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gdb over serial by Lubomir Kundrak and cleaned-up/updated by me (phcoder)

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Also-By: Vladimir Serbinenko <phcoder@gmail.com>
This commit is contained in:
Lubomir Kundrak 2011-11-14 22:58:11 +01:00 committed by Vladimir 'phcoder' Serbinenko
parent 581ffa8a24
commit 66d6a7937b
9 changed files with 893 additions and 0 deletions
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10
grub-core/Makefile.core.def
View file

@ -1741,3 +1741,13 @@ module = {
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;
};

357
grub-core/gdb/cstub.c Normal file
View file

@ -0,0 +1,357 @@
/* 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, &regno) && *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);
}
}

90
grub-core/gdb/gdb.c Normal file
View file

@ -0,0 +1,90 @@
/* 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 ();
}

80
grub-core/gdb/i386/idt.c Normal file
View file

@ -0,0 +1,80 @@
/* 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");
}

173
grub-core/gdb/i386/machdep.S Normal file
View file

@ -0,0 +1,173 @@
/* 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

53
grub-core/gdb/i386/signal.c Normal file
View file

@ -0,0 +1,53 @@
/* 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];
}

12
grub-core/kern/i386/realmode.S
View file

@ -117,6 +117,12 @@ gdt:
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
@ -168,6 +174,9 @@ protcseg:
/* zero %eax */
xorl %eax, %eax
sidt realidt
lidt protidt
/* return on the old (or initialized) stack! */
ret
/*
@ -194,6 +203,9 @@ prot_to_real:
/* just in case, set GDT */
lgdt gdtdesc
sidt protidt
lidt realidt
/* save the protected mode stack */
movl %esp, %eax
movl %eax, protstack

39
include/grub/gdb.h Normal file
View file

@ -0,0 +1,39 @@
/* 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 */

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/* 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 */