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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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80
grub-core/gdb/i386/idt.c Normal file
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/* 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
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/* 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
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/* 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];
}