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/*
Package: dyncall
Library: dyncallback
File: dyncallback/dyncall_thunk_ppc32.c
Description: Thunk - Implementation for ppc32
License:
Copyright (c) 2007-2011 Daniel Adler <dadler@uni-goettingen.de>,
Tassilo Philipp <tphilipp@potion-studios.com>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "dyncall_thunk.h"
unsigned short hi16(x) { return ( (unsigned short) (((unsigned int)x)>>16UL) ); }
unsigned short lo16(x) { return ( (unsigned short) ((unsigned int)x) ); }
void dcbInitThunk(DCThunk* p, void (*entry)())
{
/*
ppc32 thunk code:
lis r2 , HI16(p)
ori r2 , r2, LO16(p)
lwz r12, 20(r2)
mtctr r12
bctr
*/
p->code_load_hi = 0x3c40U; /* lis r2, HI16(p) */
p->addr_self_hi = hi16(p);
p->code_load_lo = 0x6042U; /* ori r2, r2, LO16(p) */
p->addr_self_lo = lo16(p);
p->code_jump[0] = 0x81820014U; /* lwz r12, 20(r2) */
p->code_jump[1] = 0x7d8903a6U; /* mtclr r12 */
p->code_jump[2] = 0x4e800420U; /* bctr */
p->addr_entry = entry;
}
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