Mercurial > pub > dyncall > dyncall
view dyncallback/dyncall_thunk_sparc32.c @ 417:237023a0b6f8 r1.3-RC2
- version bump in manual
author | Tassilo Philipp |
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date | Thu, 16 Dec 2021 16:13:03 +0100 |
parents | f5577f6bf97a |
children |
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/* Package: dyncall Library: dyncallback File: dyncallback/dyncall_thunk_sparc32.c Description: Thunk - Implementation for sparc32 License: Copyright (c) 2007-2018 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" void dcbInitThunk(DCThunk* p, void (*entry)()) { /* example ; put thunk pointer in g1 0: 03 00 00 00 sethi %hi(0), %g1 4: 82 10 60 00 or %g1, 0, %g1 ; use g2 for entry pointer and "call" it, b/c branch instructions can't handle 32bit addresses 8: 05 00 00 00 sethi %hi(0), %g2 12: 84 10 a0 00 or %g2, 0, %g2 ; jump - write link to %g0, effectively discarding it; also nop for delay slot 16: 81 c0 80 00 jmpl %g2, %g0 20: 01 00 00 00 nop */ p->code[0] = 0x03000000 | ((unsigned int)p >> 10); /* sethi %hi(p), %g1 -- hi 22 bits */ p->code[1] = 0x82106000 | ((unsigned int)p & 0x3ff); /* or %g1, <p&0x3ff>, %g1 -- lo 10 bits */ p->code[2] = 0x05000000 | ((unsigned int)entry >> 10); /* sethi %hi(entry), %g2 */ p->code[3] = 0x8410a000 | ((unsigned int)entry & 0x3ff); /* or %g2, <entry&0x3ff>, %g2 */ p->code[4] = 0x81c08000; /* jmpl %g2, %g0 -- discards link addr */ p->code[5] = 0x01000000; /* nop */ }