Move target-* CPU file into a target/ folder

We've currently got 18 architectures in QEMU, and thus 18 target-xxx
folders in the root folder of the QEMU source tree. More architectures
(e.g. RISC-V, AVR) are likely to be included soon, too, so the main
folder of the QEMU sources slowly gets quite overcrowded with the
target-xxx folders.
To disburden the main folder a little bit, let's move the target-xxx
folders into a dedicated target/ folder, so that target-xxx/ simply
becomes target/xxx/ instead.

Acked-by: Laurent Vivier <laurent@vivier.eu> [m68k part]
Acked-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> [tricore part]
Acked-by: Michael Walle <michael@walle.cc> [lm32 part]
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> [s390x part]
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> [s390x part]
Acked-by: Eduardo Habkost <ehabkost@redhat.com> [i386 part]
Acked-by: Artyom Tarasenko <atar4qemu@gmail.com> [sparc part]
Acked-by: Richard Henderson <rth@twiddle.net> [alpha part]
Acked-by: Max Filippov <jcmvbkbc@gmail.com> [xtensa part]
Reviewed-by: David Gibson <david@gibson.dropbear.id.au> [ppc part]
Acked-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> [cris&microblaze part]
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn> [unicore32 part]
Signed-off-by: Thomas Huth <thuth@redhat.com>

target/ppc/mmu-hash32.c

@@ -0,0 +1,568 @@
+/*
+ *  PowerPC MMU, TLB and BAT emulation helpers for QEMU.
+ *
+ *  Copyright (c) 2003-2007 Jocelyn Mayer
+ *  Copyright (c) 2013 David Gibson, IBM Corporation
+ *
+ * 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 "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/exec-all.h"
+#include "exec/helper-proto.h"
+#include "sysemu/kvm.h"
+#include "kvm_ppc.h"
+#include "mmu-hash32.h"
+#include "exec/log.h"
+
+//#define DEBUG_BAT
+
+#ifdef DEBUG_BATS
+#  define LOG_BATS(...) qemu_log_mask(CPU_LOG_MMU, __VA_ARGS__)
+#else
+#  define LOG_BATS(...) do { } while (0)
+#endif
+
+struct mmu_ctx_hash32 {
+    hwaddr raddr;      /* Real address              */
+    int prot;                      /* Protection bits           */
+    int key;                       /* Access key                */
+};
+
+static int ppc_hash32_pp_prot(int key, int pp, int nx)
+{
+    int prot;
+
+    if (key == 0) {
+        switch (pp) {
+        case 0x0:
+        case 0x1:
+        case 0x2:
+            prot = PAGE_READ | PAGE_WRITE;
+            break;
+
+        case 0x3:
+            prot = PAGE_READ;
+            break;
+
+        default:
+            abort();
+        }
+    } else {
+        switch (pp) {
+        case 0x0:
+            prot = 0;
+            break;
+
+        case 0x1:
+        case 0x3:
+            prot = PAGE_READ;
+            break;
+
+        case 0x2:
+            prot = PAGE_READ | PAGE_WRITE;
+            break;
+
+        default:
+            abort();
+        }
+    }
+    if (nx == 0) {
+        prot |= PAGE_EXEC;
+    }
+
+    return prot;
+}
+
+static int ppc_hash32_pte_prot(PowerPCCPU *cpu,
+                               target_ulong sr, ppc_hash_pte32_t pte)
+{
+    CPUPPCState *env = &cpu->env;
+    unsigned pp, key;
+
+    key = !!(msr_pr ? (sr & SR32_KP) : (sr & SR32_KS));
+    pp = pte.pte1 & HPTE32_R_PP;
+
+    return ppc_hash32_pp_prot(key, pp, !!(sr & SR32_NX));
+}
+
+static target_ulong hash32_bat_size(PowerPCCPU *cpu,
+                                    target_ulong batu, target_ulong batl)
+{
+    CPUPPCState *env = &cpu->env;
+
+    if ((msr_pr && !(batu & BATU32_VP))
+        || (!msr_pr && !(batu & BATU32_VS))) {
+        return 0;
+    }
+
+    return BATU32_BEPI & ~((batu & BATU32_BL) << 15);
+}
+
+static int hash32_bat_prot(PowerPCCPU *cpu,
+                           target_ulong batu, target_ulong batl)
+{
+    int pp, prot;
+
+    prot = 0;
+    pp = batl & BATL32_PP;
+    if (pp != 0) {
+        prot = PAGE_READ | PAGE_EXEC;
+        if (pp == 0x2) {
+            prot |= PAGE_WRITE;
+        }
+    }
+    return prot;
+}
+
+static target_ulong hash32_bat_601_size(PowerPCCPU *cpu,
+                                target_ulong batu, target_ulong batl)
+{
+    if (!(batl & BATL32_601_V)) {
+        return 0;
+    }
+
+    return BATU32_BEPI & ~((batl & BATL32_601_BL) << 17);
+}
+
+static int hash32_bat_601_prot(PowerPCCPU *cpu,
+                               target_ulong batu, target_ulong batl)
+{
+    CPUPPCState *env = &cpu->env;
+    int key, pp;
+
+    pp = batu & BATU32_601_PP;
+    if (msr_pr == 0) {
+        key = !!(batu & BATU32_601_KS);
+    } else {
+        key = !!(batu & BATU32_601_KP);
+    }
+    return ppc_hash32_pp_prot(key, pp, 0);
+}
+
+static hwaddr ppc_hash32_bat_lookup(PowerPCCPU *cpu, target_ulong ea, int rwx,
+                                    int *prot)
+{
+    CPUPPCState *env = &cpu->env;
+    target_ulong *BATlt, *BATut;
+    int i;
+
+    LOG_BATS("%s: %cBAT v " TARGET_FMT_lx "\n", __func__,
+             rwx == 2 ? 'I' : 'D', ea);
+    if (rwx == 2) {
+        BATlt = env->IBAT[1];
+        BATut = env->IBAT[0];
+    } else {
+        BATlt = env->DBAT[1];
+        BATut = env->DBAT[0];
+    }
+    for (i = 0; i < env->nb_BATs; i++) {
+        target_ulong batu = BATut[i];
+        target_ulong batl = BATlt[i];
+        target_ulong mask;
+
+        if (unlikely(env->mmu_model == POWERPC_MMU_601)) {
+            mask = hash32_bat_601_size(cpu, batu, batl);
+        } else {
+            mask = hash32_bat_size(cpu, batu, batl);
+        }
+        LOG_BATS("%s: %cBAT%d v " TARGET_FMT_lx " BATu " TARGET_FMT_lx
+                 " BATl " TARGET_FMT_lx "\n", __func__,
+                 type == ACCESS_CODE ? 'I' : 'D', i, ea, batu, batl);
+
+        if (mask && ((ea & mask) == (batu & BATU32_BEPI))) {
+            hwaddr raddr = (batl & mask) | (ea & ~mask);
+
+            if (unlikely(env->mmu_model == POWERPC_MMU_601)) {
+                *prot = hash32_bat_601_prot(cpu, batu, batl);
+            } else {
+                *prot = hash32_bat_prot(cpu, batu, batl);
+            }
+
+            return raddr & TARGET_PAGE_MASK;
+        }
+    }
+
+    /* No hit */
+#if defined(DEBUG_BATS)
+    if (qemu_log_enabled()) {
+        LOG_BATS("no BAT match for " TARGET_FMT_lx ":\n", ea);
+        for (i = 0; i < 4; i++) {
+            BATu = &BATut[i];
+            BATl = &BATlt[i];
+            BEPIu = *BATu & BATU32_BEPIU;
+            BEPIl = *BATu & BATU32_BEPIL;
+            bl = (*BATu & 0x00001FFC) << 15;
+            LOG_BATS("%s: %cBAT%d v " TARGET_FMT_lx " BATu " TARGET_FMT_lx
+                     " BATl " TARGET_FMT_lx "\n\t" TARGET_FMT_lx " "
+                     TARGET_FMT_lx " " TARGET_FMT_lx "\n",
+                     __func__, type == ACCESS_CODE ? 'I' : 'D', i, ea,
+                     *BATu, *BATl, BEPIu, BEPIl, bl);
+        }
+    }
+#endif
+
+    return -1;
+}
+
+static int ppc_hash32_direct_store(PowerPCCPU *cpu, target_ulong sr,
+                                   target_ulong eaddr, int rwx,
+                                   hwaddr *raddr, int *prot)
+{
+    CPUState *cs = CPU(cpu);
+    CPUPPCState *env = &cpu->env;
+    int key = !!(msr_pr ? (sr & SR32_KP) : (sr & SR32_KS));
+
+    qemu_log_mask(CPU_LOG_MMU, "direct store...\n");
+
+    if ((sr & 0x1FF00000) >> 20 == 0x07f) {
+        /* Memory-forced I/O controller interface access */
+        /* If T=1 and BUID=x'07F', the 601 performs a memory access
+         * to SR[28-31] LA[4-31], bypassing all protection mechanisms.
+         */
+        *raddr = ((sr & 0xF) << 28) | (eaddr & 0x0FFFFFFF);
+        *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+        return 0;
+    }
+
+    if (rwx == 2) {
+        /* No code fetch is allowed in direct-store areas */
+        cs->exception_index = POWERPC_EXCP_ISI;
+        env->error_code = 0x10000000;
+        return 1;
+    }
+
+    switch (env->access_type) {
+    case ACCESS_INT:
+        /* Integer load/store : only access allowed */
+        break;
+    case ACCESS_FLOAT:
+        /* Floating point load/store */
+        cs->exception_index = POWERPC_EXCP_ALIGN;
+        env->error_code = POWERPC_EXCP_ALIGN_FP;
+        env->spr[SPR_DAR] = eaddr;
+        return 1;
+    case ACCESS_RES:
+        /* lwarx, ldarx or srwcx. */
+        env->error_code = 0;
+        env->spr[SPR_DAR] = eaddr;
+        if (rwx == 1) {
+            env->spr[SPR_DSISR] = 0x06000000;
+        } else {
+            env->spr[SPR_DSISR] = 0x04000000;
+        }
+        return 1;
+    case ACCESS_CACHE:
+        /* dcba, dcbt, dcbtst, dcbf, dcbi, dcbst, dcbz, or icbi */
+        /* Should make the instruction do no-op.
+         * As it already do no-op, it's quite easy :-)
+         */
+        *raddr = eaddr;
+        return 0;
+    case ACCESS_EXT:
+        /* eciwx or ecowx */
+        cs->exception_index = POWERPC_EXCP_DSI;
+        env->error_code = 0;
+        env->spr[SPR_DAR] = eaddr;
+        if (rwx == 1) {
+            env->spr[SPR_DSISR] = 0x06100000;
+        } else {
+            env->spr[SPR_DSISR] = 0x04100000;
+        }
+        return 1;
+    default:
+        cpu_abort(cs, "ERROR: instruction should not need "
+                 "address translation\n");
+    }
+    if ((rwx == 1 || key != 1) && (rwx == 0 || key != 0)) {
+        *raddr = eaddr;
+        return 0;
+    } else {
+        cs->exception_index = POWERPC_EXCP_DSI;
+        env->error_code = 0;
+        env->spr[SPR_DAR] = eaddr;
+        if (rwx == 1) {
+            env->spr[SPR_DSISR] = 0x0a000000;
+        } else {
+            env->spr[SPR_DSISR] = 0x08000000;
+        }
+        return 1;
+    }
+}
+
+hwaddr get_pteg_offset32(PowerPCCPU *cpu, hwaddr hash)
+{
+    CPUPPCState *env = &cpu->env;
+
+    return (hash * HASH_PTEG_SIZE_32) & env->htab_mask;
+}
+
+static hwaddr ppc_hash32_pteg_search(PowerPCCPU *cpu, hwaddr pteg_off,
+                                     bool secondary, target_ulong ptem,
+                                     ppc_hash_pte32_t *pte)
+{
+    hwaddr pte_offset = pteg_off;
+    target_ulong pte0, pte1;
+    int i;
+
+    for (i = 0; i < HPTES_PER_GROUP; i++) {
+        pte0 = ppc_hash32_load_hpte0(cpu, pte_offset);
+        pte1 = ppc_hash32_load_hpte1(cpu, pte_offset);
+
+        if ((pte0 & HPTE32_V_VALID)
+            && (secondary == !!(pte0 & HPTE32_V_SECONDARY))
+            && HPTE32_V_COMPARE(pte0, ptem)) {
+            pte->pte0 = pte0;
+            pte->pte1 = pte1;
+            return pte_offset;
+        }
+
+        pte_offset += HASH_PTE_SIZE_32;
+    }
+
+    return -1;
+}
+
+static hwaddr ppc_hash32_htab_lookup(PowerPCCPU *cpu,
+                                     target_ulong sr, target_ulong eaddr,
+                                     ppc_hash_pte32_t *pte)
+{
+    CPUPPCState *env = &cpu->env;
+    hwaddr pteg_off, pte_offset;
+    hwaddr hash;
+    uint32_t vsid, pgidx, ptem;
+
+    vsid = sr & SR32_VSID;
+    pgidx = (eaddr & ~SEGMENT_MASK_256M) >> TARGET_PAGE_BITS;
+    hash = vsid ^ pgidx;
+    ptem = (vsid << 7) | (pgidx >> 10);
+
+    /* Page address translation */
+    qemu_log_mask(CPU_LOG_MMU, "htab_base " TARGET_FMT_plx
+            " htab_mask " TARGET_FMT_plx
+            " hash " TARGET_FMT_plx "\n",
+            env->htab_base, env->htab_mask, hash);
+
+    /* Primary PTEG lookup */
+    qemu_log_mask(CPU_LOG_MMU, "0 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
+            " vsid=%" PRIx32 " ptem=%" PRIx32
+            " hash=" TARGET_FMT_plx "\n",
+            env->htab_base, env->htab_mask, vsid, ptem, hash);
+    pteg_off = get_pteg_offset32(cpu, hash);
+    pte_offset = ppc_hash32_pteg_search(cpu, pteg_off, 0, ptem, pte);
+    if (pte_offset == -1) {
+        /* Secondary PTEG lookup */
+        qemu_log_mask(CPU_LOG_MMU, "1 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
+                " vsid=%" PRIx32 " api=%" PRIx32
+                " hash=" TARGET_FMT_plx "\n", env->htab_base,
+                env->htab_mask, vsid, ptem, ~hash);
+        pteg_off = get_pteg_offset32(cpu, ~hash);
+        pte_offset = ppc_hash32_pteg_search(cpu, pteg_off, 1, ptem, pte);
+    }
+
+    return pte_offset;
+}
+
+static hwaddr ppc_hash32_pte_raddr(target_ulong sr, ppc_hash_pte32_t pte,
+                                   target_ulong eaddr)
+{
+    hwaddr rpn = pte.pte1 & HPTE32_R_RPN;
+    hwaddr mask = ~TARGET_PAGE_MASK;
+
+    return (rpn & ~mask) | (eaddr & mask);
+}
+
+int ppc_hash32_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr, int rwx,
+                                int mmu_idx)
+{
+    CPUState *cs = CPU(cpu);
+    CPUPPCState *env = &cpu->env;
+    target_ulong sr;
+    hwaddr pte_offset;
+    ppc_hash_pte32_t pte;
+    int prot;
+    uint32_t new_pte1;
+    const int need_prot[] = {PAGE_READ, PAGE_WRITE, PAGE_EXEC};
+    hwaddr raddr;
+
+    assert((rwx == 0) || (rwx == 1) || (rwx == 2));
+
+    /* 1. Handle real mode accesses */
+    if (((rwx == 2) && (msr_ir == 0)) || ((rwx != 2) && (msr_dr == 0))) {
+        /* Translation is off */
+        raddr = eaddr;
+        tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
+                     PAGE_READ | PAGE_WRITE | PAGE_EXEC, mmu_idx,
+                     TARGET_PAGE_SIZE);
+        return 0;
+    }
+
+    /* 2. Check Block Address Translation entries (BATs) */
+    if (env->nb_BATs != 0) {
+        raddr = ppc_hash32_bat_lookup(cpu, eaddr, rwx, &prot);
+        if (raddr != -1) {
+            if (need_prot[rwx] & ~prot) {
+                if (rwx == 2) {
+                    cs->exception_index = POWERPC_EXCP_ISI;
+                    env->error_code = 0x08000000;
+                } else {
+                    cs->exception_index = POWERPC_EXCP_DSI;
+                    env->error_code = 0;
+                    env->spr[SPR_DAR] = eaddr;
+                    if (rwx == 1) {
+                        env->spr[SPR_DSISR] = 0x0a000000;
+                    } else {
+                        env->spr[SPR_DSISR] = 0x08000000;
+                    }
+                }
+                return 1;
+            }
+
+            tlb_set_page(cs, eaddr & TARGET_PAGE_MASK,
+                         raddr & TARGET_PAGE_MASK, prot, mmu_idx,
+                         TARGET_PAGE_SIZE);
+            return 0;
+        }
+    }
+
+    /* 3. Look up the Segment Register */
+    sr = env->sr[eaddr >> 28];
+
+    /* 4. Handle direct store segments */
+    if (sr & SR32_T) {
+        if (ppc_hash32_direct_store(cpu, sr, eaddr, rwx,
+                                    &raddr, &prot) == 0) {
+            tlb_set_page(cs, eaddr & TARGET_PAGE_MASK,
+                         raddr & TARGET_PAGE_MASK, prot, mmu_idx,
+                         TARGET_PAGE_SIZE);
+            return 0;
+        } else {
+            return 1;
+        }
+    }
+
+    /* 5. Check for segment level no-execute violation */
+    if ((rwx == 2) && (sr & SR32_NX)) {
+        cs->exception_index = POWERPC_EXCP_ISI;
+        env->error_code = 0x10000000;
+        return 1;
+    }
+
+    /* 6. Locate the PTE in the hash table */
+    pte_offset = ppc_hash32_htab_lookup(cpu, sr, eaddr, &pte);
+    if (pte_offset == -1) {
+        if (rwx == 2) {
+            cs->exception_index = POWERPC_EXCP_ISI;
+            env->error_code = 0x40000000;
+        } else {
+            cs->exception_index = POWERPC_EXCP_DSI;
+            env->error_code = 0;
+            env->spr[SPR_DAR] = eaddr;
+            if (rwx == 1) {
+                env->spr[SPR_DSISR] = 0x42000000;
+            } else {
+                env->spr[SPR_DSISR] = 0x40000000;
+            }
+        }
+
+        return 1;
+    }
+    qemu_log_mask(CPU_LOG_MMU,
+                "found PTE at offset %08" HWADDR_PRIx "\n", pte_offset);
+
+    /* 7. Check access permissions */
+
+    prot = ppc_hash32_pte_prot(cpu, sr, pte);
+
+    if (need_prot[rwx] & ~prot) {
+        /* Access right violation */
+        qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n");
+        if (rwx == 2) {
+            cs->exception_index = POWERPC_EXCP_ISI;
+            env->error_code = 0x08000000;
+        } else {
+            cs->exception_index = POWERPC_EXCP_DSI;
+            env->error_code = 0;
+            env->spr[SPR_DAR] = eaddr;
+            if (rwx == 1) {
+                env->spr[SPR_DSISR] = 0x0a000000;
+            } else {
+                env->spr[SPR_DSISR] = 0x08000000;
+            }
+        }
+        return 1;
+    }
+
+    qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n");
+
+    /* 8. Update PTE referenced and changed bits if necessary */
+
+    new_pte1 = pte.pte1 | HPTE32_R_R; /* set referenced bit */
+    if (rwx == 1) {
+        new_pte1 |= HPTE32_R_C; /* set changed (dirty) bit */
+    } else {
+        /* Treat the page as read-only for now, so that a later write
+         * will pass through this function again to set the C bit */
+        prot &= ~PAGE_WRITE;
+    }
+
+    if (new_pte1 != pte.pte1) {
+        ppc_hash32_store_hpte1(cpu, pte_offset, new_pte1);
+    }
+
+    /* 9. Determine the real address from the PTE */
+
+    raddr = ppc_hash32_pte_raddr(sr, pte, eaddr);
+
+    tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
+                 prot, mmu_idx, TARGET_PAGE_SIZE);
+
+    return 0;
+}
+
+hwaddr ppc_hash32_get_phys_page_debug(PowerPCCPU *cpu, target_ulong eaddr)
+{
+    CPUPPCState *env = &cpu->env;
+    target_ulong sr;
+    hwaddr pte_offset;
+    ppc_hash_pte32_t pte;
+    int prot;
+
+    if (msr_dr == 0) {
+        /* Translation is off */
+        return eaddr;
+    }
+
+    if (env->nb_BATs != 0) {
+        hwaddr raddr = ppc_hash32_bat_lookup(cpu, eaddr, 0, &prot);
+        if (raddr != -1) {
+            return raddr;
+        }
+    }
+
+    sr = env->sr[eaddr >> 28];
+
+    if (sr & SR32_T) {
+        /* FIXME: Add suitable debug support for Direct Store segments */
+        return -1;
+    }
+
+    pte_offset = ppc_hash32_htab_lookup(cpu, sr, eaddr, &pte);
+    if (pte_offset == -1) {
+        return -1;
+    }
+
+    return ppc_hash32_pte_raddr(sr, pte, eaddr) & TARGET_PAGE_MASK;
+}