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qemu-e2k/target-mips/cpu.h
Aleksandar Markovic af39bc8c49 softfloat: Implement run-time-configurable meaning of signaling NaN bit 
This patch modifies SoftFloat library so that it can be configured in
run-time in relation to the meaning of signaling NaN bit, while, at the
same time, strictly preserving its behavior on all existing platforms.

Background:

In floating-point calculations, there is a need for denoting undefined or
unrepresentable values. This is achieved by defining certain floating-point
numerical values to be NaNs (which stands for "not a number"). For additional
reasons, virtually all modern floating-point unit implementations use two
kinds of NaNs: quiet and signaling. The binary representations of these two
kinds of NaNs, as a rule, differ only in one bit (that bit is, traditionally,
the first bit of mantissa).

Up to 2008, standards for floating-point did not specify all details about
binary representation of NaNs. More specifically, the meaning of the bit
that is used for distinguishing between signaling and quiet NaNs was not
strictly prescribed. (IEEE 754-2008 was the first floating-point standard
that defined that meaning clearly, see [1], p. 35) As a result, different
platforms took different approaches, and that presented considerable
challenge for multi-platform emulators like QEMU.

Mips platform represents the most complex case among QEMU-supported
platforms regarding signaling NaN bit. Up to the Release 6 of Mips
architecture, "1" in signaling NaN bit denoted signaling NaN, which is
opposite to IEEE 754-2008 standard. From Release 6 on, Mips architecture
adopted IEEE standard prescription, and "0" denotes signaling NaN. On top of
that, Mips architecture for SIMD (also known as MSA, or vector instructions)
also specifies signaling bit in accordance to IEEE standard. MSA unit can be
implemented with both pre-Release 6 and Release 6 main processor units.

QEMU uses SoftFloat library to implement various floating-point-related
instructions on all platforms. The current QEMU implementation allows for
defining meaning of signaling NaN bit during build time, and is implemented
via preprocessor macro called SNAN_BIT_IS_ONE.

On the other hand, the change in this patch enables SoftFloat library to be
configured in run-time. This configuration is meant to occur during CPU
initialization, at the moment when it is definitely known what desired
behavior for particular CPU (or any additional FPUs) is.

The change is implemented so that it is consistent with existing
implementation of similar cases. This means that structure float_status is
used for passing the information about desired signaling NaN bit on each
invocation of SoftFloat functions. The additional field in float_status is
called snan_bit_is_one, which supersedes macro SNAN_BIT_IS_ONE.

IMPORTANT:

This change is not meant to create any change in emulator behavior or
functionality on any platform. It just provides the means for SoftFloat
library to be used in a more flexible way - in other words, it will just
prepare SoftFloat library for usage related to Mips platform and its
specifics regarding signaling bit meaning, which is done in some of
subsequent patches from this series.

Further break down of changes:

  1) Added field snan_bit_is_one to the structure float_status, and
     correspondent setter function set_snan_bit_is_one().

  2) Constants <float16|float32|float64|floatx80|float128>_default_nan
     (used both internally and externally) converted to functions
     <float16|float32|float64|floatx80|float128>_default_nan(float_status*).
     This is necessary since they are dependent on signaling bit meaning.
     At the same time, for the sake of code cleanup and simplicity, constants
     <floatx80|float128>_default_nan_<low|high> (used only internally within
     SoftFloat library) are removed, as not needed.

  3) Added a float_status* argument to SoftFloat library functions
     XXX_is_quiet_nan(XXX a_), XXX_is_signaling_nan(XXX a_),
     XXX_maybe_silence_nan(XXX a_). This argument must be present in
     order to enable correct invocation of new version of functions
     XXX_default_nan(). (XXX is <float16|float32|float64|floatx80|float128>
     here)

  4) Updated code for all platforms to reflect changes in SoftFloat library.
     This change is twofolds: it includes modifications of SoftFloat library
     functions invocations, and an addition of invocation of function
     set_snan_bit_is_one() during CPU initialization, with arguments that
     are appropriate for each particular platform. It was established that
     all platforms zero their main CPU data structures, so snan_bit_is_one(0)
     in appropriate places is not added, as it is not needed.

[1] "IEEE Standard for Floating-Point Arithmetic",
    IEEE Computer Society, August 29, 2008.

Signed-off-by: Thomas Schwinge <thomas@codesourcery.com>
Signed-off-by: Maciej W. Rozycki <macro@codesourcery.com>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Tested-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Reviewed-by: Leon Alrae <leon.alrae@imgtec.com>
Tested-by: Leon Alrae <leon.alrae@imgtec.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[leon.alrae@imgtec.com:
 * cherry-picked 2 chunks from patch #2 to fix compilation warnings]
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
2016-06-24 13:40:37 +01:00

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#if !defined (__MIPS_CPU_H__)
#define __MIPS_CPU_H__
//#define DEBUG_OP
#define ALIGNED_ONLY
#define CPUArchState struct CPUMIPSState
#include "qemu-common.h"
#include "cpu-qom.h"
#include "mips-defs.h"
#include "exec/cpu-defs.h"
#include "fpu/softfloat.h"
struct CPUMIPSState;
typedef struct r4k_tlb_t r4k_tlb_t;
struct r4k_tlb_t {
target_ulong VPN;
uint32_t PageMask;
uint8_t ASID;
unsigned int G:1;
unsigned int C0:3;
unsigned int C1:3;
unsigned int V0:1;
unsigned int V1:1;
unsigned int D0:1;
unsigned int D1:1;
unsigned int XI0:1;
unsigned int XI1:1;
unsigned int RI0:1;
unsigned int RI1:1;
unsigned int EHINV:1;
uint64_t PFN[2];
};
#if !defined(CONFIG_USER_ONLY)
typedef struct CPUMIPSTLBContext CPUMIPSTLBContext;
struct CPUMIPSTLBContext {
uint32_t nb_tlb;
uint32_t tlb_in_use;
int (*map_address) (struct CPUMIPSState *env, hwaddr *physical, int *prot, target_ulong address, int rw, int access_type);
void (*helper_tlbwi)(struct CPUMIPSState *env);
void (*helper_tlbwr)(struct CPUMIPSState *env);
void (*helper_tlbp)(struct CPUMIPSState *env);
void (*helper_tlbr)(struct CPUMIPSState *env);
void (*helper_tlbinv)(struct CPUMIPSState *env);
void (*helper_tlbinvf)(struct CPUMIPSState *env);
union {
struct {
r4k_tlb_t tlb[MIPS_TLB_MAX];
} r4k;
} mmu;
};
#endif
/* MSA Context */
#define MSA_WRLEN (128)
enum CPUMIPSMSADataFormat {
DF_BYTE = 0,
DF_HALF,
DF_WORD,
DF_DOUBLE
};
typedef union wr_t wr_t;
union wr_t {
int8_t b[MSA_WRLEN/8];
int16_t h[MSA_WRLEN/16];
int32_t w[MSA_WRLEN/32];
int64_t d[MSA_WRLEN/64];
};
typedef union fpr_t fpr_t;
union fpr_t {
float64 fd; /* ieee double precision */
float32 fs[2];/* ieee single precision */
uint64_t d; /* binary double fixed-point */
uint32_t w[2]; /* binary single fixed-point */
/* FPU/MSA register mapping is not tested on big-endian hosts. */
wr_t wr; /* vector data */
};
/* define FP_ENDIAN_IDX to access the same location
* in the fpr_t union regardless of the host endianness
*/
#if defined(HOST_WORDS_BIGENDIAN)
# define FP_ENDIAN_IDX 1
#else
# define FP_ENDIAN_IDX 0
#endif
typedef struct CPUMIPSFPUContext CPUMIPSFPUContext;
struct CPUMIPSFPUContext {
/* Floating point registers */
fpr_t fpr[32];
float_status fp_status;
/* fpu implementation/revision register (fir) */
uint32_t fcr0;
#define FCR0_FREP 29
#define FCR0_UFRP 28
#define FCR0_HAS2008 23
#define FCR0_F64 22
#define FCR0_L 21
#define FCR0_W 20
#define FCR0_3D 19
#define FCR0_PS 18
#define FCR0_D 17
#define FCR0_S 16
#define FCR0_PRID 8
#define FCR0_REV 0
/* fcsr */
uint32_t fcr31;
#define FCR31_ABS2008 19
#define FCR31_NAN2008 18
#define SET_FP_COND(num,env) do { ((env).fcr31) |= ((num) ? (1 << ((num) + 24)) : (1 << 23)); } while(0)
#define CLEAR_FP_COND(num,env) do { ((env).fcr31) &= ~((num) ? (1 << ((num) + 24)) : (1 << 23)); } while(0)
#define GET_FP_COND(env) ((((env).fcr31 >> 24) & 0xfe) | (((env).fcr31 >> 23) & 0x1))
#define GET_FP_CAUSE(reg) (((reg) >> 12) & 0x3f)
#define GET_FP_ENABLE(reg) (((reg) >> 7) & 0x1f)
#define GET_FP_FLAGS(reg) (((reg) >> 2) & 0x1f)
#define SET_FP_CAUSE(reg,v) do { (reg) = ((reg) & ~(0x3f << 12)) | ((v & 0x3f) << 12); } while(0)
#define SET_FP_ENABLE(reg,v) do { (reg) = ((reg) & ~(0x1f << 7)) | ((v & 0x1f) << 7); } while(0)
#define SET_FP_FLAGS(reg,v) do { (reg) = ((reg) & ~(0x1f << 2)) | ((v & 0x1f) << 2); } while(0)
#define UPDATE_FP_FLAGS(reg,v) do { (reg) |= ((v & 0x1f) << 2); } while(0)
#define FP_INEXACT 1
#define FP_UNDERFLOW 2
#define FP_OVERFLOW 4
#define FP_DIV0 8
#define FP_INVALID 16
#define FP_UNIMPLEMENTED 32
};
#define NB_MMU_MODES 3
#define TARGET_INSN_START_EXTRA_WORDS 2
typedef struct CPUMIPSMVPContext CPUMIPSMVPContext;
struct CPUMIPSMVPContext {
int32_t CP0_MVPControl;
#define CP0MVPCo_CPA 3
#define CP0MVPCo_STLB 2
#define CP0MVPCo_VPC 1
#define CP0MVPCo_EVP 0
int32_t CP0_MVPConf0;
#define CP0MVPC0_M 31
#define CP0MVPC0_TLBS 29
#define CP0MVPC0_GS 28
#define CP0MVPC0_PCP 27
#define CP0MVPC0_PTLBE 16
#define CP0MVPC0_TCA 15
#define CP0MVPC0_PVPE 10
#define CP0MVPC0_PTC 0
int32_t CP0_MVPConf1;
#define CP0MVPC1_CIM 31
#define CP0MVPC1_CIF 30
#define CP0MVPC1_PCX 20
#define CP0MVPC1_PCP2 10
#define CP0MVPC1_PCP1 0
};
typedef struct mips_def_t mips_def_t;
#define MIPS_SHADOW_SET_MAX 16
#define MIPS_TC_MAX 5
#define MIPS_FPU_MAX 1
#define MIPS_DSP_ACC 4
#define MIPS_KSCRATCH_NUM 6
#define MIPS_MAAR_MAX 16 /* Must be an even number. */
typedef struct TCState TCState;
struct TCState {
target_ulong gpr[32];
target_ulong PC;
target_ulong HI[MIPS_DSP_ACC];
target_ulong LO[MIPS_DSP_ACC];
target_ulong ACX[MIPS_DSP_ACC];
target_ulong DSPControl;
int32_t CP0_TCStatus;
#define CP0TCSt_TCU3 31
#define CP0TCSt_TCU2 30
#define CP0TCSt_TCU1 29
#define CP0TCSt_TCU0 28
#define CP0TCSt_TMX 27
#define CP0TCSt_RNST 23
#define CP0TCSt_TDS 21
#define CP0TCSt_DT 20
#define CP0TCSt_DA 15
#define CP0TCSt_A 13
#define CP0TCSt_TKSU 11
#define CP0TCSt_IXMT 10
#define CP0TCSt_TASID 0
int32_t CP0_TCBind;
#define CP0TCBd_CurTC 21
#define CP0TCBd_TBE 17
#define CP0TCBd_CurVPE 0
target_ulong CP0_TCHalt;
target_ulong CP0_TCContext;
target_ulong CP0_TCSchedule;
target_ulong CP0_TCScheFBack;
int32_t CP0_Debug_tcstatus;
target_ulong CP0_UserLocal;
int32_t msacsr;
#define MSACSR_FS 24
#define MSACSR_FS_MASK (1 << MSACSR_FS)
#define MSACSR_NX 18
#define MSACSR_NX_MASK (1 << MSACSR_NX)
#define MSACSR_CEF 2
#define MSACSR_CEF_MASK (0xffff << MSACSR_CEF)
#define MSACSR_RM 0
#define MSACSR_RM_MASK (0x3 << MSACSR_RM)
#define MSACSR_MASK (MSACSR_RM_MASK | MSACSR_CEF_MASK | MSACSR_NX_MASK | \
MSACSR_FS_MASK)
float_status msa_fp_status;
};
typedef struct CPUMIPSState CPUMIPSState;
struct CPUMIPSState {
TCState active_tc;
CPUMIPSFPUContext active_fpu;
uint32_t current_tc;
uint32_t current_fpu;
uint32_t SEGBITS;
uint32_t PABITS;
#if defined(TARGET_MIPS64)
# define PABITS_BASE 36
#else
# define PABITS_BASE 32
#endif
target_ulong SEGMask;
uint64_t PAMask;
#define PAMASK_BASE ((1ULL << PABITS_BASE) - 1)
int32_t msair;
#define MSAIR_ProcID 8
#define MSAIR_Rev 0
int32_t CP0_Index;
/* CP0_MVP* are per MVP registers. */
int32_t CP0_VPControl;
#define CP0VPCtl_DIS 0
int32_t CP0_Random;
int32_t CP0_VPEControl;
#define CP0VPECo_YSI 21
#define CP0VPECo_GSI 20
#define CP0VPECo_EXCPT 16
#define CP0VPECo_TE 15
#define CP0VPECo_TargTC 0
int32_t CP0_VPEConf0;
#define CP0VPEC0_M 31
#define CP0VPEC0_XTC 21
#define CP0VPEC0_TCS 19
#define CP0VPEC0_SCS 18
#define CP0VPEC0_DSC 17
#define CP0VPEC0_ICS 16
#define CP0VPEC0_MVP 1
#define CP0VPEC0_VPA 0
int32_t CP0_VPEConf1;
#define CP0VPEC1_NCX 20
#define CP0VPEC1_NCP2 10
#define CP0VPEC1_NCP1 0
target_ulong CP0_YQMask;
target_ulong CP0_VPESchedule;
target_ulong CP0_VPEScheFBack;
int32_t CP0_VPEOpt;
#define CP0VPEOpt_IWX7 15
#define CP0VPEOpt_IWX6 14
#define CP0VPEOpt_IWX5 13
#define CP0VPEOpt_IWX4 12
#define CP0VPEOpt_IWX3 11
#define CP0VPEOpt_IWX2 10
#define CP0VPEOpt_IWX1 9
#define CP0VPEOpt_IWX0 8
#define CP0VPEOpt_DWX7 7
#define CP0VPEOpt_DWX6 6
#define CP0VPEOpt_DWX5 5
#define CP0VPEOpt_DWX4 4
#define CP0VPEOpt_DWX3 3
#define CP0VPEOpt_DWX2 2
#define CP0VPEOpt_DWX1 1
#define CP0VPEOpt_DWX0 0
uint64_t CP0_EntryLo0;
uint64_t CP0_EntryLo1;
#if defined(TARGET_MIPS64)
# define CP0EnLo_RI 63
# define CP0EnLo_XI 62
#else
# define CP0EnLo_RI 31
# define CP0EnLo_XI 30
#endif
int32_t CP0_GlobalNumber;
#define CP0GN_VPId 0
target_ulong CP0_Context;
target_ulong CP0_KScratch[MIPS_KSCRATCH_NUM];
int32_t CP0_PageMask;
int32_t CP0_PageGrain_rw_bitmask;
int32_t CP0_PageGrain;
#define CP0PG_RIE 31
#define CP0PG_XIE 30
#define CP0PG_ELPA 29
#define CP0PG_IEC 27
int32_t CP0_Wired;
int32_t CP0_SRSConf0_rw_bitmask;
int32_t CP0_SRSConf0;
#define CP0SRSC0_M 31
#define CP0SRSC0_SRS3 20
#define CP0SRSC0_SRS2 10
#define CP0SRSC0_SRS1 0
int32_t CP0_SRSConf1_rw_bitmask;
int32_t CP0_SRSConf1;
#define CP0SRSC1_M 31
#define CP0SRSC1_SRS6 20
#define CP0SRSC1_SRS5 10
#define CP0SRSC1_SRS4 0
int32_t CP0_SRSConf2_rw_bitmask;
int32_t CP0_SRSConf2;
#define CP0SRSC2_M 31
#define CP0SRSC2_SRS9 20
#define CP0SRSC2_SRS8 10
#define CP0SRSC2_SRS7 0
int32_t CP0_SRSConf3_rw_bitmask;
int32_t CP0_SRSConf3;
#define CP0SRSC3_M 31
#define CP0SRSC3_SRS12 20
#define CP0SRSC3_SRS11 10
#define CP0SRSC3_SRS10 0
int32_t CP0_SRSConf4_rw_bitmask;
int32_t CP0_SRSConf4;
#define CP0SRSC4_SRS15 20
#define CP0SRSC4_SRS14 10
#define CP0SRSC4_SRS13 0
int32_t CP0_HWREna;
target_ulong CP0_BadVAddr;
uint32_t CP0_BadInstr;
uint32_t CP0_BadInstrP;
int32_t CP0_Count;
target_ulong CP0_EntryHi;
#define CP0EnHi_EHINV 10
int32_t CP0_Compare;
int32_t CP0_Status;
#define CP0St_CU3 31
#define CP0St_CU2 30
#define CP0St_CU1 29
#define CP0St_CU0 28
#define CP0St_RP 27
#define CP0St_FR 26
#define CP0St_RE 25
#define CP0St_MX 24
#define CP0St_PX 23
#define CP0St_BEV 22
#define CP0St_TS 21
#define CP0St_SR 20
#define CP0St_NMI 19
#define CP0St_IM 8
#define CP0St_KX 7
#define CP0St_SX 6
#define CP0St_UX 5
#define CP0St_KSU 3
#define CP0St_ERL 2
#define CP0St_EXL 1
#define CP0St_IE 0
int32_t CP0_IntCtl;
#define CP0IntCtl_IPTI 29
#define CP0IntCtl_IPPCI 26
#define CP0IntCtl_VS 5
int32_t CP0_SRSCtl;
#define CP0SRSCtl_HSS 26
#define CP0SRSCtl_EICSS 18
#define CP0SRSCtl_ESS 12
#define CP0SRSCtl_PSS 6
#define CP0SRSCtl_CSS 0
int32_t CP0_SRSMap;
#define CP0SRSMap_SSV7 28
#define CP0SRSMap_SSV6 24
#define CP0SRSMap_SSV5 20
#define CP0SRSMap_SSV4 16
#define CP0SRSMap_SSV3 12
#define CP0SRSMap_SSV2 8
#define CP0SRSMap_SSV1 4
#define CP0SRSMap_SSV0 0
int32_t CP0_Cause;
#define CP0Ca_BD 31
#define CP0Ca_TI 30
#define CP0Ca_CE 28
#define CP0Ca_DC 27
#define CP0Ca_PCI 26
#define CP0Ca_IV 23
#define CP0Ca_WP 22
#define CP0Ca_IP 8
#define CP0Ca_IP_mask 0x0000FF00
#define CP0Ca_EC 2
target_ulong CP0_EPC;
int32_t CP0_PRid;
int32_t CP0_EBase;
target_ulong CP0_CMGCRBase;
int32_t CP0_Config0;
#define CP0C0_M 31
#define CP0C0_K23 28
#define CP0C0_KU 25
#define CP0C0_MDU 20
#define CP0C0_MM 18
#define CP0C0_BM 16
#define CP0C0_BE 15
#define CP0C0_AT 13
#define CP0C0_AR 10
#define CP0C0_MT 7
#define CP0C0_VI 3
#define CP0C0_K0 0
int32_t CP0_Config1;
#define CP0C1_M 31
#define CP0C1_MMU 25
#define CP0C1_IS 22
#define CP0C1_IL 19
#define CP0C1_IA 16
#define CP0C1_DS 13
#define CP0C1_DL 10
#define CP0C1_DA 7
#define CP0C1_C2 6
#define CP0C1_MD 5
#define CP0C1_PC 4
#define CP0C1_WR 3
#define CP0C1_CA 2
#define CP0C1_EP 1
#define CP0C1_FP 0
int32_t CP0_Config2;
#define CP0C2_M 31
#define CP0C2_TU 28
#define CP0C2_TS 24
#define CP0C2_TL 20
#define CP0C2_TA 16
#define CP0C2_SU 12
#define CP0C2_SS 8
#define CP0C2_SL 4
#define CP0C2_SA 0
int32_t CP0_Config3;
#define CP0C3_M 31
#define CP0C3_BPG 30
#define CP0C3_CMGCR 29
#define CP0C3_MSAP 28
#define CP0C3_BP 27
#define CP0C3_BI 26
#define CP0C3_IPLW 21
#define CP0C3_MMAR 18
#define CP0C3_MCU 17
#define CP0C3_ISA_ON_EXC 16
#define CP0C3_ISA 14
#define CP0C3_ULRI 13
#define CP0C3_RXI 12
#define CP0C3_DSP2P 11
#define CP0C3_DSPP 10
#define CP0C3_LPA 7
#define CP0C3_VEIC 6
#define CP0C3_VInt 5
#define CP0C3_SP 4
#define CP0C3_CDMM 3
#define CP0C3_MT 2
#define CP0C3_SM 1
#define CP0C3_TL 0
int32_t CP0_Config4;
int32_t CP0_Config4_rw_bitmask;
#define CP0C4_M 31
#define CP0C4_IE 29
#define CP0C4_KScrExist 16
#define CP0C4_MMUExtDef 14
#define CP0C4_FTLBPageSize 8
#define CP0C4_FTLBWays 4
#define CP0C4_FTLBSets 0
#define CP0C4_MMUSizeExt 0
int32_t CP0_Config5;
int32_t CP0_Config5_rw_bitmask;
#define CP0C5_M 31
#define CP0C5_K 30
#define CP0C5_CV 29
#define CP0C5_EVA 28
#define CP0C5_MSAEn 27
#define CP0C5_XNP 13
#define CP0C5_UFE 9
#define CP0C5_FRE 8
#define CP0C5_VP 7
#define CP0C5_SBRI 6
#define CP0C5_MVH 5
#define CP0C5_LLB 4
#define CP0C5_MRP 3
#define CP0C5_UFR 2
#define CP0C5_NFExists 0
int32_t CP0_Config6;
int32_t CP0_Config7;
uint64_t CP0_MAAR[MIPS_MAAR_MAX];
int32_t CP0_MAARI;
/* XXX: Maybe make LLAddr per-TC? */
uint64_t lladdr;
target_ulong llval;
target_ulong llnewval;
target_ulong llreg;
uint64_t CP0_LLAddr_rw_bitmask;
int CP0_LLAddr_shift;
target_ulong CP0_WatchLo[8];
int32_t CP0_WatchHi[8];
target_ulong CP0_XContext;
int32_t CP0_Framemask;
int32_t CP0_Debug;
#define CP0DB_DBD 31
#define CP0DB_DM 30
#define CP0DB_LSNM 28
#define CP0DB_Doze 27
#define CP0DB_Halt 26
#define CP0DB_CNT 25
#define CP0DB_IBEP 24
#define CP0DB_DBEP 21
#define CP0DB_IEXI 20
#define CP0DB_VER 15
#define CP0DB_DEC 10
#define CP0DB_SSt 8
#define CP0DB_DINT 5
#define CP0DB_DIB 4
#define CP0DB_DDBS 3
#define CP0DB_DDBL 2
#define CP0DB_DBp 1
#define CP0DB_DSS 0
target_ulong CP0_DEPC;
int32_t CP0_Performance0;
int32_t CP0_ErrCtl;
#define CP0EC_WST 29
#define CP0EC_SPR 28
#define CP0EC_ITC 26
uint64_t CP0_TagLo;
int32_t CP0_DataLo;
int32_t CP0_TagHi;
int32_t CP0_DataHi;
target_ulong CP0_ErrorEPC;
int32_t CP0_DESAVE;
/* We waste some space so we can handle shadow registers like TCs. */
TCState tcs[MIPS_SHADOW_SET_MAX];
CPUMIPSFPUContext fpus[MIPS_FPU_MAX];
/* QEMU */
int error_code;
#define EXCP_TLB_NOMATCH 0x1
#define EXCP_INST_NOTAVAIL 0x2 /* No valid instruction word for BadInstr */
uint32_t hflags; /* CPU State */
/* TMASK defines different execution modes */
#define MIPS_HFLAG_TMASK 0xF5807FF
#define MIPS_HFLAG_MODE 0x00007 /* execution modes */
/* The KSU flags must be the lowest bits in hflags. The flag order
must be the same as defined for CP0 Status. This allows to use
the bits as the value of mmu_idx. */
#define MIPS_HFLAG_KSU 0x00003 /* kernel/supervisor/user mode mask */
#define MIPS_HFLAG_UM 0x00002 /* user mode flag */
#define MIPS_HFLAG_SM 0x00001 /* supervisor mode flag */
#define MIPS_HFLAG_KM 0x00000 /* kernel mode flag */
#define MIPS_HFLAG_DM 0x00004 /* Debug mode */
#define MIPS_HFLAG_64 0x00008 /* 64-bit instructions enabled */
#define MIPS_HFLAG_CP0 0x00010 /* CP0 enabled */
#define MIPS_HFLAG_FPU 0x00020 /* FPU enabled */
#define MIPS_HFLAG_F64 0x00040 /* 64-bit FPU enabled */
/* True if the MIPS IV COP1X instructions can be used. This also
controls the non-COP1X instructions RECIP.S, RECIP.D, RSQRT.S
and RSQRT.D. */
#define MIPS_HFLAG_COP1X 0x00080 /* COP1X instructions enabled */
#define MIPS_HFLAG_RE 0x00100 /* Reversed endianness */
#define MIPS_HFLAG_AWRAP 0x00200 /* 32-bit compatibility address wrapping */
#define MIPS_HFLAG_M16 0x00400 /* MIPS16 mode flag */
#define MIPS_HFLAG_M16_SHIFT 10
/* If translation is interrupted between the branch instruction and
* the delay slot, record what type of branch it is so that we can
* resume translation properly. It might be possible to reduce
* this from three bits to two. */
#define MIPS_HFLAG_BMASK_BASE 0x803800
#define MIPS_HFLAG_B 0x00800 /* Unconditional branch */
#define MIPS_HFLAG_BC 0x01000 /* Conditional branch */
#define MIPS_HFLAG_BL 0x01800 /* Likely branch */
#define MIPS_HFLAG_BR 0x02000 /* branch to register (can't link TB) */
/* Extra flags about the current pending branch. */
#define MIPS_HFLAG_BMASK_EXT 0x7C000
#define MIPS_HFLAG_B16 0x04000 /* branch instruction was 16 bits */
#define MIPS_HFLAG_BDS16 0x08000 /* branch requires 16-bit delay slot */
#define MIPS_HFLAG_BDS32 0x10000 /* branch requires 32-bit delay slot */
#define MIPS_HFLAG_BDS_STRICT 0x20000 /* Strict delay slot size */
#define MIPS_HFLAG_BX 0x40000 /* branch exchanges execution mode */
#define MIPS_HFLAG_BMASK (MIPS_HFLAG_BMASK_BASE | MIPS_HFLAG_BMASK_EXT)
/* MIPS DSP resources access. */
#define MIPS_HFLAG_DSP 0x080000 /* Enable access to MIPS DSP resources. */
#define MIPS_HFLAG_DSPR2 0x100000 /* Enable access to MIPS DSPR2 resources. */
/* Extra flag about HWREna register. */
#define MIPS_HFLAG_HWRENA_ULR 0x200000 /* ULR bit from HWREna is set. */
#define MIPS_HFLAG_SBRI 0x400000 /* R6 SDBBP causes RI excpt. in user mode */
#define MIPS_HFLAG_FBNSLOT 0x800000 /* Forbidden slot */
#define MIPS_HFLAG_MSA 0x1000000
#define MIPS_HFLAG_FRE 0x2000000 /* FRE enabled */
#define MIPS_HFLAG_ELPA 0x4000000
#define MIPS_HFLAG_ITC_CACHE 0x8000000 /* CACHE instr. operates on ITC tag */
target_ulong btarget; /* Jump / branch target */
target_ulong bcond; /* Branch condition (if needed) */
int SYNCI_Step; /* Address step size for SYNCI */
int CCRes; /* Cycle count resolution/divisor */
uint32_t CP0_Status_rw_bitmask; /* Read/write bits in CP0_Status */
uint32_t CP0_TCStatus_rw_bitmask; /* Read/write bits in CP0_TCStatus */
int insn_flags; /* Supported instruction set */
CPU_COMMON
/* Fields from here on are preserved across CPU reset. */
CPUMIPSMVPContext *mvp;
#if !defined(CONFIG_USER_ONLY)
CPUMIPSTLBContext *tlb;
#endif
const mips_def_t *cpu_model;
void *irq[8];
QEMUTimer *timer; /* Internal timer */
MemoryRegion *itc_tag; /* ITC Configuration Tags */
};
/**
* MIPSCPU:
* @env: #CPUMIPSState
*
* A MIPS CPU.
*/
struct MIPSCPU {
/*< private >*/
CPUState parent_obj;
/*< public >*/
CPUMIPSState env;
};
static inline MIPSCPU *mips_env_get_cpu(CPUMIPSState *env)
{
return container_of(env, MIPSCPU, env);
}
#define ENV_GET_CPU(e) CPU(mips_env_get_cpu(e))
#define ENV_OFFSET offsetof(MIPSCPU, env)
#ifndef CONFIG_USER_ONLY
extern const struct VMStateDescription vmstate_mips_cpu;
#endif
void mips_cpu_do_interrupt(CPUState *cpu);
bool mips_cpu_exec_interrupt(CPUState *cpu, int int_req);
void mips_cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
int flags);
hwaddr mips_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
int mips_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
int mips_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
void mips_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
int is_write, int is_user, uintptr_t retaddr);
#if !defined(CONFIG_USER_ONLY)
int no_mmu_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
target_ulong address, int rw, int access_type);
int fixed_mmu_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
target_ulong address, int rw, int access_type);
int r4k_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
target_ulong address, int rw, int access_type);
void r4k_helper_tlbwi(CPUMIPSState *env);
void r4k_helper_tlbwr(CPUMIPSState *env);
void r4k_helper_tlbp(CPUMIPSState *env);
void r4k_helper_tlbr(CPUMIPSState *env);
void r4k_helper_tlbinv(CPUMIPSState *env);
void r4k_helper_tlbinvf(CPUMIPSState *env);
void mips_cpu_unassigned_access(CPUState *cpu, hwaddr addr,
bool is_write, bool is_exec, int unused,
unsigned size);
#endif
void mips_cpu_list (FILE *f, fprintf_function cpu_fprintf);
#define cpu_exec cpu_mips_exec
#define cpu_signal_handler cpu_mips_signal_handler
#define cpu_list mips_cpu_list
extern void cpu_wrdsp(uint32_t rs, uint32_t mask_num, CPUMIPSState *env);
extern uint32_t cpu_rddsp(uint32_t mask_num, CPUMIPSState *env);
/* MMU modes definitions. We carefully match the indices with our
hflags layout. */
#define MMU_MODE0_SUFFIX _kernel
#define MMU_MODE1_SUFFIX _super
#define MMU_MODE2_SUFFIX _user
#define MMU_USER_IDX 2
static inline int cpu_mmu_index (CPUMIPSState *env, bool ifetch)
{
return env->hflags & MIPS_HFLAG_KSU;
}
static inline bool cpu_mips_hw_interrupts_enabled(CPUMIPSState *env)
{
return (env->CP0_Status & (1 << CP0St_IE)) &&
!(env->CP0_Status & (1 << CP0St_EXL)) &&
!(env->CP0_Status & (1 << CP0St_ERL)) &&
!(env->hflags & MIPS_HFLAG_DM) &&
/* Note that the TCStatus IXMT field is initialized to zero,
and only MT capable cores can set it to one. So we don't
need to check for MT capabilities here. */
!(env->active_tc.CP0_TCStatus & (1 << CP0TCSt_IXMT));
}
/* Check if there is pending and not masked out interrupt */
static inline bool cpu_mips_hw_interrupts_pending(CPUMIPSState *env)
{
int32_t pending;
int32_t status;
bool r;
pending = env->CP0_Cause & CP0Ca_IP_mask;
status = env->CP0_Status & CP0Ca_IP_mask;
if (env->CP0_Config3 & (1 << CP0C3_VEIC)) {
/* A MIPS configured with a vectorizing external interrupt controller
will feed a vector into the Cause pending lines. The core treats
the status lines as a vector level, not as indiviual masks. */
r = pending > status;
} else {
/* A MIPS configured with compatibility or VInt (Vectored Interrupts)
treats the pending lines as individual interrupt lines, the status
lines are individual masks. */
r = (pending & status) != 0;
}
return r;
}
#include "exec/cpu-all.h"
/* Memory access type :
* may be needed for precise access rights control and precise exceptions.
*/
enum {
/* 1 bit to define user level / supervisor access */
ACCESS_USER = 0x00,
ACCESS_SUPER = 0x01,
/* 1 bit to indicate direction */
ACCESS_STORE = 0x02,
/* Type of instruction that generated the access */
ACCESS_CODE = 0x10, /* Code fetch access */
ACCESS_INT = 0x20, /* Integer load/store access */
ACCESS_FLOAT = 0x30, /* floating point load/store access */
};
/* Exceptions */
enum {
EXCP_NONE = -1,
EXCP_RESET = 0,
EXCP_SRESET,
EXCP_DSS,
EXCP_DINT,
EXCP_DDBL,
EXCP_DDBS,
EXCP_NMI,
EXCP_MCHECK,
EXCP_EXT_INTERRUPT, /* 8 */
EXCP_DFWATCH,
EXCP_DIB,
EXCP_IWATCH,
EXCP_AdEL,
EXCP_AdES,
EXCP_TLBF,
EXCP_IBE,
EXCP_DBp, /* 16 */
EXCP_SYSCALL,
EXCP_BREAK,
EXCP_CpU,
EXCP_RI,
EXCP_OVERFLOW,
EXCP_TRAP,
EXCP_FPE,
EXCP_DWATCH, /* 24 */
EXCP_LTLBL,
EXCP_TLBL,
EXCP_TLBS,
EXCP_DBE,
EXCP_THREAD,
EXCP_MDMX,
EXCP_C2E,
EXCP_CACHE, /* 32 */
EXCP_DSPDIS,
EXCP_MSADIS,
EXCP_MSAFPE,
EXCP_TLBXI,
EXCP_TLBRI,
EXCP_LAST = EXCP_TLBRI,
};
/* Dummy exception for conditional stores. */
#define EXCP_SC 0x100
/*
* This is an interrnally generated WAKE request line.
* It is driven by the CPU itself. Raised when the MT
* block wants to wake a VPE from an inactive state and
* cleared when VPE goes from active to inactive.
*/
#define CPU_INTERRUPT_WAKE CPU_INTERRUPT_TGT_INT_0
int cpu_mips_exec(CPUState *cpu);
void mips_tcg_init(void);
MIPSCPU *cpu_mips_init(const char *cpu_model);
int cpu_mips_signal_handler(int host_signum, void *pinfo, void *puc);
#define cpu_init(cpu_model) CPU(cpu_mips_init(cpu_model))
bool cpu_supports_cps_smp(const char *cpu_model);
/* TODO QOM'ify CPU reset and remove */
void cpu_state_reset(CPUMIPSState *s);
/* mips_timer.c */
uint32_t cpu_mips_get_random (CPUMIPSState *env);
uint32_t cpu_mips_get_count (CPUMIPSState *env);
void cpu_mips_store_count (CPUMIPSState *env, uint32_t value);
void cpu_mips_store_compare (CPUMIPSState *env, uint32_t value);
void cpu_mips_start_count(CPUMIPSState *env);
void cpu_mips_stop_count(CPUMIPSState *env);
/* mips_int.c */
void cpu_mips_soft_irq(CPUMIPSState *env, int irq, int level);
/* helper.c */
int mips_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int rw,
int mmu_idx);
/* op_helper.c */
uint32_t float_class_s(uint32_t arg, float_status *fst);
uint64_t float_class_d(uint64_t arg, float_status *fst);
#if !defined(CONFIG_USER_ONLY)
void r4k_invalidate_tlb (CPUMIPSState *env, int idx, int use_extra);
hwaddr cpu_mips_translate_address (CPUMIPSState *env, target_ulong address,
int rw);
#endif
target_ulong exception_resume_pc (CPUMIPSState *env);
/* op_helper.c */
extern unsigned int ieee_rm[];
int ieee_ex_to_mips(int xcpt);
static inline void restore_rounding_mode(CPUMIPSState *env)
{
set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3],
&env->active_fpu.fp_status);
}
static inline void restore_flush_mode(CPUMIPSState *env)
{
set_flush_to_zero((env->active_fpu.fcr31 & (1 << 24)) != 0,
&env->active_fpu.fp_status);
}
static inline void restore_fp_status(CPUMIPSState *env)
{
restore_rounding_mode(env);
restore_flush_mode(env);
}
static inline void restore_msa_fp_status(CPUMIPSState *env)
{
float_status *status = &env->active_tc.msa_fp_status;
int rounding_mode = (env->active_tc.msacsr & MSACSR_RM_MASK) >> MSACSR_RM;
bool flush_to_zero = (env->active_tc.msacsr & MSACSR_FS_MASK) != 0;
set_float_rounding_mode(ieee_rm[rounding_mode], status);
set_flush_to_zero(flush_to_zero, status);
set_flush_inputs_to_zero(flush_to_zero, status);
}
static inline void restore_pamask(CPUMIPSState *env)
{
if (env->hflags & MIPS_HFLAG_ELPA) {
env->PAMask = (1ULL << env->PABITS) - 1;
} else {
env->PAMask = PAMASK_BASE;
}
}
static inline void cpu_get_tb_cpu_state(CPUMIPSState *env, target_ulong *pc,
target_ulong *cs_base, uint32_t *flags)
{
*pc = env->active_tc.PC;
*cs_base = 0;
*flags = env->hflags & (MIPS_HFLAG_TMASK | MIPS_HFLAG_BMASK |
MIPS_HFLAG_HWRENA_ULR);
}
static inline int mips_vpe_active(CPUMIPSState *env)
{
int active = 1;
/* Check that the VPE is enabled. */
if (!(env->mvp->CP0_MVPControl & (1 << CP0MVPCo_EVP))) {
active = 0;
}
/* Check that the VPE is activated. */
if (!(env->CP0_VPEConf0 & (1 << CP0VPEC0_VPA))) {
active = 0;
}
/* Now verify that there are active thread contexts in the VPE.
This assumes the CPU model will internally reschedule threads
if the active one goes to sleep. If there are no threads available
the active one will be in a sleeping state, and we can turn off
the entire VPE. */
if (!(env->active_tc.CP0_TCStatus & (1 << CP0TCSt_A))) {
/* TC is not activated. */
active = 0;
}
if (env->active_tc.CP0_TCHalt & 1) {
/* TC is in halt state. */
active = 0;
}
return active;
}
static inline int mips_vp_active(CPUMIPSState *env)
{
CPUState *other_cs = first_cpu;
/* Check if the VP disabled other VPs (which means the VP is enabled) */
if ((env->CP0_VPControl >> CP0VPCtl_DIS) & 1) {
return 1;
}
/* Check if the virtual processor is disabled due to a DVP */
CPU_FOREACH(other_cs) {
MIPSCPU *other_cpu = MIPS_CPU(other_cs);
if ((&other_cpu->env != env) &&
((other_cpu->env.CP0_VPControl >> CP0VPCtl_DIS) & 1)) {
return 0;
}
}
return 1;
}
static inline void compute_hflags(CPUMIPSState *env)
{
env->hflags &= ~(MIPS_HFLAG_COP1X | MIPS_HFLAG_64 | MIPS_HFLAG_CP0 |
MIPS_HFLAG_F64 | MIPS_HFLAG_FPU | MIPS_HFLAG_KSU |
MIPS_HFLAG_AWRAP | MIPS_HFLAG_DSP | MIPS_HFLAG_DSPR2 |
MIPS_HFLAG_SBRI | MIPS_HFLAG_MSA | MIPS_HFLAG_FRE |
MIPS_HFLAG_ELPA);
if (!(env->CP0_Status & (1 << CP0St_EXL)) &&
!(env->CP0_Status & (1 << CP0St_ERL)) &&
!(env->hflags & MIPS_HFLAG_DM)) {
env->hflags |= (env->CP0_Status >> CP0St_KSU) & MIPS_HFLAG_KSU;
}
#if defined(TARGET_MIPS64)
if ((env->insn_flags & ISA_MIPS3) &&
(((env->hflags & MIPS_HFLAG_KSU) != MIPS_HFLAG_UM) ||
(env->CP0_Status & (1 << CP0St_PX)) ||
(env->CP0_Status & (1 << CP0St_UX)))) {
env->hflags |= MIPS_HFLAG_64;
}
if (!(env->insn_flags & ISA_MIPS3)) {
env->hflags |= MIPS_HFLAG_AWRAP;
} else if (((env->hflags & MIPS_HFLAG_KSU) == MIPS_HFLAG_UM) &&
!(env->CP0_Status & (1 << CP0St_UX))) {
env->hflags |= MIPS_HFLAG_AWRAP;
} else if (env->insn_flags & ISA_MIPS64R6) {
/* Address wrapping for Supervisor and Kernel is specified in R6 */
if ((((env->hflags & MIPS_HFLAG_KSU) == MIPS_HFLAG_SM) &&
!(env->CP0_Status & (1 << CP0St_SX))) ||
(((env->hflags & MIPS_HFLAG_KSU) == MIPS_HFLAG_KM) &&
!(env->CP0_Status & (1 << CP0St_KX)))) {
env->hflags |= MIPS_HFLAG_AWRAP;
}
}
#endif
if (((env->CP0_Status & (1 << CP0St_CU0)) &&
!(env->insn_flags & ISA_MIPS32R6)) ||
!(env->hflags & MIPS_HFLAG_KSU)) {
env->hflags |= MIPS_HFLAG_CP0;
}
if (env->CP0_Status & (1 << CP0St_CU1)) {
env->hflags |= MIPS_HFLAG_FPU;
}
if (env->CP0_Status & (1 << CP0St_FR)) {
env->hflags |= MIPS_HFLAG_F64;
}
if (((env->hflags & MIPS_HFLAG_KSU) != MIPS_HFLAG_KM) &&
(env->CP0_Config5 & (1 << CP0C5_SBRI))) {
env->hflags |= MIPS_HFLAG_SBRI;
}
if (env->insn_flags & ASE_DSPR2) {
/* Enables access MIPS DSP resources, now our cpu is DSP ASER2,
so enable to access DSPR2 resources. */
if (env->CP0_Status & (1 << CP0St_MX)) {
env->hflags |= MIPS_HFLAG_DSP | MIPS_HFLAG_DSPR2;
}
} else if (env->insn_flags & ASE_DSP) {
/* Enables access MIPS DSP resources, now our cpu is DSP ASE,
so enable to access DSP resources. */
if (env->CP0_Status & (1 << CP0St_MX)) {
env->hflags |= MIPS_HFLAG_DSP;
}
}
if (env->insn_flags & ISA_MIPS32R2) {
if (env->active_fpu.fcr0 & (1 << FCR0_F64)) {
env->hflags |= MIPS_HFLAG_COP1X;
}
} else if (env->insn_flags & ISA_MIPS32) {
if (env->hflags & MIPS_HFLAG_64) {
env->hflags |= MIPS_HFLAG_COP1X;
}
} else if (env->insn_flags & ISA_MIPS4) {
/* All supported MIPS IV CPUs use the XX (CU3) to enable
and disable the MIPS IV extensions to the MIPS III ISA.
Some other MIPS IV CPUs ignore the bit, so the check here
would be too restrictive for them. */
if (env->CP0_Status & (1U << CP0St_CU3)) {
env->hflags |= MIPS_HFLAG_COP1X;
}
}
if (env->insn_flags & ASE_MSA) {
if (env->CP0_Config5 & (1 << CP0C5_MSAEn)) {
env->hflags |= MIPS_HFLAG_MSA;
}
}
if (env->active_fpu.fcr0 & (1 << FCR0_FREP)) {
if (env->CP0_Config5 & (1 << CP0C5_FRE)) {
env->hflags |= MIPS_HFLAG_FRE;
}
}
if (env->CP0_Config3 & (1 << CP0C3_LPA)) {
if (env->CP0_PageGrain & (1 << CP0PG_ELPA)) {
env->hflags |= MIPS_HFLAG_ELPA;
}
}
}
void cpu_mips_tlb_flush(CPUMIPSState *env, int flush_global);
void sync_c0_status(CPUMIPSState *env, CPUMIPSState *cpu, int tc);
void cpu_mips_store_status(CPUMIPSState *env, target_ulong val);
void cpu_mips_store_cause(CPUMIPSState *env, target_ulong val);
void QEMU_NORETURN do_raise_exception_err(CPUMIPSState *env, uint32_t exception,
int error_code, uintptr_t pc);
static inline void QEMU_NORETURN do_raise_exception(CPUMIPSState *env,
uint32_t exception,
uintptr_t pc)
{
do_raise_exception_err(env, exception, 0, pc);
}
#endif /* !defined (__MIPS_CPU_H__) */
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