/* * Microblaze helper routines. * * Copyright (c) 2009 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 . */ #include #include "exec.h" #include "helper.h" #include "host-utils.h" #define D(x) #if !defined(CONFIG_USER_ONLY) #define MMUSUFFIX _mmu #define SHIFT 0 #include "softmmu_template.h" #define SHIFT 1 #include "softmmu_template.h" #define SHIFT 2 #include "softmmu_template.h" #define SHIFT 3 #include "softmmu_template.h" /* 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) */ /* XXX: fix it to restore all registers */ void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr) { TranslationBlock *tb; CPUState *saved_env; unsigned long pc; int ret; /* XXX: hack to restore env in all cases, even if not called from generated code */ saved_env = env; env = cpu_single_env; ret = cpu_mb_handle_mmu_fault(env, addr, is_write, mmu_idx, 1); if (unlikely(ret)) { if (retaddr) { /* now we have a real cpu fault */ pc = (unsigned long)retaddr; tb = tb_find_pc(pc); if (tb) { /* the PC is inside the translated code. It means that we have a virtual CPU fault */ cpu_restore_state(tb, env, pc, NULL); } } cpu_loop_exit(); } env = saved_env; } #endif void helper_raise_exception(uint32_t index) { env->exception_index = index; cpu_loop_exit(); } void helper_debug(void) { int i; qemu_log("PC=%8.8x\n", env->sregs[SR_PC]); for (i = 0; i < 32; i++) { qemu_log("r%2.2d=%8.8x ", i, env->regs[i]); if ((i + 1) % 4 == 0) qemu_log("\n"); } qemu_log("\n\n"); } static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin) { uint32_t cout = 0; if ((b == ~0) && cin) cout = 1; else if ((~0 - a) < (b + cin)) cout = 1; return cout; } uint32_t helper_cmp(uint32_t a, uint32_t b) { uint32_t t; t = b + ~a + 1; if ((b & 0x80000000) ^ (a & 0x80000000)) t = (t & 0x7fffffff) | (b & 0x80000000); return t; } uint32_t helper_cmpu(uint32_t a, uint32_t b) { uint32_t t; t = b + ~a + 1; if ((b & 0x80000000) ^ (a & 0x80000000)) t = (t & 0x7fffffff) | (a & 0x80000000); return t; } uint32_t helper_addkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c) { uint32_t d, cf = 0, ncf; if (c) cf = env->sregs[SR_MSR] >> 31; assert(cf == 0 || cf == 1); d = a + b + cf; if (!k) { ncf = compute_carry(a, b, cf); assert(ncf == 0 || ncf == 1); if (ncf) env->sregs[SR_MSR] |= MSR_C | MSR_CC; else env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC); } D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n", d, a, b, cf, ncf, k, c)); return d; } uint32_t helper_subkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c) { uint32_t d, cf = 1, ncf; if (c) cf = env->sregs[SR_MSR] >> 31; assert(cf == 0 || cf == 1); d = b + ~a + cf; if (!k) { ncf = compute_carry(b, ~a, cf); assert(ncf == 0 || ncf == 1); if (ncf) env->sregs[SR_MSR] |= MSR_C | MSR_CC; else env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC); } D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n", d, a, b, cf, ncf, k, c)); return d; } static inline int div_prepare(uint32_t a, uint32_t b) { if (b == 0) { env->sregs[SR_MSR] |= MSR_DZ; if ((env->sregs[SR_MSR] & MSR_EE) && !(env->pvr.regs[2] & PVR2_DIV_ZERO_EXC_MASK)) { env->sregs[SR_ESR] = ESR_EC_DIVZERO; helper_raise_exception(EXCP_HW_EXCP); } return 0; } env->sregs[SR_MSR] &= ~MSR_DZ; return 1; } uint32_t helper_divs(uint32_t a, uint32_t b) { if (!div_prepare(a, b)) return 0; return (int32_t)a / (int32_t)b; } uint32_t helper_divu(uint32_t a, uint32_t b) { if (!div_prepare(a, b)) return 0; return a / b; } uint32_t helper_pcmpbf(uint32_t a, uint32_t b) { unsigned int i; uint32_t mask = 0xff000000; for (i = 0; i < 4; i++) { if ((a & mask) == (b & mask)) return i + 1; mask >>= 8; } return 0; } void helper_memalign(uint32_t addr, uint32_t dr, uint32_t wr, uint32_t mask) { if (addr & mask) { qemu_log_mask(CPU_LOG_INT, "unaligned access addr=%x mask=%x, wr=%d dr=r%d\n", addr, mask, wr, dr); env->sregs[SR_EAR] = addr; env->sregs[SR_ESR] = ESR_EC_UNALIGNED_DATA | (wr << 10) \ | (dr & 31) << 5; if (mask == 3) { env->sregs[SR_ESR] |= 1 << 11; } if (!(env->sregs[SR_MSR] & MSR_EE)) { return; } helper_raise_exception(EXCP_HW_EXCP); } } #if !defined(CONFIG_USER_ONLY) /* Writes/reads to the MMU's special regs end up here. */ uint32_t helper_mmu_read(uint32_t rn) { return mmu_read(env, rn); } void helper_mmu_write(uint32_t rn, uint32_t v) { mmu_write(env, rn, v); } #endif void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec, int is_asi, int size) { CPUState *saved_env; /* XXX: hack to restore env in all cases, even if not called from generated code */ saved_env = env; env = cpu_single_env; qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n", addr, is_write, is_exec); if (!(env->sregs[SR_MSR] & MSR_EE)) { return; } env->sregs[SR_EAR] = addr; if (is_exec) { if ((env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) { env->sregs[SR_ESR] = ESR_EC_INSN_BUS; helper_raise_exception(EXCP_HW_EXCP); } } else { if ((env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) { env->sregs[SR_ESR] = ESR_EC_DATA_BUS; helper_raise_exception(EXCP_HW_EXCP); } } }