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qemu-e2k/target/openrisc/cpu.h
Richard Henderson 6597c28d61 target/openrisc: Optimize for r0 being zero 
The HW does not special-case r0, but the ABI specifies that r0 should
contain 0.  If we expose this fact to the optimizer, we can simplify
a lot of the generated code.  We must of course verify that r0==0, but
that is trivial to do with a TB flag.

Signed-off-by: Richard Henderson <rth@twiddle.net>
2017-02-14 08:15:00 +11:00

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/*
* OpenRISC virtual CPU header.
*
* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
*
* 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/>.
*/
#ifndef OPENRISC_CPU_H
#define OPENRISC_CPU_H
#define TARGET_LONG_BITS 32
#define CPUArchState struct CPUOpenRISCState
/* cpu_openrisc_map_address_* in CPUOpenRISCTLBContext need this decl. */
struct OpenRISCCPU;
#include "qemu-common.h"
#include "exec/cpu-defs.h"
#include "fpu/softfloat.h"
#include "qom/cpu.h"
#define TYPE_OPENRISC_CPU "or1k-cpu"
#define OPENRISC_CPU_CLASS(klass) \
OBJECT_CLASS_CHECK(OpenRISCCPUClass, (klass), TYPE_OPENRISC_CPU)
#define OPENRISC_CPU(obj) \
OBJECT_CHECK(OpenRISCCPU, (obj), TYPE_OPENRISC_CPU)
#define OPENRISC_CPU_GET_CLASS(obj) \
OBJECT_GET_CLASS(OpenRISCCPUClass, (obj), TYPE_OPENRISC_CPU)
/**
* OpenRISCCPUClass:
* @parent_realize: The parent class' realize handler.
* @parent_reset: The parent class' reset handler.
*
* A OpenRISC CPU model.
*/
typedef struct OpenRISCCPUClass {
/*< private >*/
CPUClass parent_class;
/*< public >*/
DeviceRealize parent_realize;
void (*parent_reset)(CPUState *cpu);
} OpenRISCCPUClass;
#define NB_MMU_MODES 3
#define TARGET_INSN_START_EXTRA_WORDS 1
enum {
MMU_NOMMU_IDX = 0,
MMU_SUPERVISOR_IDX = 1,
MMU_USER_IDX = 2,
};
#define TARGET_PAGE_BITS 13
#define TARGET_PHYS_ADDR_SPACE_BITS 32
#define TARGET_VIRT_ADDR_SPACE_BITS 32
#define SET_FP_CAUSE(reg, v) do {\
(reg) = ((reg) & ~(0x3f << 12)) | \
((v & 0x3f) << 12);\
} while (0)
#define GET_FP_ENABLE(reg) (((reg) >> 7) & 0x1f)
#define UPDATE_FP_FLAGS(reg, v) do {\
(reg) |= ((v & 0x1f) << 2);\
} while (0)
/* Version Register */
#define SPR_VR 0xFFFF003F
/* Interrupt */
#define NR_IRQS 32
/* Unit presece register */
enum {
UPR_UP = (1 << 0),
UPR_DCP = (1 << 1),
UPR_ICP = (1 << 2),
UPR_DMP = (1 << 3),
UPR_IMP = (1 << 4),
UPR_MP = (1 << 5),
UPR_DUP = (1 << 6),
UPR_PCUR = (1 << 7),
UPR_PMP = (1 << 8),
UPR_PICP = (1 << 9),
UPR_TTP = (1 << 10),
UPR_CUP = (255 << 24),
};
/* CPU configure register */
enum {
CPUCFGR_NSGF = (15 << 0),
CPUCFGR_CGF = (1 << 4),
CPUCFGR_OB32S = (1 << 5),
CPUCFGR_OB64S = (1 << 6),
CPUCFGR_OF32S = (1 << 7),
CPUCFGR_OF64S = (1 << 8),
CPUCFGR_OV64S = (1 << 9),
};
/* DMMU configure register */
enum {
DMMUCFGR_NTW = (3 << 0),
DMMUCFGR_NTS = (7 << 2),
DMMUCFGR_NAE = (7 << 5),
DMMUCFGR_CRI = (1 << 8),
DMMUCFGR_PRI = (1 << 9),
DMMUCFGR_TEIRI = (1 << 10),
DMMUCFGR_HTR = (1 << 11),
};
/* IMMU configure register */
enum {
IMMUCFGR_NTW = (3 << 0),
IMMUCFGR_NTS = (7 << 2),
IMMUCFGR_NAE = (7 << 5),
IMMUCFGR_CRI = (1 << 8),
IMMUCFGR_PRI = (1 << 9),
IMMUCFGR_TEIRI = (1 << 10),
IMMUCFGR_HTR = (1 << 11),
};
/* Float point control status register */
enum {
FPCSR_FPEE = 1,
FPCSR_RM = (3 << 1),
FPCSR_OVF = (1 << 3),
FPCSR_UNF = (1 << 4),
FPCSR_SNF = (1 << 5),
FPCSR_QNF = (1 << 6),
FPCSR_ZF = (1 << 7),
FPCSR_IXF = (1 << 8),
FPCSR_IVF = (1 << 9),
FPCSR_INF = (1 << 10),
FPCSR_DZF = (1 << 11),
};
/* Exceptions indices */
enum {
EXCP_RESET = 0x1,
EXCP_BUSERR = 0x2,
EXCP_DPF = 0x3,
EXCP_IPF = 0x4,
EXCP_TICK = 0x5,
EXCP_ALIGN = 0x6,
EXCP_ILLEGAL = 0x7,
EXCP_INT = 0x8,
EXCP_DTLBMISS = 0x9,
EXCP_ITLBMISS = 0xa,
EXCP_RANGE = 0xb,
EXCP_SYSCALL = 0xc,
EXCP_FPE = 0xd,
EXCP_TRAP = 0xe,
EXCP_NR,
};
/* Supervisor register */
enum {
SR_SM = (1 << 0),
SR_TEE = (1 << 1),
SR_IEE = (1 << 2),
SR_DCE = (1 << 3),
SR_ICE = (1 << 4),
SR_DME = (1 << 5),
SR_IME = (1 << 6),
SR_LEE = (1 << 7),
SR_CE = (1 << 8),
SR_F = (1 << 9),
SR_CY = (1 << 10),
SR_OV = (1 << 11),
SR_OVE = (1 << 12),
SR_DSX = (1 << 13),
SR_EPH = (1 << 14),
SR_FO = (1 << 15),
SR_SUMRA = (1 << 16),
SR_SCE = (1 << 17),
};
/* OpenRISC Hardware Capabilities */
enum {
OPENRISC_FEATURE_NSGF = (15 << 0),
OPENRISC_FEATURE_CGF = (1 << 4),
OPENRISC_FEATURE_OB32S = (1 << 5),
OPENRISC_FEATURE_OB64S = (1 << 6),
OPENRISC_FEATURE_OF32S = (1 << 7),
OPENRISC_FEATURE_OF64S = (1 << 8),
OPENRISC_FEATURE_OV64S = (1 << 9),
};
/* Tick Timer Mode Register */
enum {
TTMR_TP = (0xfffffff),
TTMR_IP = (1 << 28),
TTMR_IE = (1 << 29),
TTMR_M = (3 << 30),
};
/* Timer Mode */
enum {
TIMER_NONE = (0 << 30),
TIMER_INTR = (1 << 30),
TIMER_SHOT = (2 << 30),
TIMER_CONT = (3 << 30),
};
/* TLB size */
enum {
DTLB_WAYS = 1,
DTLB_SIZE = 64,
DTLB_MASK = (DTLB_SIZE-1),
ITLB_WAYS = 1,
ITLB_SIZE = 64,
ITLB_MASK = (ITLB_SIZE-1),
};
/* TLB prot */
enum {
URE = (1 << 6),
UWE = (1 << 7),
SRE = (1 << 8),
SWE = (1 << 9),
SXE = (1 << 6),
UXE = (1 << 7),
};
/* check if tlb available */
enum {
TLBRET_INVALID = -3,
TLBRET_NOMATCH = -2,
TLBRET_BADADDR = -1,
TLBRET_MATCH = 0
};
typedef struct OpenRISCTLBEntry {
uint32_t mr;
uint32_t tr;
} OpenRISCTLBEntry;
#ifndef CONFIG_USER_ONLY
typedef struct CPUOpenRISCTLBContext {
OpenRISCTLBEntry itlb[ITLB_WAYS][ITLB_SIZE];
OpenRISCTLBEntry dtlb[DTLB_WAYS][DTLB_SIZE];
int (*cpu_openrisc_map_address_code)(struct OpenRISCCPU *cpu,
hwaddr *physical,
int *prot,
target_ulong address, int rw);
int (*cpu_openrisc_map_address_data)(struct OpenRISCCPU *cpu,
hwaddr *physical,
int *prot,
target_ulong address, int rw);
} CPUOpenRISCTLBContext;
#endif
typedef struct CPUOpenRISCState {
target_ulong gpr[32]; /* General registers */
target_ulong pc; /* Program counter */
target_ulong ppc; /* Prev PC */
target_ulong jmp_pc; /* Jump PC */
uint64_t mac; /* Multiply registers MACHI:MACLO */
target_ulong epcr; /* Exception PC register */
target_ulong eear; /* Exception EA register */
target_ulong sr_f; /* the SR_F bit, values 0, 1. */
target_ulong sr_cy; /* the SR_CY bit, values 0, 1. */
target_long sr_ov; /* the SR_OV bit (in the sign bit only) */
uint32_t sr; /* Supervisor register, without SR_{F,CY,OV} */
uint32_t vr; /* Version register */
uint32_t upr; /* Unit presence register */
uint32_t cpucfgr; /* CPU configure register */
uint32_t dmmucfgr; /* DMMU configure register */
uint32_t immucfgr; /* IMMU configure register */
uint32_t esr; /* Exception supervisor register */
uint32_t fpcsr; /* Float register */
float_status fp_status;
target_ulong lock_addr;
target_ulong lock_value;
uint32_t dflag; /* In delay slot (boolean) */
/* Fields up to this point are cleared by a CPU reset */
struct {} end_reset_fields;
CPU_COMMON
/* Fields from here on are preserved across CPU reset. */
#ifndef CONFIG_USER_ONLY
CPUOpenRISCTLBContext * tlb;
QEMUTimer *timer;
uint32_t ttmr; /* Timer tick mode register */
uint32_t ttcr; /* Timer tick count register */
uint32_t picmr; /* Interrupt mask register */
uint32_t picsr; /* Interrupt contrl register*/
#endif
void *irq[32]; /* Interrupt irq input */
} CPUOpenRISCState;
/**
* OpenRISCCPU:
* @env: #CPUOpenRISCState
*
* A OpenRISC CPU.
*/
typedef struct OpenRISCCPU {
/*< private >*/
CPUState parent_obj;
/*< public >*/
CPUOpenRISCState env;
uint32_t feature; /* CPU Capabilities */
} OpenRISCCPU;
static inline OpenRISCCPU *openrisc_env_get_cpu(CPUOpenRISCState *env)
{
return container_of(env, OpenRISCCPU, env);
}
#define ENV_GET_CPU(e) CPU(openrisc_env_get_cpu(e))
#define ENV_OFFSET offsetof(OpenRISCCPU, env)
OpenRISCCPU *cpu_openrisc_init(const char *cpu_model);
void cpu_openrisc_list(FILE *f, fprintf_function cpu_fprintf);
void openrisc_cpu_do_interrupt(CPUState *cpu);
bool openrisc_cpu_exec_interrupt(CPUState *cpu, int int_req);
void openrisc_cpu_dump_state(CPUState *cpu, FILE *f,
fprintf_function cpu_fprintf, int flags);
hwaddr openrisc_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
int openrisc_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
int openrisc_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
void openrisc_translate_init(void);
int openrisc_cpu_handle_mmu_fault(CPUState *cpu, vaddr address,
int rw, int mmu_idx);
int cpu_openrisc_signal_handler(int host_signum, void *pinfo, void *puc);
#define cpu_list cpu_openrisc_list
#define cpu_signal_handler cpu_openrisc_signal_handler
#ifndef CONFIG_USER_ONLY
extern const struct VMStateDescription vmstate_openrisc_cpu;
/* hw/openrisc_pic.c */
void cpu_openrisc_pic_init(OpenRISCCPU *cpu);
/* hw/openrisc_timer.c */
void cpu_openrisc_clock_init(OpenRISCCPU *cpu);
void cpu_openrisc_count_update(OpenRISCCPU *cpu);
void cpu_openrisc_timer_update(OpenRISCCPU *cpu);
void cpu_openrisc_count_start(OpenRISCCPU *cpu);
void cpu_openrisc_count_stop(OpenRISCCPU *cpu);
void cpu_openrisc_mmu_init(OpenRISCCPU *cpu);
int cpu_openrisc_get_phys_nommu(OpenRISCCPU *cpu,
hwaddr *physical,
int *prot, target_ulong address, int rw);
int cpu_openrisc_get_phys_code(OpenRISCCPU *cpu,
hwaddr *physical,
int *prot, target_ulong address, int rw);
int cpu_openrisc_get_phys_data(OpenRISCCPU *cpu,
hwaddr *physical,
int *prot, target_ulong address, int rw);
#endif
#define cpu_init(cpu_model) CPU(cpu_openrisc_init(cpu_model))
#include "exec/cpu-all.h"
#define TB_FLAGS_DFLAG 1
#define TB_FLAGS_R0_0 2
#define TB_FLAGS_OVE SR_OVE
static inline void cpu_get_tb_cpu_state(CPUOpenRISCState *env,
target_ulong *pc,
target_ulong *cs_base, uint32_t *flags)
{
*pc = env->pc;
*cs_base = 0;
*flags = (env->dflag
| (env->gpr[0] == 0 ? TB_FLAGS_R0_0 : 0)
| (env->sr & SR_OVE));
}
static inline int cpu_mmu_index(CPUOpenRISCState *env, bool ifetch)
{
if (!(env->sr & SR_IME)) {
return MMU_NOMMU_IDX;
}
return (env->sr & SR_SM) == 0 ? MMU_USER_IDX : MMU_SUPERVISOR_IDX;
}
static inline uint32_t cpu_get_sr(const CPUOpenRISCState *env)
{
return (env->sr
+ env->sr_f * SR_F
+ env->sr_cy * SR_CY
+ (env->sr_ov < 0) * SR_OV);
}
static inline void cpu_set_sr(CPUOpenRISCState *env, uint32_t val)
{
env->sr_f = (val & SR_F) != 0;
env->sr_cy = (val & SR_CY) != 0;
env->sr_ov = (val & SR_OV ? -1 : 0);
env->sr = (val & ~(SR_F | SR_CY | SR_OV)) | SR_FO;
}
#define CPU_INTERRUPT_TIMER CPU_INTERRUPT_TGT_INT_0
#endif /* OPENRISC_CPU_H */
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