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+ − 1 /*
+ − 2
+ − 3 Package: dyncall
+ − 4 Library: dyncallback
+ − 5 File: dyncallback/dyncall_thunk_sparc32.c
+ − 6 Description: Thunk - Implementation for sparc32
+ − 7 License:
+ − 8
155
+ − 9 Copyright (c) 2007-2016 Daniel Adler <dadler@uni-goettingen.de>,
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+ − 10 Tassilo Philipp <tphilipp@potion-studios.com>
+ − 11
+ − 12 Permission to use, copy, modify, and distribute this software for any
+ − 13 purpose with or without fee is hereby granted, provided that the above
+ − 14 copyright notice and this permission notice appear in all copies.
+ − 15
+ − 16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ − 17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ − 18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ − 19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ − 20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ − 21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ − 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ − 23
+ − 24 */
+ − 25
+ − 26
+ − 27 #include "dyncall_thunk.h"
+ − 28
+ − 29 void dcbInitThunk(DCThunk* p, void (*entry)())
+ − 30 {
155
+ − 31 /* example
+ − 32 ; put thunk pointer in g1
+ − 33 0: 03 00 00 00 sethi %hi(0), %g1
+ − 34 4: 82 10 60 00 or %g1, 0, %g1
+ − 35 ; use g2 for entry pointer and "call" it, b/c branch instructions can't handle 32bit addresses
+ − 36 8: 05 00 00 00 sethi %hi(0), %g2
+ − 37 12: 84 10 a0 00 or %g2, 0, %g2
+ − 38 ; jump - write link to %g0, effectively discarding it; also nop for delay slot
+ − 39 16: 81 c0 80 00 jmpl %g2, %g0
+ − 40 20: 01 00 00 00 nop
189
+ − 41 */
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+ − 42
+ − 43 p->code[0] = 0x03000000 | ((unsigned int)p >> 10); /* sethi %hi(p), %g1 -- hi 22 bits */
+ − 44 p->code[1] = 0x82106000 | ((unsigned int)p & 0x3ff); /* or %g1, <p&0x3ff>, %g1 -- lo 10 bits */
+ − 45 p->code[2] = 0x05000000 | ((unsigned int)entry >> 10); /* sethi %hi(entry), %g2 */
+ − 46 p->code[3] = 0x8410a000 | ((unsigned int)entry & 0x3ff); /* or %g2, <entry&0x3ff>, %g2 */
+ − 47 p->code[4] = 0x81c08000; /* jmpl %g2, %g0 -- discards link addr */
+ − 48 p->code[5] = 0x01000000; /* nop */
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+ − 49 }
+ − 50
