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6291ad77 PM |
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 | |
1c79145f | 10 | * version 2.1 of the License, or (at your option) any later version. |
6291ad77 PM |
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 | */ | |
55c5063c MA |
20 | #ifndef SPARC_TARGET_CPU_H |
21 | #define SPARC_TARGET_CPU_H | |
6291ad77 | 22 | |
eb215f40 RH |
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 | ||
608999d1 RH |
29 | static inline void cpu_clone_regs_child(CPUSPARCState *env, target_ulong newsp, |
30 | unsigned flags) | |
6291ad77 | 31 | { |
2ad983e0 RH |
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 | ||
6291ad77 | 38 | if (newsp) { |
2ad983e0 RH |
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. */ | |
eb215f40 | 49 | /* Userspace provides a biased stack pointer value. */ |
2ad983e0 | 50 | env->regwptr[WREG_SP] = newsp; |
6291ad77 | 51 | } |
2ad983e0 RH |
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; | |
f5147c93 | 61 | #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32) |
2ad983e0 | 62 | env->xcc &= ~PSR_CARRY; |
f5147c93 | 63 | #else |
2ad983e0 | 64 | env->psr &= ~PSR_CARRY; |
f5147c93 | 65 | #endif |
2ad983e0 RH |
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; | |
6291ad77 PM |
72 | } |
73 | ||
07a6ecf4 RH |
74 | static inline void cpu_clone_regs_parent(CPUSPARCState *env, unsigned flags) |
75 | { | |
2ad983e0 RH |
76 | /* Set the second return value for the parent: %o1 = 0. */ |
77 | env->regwptr[WREG_O1] = 0; | |
07a6ecf4 RH |
78 | } |
79 | ||
f5147c93 PM |
80 | static inline void cpu_set_tls(CPUSPARCState *env, target_ulong newtls) |
81 | { | |
82 | env->gregs[7] = newtls; | |
83 | } | |
6291ad77 | 84 | |
9850f9f6 LV |
85 | static inline abi_ulong get_sp_from_cpustate(CPUSPARCState *state) |
86 | { | |
eb215f40 | 87 | return state->regwptr[WREG_SP] + TARGET_STACK_BIAS; |
9850f9f6 | 88 | } |
083244d3 | 89 | |
6291ad77 | 90 | #endif |