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target-mips: add Config5.FRE support allowing Status.FR=0 emulation

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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>
This commit is contained in:
Leon Alrae
2015-06-11 10:13:28 +01:00
parent eab9944c78
commit 7c979afd11
4 changed files with 208 additions and 156 deletions
Download Patch File Download Diff File Expand all files Collapse all files
target-mips/cpu.h
+11 -2
View File
@@ -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
target-mips/op_helper.c
+34
View File
@@ -2303,6 +2303,16 @@ target_ulong helper_cfc1(CPUMIPSState *env, uint32_t reg)
}
}
break;
case 5:
/* FRE Support - read Config5.FRE bit */
if (env->active_fpu.fcr0 & (1 << FCR0_FREP)) {
if (env->CP0_Config5 & (1 << CP0C5_UFE)) {
arg1 = (env->CP0_Config5 >> CP0C5_FRE) & 1;
} else {
helper_raise_exception(env, EXCP_RI);
}
}
break;
case 25:
arg1 = ((env->active_fpu.fcr31 >> 24) & 0xfe) | ((env->active_fpu.fcr31 >> 23) & 0x1);
break;
@@ -2347,6 +2357,30 @@ void helper_ctc1(CPUMIPSState *env, target_ulong arg1, uint32_t fs, uint32_t rt)
helper_raise_exception(env, EXCP_RI);
}
break;
case 5:
/* FRE Support - clear Config5.FRE bit */
if (!((env->active_fpu.fcr0 & (1 << FCR0_FREP)) && (rt == 0))) {
return;
}
if (env->CP0_Config5 & (1 << CP0C5_UFE)) {
env->CP0_Config5 &= ~(1 << CP0C5_FRE);
compute_hflags(env);
} else {
helper_raise_exception(env, EXCP_RI);
}
break;
case 6:
/* FRE Support - set Config5.FRE bit */
if (!((env->active_fpu.fcr0 & (1 << FCR0_FREP)) && (rt == 0))) {
return;
}
if (env->CP0_Config5 & (1 << CP0C5_UFE)) {
env->CP0_Config5 |= (1 << CP0C5_FRE);
compute_hflags(env);
} else {
helper_raise_exception(env, EXCP_RI);
}
break;
case 25:
if ((env->insn_flags & ISA_MIPS32R6) || (arg1 & 0xffffff00)) {
return;
target-mips/translate.c
+158 -150
View File
File diff suppressed because it is too large Load Diff
target-mips/translate_init.c
+5 -4
View File
@@ -622,7 +622,8 @@ static const mips_def_t mips_defs[] =
(1 << CP0C3_BI) | (1 << CP0C3_ULRI) | (1U << CP0C3_M),
.CP0_Config4 = MIPS_CONFIG4 | (0xfc << CP0C4_KScrExist) |
(3 << CP0C4_IE) | (1 << CP0C4_M),
.CP0_Config5_rw_bitmask = (1 << CP0C5_SBRI),
.CP0_Config5_rw_bitmask = (1 << CP0C5_SBRI) | (1 << CP0C5_FRE) |
(1 << CP0C5_UFE),
.CP0_LLAddr_rw_bitmask = 0,
.CP0_LLAddr_shift = 0,
.SYNCI_Step = 32,
@@ -631,9 +632,9 @@ static const mips_def_t mips_defs[] =
.CP0_PageGrain = (1 << CP0PG_IEC) | (1 << CP0PG_XIE) |
(1U << CP0PG_RIE),
.CP0_PageGrain_rw_bitmask = 0,
.CP1_fcr0 = (1 << FCR0_F64) | (1 << FCR0_L) | (1 << FCR0_W) |
(1 << FCR0_D) | (1 << FCR0_S) | (0x00 << FCR0_PRID) |
(0x0 << FCR0_REV),
.CP1_fcr0 = (1 << FCR0_FREP) | (1 << FCR0_F64) | (1 << FCR0_L) |
(1 << FCR0_W) | (1 << FCR0_D) | (1 << FCR0_S) |
(0x00 << FCR0_PRID) | (0x0 << FCR0_REV),
.SEGBITS = 42,
/* The architectural limit is 59, but we have hardcoded 36 bit
in some places...