Mercurial > pub > dyncall > dyncall
view dyncallback/dyncall_thunk_mips.c @ 141:e63089fe5bef
- todo update
- removed some duped code for plain* tests
author | cslag |
---|---|
date | Sat, 20 Aug 2016 09:47:45 +0200 |
parents | 1ce60358fbad |
children | bbefb8b8e74c |
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/* Package: dyncall Library: dyncallback File: dyncallback/dyncall_thunk_mips.c Description: Thunk - Implementation for MIPS License: Copyright (c) 2013-2015 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" static unsigned short hi16(x) { return ( (unsigned short) (((unsigned int)x)>>16UL) ); } static unsigned short lo16(x) { return ( (unsigned short) ((unsigned int)x) ); } void dcbInitThunk(DCThunk* p, void (*entry)()) { /* Thunk Register: $t4 ($12) According to o32abi: $t9 'The Linux/MIPS convention is that all PIC calls use t9 to hold the address of the called function.' [See MIPS Run, p.413] mips thunk code: lui $t4, %hi(p) lui $t9, %hi(entry) ori $t9, $t9, %lo(entry) jr $t9 ori $t4, $t4, %lo(p) ; branch delay slot thunk.o: file format elf32-tradbigmips Disassembly of section .text: 00000000 <thunk>: 0: 3c0c0000 lui t4,0x0 4: 3c190000 lui t9,0x0 8: 37390000 ori t9,t9,0x0 c: 03200008 jr t9 10: 00200825 move at,at 14: 358c0000 ori t4,t4,0x0 18: 00200825 move at,at 1c: 00200825 move at,at */ #if defined(DC__Endian_BIG) p->data[0] = 0x3c0c; p->data[1] = hi16(p); /* lui $t4, hi(p) */ p->data[2] = 0x3c19; p->data[3] = hi16(entry); /* lui $t9, hi(entry) */ p->data[4] = 0x3739; p->data[5] = lo16(entry); /* ori $t9, $t9, lo(entry) */ p->jump = 0x03200008; /* jr $t9 */ p->bddt[0] = 0x358c; p->bddt[1] = lo16(p); /* ori $t4, $t4, lo(p) - branch delay slot */ #else /* defined(DC__Endian_LITTLE) */ p->data[1] = 0x3c0c; p->data[0] = hi16(p); /* lui $t4, hi(p) */ p->data[3] = 0x3c19; p->data[2] = hi16(entry); /* lui $t9, hi(entry) */ p->data[5] = 0x3739; p->data[4] = lo16(entry); /* ori $t9, $t9, lo(entry) */ p->jump = 0x03200008; /* jr $t9 */ p->bddt[1] = 0x358c; p->bddt[0] = lo16(p); /* ori $t4, $t4, lo(p) - branch delay slot */ #endif }