1 /* 2 * SPARC specific CPU ABI and functions for linux-user 3 * 4 * Copyright (C) 2003 Thomas M. Ogrisegg <tom@fnord.at> 5 * Copyright (C) 2003-2005 Fabrice Bellard 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 #ifndef SPARC_TARGET_CPU_H 21 #define SPARC_TARGET_CPU_H 22 23 static inline void cpu_clone_regs_child(CPUSPARCState *env, target_ulong newsp, 24 unsigned flags) 25 { 26 /* 27 * After cpu_copy, env->regwptr is pointing into the old env. 28 * Update the new cpu to use its own register window. 29 */ 30 env->regwptr = env->regbase + (env->cwp * 16); 31 32 if (newsp) { 33 /* When changing stacks, do it with clean register windows. */ 34 #ifdef TARGET_SPARC64 35 env->cansave = env->nwindows - 2; 36 env->cleanwin = env->nwindows - 2; 37 env->canrestore = 0; 38 #else 39 env->wim = 1 << env->cwp; 40 #endif 41 /* ??? The kernel appears to copy one stack frame to the new stack. */ 42 /* ??? The kernel force aligns the new stack. */ 43 env->regwptr[WREG_SP] = newsp; 44 } 45 46 if (flags & CLONE_VM) { 47 /* 48 * Syscall return for clone child: %o0 = 0 and clear CF since this 49 * counts as a success return value. Advance the PC past the syscall. 50 * For fork child, all of this happens in cpu_loop, and we must not 51 * do the pc advance twice. 52 */ 53 env->regwptr[WREG_O0] = 0; 54 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32) 55 env->xcc &= ~PSR_CARRY; 56 #else 57 env->psr &= ~PSR_CARRY; 58 #endif 59 env->pc = env->npc; 60 env->npc = env->npc + 4; 61 } 62 63 /* Set the second return value for the child: %o1 = 1. */ 64 env->regwptr[WREG_O1] = 1; 65 } 66 67 static inline void cpu_clone_regs_parent(CPUSPARCState *env, unsigned flags) 68 { 69 /* Set the second return value for the parent: %o1 = 0. */ 70 env->regwptr[WREG_O1] = 0; 71 } 72 73 static inline void cpu_set_tls(CPUSPARCState *env, target_ulong newtls) 74 { 75 env->gregs[7] = newtls; 76 } 77 78 static inline abi_ulong get_sp_from_cpustate(CPUSPARCState *state) 79 { 80 return state->regwptr[WREG_SP]; 81 } 82 83 #endif 84