vmsvga: don't process more than 1024 fifo commands at once
[qemu.git] / target-sparc / int32_helper.c
1 /*
2 * Sparc32 interrupt helpers
3 *
4 * Copyright (c) 2003-2005 Fabrice Bellard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library 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 GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "qemu/osdep.h"
21 #include "cpu.h"
22 #include "trace.h"
23 #include "sysemu/sysemu.h"
24 #include "exec/log.h"
25
26 #define DEBUG_PCALL
27
28 #ifdef DEBUG_PCALL
29 static const char * const excp_names[0x80] = {
30 [TT_TFAULT] = "Instruction Access Fault",
31 [TT_ILL_INSN] = "Illegal Instruction",
32 [TT_PRIV_INSN] = "Privileged Instruction",
33 [TT_NFPU_INSN] = "FPU Disabled",
34 [TT_WIN_OVF] = "Window Overflow",
35 [TT_WIN_UNF] = "Window Underflow",
36 [TT_UNALIGNED] = "Unaligned Memory Access",
37 [TT_FP_EXCP] = "FPU Exception",
38 [TT_DFAULT] = "Data Access Fault",
39 [TT_TOVF] = "Tag Overflow",
40 [TT_EXTINT | 0x1] = "External Interrupt 1",
41 [TT_EXTINT | 0x2] = "External Interrupt 2",
42 [TT_EXTINT | 0x3] = "External Interrupt 3",
43 [TT_EXTINT | 0x4] = "External Interrupt 4",
44 [TT_EXTINT | 0x5] = "External Interrupt 5",
45 [TT_EXTINT | 0x6] = "External Interrupt 6",
46 [TT_EXTINT | 0x7] = "External Interrupt 7",
47 [TT_EXTINT | 0x8] = "External Interrupt 8",
48 [TT_EXTINT | 0x9] = "External Interrupt 9",
49 [TT_EXTINT | 0xa] = "External Interrupt 10",
50 [TT_EXTINT | 0xb] = "External Interrupt 11",
51 [TT_EXTINT | 0xc] = "External Interrupt 12",
52 [TT_EXTINT | 0xd] = "External Interrupt 13",
53 [TT_EXTINT | 0xe] = "External Interrupt 14",
54 [TT_EXTINT | 0xf] = "External Interrupt 15",
55 [TT_TOVF] = "Tag Overflow",
56 [TT_CODE_ACCESS] = "Instruction Access Error",
57 [TT_DATA_ACCESS] = "Data Access Error",
58 [TT_DIV_ZERO] = "Division By Zero",
59 [TT_NCP_INSN] = "Coprocessor Disabled",
60 };
61 #endif
62
63 void sparc_cpu_do_interrupt(CPUState *cs)
64 {
65 SPARCCPU *cpu = SPARC_CPU(cs);
66 CPUSPARCState *env = &cpu->env;
67 int cwp, intno = cs->exception_index;
68
69 /* Compute PSR before exposing state. */
70 if (env->cc_op != CC_OP_FLAGS) {
71 cpu_get_psr(env);
72 }
73
74 #ifdef DEBUG_PCALL
75 if (qemu_loglevel_mask(CPU_LOG_INT)) {
76 static int count;
77 const char *name;
78
79 if (intno < 0 || intno >= 0x100) {
80 name = "Unknown";
81 } else if (intno >= 0x80) {
82 name = "Trap Instruction";
83 } else {
84 name = excp_names[intno];
85 if (!name) {
86 name = "Unknown";
87 }
88 }
89
90 qemu_log("%6d: %s (v=%02x)\n", count, name, intno);
91 log_cpu_state(cs, 0);
92 #if 0
93 {
94 int i;
95 uint8_t *ptr;
96
97 qemu_log(" code=");
98 ptr = (uint8_t *)env->pc;
99 for (i = 0; i < 16; i++) {
100 qemu_log(" %02x", ldub(ptr + i));
101 }
102 qemu_log("\n");
103 }
104 #endif
105 count++;
106 }
107 #endif
108 #if !defined(CONFIG_USER_ONLY)
109 if (env->psret == 0) {
110 if (cs->exception_index == 0x80 &&
111 env->def->features & CPU_FEATURE_TA0_SHUTDOWN) {
112 qemu_system_shutdown_request();
113 } else {
114 cpu_abort(cs, "Trap 0x%02x while interrupts disabled, Error state",
115 cs->exception_index);
116 }
117 return;
118 }
119 #endif
120 env->psret = 0;
121 cwp = cpu_cwp_dec(env, env->cwp - 1);
122 cpu_set_cwp(env, cwp);
123 env->regwptr[9] = env->pc;
124 env->regwptr[10] = env->npc;
125 env->psrps = env->psrs;
126 env->psrs = 1;
127 env->tbr = (env->tbr & TBR_BASE_MASK) | (intno << 4);
128 env->pc = env->tbr;
129 env->npc = env->pc + 4;
130 cs->exception_index = -1;
131
132 #if !defined(CONFIG_USER_ONLY)
133 /* IRQ acknowledgment */
134 if ((intno & ~15) == TT_EXTINT && env->qemu_irq_ack != NULL) {
135 env->qemu_irq_ack(env, env->irq_manager, intno);
136 }
137 #endif
138 }
139
140 #if !defined(CONFIG_USER_ONLY)
141 static void leon3_cache_control_int(CPUSPARCState *env)
142 {
143 uint32_t state = 0;
144
145 if (env->cache_control & CACHE_CTRL_IF) {
146 /* Instruction cache state */
147 state = env->cache_control & CACHE_STATE_MASK;
148 if (state == CACHE_ENABLED) {
149 state = CACHE_FROZEN;
150 trace_int_helper_icache_freeze();
151 }
152
153 env->cache_control &= ~CACHE_STATE_MASK;
154 env->cache_control |= state;
155 }
156
157 if (env->cache_control & CACHE_CTRL_DF) {
158 /* Data cache state */
159 state = (env->cache_control >> 2) & CACHE_STATE_MASK;
160 if (state == CACHE_ENABLED) {
161 state = CACHE_FROZEN;
162 trace_int_helper_dcache_freeze();
163 }
164
165 env->cache_control &= ~(CACHE_STATE_MASK << 2);
166 env->cache_control |= (state << 2);
167 }
168 }
169
170 void leon3_irq_manager(CPUSPARCState *env, void *irq_manager, int intno)
171 {
172 leon3_irq_ack(irq_manager, intno);
173 leon3_cache_control_int(env);
174 }
175 #endif