+++ /dev/null
-/*
- * Coyright (c) 2005-2006 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
- */
-
-/*
- * Syscall argument mungers.
- *
- * The data to be munged has been explicitly copied in to the arguement area,
- * and will be munged in place in the uu_arg[] array. Because of this, the
- * functions all take the same arguments as their PPC equivalents, but the
- * first argument is ignored. These mungers are for 32-bit app's syscalls,
- * since 64-bit args are stored into the save area (which overlays the
- * uu_args) in the order the syscall ABI calls for.
- *
- * The issue is that the incoming args are 32-bit, but we must expand
- * them in place into 64-bit args, as if they were from a 64-bit process.
- *
- * There are several functions in this file. Each takes two parameters:
- *
- * void munge_XXXX( const void *regs, void *uu_args);
- *
- * The name of the function encodes the number and type of the parameters,
- * as follows:
- *
- * w = a 32-bit value such as an int or a 32-bit ptr, that does not
- * require sign extension. These are handled by zeroing a word
- * of output, and copying a word from input to output.
- *
- * s = a 32-bit value such as a long, which must be sign-extended to
- * a 64-bit long-long in the uu_args. These are handled by
- * loading a word of input and sign extending it to a double,
- * and storing two words of output.
- *
- * l = a 64-bit long-long. These are handled by copying two words
- * of input to the output.
- *
- * For example, "munge_wls" takes a word, a long-long, and a word. This
- * takes four words in the uu_arg[] area: the first word is in one, the
- * long-long takes two, and the final word is in the fourth. We store six
- * words: the low word is left in place, followed by a 0, followed by the
- * two words of the long-long, followed by the low word and the sign extended
- * high word of the preceeding low word.
- *
- * Because this is an in-place modification, we actually start at the end
- * of uu_arg[] and work our way back to the beginning of the array.
- *
- * As you can see, we save a lot of code by collapsing mungers that are
- * prefixes or suffixes of each other.
- */
-#include <i386/asm.h>
-
-ENTRY(munge_w)
- movl 8(%esp),%ecx // get &uu_args
- movl $0,4(%ecx)
- ret
-
-ENTRY(munge_ww)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- jmp Lw2
-ENTRY(munge_www)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- jmp Lw3
-ENTRY(munge_wwww)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- jmp Lw4
-ENTRY(munge_wwwww)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- jmp Lw5
-ENTRY(munge_wwwwww)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- jmp Lw6
-ENTRY(munge_wwwwwww)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- jmp Lw7
-ENTRY(munge_wwwwwwww)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- movl 28(%ecx),%eax
- movl %eax,56(%ecx)
- movl %edx,60(%ecx)
-Lw7:
- movl 24(%ecx),%eax
- movl %eax,48(%ecx)
- movl %edx,52(%ecx)
-Lw6:
- movl 20(%ecx),%eax
- movl %eax,40(%ecx)
- movl %edx,44(%ecx)
-Lw5:
- movl 16(%ecx),%eax
- movl %eax,32(%ecx)
- movl %edx,36(%ecx)
-Lw4:
- movl 12(%ecx),%eax
- movl %eax,24(%ecx)
- movl %edx,28(%ecx)
-Lw3:
- movl 8(%ecx),%eax
- movl %eax,16(%ecx)
- movl %edx,20(%ecx)
-Lw2:
- movl 4(%ecx),%eax
- movl %eax,8(%ecx)
- movl %edx,12(%ecx)
- movl %edx,4(%ecx)
- ret
-
-
-Entry(munge_wl) /* Costs an extra w move to do this */
-ENTRY(munge_wlw)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- movl 12(%ecx),%eax
- movl %eax,16(%ecx)
- movl %edx,20(%ecx)
- movl 8(%ecx),%eax
- movl %eax,12(%ecx)
- movl 4(%ecx),%eax
- movl %eax,8(%ecx)
- movl %edx,4(%ecx)
- ret
-
-ENTRY(munge_wwwl)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- movl 12(%ecx),%eax
- movl %eax,24(%ecx)
- movl 16(%ecx),%eax
- movl %eax,28(%ecx)
- jmp Lw3
-
-ENTRY(munge_wwwwl)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- movl 16(%ecx),%eax
- movl %eax,32(%ecx)
- movl 20(%ecx),%eax
- movl %eax,36(%ecx)
- jmp Lw4
-
-ENTRY(munge_wwwwwl)
- movl 8(%esp),%ecx // get &uu_args
- xorl %edx,%edx
- movl 20(%ecx),%eax
- movl %eax,40(%ecx)
- movl 24(%ecx),%eax
- movl %eax,44(%ecx)
- jmp Lw5
-
-ENTRY(munge_wsw)
- movl 8(%esp),%ecx // get &uu_args
- movl 8(%ecx),%eax
- movl %eax,16(%ecx)
- movl $0,20(%ecx)
- movl 4(%ecx),%eax
- cltd
- movl %eax,8(%ecx)
- movl %edx,12(%ecx)
- movl $0,4(%ecx)
- ret
-
-ENTRY(munge_wws)
- movl 8(%esp),%ecx // get &uu_args
- movl 8(%ecx),%eax
- cltd
- movl %eax,16(%ecx)
- movl %edx,20(%ecx)
- xorl %edx,%edx
- jmp Lw2
-
-ENTRY(munge_wwwsw)
- movl 8(%esp),%ecx // get &uu_args
- movl 16(%ecx),%eax
- movl %eax,32(%ecx)
- movl $0,36(%ecx)
- movl 12(%ecx),%eax
- cltd
- movl %eax,24(%ecx)
- movl %edx,28(%ecx)
- xorl %edx,%edx
- jmp Lw3
projects / apple / xnu.git / blobdiff