/* * CRIS helper routines * * Copyright (c) 2007 AXIS Communications * Written by Edgar E. Iglesias * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. */ #include "cpu.h" #include "mmu.h" #include "exec/helper-proto.h" #include "qemu/host-utils.h" #include "exec/cpu_ldst.h" //#define CRIS_OP_HELPER_DEBUG #ifdef CRIS_OP_HELPER_DEBUG #define D(x) x #define D_LOG(...) qemu_log(__VA_ARGS__) #else #define D(x) #define D_LOG(...) do { } while (0) #endif #if !defined(CONFIG_USER_ONLY) /* Try to fill the TLB and return an exception if error. If retaddr is NULL, it means that the function was called in C code (i.e. not from generated code or from helper.c) */ void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx, uintptr_t retaddr) { CRISCPU *cpu = CRIS_CPU(cs); CPUCRISState *env = &cpu->env; int ret; D_LOG("%s pc=%x tpc=%x ra=%p\n", __func__, env->pc, env->pregs[PR_EDA], (void *)retaddr); ret = cris_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx); if (unlikely(ret)) { if (retaddr) { /* now we have a real cpu fault */ if (cpu_restore_state(cs, retaddr)) { /* Evaluate flags after retranslation. */ helper_top_evaluate_flags(env); } } cpu_loop_exit(cs); } } #endif void helper_raise_exception(CPUCRISState *env, uint32_t index) { CPUState *cs = CPU(cris_env_get_cpu(env)); cs->exception_index = index; cpu_loop_exit(cs); } void helper_tlb_flush_pid(CPUCRISState *env, uint32_t pid) { #if !defined(CONFIG_USER_ONLY) pid &= 0xff; if (pid != (env->pregs[PR_PID] & 0xff)) cris_mmu_flush_pid(env, env->pregs[PR_PID]); #endif } void helper_spc_write(CPUCRISState *env, uint32_t new_spc) { #if !defined(CONFIG_USER_ONLY) CRISCPU *cpu = cris_env_get_cpu(env); CPUState *cs = CPU(cpu); tlb_flush_page(cs, env->pregs[PR_SPC]); tlb_flush_page(cs, new_spc); #endif } void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2) { qemu_log("%s: a0=%x a1=%x\n", __func__, a0, a1); } /* Used by the tlb decoder. */ #define EXTRACT_FIELD(src, start, end) \ (((src) >> start) & ((1 << (end - start + 1)) - 1)) void helper_movl_sreg_reg(CPUCRISState *env, uint32_t sreg, uint32_t reg) { #if !defined(CONFIG_USER_ONLY) CRISCPU *cpu = cris_env_get_cpu(env); #endif uint32_t srs; srs = env->pregs[PR_SRS]; srs &= 3; env->sregs[srs][sreg] = env->regs[reg]; #if !defined(CONFIG_USER_ONLY) if (srs == 1 || srs == 2) { if (sreg == 6) { /* Writes to tlb-hi write to mm_cause as a side effect. */ env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg]; env->sregs[SFR_R_MM_CAUSE] = env->regs[reg]; } else if (sreg == 5) { uint32_t set; uint32_t idx; uint32_t lo, hi; uint32_t vaddr; int tlb_v; idx = set = env->sregs[SFR_RW_MM_TLB_SEL]; set >>= 4; set &= 3; idx &= 15; /* We've just made a write to tlb_lo. */ lo = env->sregs[SFR_RW_MM_TLB_LO]; /* Writes are done via r_mm_cause. */ hi = env->sregs[SFR_R_MM_CAUSE]; vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi, 13, 31); vaddr <<= TARGET_PAGE_BITS; tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo, 3, 3); env->tlbsets[srs - 1][set][idx].lo = lo; env->tlbsets[srs - 1][set][idx].hi = hi; D_LOG("tlb flush vaddr=%x v=%d pc=%x\n", vaddr, tlb_v, env->pc); if (tlb_v) { tlb_flush_page(CPU(cpu), vaddr); } } } #endif } void helper_movl_reg_sreg(CPUCRISState *env, uint32_t reg, uint32_t sreg) { uint32_t srs; env->pregs[PR_SRS] &= 3; srs = env->pregs[PR_SRS]; #if !defined(CONFIG_USER_ONLY) if (srs == 1 || srs == 2) { uint32_t set; uint32_t idx; uint32_t lo, hi; idx = set = env->sregs[SFR_RW_MM_TLB_SEL]; set >>= 4; set &= 3; idx &= 15; /* Update the mirror regs. */ hi = env->tlbsets[srs - 1][set][idx].hi; lo = env->tlbsets[srs - 1][set][idx].lo; env->sregs[SFR_RW_MM_TLB_HI] = hi; env->sregs[SFR_RW_MM_TLB_LO] = lo; } #endif env->regs[reg] = env->sregs[srs][sreg]; } static void cris_ccs_rshift(CPUCRISState *env) { uint32_t ccs; /* Apply the ccs shift. */ ccs = env->pregs[PR_CCS]; ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10); if (ccs & U_FLAG) { /* Enter user mode. */ env->ksp = env->regs[R_SP]; env->regs[R_SP] = env->pregs[PR_USP]; } env->pregs[PR_CCS] = ccs; } void helper_rfe(CPUCRISState *env) { int rflag = env->pregs[PR_CCS] & R_FLAG; D_LOG("rfe: erp=%x pid=%x ccs=%x btarget=%x\n", env->pregs[PR_ERP], env->pregs[PR_PID], env->pregs[PR_CCS], env->btarget); cris_ccs_rshift(env); /* RFE sets the P_FLAG only if the R_FLAG is not set. */ if (!rflag) env->pregs[PR_CCS] |= P_FLAG; } void helper_rfn(CPUCRISState *env) { int rflag = env->pregs[PR_CCS] & R_FLAG; D_LOG("rfn: erp=%x pid=%x ccs=%x btarget=%x\n", env->pregs[PR_ERP], env->pregs[PR_PID], env->pregs[PR_CCS], env->btarget); cris_ccs_rshift(env); /* Set the P_FLAG only if the R_FLAG is not set. */ if (!rflag) env->pregs[PR_CCS] |= P_FLAG; /* Always set the M flag. */ env->pregs[PR_CCS] |= M_FLAG_V32; } uint32_t helper_lz(uint32_t t0) { return clz32(t0); } uint32_t helper_btst(CPUCRISState *env, uint32_t t0, uint32_t t1, uint32_t ccs) { /* FIXME: clean this up. */ /* des ref: The N flag is set according to the selected bit in the dest reg. The Z flag is set if the selected bit and all bits to the right are zero. The X flag is cleared. Other flags are left untouched. The destination reg is not affected.*/ unsigned int fz, sbit, bset, mask, masked_t0; sbit = t1 & 31; bset = !!(t0 & (1 << sbit)); mask = sbit == 31 ? -1 : (1 << (sbit + 1)) - 1; masked_t0 = t0 & mask; fz = !(masked_t0 | bset); /* Clear the X, N and Z flags. */ ccs = ccs & ~(X_FLAG | N_FLAG | Z_FLAG); if (env->pregs[PR_VR] < 32) ccs &= ~(V_FLAG | C_FLAG); /* Set the N and Z flags accordingly. */ ccs |= (bset << 3) | (fz << 2); return ccs; } static inline uint32_t evaluate_flags_writeback(CPUCRISState *env, uint32_t flags, uint32_t ccs) { unsigned int x, z, mask; /* Extended arithmetics, leave the z flag alone. */ x = env->cc_x; mask = env->cc_mask | X_FLAG; if (x) { z = flags & Z_FLAG; mask = mask & ~z; } flags &= mask; /* all insn clear the x-flag except setf or clrf. */ ccs &= ~mask; ccs |= flags; return ccs; } uint32_t helper_evaluate_flags_muls(CPUCRISState *env, uint32_t ccs, uint32_t res, uint32_t mof) { uint32_t flags = 0; int64_t tmp; int dneg; dneg = ((int32_t)res) < 0; tmp = mof; tmp <<= 32; tmp |= res; if (tmp == 0) flags |= Z_FLAG; else if (tmp < 0) flags |= N_FLAG; if ((dneg && mof != -1) || (!dneg && mof != 0)) flags |= V_FLAG; return evaluate_flags_writeback(env, flags, ccs); } uint32_t helper_evaluate_flags_mulu(CPUCRISState *env, uint32_t ccs, uint32_t res, uint32_t mof) { uint32_t flags = 0; uint64_t tmp; tmp = mof; tmp <<= 32; tmp |= res; if (tmp == 0) flags |= Z_FLAG; else if (tmp >> 63) flags |= N_FLAG; if (mof) flags |= V_FLAG; return evaluate_flags_writeback(env, flags, ccs); } uint32_t helper_evaluate_flags_mcp(CPUCRISState *env, uint32_t ccs, uint32_t src, uint32_t dst, uint32_t res) { uint32_t flags = 0; src = src & 0x80000000; dst = dst & 0x80000000; if ((res & 0x80000000L) != 0L) { flags |= N_FLAG; if (!src && !dst) flags |= V_FLAG; else if (src & dst) flags |= R_FLAG; } else { if (res == 0L) flags |= Z_FLAG; if (src & dst) flags |= V_FLAG; if (dst | src) flags |= R_FLAG; } return evaluate_flags_writeback(env, flags, ccs); } uint32_t helper_evaluate_flags_alu_4(CPUCRISState *env, uint32_t ccs, uint32_t src, uint32_t dst, uint32_t res) { uint32_t flags = 0; src = src & 0x80000000; dst = dst & 0x80000000; if ((res & 0x80000000L) != 0L) { flags |= N_FLAG; if (!src && !dst) flags |= V_FLAG; else if (src & dst) flags |= C_FLAG; } else { if (res == 0L) flags |= Z_FLAG; if (src & dst) flags |= V_FLAG; if (dst | src) flags |= C_FLAG; } return evaluate_flags_writeback(env, flags, ccs); } uint32_t helper_evaluate_flags_sub_4(CPUCRISState *env, uint32_t ccs, uint32_t src, uint32_t dst, uint32_t res) { uint32_t flags = 0; src = (~src) & 0x80000000; dst = dst & 0x80000000; if ((res & 0x80000000L) != 0L) { flags |= N_FLAG; if (!src && !dst) flags |= V_FLAG; else if (src & dst) flags |= C_FLAG; } else { if (res == 0L) flags |= Z_FLAG; if (src & dst) flags |= V_FLAG; if (dst | src) flags |= C_FLAG; } flags ^= C_FLAG; return evaluate_flags_writeback(env, flags, ccs); } uint32_t helper_evaluate_flags_move_4(CPUCRISState *env, uint32_t ccs, uint32_t res) { uint32_t flags = 0; if ((int32_t)res < 0) flags |= N_FLAG; else if (res == 0L) flags |= Z_FLAG; return evaluate_flags_writeback(env, flags, ccs); } uint32_t helper_evaluate_flags_move_2(CPUCRISState *env, uint32_t ccs, uint32_t res) { uint32_t flags = 0; if ((int16_t)res < 0L) flags |= N_FLAG; else if (res == 0) flags |= Z_FLAG; return evaluate_flags_writeback(env, flags, ccs); } /* TODO: This is expensive. We could split things up and only evaluate part of CCR on a need to know basis. For now, we simply re-evaluate everything. */ void helper_evaluate_flags(CPUCRISState *env) { uint32_t src, dst, res; uint32_t flags = 0; src = env->cc_src; dst = env->cc_dest; res = env->cc_result; if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP) src = ~src; /* Now, evaluate the flags. This stuff is based on Per Zander's CRISv10 simulator. */ switch (env->cc_size) { case 1: if ((res & 0x80L) != 0L) { flags |= N_FLAG; if (((src & 0x80L) == 0L) && ((dst & 0x80L) == 0L)) { flags |= V_FLAG; } else if (((src & 0x80L) != 0L) && ((dst & 0x80L) != 0L)) { flags |= C_FLAG; } } else { if ((res & 0xFFL) == 0L) { flags |= Z_FLAG; } if (((src & 0x80L) != 0L) && ((dst & 0x80L) != 0L)) { flags |= V_FLAG; } if ((dst & 0x80L) != 0L || (src & 0x80L) != 0L) { flags |= C_FLAG; } } break; case 2: if ((res & 0x8000L) != 0L) { flags |= N_FLAG; if (((src & 0x8000L) == 0L) && ((dst & 0x8000L) == 0L)) { flags |= V_FLAG; } else if (((src & 0x8000L) != 0L) && ((dst & 0x8000L) != 0L)) { flags |= C_FLAG; } } else { if ((res & 0xFFFFL) == 0L) { flags |= Z_FLAG; } if (((src & 0x8000L) != 0L) && ((dst & 0x8000L) != 0L)) { flags |= V_FLAG; } if ((dst & 0x8000L) != 0L || (src & 0x8000L) != 0L) { flags |= C_FLAG; } } break; case 4: if ((res & 0x80000000L) != 0L) { flags |= N_FLAG; if (((src & 0x80000000L) == 0L) && ((dst & 0x80000000L) == 0L)) { flags |= V_FLAG; } else if (((src & 0x80000000L) != 0L) && ((dst & 0x80000000L) != 0L)) { flags |= C_FLAG; } } else { if (res == 0L) flags |= Z_FLAG; if (((src & 0x80000000L) != 0L) && ((dst & 0x80000000L) != 0L)) flags |= V_FLAG; if ((dst & 0x80000000L) != 0L || (src & 0x80000000L) != 0L) flags |= C_FLAG; } break; default: break; } if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP) flags ^= C_FLAG; env->pregs[PR_CCS] = evaluate_flags_writeback(env, flags, env->pregs[PR_CCS]); } void helper_top_evaluate_flags(CPUCRISState *env) { switch (env->cc_op) { case CC_OP_MCP: env->pregs[PR_CCS] = helper_evaluate_flags_mcp(env, env->pregs[PR_CCS], env->cc_src, env->cc_dest, env->cc_result); break; case CC_OP_MULS: env->pregs[PR_CCS] = helper_evaluate_flags_muls(env, env->pregs[PR_CCS], env->cc_result, env->pregs[PR_MOF]); break; case CC_OP_MULU: env->pregs[PR_CCS] = helper_evaluate_flags_mulu(env, env->pregs[PR_CCS], env->cc_result, env->pregs[PR_MOF]); break; case CC_OP_MOVE: case CC_OP_AND: case CC_OP_OR: case CC_OP_XOR: case CC_OP_ASR: case CC_OP_LSR: case CC_OP_LSL: switch (env->cc_size) { case 4: env->pregs[PR_CCS] = helper_evaluate_flags_move_4(env, env->pregs[PR_CCS], env->cc_result); break; case 2: env->pregs[PR_CCS] = helper_evaluate_flags_move_2(env, env->pregs[PR_CCS], env->cc_result); break; default: helper_evaluate_flags(env); break; } break; case CC_OP_FLAGS: /* live. */ break; case CC_OP_SUB: case CC_OP_CMP: if (env->cc_size == 4) env->pregs[PR_CCS] = helper_evaluate_flags_sub_4(env, env->pregs[PR_CCS], env->cc_src, env->cc_dest, env->cc_result); else helper_evaluate_flags(env); break; default: { switch (env->cc_size) { case 4: env->pregs[PR_CCS] = helper_evaluate_flags_alu_4(env, env->pregs[PR_CCS], env->cc_src, env->cc_dest, env->cc_result); break; default: helper_evaluate_flags(env); break; } } break; } }