target-tilegx: Add cpu basic features for linux-user

It implements minimized cpu features for linux-user.

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <BLU436-SMTP114819BB03D853801AA9C3CB9660@phx.gbl>
Signed-off-by: Richard Henderson <rth@twiddle.net>

2 files changed, 345 insertions, 0 deletions

diff --git a/target-tilegx/cpu.c b/target-tilegx/cpu.c
new file mode 100644
index 0000000000..87aee248b4
--- /dev/null
+++ b/target-tilegx/cpu.c
@@ -0,0 +1,170 @@
+/*
+ * QEMU TILE-Gx CPU
+ *
+ *  Copyright (c) 2015 Chen Gang
+ *
+ * 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 2.1 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/lgpl-2.1.html>
+ */
+
+#include "cpu.h"
+#include "qemu-common.h"
+#include "hw/qdev-properties.h"
+#include "migration/vmstate.h"
+
+static void tilegx_cpu_dump_state(CPUState *cs, FILE *f,
+                                  fprintf_function cpu_fprintf, int flags)
+{
+    static const char * const reg_names[TILEGX_R_COUNT] = {
+         "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
+         "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+        "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
+        "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
+        "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39",
+        "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47",
+        "r48", "r49", "r50", "r51",  "bp",  "tp",  "sp",  "lr"
+    };
+
+    TileGXCPU *cpu = TILEGX_CPU(cs);
+    CPUTLGState *env = &cpu->env;
+    int i;
+
+    for (i = 0; i < TILEGX_R_COUNT; i++) {
+        cpu_fprintf(f, "%-4s" TARGET_FMT_lx "%s",
+                    reg_names[i], env->regs[i],
+                    (i % 4) == 3 ? "\n" : " ");
+    }
+    cpu_fprintf(f, "PC  " TARGET_FMT_lx " CEX " TARGET_FMT_lx "\n\n",
+                env->pc, env->spregs[TILEGX_SPR_CMPEXCH]);
+}
+
+TileGXCPU *cpu_tilegx_init(const char *cpu_model)
+{
+    TileGXCPU *cpu;
+
+    cpu = TILEGX_CPU(object_new(TYPE_TILEGX_CPU));
+
+    object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
+
+    return cpu;
+}
+
+static void tilegx_cpu_set_pc(CPUState *cs, vaddr value)
+{
+    TileGXCPU *cpu = TILEGX_CPU(cs);
+
+    cpu->env.pc = value;
+}
+
+static bool tilegx_cpu_has_work(CPUState *cs)
+{
+    return true;
+}
+
+static void tilegx_cpu_reset(CPUState *s)
+{
+    TileGXCPU *cpu = TILEGX_CPU(s);
+    TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(cpu);
+    CPUTLGState *env = &cpu->env;
+
+    tcc->parent_reset(s);
+
+    memset(env, 0, sizeof(CPUTLGState));
+    tlb_flush(s, 1);
+}
+
+static void tilegx_cpu_realizefn(DeviceState *dev, Error **errp)
+{
+    CPUState *cs = CPU(dev);
+    TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(dev);
+
+    cpu_reset(cs);
+    qemu_init_vcpu(cs);
+
+    tcc->parent_realize(dev, errp);
+}
+
+static void tilegx_cpu_initfn(Object *obj)
+{
+    CPUState *cs = CPU(obj);
+    TileGXCPU *cpu = TILEGX_CPU(obj);
+    CPUTLGState *env = &cpu->env;
+    static bool tcg_initialized;
+
+    cs->env_ptr = env;
+    cpu_exec_init(cs, &error_abort);
+
+    if (tcg_enabled() && !tcg_initialized) {
+        tcg_initialized = true;
+        tilegx_tcg_init();
+    }
+}
+
+static void tilegx_cpu_do_interrupt(CPUState *cs)
+{
+    cs->exception_index = -1;
+}
+
+static int tilegx_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
+                                       int mmu_idx)
+{
+    cpu_dump_state(cs, stderr, fprintf, 0);
+    return 1;
+}
+
+static bool tilegx_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
+{
+    if (interrupt_request & CPU_INTERRUPT_HARD) {
+        tilegx_cpu_do_interrupt(cs);
+        return true;
+    }
+    return false;
+}
+
+static void tilegx_cpu_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+    CPUClass *cc = CPU_CLASS(oc);
+    TileGXCPUClass *tcc = TILEGX_CPU_CLASS(oc);
+
+    tcc->parent_realize = dc->realize;
+    dc->realize = tilegx_cpu_realizefn;
+
+    tcc->parent_reset = cc->reset;
+    cc->reset = tilegx_cpu_reset;
+
+    cc->has_work = tilegx_cpu_has_work;
+    cc->do_interrupt = tilegx_cpu_do_interrupt;
+    cc->cpu_exec_interrupt = tilegx_cpu_exec_interrupt;
+    cc->dump_state = tilegx_cpu_dump_state;
+    cc->set_pc = tilegx_cpu_set_pc;
+    cc->handle_mmu_fault = tilegx_cpu_handle_mmu_fault;
+    cc->gdb_num_core_regs = 0;
+}
+
+static const TypeInfo tilegx_cpu_type_info = {
+    .name = TYPE_TILEGX_CPU,
+    .parent = TYPE_CPU,
+    .instance_size = sizeof(TileGXCPU),
+    .instance_init = tilegx_cpu_initfn,
+    .class_size = sizeof(TileGXCPUClass),
+    .class_init = tilegx_cpu_class_init,
+};
+
+static void tilegx_cpu_register_types(void)
+{
+    type_register_static(&tilegx_cpu_type_info);
+}
+
+type_init(tilegx_cpu_register_types)
diff --git a/target-tilegx/cpu.h b/target-tilegx/cpu.h
new file mode 100644
index 0000000000..2c86cd3890
--- /dev/null
+++ b/target-tilegx/cpu.h
@@ -0,0 +1,175 @@
+/*
+ *  TILE-Gx virtual CPU header
+ *
+ *  Copyright (c) 2015 Chen Gang
+ *
+ * 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
+ * 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/>.
+ */
+#ifndef CPU_TILEGX_H
+#define CPU_TILEGX_H
+
+#include "config.h"
+#include "qemu-common.h"
+
+#define TARGET_LONG_BITS 64
+
+#define CPUArchState struct CPUTLGState
+
+#include "exec/cpu-defs.h"
+
+
+/* TILE-Gx common register alias */
+#define TILEGX_R_RE    0   /*  0 register, for function/syscall return value */
+#define TILEGX_R_ERR   1   /*  1 register, for syscall errno flag */
+#define TILEGX_R_NR    10  /* 10 register, for syscall number */
+#define TILEGX_R_BP    52  /* 52 register, optional frame pointer */
+#define TILEGX_R_TP    53  /* TP register, thread local storage data */
+#define TILEGX_R_SP    54  /* SP register, stack pointer */
+#define TILEGX_R_LR    55  /* LR register, may save pc, but it is not pc */
+#define TILEGX_R_COUNT 56  /* Only 56 registers are really useful */
+#define TILEGX_R_SN    56  /* SN register, obsoleted, it likes zero register */
+#define TILEGX_R_IDN0  57  /* IDN0 register, cause IDN_ACCESS exception */
+#define TILEGX_R_IDN1  58  /* IDN1 register, cause IDN_ACCESS exception */
+#define TILEGX_R_UDN0  59  /* UDN0 register, cause UDN_ACCESS exception */
+#define TILEGX_R_UDN1  60  /* UDN1 register, cause UDN_ACCESS exception */
+#define TILEGX_R_UDN2  61  /* UDN2 register, cause UDN_ACCESS exception */
+#define TILEGX_R_UDN3  62  /* UDN3 register, cause UDN_ACCESS exception */
+#define TILEGX_R_ZERO  63  /* Zero register, always zero */
+#define TILEGX_R_NOREG 255 /* Invalid register value */
+
+/* TILE-Gx special registers used by outside */
+enum {
+    TILEGX_SPR_CMPEXCH = 0,
+    TILEGX_SPR_CRITICAL_SEC = 1,
+    TILEGX_SPR_SIM_CONTROL = 2,
+    TILEGX_SPR_COUNT
+};
+
+/* Exception numbers */
+typedef enum {
+    TILEGX_EXCP_NONE = 0,
+    TILEGX_EXCP_SYSCALL = 1,
+    TILEGX_EXCP_OPCODE_UNKNOWN = 0x101,
+    TILEGX_EXCP_OPCODE_UNIMPLEMENTED = 0x102,
+    TILEGX_EXCP_OPCODE_CMPEXCH = 0x103,
+    TILEGX_EXCP_OPCODE_CMPEXCH4 = 0x104,
+    TILEGX_EXCP_OPCODE_EXCH = 0x105,
+    TILEGX_EXCP_OPCODE_EXCH4 = 0x106,
+    TILEGX_EXCP_OPCODE_FETCHADD = 0x107,
+    TILEGX_EXCP_OPCODE_FETCHADD4 = 0x108,
+    TILEGX_EXCP_OPCODE_FETCHADDGEZ = 0x109,
+    TILEGX_EXCP_OPCODE_FETCHADDGEZ4 = 0x10a,
+    TILEGX_EXCP_OPCODE_FETCHAND = 0x10b,
+    TILEGX_EXCP_OPCODE_FETCHAND4 = 0x10c,
+    TILEGX_EXCP_OPCODE_FETCHOR = 0x10d,
+    TILEGX_EXCP_OPCODE_FETCHOR4 = 0x10e,
+    TILEGX_EXCP_REG_IDN_ACCESS = 0x181,
+    TILEGX_EXCP_REG_UDN_ACCESS = 0x182,
+    TILEGX_EXCP_UNALIGNMENT = 0x201,
+    TILEGX_EXCP_DBUG_BREAK = 0x301
+} TileExcp;
+
+typedef struct CPUTLGState {
+    uint64_t regs[TILEGX_R_COUNT];     /* Common used registers by outside */
+    uint64_t spregs[TILEGX_SPR_COUNT]; /* Special used registers by outside */
+    uint64_t pc;                       /* Current pc */
+
+#if defined(CONFIG_USER_ONLY)
+    uint32_t excparam;                 /* exception parameter */
+#endif
+
+    CPU_COMMON
+} CPUTLGState;
+
+#include "qom/cpu.h"
+
+#define TYPE_TILEGX_CPU "tilegx-cpu"
+
+#define TILEGX_CPU_CLASS(klass) \
+    OBJECT_CLASS_CHECK(TileGXCPUClass, (klass), TYPE_TILEGX_CPU)
+#define TILEGX_CPU(obj) \
+    OBJECT_CHECK(TileGXCPU, (obj), TYPE_TILEGX_CPU)
+#define TILEGX_CPU_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(TileGXCPUClass, (obj), TYPE_TILEGX_CPU)
+
+/**
+ * TileGXCPUClass:
+ * @parent_realize: The parent class' realize handler.
+ * @parent_reset: The parent class' reset handler.
+ *
+ * A Tile-Gx CPU model.
+ */
+typedef struct TileGXCPUClass {
+    /*< private >*/
+    CPUClass parent_class;
+    /*< public >*/
+
+    DeviceRealize parent_realize;
+    void (*parent_reset)(CPUState *cpu);
+} TileGXCPUClass;
+
+/**
+ * TileGXCPU:
+ * @env: #CPUTLGState
+ *
+ * A Tile-GX CPU.
+ */
+typedef struct TileGXCPU {
+    /*< private >*/
+    CPUState parent_obj;
+    /*< public >*/
+
+    CPUTLGState env;
+} TileGXCPU;
+
+static inline TileGXCPU *tilegx_env_get_cpu(CPUTLGState *env)
+{
+    return container_of(env, TileGXCPU, env);
+}
+
+#define ENV_GET_CPU(e) CPU(tilegx_env_get_cpu(e))
+
+#define ENV_OFFSET offsetof(TileGXCPU, env)
+
+/* TILE-Gx memory attributes */
+#define TARGET_PAGE_BITS 16  /* TILE-Gx uses 64KB page size */
+#define TARGET_PHYS_ADDR_SPACE_BITS 42
+#define TARGET_VIRT_ADDR_SPACE_BITS 64
+#define MMU_USER_IDX    0  /* Current memory operation is in user mode */
+
+#include "exec/cpu-all.h"
+
+void tilegx_tcg_init(void);
+int cpu_tilegx_exec(CPUState *s);
+int cpu_tilegx_signal_handler(int host_signum, void *pinfo, void *puc);
+
+TileGXCPU *cpu_tilegx_init(const char *cpu_model);
+
+#define cpu_init(cpu_model) CPU(cpu_tilegx_init(cpu_model))
+
+#define cpu_exec cpu_tilegx_exec
+#define cpu_gen_code cpu_tilegx_gen_code
+#define cpu_signal_handler cpu_tilegx_signal_handler
+
+static inline void cpu_get_tb_cpu_state(CPUTLGState *env, target_ulong *pc,
+                                        target_ulong *cs_base, int *flags)
+{
+    *pc = env->pc;
+    *cs_base = 0;
+    *flags = 0;
+}
+
+#include "exec/exec-all.h"
+
+#endif