Mercurial > pub > dyncall > dyncall
diff dyncallback/dyncall_thunk_mips.c @ 0:3e629dc19168
initial from svn dyncall-1745
author | Daniel Adler |
---|---|
date | Thu, 19 Mar 2015 22:24:28 +0100 |
parents | |
children | d0787f3b81fb |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/dyncallback/dyncall_thunk_mips.c Thu Mar 19 22:24:28 2015 +0100 @@ -0,0 +1,84 @@ +/* + + 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" + +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)()) +{ +/* + +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) + +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 + +} +