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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.
*/
#include <grub/cpu/gdb.h>
#include <grub/symbol.h>
#define EC_PRESENT 1
#define EC_ABSENT 0
#define GRUB_GDB_STACKSIZE 40000
#define SEP ,
#ifdef __APPLE__
.zerofill __DATA, __bss, LOCAL(grub_gdb_stack_end), GRUB_GDB_STACKSIZE, 4
LOCAL(grub_gdb_stack) = LOCAL(grub_gdb_stack_end)
#else
/*
* The .data index for the address vector.
*/
#define VECTOR 1
.bss
.space GRUB_GDB_STACKSIZE
VARIABLE(grub_gdb_stack)
#endif
/*
* Supplemental macros for register saving/restoration
* on exception handler entry/leave.
*/
#ifdef __APPLE__
.macro save32
#define REG $0
#define NDX $1
#else
.macro save32 reg ndx
#define REG \reg
#define NDX \ndx
#endif
movl REG, EXT_C(grub_gdb_regs)+(NDX * 4)
.endm
#undef REG
#undef NDX
#ifdef __APPLE__
.macro save16
#define REG $0
#define NDX $1
#else
.macro save16 reg ndx
#define REG \reg
#define NDX \ndx
#endif
xorl %eax, %eax
movw REG, EXT_C(grub_gdb_regs)+(NDX * 4)
movw %ax, EXT_C(grub_gdb_regs)+(NDX * 4 + 2)
movl EXT_C(grub_gdb_regs)+(EAX * 4), %eax
.endm
#undef REG
#undef NDX
#ifdef __APPLE__
.macro load32
#define NDX $0
#define REG $1
#else
.macro load32 ndx reg
#define REG \reg
#define NDX \ndx
#endif
movl EXT_C(grub_gdb_regs)+(NDX * 4), REG
.endm
#undef REG
#undef NDX
#ifdef __APPLE__
.macro load16
#define NDX $0
#define REG $1
#else
.macro load16 ndx reg
#define NDX \ndx
#define REG \reg
#endif
movw EXT_C(grub_gdb_regs)+(NDX * 4), REG
.endm
#undef REG
#undef NDX
.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.
*/
#ifdef __APPLE__
.macro ent
#define EC $0
#define BEG $1
#define END $2
#else
.macro ent ec beg end=0
#define EC \ec
#define BEG \beg
#define END \end
#endif
/*
* Wrapper body itself.
*/
.text
1:
.if EC
add MACRO_DOLLAR(4), %esp
.endif
save_context
#ifdef __APPLE__
mov $LOCAL(grub_gdb_stack), %esp
#else
mov $EXT_C(grub_gdb_stack), %esp
#endif
mov $(BEG), %eax /* trap number */
call EXT_C(grub_gdb_trap)
load_context
iret
/*
* Address entry in trapvec array.
*/
#ifdef __APPLE__
.section __DATA, VECTOR
#else
.data VECTOR
#endif
.long 1b
/*
* Next... (recursion).
*/
.if END-BEG > 0
#ifdef __APPLE__
ent EC, (BEG+1), END
#else
ent \ec "(\beg+1)" \end
#endif
.endif
.endm
/*
* Here does the actual construction of the address array and handlers
* take place.
*/
#ifdef __APPLE__
.section __DATA, VECTOR
#else
.data VECTOR
#endif
VARIABLE(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
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