Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20211016' into staging
[qemu.git] / 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 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
24 # define TARGET_STACK_BIAS 2047
25 #else
26 # define TARGET_STACK_BIAS 0
27 #endif
28
29 static inline void cpu_clone_regs_child(CPUSPARCState *env, target_ulong newsp,
30 unsigned flags)
31 {
32 /*
33 * After cpu_copy, env->regwptr is pointing into the old env.
34 * Update the new cpu to use its own register window.
35 */
36 env->regwptr = env->regbase + (env->cwp * 16);
37
38 if (newsp) {
39 /* When changing stacks, do it with clean register windows. */
40 #ifdef TARGET_SPARC64
41 env->cansave = env->nwindows - 2;
42 env->cleanwin = env->nwindows - 2;
43 env->canrestore = 0;
44 #else
45 env->wim = 1 << env->cwp;
46 #endif
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;
51 }
52
53 if (flags & CLONE_VM) {
54 /*
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.
59 */
60 env->regwptr[WREG_O0] = 0;
61 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
62 env->xcc &= ~PSR_CARRY;
63 #else
64 env->psr &= ~PSR_CARRY;
65 #endif
66 env->pc = env->npc;
67 env->npc = env->npc + 4;
68 }
69
70 /* Set the second return value for the child: %o1 = 1. */
71 env->regwptr[WREG_O1] = 1;
72 }
73
74 static inline void cpu_clone_regs_parent(CPUSPARCState *env, unsigned flags)
75 {
76 /* Set the second return value for the parent: %o1 = 0. */
77 env->regwptr[WREG_O1] = 0;
78 }
79
80 static inline void cpu_set_tls(CPUSPARCState *env, target_ulong newtls)
81 {
82 env->gregs[7] = newtls;
83 }
84
85 static inline abi_ulong get_sp_from_cpustate(CPUSPARCState *state)
86 {
87 return state->regwptr[WREG_SP] + TARGET_STACK_BIAS;
88 }
89
90 #endif