jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
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 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
23static 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
67static 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
73static inline void cpu_set_tls(CPUSPARCState *env, target_ulong newtls)
74{
75 env->gregs[7] = newtls;
76}
77
78static inline abi_ulong get_sp_from_cpustate(CPUSPARCState *state)
79{
80 return state->regwptr[WREG_SP];
81}
82
83#endif