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
25 #include "host-utils.h"
27 //#define CRIS_OP_HELPER_DEBUG
30 #ifdef CRIS_OP_HELPER_DEBUG
32 #define D_LOG(...) qemu_log(__VA__ARGS__)
35 #define D_LOG(...) do { } while (0)
38 #if !defined(CONFIG_USER_ONLY)
40 #define MMUSUFFIX _mmu
43 #include "softmmu_template.h"
46 #include "softmmu_template.h"
49 #include "softmmu_template.h"
52 #include "softmmu_template.h"
54 /* Try to fill the TLB and return an exception if error. If retaddr is
55 NULL, it means that the function was called in C code (i.e. not
56 from generated code or from helper.c) */
57 /* XXX: fix it to restore all registers */
58 void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
65 /* XXX: hack to restore env in all cases, even if not called from
70 D_LOG("%s pc=%x tpc=%x ra=%x\n", __func__,
71 env->pc, env->debug1, retaddr);
72 ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
75 /* now we have a real cpu fault */
76 pc = (unsigned long)retaddr;
79 /* the PC is inside the translated code. It means that we have
80 a virtual CPU fault */
81 cpu_restore_state(tb, env, pc, NULL);
83 /* Evaluate flags after retranslation. */
84 helper_top_evaluate_flags();
94 void helper_raise_exception(uint32_t index)
96 env->exception_index = index;
100 void helper_tlb_flush_pid(uint32_t pid)
102 #if !defined(CONFIG_USER_ONLY)
104 if (pid != (env->pregs[PR_PID] & 0xff))
105 cris_mmu_flush_pid(env, env->pregs[PR_PID]);
109 void helper_spc_write(uint32_t new_spc)
111 #if !defined(CONFIG_USER_ONLY)
112 tlb_flush_page(env, env->pregs[PR_SPC]);
113 tlb_flush_page(env, new_spc);
117 void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
119 qemu_log("%s: a0=%x a1=%x\n", __func__, a0, a1);
122 /* Used by the tlb decoder. */
123 #define EXTRACT_FIELD(src, start, end) \
124 (((src) >> start) & ((1 << (end - start + 1)) - 1))
126 void helper_movl_sreg_reg (uint32_t sreg, uint32_t reg)
129 srs = env->pregs[PR_SRS];
131 env->sregs[srs][sreg] = env->regs[reg];
133 #if !defined(CONFIG_USER_ONLY)
134 if (srs == 1 || srs == 2) {
136 /* Writes to tlb-hi write to mm_cause as a side
138 env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg];
139 env->sregs[SFR_R_MM_CAUSE] = env->regs[reg];
141 else if (sreg == 5) {
148 idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
153 /* We've just made a write to tlb_lo. */
154 lo = env->sregs[SFR_RW_MM_TLB_LO];
155 /* Writes are done via r_mm_cause. */
156 hi = env->sregs[SFR_R_MM_CAUSE];
158 vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
160 vaddr <<= TARGET_PAGE_BITS;
161 tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
163 env->tlbsets[srs - 1][set][idx].lo = lo;
164 env->tlbsets[srs - 1][set][idx].hi = hi;
166 D_LOG("tlb flush vaddr=%x v=%d pc=%x\n",
167 vaddr, tlb_v, env->pc);
168 tlb_flush_page(env, vaddr);
174 void helper_movl_reg_sreg (uint32_t reg, uint32_t sreg)
177 env->pregs[PR_SRS] &= 3;
178 srs = env->pregs[PR_SRS];
180 #if !defined(CONFIG_USER_ONLY)
181 if (srs == 1 || srs == 2)
187 idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
192 /* Update the mirror regs. */
193 hi = env->tlbsets[srs - 1][set][idx].hi;
194 lo = env->tlbsets[srs - 1][set][idx].lo;
195 env->sregs[SFR_RW_MM_TLB_HI] = hi;
196 env->sregs[SFR_RW_MM_TLB_LO] = lo;
199 env->regs[reg] = env->sregs[srs][sreg];
202 static void cris_ccs_rshift(CPUState *env)
206 /* Apply the ccs shift. */
207 ccs = env->pregs[PR_CCS];
208 ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10);
211 /* Enter user mode. */
212 env->ksp = env->regs[R_SP];
213 env->regs[R_SP] = env->pregs[PR_USP];
216 env->pregs[PR_CCS] = ccs;
219 void helper_rfe(void)
221 int rflag = env->pregs[PR_CCS] & R_FLAG;
223 D_LOG("rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
224 env->pregs[PR_ERP], env->pregs[PR_PID],
228 cris_ccs_rshift(env);
230 /* RFE sets the P_FLAG only if the R_FLAG is not set. */
232 env->pregs[PR_CCS] |= P_FLAG;
235 void helper_rfn(void)
237 int rflag = env->pregs[PR_CCS] & R_FLAG;
239 D_LOG("rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
240 env->pregs[PR_ERP], env->pregs[PR_PID],
244 cris_ccs_rshift(env);
246 /* Set the P_FLAG only if the R_FLAG is not set. */
248 env->pregs[PR_CCS] |= P_FLAG;
250 /* Always set the M flag. */
251 env->pregs[PR_CCS] |= M_FLAG;
254 uint32_t helper_lz(uint32_t t0)
259 uint32_t helper_btst(uint32_t t0, uint32_t t1, uint32_t ccs)
261 /* FIXME: clean this up. */
264 The N flag is set according to the selected bit in the dest reg.
265 The Z flag is set if the selected bit and all bits to the right are
267 The X flag is cleared.
268 Other flags are left untouched.
269 The destination reg is not affected.*/
270 unsigned int fz, sbit, bset, mask, masked_t0;
273 bset = !!(t0 & (1 << sbit));
274 mask = sbit == 31 ? -1 : (1 << (sbit + 1)) - 1;
275 masked_t0 = t0 & mask;
276 fz = !(masked_t0 | bset);
278 /* Clear the X, N and Z flags. */
279 ccs = ccs & ~(X_FLAG | N_FLAG | Z_FLAG);
280 /* Set the N and Z flags accordingly. */
281 ccs |= (bset << 3) | (fz << 2);
285 static inline uint32_t evaluate_flags_writeback(uint32_t flags, uint32_t ccs)
287 unsigned int x, z, mask;
289 /* Extended arithmetics, leave the z flag alone. */
291 mask = env->cc_mask | X_FLAG;
298 /* all insn clear the x-flag except setf or clrf. */
304 uint32_t helper_evaluate_flags_muls(uint32_t ccs, uint32_t res, uint32_t mof)
310 dneg = ((int32_t)res) < 0;
319 if ((dneg && mof != -1)
320 || (!dneg && mof != 0))
322 return evaluate_flags_writeback(flags, ccs);
325 uint32_t helper_evaluate_flags_mulu(uint32_t ccs, uint32_t res, uint32_t mof)
340 return evaluate_flags_writeback(flags, ccs);
343 uint32_t helper_evaluate_flags_mcp(uint32_t ccs,
344 uint32_t src, uint32_t dst, uint32_t res)
348 src = src & 0x80000000;
349 dst = dst & 0x80000000;
351 if ((res & 0x80000000L) != 0L)
369 return evaluate_flags_writeback(flags, ccs);
372 uint32_t helper_evaluate_flags_alu_4(uint32_t ccs,
373 uint32_t src, uint32_t dst, uint32_t res)
377 src = src & 0x80000000;
378 dst = dst & 0x80000000;
380 if ((res & 0x80000000L) != 0L)
398 return evaluate_flags_writeback(flags, ccs);
401 uint32_t helper_evaluate_flags_sub_4(uint32_t ccs,
402 uint32_t src, uint32_t dst, uint32_t res)
406 src = (~src) & 0x80000000;
407 dst = dst & 0x80000000;
409 if ((res & 0x80000000L) != 0L)
428 return evaluate_flags_writeback(flags, ccs);
431 uint32_t helper_evaluate_flags_move_4(uint32_t ccs, uint32_t res)
435 if ((int32_t)res < 0)
440 return evaluate_flags_writeback(flags, ccs);
442 uint32_t helper_evaluate_flags_move_2(uint32_t ccs, uint32_t res)
446 if ((int16_t)res < 0L)
451 return evaluate_flags_writeback(flags, ccs);
454 /* TODO: This is expensive. We could split things up and only evaluate part of
455 CCR on a need to know basis. For now, we simply re-evaluate everything. */
456 void helper_evaluate_flags(void)
458 uint32_t src, dst, res;
463 res = env->cc_result;
465 if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
468 /* Now, evaluate the flags. This stuff is based on
469 Per Zander's CRISv10 simulator. */
470 switch (env->cc_size)
473 if ((res & 0x80L) != 0L)
476 if (((src & 0x80L) == 0L)
477 && ((dst & 0x80L) == 0L))
481 else if (((src & 0x80L) != 0L)
482 && ((dst & 0x80L) != 0L))
489 if ((res & 0xFFL) == 0L)
493 if (((src & 0x80L) != 0L)
494 && ((dst & 0x80L) != 0L))
498 if ((dst & 0x80L) != 0L
499 || (src & 0x80L) != 0L)
506 if ((res & 0x8000L) != 0L)
509 if (((src & 0x8000L) == 0L)
510 && ((dst & 0x8000L) == 0L))
514 else if (((src & 0x8000L) != 0L)
515 && ((dst & 0x8000L) != 0L))
522 if ((res & 0xFFFFL) == 0L)
526 if (((src & 0x8000L) != 0L)
527 && ((dst & 0x8000L) != 0L))
531 if ((dst & 0x8000L) != 0L
532 || (src & 0x8000L) != 0L)
539 if ((res & 0x80000000L) != 0L)
542 if (((src & 0x80000000L) == 0L)
543 && ((dst & 0x80000000L) == 0L))
547 else if (((src & 0x80000000L) != 0L) &&
548 ((dst & 0x80000000L) != 0L))
557 if (((src & 0x80000000L) != 0L)
558 && ((dst & 0x80000000L) != 0L))
560 if ((dst & 0x80000000L) != 0L
561 || (src & 0x80000000L) != 0L)
569 if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
572 env->pregs[PR_CCS] = evaluate_flags_writeback(flags, env->pregs[PR_CCS]);
575 void helper_top_evaluate_flags(void)
580 env->pregs[PR_CCS] = helper_evaluate_flags_mcp(
581 env->pregs[PR_CCS], env->cc_src,
582 env->cc_dest, env->cc_result);
585 env->pregs[PR_CCS] = helper_evaluate_flags_muls(
586 env->pregs[PR_CCS], env->cc_result,
590 env->pregs[PR_CCS] = helper_evaluate_flags_mulu(
591 env->pregs[PR_CCS], env->cc_result,
601 switch (env->cc_size)
605 helper_evaluate_flags_move_4(
611 helper_evaluate_flags_move_2(
616 helper_evaluate_flags();
625 if (env->cc_size == 4)
627 helper_evaluate_flags_sub_4(
629 env->cc_src, env->cc_dest,
632 helper_evaluate_flags();
636 switch (env->cc_size)
640 helper_evaluate_flags_alu_4(
642 env->cc_src, env->cc_dest,
646 helper_evaluate_flags();