/*
* 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
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*/
/*
* Syscall argument mungers.
*
* The data to be munged has been explicitly copied in to the argument 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_wwwlw)
movl 8(%esp),%ecx // get &uu_args
xorl %edx,%edx
movl 20(%ecx),%eax
movl %eax,32(%ecx)
movl %edx,36(%ecx)
jmp Lwwwl
ENTRY(munge_wwwl)
movl 8(%esp),%ecx // get &uu_args
xorl %edx,%edx
Lwwwl:
movl 12(%ecx),%eax
movl %eax,24(%ecx)
movl 16(%ecx),%eax
movl %eax,28(%ecx)
jmp Lw3
ENTRY(munge_wwwwlw)
movl 8(%esp),%ecx // get &uu_args
xorl %edx,%edx
movl 24(%ecx),%eax
movl %eax,40(%ecx)
movl %edx,44(%ecx)
jmp Lwwwwl
ENTRY(munge_wwwwl)
movl 8(%esp),%ecx // get &uu_args
xorl %edx,%edx
Lwwwwl:
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_wwwwwwlw)
movl 8(%esp),%ecx // get &uu_args
xorl %edx,%edx
movl 32(%ecx),%eax
movl %eax,56(%ecx)
movl %edx,60(%ecx)
movl 24(%ecx),%eax
movl %eax,48(%ecx)
movl 28(%ecx),%eax
movl %eax,52(%ecx)
jmp Lw6
ENTRY(munge_wwwwwwll)
movl 8(%esp),%ecx // get &uu_args
xorl %edx,%edx
movl 32(%ecx),%eax
movl %eax,56(%ecx)
movl 36(%ecx),%eax
movl %eax,60(%ecx)
movl 24(%ecx),%eax
movl %eax,48(%ecx)
movl 28(%ecx),%eax
movl %eax,52(%ecx)
jmp Lw6
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
ENTRY(munge_llllll)
ret // actually, this method has nothing to do - all
// arguments are already 64-bits, with no mixing of
// args that need sign/zero extension