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)
248 unsigned int x, z, mask;
250 /* Extended arithmetics, leave the z flag alone. */
252 mask = env->cc_mask | X_FLAG;
259 /* all insn clear the x-flag except setf or clrf. */
260 env->pregs[PR_CCS] &= ~mask;
261 env->pregs[PR_CCS] |= flags;
264 void helper_evaluate_flags_muls(void)
276 res = env->cc_result;
278 dneg = ((int32_t)res) < 0;
280 mof = env->pregs[PR_MOF];
288 if ((dneg && mof != -1)
289 || (!dneg && mof != 0))
291 evaluate_flags_writeback(flags);
294 void helper_evaluate_flags_mulu(void)
305 res = env->cc_result;
307 mof = env->pregs[PR_MOF];
318 evaluate_flags_writeback(flags);
321 void helper_evaluate_flags_mcp(void)
328 src = env->cc_src & 0x80000000;
329 dst = env->cc_dest & 0x80000000;
330 res = env->cc_result;
332 if ((res & 0x80000000L) != 0L)
350 evaluate_flags_writeback(flags);
353 void helper_evaluate_flags_alu_4(void)
360 src = env->cc_src & 0x80000000;
361 dst = env->cc_dest & 0x80000000;
362 res = env->cc_result;
364 if ((res & 0x80000000L) != 0L)
382 evaluate_flags_writeback(flags);
385 void helper_evaluate_flags_sub_4(void)
392 src = (~env->cc_src) & 0x80000000;
393 dst = env->cc_dest & 0x80000000;
394 res = env->cc_result;
396 if ((res & 0x80000000L) != 0L)
415 evaluate_flags_writeback(flags);
418 void helper_evaluate_flags_move_4 (void)
423 res = env->cc_result;
425 if ((int32_t)res < 0)
430 evaluate_flags_writeback(flags);
432 void helper_evaluate_flags_move_2 (void)
439 res = env->cc_result;
441 if ((int16_t)res < 0L)
446 evaluate_flags_writeback(flags);
449 /* TODO: This is expensive. We could split things up and only evaluate part of
450 CCR on a need to know basis. For now, we simply re-evaluate everything. */
451 void helper_evaluate_flags (void)
460 res = env->cc_result;
462 if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
465 /* Now, evaluate the flags. This stuff is based on
466 Per Zander's CRISv10 simulator. */
467 switch (env->cc_size)
470 if ((res & 0x80L) != 0L)
473 if (((src & 0x80L) == 0L)
474 && ((dst & 0x80L) == 0L))
478 else if (((src & 0x80L) != 0L)
479 && ((dst & 0x80L) != 0L))
486 if ((res & 0xFFL) == 0L)
490 if (((src & 0x80L) != 0L)
491 && ((dst & 0x80L) != 0L))
495 if ((dst & 0x80L) != 0L
496 || (src & 0x80L) != 0L)
503 if ((res & 0x8000L) != 0L)
506 if (((src & 0x8000L) == 0L)
507 && ((dst & 0x8000L) == 0L))
511 else if (((src & 0x8000L) != 0L)
512 && ((dst & 0x8000L) != 0L))
519 if ((res & 0xFFFFL) == 0L)
523 if (((src & 0x8000L) != 0L)
524 && ((dst & 0x8000L) != 0L))
528 if ((dst & 0x8000L) != 0L
529 || (src & 0x8000L) != 0L)
536 if ((res & 0x80000000L) != 0L)
539 if (((src & 0x80000000L) == 0L)
540 && ((dst & 0x80000000L) == 0L))
544 else if (((src & 0x80000000L) != 0L) &&
545 ((dst & 0x80000000L) != 0L))
554 if (((src & 0x80000000L) != 0L)
555 && ((dst & 0x80000000L) != 0L))
557 if ((dst & 0x80000000L) != 0L
558 || (src & 0x80000000L) != 0L)
566 if (env->cc_op == CC_OP_SUB
567 || env->cc_op == CC_OP_CMP) {
570 evaluate_flags_writeback(flags);
573 void helper_top_evaluate_flags(void)
578 helper_evaluate_flags_mcp();
581 helper_evaluate_flags_muls();
584 helper_evaluate_flags_mulu();
593 switch (env->cc_size)
596 helper_evaluate_flags_move_4();
599 helper_evaluate_flags_move_2();
602 helper_evaluate_flags();
611 if (env->cc_size == 4)
612 helper_evaluate_flags_sub_4();
614 helper_evaluate_flags();
618 switch (env->cc_size)
621 helper_evaluate_flags_alu_4();
624 helper_evaluate_flags();