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![Linus Torvalds](/assets/img/avatar_default.png)
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
931 lines
20 KiB
C
931 lines
20 KiB
C
/*
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* arch/powerpc/math-emu/math_efp.c
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*
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* Copyright (C) 2006-2008, 2010 Freescale Semiconductor, Inc.
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*
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* Author: Ebony Zhu, <ebony.zhu@freescale.com>
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* Yu Liu, <yu.liu@freescale.com>
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*
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* Derived from arch/alpha/math-emu/math.c
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* arch/powerpc/math-emu/math.c
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*
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* Description:
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* This file is the exception handler to make E500 SPE instructions
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* fully comply with IEEE-754 floating point standard.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/prctl.h>
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#include <linux/uaccess.h>
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#include <asm/reg.h>
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#define FP_EX_BOOKE_E500_SPE
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#include <asm/sfp-machine.h>
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#include <math-emu/soft-fp.h>
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#include <math-emu/single.h>
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#include <math-emu/double.h>
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#define EFAPU 0x4
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#define VCT 0x4
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#define SPFP 0x6
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#define DPFP 0x7
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#define EFSADD 0x2c0
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#define EFSSUB 0x2c1
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#define EFSABS 0x2c4
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#define EFSNABS 0x2c5
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#define EFSNEG 0x2c6
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#define EFSMUL 0x2c8
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#define EFSDIV 0x2c9
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#define EFSCMPGT 0x2cc
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#define EFSCMPLT 0x2cd
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#define EFSCMPEQ 0x2ce
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#define EFSCFD 0x2cf
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#define EFSCFSI 0x2d1
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#define EFSCTUI 0x2d4
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#define EFSCTSI 0x2d5
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#define EFSCTUF 0x2d6
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#define EFSCTSF 0x2d7
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#define EFSCTUIZ 0x2d8
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#define EFSCTSIZ 0x2da
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#define EVFSADD 0x280
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#define EVFSSUB 0x281
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#define EVFSABS 0x284
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#define EVFSNABS 0x285
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#define EVFSNEG 0x286
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#define EVFSMUL 0x288
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#define EVFSDIV 0x289
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#define EVFSCMPGT 0x28c
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#define EVFSCMPLT 0x28d
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#define EVFSCMPEQ 0x28e
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#define EVFSCTUI 0x294
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#define EVFSCTSI 0x295
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#define EVFSCTUF 0x296
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#define EVFSCTSF 0x297
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#define EVFSCTUIZ 0x298
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#define EVFSCTSIZ 0x29a
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#define EFDADD 0x2e0
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#define EFDSUB 0x2e1
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#define EFDABS 0x2e4
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#define EFDNABS 0x2e5
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#define EFDNEG 0x2e6
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#define EFDMUL 0x2e8
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#define EFDDIV 0x2e9
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#define EFDCTUIDZ 0x2ea
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#define EFDCTSIDZ 0x2eb
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#define EFDCMPGT 0x2ec
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#define EFDCMPLT 0x2ed
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#define EFDCMPEQ 0x2ee
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#define EFDCFS 0x2ef
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#define EFDCTUI 0x2f4
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#define EFDCTSI 0x2f5
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#define EFDCTUF 0x2f6
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#define EFDCTSF 0x2f7
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#define EFDCTUIZ 0x2f8
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#define EFDCTSIZ 0x2fa
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#define AB 2
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#define XA 3
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#define XB 4
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#define XCR 5
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#define NOTYPE 0
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#define SIGN_BIT_S (1UL << 31)
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#define SIGN_BIT_D (1ULL << 63)
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#define FP_EX_MASK (FP_EX_INEXACT | FP_EX_INVALID | FP_EX_DIVZERO | \
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FP_EX_UNDERFLOW | FP_EX_OVERFLOW)
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static int have_e500_cpu_a005_erratum;
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union dw_union {
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u64 dp[1];
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u32 wp[2];
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};
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static unsigned long insn_type(unsigned long speinsn)
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{
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unsigned long ret = NOTYPE;
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switch (speinsn & 0x7ff) {
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case EFSABS: ret = XA; break;
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case EFSADD: ret = AB; break;
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case EFSCFD: ret = XB; break;
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case EFSCMPEQ: ret = XCR; break;
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case EFSCMPGT: ret = XCR; break;
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case EFSCMPLT: ret = XCR; break;
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case EFSCTSF: ret = XB; break;
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case EFSCTSI: ret = XB; break;
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case EFSCTSIZ: ret = XB; break;
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case EFSCTUF: ret = XB; break;
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case EFSCTUI: ret = XB; break;
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case EFSCTUIZ: ret = XB; break;
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case EFSDIV: ret = AB; break;
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case EFSMUL: ret = AB; break;
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case EFSNABS: ret = XA; break;
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case EFSNEG: ret = XA; break;
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case EFSSUB: ret = AB; break;
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case EFSCFSI: ret = XB; break;
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case EVFSABS: ret = XA; break;
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case EVFSADD: ret = AB; break;
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case EVFSCMPEQ: ret = XCR; break;
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case EVFSCMPGT: ret = XCR; break;
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case EVFSCMPLT: ret = XCR; break;
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case EVFSCTSF: ret = XB; break;
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case EVFSCTSI: ret = XB; break;
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case EVFSCTSIZ: ret = XB; break;
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case EVFSCTUF: ret = XB; break;
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case EVFSCTUI: ret = XB; break;
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case EVFSCTUIZ: ret = XB; break;
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case EVFSDIV: ret = AB; break;
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case EVFSMUL: ret = AB; break;
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case EVFSNABS: ret = XA; break;
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case EVFSNEG: ret = XA; break;
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case EVFSSUB: ret = AB; break;
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case EFDABS: ret = XA; break;
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case EFDADD: ret = AB; break;
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case EFDCFS: ret = XB; break;
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case EFDCMPEQ: ret = XCR; break;
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case EFDCMPGT: ret = XCR; break;
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case EFDCMPLT: ret = XCR; break;
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case EFDCTSF: ret = XB; break;
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case EFDCTSI: ret = XB; break;
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case EFDCTSIDZ: ret = XB; break;
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case EFDCTSIZ: ret = XB; break;
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case EFDCTUF: ret = XB; break;
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case EFDCTUI: ret = XB; break;
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case EFDCTUIDZ: ret = XB; break;
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case EFDCTUIZ: ret = XB; break;
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case EFDDIV: ret = AB; break;
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case EFDMUL: ret = AB; break;
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case EFDNABS: ret = XA; break;
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case EFDNEG: ret = XA; break;
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case EFDSUB: ret = AB; break;
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}
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return ret;
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}
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int do_spe_mathemu(struct pt_regs *regs)
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{
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FP_DECL_EX;
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int IR, cmp;
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unsigned long type, func, fc, fa, fb, src, speinsn;
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union dw_union vc, va, vb;
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if (get_user(speinsn, (unsigned int __user *) regs->nip))
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return -EFAULT;
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if ((speinsn >> 26) != EFAPU)
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return -EINVAL; /* not an spe instruction */
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type = insn_type(speinsn);
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if (type == NOTYPE)
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goto illegal;
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func = speinsn & 0x7ff;
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fc = (speinsn >> 21) & 0x1f;
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fa = (speinsn >> 16) & 0x1f;
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fb = (speinsn >> 11) & 0x1f;
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src = (speinsn >> 5) & 0x7;
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vc.wp[0] = current->thread.evr[fc];
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vc.wp[1] = regs->gpr[fc];
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va.wp[0] = current->thread.evr[fa];
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va.wp[1] = regs->gpr[fa];
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vb.wp[0] = current->thread.evr[fb];
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vb.wp[1] = regs->gpr[fb];
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__FPU_FPSCR = mfspr(SPRN_SPEFSCR);
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pr_debug("speinsn:%08lx spefscr:%08lx\n", speinsn, __FPU_FPSCR);
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pr_debug("vc: %08x %08x\n", vc.wp[0], vc.wp[1]);
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pr_debug("va: %08x %08x\n", va.wp[0], va.wp[1]);
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pr_debug("vb: %08x %08x\n", vb.wp[0], vb.wp[1]);
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switch (src) {
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case SPFP: {
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FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
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switch (type) {
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case AB:
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case XCR:
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FP_UNPACK_SP(SA, va.wp + 1);
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case XB:
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FP_UNPACK_SP(SB, vb.wp + 1);
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break;
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case XA:
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FP_UNPACK_SP(SA, va.wp + 1);
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break;
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}
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pr_debug("SA: %ld %08lx %ld (%ld)\n", SA_s, SA_f, SA_e, SA_c);
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pr_debug("SB: %ld %08lx %ld (%ld)\n", SB_s, SB_f, SB_e, SB_c);
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switch (func) {
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case EFSABS:
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vc.wp[1] = va.wp[1] & ~SIGN_BIT_S;
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goto update_regs;
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case EFSNABS:
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vc.wp[1] = va.wp[1] | SIGN_BIT_S;
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goto update_regs;
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case EFSNEG:
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vc.wp[1] = va.wp[1] ^ SIGN_BIT_S;
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goto update_regs;
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case EFSADD:
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FP_ADD_S(SR, SA, SB);
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goto pack_s;
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case EFSSUB:
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FP_SUB_S(SR, SA, SB);
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goto pack_s;
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case EFSMUL:
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FP_MUL_S(SR, SA, SB);
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goto pack_s;
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case EFSDIV:
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FP_DIV_S(SR, SA, SB);
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goto pack_s;
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case EFSCMPEQ:
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cmp = 0;
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goto cmp_s;
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case EFSCMPGT:
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cmp = 1;
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goto cmp_s;
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case EFSCMPLT:
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cmp = -1;
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goto cmp_s;
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case EFSCTSF:
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case EFSCTUF:
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if (SB_c == FP_CLS_NAN) {
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vc.wp[1] = 0;
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FP_SET_EXCEPTION(FP_EX_INVALID);
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} else {
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SB_e += (func == EFSCTSF ? 31 : 32);
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FP_TO_INT_ROUND_S(vc.wp[1], SB, 32,
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(func == EFSCTSF));
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}
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goto update_regs;
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case EFSCFD: {
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FP_DECL_D(DB);
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FP_CLEAR_EXCEPTIONS;
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FP_UNPACK_DP(DB, vb.dp);
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pr_debug("DB: %ld %08lx %08lx %ld (%ld)\n",
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DB_s, DB_f1, DB_f0, DB_e, DB_c);
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FP_CONV(S, D, 1, 2, SR, DB);
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goto pack_s;
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}
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case EFSCTSI:
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case EFSCTUI:
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if (SB_c == FP_CLS_NAN) {
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vc.wp[1] = 0;
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FP_SET_EXCEPTION(FP_EX_INVALID);
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} else {
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FP_TO_INT_ROUND_S(vc.wp[1], SB, 32,
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((func & 0x3) != 0));
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}
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goto update_regs;
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case EFSCTSIZ:
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case EFSCTUIZ:
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if (SB_c == FP_CLS_NAN) {
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vc.wp[1] = 0;
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FP_SET_EXCEPTION(FP_EX_INVALID);
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} else {
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FP_TO_INT_S(vc.wp[1], SB, 32,
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((func & 0x3) != 0));
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}
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goto update_regs;
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default:
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goto illegal;
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}
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break;
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pack_s:
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pr_debug("SR: %ld %08lx %ld (%ld)\n", SR_s, SR_f, SR_e, SR_c);
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FP_PACK_SP(vc.wp + 1, SR);
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goto update_regs;
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cmp_s:
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FP_CMP_S(IR, SA, SB, 3);
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if (IR == 3 && (FP_ISSIGNAN_S(SA) || FP_ISSIGNAN_S(SB)))
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FP_SET_EXCEPTION(FP_EX_INVALID);
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if (IR == cmp) {
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IR = 0x4;
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} else {
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IR = 0;
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}
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goto update_ccr;
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}
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|
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case DPFP: {
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FP_DECL_D(DA); FP_DECL_D(DB); FP_DECL_D(DR);
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|
|
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switch (type) {
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case AB:
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case XCR:
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FP_UNPACK_DP(DA, va.dp);
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case XB:
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FP_UNPACK_DP(DB, vb.dp);
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break;
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case XA:
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FP_UNPACK_DP(DA, va.dp);
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break;
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}
|
|
|
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pr_debug("DA: %ld %08lx %08lx %ld (%ld)\n",
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DA_s, DA_f1, DA_f0, DA_e, DA_c);
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pr_debug("DB: %ld %08lx %08lx %ld (%ld)\n",
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DB_s, DB_f1, DB_f0, DB_e, DB_c);
|
|
|
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switch (func) {
|
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case EFDABS:
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vc.dp[0] = va.dp[0] & ~SIGN_BIT_D;
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goto update_regs;
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|
|
|
case EFDNABS:
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vc.dp[0] = va.dp[0] | SIGN_BIT_D;
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goto update_regs;
|
|
|
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case EFDNEG:
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vc.dp[0] = va.dp[0] ^ SIGN_BIT_D;
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goto update_regs;
|
|
|
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case EFDADD:
|
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FP_ADD_D(DR, DA, DB);
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goto pack_d;
|
|
|
|
case EFDSUB:
|
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FP_SUB_D(DR, DA, DB);
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goto pack_d;
|
|
|
|
case EFDMUL:
|
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FP_MUL_D(DR, DA, DB);
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goto pack_d;
|
|
|
|
case EFDDIV:
|
|
FP_DIV_D(DR, DA, DB);
|
|
goto pack_d;
|
|
|
|
case EFDCMPEQ:
|
|
cmp = 0;
|
|
goto cmp_d;
|
|
|
|
case EFDCMPGT:
|
|
cmp = 1;
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|
goto cmp_d;
|
|
|
|
case EFDCMPLT:
|
|
cmp = -1;
|
|
goto cmp_d;
|
|
|
|
case EFDCTSF:
|
|
case EFDCTUF:
|
|
if (DB_c == FP_CLS_NAN) {
|
|
vc.wp[1] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
DB_e += (func == EFDCTSF ? 31 : 32);
|
|
FP_TO_INT_ROUND_D(vc.wp[1], DB, 32,
|
|
(func == EFDCTSF));
|
|
}
|
|
goto update_regs;
|
|
|
|
case EFDCFS: {
|
|
FP_DECL_S(SB);
|
|
FP_CLEAR_EXCEPTIONS;
|
|
FP_UNPACK_SP(SB, vb.wp + 1);
|
|
|
|
pr_debug("SB: %ld %08lx %ld (%ld)\n",
|
|
SB_s, SB_f, SB_e, SB_c);
|
|
|
|
FP_CONV(D, S, 2, 1, DR, SB);
|
|
goto pack_d;
|
|
}
|
|
|
|
case EFDCTUIDZ:
|
|
case EFDCTSIDZ:
|
|
if (DB_c == FP_CLS_NAN) {
|
|
vc.dp[0] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
FP_TO_INT_D(vc.dp[0], DB, 64,
|
|
((func & 0x1) == 0));
|
|
}
|
|
goto update_regs;
|
|
|
|
case EFDCTUI:
|
|
case EFDCTSI:
|
|
if (DB_c == FP_CLS_NAN) {
|
|
vc.wp[1] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
FP_TO_INT_ROUND_D(vc.wp[1], DB, 32,
|
|
((func & 0x3) != 0));
|
|
}
|
|
goto update_regs;
|
|
|
|
case EFDCTUIZ:
|
|
case EFDCTSIZ:
|
|
if (DB_c == FP_CLS_NAN) {
|
|
vc.wp[1] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
FP_TO_INT_D(vc.wp[1], DB, 32,
|
|
((func & 0x3) != 0));
|
|
}
|
|
goto update_regs;
|
|
|
|
default:
|
|
goto illegal;
|
|
}
|
|
break;
|
|
|
|
pack_d:
|
|
pr_debug("DR: %ld %08lx %08lx %ld (%ld)\n",
|
|
DR_s, DR_f1, DR_f0, DR_e, DR_c);
|
|
|
|
FP_PACK_DP(vc.dp, DR);
|
|
goto update_regs;
|
|
|
|
cmp_d:
|
|
FP_CMP_D(IR, DA, DB, 3);
|
|
if (IR == 3 && (FP_ISSIGNAN_D(DA) || FP_ISSIGNAN_D(DB)))
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
if (IR == cmp) {
|
|
IR = 0x4;
|
|
} else {
|
|
IR = 0;
|
|
}
|
|
goto update_ccr;
|
|
|
|
}
|
|
|
|
case VCT: {
|
|
FP_DECL_S(SA0); FP_DECL_S(SB0); FP_DECL_S(SR0);
|
|
FP_DECL_S(SA1); FP_DECL_S(SB1); FP_DECL_S(SR1);
|
|
int IR0, IR1;
|
|
|
|
switch (type) {
|
|
case AB:
|
|
case XCR:
|
|
FP_UNPACK_SP(SA0, va.wp);
|
|
FP_UNPACK_SP(SA1, va.wp + 1);
|
|
case XB:
|
|
FP_UNPACK_SP(SB0, vb.wp);
|
|
FP_UNPACK_SP(SB1, vb.wp + 1);
|
|
break;
|
|
case XA:
|
|
FP_UNPACK_SP(SA0, va.wp);
|
|
FP_UNPACK_SP(SA1, va.wp + 1);
|
|
break;
|
|
}
|
|
|
|
pr_debug("SA0: %ld %08lx %ld (%ld)\n",
|
|
SA0_s, SA0_f, SA0_e, SA0_c);
|
|
pr_debug("SA1: %ld %08lx %ld (%ld)\n",
|
|
SA1_s, SA1_f, SA1_e, SA1_c);
|
|
pr_debug("SB0: %ld %08lx %ld (%ld)\n",
|
|
SB0_s, SB0_f, SB0_e, SB0_c);
|
|
pr_debug("SB1: %ld %08lx %ld (%ld)\n",
|
|
SB1_s, SB1_f, SB1_e, SB1_c);
|
|
|
|
switch (func) {
|
|
case EVFSABS:
|
|
vc.wp[0] = va.wp[0] & ~SIGN_BIT_S;
|
|
vc.wp[1] = va.wp[1] & ~SIGN_BIT_S;
|
|
goto update_regs;
|
|
|
|
case EVFSNABS:
|
|
vc.wp[0] = va.wp[0] | SIGN_BIT_S;
|
|
vc.wp[1] = va.wp[1] | SIGN_BIT_S;
|
|
goto update_regs;
|
|
|
|
case EVFSNEG:
|
|
vc.wp[0] = va.wp[0] ^ SIGN_BIT_S;
|
|
vc.wp[1] = va.wp[1] ^ SIGN_BIT_S;
|
|
goto update_regs;
|
|
|
|
case EVFSADD:
|
|
FP_ADD_S(SR0, SA0, SB0);
|
|
FP_ADD_S(SR1, SA1, SB1);
|
|
goto pack_vs;
|
|
|
|
case EVFSSUB:
|
|
FP_SUB_S(SR0, SA0, SB0);
|
|
FP_SUB_S(SR1, SA1, SB1);
|
|
goto pack_vs;
|
|
|
|
case EVFSMUL:
|
|
FP_MUL_S(SR0, SA0, SB0);
|
|
FP_MUL_S(SR1, SA1, SB1);
|
|
goto pack_vs;
|
|
|
|
case EVFSDIV:
|
|
FP_DIV_S(SR0, SA0, SB0);
|
|
FP_DIV_S(SR1, SA1, SB1);
|
|
goto pack_vs;
|
|
|
|
case EVFSCMPEQ:
|
|
cmp = 0;
|
|
goto cmp_vs;
|
|
|
|
case EVFSCMPGT:
|
|
cmp = 1;
|
|
goto cmp_vs;
|
|
|
|
case EVFSCMPLT:
|
|
cmp = -1;
|
|
goto cmp_vs;
|
|
|
|
case EVFSCTUF:
|
|
case EVFSCTSF:
|
|
if (SB0_c == FP_CLS_NAN) {
|
|
vc.wp[0] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
SB0_e += (func == EVFSCTSF ? 31 : 32);
|
|
FP_TO_INT_ROUND_S(vc.wp[0], SB0, 32,
|
|
(func == EVFSCTSF));
|
|
}
|
|
if (SB1_c == FP_CLS_NAN) {
|
|
vc.wp[1] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
SB1_e += (func == EVFSCTSF ? 31 : 32);
|
|
FP_TO_INT_ROUND_S(vc.wp[1], SB1, 32,
|
|
(func == EVFSCTSF));
|
|
}
|
|
goto update_regs;
|
|
|
|
case EVFSCTUI:
|
|
case EVFSCTSI:
|
|
if (SB0_c == FP_CLS_NAN) {
|
|
vc.wp[0] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
FP_TO_INT_ROUND_S(vc.wp[0], SB0, 32,
|
|
((func & 0x3) != 0));
|
|
}
|
|
if (SB1_c == FP_CLS_NAN) {
|
|
vc.wp[1] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
FP_TO_INT_ROUND_S(vc.wp[1], SB1, 32,
|
|
((func & 0x3) != 0));
|
|
}
|
|
goto update_regs;
|
|
|
|
case EVFSCTUIZ:
|
|
case EVFSCTSIZ:
|
|
if (SB0_c == FP_CLS_NAN) {
|
|
vc.wp[0] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
FP_TO_INT_S(vc.wp[0], SB0, 32,
|
|
((func & 0x3) != 0));
|
|
}
|
|
if (SB1_c == FP_CLS_NAN) {
|
|
vc.wp[1] = 0;
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
} else {
|
|
FP_TO_INT_S(vc.wp[1], SB1, 32,
|
|
((func & 0x3) != 0));
|
|
}
|
|
goto update_regs;
|
|
|
|
default:
|
|
goto illegal;
|
|
}
|
|
break;
|
|
|
|
pack_vs:
|
|
pr_debug("SR0: %ld %08lx %ld (%ld)\n",
|
|
SR0_s, SR0_f, SR0_e, SR0_c);
|
|
pr_debug("SR1: %ld %08lx %ld (%ld)\n",
|
|
SR1_s, SR1_f, SR1_e, SR1_c);
|
|
|
|
FP_PACK_SP(vc.wp, SR0);
|
|
FP_PACK_SP(vc.wp + 1, SR1);
|
|
goto update_regs;
|
|
|
|
cmp_vs:
|
|
{
|
|
int ch, cl;
|
|
|
|
FP_CMP_S(IR0, SA0, SB0, 3);
|
|
FP_CMP_S(IR1, SA1, SB1, 3);
|
|
if (IR0 == 3 && (FP_ISSIGNAN_S(SA0) || FP_ISSIGNAN_S(SB0)))
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
if (IR1 == 3 && (FP_ISSIGNAN_S(SA1) || FP_ISSIGNAN_S(SB1)))
|
|
FP_SET_EXCEPTION(FP_EX_INVALID);
|
|
ch = (IR0 == cmp) ? 1 : 0;
|
|
cl = (IR1 == cmp) ? 1 : 0;
|
|
IR = (ch << 3) | (cl << 2) | ((ch | cl) << 1) |
|
|
((ch & cl) << 0);
|
|
goto update_ccr;
|
|
}
|
|
}
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
update_ccr:
|
|
regs->ccr &= ~(15 << ((7 - ((speinsn >> 23) & 0x7)) << 2));
|
|
regs->ccr |= (IR << ((7 - ((speinsn >> 23) & 0x7)) << 2));
|
|
|
|
update_regs:
|
|
/*
|
|
* If the "invalid" exception sticky bit was set by the
|
|
* processor for non-finite input, but was not set before the
|
|
* instruction being emulated, clear it. Likewise for the
|
|
* "underflow" bit, which may have been set by the processor
|
|
* for exact underflow, not just inexact underflow when the
|
|
* flag should be set for IEEE 754 semantics. Other sticky
|
|
* exceptions will only be set by the processor when they are
|
|
* correct according to IEEE 754 semantics, and we must not
|
|
* clear sticky bits that were already set before the emulated
|
|
* instruction as they represent the user-visible sticky
|
|
* exception status. "inexact" traps to kernel are not
|
|
* required for IEEE semantics and are not enabled by default,
|
|
* so the "inexact" sticky bit may have been set by a previous
|
|
* instruction without the kernel being aware of it.
|
|
*/
|
|
__FPU_FPSCR
|
|
&= ~(FP_EX_INVALID | FP_EX_UNDERFLOW) | current->thread.spefscr_last;
|
|
__FPU_FPSCR |= (FP_CUR_EXCEPTIONS & FP_EX_MASK);
|
|
mtspr(SPRN_SPEFSCR, __FPU_FPSCR);
|
|
current->thread.spefscr_last = __FPU_FPSCR;
|
|
|
|
current->thread.evr[fc] = vc.wp[0];
|
|
regs->gpr[fc] = vc.wp[1];
|
|
|
|
pr_debug("ccr = %08lx\n", regs->ccr);
|
|
pr_debug("cur exceptions = %08x spefscr = %08lx\n",
|
|
FP_CUR_EXCEPTIONS, __FPU_FPSCR);
|
|
pr_debug("vc: %08x %08x\n", vc.wp[0], vc.wp[1]);
|
|
pr_debug("va: %08x %08x\n", va.wp[0], va.wp[1]);
|
|
pr_debug("vb: %08x %08x\n", vb.wp[0], vb.wp[1]);
|
|
|
|
if (current->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) {
|
|
if ((FP_CUR_EXCEPTIONS & FP_EX_DIVZERO)
|
|
&& (current->thread.fpexc_mode & PR_FP_EXC_DIV))
|
|
return 1;
|
|
if ((FP_CUR_EXCEPTIONS & FP_EX_OVERFLOW)
|
|
&& (current->thread.fpexc_mode & PR_FP_EXC_OVF))
|
|
return 1;
|
|
if ((FP_CUR_EXCEPTIONS & FP_EX_UNDERFLOW)
|
|
&& (current->thread.fpexc_mode & PR_FP_EXC_UND))
|
|
return 1;
|
|
if ((FP_CUR_EXCEPTIONS & FP_EX_INEXACT)
|
|
&& (current->thread.fpexc_mode & PR_FP_EXC_RES))
|
|
return 1;
|
|
if ((FP_CUR_EXCEPTIONS & FP_EX_INVALID)
|
|
&& (current->thread.fpexc_mode & PR_FP_EXC_INV))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
|
|
illegal:
|
|
if (have_e500_cpu_a005_erratum) {
|
|
/* according to e500 cpu a005 erratum, reissue efp inst */
|
|
regs->nip -= 4;
|
|
pr_debug("re-issue efp inst: %08lx\n", speinsn);
|
|
return 0;
|
|
}
|
|
|
|
printk(KERN_ERR "\nOoops! IEEE-754 compliance handler encountered un-supported instruction.\ninst code: %08lx\n", speinsn);
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int speround_handler(struct pt_regs *regs)
|
|
{
|
|
union dw_union fgpr;
|
|
int s_lo, s_hi;
|
|
int lo_inexact, hi_inexact;
|
|
int fp_result;
|
|
unsigned long speinsn, type, fb, fc, fptype, func;
|
|
|
|
if (get_user(speinsn, (unsigned int __user *) regs->nip))
|
|
return -EFAULT;
|
|
if ((speinsn >> 26) != 4)
|
|
return -EINVAL; /* not an spe instruction */
|
|
|
|
func = speinsn & 0x7ff;
|
|
type = insn_type(func);
|
|
if (type == XCR) return -ENOSYS;
|
|
|
|
__FPU_FPSCR = mfspr(SPRN_SPEFSCR);
|
|
pr_debug("speinsn:%08lx spefscr:%08lx\n", speinsn, __FPU_FPSCR);
|
|
|
|
fptype = (speinsn >> 5) & 0x7;
|
|
|
|
/* No need to round if the result is exact */
|
|
lo_inexact = __FPU_FPSCR & (SPEFSCR_FG | SPEFSCR_FX);
|
|
hi_inexact = __FPU_FPSCR & (SPEFSCR_FGH | SPEFSCR_FXH);
|
|
if (!(lo_inexact || (hi_inexact && fptype == VCT)))
|
|
return 0;
|
|
|
|
fc = (speinsn >> 21) & 0x1f;
|
|
s_lo = regs->gpr[fc] & SIGN_BIT_S;
|
|
s_hi = current->thread.evr[fc] & SIGN_BIT_S;
|
|
fgpr.wp[0] = current->thread.evr[fc];
|
|
fgpr.wp[1] = regs->gpr[fc];
|
|
|
|
fb = (speinsn >> 11) & 0x1f;
|
|
switch (func) {
|
|
case EFSCTUIZ:
|
|
case EFSCTSIZ:
|
|
case EVFSCTUIZ:
|
|
case EVFSCTSIZ:
|
|
case EFDCTUIDZ:
|
|
case EFDCTSIDZ:
|
|
case EFDCTUIZ:
|
|
case EFDCTSIZ:
|
|
/*
|
|
* These instructions always round to zero,
|
|
* independent of the rounding mode.
|
|
*/
|
|
return 0;
|
|
|
|
case EFSCTUI:
|
|
case EFSCTUF:
|
|
case EVFSCTUI:
|
|
case EVFSCTUF:
|
|
case EFDCTUI:
|
|
case EFDCTUF:
|
|
fp_result = 0;
|
|
s_lo = 0;
|
|
s_hi = 0;
|
|
break;
|
|
|
|
case EFSCTSI:
|
|
case EFSCTSF:
|
|
fp_result = 0;
|
|
/* Recover the sign of a zero result if possible. */
|
|
if (fgpr.wp[1] == 0)
|
|
s_lo = regs->gpr[fb] & SIGN_BIT_S;
|
|
break;
|
|
|
|
case EVFSCTSI:
|
|
case EVFSCTSF:
|
|
fp_result = 0;
|
|
/* Recover the sign of a zero result if possible. */
|
|
if (fgpr.wp[1] == 0)
|
|
s_lo = regs->gpr[fb] & SIGN_BIT_S;
|
|
if (fgpr.wp[0] == 0)
|
|
s_hi = current->thread.evr[fb] & SIGN_BIT_S;
|
|
break;
|
|
|
|
case EFDCTSI:
|
|
case EFDCTSF:
|
|
fp_result = 0;
|
|
s_hi = s_lo;
|
|
/* Recover the sign of a zero result if possible. */
|
|
if (fgpr.wp[1] == 0)
|
|
s_hi = current->thread.evr[fb] & SIGN_BIT_S;
|
|
break;
|
|
|
|
default:
|
|
fp_result = 1;
|
|
break;
|
|
}
|
|
|
|
pr_debug("round fgpr: %08x %08x\n", fgpr.wp[0], fgpr.wp[1]);
|
|
|
|
switch (fptype) {
|
|
/* Since SPE instructions on E500 core can handle round to nearest
|
|
* and round toward zero with IEEE-754 complied, we just need
|
|
* to handle round toward +Inf and round toward -Inf by software.
|
|
*/
|
|
case SPFP:
|
|
if ((FP_ROUNDMODE) == FP_RND_PINF) {
|
|
if (!s_lo) fgpr.wp[1]++; /* Z > 0, choose Z1 */
|
|
} else { /* round to -Inf */
|
|
if (s_lo) {
|
|
if (fp_result)
|
|
fgpr.wp[1]++; /* Z < 0, choose Z2 */
|
|
else
|
|
fgpr.wp[1]--; /* Z < 0, choose Z2 */
|
|
}
|
|
}
|
|
break;
|
|
|
|
case DPFP:
|
|
if (FP_ROUNDMODE == FP_RND_PINF) {
|
|
if (!s_hi) {
|
|
if (fp_result)
|
|
fgpr.dp[0]++; /* Z > 0, choose Z1 */
|
|
else
|
|
fgpr.wp[1]++; /* Z > 0, choose Z1 */
|
|
}
|
|
} else { /* round to -Inf */
|
|
if (s_hi) {
|
|
if (fp_result)
|
|
fgpr.dp[0]++; /* Z < 0, choose Z2 */
|
|
else
|
|
fgpr.wp[1]--; /* Z < 0, choose Z2 */
|
|
}
|
|
}
|
|
break;
|
|
|
|
case VCT:
|
|
if (FP_ROUNDMODE == FP_RND_PINF) {
|
|
if (lo_inexact && !s_lo)
|
|
fgpr.wp[1]++; /* Z_low > 0, choose Z1 */
|
|
if (hi_inexact && !s_hi)
|
|
fgpr.wp[0]++; /* Z_high word > 0, choose Z1 */
|
|
} else { /* round to -Inf */
|
|
if (lo_inexact && s_lo) {
|
|
if (fp_result)
|
|
fgpr.wp[1]++; /* Z_low < 0, choose Z2 */
|
|
else
|
|
fgpr.wp[1]--; /* Z_low < 0, choose Z2 */
|
|
}
|
|
if (hi_inexact && s_hi) {
|
|
if (fp_result)
|
|
fgpr.wp[0]++; /* Z_high < 0, choose Z2 */
|
|
else
|
|
fgpr.wp[0]--; /* Z_high < 0, choose Z2 */
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
current->thread.evr[fc] = fgpr.wp[0];
|
|
regs->gpr[fc] = fgpr.wp[1];
|
|
|
|
pr_debug(" to fgpr: %08x %08x\n", fgpr.wp[0], fgpr.wp[1]);
|
|
|
|
if (current->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
|
|
return (current->thread.fpexc_mode & PR_FP_EXC_RES) ? 1 : 0;
|
|
return 0;
|
|
}
|
|
|
|
int __init spe_mathemu_init(void)
|
|
{
|
|
u32 pvr, maj, min;
|
|
|
|
pvr = mfspr(SPRN_PVR);
|
|
|
|
if ((PVR_VER(pvr) == PVR_VER_E500V1) ||
|
|
(PVR_VER(pvr) == PVR_VER_E500V2)) {
|
|
maj = PVR_MAJ(pvr);
|
|
min = PVR_MIN(pvr);
|
|
|
|
/*
|
|
* E500 revision below 1.1, 2.3, 3.1, 4.1, 5.1
|
|
* need cpu a005 errata workaround
|
|
*/
|
|
switch (maj) {
|
|
case 1:
|
|
if (min < 1)
|
|
have_e500_cpu_a005_erratum = 1;
|
|
break;
|
|
case 2:
|
|
if (min < 3)
|
|
have_e500_cpu_a005_erratum = 1;
|
|
break;
|
|
case 3:
|
|
case 4:
|
|
case 5:
|
|
if (min < 1)
|
|
have_e500_cpu_a005_erratum = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(spe_mathemu_init);
|