math.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:12k
- /*
- * BK Id: SCCS/s.math.c 1.6 05/17/01 18:14:23 cort
- */
- /*
- * arch/ppc/math-emu/math.c
- *
- * Copyright (C) 1999 Eddie C. Dost (ecd@atecom.com)
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/sched.h>
- #include <asm/uaccess.h>
- #include <asm/processor.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 *)¤t->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 *)¤t->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 *)¤t->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 *)¤t->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 *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- op1 = (void *)¤t->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 *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- op1 = (void *)¤t->thread.fpr[(insn >> 16) & 0x1f];
- op2 = (void *)¤t->thread.fpr[(insn >> 11) & 0x1f];
- break;
- case AC:
- op0 = (void *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- op1 = (void *)¤t->thread.fpr[(insn >> 16) & 0x1f];
- op2 = (void *)¤t->thread.fpr[(insn >> 6) & 0x1f];
- break;
- case ABC:
- op0 = (void *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- op1 = (void *)¤t->thread.fpr[(insn >> 16) & 0x1f];
- op2 = (void *)¤t->thread.fpr[(insn >> 11) & 0x1f];
- op3 = (void *)¤t->thread.fpr[(insn >> 6) & 0x1f];
- break;
- case D:
- idx = (insn >> 16) & 0x1f;
- sdisp = (insn & 0xffff);
- op0 = (void *)¤t->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 *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- op1 = (void *)(regs->gpr[idx] + sdisp);
- break;
- case X:
- op0 = (void *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- break;
- case XA:
- op0 = (void *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- op1 = (void *)¤t->thread.fpr[(insn >> 16) & 0x1f];
- break;
- case XB:
- op0 = (void *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- op1 = (void *)¤t->thread.fpr[(insn >> 11) & 0x1f];
- break;
- case XE:
- idx = (insn >> 16) & 0x1f;
- if (!idx)
- goto illegal;
- op0 = (void *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
- break;
- case XEU:
- idx = (insn >> 16) & 0x1f;
- op0 = (void *)¤t->thread.fpr[(insn >> 21) & 0x1f];
- op1 = (void *)((idx ? regs->gpr[idx] : 0)
- + regs->gpr[(insn >> 11) & 0x1f]);
- break;
- case XCR:
- op0 = (void *)®s->ccr;
- op1 = (void *)((insn >> 23) & 0x7);
- op2 = (void *)¤t->thread.fpr[(insn >> 16) & 0x1f];
- op3 = (void *)¤t->thread.fpr[(insn >> 11) & 0x1f];
- break;
- case XCRL:
- op0 = (void *)®s->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 *)¤t->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;
- }