ndx * 4), \reg
+.endm
+
+.macro save_context
+ save32 %eax EAX
+ save32 %ecx ECX
+ save32 %edx EDX
+ save32 %ebx EBX
+ save32 %ebp EBP
+ save32 %esi ESI
+ save32 %edi EDI
+
+ popl %ebx
+ save32 %ebx EIP
+ popl %ebx
+ save32 %ebx CS
+ popl %ebx
+ save32 %ebx EFLAGS
+
+ save32 %esp ESP
+
+ save16 %ds DS
+ save16 %es ES
+ save16 %fs FS
+ save16 %gs GS
+ save16 %ss SS
+.endm
+
+.macro load_context
+ load16 SS %ss
+ load32 ESP %esp
+
+ load32 EBP %ebp
+ load32 ESI %esi
+ load32 EDI %edi
+
+ load16 DS %ds
+ load16 ES %es
+ load16 FS %fs
+ load16 GS %gs
+
+ load32 EFLAGS %eax
+ pushl %eax
+ load32 CS %eax
+ pushl %eax
+ load32 EIP %eax
+ pushl %eax
+
+ load32 EBX %ebx
+ load32 EDX %edx
+ load32 ECX %ecx
+ load32 EAX %eax
+.endm
+
+/*
+ * This macro creates handlers for a given range of exception numbers
+ * and adds their addresses to the grub_gdb_trapvec array.
+ */
+
+.macro ent ec beg end=0
+
+ /*
+ * Wrapper body itself.
+ */
+
+ .text
+1:
+ .if \ec
+ add $4,%esp
+ .endif
+
+ save_context
+ mov $grub_gdb_stack, %esp
+ mov $\beg, %eax /* trap number */
+ call grub_gdb_trap
+ load_context
+ iret
+
+ /*
+ * Address entry in trapvec array.
+ */
+
+ .data VECTOR
+ .long 1b
+
+ /*
+ * Next... (recursion).
+ */
+
+ .if \end-\beg > 0
+ ent \ec "(\beg+1)" \end
+ .endif
+.endm
+
+/*
+ * Here does the actual construction of the address array and handlers
+ * take place.
+ */
+
+ .data VECTOR
+ .globl grub_gdb_trapvec
+grub_gdb_trapvec:
+ ent EC_ABSENT 0 7
+ ent EC_PRESENT 8
+ ent EC_ABSENT 9
+ ent EC_PRESENT 10 14
+ /*
+ * You may have to split this further or as(1)
+ * will complain about nesting being too deep.
+ */
+ ent EC_ABSENT 15 GRUB_GDB_LAST_TRAP
--- /dev/null
+/* idt.c - routines for constructing IDT fot the GDB stub */
+/*
+ * Copyright (C) 2006 Lubomir Kundrak
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <grub/machine/memory.h>
+#include <grub/misc.h>
+#include <grub/cpu/gdb.h>
+#include <grub/gdb.h>
+
+/* Converting CPU trap number to UNIX signal number as
+ described in System V ABI i386 Processor Supplement, 3-25. */
+int
+grub_gdb_trap2sig (int trap_no)
+{
+ const int signals[] = {
+ SIGFPE, /* 0: Divide error fault */
+ SIGTRAP, /* 1: Single step trap fault */
+ SIGABRT, /* 2: # Nonmaskable interrupt */
+ SIGTRAP, /* 3: Breakpoint trap */
+ SIGSEGV, /* 4: Overflow trap */
+ SIGSEGV, /* 5: Bounds check fault */
+ SIGILL, /* 6: Invalid opcode fault */
+ SIGFPE, /* 7: No coprocessor fault */
+ SIGABRT, /* 8: # Double fault abort */
+ SIGSEGV, /* 9: Coprocessor overrun abort */
+ SIGSEGV, /* 10: Invalid TSS fault */
+ SIGSEGV, /* 11: Segment not present fault */
+ SIGSEGV, /* 12: Stack exception fault */
+ SIGSEGV, /* 13: General protection fault abort */
+ SIGSEGV, /* 14: Page fault */
+ SIGABRT, /* 15: (reserved) */
+ SIGFPE, /* 16: Coprocessor error fault */
+ SIGUSR1 /* other */
+ };
+
+ return signals[trap_no < 17 ? trap_no : 17];
+}
+
gdtdesc:
.word 0x27 /* limit */
.long gdt /* addr */
+realidt:
+ .word 0
+ .long 0
+protidt:
+ .word 0
+ .long 0
/*
* These next two routines, "real_to_prot" and "prot_to_real" are structured
/* zero %eax */
xorl %eax, %eax
+ sidt realidt
+ lidt protidt
+
/* return on the old (or initialized) stack! */
ret
/*
/* just in case, set GDT */
lgdt gdtdesc
+ sidt protidt
+ lidt realidt
+
/* save the protected mode stack */
movl %esp, %eax
movl %eax, protstack
--- /dev/null
+/* gdb.h - Various definitions for the remote GDB stub */
+/*
+ * Copyright (C) 2006 Lubomir Kundrak
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef GRUB_GDB_HEADER
+#define GRUB_GDB_HEADER 1
+
+#define SIGFPE 8
+#define SIGTRAP 5
+#define SIGABRT 6
+#define SIGSEGV 11
+#define SIGILL 4
+#define SIGUSR1 30
+/* We probably don't need other ones. */
+
+struct grub_serial_port;
+
+extern struct grub_serial_port *grub_gdb_port;
+
+void grub_gdb_breakpoint (void);
+int grub_gdb_trap2sig (int);
+
+#endif /* ! GRUB_GDB_HEADER */
+
--- /dev/null
+/* i386/gdb.h - i386 specific definitions for the remote GDB stub */
+/*
+ * Copyright (C) 2006 Lubomir Kundrak
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef GRUB_GDB_CPU_HEADER
+#define GRUB_GDB_CPU_HEADER 1
+
+#define GRUB_GDB_LAST_TRAP 31
+/* You may have to edit the bottom of machdep.S when adjusting
+ GRUB_GDB_LAST_TRAP. */
+#define GRUB_MACHINE_NR_REGS 16
+
+#define EAX 0
+#define ECX 1
+#define EDX 2
+#define EBX 3
+#define ESP 4
+#define EBP 5
+#define ESI 6
+#define EDI 7
+#define EIP 8
+#define EFLAGS 9
+#define CS 10
+#define SS 11
+#define DS 12
+#define ES 13
+#define FS 14
+#define GS 15
+
+#define PC EIP
+#define FP EBP
+#define SP ESP
+#define PS EFLAGS
+
+#ifndef ASM
+
+#include <grub/gdb.h>
+
+#define GRUB_CPU_TRAP_GATE 15
+
+struct grub_cpu_interrupt_gate
+{
+ grub_uint16_t offset_lo;
+ grub_uint16_t selector;
+ grub_uint8_t unused;
+ grub_uint8_t gate;
+ grub_uint16_t offset_hi;
+} __attribute__ ((packed));
+
+struct grub_cpu_idt_descriptor
+{
+ grub_uint16_t limit;
+ grub_uint32_t base;
+} __attribute__ ((packed));
+
+extern void (*grub_gdb_trapvec[]) (void);
+void grub_gdb_breakpoint (void);
+void grub_gdb_idtinit (void);
+void grub_gdb_idtrestore (void);
+void grub_gdb_trap (int trap_no);
+
+#endif /* ! ASM */
+#endif /* ! GRUB_GDB_CPU_HEADER */
+
projects / thirdparty / grub.git / commitdiff
