mirror of
https://github.com/qemu/qemu.git
synced 2025-10-29 08:39:23 +00:00
eb215f40c2
Move TARGET_STACK_BIAS from signal.c. Generic code cares about the logical stack pointer, not the physical one that has a bias applied for sparc64. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20210426025334.1168495-6-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/*
|
|
* 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
|