linux-user/sparc/target_cpu.h

   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 2.1 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