/* * sparc helpers * * Copyright (c) 2003 Fabrice Bellard * * 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, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "exec.h" //#define DEBUG_PCALL //#define DEBUG_MMU /* Sparc MMU emulation */ /* thread support */ spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED; void cpu_lock(void) { spin_lock(&global_cpu_lock); } void cpu_unlock(void) { spin_unlock(&global_cpu_lock); } #if defined(CONFIG_USER_ONLY) int cpu_sparc_handle_mmu_fault(CPUState *env, target_ulong address, int rw, int is_user, int is_softmmu) { env->mmuregs[4] = address; if (rw & 2) env->exception_index = TT_TFAULT; else env->exception_index = TT_DFAULT; return 1; } #else #define MMUSUFFIX _mmu #define GETPC() (__builtin_return_address(0)) #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 is_user, void *retaddr) { TranslationBlock *tb; int ret; unsigned long pc; 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; ret = cpu_sparc_handle_mmu_fault(env, addr, is_write, is_user, 1); if (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, (void *)T2); } } cpu_loop_exit(); } env = saved_env; } static const int access_table[8][8] = { { 0, 0, 0, 0, 2, 0, 3, 3 }, { 0, 0, 0, 0, 2, 0, 0, 0 }, { 2, 2, 0, 0, 0, 2, 3, 3 }, { 2, 2, 0, 0, 0, 2, 0, 0 }, { 2, 0, 2, 0, 2, 2, 3, 3 }, { 2, 0, 2, 0, 2, 0, 2, 0 }, { 2, 2, 2, 0, 2, 2, 3, 3 }, { 2, 2, 2, 0, 2, 2, 2, 0 } }; /* 1 = write OK */ static const int rw_table[2][8] = { { 0, 1, 0, 1, 0, 1, 0, 1 }, { 0, 1, 0, 1, 0, 0, 0, 0 } }; int get_physical_address (CPUState *env, target_phys_addr_t *physical, int *prot, int *access_index, target_ulong address, int rw, int is_user) { int access_perms = 0; target_phys_addr_t pde_ptr; uint32_t pde; target_ulong virt_addr; int error_code = 0, is_dirty; unsigned long page_offset; virt_addr = address & TARGET_PAGE_MASK; if ((env->mmuregs[0] & MMU_E) == 0) { /* MMU disabled */ *physical = address; *prot = PAGE_READ | PAGE_WRITE; return 0; } *access_index = ((rw & 1) << 2) | (rw & 2) | (is_user? 0 : 1); *physical = 0xfffff000; /* SPARC reference MMU table walk: Context table->L1->L2->PTE */ /* Context base + context number */ pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 4); pde = ldl_phys(pde_ptr); /* Ctx pde */ switch (pde & PTE_ENTRYTYPE_MASK) { default: case 0: /* Invalid */ return 1 << 2; case 2: /* L0 PTE, maybe should not happen? */ case 3: /* Reserved */ return 4 << 2; case 1: /* L0 PDE */ pde_ptr = ((address >> 22) & ~3) + ((pde & ~3) << 4); pde = ldl_phys(pde_ptr); switch (pde & PTE_ENTRYTYPE_MASK) { default: case 0: /* Invalid */ return (1 << 8) | (1 << 2); case 3: /* Reserved */ return (1 << 8) | (4 << 2); case 1: /* L1 PDE */ pde_ptr = ((address & 0xfc0000) >> 16) + ((pde & ~3) << 4); pde = ldl_phys(pde_ptr); switch (pde & PTE_ENTRYTYPE_MASK) { default: case 0: /* Invalid */ return (2 << 8) | (1 << 2); case 3: /* Reserved */ return (2 << 8) | (4 << 2); case 1: /* L2 PDE */ pde_ptr = ((address & 0x3f000) >> 10) + ((pde & ~3) << 4); pde = ldl_phys(pde_ptr); switch (pde & PTE_ENTRYTYPE_MASK) { default: case 0: /* Invalid */ return (3 << 8) | (1 << 2); case 1: /* PDE, should not happen */ case 3: /* Reserved */ return (3 << 8) | (4 << 2); case 2: /* L3 PTE */ virt_addr = address & TARGET_PAGE_MASK; page_offset = (address & TARGET_PAGE_MASK) & (TARGET_PAGE_SIZE - 1); } break; case 2: /* L2 PTE */ virt_addr = address & ~0x3ffff; page_offset = address & 0x3ffff; } break; case 2: /* L1 PTE */ virt_addr = address & ~0xffffff; page_offset = address & 0xffffff; } } /* update page modified and dirty bits */ is_dirty = (rw & 1) && !(pde & PG_MODIFIED_MASK); if (!(pde & PG_ACCESSED_MASK) || is_dirty) { pde |= PG_ACCESSED_MASK; if (is_dirty) pde |= PG_MODIFIED_MASK; stl_phys_notdirty(pde_ptr, pde); } /* check access */ access_perms = (pde & PTE_ACCESS_MASK) >> PTE_ACCESS_SHIFT; error_code = access_table[*access_index][access_perms]; if (error_code && !(env->mmuregs[0] & MMU_NF)) return error_code; /* the page can be put in the TLB */ *prot = PAGE_READ; if (pde & PG_MODIFIED_MASK) { /* only set write access if already dirty... otherwise wait for dirty access */ if (rw_table[is_user][access_perms]) *prot |= PAGE_WRITE; } /* Even if large ptes, we map only one 4KB page in the cache to avoid filling it too fast */ *physical = ((pde & PTE_ADDR_MASK) << 4) + page_offset; return error_code; } /* Perform address translation */ int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw, int is_user, int is_softmmu) { target_ulong virt_addr; target_phys_addr_t paddr; unsigned long vaddr; int error_code = 0, prot, ret = 0, access_index; error_code = get_physical_address(env, &paddr, &prot, &access_index, address, rw, is_user); if (error_code == 0) { virt_addr = address & TARGET_PAGE_MASK; vaddr = virt_addr + ((address & TARGET_PAGE_MASK) & (TARGET_PAGE_SIZE - 1)); ret = tlb_set_page(env, vaddr, paddr, prot, is_user, is_softmmu); return ret; } if (env->mmuregs[3]) /* Fault status register */ env->mmuregs[3] = 1; /* overflow (not read before another fault) */ env->mmuregs[3] |= (access_index << 5) | error_code | 2; env->mmuregs[4] = address; /* Fault address register */ if ((env->mmuregs[0] & MMU_NF) || env->psret == 0) { // No fault mode: if a mapping is available, just override // permissions. If no mapping is available, redirect accesses to // neverland. Fake/overridden mappings will be flushed when // switching to normal mode. vaddr = address & TARGET_PAGE_MASK; prot = PAGE_READ | PAGE_WRITE; ret = tlb_set_page(env, vaddr, paddr, prot, is_user, is_softmmu); return ret; } else { if (rw & 2) env->exception_index = TT_TFAULT; else env->exception_index = TT_DFAULT; return 1; } } #endif void memcpy32(target_ulong *dst, const target_ulong *src) { dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; dst[4] = src[4]; dst[5] = src[5]; dst[6] = src[6]; dst[7] = src[7]; } void set_cwp(int new_cwp) { /* put the modified wrap registers at their proper location */ if (env->cwp == (NWINDOWS - 1)) memcpy32(env->regbase, env->regbase + NWINDOWS * 16); env->cwp = new_cwp; /* put the wrap registers at their temporary location */ if (new_cwp == (NWINDOWS - 1)) memcpy32(env->regbase + NWINDOWS * 16, env->regbase); env->regwptr = env->regbase + (new_cwp * 16); } void cpu_set_cwp(CPUState *env1, int new_cwp) { CPUState *saved_env; saved_env = env; env = env1; set_cwp(new_cwp); env = saved_env; } void do_interrupt(int intno) { int cwp; #ifdef DEBUG_PCALL if (loglevel & CPU_LOG_INT) { static int count; fprintf(logfile, "%6d: v=%02x pc=%08x npc=%08x SP=%08x\n", count, intno, env->pc, env->npc, env->regwptr[6]); cpu_dump_state(env, logfile, fprintf, 0); #if 0 { int i; uint8_t *ptr; fprintf(logfile, " code="); ptr = (uint8_t *)env->pc; for(i = 0; i < 16; i++) { fprintf(logfile, " %02x", ldub(ptr + i)); } fprintf(logfile, "\n"); } #endif count++; } #endif #if !defined(CONFIG_USER_ONLY) if (env->psret == 0) { cpu_abort(cpu_single_env, "Trap 0x%02x while interrupts disabled, Error state", env->exception_index); return; } #endif env->psret = 0; cwp = (env->cwp - 1) & (NWINDOWS - 1); set_cwp(cwp); env->regwptr[9] = env->pc; env->regwptr[10] = env->npc; env->psrps = env->psrs; env->psrs = 1; env->tbr = (env->tbr & TBR_BASE_MASK) | (intno << 4); env->pc = env->tbr; env->npc = env->pc + 4; env->exception_index = 0; } target_ulong mmu_probe(target_ulong address, int mmulev) { target_phys_addr_t pde_ptr; uint32_t pde; /* Context base + context number */ pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 4); pde = ldl_phys(pde_ptr); switch (pde & PTE_ENTRYTYPE_MASK) { default: case 0: /* Invalid */ case 2: /* PTE, maybe should not happen? */ case 3: /* Reserved */ return 0; case 1: /* L1 PDE */ if (mmulev == 3) return pde; pde_ptr = ((address >> 22) & ~3) + ((pde & ~3) << 4); pde = ldl_phys(pde_ptr); switch (pde & PTE_ENTRYTYPE_MASK) { default: case 0: /* Invalid */ case 3: /* Reserved */ return 0; case 2: /* L1 PTE */ return pde; case 1: /* L2 PDE */ if (mmulev == 2) return pde; pde_ptr = ((address & 0xfc0000) >> 16) + ((pde & ~3) << 4); pde = ldl_phys(pde_ptr); switch (pde & PTE_ENTRYTYPE_MASK) { default: case 0: /* Invalid */ case 3: /* Reserved */ return 0; case 2: /* L2 PTE */ return pde; case 1: /* L3 PDE */ if (mmulev == 1) return pde; pde_ptr = ((address & 0x3f000) >> 10) + ((pde & ~3) << 4); pde = ldl_phys(pde_ptr); switch (pde & PTE_ENTRYTYPE_MASK) { default: case 0: /* Invalid */ case 1: /* PDE, should not happen */ case 3: /* Reserved */ return 0; case 2: /* L3 PTE */ return pde; } } } } return 0; } #ifdef DEBUG_MMU void dump_mmu(void) { target_ulong va, va1, va2; unsigned int n, m, o; target_phys_addr_t pde_ptr, pa; uint32_t pde; printf("MMU dump:\n"); pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 4); pde = ldl_phys(pde_ptr); printf("Root ptr: " TARGET_FMT_lx ", ctx: %d\n", env->mmuregs[1] << 4, env->mmuregs[2]); for (n = 0, va = 0; n < 256; n++, va += 16 * 1024 * 1024) { pde_ptr = mmu_probe(va, 2); if (pde_ptr) { pa = cpu_get_phys_page_debug(env, va); printf("VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PDE: " TARGET_FMT_lx "\n", va, pa, pde_ptr); for (m = 0, va1 = va; m < 64; m++, va1 += 256 * 1024) { pde_ptr = mmu_probe(va1, 1); if (pde_ptr) { pa = cpu_get_phys_page_debug(env, va1); printf(" VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PDE: " TARGET_FMT_lx "\n", va1, pa, pde_ptr); for (o = 0, va2 = va1; o < 64; o++, va2 += 4 * 1024) { pde_ptr = mmu_probe(va2, 0); if (pde_ptr) { pa = cpu_get_phys_page_debug(env, va2); printf(" VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PTE: " TARGET_FMT_lx "\n", va2, pa, pde_ptr); } } } } } } printf("MMU dump ends\n"); } #endif