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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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91 lines
3.0 KiB
ArmAsm
91 lines
3.0 KiB
ArmAsm
##--------------------------------------------------------------------##
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##--- Support routines for the JITter output. amd64/helpers.S ---##
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##--------------------------------------------------------------------##
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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) 2000-2004 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 "core_asm.h"
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/* ------------------ SIMULATED CPU HELPERS ------------------ */
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/* A stubs for a return which we want to catch: a signal return.
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returns and pthread returns. In the latter case, the thread's
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return value is in %EAX, so we pass this as the first argument
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to the request. In both cases we use the user request mechanism.
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You need to to read the definition of VALGRIND_MAGIC_SEQUENCE
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in valgrind.h to make sense of this.
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This isn't used in-place. It is copied into the client address space
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at an arbitary address. Therefore, this code must be completely
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position-independent.
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*/
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.global VG_(trampoline_code_start)
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.global VG_(trampoline_code_length)
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.global VG_(tramp_sigreturn_offset)
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.global VG_(tramp_syscall_offset)
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VG_(trampoline_code_start):
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sigreturn_start:
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subl $20, %esp # allocate arg block
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movl %esp, %edx # %edx == &_zzq_args[0]
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movl $VG_USERREQ__SIGNAL_RETURNS, 0(%edx) # request
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movl $0, 4(%edx) # arg1
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movl $0, 8(%edx) # arg2
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movl $0, 12(%edx) # arg3
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movl $0, 16(%edx) # arg4
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movl %edx, %eax
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# and now the magic sequence itself:
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roll $29, %eax
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roll $3, %eax
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rorl $27, %eax
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rorl $5, %eax
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roll $13, %eax
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roll $19, %eax
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# should never get here
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ud2
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# We can point our sysinfo stuff here
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.align 16
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syscall_start:
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/* unused on amd64 */
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tramp_code_end:
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.data
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VG_(trampoline_code_length):
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.long tramp_code_end - VG_(trampoline_code_start)
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VG_(tramp_sigreturn_offset):
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.long sigreturn_start - VG_(trampoline_code_start)
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VG_(tramp_syscall_offset):
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.long syscall_start - VG_(trampoline_code_start)
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.text
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/* Let the linker know we don't need an executable stack */
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.section .note.GNU-stack,"",@progbits
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##--------------------------------------------------------------------##
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##--- end ---##
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##--------------------------------------------------------------------##
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