diff options
Diffstat (limited to 'arch/mips/math-emu')
| -rw-r--r-- | arch/mips/math-emu/cp1emu.c | 130 |
1 files changed, 121 insertions, 9 deletions
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c index 8a5b0eb4ddef..ef41fc895e75 100644 --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -1394,6 +1394,14 @@ static const unsigned char cmptab[8] = { IEEE754_CLT | IEEE754_CEQ | IEEE754_CUN, /* cmp_ule (sig) cmp_ngt */ }; +static const unsigned char negative_cmptab[8] = { + 0, /* Reserved */ + IEEE754_CLT | IEEE754_CGT | IEEE754_CEQ, + IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, + IEEE754_CLT | IEEE754_CGT, + /* Reserved */ +}; + /* * Additional MIPS4 instructions @@ -1838,7 +1846,7 @@ copcsr: goto copcsr; default: - if (MIPSInst_FUNC(ir) >= fcmp_op) { + if (!NO_R6EMU && MIPSInst_FUNC(ir) >= fcmp_op) { unsigned cmpop = MIPSInst_FUNC(ir) - fcmp_op; union ieee754sp fs, ft; @@ -2015,7 +2023,7 @@ dcopuop: goto copcsr; default: - if (MIPSInst_FUNC(ir) >= fcmp_op) { + if (!NO_R6EMU && MIPSInst_FUNC(ir) >= fcmp_op) { unsigned cmpop = MIPSInst_FUNC(ir) - fcmp_op; union ieee754dp fs, ft; @@ -2057,10 +2065,65 @@ dcopuop: rv.d = ieee754dp_fint(fs.bits); rfmt = d_fmt; goto copcsr; - default: - return SIGILL; + default: { + /* Emulating the new CMP.condn.fmt R6 instruction */ +#define CMPOP_MASK 0x7 +#define SIGN_BIT (0x1 << 3) +#define PREDICATE_BIT (0x1 << 4) + + int cmpop = MIPSInst_FUNC(ir) & CMPOP_MASK; + int sig = MIPSInst_FUNC(ir) & SIGN_BIT; + union ieee754sp fs, ft; + + /* This is an R6 only instruction */ + if (!cpu_has_mips_r6 || + (MIPSInst_FUNC(ir) & 0x20)) + return SIGILL; + + /* fmt is w_fmt for single precision so fix it */ + rfmt = s_fmt; + /* default to false */ + rv.w = 0; + + /* CMP.condn.S */ + SPFROMREG(fs, MIPSInst_FS(ir)); + SPFROMREG(ft, MIPSInst_FT(ir)); + + /* positive predicates */ + if (!(MIPSInst_FUNC(ir) & PREDICATE_BIT)) { + if (ieee754sp_cmp(fs, ft, cmptab[cmpop], + sig)) + rv.w = -1; /* true, all 1s */ + if ((sig) && + ieee754_cxtest(IEEE754_INVALID_OPERATION)) + rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; + else + goto copcsr; + } else { + /* negative predicates */ + switch (cmpop) { + case 1: + case 2: + case 3: + if (ieee754sp_cmp(fs, ft, + negative_cmptab[cmpop], + sig)) + rv.w = -1; /* true, all 1s */ + if (sig && + ieee754_cxtest(IEEE754_INVALID_OPERATION)) + rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; + else + goto copcsr; + break; + default: + /* Reserved R6 ops */ + pr_err("Reserved MIPS R6 CMP.condn.S operation\n"); + return SIGILL; + } + } + break; + } } - break; } case l_fmt: @@ -2081,11 +2144,60 @@ dcopuop: rv.d = ieee754dp_flong(bits); rfmt = d_fmt; goto copcsr; - default: - return SIGILL; - } - break; + default: { + /* Emulating the new CMP.condn.fmt R6 instruction */ + int cmpop = MIPSInst_FUNC(ir) & CMPOP_MASK; + int sig = MIPSInst_FUNC(ir) & SIGN_BIT; + union ieee754dp fs, ft; + + if (!cpu_has_mips_r6 || + (MIPSInst_FUNC(ir) & 0x20)) + return SIGILL; + /* fmt is l_fmt for double precision so fix it */ + rfmt = d_fmt; + /* default to false */ + rv.l = 0; + + /* CMP.condn.D */ + DPFROMREG(fs, MIPSInst_FS(ir)); + DPFROMREG(ft, MIPSInst_FT(ir)); + + /* positive predicates */ + if (!(MIPSInst_FUNC(ir) & PREDICATE_BIT)) { + if (ieee754dp_cmp(fs, ft, + cmptab[cmpop], sig)) + rv.l = -1LL; /* true, all 1s */ + if (sig && + ieee754_cxtest(IEEE754_INVALID_OPERATION)) + rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; + else + goto copcsr; + } else { + /* negative predicates */ + switch (cmpop) { + case 1: + case 2: + case 3: + if (ieee754dp_cmp(fs, ft, + negative_cmptab[cmpop], + sig)) + rv.l = -1LL; /* true, all 1s */ + if (sig && + ieee754_cxtest(IEEE754_INVALID_OPERATION)) + rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; + else + goto copcsr; + break; + default: + /* Reserved R6 ops */ + pr_err("Reserved MIPS R6 CMP.condn.D operation\n"); + return SIGILL; + } + } + break; + } + } default: return SIGILL; } |