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53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2005 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#include "ume.h"
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/*
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Jump to a particular IP with a particular SP. This is intended
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to simulate the initial CPU state when the kernel starts an program
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after exec; it therefore also clears all the other registers.
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*/
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void jmp_with_stack(void (*eip)(void), Addr esp)
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{
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asm volatile (
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"movl %1, %%esp;" // set esp */
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"pushl %%eax;" // push esp */
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"xorl %%eax,%%eax;" // clear registers
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"xorl %%ebx,%%ebx;"
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"xorl %%ecx,%%ecx;"
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"xorl %%edx,%%edx;"
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"xorl %%esi,%%esi;"
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"xorl %%edi,%%edi;"
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"xorl %%ebp,%%ebp;"
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"ret" // return into entry
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: : "a" (eip), "r" (esp));
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// we should never get here
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for(;;)
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asm volatile("ud2");
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}
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