diff options
| author | Leon Alrae <leon.alrae@imgtec.com> | 2015-04-21 16:06:28 +0100 |
|---|---|---|
| committer | Leon Alrae <leon.alrae@imgtec.com> | 2015-06-11 10:13:28 +0100 |
| commit | 7c979afd11b09a16634699dd6344e3ba10c9677e (patch) | |
| tree | 2175a47d3d9f5a95406887a1b0e17c3c5c00b9d6 /target-mips/cpu.h | |
| parent | eab9944c7801525737626fa45cddaf00932dd2c8 (diff) | |
target-mips: add Config5.FRE support allowing Status.FR=0 emulation
This relatively small architectural feature adds the following:
FIR.FREP: Read-only. If FREP=1, then Config5.FRE and Config5.UFE are
available.
Config5.FRE: When enabled all single-precision FP arithmetic instructions,
LWC1/LWXC1/MTC1, SWC1/SWXC1/MFC1 cause a Reserved Instructions
exception.
Config5.UFE: Allows user to write/read Config5.FRE using CTC1/CFC1
instructions.
Enable the feature in MIPS64R6-generic CPU.
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Diffstat (limited to 'target-mips/cpu.h')
| -rw-r--r-- | target-mips/cpu.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/target-mips/cpu.h b/target-mips/cpu.h index f9d2b4c5af..03eb888361 100644 --- a/target-mips/cpu.h +++ b/target-mips/cpu.h @@ -100,6 +100,7 @@ struct CPUMIPSFPUContext { float_status fp_status; /* fpu implementation/revision register (fir) */ uint32_t fcr0; +#define FCR0_FREP 29 #define FCR0_UFRP 28 #define FCR0_F64 22 #define FCR0_L 21 @@ -462,6 +463,8 @@ struct CPUMIPSState { #define CP0C5_CV 29 #define CP0C5_EVA 28 #define CP0C5_MSAEn 27 +#define CP0C5_UFE 9 +#define CP0C5_FRE 8 #define CP0C5_SBRI 6 #define CP0C5_UFR 2 #define CP0C5_NFExists 0 @@ -514,7 +517,7 @@ struct CPUMIPSState { #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 0x15807FF +#define MIPS_HFLAG_TMASK 0x35807FF #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 @@ -561,6 +564,7 @@ struct CPUMIPSState { #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 */ target_ulong btarget; /* Jump / branch target */ target_ulong bcond; /* Branch condition (if needed) */ @@ -843,7 +847,7 @@ 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_SBRI | MIPS_HFLAG_MSA | MIPS_HFLAG_FRE); if (!(env->CP0_Status & (1 << CP0St_EXL)) && !(env->CP0_Status & (1 << CP0St_ERL)) && !(env->hflags & MIPS_HFLAG_DM)) { @@ -924,6 +928,11 @@ static inline void compute_hflags(CPUMIPSState *env) 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; + } + } } #ifndef CONFIG_USER_ONLY |