2 * SPARC specific CPU ABI and functions for linux-user
4 * Copyright (C) 2003 Thomas M. Ogrisegg <tom@fnord.at>
5 * Copyright (C) 2003-2005 Fabrice Bellard
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.
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.
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/>.
20 #ifndef SPARC_TARGET_CPU_H
21 #define SPARC_TARGET_CPU_H
23 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
24 # define TARGET_STACK_BIAS 2047
26 # define TARGET_STACK_BIAS 0
29 static inline void cpu_clone_regs_child(CPUSPARCState
*env
, target_ulong newsp
,
33 * After cpu_copy, env->regwptr is pointing into the old env.
34 * Update the new cpu to use its own register window.
36 env
->regwptr
= env
->regbase
+ (env
->cwp
* 16);
39 /* When changing stacks, do it with clean register windows. */
41 env
->cansave
= env
->nwindows
- 2;
42 env
->cleanwin
= env
->nwindows
- 2;
45 env
->wim
= 1 << env
->cwp
;
47 /* ??? The kernel appears to copy one stack frame to the new stack. */
48 /* ??? The kernel force aligns the new stack. */
49 /* Userspace provides a biased stack pointer value. */
50 env
->regwptr
[WREG_SP
] = newsp
;
53 if (flags
& CLONE_VM
) {
55 * Syscall return for clone child: %o0 = 0 and clear CF since this
56 * counts as a success return value. Advance the PC past the syscall.
57 * For fork child, all of this happens in cpu_loop, and we must not
58 * do the pc advance twice.
60 env
->regwptr
[WREG_O0
] = 0;
61 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
62 env
->xcc
&= ~PSR_CARRY
;
64 env
->psr
&= ~PSR_CARRY
;
67 env
->npc
= env
->npc
+ 4;
70 /* Set the second return value for the child: %o1 = 1. */
71 env
->regwptr
[WREG_O1
] = 1;
74 static inline void cpu_clone_regs_parent(CPUSPARCState
*env
, unsigned flags
)
76 /* Set the second return value for the parent: %o1 = 0. */
77 env
->regwptr
[WREG_O1
] = 0;
80 static inline void cpu_set_tls(CPUSPARCState
*env
, target_ulong newtls
)
82 env
->gregs
[7] = newtls
;
85 static inline abi_ulong
get_sp_from_cpustate(CPUSPARCState
*state
)
87 return state
->regwptr
[WREG_SP
] + TARGET_STACK_BIAS
;