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, see <http://www.gnu.org/licenses/>.
21 #include "qemu/osdep.h"
24 #include "exec/helper-proto.h"
25 #include "qemu/host-utils.h"
26 #include "exec/cpu_ldst.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)
40 /* Try to fill the TLB and return an exception if error. If retaddr is
41 NULL, it means that the function was called in C code (i.e. not
42 from generated code or from helper.c) */
43 void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx,
46 CRISCPU *cpu = CRIS_CPU(cs);
47 CPUCRISState *env = &cpu->env;
50 D_LOG("%s pc=%x tpc=%x ra=%p\n", __func__,
51 env->pc, env->pregs[PR_EDA], (void *)retaddr);
52 ret = cris_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx);
55 /* now we have a real cpu fault */
56 if (cpu_restore_state(cs, retaddr)) {
57 /* Evaluate flags after retranslation. */
58 helper_top_evaluate_flags(env);
67 void helper_raise_exception(CPUCRISState *env, uint32_t index)
69 CPUState *cs = CPU(cris_env_get_cpu(env));
71 cs->exception_index = index;
75 void helper_tlb_flush_pid(CPUCRISState *env, uint32_t pid)
77 #if !defined(CONFIG_USER_ONLY)
79 if (pid != (env->pregs[PR_PID] & 0xff))
80 cris_mmu_flush_pid(env, env->pregs[PR_PID]);
84 void helper_spc_write(CPUCRISState *env, uint32_t new_spc)
86 #if !defined(CONFIG_USER_ONLY)
87 CRISCPU *cpu = cris_env_get_cpu(env);
88 CPUState *cs = CPU(cpu);
90 tlb_flush_page(cs, env->pregs[PR_SPC]);
91 tlb_flush_page(cs, new_spc);
95 /* Used by the tlb decoder. */
96 #define EXTRACT_FIELD(src, start, end) \
97 (((src) >> start) & ((1 << (end - start + 1)) - 1))
99 void helper_movl_sreg_reg(CPUCRISState *env, uint32_t sreg, uint32_t reg)
101 #if !defined(CONFIG_USER_ONLY)
102 CRISCPU *cpu = cris_env_get_cpu(env);
105 srs = env->pregs[PR_SRS];
107 env->sregs[srs][sreg] = env->regs[reg];
109 #if !defined(CONFIG_USER_ONLY)
110 if (srs == 1 || srs == 2) {
112 /* Writes to tlb-hi write to mm_cause as a side
114 env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg];
115 env->sregs[SFR_R_MM_CAUSE] = env->regs[reg];
117 else if (sreg == 5) {
124 idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
129 /* We've just made a write to tlb_lo. */
130 lo = env->sregs[SFR_RW_MM_TLB_LO];
131 /* Writes are done via r_mm_cause. */
132 hi = env->sregs[SFR_R_MM_CAUSE];
134 vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
136 vaddr <<= TARGET_PAGE_BITS;
137 tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
139 env->tlbsets[srs - 1][set][idx].lo = lo;
140 env->tlbsets[srs - 1][set][idx].hi = hi;
142 D_LOG("tlb flush vaddr=%x v=%d pc=%x\n",
143 vaddr, tlb_v, env->pc);
145 tlb_flush_page(CPU(cpu), vaddr);
152 void helper_movl_reg_sreg(CPUCRISState *env, uint32_t reg, uint32_t sreg)
155 env->pregs[PR_SRS] &= 3;
156 srs = env->pregs[PR_SRS];
158 #if !defined(CONFIG_USER_ONLY)
159 if (srs == 1 || srs == 2)
165 idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
170 /* Update the mirror regs. */
171 hi = env->tlbsets[srs - 1][set][idx].hi;
172 lo = env->tlbsets[srs - 1][set][idx].lo;
173 env->sregs[SFR_RW_MM_TLB_HI] = hi;
174 env->sregs[SFR_RW_MM_TLB_LO] = lo;
177 env->regs[reg] = env->sregs[srs][sreg];
180 static void cris_ccs_rshift(CPUCRISState *env)
184 /* Apply the ccs shift. */
185 ccs = env->pregs[PR_CCS];
186 ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10);
189 /* Enter user mode. */
190 env->ksp = env->regs[R_SP];
191 env->regs[R_SP] = env->pregs[PR_USP];
194 env->pregs[PR_CCS] = ccs;
197 void helper_rfe(CPUCRISState *env)
199 int rflag = env->pregs[PR_CCS] & R_FLAG;
201 D_LOG("rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
202 env->pregs[PR_ERP], env->pregs[PR_PID],
206 cris_ccs_rshift(env);
208 /* RFE sets the P_FLAG only if the R_FLAG is not set. */
210 env->pregs[PR_CCS] |= P_FLAG;
213 void helper_rfn(CPUCRISState *env)
215 int rflag = env->pregs[PR_CCS] & R_FLAG;
217 D_LOG("rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
218 env->pregs[PR_ERP], env->pregs[PR_PID],
222 cris_ccs_rshift(env);
224 /* Set the P_FLAG only if the R_FLAG is not set. */
226 env->pregs[PR_CCS] |= P_FLAG;
228 /* Always set the M flag. */
229 env->pregs[PR_CCS] |= M_FLAG_V32;
232 uint32_t helper_lz(uint32_t t0)
237 uint32_t helper_btst(CPUCRISState *env, uint32_t t0, uint32_t t1, uint32_t ccs)
239 /* FIXME: clean this up. */
242 The N flag is set according to the selected bit in the dest reg.
243 The Z flag is set if the selected bit and all bits to the right are
245 The X flag is cleared.
246 Other flags are left untouched.
247 The destination reg is not affected.*/
248 unsigned int fz, sbit, bset, mask, masked_t0;
251 bset = !!(t0 & (1 << sbit));
252 mask = sbit == 31 ? -1 : (1 << (sbit + 1)) - 1;
253 masked_t0 = t0 & mask;
254 fz = !(masked_t0 | bset);
256 /* Clear the X, N and Z flags. */
257 ccs = ccs & ~(X_FLAG | N_FLAG | Z_FLAG);
258 if (env->pregs[PR_VR] < 32)
259 ccs &= ~(V_FLAG | C_FLAG);
260 /* Set the N and Z flags accordingly. */
261 ccs |= (bset << 3) | (fz << 2);
265 static inline uint32_t evaluate_flags_writeback(CPUCRISState *env,
266 uint32_t flags, uint32_t ccs)
268 unsigned int x, z, mask;
270 /* Extended arithmetics, leave the z flag alone. */
272 mask = env->cc_mask | X_FLAG;
279 /* all insn clear the x-flag except setf or clrf. */
285 uint32_t helper_evaluate_flags_muls(CPUCRISState *env,
286 uint32_t ccs, uint32_t res, uint32_t mof)
292 dneg = ((int32_t)res) < 0;
301 if ((dneg && mof != -1)
302 || (!dneg && mof != 0))
304 return evaluate_flags_writeback(env, flags, ccs);
307 uint32_t helper_evaluate_flags_mulu(CPUCRISState *env,
308 uint32_t ccs, uint32_t res, uint32_t mof)
323 return evaluate_flags_writeback(env, flags, ccs);
326 uint32_t helper_evaluate_flags_mcp(CPUCRISState *env, uint32_t ccs,
327 uint32_t src, uint32_t dst, uint32_t res)
331 src = src & 0x80000000;
332 dst = dst & 0x80000000;
334 if ((res & 0x80000000L) != 0L)
352 return evaluate_flags_writeback(env, flags, ccs);
355 uint32_t helper_evaluate_flags_alu_4(CPUCRISState *env, uint32_t ccs,
356 uint32_t src, uint32_t dst, uint32_t res)
360 src = src & 0x80000000;
361 dst = dst & 0x80000000;
363 if ((res & 0x80000000L) != 0L)
381 return evaluate_flags_writeback(env, flags, ccs);
384 uint32_t helper_evaluate_flags_sub_4(CPUCRISState *env, uint32_t ccs,
385 uint32_t src, uint32_t dst, uint32_t res)
389 src = (~src) & 0x80000000;
390 dst = dst & 0x80000000;
392 if ((res & 0x80000000L) != 0L)
411 return evaluate_flags_writeback(env, flags, ccs);
414 uint32_t helper_evaluate_flags_move_4(CPUCRISState *env,
415 uint32_t ccs, uint32_t res)
419 if ((int32_t)res < 0)
424 return evaluate_flags_writeback(env, flags, ccs);
426 uint32_t helper_evaluate_flags_move_2(CPUCRISState *env,
427 uint32_t ccs, uint32_t res)
431 if ((int16_t)res < 0L)
436 return evaluate_flags_writeback(env, flags, ccs);
439 /* TODO: This is expensive. We could split things up and only evaluate part of
440 CCR on a need to know basis. For now, we simply re-evaluate everything. */
441 void helper_evaluate_flags(CPUCRISState *env)
443 uint32_t src, dst, res;
448 res = env->cc_result;
450 if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
453 /* Now, evaluate the flags. This stuff is based on
454 Per Zander's CRISv10 simulator. */
455 switch (env->cc_size)
458 if ((res & 0x80L) != 0L)
461 if (((src & 0x80L) == 0L)
462 && ((dst & 0x80L) == 0L))
466 else if (((src & 0x80L) != 0L)
467 && ((dst & 0x80L) != 0L))
474 if ((res & 0xFFL) == 0L)
478 if (((src & 0x80L) != 0L)
479 && ((dst & 0x80L) != 0L))
483 if ((dst & 0x80L) != 0L
484 || (src & 0x80L) != 0L)
491 if ((res & 0x8000L) != 0L)
494 if (((src & 0x8000L) == 0L)
495 && ((dst & 0x8000L) == 0L))
499 else if (((src & 0x8000L) != 0L)
500 && ((dst & 0x8000L) != 0L))
507 if ((res & 0xFFFFL) == 0L)
511 if (((src & 0x8000L) != 0L)
512 && ((dst & 0x8000L) != 0L))
516 if ((dst & 0x8000L) != 0L
517 || (src & 0x8000L) != 0L)
524 if ((res & 0x80000000L) != 0L)
527 if (((src & 0x80000000L) == 0L)
528 && ((dst & 0x80000000L) == 0L))
532 else if (((src & 0x80000000L) != 0L) &&
533 ((dst & 0x80000000L) != 0L))
542 if (((src & 0x80000000L) != 0L)
543 && ((dst & 0x80000000L) != 0L))
545 if ((dst & 0x80000000L) != 0L
546 || (src & 0x80000000L) != 0L)
554 if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
557 env->pregs[PR_CCS] = evaluate_flags_writeback(env, flags,
561 void helper_top_evaluate_flags(CPUCRISState *env)
566 env->pregs[PR_CCS] = helper_evaluate_flags_mcp(env,
567 env->pregs[PR_CCS], env->cc_src,
568 env->cc_dest, env->cc_result);
571 env->pregs[PR_CCS] = helper_evaluate_flags_muls(env,
572 env->pregs[PR_CCS], env->cc_result,
576 env->pregs[PR_CCS] = helper_evaluate_flags_mulu(env,
577 env->pregs[PR_CCS], env->cc_result,
587 switch (env->cc_size)
591 helper_evaluate_flags_move_4(env,
597 helper_evaluate_flags_move_2(env,
602 helper_evaluate_flags(env);
611 if (env->cc_size == 4)
613 helper_evaluate_flags_sub_4(env,
615 env->cc_src, env->cc_dest,
618 helper_evaluate_flags(env);
622 switch (env->cc_size)
626 helper_evaluate_flags_alu_4(env,
628 env->cc_src, env->cc_dest,
632 helper_evaluate_flags(env);