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ca5d32a3 WL |
1 | /* |
2 | * arm cpu init and loop | |
3 | * | |
4 | * Copyright (c) 2013 Stacey D. Son | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #ifndef _TARGET_ARCH_CPU_H_ | |
21 | #define _TARGET_ARCH_CPU_H_ | |
22 | ||
23 | #include "target_arch.h" | |
2bd010c4 | 24 | #include "signal-common.h" |
ca5d32a3 WL |
25 | |
26 | #define TARGET_DEFAULT_CPU_MODEL "any" | |
27 | ||
28 | static inline void target_cpu_init(CPUARMState *env, | |
29 | struct target_pt_regs *regs) | |
30 | { | |
31 | int i; | |
32 | ||
33 | cpsr_write(env, regs->uregs[16], CPSR_USER | CPSR_EXEC, | |
34 | CPSRWriteByInstr); | |
35 | for (i = 0; i < 16; i++) { | |
36 | env->regs[i] = regs->uregs[i]; | |
37 | } | |
38 | } | |
39 | ||
06efe3bf WL |
40 | static inline void target_cpu_loop(CPUARMState *env) |
41 | { | |
67ccbe79 | 42 | int trapnr, si_signo, si_code; |
06efe3bf WL |
43 | CPUState *cs = env_cpu(env); |
44 | ||
45 | for (;;) { | |
46 | cpu_exec_start(cs); | |
47 | trapnr = cpu_exec(cs); | |
48 | cpu_exec_end(cs); | |
49 | process_queued_cpu_work(cs); | |
50 | switch (trapnr) { | |
70985aec | 51 | case EXCP_UDEF: |
5e02ded1 WL |
52 | case EXCP_NOCP: |
53 | case EXCP_INVSTATE: | |
54 | /* | |
55 | * See arm/arm/undefined.c undefinedinstruction(); | |
56 | * | |
57 | * A number of details aren't emulated (they likely don't matter): | |
58 | * o Misaligned PC generates ILL_ILLADR (these can't come from qemu) | |
59 | * o Thumb-2 instructions generate ILLADR | |
60 | * o Both modes implement coprocessor instructions, which we don't | |
61 | * do here. FreeBSD just implements them for the VFP coprocessor | |
62 | * and special kernel breakpoints, trace points, dtrace, etc. | |
63 | */ | |
64 | force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->regs[15]); | |
70985aec | 65 | break; |
8d450c9a | 66 | case EXCP_SWI: |
8d450c9a | 67 | { |
e555e709 WL |
68 | int ret; |
69 | abi_ulong params = get_sp_from_cpustate(env); | |
70 | int32_t syscall_nr = env->regs[7]; | |
71 | int32_t arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8; | |
8d450c9a | 72 | |
e555e709 WL |
73 | /* See arm/arm/syscall.c cpu_fetch_syscall_args() */ |
74 | if (syscall_nr == TARGET_FREEBSD_NR_syscall) { | |
75 | syscall_nr = env->regs[0]; | |
76 | arg1 = env->regs[1]; | |
77 | arg2 = env->regs[2]; | |
78 | arg3 = env->regs[3]; | |
79 | get_user_s32(arg4, params); | |
80 | params += sizeof(int32_t); | |
81 | get_user_s32(arg5, params); | |
82 | params += sizeof(int32_t); | |
83 | get_user_s32(arg6, params); | |
84 | params += sizeof(int32_t); | |
85 | get_user_s32(arg7, params); | |
86 | arg8 = 0; | |
87 | } else if (syscall_nr == TARGET_FREEBSD_NR___syscall) { | |
88 | syscall_nr = env->regs[0]; | |
89 | arg1 = env->regs[2]; | |
90 | arg2 = env->regs[3]; | |
91 | get_user_s32(arg3, params); | |
92 | params += sizeof(int32_t); | |
93 | get_user_s32(arg4, params); | |
94 | params += sizeof(int32_t); | |
95 | get_user_s32(arg5, params); | |
96 | params += sizeof(int32_t); | |
97 | get_user_s32(arg6, params); | |
98 | arg7 = 0; | |
99 | arg8 = 0; | |
100 | } else { | |
101 | arg1 = env->regs[0]; | |
102 | arg2 = env->regs[1]; | |
103 | arg3 = env->regs[2]; | |
104 | arg4 = env->regs[3]; | |
105 | get_user_s32(arg5, params); | |
106 | params += sizeof(int32_t); | |
107 | get_user_s32(arg6, params); | |
108 | params += sizeof(int32_t); | |
109 | get_user_s32(arg7, params); | |
110 | params += sizeof(int32_t); | |
111 | get_user_s32(arg8, params); | |
112 | } | |
113 | ret = do_freebsd_syscall(env, syscall_nr, arg1, arg2, arg3, | |
114 | arg4, arg5, arg6, arg7, arg8); | |
115 | /* | |
116 | * Compare to arm/arm/vm_machdep.c | |
117 | * cpu_set_syscall_retval() | |
118 | */ | |
119 | if (-TARGET_EJUSTRETURN == ret) { | |
8d450c9a | 120 | /* |
e555e709 WL |
121 | * Returning from a successful sigreturn syscall. |
122 | * Avoid clobbering register state. | |
8d450c9a | 123 | */ |
e555e709 WL |
124 | break; |
125 | } | |
126 | if (-TARGET_ERESTART == ret) { | |
127 | env->regs[15] -= env->thumb ? 2 : 4; | |
128 | break; | |
129 | } | |
130 | if ((unsigned int)ret >= (unsigned int)(-515)) { | |
131 | ret = -ret; | |
132 | cpsr_write(env, CPSR_C, CPSR_C, CPSRWriteByInstr); | |
133 | env->regs[0] = ret; | |
8d450c9a | 134 | } else { |
e555e709 WL |
135 | cpsr_write(env, 0, CPSR_C, CPSRWriteByInstr); |
136 | env->regs[0] = ret; /* XXX need to handle lseek()? */ | |
137 | /* env->regs[1] = 0; */ | |
8d450c9a WL |
138 | } |
139 | } | |
140 | break; | |
70985aec WL |
141 | case EXCP_INTERRUPT: |
142 | /* just indicate that signals should be handled asap */ | |
143 | break; | |
ef1412bd | 144 | case EXCP_PREFETCH_ABORT: |
ef1412bd | 145 | case EXCP_DATA_ABORT: |
67ccbe79 WL |
146 | /* |
147 | * See arm/arm/trap-v6.c prefetch_abort_handler() and | |
148 | * data_abort_handler() | |
149 | * | |
150 | * However, FreeBSD maps these to a generic value and then uses that | |
151 | * to maybe fault in pages in vm/vm_fault.c:vm_fault_trap(). I | |
152 | * believe that the indirection maps the same as Linux, but haven't | |
153 | * chased down every single possible indirection. | |
154 | */ | |
155 | ||
156 | /* For user-only we don't set TTBCR_EAE, so look at the FSR. */ | |
157 | switch (env->exception.fsr & 0x1f) { | |
158 | case 0x1: /* Alignment */ | |
159 | si_signo = TARGET_SIGBUS; | |
160 | si_code = TARGET_BUS_ADRALN; | |
161 | break; | |
162 | case 0x3: /* Access flag fault, level 1 */ | |
163 | case 0x6: /* Access flag fault, level 2 */ | |
164 | case 0x9: /* Domain fault, level 1 */ | |
165 | case 0xb: /* Domain fault, level 2 */ | |
166 | case 0xd: /* Permission fault, level 1 */ | |
167 | case 0xf: /* Permission fault, level 2 */ | |
168 | si_signo = TARGET_SIGSEGV; | |
169 | si_code = TARGET_SEGV_ACCERR; | |
170 | break; | |
171 | case 0x5: /* Translation fault, level 1 */ | |
172 | case 0x7: /* Translation fault, level 2 */ | |
173 | si_signo = TARGET_SIGSEGV; | |
174 | si_code = TARGET_SEGV_MAPERR; | |
175 | break; | |
176 | default: | |
177 | g_assert_not_reached(); | |
178 | } | |
179 | force_sig_fault(si_signo, si_code, env->exception.vaddress); | |
ef1412bd | 180 | break; |
70985aec | 181 | case EXCP_DEBUG: |
a3ed97ce WL |
182 | case EXCP_BKPT: |
183 | force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->regs[15]); | |
70985aec | 184 | break; |
70985aec WL |
185 | case EXCP_YIELD: |
186 | /* nothing to do here for user-mode, just resume guest code */ | |
187 | break; | |
c0d2691c WL |
188 | case EXCP_ATOMIC: |
189 | cpu_exec_step_atomic(cs); | |
190 | break; | |
06efe3bf WL |
191 | default: |
192 | fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n", | |
193 | trapnr); | |
194 | cpu_dump_state(cs, stderr, 0); | |
195 | abort(); | |
196 | } /* switch() */ | |
197 | process_pending_signals(env); | |
198 | } /* for (;;) */ | |
199 | } | |
200 | ||
e17d4c9a WL |
201 | static inline void target_cpu_clone_regs(CPUARMState *env, target_ulong newsp) |
202 | { | |
203 | if (newsp) { | |
204 | env->regs[13] = newsp; | |
205 | } | |
206 | env->regs[0] = 0; | |
207 | } | |
208 | ||
bab6ccc5 | 209 | static inline void target_cpu_reset(CPUArchState *env) |
ca5d32a3 WL |
210 | { |
211 | } | |
212 | ||
213 | #endif /* !_TARGET_ARCH_CPU_H */ |