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/*
* SPARC specific CPU ABI and functions for linux-user
*
* Copyright (C) 2003 Thomas M. Ogrisegg <tom@fnord.at>
* Copyright (C) 2003-2005 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SPARC_TARGET_CPU_H
#define SPARC_TARGET_CPU_H
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
# define TARGET_STACK_BIAS 2047
#else
# define TARGET_STACK_BIAS 0
#endif
static inline void cpu_clone_regs_child(CPUSPARCState *env, target_ulong newsp,
unsigned flags)
{
/*
* After cpu_copy, env->regwptr is pointing into the old env.
* Update the new cpu to use its own register window.
*/
env->regwptr = env->regbase + (env->cwp * 16);
if (newsp) {
/* When changing stacks, do it with clean register windows. */
#ifdef TARGET_SPARC64
env->cansave = env->nwindows - 2;
env->cleanwin = env->nwindows - 2;
env->canrestore = 0;
#else
env->wim = 1 << env->cwp;
#endif
/* ??? The kernel appears to copy one stack frame to the new stack. */
/* ??? The kernel force aligns the new stack. */
/* Userspace provides a biased stack pointer value. */
env->regwptr[WREG_SP] = newsp;
}
if (flags & CLONE_VM) {
/*
* Syscall return for clone child: %o0 = 0 and clear CF since this
* counts as a success return value. Advance the PC past the syscall.
* For fork child, all of this happens in cpu_loop, and we must not
* do the pc advance twice.
*/
env->regwptr[WREG_O0] = 0;
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
env->xcc &= ~PSR_CARRY;
#else
env->psr &= ~PSR_CARRY;
#endif
env->pc = env->npc;
env->npc = env->npc + 4;
}
/* Set the second return value for the child: %o1 = 1. */
env->regwptr[WREG_O1] = 1;
}
static inline void cpu_clone_regs_parent(CPUSPARCState *env, unsigned flags)
{
/* Set the second return value for the parent: %o1 = 0. */
env->regwptr[WREG_O1] = 0;
}
static inline void cpu_set_tls(CPUSPARCState *env, target_ulong newtls)
{
env->gregs[7] = newtls;
}
static inline abi_ulong get_sp_from_cpustate(CPUSPARCState *state)
{
return state->regwptr[WREG_SP] + TARGET_STACK_BIAS;
}
#endif
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