253 lines
4.2 KiB
ArmAsm
253 lines
4.2 KiB
ArmAsm
/* machdep.S - machine dependent assembly routines for the GDB stub */
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/*
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* Copyright (C) 2006 Lubomir Kundrak
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <grub/cpu/gdb.h>
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#include <grub/symbol.h>
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#define EC_PRESENT 1
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#define EC_ABSENT 0
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#define GRUB_GDB_STACKSIZE 40000
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#define SEP ,
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#ifdef __APPLE__
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.zerofill __DATA, __bss, LOCAL(grub_gdb_stack_end), GRUB_GDB_STACKSIZE, 4
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LOCAL(grub_gdb_stack) = LOCAL(grub_gdb_stack_end)
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#else
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/*
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* The .data index for the address vector.
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*/
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#define VECTOR 1
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.bss
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.space GRUB_GDB_STACKSIZE
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VARIABLE(grub_gdb_stack)
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#endif
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/*
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* Supplemental macros for register saving/restoration
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* on exception handler entry/leave.
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*/
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#ifdef __APPLE__
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.macro save32
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#define REG $0
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#define NDX $1
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#else
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.macro save32 reg ndx
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#define REG \reg
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#define NDX \ndx
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#endif
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movl REG, EXT_C(grub_gdb_regs)+(NDX * 4)
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.endm
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#undef REG
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#undef NDX
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#ifdef __APPLE__
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.macro save16
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#define REG $0
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#define NDX $1
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#else
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.macro save16 reg ndx
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#define REG \reg
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#define NDX \ndx
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#endif
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#ifdef __APPLE__
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xorl %eax, %eax
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#else
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movl $0, %eax
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#endif
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movw REG, EXT_C(grub_gdb_regs)+(NDX * 4)
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movw %ax, EXT_C(grub_gdb_regs)+(NDX * 4 + 2)
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movl EXT_C(grub_gdb_regs)+(EAX * 4), %eax
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.endm
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#undef REG
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#undef NDX
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#ifdef __APPLE__
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.macro load32
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#define NDX $0
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#define REG $1
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#else
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.macro load32 ndx reg
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#define REG \reg
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#define NDX \ndx
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#endif
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movl EXT_C(grub_gdb_regs)+(NDX * 4), REG
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.endm
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#undef REG
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#undef NDX
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#ifdef __APPLE__
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.macro load16
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#define NDX $0
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#define REG $1
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#else
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.macro load16 ndx reg
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#define NDX \ndx
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#define REG \reg
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#endif
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movw EXT_C(grub_gdb_regs)+(NDX * 4), REG
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.endm
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#undef REG
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#undef NDX
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.macro save_context
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save32 %eax, EAX
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save32 %ecx, ECX
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save32 %edx, EDX
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save32 %ebx, EBX
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save32 %ebp, EBP
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save32 %esi, ESI
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save32 %edi, EDI
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popl %ebx
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save32 %ebx, EIP
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popl %ebx
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save32 %ebx, CS
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popl %ebx
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save32 %ebx, EFLAGS
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save32 %esp, ESP
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save16 %ds, DS
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save16 %es, ES
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save16 %fs, FS
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save16 %gs, GS
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save16 %ss, SS
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.endm
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.macro load_context
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load16 SS, %ss
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load32 ESP, %esp
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load32 EBP, %ebp
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load32 ESI, %esi
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load32 EDI, %edi
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load16 DS, %ds
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load16 ES, %es
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load16 FS, %fs
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load16 GS, %gs
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load32 EFLAGS, %eax
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pushl %eax
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load32 CS, %eax
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pushl %eax
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load32 EIP, %eax
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pushl %eax
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load32 EBX, %ebx
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load32 EDX, %edx
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load32 ECX, %ecx
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load32 EAX, %eax
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.endm
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/*
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* This macro creates handlers for a given range of exception numbers
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* and adds their addresses to the grub_gdb_trapvec array.
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*/
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#ifdef __APPLE__
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.macro ent
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#define EC $0
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#define BEG $1
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#define END $2
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#else
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.macro ent ec beg end=0
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#define EC \ec
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#define BEG \beg
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#define END \end
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#endif
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/*
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* Wrapper body itself.
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*/
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.text
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1:
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.if EC
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#ifdef __APPLE__
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add $$4, %esp
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#else
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add $4, %esp
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#endif
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.endif
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save_context
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#ifdef __APPLE__
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mov $LOCAL(grub_gdb_stack), %esp
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#else
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mov $EXT_C(grub_gdb_stack), %esp
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#endif
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mov $(BEG), %eax /* trap number */
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call EXT_C(grub_gdb_trap)
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load_context
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iret
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/*
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* Address entry in trapvec array.
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*/
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#ifdef __APPLE__
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.section __DATA, VECTOR
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#else
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.data VECTOR
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#endif
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.long 1b
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/*
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* Next... (recursion).
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*/
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.if END-BEG > 0
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#ifdef __APPLE__
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ent EC, (BEG+1), END
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#else
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ent \ec "(\beg+1)" \end
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#endif
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.endif
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.endm
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/*
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* Here does the actual construction of the address array and handlers
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* take place.
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*/
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#ifdef __APPLE__
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.section __DATA, VECTOR
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#else
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.data VECTOR
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#endif
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VARIABLE(grub_gdb_trapvec)
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ent EC_ABSENT, 0, 7
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ent EC_PRESENT, 8
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ent EC_ABSENT, 9
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ent EC_PRESENT, 10, 14
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/*
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* You may have to split this further or as(1)
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* will complain about nesting being too deep.
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*/
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ent EC_ABSENT, 15, GRUB_GDB_LAST_TRAP
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