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GDB serial and backtrace support.

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* grub-core/kern/i386/realmode.S (real_to_prot): Reload IDT.
	(prot_to_real): Likewise.
	* grub-core/kern/i386/int.S (grub_bios_interrupt): Remove IDT reload.
	* grub-core/Makefile.core.def (backtrace): New module.
	(gdb): Likewise.
	* grub-core/gdb/cstub.c: New file.
	* grub-core/gdb/gdb.c: Likewise.
	* grub-core/gdb/i386/idt.c: Likewise.
	* grub-core/gdb/i386/machdep.S: Likewise.
	* grub-core/gdb/i386/signal.c: Likewise.
	* grub-core/lib/i386/backtrace.c: Likewise.
	* include/grub/backtrace.h: Likewise.
	* include/grub/gdb.h: Likewise.
	* include/grub/i386/gdb.h: Likewise.

	Also-By: Vladimir Serbinenko <phcoder@gmail.com>
This commit is contained in:
Lubomir Kundrak 2012-02-26 19:17:37 +01:00 • committed by Vladimir 'phcoder' Serbinenko
commit ff27c3dd5d
13 changed files with 1052 additions and 29 deletions
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87
grub-core/lib/i386/backtrace.c Normal file
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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB 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.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/misc.h>
#include <grub/command.h>
#include <grub/err.h>
#include <grub/dl.h>
#include <grub/mm.h>
#include <grub/term.h>
#include <grub/backtrace.h>
#define MAX_STACK_FRAME 102400
void
grub_backtrace_pointer (void *ebp)
{
void *ptr, *nptr;
unsigned i;
ptr = ebp;
while (1)
{
grub_printf ("%p: ", ptr);
grub_backtrace_print_address (((void **) ptr)[1]);
grub_printf (" (");
for (i = 0; i < 2; i++)
grub_printf ("%p,", ((void **)ptr) [i + 2]);
grub_printf ("%p)\n", ((void **)ptr) [i + 2]);
nptr = *(void **)ptr;
if (nptr < ptr || (void **) nptr - (void **) ptr > MAX_STACK_FRAME
|| nptr == ptr)
{
grub_printf ("Invalid stack frame at %p (%p)\n", ptr, nptr);
break;
}
ptr = nptr;
}
}
void
grub_backtrace (void)
{
#ifdef __x86_64__
asm volatile ("movq %rbp, %rdi\n"
"call grub_backtrace_pointer");
#else
asm volatile ("movl %ebp, %eax\n"
"call grub_backtrace_pointer");
#endif
}
static grub_err_t
grub_cmd_backtrace (grub_command_t cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char **args __attribute__ ((unused)))
{
grub_backtrace ();
return 0;
}
static grub_command_t cmd;
GRUB_MOD_INIT(backtrace)
{
cmd = grub_register_command ("backtrace", grub_cmd_backtrace,
0, "Print backtrace.");
}
GRUB_MOD_FINI(backtrace)
{
grub_unregister_command (cmd);
}