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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,253 @@ /* 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 #ifdef __APPLE__ xorl %eax, %eax #else movl $0, %eax #endif 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 #ifdef __APPLE__ add $$4, %esp #else add $4, %esp #endif .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