[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / math-emu / math.c

/*
 * Copyright (C) 1999  Eddie C. Dost  (ecd@atecom.com)
 */

#include <linux/types.h>
#include <linux/sched.h>

#include <asm/uaccess.h>
#include <asm/reg.h>

#include "sfp-machine.h"
#include "double.h"

#define FLOATFUNC(x)	extern int x(void *, void *, void *, void *)

FLOATFUNC(fadd);
FLOATFUNC(fadds);
FLOATFUNC(fdiv);
FLOATFUNC(fdivs);
FLOATFUNC(fmul);
FLOATFUNC(fmuls);
FLOATFUNC(fsub);
FLOATFUNC(fsubs);

FLOATFUNC(fmadd);
FLOATFUNC(fmadds);
FLOATFUNC(fmsub);
FLOATFUNC(fmsubs);
FLOATFUNC(fnmadd);
FLOATFUNC(fnmadds);
FLOATFUNC(fnmsub);
FLOATFUNC(fnmsubs);

FLOATFUNC(fctiw);
FLOATFUNC(fctiwz);
FLOATFUNC(frsp);

FLOATFUNC(fcmpo);
FLOATFUNC(fcmpu);

FLOATFUNC(mcrfs);
FLOATFUNC(mffs);
FLOATFUNC(mtfsb0);
FLOATFUNC(mtfsb1);
FLOATFUNC(mtfsf);
FLOATFUNC(mtfsfi);

FLOATFUNC(lfd);
FLOATFUNC(lfs);

FLOATFUNC(stfd);
FLOATFUNC(stfs);
FLOATFUNC(stfiwx);

FLOATFUNC(fabs);
FLOATFUNC(fmr);
FLOATFUNC(fnabs);
FLOATFUNC(fneg);

/* Optional */
FLOATFUNC(fres);
FLOATFUNC(frsqrte);
FLOATFUNC(fsel);
FLOATFUNC(fsqrt);
FLOATFUNC(fsqrts);


#define OP31		0x1f		/*   31 */
#define LFS		0x30		/*   48 */
#define LFSU		0x31		/*   49 */
#define LFD		0x32		/*   50 */
#define LFDU		0x33		/*   51 */
#define STFS		0x34		/*   52 */
#define STFSU		0x35		/*   53 */
#define STFD		0x36		/*   54 */
#define STFDU		0x37		/*   55 */
#define OP59		0x3b		/*   59 */
#define OP63		0x3f		/*   63 */

/* Opcode 31: */
/* X-Form: */
#define LFSX		0x217		/*  535 */
#define LFSUX		0x237		/*  567 */
#define LFDX		0x257		/*  599 */
#define LFDUX		0x277		/*  631 */
#define STFSX		0x297		/*  663 */
#define STFSUX		0x2b7		/*  695 */
#define STFDX		0x2d7		/*  727 */
#define STFDUX		0x2f7		/*  759 */
#define STFIWX		0x3d7		/*  983 */

/* Opcode 59: */
/* A-Form: */
#define FDIVS		0x012		/*   18 */
#define FSUBS		0x014		/*   20 */
#define FADDS		0x015		/*   21 */
#define FSQRTS		0x016		/*   22 */
#define FRES		0x018		/*   24 */
#define FMULS		0x019		/*   25 */
#define FMSUBS		0x01c		/*   28 */
#define FMADDS		0x01d		/*   29 */
#define FNMSUBS		0x01e		/*   30 */
#define FNMADDS		0x01f		/*   31 */

/* Opcode 63: */
/* A-Form: */
#define FDIV		0x012		/*   18 */
#define FSUB		0x014		/*   20 */
#define FADD		0x015		/*   21 */
#define FSQRT		0x016		/*   22 */
#define FSEL		0x017		/*   23 */
#define FMUL		0x019		/*   25 */
#define FRSQRTE		0x01a		/*   26 */
#define FMSUB		0x01c		/*   28 */
#define FMADD		0x01d		/*   29 */
#define FNMSUB		0x01e		/*   30 */
#define FNMADD		0x01f		/*   31 */

/* X-Form: */
#define FCMPU		0x000		/*    0	*/
#define FRSP		0x00c		/*   12 */
#define FCTIW		0x00e		/*   14 */
#define FCTIWZ		0x00f		/*   15 */
#define FCMPO		0x020		/*   32 */
#define MTFSB1		0x026		/*   38 */
#define FNEG		0x028		/*   40 */
#define MCRFS		0x040		/*   64 */
#define MTFSB0		0x046		/*   70 */
#define FMR		0x048		/*   72 */
#define MTFSFI		0x086		/*  134 */
#define FNABS		0x088		/*  136 */
#define FABS		0x108		/*  264 */
#define MFFS		0x247		/*  583 */
#define MTFSF		0x2c7		/*  711 */


#define AB	2
#define AC	3
#define ABC	4
#define D	5
#define DU	6
#define X	7
#define XA	8
#define XB	9
#define XCR	11
#define XCRB	12
#define XCRI	13
#define XCRL	16
#define XE	14
#define XEU	15
#define XFLB	10

#ifdef CONFIG_MATH_EMULATION
static int
record_exception(struct pt_regs *regs, int eflag)
{
	u32 fpscr;

	fpscr = __FPU_FPSCR;

	if (eflag) {
		fpscr |= FPSCR_FX;
		if (eflag & EFLAG_OVERFLOW)
			fpscr |= FPSCR_OX;
		if (eflag & EFLAG_UNDERFLOW)
			fpscr |= FPSCR_UX;
		if (eflag & EFLAG_DIVZERO)
			fpscr |= FPSCR_ZX;
		if (eflag & EFLAG_INEXACT)
			fpscr |= FPSCR_XX;
		if (eflag & EFLAG_VXSNAN)
			fpscr |= FPSCR_VXSNAN;
		if (eflag & EFLAG_VXISI)
			fpscr |= FPSCR_VXISI;
		if (eflag & EFLAG_VXIDI)
			fpscr |= FPSCR_VXIDI;
		if (eflag & EFLAG_VXZDZ)
			fpscr |= FPSCR_VXZDZ;
		if (eflag & EFLAG_VXIMZ)
			fpscr |= FPSCR_VXIMZ;
		if (eflag & EFLAG_VXVC)
			fpscr |= FPSCR_VXVC;
		if (eflag & EFLAG_VXSOFT)
			fpscr |= FPSCR_VXSOFT;
		if (eflag & EFLAG_VXSQRT)
			fpscr |= FPSCR_VXSQRT;
		if (eflag & EFLAG_VXCVI)
			fpscr |= FPSCR_VXCVI;
	}

	fpscr &= ~(FPSCR_VX);
	if (fpscr & (FPSCR_VXSNAN | FPSCR_VXISI | FPSCR_VXIDI |
		     FPSCR_VXZDZ | FPSCR_VXIMZ | FPSCR_VXVC |
		     FPSCR_VXSOFT | FPSCR_VXSQRT | FPSCR_VXCVI))
		fpscr |= FPSCR_VX;

	fpscr &= ~(FPSCR_FEX);
	if (((fpscr & FPSCR_VX) && (fpscr & FPSCR_VE)) ||
	    ((fpscr & FPSCR_OX) && (fpscr & FPSCR_OE)) ||
	    ((fpscr & FPSCR_UX) && (fpscr & FPSCR_UE)) ||
	    ((fpscr & FPSCR_ZX) && (fpscr & FPSCR_ZE)) ||
	    ((fpscr & FPSCR_XX) && (fpscr & FPSCR_XE)))
		fpscr |= FPSCR_FEX;

	__FPU_FPSCR = fpscr;

	return (fpscr & FPSCR_FEX) ? 1 : 0;
}
#endif /* CONFIG_MATH_EMULATION */

int
do_mathemu(struct pt_regs *regs)
{
	void *op0 = 0, *op1 = 0, *op2 = 0, *op3 = 0;
	unsigned long pc = regs->nip;
	signed short sdisp;
	u32 insn = 0;
	int idx = 0;
#ifdef CONFIG_MATH_EMULATION
	int (*func)(void *, void *, void *, void *);
	int type = 0;
	int eflag, trap;
#endif

	if (get_user(insn, (u32 *)pc))
		return -EFAULT;

#ifndef CONFIG_MATH_EMULATION
	switch (insn >> 26) {
	case LFD:
		idx = (insn >> 16) & 0x1f;
		sdisp = (insn & 0xffff);
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
		lfd(op0, op1, op2, op3);
		break;
	case LFDU:
		idx = (insn >> 16) & 0x1f;
		sdisp = (insn & 0xffff);
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
		lfd(op0, op1, op2, op3);
		regs->gpr[idx] = (unsigned long)op1;
		break;
	case STFD:
		idx = (insn >> 16) & 0x1f;
		sdisp = (insn & 0xffff);
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
		stfd(op0, op1, op2, op3);
		break;
	case STFDU:
		idx = (insn >> 16) & 0x1f;
		sdisp = (insn & 0xffff);
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
		stfd(op0, op1, op2, op3);
		regs->gpr[idx] = (unsigned long)op1;
		break;
	case OP63:
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
		fmr(op0, op1, op2, op3);
		break;
	default:
		goto illegal;
	}
#else /* CONFIG_MATH_EMULATION */
	switch (insn >> 26) {
	case LFS:	func = lfs;	type = D;	break;
	case LFSU:	func = lfs;	type = DU;	break;
	case LFD:	func = lfd;	type = D;	break;
	case LFDU:	func = lfd;	type = DU;	break;
	case STFS:	func = stfs;	type = D;	break;
	case STFSU:	func = stfs;	type = DU;	break;
	case STFD:	func = stfd;	type = D;	break;
	case STFDU:	func = stfd;	type = DU;	break;

	case OP31:
		switch ((insn >> 1) & 0x3ff) {
		case LFSX:	func = lfs;	type = XE;	break;
		case LFSUX:	func = lfs;	type = XEU;	break;
		case LFDX:	func = lfd;	type = XE;	break;
		case LFDUX:	func = lfd;	type = XEU;	break;
		case STFSX:	func = stfs;	type = XE;	break;
		case STFSUX:	func = stfs;	type = XEU;	break;
		case STFDX:	func = stfd;	type = XE;	break;
		case STFDUX:	func = stfd;	type = XEU;	break;
		case STFIWX:	func = stfiwx;	type = XE;	break;
		default:
			goto illegal;
		}
		break;

	case OP59:
		switch ((insn >> 1) & 0x1f) {
		case FDIVS:	func = fdivs;	type = AB;	break;
		case FSUBS:	func = fsubs;	type = AB;	break;
		case FADDS:	func = fadds;	type = AB;	break;
		case FSQRTS:	func = fsqrts;	type = AB;	break;
		case FRES:	func = fres;	type = AB;	break;
		case FMULS:	func = fmuls;	type = AC;	break;
		case FMSUBS:	func = fmsubs;	type = ABC;	break;
		case FMADDS:	func = fmadds;	type = ABC;	break;
		case FNMSUBS:	func = fnmsubs;	type = ABC;	break;
		case FNMADDS:	func = fnmadds;	type = ABC;	break;
		default:
			goto illegal;
		}
		break;

	case OP63:
		if (insn & 0x20) {
			switch ((insn >> 1) & 0x1f) {
			case FDIV:	func = fdiv;	type = AB;	break;
			case FSUB:	func = fsub;	type = AB;	break;
			case FADD:	func = fadd;	type = AB;	break;
			case FSQRT:	func = fsqrt;	type = AB;	break;
			case FSEL:	func = fsel;	type = ABC;	break;
			case FMUL:	func = fmul;	type = AC;	break;
			case FRSQRTE:	func = frsqrte;	type = AB;	break;
			case FMSUB:	func = fmsub;	type = ABC;	break;
			case FMADD:	func = fmadd;	type = ABC;	break;
			case FNMSUB:	func = fnmsub;	type = ABC;	break;
			case FNMADD:	func = fnmadd;	type = ABC;	break;
			default:
				goto illegal;
			}
			break;
		}

		switch ((insn >> 1) & 0x3ff) {
		case FCMPU:	func = fcmpu;	type = XCR;	break;
		case FRSP:	func = frsp;	type = XB;	break;
		case FCTIW:	func = fctiw;	type = XB;	break;
		case FCTIWZ:	func = fctiwz;	type = XB;	break;
		case FCMPO:	func = fcmpo;	type = XCR;	break;
		case MTFSB1:	func = mtfsb1;	type = XCRB;	break;
		case FNEG:	func = fneg;	type = XB;	break;
		case MCRFS:	func = mcrfs;	type = XCRL;	break;
		case MTFSB0:	func = mtfsb0;	type = XCRB;	break;
		case FMR:	func = fmr;	type = XB;	break;
		case MTFSFI:	func = mtfsfi;	type = XCRI;	break;
		case FNABS:	func = fnabs;	type = XB;	break;
		case FABS:	func = fabs;	type = XB;	break;
		case MFFS:	func = mffs;	type = X;	break;
		case MTFSF:	func = mtfsf;	type = XFLB;	break;
		default:
			goto illegal;
		}
		break;

	default:
		goto illegal;
	}

	switch (type) {
	case AB:
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
		op2 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
		break;

	case AC:
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
		op2 = (void *)&current->thread.fpr[(insn >>  6) & 0x1f];
		break;

	case ABC:
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
		op2 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
		op3 = (void *)&current->thread.fpr[(insn >>  6) & 0x1f];
		break;

	case D:
		idx = (insn >> 16) & 0x1f;
		sdisp = (insn & 0xffff);
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
		break;

	case DU:
		idx = (insn >> 16) & 0x1f;
		if (!idx)
			goto illegal;

		sdisp = (insn & 0xffff);
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)(regs->gpr[idx] + sdisp);
		break;

	case X:
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		break;

	case XA:
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
		break;

	case XB:
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
		break;

	case XE:
		idx = (insn >> 16) & 0x1f;
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		if (!idx) {
			if (((insn >> 1) & 0x3ff) == STFIWX)
				op1 = (void *)(regs->gpr[(insn >> 11) & 0x1f]);
			else
				goto illegal;
		} else {
			op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
		}

		break;

	case XEU:
		idx = (insn >> 16) & 0x1f;
		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
		op1 = (void *)((idx ? regs->gpr[idx] : 0)
				+ regs->gpr[(insn >> 11) & 0x1f]);
		break;

	case XCR:
		op0 = (void *)&regs->ccr;
		op1 = (void *)((insn >> 23) & 0x7);
		op2 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
		op3 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
		break;

	case XCRL:
		op0 = (void *)&regs->ccr;
		op1 = (void *)((insn >> 23) & 0x7);
		op2 = (void *)((insn >> 18) & 0x7);
		break;

	case XCRB:
		op0 = (void *)((insn >> 21) & 0x1f);
		break;

	case XCRI:
		op0 = (void *)((insn >> 23) & 0x7);
		op1 = (void *)((insn >> 12) & 0xf);
		break;

	case XFLB:
		op0 = (void *)((insn >> 17) & 0xff);
		op1 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
		break;

	default:
		goto illegal;
	}

	eflag = func(op0, op1, op2, op3);

	if (insn & 1) {
		regs->ccr &= ~(0x0f000000);
		regs->ccr |= (__FPU_FPSCR >> 4) & 0x0f000000;
	}

	trap = record_exception(regs, eflag);
	if (trap)
		return 1;

	switch (type) {
	case DU:
	case XEU:
		regs->gpr[idx] = (unsigned long)op1;
		break;

	default:
		break;
	}
#endif /* CONFIG_MATH_EMULATION */

	regs->nip += 4;
	return 0;

illegal:
	return -ENOSYS;
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Copyright (C) 1999 Eddie C. Dost (ecd@atecom.com)
	3	*/
	4
1da177e4 LT	5	#include <linux/types.h>
	6	#include <linux/sched.h>
	7
	8	#include <asm/uaccess.h>
	9	#include <asm/reg.h>
	10
	11	#include "sfp-machine.h"
	12	#include "double.h"
	13
	14	#define FLOATFUNC(x) extern int x(void , void , void , void )
	15
	16	FLOATFUNC(fadd);
	17	FLOATFUNC(fadds);
	18	FLOATFUNC(fdiv);
	19	FLOATFUNC(fdivs);
	20	FLOATFUNC(fmul);
	21	FLOATFUNC(fmuls);
	22	FLOATFUNC(fsub);
	23	FLOATFUNC(fsubs);
	24
	25	FLOATFUNC(fmadd);
	26	FLOATFUNC(fmadds);
	27	FLOATFUNC(fmsub);
	28	FLOATFUNC(fmsubs);
	29	FLOATFUNC(fnmadd);
	30	FLOATFUNC(fnmadds);
	31	FLOATFUNC(fnmsub);
	32	FLOATFUNC(fnmsubs);
	33
	34	FLOATFUNC(fctiw);
	35	FLOATFUNC(fctiwz);
	36	FLOATFUNC(frsp);
	37
	38	FLOATFUNC(fcmpo);
	39	FLOATFUNC(fcmpu);
	40
	41	FLOATFUNC(mcrfs);
	42	FLOATFUNC(mffs);
	43	FLOATFUNC(mtfsb0);
	44	FLOATFUNC(mtfsb1);
	45	FLOATFUNC(mtfsf);
	46	FLOATFUNC(mtfsfi);
	47
	48	FLOATFUNC(lfd);
	49	FLOATFUNC(lfs);
	50
	51	FLOATFUNC(stfd);
	52	FLOATFUNC(stfs);
	53	FLOATFUNC(stfiwx);
	54
	55	FLOATFUNC(fabs);
	56	FLOATFUNC(fmr);
	57	FLOATFUNC(fnabs);
	58	FLOATFUNC(fneg);
	59
	60	/* Optional */
	61	FLOATFUNC(fres);
	62	FLOATFUNC(frsqrte);
	63	FLOATFUNC(fsel);
	64	FLOATFUNC(fsqrt);
	65	FLOATFUNC(fsqrts);
	66
	67
	68	#define OP31 0x1f /* 31 */
69	#define LFS 0x30 /* 48 */
70	#define LFSU 0x31 /* 49 */
71	#define LFD 0x32 /* 50 */
72	#define LFDU 0x33 /* 51 */
73	#define STFS 0x34 /* 52 */
74	#define STFSU 0x35 /* 53 */
75	#define STFD 0x36 /* 54 */
76	#define STFDU 0x37 /* 55 */
77	#define OP59 0x3b /* 59 */
78	#define OP63 0x3f /* 63 */
79
80	/* Opcode 31: */
81	/* X-Form: */
82	#define LFSX 0x217 /* 535 */
83	#define LFSUX 0x237 /* 567 */
84	#define LFDX 0x257 /* 599 */
85	#define LFDUX 0x277 /* 631 */
86	#define STFSX 0x297 /* 663 */
87	#define STFSUX 0x2b7 /* 695 */
88	#define STFDX 0x2d7 /* 727 */
89	#define STFDUX 0x2f7 /* 759 */
90	#define STFIWX 0x3d7 /* 983 */
91
92	/* Opcode 59: */
93	/* A-Form: */
94	#define FDIVS 0x012 /* 18 */
95	#define FSUBS 0x014 /* 20 */
96	#define FADDS 0x015 /* 21 */
97	#define FSQRTS 0x016 /* 22 */
98	#define FRES 0x018 /* 24 */
99	#define FMULS 0x019 /* 25 */
100	#define FMSUBS 0x01c /* 28 */
101	#define FMADDS 0x01d /* 29 */
102	#define FNMSUBS 0x01e /* 30 */
103	#define FNMADDS 0x01f /* 31 */
104
105	/* Opcode 63: */
106	/* A-Form: */
107	#define FDIV 0x012 /* 18 */
108	#define FSUB 0x014 /* 20 */
109	#define FADD 0x015 /* 21 */
110	#define FSQRT 0x016 /* 22 */
111	#define FSEL 0x017 /* 23 */
112	#define FMUL 0x019 /* 25 */
113	#define FRSQRTE 0x01a /* 26 */
114	#define FMSUB 0x01c /* 28 */
115	#define FMADD 0x01d /* 29 */
116	#define FNMSUB 0x01e /* 30 */
117	#define FNMADD 0x01f /* 31 */
118
119	/* X-Form: */
120	#define FCMPU 0x000 /* 0 */
121	#define FRSP 0x00c /* 12 */
122	#define FCTIW 0x00e /* 14 */
123	#define FCTIWZ 0x00f /* 15 */
124	#define FCMPO 0x020 /* 32 */
125	#define MTFSB1 0x026 /* 38 */
126	#define FNEG 0x028 /* 40 */
127	#define MCRFS 0x040 /* 64 */
128	#define MTFSB0 0x046 /* 70 */
129	#define FMR 0x048 /* 72 */
130	#define MTFSFI 0x086 /* 134 */
131	#define FNABS 0x088 /* 136 */
132	#define FABS 0x108 /* 264 */
133	#define MFFS 0x247 /* 583 */
134	#define MTFSF 0x2c7 /* 711 */
135
136
137	#define AB 2
138	#define AC 3
139	#define ABC 4
140	#define D 5
141	#define DU 6
142	#define X 7
143	#define XA 8
144	#define XB 9
145	#define XCR 11
146	#define XCRB 12
147	#define XCRI 13
148	#define XCRL 16
149	#define XE 14
150	#define XEU 15
151	#define XFLB 10
152
153	#ifdef CONFIG_MATH_EMULATION
154	static int
155	record_exception(struct pt_regs *regs, int eflag)
156	{
157	u32 fpscr;
158
159	fpscr = __FPU_FPSCR;
160
161	if (eflag) {
162	fpscr \|= FPSCR_FX;
163	if (eflag & EFLAG_OVERFLOW)
164	fpscr \|= FPSCR_OX;
165	if (eflag & EFLAG_UNDERFLOW)
166	fpscr \|= FPSCR_UX;
167	if (eflag & EFLAG_DIVZERO)
168	fpscr \|= FPSCR_ZX;
169	if (eflag & EFLAG_INEXACT)
170	fpscr \|= FPSCR_XX;
171	if (eflag & EFLAG_VXSNAN)
172	fpscr \|= FPSCR_VXSNAN;
173	if (eflag & EFLAG_VXISI)
174	fpscr \|= FPSCR_VXISI;
175	if (eflag & EFLAG_VXIDI)
176	fpscr \|= FPSCR_VXIDI;
177	if (eflag & EFLAG_VXZDZ)
178	fpscr \|= FPSCR_VXZDZ;
179	if (eflag & EFLAG_VXIMZ)
180	fpscr \|= FPSCR_VXIMZ;
181	if (eflag & EFLAG_VXVC)
182	fpscr \|= FPSCR_VXVC;
183	if (eflag & EFLAG_VXSOFT)
184	fpscr \|= FPSCR_VXSOFT;
185	if (eflag & EFLAG_VXSQRT)
186	fpscr \|= FPSCR_VXSQRT;
187	if (eflag & EFLAG_VXCVI)
188	fpscr \|= FPSCR_VXCVI;
189	}
190
191	fpscr &= ~(FPSCR_VX);
192	if (fpscr & (FPSCR_VXSNAN \| FPSCR_VXISI \| FPSCR_VXIDI \|
193	FPSCR_VXZDZ \| FPSCR_VXIMZ \| FPSCR_VXVC \|
194	FPSCR_VXSOFT \| FPSCR_VXSQRT \| FPSCR_VXCVI))
195	fpscr \|= FPSCR_VX;
196
197	fpscr &= ~(FPSCR_FEX);
198	if (((fpscr & FPSCR_VX) && (fpscr & FPSCR_VE)) \|\|
199	((fpscr & FPSCR_OX) && (fpscr & FPSCR_OE)) \|\|
200	((fpscr & FPSCR_UX) && (fpscr & FPSCR_UE)) \|\|
201	((fpscr & FPSCR_ZX) && (fpscr & FPSCR_ZE)) \|\|
202	((fpscr & FPSCR_XX) && (fpscr & FPSCR_XE)))
203	fpscr \|= FPSCR_FEX;
204
205	__FPU_FPSCR = fpscr;
206
207	return (fpscr & FPSCR_FEX) ? 1 : 0;
208	}
209	#endif /* CONFIG_MATH_EMULATION */
210
211	int
212	do_mathemu(struct pt_regs *regs)
213	{
214	void op0 = 0, op1 = 0, op2 = 0, op3 = 0;
215	unsigned long pc = regs->nip;
216	signed short sdisp;
217	u32 insn = 0;
218	int idx = 0;
219	#ifdef CONFIG_MATH_EMULATION
220	int (func)(void , void , void , void *);
221	int type = 0;
222	int eflag, trap;
223	#endif
224
225	if (get_user(insn, (u32 *)pc))
226	return -EFAULT;
227
228	#ifndef CONFIG_MATH_EMULATION
229	switch (insn >> 26) {
230	case LFD:
231	idx = (insn >> 16) & 0x1f;
232	sdisp = (insn & 0xffff);
233	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
234	op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
235	lfd(op0, op1, op2, op3);
236	break;
237	case LFDU:
238	idx = (insn >> 16) & 0x1f;
239	sdisp = (insn & 0xffff);
240	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
241	op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
242	lfd(op0, op1, op2, op3);
243	regs->gpr[idx] = (unsigned long)op1;
244	break;
245	case STFD:
246	idx = (insn >> 16) & 0x1f;
247	sdisp = (insn & 0xffff);
248	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
249	op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
250	stfd(op0, op1, op2, op3);
251	break;
252	case STFDU:
253	idx = (insn >> 16) & 0x1f;
254	sdisp = (insn & 0xffff);
255	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
256	op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
257	stfd(op0, op1, op2, op3);
258	regs->gpr[idx] = (unsigned long)op1;
259	break;
260	case OP63:
261	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
262	op1 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
263	fmr(op0, op1, op2, op3);
264	break;
265	default:
266	goto illegal;
267	}
268	#else /* CONFIG_MATH_EMULATION */
269	switch (insn >> 26) {
270	case LFS: func = lfs; type = D; break;
271	case LFSU: func = lfs; type = DU; break;
272	case LFD: func = lfd; type = D; break;
273	case LFDU: func = lfd; type = DU; break;
274	case STFS: func = stfs; type = D; break;
275	case STFSU: func = stfs; type = DU; break;
276	case STFD: func = stfd; type = D; break;
277	case STFDU: func = stfd; type = DU; break;
278
279	case OP31:
280	switch ((insn >> 1) & 0x3ff) {
281	case LFSX: func = lfs; type = XE; break;
282	case LFSUX: func = lfs; type = XEU; break;
283	case LFDX: func = lfd; type = XE; break;
284	case LFDUX: func = lfd; type = XEU; break;
285	case STFSX: func = stfs; type = XE; break;
286	case STFSUX: func = stfs; type = XEU; break;
287	case STFDX: func = stfd; type = XE; break;
288	case STFDUX: func = stfd; type = XEU; break;
289	case STFIWX: func = stfiwx; type = XE; break;
290	default:
291	goto illegal;
292	}
293	break;
294
295	case OP59:
296	switch ((insn >> 1) & 0x1f) {
297	case FDIVS: func = fdivs; type = AB; break;
298	case FSUBS: func = fsubs; type = AB; break;
299	case FADDS: func = fadds; type = AB; break;
300	case FSQRTS: func = fsqrts; type = AB; break;
301	case FRES: func = fres; type = AB; break;
302	case FMULS: func = fmuls; type = AC; break;
303	case FMSUBS: func = fmsubs; type = ABC; break;
304	case FMADDS: func = fmadds; type = ABC; break;
305	case FNMSUBS: func = fnmsubs; type = ABC; break;
306	case FNMADDS: func = fnmadds; type = ABC; break;
307	default:
308	goto illegal;
309	}
310	break;
311
312	case OP63:
313	if (insn & 0x20) {
314	switch ((insn >> 1) & 0x1f) {
315	case FDIV: func = fdiv; type = AB; break;
316	case FSUB: func = fsub; type = AB; break;
317	case FADD: func = fadd; type = AB; break;
318	case FSQRT: func = fsqrt; type = AB; break;
319	case FSEL: func = fsel; type = ABC; break;
320	case FMUL: func = fmul; type = AC; break;
321	case FRSQRTE: func = frsqrte; type = AB; break;
322	case FMSUB: func = fmsub; type = ABC; break;
323	case FMADD: func = fmadd; type = ABC; break;
324	case FNMSUB: func = fnmsub; type = ABC; break;
325	case FNMADD: func = fnmadd; type = ABC; break;
326	default:
327	goto illegal;
328	}
329	break;
330	}
331
332	switch ((insn >> 1) & 0x3ff) {
333	case FCMPU: func = fcmpu; type = XCR; break;
334	case FRSP: func = frsp; type = XB; break;
335	case FCTIW: func = fctiw; type = XB; break;
336	case FCTIWZ: func = fctiwz; type = XB; break;
337	case FCMPO: func = fcmpo; type = XCR; break;
338	case MTFSB1: func = mtfsb1; type = XCRB; break;
339	case FNEG: func = fneg; type = XB; break;
340	case MCRFS: func = mcrfs; type = XCRL; break;
341	case MTFSB0: func = mtfsb0; type = XCRB; break;
342	case FMR: func = fmr; type = XB; break;
343	case MTFSFI: func = mtfsfi; type = XCRI; break;
344	case FNABS: func = fnabs; type = XB; break;
345	case FABS: func = fabs; type = XB; break;
346	case MFFS: func = mffs; type = X; break;
347	case MTFSF: func = mtfsf; type = XFLB; break;
348	default:
349	goto illegal;
350	}
351	break;
352
353	default:
354	goto illegal;
355	}
356
357	switch (type) {
358	case AB:
359	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
360	op1 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
361	op2 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
362	break;
363
364	case AC:
365	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
366	op1 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
367	op2 = (void *)&current->thread.fpr[(insn >> 6) & 0x1f];
368	break;
369
370	case ABC:
371	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
372	op1 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
373	op2 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
374	op3 = (void *)&current->thread.fpr[(insn >> 6) & 0x1f];
375	break;
376
377	case D:
378	idx = (insn >> 16) & 0x1f;
379	sdisp = (insn & 0xffff);
380	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
381	op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
382	break;
383
384	case DU:
385	idx = (insn >> 16) & 0x1f;
386	if (!idx)
387	goto illegal;
388
389	sdisp = (insn & 0xffff);
390	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
391	op1 = (void *)(regs->gpr[idx] + sdisp);
392	break;
393
394	case X:
395	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
396	break;
397
398	case XA:
399	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
400	op1 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
401	break;
402
403	case XB:
404	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
405	op1 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
406	break;
407
408	case XE:
409	idx = (insn >> 16) & 0x1f;
1da177e4	410	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
ba02946a KG	411	if (!idx) {
	412	if (((insn >> 1) & 0x3ff) == STFIWX)
	413	op1 = (void *)(regs->gpr[(insn >> 11) & 0x1f]);
	414	else
	415	goto illegal;
	416	} else {
	417	op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
	418	}
	419
1da177e4 LT	420	break;
	421
	422	case XEU:
	423	idx = (insn >> 16) & 0x1f;
	424	op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
	425	op1 = (void *)((idx ? regs->gpr[idx] : 0)
	426	+ regs->gpr[(insn >> 11) & 0x1f]);
	427	break;
	428
	429	case XCR:
	430	op0 = (void *)&regs->ccr;
	431	op1 = (void *)((insn >> 23) & 0x7);
	432	op2 = (void *)&current->thread.fpr[(insn >> 16) & 0x1f];
	433	op3 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
	434	break;
	435
	436	case XCRL:
	437	op0 = (void *)&regs->ccr;
	438	op1 = (void *)((insn >> 23) & 0x7);
	439	op2 = (void *)((insn >> 18) & 0x7);
	440	break;
	441
	442	case XCRB:
	443	op0 = (void *)((insn >> 21) & 0x1f);
	444	break;
	445
	446	case XCRI:
	447	op0 = (void *)((insn >> 23) & 0x7);
	448	op1 = (void *)((insn >> 12) & 0xf);
	449	break;
	450
	451	case XFLB:
	452	op0 = (void *)((insn >> 17) & 0xff);
	453	op1 = (void *)&current->thread.fpr[(insn >> 11) & 0x1f];
	454	break;
	455
	456	default:
	457	goto illegal;
	458	}
	459
	460	eflag = func(op0, op1, op2, op3);
	461
	462	if (insn & 1) {
	463	regs->ccr &= ~(0x0f000000);
	464	regs->ccr \|= (__FPU_FPSCR >> 4) & 0x0f000000;
	465	}
	466
	467	trap = record_exception(regs, eflag);
	468	if (trap)
	469	return 1;
	470
	471	switch (type) {
	472	case DU:
	473	case XEU:
	474	regs->gpr[idx] = (unsigned long)op1;
	475	break;
	476
	477	default:
	478	break;
	479	}
	480	#endif /* CONFIG_MATH_EMULATION */
	481
	482	regs->nip += 4;
	483	return 0;
484
485	illegal:
486	return -ENOSYS;
487	}