target/riscv/cpu.h - qemu - Git at Google

 /*
  * QEMU RISC-V CPU
  *
  * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
  * Copyright (c) 2017-2018 SiFive, Inc.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2 or later, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope 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 General Public License along with
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #ifndef RISCV_CPU_H
 #define RISCV_CPU_H

 #include "hw/core/cpu.h"
 #include "exec/cpu-defs.h"
 #include "fpu/softfloat-types.h"

 #define TCG_GUEST_DEFAULT_MO 0

 #define TYPE_RISCV_CPU "riscv-cpu"

 #define RISCV_CPU_TYPE_SUFFIX "-" TYPE_RISCV_CPU
 #define RISCV_CPU_TYPE_NAME(name) (name RISCV_CPU_TYPE_SUFFIX)
 #define CPU_RESOLVING_TYPE TYPE_RISCV_CPU

 #define TYPE_RISCV_CPU_ANY              RISCV_CPU_TYPE_NAME("any")
 #define TYPE_RISCV_CPU_BASE32           RISCV_CPU_TYPE_NAME("rv32")
 #define TYPE_RISCV_CPU_BASE64           RISCV_CPU_TYPE_NAME("rv64")
 #define TYPE_RISCV_CPU_SIFIVE_E31       RISCV_CPU_TYPE_NAME("sifive-e31")
 #define TYPE_RISCV_CPU_SIFIVE_E51       RISCV_CPU_TYPE_NAME("sifive-e51")
 #define TYPE_RISCV_CPU_SIFIVE_U34       RISCV_CPU_TYPE_NAME("sifive-u34")
 #define TYPE_RISCV_CPU_SIFIVE_U54       RISCV_CPU_TYPE_NAME("sifive-u54")
 /* Deprecated */
 #define TYPE_RISCV_CPU_RV32IMACU_NOMMU  RISCV_CPU_TYPE_NAME("rv32imacu-nommu")
 #define TYPE_RISCV_CPU_RV32GCSU_V1_09_1 RISCV_CPU_TYPE_NAME("rv32gcsu-v1.9.1")
 #define TYPE_RISCV_CPU_RV32GCSU_V1_10_0 RISCV_CPU_TYPE_NAME("rv32gcsu-v1.10.0")
 #define TYPE_RISCV_CPU_RV64IMACU_NOMMU  RISCV_CPU_TYPE_NAME("rv64imacu-nommu")
 #define TYPE_RISCV_CPU_RV64GCSU_V1_09_1 RISCV_CPU_TYPE_NAME("rv64gcsu-v1.9.1")
 #define TYPE_RISCV_CPU_RV64GCSU_V1_10_0 RISCV_CPU_TYPE_NAME("rv64gcsu-v1.10.0")

 #define RV32 ((target_ulong)1 << (TARGET_LONG_BITS - 2))
 #define RV64 ((target_ulong)2 << (TARGET_LONG_BITS - 2))

 #if defined(TARGET_RISCV32)
 #define RVXLEN RV32
 #elif defined(TARGET_RISCV64)
 #define RVXLEN RV64
 #endif

 #define RV(x) ((target_ulong)1 << (x - 'A'))

 #define RVI RV('I')
 #define RVE RV('E') /* E and I are mutually exclusive */
 #define RVM RV('M')
 #define RVA RV('A')
 #define RVF RV('F')
 #define RVD RV('D')
 #define RVC RV('C')
 #define RVS RV('S')
 #define RVU RV('U')

 /* S extension denotes that Supervisor mode exists, however it is possible
    to have a core that support S mode but does not have an MMU and there
    is currently no bit in misa to indicate whether an MMU exists or not
    so a cpu features bitfield is required, likewise for optional PMP support */
 enum {
     RISCV_FEATURE_MMU,
     RISCV_FEATURE_PMP,
     RISCV_FEATURE_MISA
 };

 #define PRIV_VERSION_1_09_1 0x00010901
 #define PRIV_VERSION_1_10_0 0x00011000
 #define PRIV_VERSION_1_11_0 0x00011100

 #define TRANSLATE_PMP_FAIL 2
 #define TRANSLATE_FAIL 1
 #define TRANSLATE_SUCCESS 0
 #define MMU_USER_IDX 3

 #define MAX_RISCV_PMPS (16)

 typedef struct CPURISCVState CPURISCVState;

 #include "pmp.h"

 struct CPURISCVState {
     target_ulong gpr[32];
     uint64_t fpr[32]; /* assume both F and D extensions */
     target_ulong pc;
     target_ulong load_res;
     target_ulong load_val;

     target_ulong frm;

     target_ulong badaddr;

     target_ulong priv_ver;
     target_ulong misa;
     target_ulong misa_mask;

     uint32_t features;

 #ifdef CONFIG_USER_ONLY
     uint32_t elf_flags;
 #endif

 #ifndef CONFIG_USER_ONLY
     target_ulong priv;
     target_ulong resetvec;

     target_ulong mhartid;
     target_ulong mstatus;

     /*
      * CAUTION! Unlike the rest of this struct, mip is accessed asynchonously
      * by I/O threads. It should be read with atomic_read. It should be updated
      * using riscv_cpu_update_mip with the iothread mutex held. The iothread
      * mutex must be held because mip must be consistent with the CPU inturrept
      * state. riscv_cpu_update_mip calls cpu_interrupt or cpu_reset_interrupt
      * wuth the invariant that CPU_INTERRUPT_HARD is set iff mip is non-zero.
      * mip is 32-bits to allow atomic_read on 32-bit hosts.
      */
     uint32_t mip;
     uint32_t miclaim;

     target_ulong mie;
     target_ulong mideleg;

     target_ulong sptbr;  /* until: priv-1.9.1 */
     target_ulong satp;   /* since: priv-1.10.0 */
     target_ulong sbadaddr;
     target_ulong mbadaddr;
     target_ulong medeleg;

     target_ulong stvec;
     target_ulong sepc;
     target_ulong scause;

     target_ulong mtvec;
     target_ulong mepc;
     target_ulong mcause;
     target_ulong mtval;  /* since: priv-1.10.0 */

     target_ulong scounteren;
     target_ulong mcounteren;

     target_ulong sscratch;
     target_ulong mscratch;

     /* temporary htif regs */
     uint64_t mfromhost;
     uint64_t mtohost;
     uint64_t timecmp;

     /* physical memory protection */
     pmp_table_t pmp_state;

     /* True if in debugger mode.  */
     bool debugger;
 #endif

     float_status fp_status;

     /* Fields from here on are preserved across CPU reset. */
     QEMUTimer *timer; /* Internal timer */
 };

 #define RISCV_CPU_CLASS(klass) \
     OBJECT_CLASS_CHECK(RISCVCPUClass, (klass), TYPE_RISCV_CPU)
 #define RISCV_CPU(obj) \
     OBJECT_CHECK(RISCVCPU, (obj), TYPE_RISCV_CPU)
 #define RISCV_CPU_GET_CLASS(obj) \
     OBJECT_GET_CLASS(RISCVCPUClass, (obj), TYPE_RISCV_CPU)

 /**
  * RISCVCPUClass:
  * @parent_realize: The parent class' realize handler.
  * @parent_reset: The parent class' reset handler.
  *
  * A RISCV CPU model.
  */
 typedef struct RISCVCPUClass {
     /*< private >*/
     CPUClass parent_class;
     /*< public >*/
     DeviceRealize parent_realize;
     void (*parent_reset)(CPUState *cpu);
 } RISCVCPUClass;

 /**
  * RISCVCPU:
  * @env: #CPURISCVState
  *
  * A RISCV CPU.
  */
 typedef struct RISCVCPU {
     /*< private >*/
     CPUState parent_obj;
     /*< public >*/
     CPUNegativeOffsetState neg;
     CPURISCVState env;

     /* Configuration Settings */
     struct {
         bool ext_i;
         bool ext_e;
         bool ext_g;
         bool ext_m;
         bool ext_a;
         bool ext_f;
         bool ext_d;
         bool ext_c;
         bool ext_s;
         bool ext_u;
         bool ext_counters;
         bool ext_ifencei;
         bool ext_icsr;

         char *priv_spec;
         char *user_spec;
         bool mmu;
         bool pmp;
     } cfg;
 } RISCVCPU;

 static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext)
 {
     return (env->misa & ext) != 0;
 }

 static inline bool riscv_feature(CPURISCVState *env, int feature)
 {
     return env->features & (1ULL << feature);
 }

 #include "cpu_user.h"
 #include "cpu_bits.h"

 extern const char * const riscv_int_regnames[];
 extern const char * const riscv_fpr_regnames[];
 extern const char * const riscv_excp_names[];
 extern const char * const riscv_intr_names[];

 void riscv_cpu_do_interrupt(CPUState *cpu);
 int riscv_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
 int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request);
 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch);
 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 void  riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
                                     MMUAccessType access_type, int mmu_idx,
                                     uintptr_t retaddr);
 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                         MMUAccessType access_type, int mmu_idx,
                         bool probe, uintptr_t retaddr);
 void riscv_cpu_unassigned_access(CPUState *cpu, hwaddr addr, bool is_write,
                                  bool is_exec, int unused, unsigned size);
 char *riscv_isa_string(RISCVCPU *cpu);
 void riscv_cpu_list(void);

 #define cpu_signal_handler riscv_cpu_signal_handler
 #define cpu_list riscv_cpu_list
 #define cpu_mmu_index riscv_cpu_mmu_index

 #ifndef CONFIG_USER_ONLY
 int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts);
 uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value);
 #define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value */
 #endif
 void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv);

 void riscv_translate_init(void);
 int riscv_cpu_signal_handler(int host_signum, void *pinfo, void *puc);
 void QEMU_NORETURN riscv_raise_exception(CPURISCVState *env,
                                          uint32_t exception, uintptr_t pc);

 target_ulong riscv_cpu_get_fflags(CPURISCVState *env);
 void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong);

 #define TB_FLAGS_MMU_MASK   3
 #define TB_FLAGS_MSTATUS_FS MSTATUS_FS

 static inline void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
                                         target_ulong *cs_base, uint32_t *flags)
 {
     *pc = env->pc;
     *cs_base = 0;
 #ifdef CONFIG_USER_ONLY
     *flags = TB_FLAGS_MSTATUS_FS;
 #else
     *flags = cpu_mmu_index(env, 0) | (env->mstatus & MSTATUS_FS);
 #endif
 }

 int riscv_csrrw(CPURISCVState *env, int csrno, target_ulong *ret_value,
                 target_ulong new_value, target_ulong write_mask);
 int riscv_csrrw_debug(CPURISCVState *env, int csrno, target_ulong *ret_value,
                       target_ulong new_value, target_ulong write_mask);

 static inline void riscv_csr_write(CPURISCVState *env, int csrno,
                                    target_ulong val)
 {
     riscv_csrrw(env, csrno, NULL, val, MAKE_64BIT_MASK(0, TARGET_LONG_BITS));
 }

 static inline target_ulong riscv_csr_read(CPURISCVState *env, int csrno)
 {
     target_ulong val = 0;
     riscv_csrrw(env, csrno, &val, 0, 0);
     return val;
 }

 typedef int (*riscv_csr_predicate_fn)(CPURISCVState *env, int csrno);
 typedef int (*riscv_csr_read_fn)(CPURISCVState *env, int csrno,
     target_ulong *ret_value);
 typedef int (*riscv_csr_write_fn)(CPURISCVState *env, int csrno,
     target_ulong new_value);
 typedef int (*riscv_csr_op_fn)(CPURISCVState *env, int csrno,
     target_ulong *ret_value, target_ulong new_value, target_ulong write_mask);

 typedef struct {
     riscv_csr_predicate_fn predicate;
     riscv_csr_read_fn read;
     riscv_csr_write_fn write;
     riscv_csr_op_fn op;
 } riscv_csr_operations;

 void riscv_get_csr_ops(int csrno, riscv_csr_operations *ops);
 void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops);

 void riscv_cpu_register_gdb_regs_for_features(CPUState *cs);

 typedef CPURISCVState CPUArchState;
 typedef RISCVCPU ArchCPU;

 #include "exec/cpu-all.h"

 #endif /* RISCV_CPU_H */
	/*
	* QEMU RISC-V CPU
	*
	* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
	* Copyright (c) 2017-2018 SiFive, Inc.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2 or later, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope 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 General Public License along with
	* this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#ifndef RISCV_CPU_H
	#define RISCV_CPU_H

	#include "hw/core/cpu.h"
	#include "exec/cpu-defs.h"
	#include "fpu/softfloat-types.h"

	#define TCG_GUEST_DEFAULT_MO 0

	#define TYPE_RISCV_CPU "riscv-cpu"

	#define RISCV_CPU_TYPE_SUFFIX "-" TYPE_RISCV_CPU
	#define RISCV_CPU_TYPE_NAME(name) (name RISCV_CPU_TYPE_SUFFIX)
	#define CPU_RESOLVING_TYPE TYPE_RISCV_CPU

	#define TYPE_RISCV_CPU_ANY RISCV_CPU_TYPE_NAME("any")
	#define TYPE_RISCV_CPU_BASE32 RISCV_CPU_TYPE_NAME("rv32")
	#define TYPE_RISCV_CPU_BASE64 RISCV_CPU_TYPE_NAME("rv64")
	#define TYPE_RISCV_CPU_SIFIVE_E31 RISCV_CPU_TYPE_NAME("sifive-e31")
	#define TYPE_RISCV_CPU_SIFIVE_E51 RISCV_CPU_TYPE_NAME("sifive-e51")
	#define TYPE_RISCV_CPU_SIFIVE_U34 RISCV_CPU_TYPE_NAME("sifive-u34")
	#define TYPE_RISCV_CPU_SIFIVE_U54 RISCV_CPU_TYPE_NAME("sifive-u54")
	/* Deprecated */
	#define TYPE_RISCV_CPU_RV32IMACU_NOMMU RISCV_CPU_TYPE_NAME("rv32imacu-nommu")
	#define TYPE_RISCV_CPU_RV32GCSU_V1_09_1 RISCV_CPU_TYPE_NAME("rv32gcsu-v1.9.1")
	#define TYPE_RISCV_CPU_RV32GCSU_V1_10_0 RISCV_CPU_TYPE_NAME("rv32gcsu-v1.10.0")
	#define TYPE_RISCV_CPU_RV64IMACU_NOMMU RISCV_CPU_TYPE_NAME("rv64imacu-nommu")
	#define TYPE_RISCV_CPU_RV64GCSU_V1_09_1 RISCV_CPU_TYPE_NAME("rv64gcsu-v1.9.1")
	#define TYPE_RISCV_CPU_RV64GCSU_V1_10_0 RISCV_CPU_TYPE_NAME("rv64gcsu-v1.10.0")

	#define RV32 ((target_ulong)1 << (TARGET_LONG_BITS - 2))
	#define RV64 ((target_ulong)2 << (TARGET_LONG_BITS - 2))

	#if defined(TARGET_RISCV32)
	#define RVXLEN RV32
	#elif defined(TARGET_RISCV64)
	#define RVXLEN RV64
	#endif

	#define RV(x) ((target_ulong)1 << (x - 'A'))

	#define RVI RV('I')
	#define RVE RV('E') /* E and I are mutually exclusive */
	#define RVM RV('M')
	#define RVA RV('A')
	#define RVF RV('F')
	#define RVD RV('D')
	#define RVC RV('C')
	#define RVS RV('S')
	#define RVU RV('U')

	/* S extension denotes that Supervisor mode exists, however it is possible
	to have a core that support S mode but does not have an MMU and there
	is currently no bit in misa to indicate whether an MMU exists or not
	so a cpu features bitfield is required, likewise for optional PMP support */
	enum {
	RISCV_FEATURE_MMU,
	RISCV_FEATURE_PMP,
	RISCV_FEATURE_MISA
	};

	#define PRIV_VERSION_1_09_1 0x00010901
	#define PRIV_VERSION_1_10_0 0x00011000
	#define PRIV_VERSION_1_11_0 0x00011100

	#define TRANSLATE_PMP_FAIL 2
	#define TRANSLATE_FAIL 1
	#define TRANSLATE_SUCCESS 0
	#define MMU_USER_IDX 3

	#define MAX_RISCV_PMPS (16)

	typedef struct CPURISCVState CPURISCVState;

	#include "pmp.h"

	struct CPURISCVState {
	target_ulong gpr[32];
	uint64_t fpr[32]; /* assume both F and D extensions */
	target_ulong pc;
	target_ulong load_res;
	target_ulong load_val;

	target_ulong frm;

	target_ulong badaddr;

	target_ulong priv_ver;
	target_ulong misa;
	target_ulong misa_mask;

	uint32_t features;

	#ifdef CONFIG_USER_ONLY
	uint32_t elf_flags;
	#endif

	#ifndef CONFIG_USER_ONLY
	target_ulong priv;
	target_ulong resetvec;

	target_ulong mhartid;
	target_ulong mstatus;

	/*
	* CAUTION! Unlike the rest of this struct, mip is accessed asynchonously
	* by I/O threads. It should be read with atomic_read. It should be updated
	* using riscv_cpu_update_mip with the iothread mutex held. The iothread
	* mutex must be held because mip must be consistent with the CPU inturrept
	* state. riscv_cpu_update_mip calls cpu_interrupt or cpu_reset_interrupt
	* wuth the invariant that CPU_INTERRUPT_HARD is set iff mip is non-zero.
	* mip is 32-bits to allow atomic_read on 32-bit hosts.
	*/
	uint32_t mip;
	uint32_t miclaim;

	target_ulong mie;
	target_ulong mideleg;

	target_ulong sptbr; /* until: priv-1.9.1 */
	target_ulong satp; /* since: priv-1.10.0 */
	target_ulong sbadaddr;
	target_ulong mbadaddr;
	target_ulong medeleg;

	target_ulong stvec;
	target_ulong sepc;
	target_ulong scause;

	target_ulong mtvec;
	target_ulong mepc;
	target_ulong mcause;
	target_ulong mtval; /* since: priv-1.10.0 */

	target_ulong scounteren;
	target_ulong mcounteren;

	target_ulong sscratch;
	target_ulong mscratch;

	/* temporary htif regs */
	uint64_t mfromhost;
	uint64_t mtohost;
	uint64_t timecmp;

	/* physical memory protection */
	pmp_table_t pmp_state;

	/* True if in debugger mode. */
	bool debugger;
	#endif

	float_status fp_status;

	/* Fields from here on are preserved across CPU reset. */
	QEMUTimer timer; / Internal timer */
	};

	#define RISCV_CPU_CLASS(klass) \
	OBJECT_CLASS_CHECK(RISCVCPUClass, (klass), TYPE_RISCV_CPU)
	#define RISCV_CPU(obj) \
	OBJECT_CHECK(RISCVCPU, (obj), TYPE_RISCV_CPU)
	#define RISCV_CPU_GET_CLASS(obj) \
	OBJECT_GET_CLASS(RISCVCPUClass, (obj), TYPE_RISCV_CPU)

	/**
	* RISCVCPUClass:
	* @parent_realize: The parent class' realize handler.
	* @parent_reset: The parent class' reset handler.
	*
	* A RISCV CPU model.
	*/
	typedef struct RISCVCPUClass {
	/< private >/
	CPUClass parent_class;
	/< public >/
	DeviceRealize parent_realize;
	void (parent_reset)(CPUState cpu);
	} RISCVCPUClass;

	/**
	* RISCVCPU:
	* @env: #CPURISCVState
	*
	* A RISCV CPU.
	*/
	typedef struct RISCVCPU {
	/< private >/
	CPUState parent_obj;
	/< public >/
	CPUNegativeOffsetState neg;
	CPURISCVState env;

	/* Configuration Settings */
	struct {
	bool ext_i;
	bool ext_e;
	bool ext_g;
	bool ext_m;
	bool ext_a;
	bool ext_f;
	bool ext_d;
	bool ext_c;
	bool ext_s;
	bool ext_u;
	bool ext_counters;
	bool ext_ifencei;
	bool ext_icsr;

	char *priv_spec;
	char *user_spec;
	bool mmu;
	bool pmp;
	} cfg;
	} RISCVCPU;

	static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext)
	{
	return (env->misa & ext) != 0;
	}

	static inline bool riscv_feature(CPURISCVState *env, int feature)
	{
	return env->features & (1ULL << feature);
	}

	#include "cpu_user.h"
	#include "cpu_bits.h"

	extern const char * const riscv_int_regnames[];
	extern const char * const riscv_fpr_regnames[];
	extern const char * const riscv_excp_names[];
	extern const char * const riscv_intr_names[];

	void riscv_cpu_do_interrupt(CPUState *cpu);
	int riscv_cpu_gdb_read_register(CPUState cpu, uint8_t buf, int reg);
	int riscv_cpu_gdb_write_register(CPUState cpu, uint8_t buf, int reg);
	bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request);
	int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch);
	hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
	void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
	MMUAccessType access_type, int mmu_idx,
	uintptr_t retaddr);
	bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
	MMUAccessType access_type, int mmu_idx,
	bool probe, uintptr_t retaddr);
	void riscv_cpu_unassigned_access(CPUState *cpu, hwaddr addr, bool is_write,
	bool is_exec, int unused, unsigned size);
	char riscv_isa_string(RISCVCPU cpu);
	void riscv_cpu_list(void);

	#define cpu_signal_handler riscv_cpu_signal_handler
	#define cpu_list riscv_cpu_list
	#define cpu_mmu_index riscv_cpu_mmu_index

	#ifndef CONFIG_USER_ONLY
	int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts);
	uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value);
	#define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value */
	#endif
	void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv);

	void riscv_translate_init(void);
	int riscv_cpu_signal_handler(int host_signum, void pinfo, void puc);
	void QEMU_NORETURN riscv_raise_exception(CPURISCVState *env,
	uint32_t exception, uintptr_t pc);

	target_ulong riscv_cpu_get_fflags(CPURISCVState *env);
	void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong);

	#define TB_FLAGS_MMU_MASK 3
	#define TB_FLAGS_MSTATUS_FS MSTATUS_FS

	static inline void cpu_get_tb_cpu_state(CPURISCVState env, target_ulong pc,
	target_ulong cs_base, uint32_t flags)
	{
	*pc = env->pc;
	*cs_base = 0;
	#ifdef CONFIG_USER_ONLY
	*flags = TB_FLAGS_MSTATUS_FS;
	#else
	*flags = cpu_mmu_index(env, 0) \| (env->mstatus & MSTATUS_FS);
	#endif
	}

	int riscv_csrrw(CPURISCVState env, int csrno, target_ulong ret_value,
	target_ulong new_value, target_ulong write_mask);
	int riscv_csrrw_debug(CPURISCVState env, int csrno, target_ulong ret_value,
	target_ulong new_value, target_ulong write_mask);

	static inline void riscv_csr_write(CPURISCVState *env, int csrno,
	target_ulong val)
	{
	riscv_csrrw(env, csrno, NULL, val, MAKE_64BIT_MASK(0, TARGET_LONG_BITS));
	}

	static inline target_ulong riscv_csr_read(CPURISCVState *env, int csrno)
	{
	target_ulong val = 0;
	riscv_csrrw(env, csrno, &val, 0, 0);
	return val;
	}

	typedef int (riscv_csr_predicate_fn)(CPURISCVState env, int csrno);
	typedef int (riscv_csr_read_fn)(CPURISCVState env, int csrno,
	target_ulong *ret_value);
	typedef int (riscv_csr_write_fn)(CPURISCVState env, int csrno,
	target_ulong new_value);
	typedef int (riscv_csr_op_fn)(CPURISCVState env, int csrno,
	target_ulong *ret_value, target_ulong new_value, target_ulong write_mask);

	typedef struct {
	riscv_csr_predicate_fn predicate;
	riscv_csr_read_fn read;
	riscv_csr_write_fn write;
	riscv_csr_op_fn op;
	} riscv_csr_operations;

	void riscv_get_csr_ops(int csrno, riscv_csr_operations *ops);
	void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops);

	void riscv_cpu_register_gdb_regs_for_features(CPUState *cs);

	typedef CPURISCVState CPUArchState;
	typedef RISCVCPU ArchCPU;

	#include "exec/cpu-all.h"

	#endif /* RISCV_CPU_H */