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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc4/] [gcc/] [config/] [mep/] [mep-tramp.c] - Rev 593
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/* Trampoline support for MeP Copyright (C) 2004, 2007 Free Software Foundation, Inc. Contributed by Red Hat Inc. This file is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This file is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* 7a0a ldc $10,$pc c0ae000a lw $0,10($10) caae000e lw $10,14($10) 10ae jmp $10 00000000 static chain 00000000 function address */ static inline int cache_config_register(void) { int rv; asm ("ldc\t%0, $ccfg" : "=r" (rv)); return rv; } #define ICACHE_SIZE ((cache_config_register() >> 16) & 0x7f) #define DCACHE_SIZE (cache_config_register() & 0x7f) #define ICACHE_DATA_BASE 0x00300000 #define ICACHE_TAG_BASE 0x00310000 #define DCACHE_DATA_BASE 0x00320000 #define DCACHE_TAG_BASE 0x00330000 static inline void flush_dcache (int addr) { asm volatile ("cache\t0, (%0)" : : "r" (addr)); } void __mep_trampoline_helper (unsigned long *tramp, int function_address, int static_chain); void __mep_trampoline_helper (unsigned long *tramp, int function_address, int static_chain) { int dsize, isize; #ifdef __LITTLE_ENDIAN__ tramp[0] = 0xc0ae7a0a; tramp[1] = 0xcaae000a; tramp[2] = 0x10ae000e; #else tramp[0] = 0x7a0ac0ae; tramp[1] = 0x000acaae; tramp[2] = 0x000e10ae; #endif tramp[3] = static_chain; tramp[4] = function_address; dsize = DCACHE_SIZE; isize = ICACHE_SIZE; if (dsize) { flush_dcache ((int)tramp); flush_dcache ((int)tramp+16); } if (isize) { int imask = (isize * 1024) - 1; int tmask = ~imask; unsigned int i; volatile unsigned int *tags; imask &= 0xffe0; for (i=(unsigned int)tramp; i<(unsigned int)tramp+20; i+=16) { tags = (unsigned int *)(ICACHE_TAG_BASE + (i & imask)); if ((*tags & tmask) == (i & tmask)) *tags &= ~1; } } }
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