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
26 #include "host-utils.h"
28 //#define CRIS_OP_HELPER_DEBUG
31 #ifdef CRIS_OP_HELPER_DEBUG
33 #define D_LOG(...) qemu_log(__VA__ARGS__)
36 #define D_LOG(...) do { } while (0)
39 #if !defined(CONFIG_USER_ONLY)
41 #define MMUSUFFIX _mmu
44 #include "softmmu_template.h"
47 #include "softmmu_template.h"
50 #include "softmmu_template.h"
53 #include "softmmu_template.h"
55 /* Try to fill the TLB and return an exception if error. If retaddr is
56 NULL, it means that the function was called in C code (i.e. not
57 from generated code or from helper.c) */
58 /* XXX: fix it to restore all registers */
59 void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
66 /* XXX: hack to restore env in all cases, even if not called from
71 D_LOG("%s pc=%x tpc=%x ra=%x\n", __func__,
72 env->pc, env->debug1, retaddr);
73 ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
76 /* now we have a real cpu fault */
77 pc = (unsigned long)retaddr;
80 /* the PC is inside the translated code. It means that we have
81 a virtual CPU fault */
82 cpu_restore_state(tb, env, pc, NULL);
84 /* Evaluate flags after retranslation. */
85 helper_top_evaluate_flags();
95 void helper_raise_exception(uint32_t index)
97 env->exception_index = index;
101 void helper_tlb_flush_pid(uint32_t pid)
103 #if !defined(CONFIG_USER_ONLY)
105 if (pid != (env->pregs[PR_PID] & 0xff))
106 cris_mmu_flush_pid(env, env->pregs[PR_PID]);
110 void helper_spc_write(uint32_t new_spc)
112 #if !defined(CONFIG_USER_ONLY)
113 tlb_flush_page(env, env->pregs[PR_SPC]);
114 tlb_flush_page(env, new_spc);
118 void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
120 qemu_log("%s: a0=%x a1=%x\n", __func__, a0, a1);
123 /* Used by the tlb decoder. */
124 #define EXTRACT_FIELD(src, start, end) \
125 (((src) >> start) & ((1 << (end - start + 1)) - 1))
127 void helper_movl_sreg_reg (uint32_t sreg, uint32_t reg)
130 srs = env->pregs[PR_SRS];
132 env->sregs[srs][sreg] = env->regs[reg];
134 #if !defined(CONFIG_USER_ONLY)
135 if (srs == 1 || srs == 2) {
137 /* Writes to tlb-hi write to mm_cause as a side
139 env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg];
140 env->sregs[SFR_R_MM_CAUSE] = env->regs[reg];
142 else if (sreg == 5) {
149 idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
154 /* We've just made a write to tlb_lo. */
155 lo = env->sregs[SFR_RW_MM_TLB_LO];
156 /* Writes are done via r_mm_cause. */
157 hi = env->sregs[SFR_R_MM_CAUSE];
159 vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
161 vaddr <<= TARGET_PAGE_BITS;
162 tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
164 env->tlbsets[srs - 1][set][idx].lo = lo;
165 env->tlbsets[srs - 1][set][idx].hi = hi;
167 D_LOG("tlb flush vaddr=%x v=%d pc=%x\n",
168 vaddr, tlb_v, env->pc);
169 tlb_flush_page(env, vaddr);
175 void helper_movl_reg_sreg (uint32_t reg, uint32_t sreg)
178 env->pregs[PR_SRS] &= 3;
179 srs = env->pregs[PR_SRS];
181 #if !defined(CONFIG_USER_ONLY)
182 if (srs == 1 || srs == 2)
188 idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
193 /* Update the mirror regs. */
194 hi = env->tlbsets[srs - 1][set][idx].hi;
195 lo = env->tlbsets[srs - 1][set][idx].lo;
196 env->sregs[SFR_RW_MM_TLB_HI] = hi;
197 env->sregs[SFR_RW_MM_TLB_LO] = lo;
200 env->regs[reg] = env->sregs[srs][sreg];
203 static void cris_ccs_rshift(CPUState *env)
207 /* Apply the ccs shift. */
208 ccs = env->pregs[PR_CCS];
209 ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10);
212 /* Enter user mode. */
213 env->ksp = env->regs[R_SP];
214 env->regs[R_SP] = env->pregs[PR_USP];
217 env->pregs[PR_CCS] = ccs;
220 void helper_rfe(void)
222 int rflag = env->pregs[PR_CCS] & R_FLAG;
224 D_LOG("rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
225 env->pregs[PR_ERP], env->pregs[PR_PID],
229 cris_ccs_rshift(env);
231 /* RFE sets the P_FLAG only if the R_FLAG is not set. */
233 env->pregs[PR_CCS] |= P_FLAG;
236 void helper_rfn(void)
238 int rflag = env->pregs[PR_CCS] & R_FLAG;
240 D_LOG("rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
241 env->pregs[PR_ERP], env->pregs[PR_PID],
245 cris_ccs_rshift(env);
247 /* Set the P_FLAG only if the R_FLAG is not set. */
249 env->pregs[PR_CCS] |= P_FLAG;
251 /* Always set the M flag. */
252 env->pregs[PR_CCS] |= M_FLAG;
255 uint32_t helper_lz(uint32_t t0)
260 uint32_t helper_btst(uint32_t t0, uint32_t t1, uint32_t ccs)
262 /* FIXME: clean this up. */
265 The N flag is set according to the selected bit in the dest reg.
266 The Z flag is set if the selected bit and all bits to the right are
268 The X flag is cleared.
269 Other flags are left untouched.
270 The destination reg is not affected.*/
271 unsigned int fz, sbit, bset, mask, masked_t0;
274 bset = !!(t0 & (1 << sbit));
275 mask = sbit == 31 ? -1 : (1 << (sbit + 1)) - 1;
276 masked_t0 = t0 & mask;
277 fz = !(masked_t0 | bset);
279 /* Clear the X, N and Z flags. */
280 ccs = ccs & ~(X_FLAG | N_FLAG | Z_FLAG);
281 /* Set the N and Z flags accordingly. */
282 ccs |= (bset << 3) | (fz << 2);
286 static inline uint32_t evaluate_flags_writeback(uint32_t flags, uint32_t ccs)
288 unsigned int x, z, mask;
290 /* Extended arithmetics, leave the z flag alone. */
292 mask = env->cc_mask | X_FLAG;
299 /* all insn clear the x-flag except setf or clrf. */
305 uint32_t helper_evaluate_flags_muls(uint32_t ccs, uint32_t res, uint32_t mof)
311 dneg = ((int32_t)res) < 0;
320 if ((dneg && mof != -1)
321 || (!dneg && mof != 0))
323 return evaluate_flags_writeback(flags, ccs);
326 uint32_t helper_evaluate_flags_mulu(uint32_t ccs, uint32_t res, uint32_t mof)
341 return evaluate_flags_writeback(flags, ccs);
344 uint32_t helper_evaluate_flags_mcp(uint32_t ccs,
345 uint32_t src, uint32_t dst, uint32_t res)
349 src = src & 0x80000000;
350 dst = dst & 0x80000000;
352 if ((res & 0x80000000L) != 0L)
370 return evaluate_flags_writeback(flags, ccs);
373 uint32_t helper_evaluate_flags_alu_4(uint32_t ccs,
374 uint32_t src, uint32_t dst, uint32_t res)
378 src = src & 0x80000000;
379 dst = dst & 0x80000000;
381 if ((res & 0x80000000L) != 0L)
399 return evaluate_flags_writeback(flags, ccs);
402 uint32_t helper_evaluate_flags_sub_4(uint32_t ccs,
403 uint32_t src, uint32_t dst, uint32_t res)
407 src = (~src) & 0x80000000;
408 dst = dst & 0x80000000;
410 if ((res & 0x80000000L) != 0L)
429 return evaluate_flags_writeback(flags, ccs);
432 uint32_t helper_evaluate_flags_move_4(uint32_t ccs, uint32_t res)
436 if ((int32_t)res < 0)
441 return evaluate_flags_writeback(flags, ccs);
443 uint32_t helper_evaluate_flags_move_2(uint32_t ccs, uint32_t res)
447 if ((int16_t)res < 0L)
452 return evaluate_flags_writeback(flags, ccs);
455 /* TODO: This is expensive. We could split things up and only evaluate part of
456 CCR on a need to know basis. For now, we simply re-evaluate everything. */
457 void helper_evaluate_flags(void)
459 uint32_t src, dst, res;
464 res = env->cc_result;
466 if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
469 /* Now, evaluate the flags. This stuff is based on
470 Per Zander's CRISv10 simulator. */
471 switch (env->cc_size)
474 if ((res & 0x80L) != 0L)
477 if (((src & 0x80L) == 0L)
478 && ((dst & 0x80L) == 0L))
482 else if (((src & 0x80L) != 0L)
483 && ((dst & 0x80L) != 0L))
490 if ((res & 0xFFL) == 0L)
494 if (((src & 0x80L) != 0L)
495 && ((dst & 0x80L) != 0L))
499 if ((dst & 0x80L) != 0L
500 || (src & 0x80L) != 0L)
507 if ((res & 0x8000L) != 0L)
510 if (((src & 0x8000L) == 0L)
511 && ((dst & 0x8000L) == 0L))
515 else if (((src & 0x8000L) != 0L)
516 && ((dst & 0x8000L) != 0L))
523 if ((res & 0xFFFFL) == 0L)
527 if (((src & 0x8000L) != 0L)
528 && ((dst & 0x8000L) != 0L))
532 if ((dst & 0x8000L) != 0L
533 || (src & 0x8000L) != 0L)
540 if ((res & 0x80000000L) != 0L)
543 if (((src & 0x80000000L) == 0L)
544 && ((dst & 0x80000000L) == 0L))
548 else if (((src & 0x80000000L) != 0L) &&
549 ((dst & 0x80000000L) != 0L))
558 if (((src & 0x80000000L) != 0L)
559 && ((dst & 0x80000000L) != 0L))
561 if ((dst & 0x80000000L) != 0L
562 || (src & 0x80000000L) != 0L)
570 if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
573 env->pregs[PR_CCS] = evaluate_flags_writeback(flags, env->pregs[PR_CCS]);
576 void helper_top_evaluate_flags(void)
581 env->pregs[PR_CCS] = helper_evaluate_flags_mcp(
582 env->pregs[PR_CCS], env->cc_src,
583 env->cc_dest, env->cc_result);
586 env->pregs[PR_CCS] = helper_evaluate_flags_muls(
587 env->pregs[PR_CCS], env->cc_result,
591 env->pregs[PR_CCS] = helper_evaluate_flags_mulu(
592 env->pregs[PR_CCS], env->cc_result,
602 switch (env->cc_size)
606 helper_evaluate_flags_move_4(
612 helper_evaluate_flags_move_2(
617 helper_evaluate_flags();
626 if (env->cc_size == 4)
628 helper_evaluate_flags_sub_4(
630 env->cc_src, env->cc_dest,
633 helper_evaluate_flags();
637 switch (env->cc_size)
641 helper_evaluate_flags_alu_4(
643 env->cc_src, env->cc_dest,
647 helper_evaluate_flags();