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1.1 root 1: /*
2: * M68K helper routines
3: *
4: * Copyright (c) 2007 CodeSourcery
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, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: */
20: #include "exec.h"
21:
22: #if defined(CONFIG_USER_ONLY)
23:
24: void do_interrupt(int is_hw)
25: {
26: env->exception_index = -1;
27: }
28:
29: #else
30:
31: extern int semihosting_enabled;
32:
33: #define MMUSUFFIX _mmu
34: #ifdef __s390__
35: # define GETPC() ((void*)((unsigned long)__builtin_return_address(0) & 0x7fffffffUL))
36: #else
37: # define GETPC() (__builtin_return_address(0))
38: #endif
39:
40: #define SHIFT 0
41: #include "softmmu_template.h"
42:
43: #define SHIFT 1
44: #include "softmmu_template.h"
45:
46: #define SHIFT 2
47: #include "softmmu_template.h"
48:
49: #define SHIFT 3
50: #include "softmmu_template.h"
51:
52: /* Try to fill the TLB and return an exception if error. If retaddr is
53: NULL, it means that the function was called in C code (i.e. not
54: from generated code or from helper.c) */
55: /* XXX: fix it to restore all registers */
56: void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
57: {
58: TranslationBlock *tb;
59: CPUState *saved_env;
60: unsigned long pc;
61: int ret;
62:
63: /* XXX: hack to restore env in all cases, even if not called from
64: generated code */
65: saved_env = env;
66: env = cpu_single_env;
67: ret = cpu_m68k_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
68: if (__builtin_expect(ret, 0)) {
69: if (retaddr) {
70: /* now we have a real cpu fault */
71: pc = (unsigned long)retaddr;
72: tb = tb_find_pc(pc);
73: if (tb) {
74: /* the PC is inside the translated code. It means that we have
75: a virtual CPU fault */
76: cpu_restore_state(tb, env, pc, NULL);
77: }
78: }
79: cpu_loop_exit();
80: }
81: env = saved_env;
82: }
83:
84: static void do_rte(void)
85: {
86: uint32_t sp;
87: uint32_t fmt;
88:
89: sp = env->aregs[7];
90: fmt = ldl_kernel(sp);
91: env->pc = ldl_kernel(sp + 4);
92: sp |= (fmt >> 28) & 3;
93: env->sr = fmt & 0xffff;
94: m68k_switch_sp(env);
95: env->aregs[7] = sp + 8;
96: }
97:
98: void do_interrupt(int is_hw)
99: {
100: uint32_t sp;
101: uint32_t fmt;
102: uint32_t retaddr;
103: uint32_t vector;
104:
105: fmt = 0;
106: retaddr = env->pc;
107:
108: if (!is_hw) {
109: switch (env->exception_index) {
110: case EXCP_RTE:
111: /* Return from an exception. */
112: do_rte();
113: return;
114: case EXCP_HALT_INSN:
115: if (semihosting_enabled
116: && (env->sr & SR_S) != 0
117: && (env->pc & 3) == 0
118: && lduw_code(env->pc - 4) == 0x4e71
119: && ldl_code(env->pc) == 0x4e7bf000) {
120: env->pc += 4;
121: do_m68k_semihosting(env, env->dregs[0]);
122: return;
123: }
124: env->halted = 1;
125: env->exception_index = EXCP_HLT;
126: cpu_loop_exit();
127: return;
128: }
129: if (env->exception_index >= EXCP_TRAP0
130: && env->exception_index <= EXCP_TRAP15) {
131: /* Move the PC after the trap instruction. */
132: retaddr += 2;
133: }
134: }
135:
136: vector = env->exception_index << 2;
137:
138: sp = env->aregs[7];
139:
140: fmt |= 0x40000000;
141: fmt |= (sp & 3) << 28;
142: fmt |= vector << 16;
143: fmt |= env->sr;
144:
145: env->sr |= SR_S;
146: if (is_hw) {
147: env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT);
148: env->sr &= ~SR_M;
149: }
150: m68k_switch_sp(env);
151:
152: /* ??? This could cause MMU faults. */
153: sp &= ~3;
154: sp -= 4;
155: stl_kernel(sp, retaddr);
156: sp -= 4;
157: stl_kernel(sp, fmt);
158: env->aregs[7] = sp;
159: /* Jump to vector. */
160: env->pc = ldl_kernel(env->vbr + vector);
161: }
162:
163: #endif
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