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git.proxmox.com Git - mirror_qemu.git/blob - target-cris/op_helper.c
4 * Copyright (c) 2007 AXIS Communications
5 * Written by Edgar E. Iglesias
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.
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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
29 #if !defined(CONFIG_USER_ONLY)
31 #define MMUSUFFIX _mmu
34 #include "softmmu_template.h"
37 #include "softmmu_template.h"
40 #include "softmmu_template.h"
43 #include "softmmu_template.h"
45 /* Try to fill the TLB and return an exception if error. If retaddr is
46 NULL, it means that the function was called in C code (i.e. not
47 from generated code or from helper.c) */
48 /* XXX: fix it to restore all registers */
49 void tlb_fill (target_ulong addr
, int is_write
, int mmu_idx
, void *retaddr
)
56 /* XXX: hack to restore env in all cases, even if not called from
61 D(fprintf(logfile
, "%s pc=%x tpc=%x ra=%x\n", __func__
,
62 env
->pc
, env
->debug1
, retaddr
));
63 ret
= cpu_cris_handle_mmu_fault(env
, addr
, is_write
, mmu_idx
, 1);
66 /* now we have a real cpu fault */
67 pc
= (unsigned long)retaddr
;
70 /* the PC is inside the translated code. It means that we have
71 a virtual CPU fault */
72 cpu_restore_state(tb
, env
, pc
, NULL
);
74 /* Evaluate flags after retranslation. */
75 helper_top_evaluate_flags();
85 void helper_raise_exception(uint32_t index
)
87 env
->exception_index
= index
;
91 void helper_tlb_flush_pid(uint32_t pid
)
93 #if !defined(CONFIG_USER_ONLY)
95 if (pid
!= (env
->pregs
[PR_PID
] & 0xff))
96 cris_mmu_flush_pid(env
, env
->pregs
[PR_PID
]);
100 void helper_spc_write(uint32_t new_spc
)
102 #if !defined(CONFIG_USER_ONLY)
103 tlb_flush_page(env
, env
->pregs
[PR_SPC
]);
104 tlb_flush_page(env
, new_spc
);
108 void helper_dump(uint32_t a0
, uint32_t a1
, uint32_t a2
)
110 (fprintf(logfile
, "%s: a0=%x a1=%x\n", __func__
, a0
, a1
));
113 /* Used by the tlb decoder. */
114 #define EXTRACT_FIELD(src, start, end) \
115 (((src) >> start) & ((1 << (end - start + 1)) - 1))
117 void helper_movl_sreg_reg (uint32_t sreg
, uint32_t reg
)
120 srs
= env
->pregs
[PR_SRS
];
122 env
->sregs
[srs
][sreg
] = env
->regs
[reg
];
124 #if !defined(CONFIG_USER_ONLY)
125 if (srs
== 1 || srs
== 2) {
127 /* Writes to tlb-hi write to mm_cause as a side
129 env
->sregs
[SFR_RW_MM_TLB_HI
] = env
->regs
[reg
];
130 env
->sregs
[SFR_R_MM_CAUSE
] = env
->regs
[reg
];
132 else if (sreg
== 5) {
139 idx
= set
= env
->sregs
[SFR_RW_MM_TLB_SEL
];
144 /* We've just made a write to tlb_lo. */
145 lo
= env
->sregs
[SFR_RW_MM_TLB_LO
];
146 /* Writes are done via r_mm_cause. */
147 hi
= env
->sregs
[SFR_R_MM_CAUSE
];
149 vaddr
= EXTRACT_FIELD(env
->tlbsets
[srs
-1][set
][idx
].hi
,
151 vaddr
<<= TARGET_PAGE_BITS
;
152 tlb_v
= EXTRACT_FIELD(env
->tlbsets
[srs
-1][set
][idx
].lo
,
154 env
->tlbsets
[srs
- 1][set
][idx
].lo
= lo
;
155 env
->tlbsets
[srs
- 1][set
][idx
].hi
= hi
;
158 "tlb flush vaddr=%x v=%d pc=%x\n",
159 vaddr
, tlb_v
, env
->pc
));
160 tlb_flush_page(env
, vaddr
);
166 void helper_movl_reg_sreg (uint32_t reg
, uint32_t sreg
)
169 env
->pregs
[PR_SRS
] &= 3;
170 srs
= env
->pregs
[PR_SRS
];
172 #if !defined(CONFIG_USER_ONLY)
173 if (srs
== 1 || srs
== 2)
179 idx
= set
= env
->sregs
[SFR_RW_MM_TLB_SEL
];
184 /* Update the mirror regs. */
185 hi
= env
->tlbsets
[srs
- 1][set
][idx
].hi
;
186 lo
= env
->tlbsets
[srs
- 1][set
][idx
].lo
;
187 env
->sregs
[SFR_RW_MM_TLB_HI
] = hi
;
188 env
->sregs
[SFR_RW_MM_TLB_LO
] = lo
;
191 env
->regs
[reg
] = env
->sregs
[srs
][sreg
];
194 static void cris_ccs_rshift(CPUState
*env
)
198 /* Apply the ccs shift. */
199 ccs
= env
->pregs
[PR_CCS
];
200 ccs
= (ccs
& 0xc0000000) | ((ccs
& 0x0fffffff) >> 10);
203 /* Enter user mode. */
204 env
->ksp
= env
->regs
[R_SP
];
205 env
->regs
[R_SP
] = env
->pregs
[PR_USP
];
208 env
->pregs
[PR_CCS
] = ccs
;
211 void helper_rfe(void)
213 int rflag
= env
->pregs
[PR_CCS
] & R_FLAG
;
215 D(fprintf(logfile
, "rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
216 env
->pregs
[PR_ERP
], env
->pregs
[PR_PID
],
220 cris_ccs_rshift(env
);
222 /* RFE sets the P_FLAG only if the R_FLAG is not set. */
224 env
->pregs
[PR_CCS
] |= P_FLAG
;
227 void helper_rfn(void)
229 int rflag
= env
->pregs
[PR_CCS
] & R_FLAG
;
231 D(fprintf(logfile
, "rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
232 env
->pregs
[PR_ERP
], env
->pregs
[PR_PID
],
236 cris_ccs_rshift(env
);
238 /* Set the P_FLAG only if the R_FLAG is not set. */
240 env
->pregs
[PR_CCS
] |= P_FLAG
;
242 /* Always set the M flag. */
243 env
->pregs
[PR_CCS
] |= M_FLAG
;
246 static void evaluate_flags_writeback(uint32_t flags
)
250 /* Extended arithmetics, leave the z flag alone. */
252 if ((x
|| env
->cc_op
== CC_OP_ADDC
)
254 env
->cc_mask
&= ~Z_FLAG
;
256 /* all insn clear the x-flag except setf or clrf. */
257 env
->pregs
[PR_CCS
] &= ~(env
->cc_mask
| X_FLAG
);
258 flags
&= env
->cc_mask
;
259 env
->pregs
[PR_CCS
] |= flags
;
262 void helper_evaluate_flags_muls(void)
274 res
= env
->cc_result
;
276 dneg
= ((int32_t)res
) < 0;
278 mof
= env
->pregs
[PR_MOF
];
286 if ((dneg
&& mof
!= -1)
287 || (!dneg
&& mof
!= 0))
289 evaluate_flags_writeback(flags
);
292 void helper_evaluate_flags_mulu(void)
303 res
= env
->cc_result
;
305 mof
= env
->pregs
[PR_MOF
];
316 evaluate_flags_writeback(flags
);
319 void helper_evaluate_flags_mcp(void)
328 res
= env
->cc_result
;
330 if ((res
& 0x80000000L
) != 0L)
333 if (((src
& 0x80000000L
) == 0L)
334 && ((dst
& 0x80000000L
) == 0L))
338 else if (((src
& 0x80000000L
) != 0L) &&
339 ((dst
& 0x80000000L
) != 0L))
348 if (((src
& 0x80000000L
) != 0L)
349 && ((dst
& 0x80000000L
) != 0L))
351 if ((dst
& 0x80000000L
) != 0L
352 || (src
& 0x80000000L
) != 0L)
356 evaluate_flags_writeback(flags
);
359 void helper_evaluate_flags_alu_4(void)
369 /* Reconstruct the result. */
379 res
= env
->cc_result
;
383 if (env
->cc_op
== CC_OP_SUB
|| env
->cc_op
== CC_OP_CMP
)
386 if ((res
& 0x80000000L
) != 0L)
389 if (((src
& 0x80000000L
) == 0L)
390 && ((dst
& 0x80000000L
) == 0L))
394 else if (((src
& 0x80000000L
) != 0L) &&
395 ((dst
& 0x80000000L
) != 0L))
404 if (((src
& 0x80000000L
) != 0L)
405 && ((dst
& 0x80000000L
) != 0L))
407 if ((dst
& 0x80000000L
) != 0L
408 || (src
& 0x80000000L
) != 0L)
412 if (env
->cc_op
== CC_OP_SUB
413 || env
->cc_op
== CC_OP_CMP
) {
416 evaluate_flags_writeback(flags
);
419 void helper_evaluate_flags_move_4 (void)
424 res
= env
->cc_result
;
426 if ((int32_t)res
< 0)
431 evaluate_flags_writeback(flags
);
433 void helper_evaluate_flags_move_2 (void)
440 res
= env
->cc_result
;
442 if ((int16_t)res
< 0L)
447 evaluate_flags_writeback(flags
);
450 /* TODO: This is expensive. We could split things up and only evaluate part of
451 CCR on a need to know basis. For now, we simply re-evaluate everything. */
452 void helper_evaluate_flags (void)
461 res
= env
->cc_result
;
463 if (env
->cc_op
== CC_OP_SUB
|| env
->cc_op
== CC_OP_CMP
)
466 /* Now, evaluate the flags. This stuff is based on
467 Per Zander's CRISv10 simulator. */
468 switch (env
->cc_size
)
471 if ((res
& 0x80L
) != 0L)
474 if (((src
& 0x80L
) == 0L)
475 && ((dst
& 0x80L
) == 0L))
479 else if (((src
& 0x80L
) != 0L)
480 && ((dst
& 0x80L
) != 0L))
487 if ((res
& 0xFFL
) == 0L)
491 if (((src
& 0x80L
) != 0L)
492 && ((dst
& 0x80L
) != 0L))
496 if ((dst
& 0x80L
) != 0L
497 || (src
& 0x80L
) != 0L)
504 if ((res
& 0x8000L
) != 0L)
507 if (((src
& 0x8000L
) == 0L)
508 && ((dst
& 0x8000L
) == 0L))
512 else if (((src
& 0x8000L
) != 0L)
513 && ((dst
& 0x8000L
) != 0L))
520 if ((res
& 0xFFFFL
) == 0L)
524 if (((src
& 0x8000L
) != 0L)
525 && ((dst
& 0x8000L
) != 0L))
529 if ((dst
& 0x8000L
) != 0L
530 || (src
& 0x8000L
) != 0L)
537 if ((res
& 0x80000000L
) != 0L)
540 if (((src
& 0x80000000L
) == 0L)
541 && ((dst
& 0x80000000L
) == 0L))
545 else if (((src
& 0x80000000L
) != 0L) &&
546 ((dst
& 0x80000000L
) != 0L))
555 if (((src
& 0x80000000L
) != 0L)
556 && ((dst
& 0x80000000L
) != 0L))
558 if ((dst
& 0x80000000L
) != 0L
559 || (src
& 0x80000000L
) != 0L)
567 if (env
->cc_op
== CC_OP_SUB
568 || env
->cc_op
== CC_OP_CMP
) {
571 evaluate_flags_writeback(flags
);
574 void helper_top_evaluate_flags(void)
579 helper_evaluate_flags_mcp();
582 helper_evaluate_flags_muls();
585 helper_evaluate_flags_mulu();
594 switch (env
->cc_size
)
597 helper_evaluate_flags_move_4();
600 helper_evaluate_flags_move_2();
603 helper_evaluate_flags();
612 switch (env
->cc_size
)
615 helper_evaluate_flags_alu_4();
618 helper_evaluate_flags();