patch-2.1.79 linux/arch/sparc64/math-emu/math.c

• Lines: 210
• Date: Mon Jan 12 15:15:44 1998
• Orig file: v2.1.78/linux/arch/sparc64/math-emu/math.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.78/linux/arch/sparc64/math-emu/math.c linux/arch/sparc64/math-emu/math.c
@@ -0,0 +1,209 @@
+/* $Id: math.c,v 1.3 1997/10/15 07:28:55 jj Exp $
+ * arch/sparc64/math-emu/math.c
+ *
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ *
+ * Emulation routines originate from soft-fp package, which is part
+ * of glibc and has appropriate copyrights in it.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+
+#include <asm/fpumacro.h>
+#include <asm/ptrace.h>
+#include <asm/uaccess.h>
+
+#define FLOATFUNC(x) extern int x(void *,void *,void *);
+
+FLOATFUNC(FMOVQ)
+FLOATFUNC(FNEGQ)
+FLOATFUNC(FABSQ)
+FLOATFUNC(FSQRTQ)
+FLOATFUNC(FADDQ)
+FLOATFUNC(FSUBQ)
+FLOATFUNC(FMULQ)
+FLOATFUNC(FDIVQ)
+FLOATFUNC(FDMULQ)
+FLOATFUNC(FQTOX)
+FLOATFUNC(FXTOQ)
+FLOATFUNC(FQTOS)
+FLOATFUNC(FQTOD)
+FLOATFUNC(FITOQ)
+FLOATFUNC(FSTOQ)
+FLOATFUNC(FDTOQ)
+FLOATFUNC(FQTOI)
+FLOATFUNC(FCMPQ)
+FLOATFUNC(FCMPEQ)
+
+FLOATFUNC(FSQRTS)
+FLOATFUNC(FSQRTD)
+FLOATFUNC(FADDS)
+FLOATFUNC(FADDD)
+FLOATFUNC(FSUBS)
+FLOATFUNC(FSUBD)
+FLOATFUNC(FMULS)
+FLOATFUNC(FMULD)
+FLOATFUNC(FDIVS)
+FLOATFUNC(FDIVD)
+FLOATFUNC(FSMULD)
+FLOATFUNC(FSTOX)
+FLOATFUNC(FDTOX)
+FLOATFUNC(FDTOS)
+FLOATFUNC(FSTOD)
+FLOATFUNC(FSTOI)
+FLOATFUNC(FDTOI)
+
+int do_mathemu(struct pt_regs *regs, struct fpustate *f)
+{
+	unsigned long pc = regs->tpc;
+	unsigned long tstate = regs->tstate;
+	u32 insn = 0;
+	int type = 0; /* 01 is single, 10 is double, 11 is quad, 
+			 000011 is rs1, 001100 is rs2, 110000 is rd (00 in rd is fcc)
+			 111100000000 tells which ftt may that happen in */
+	int freg;
+	static u64 zero[2] = { 0L, 0L };
+	int flags;
+	int (*func)(void *,void *,void *) = NULL;
+
+	if(tstate & TSTATE_PRIV)
+		die_if_kernel("FPQuad from kernel", regs);
+	MOD_INC_USE_COUNT;
+	if(current->tss.flags & SPARC_FLAG_32BIT)
+		pc = (u32)pc;
+	if (get_user(insn, (u32 *)pc) != -EFAULT) {
+		if ((insn & 0xc1f80000) == 0x81a00000) /* FPOP1 */ {
+			switch ((insn >> 5) & 0x1ff) {
+			/* QUAD - ftt == 3 */
+			case 0x003: type = 0x33c; func = FMOVQ; break;
+			case 0x007: type = 0x33c; func = FNEGQ; break;
+			case 0x00b: type = 0x33c; func = FABSQ; break;
+			case 0x02b: type = 0x33c; func = FSQRTQ; break;
+			case 0x043: type = 0x33f; func = FADDQ; break;
+			case 0x047: type = 0x33f; func = FSUBQ; break;
+			case 0x04b: type = 0x33f; func = FMULQ; break;
+			case 0x04f: type = 0x33f; func = FDIVQ; break;
+			case 0x06e: type = 0x33a; func = FDMULQ; break;
+			case 0x083: type = 0x32c; func = FQTOX; break;
+			case 0x08c: type = 0x338; func = FXTOQ; break;
+			case 0x0c7: type = 0x31c; func = FQTOS; break;
+			case 0x0cb: type = 0x32c; func = FQTOD; break;
+			case 0x0cc: type = 0x334; func = FITOQ; break;
+			case 0x0cd: type = 0x334; func = FSTOQ; break;
+			case 0x0ce: type = 0x338; func = FDTOQ; break;
+			case 0x0d3: type = 0x31c; func = FQTOI; break;
+			/* SUBNORMAL - ftt == 2 */
+			case 0x029: type = 0x214; func = FSQRTS; break;
+			case 0x02a: type = 0x228; func = FSQRTD; break;
+			case 0x041: type = 0x215; func = FADDS; break;
+			case 0x042: type = 0x22a; func = FADDD; break;
+			case 0x045: type = 0x215; func = FSUBS; break;
+			case 0x046: type = 0x22a; func = FSUBD; break;
+			case 0x049: type = 0x215; func = FMULS; break;
+			case 0x04a: type = 0x22a; func = FMULD; break;
+			case 0x04d: type = 0x215; func = FDIVS; break;
+			case 0x04e: type = 0x22a; func = FDIVD; break;
+			case 0x069: type = 0x225; func = FSMULD; break;
+			case 0x081: type = 0x224; func = FSTOX; break;
+			case 0x082: type = 0x228; func = FDTOX; break;
+			case 0x0c6: type = 0x218; func = FDTOS; break;
+			case 0x0c9: type = 0x224; func = FSTOD; break;
+			case 0x0d1: type = 0x214; func = FSTOI; break;
+			case 0x0d2: type = 0x218; func = FDTOI; break;
+			}
+		}
+		else if ((insn & 0xc1f80000) == 0x81a80000) /* FPOP2 */ {
+			switch ((insn >> 5) & 0x1ff) {
+			case 0x053: type = 0x30f; func = FCMPQ; break;
+			case 0x057: type = 0x30f; func = FCMPEQ; break;
+			}
+		}
+	}
+	if (type) {
+		void *rs1 = NULL, *rs2 = NULL, *rd = NULL;
+		
+		freg = (f->fsr >> 14) & 0xf;
+		if (freg != (type >> 8))
+			goto err;
+		f->fsr &= ~0x1c000;
+		freg = ((insn >> 14) & 0x1f);
+		switch (type & 0x3) {
+		case 3: if (freg & 2) {
+				f->fsr |= (6 << 14) /* invalid_fp_register */;
+				goto err;
+			}
+		case 2: freg = ((freg & 1) << 5) | (freg & 0x1e);
+		case 1: rs1 = (void *)&f->regs[freg]; 
+			flags = (freg < 32) ? SPARC_FLAG_USEDFPUL : SPARC_FLAG_USEDFPUU; 
+			if (!(current->tss.flags & flags))
+			rs1 = (void *)&zero;
+			break;
+		}
+		freg = (insn & 0x1f);
+		switch ((type >> 2) & 0x3) {
+		case 3: if (freg & 2) {
+				f->fsr |= (6 << 14) /* invalid_fp_register */;
+				goto err;
+			}
+		case 2: freg = ((freg & 1) << 5) | (freg & 0x1e);
+		case 1: rs2 = (void *)&f->regs[freg];
+			flags = (freg < 32) ? SPARC_FLAG_USEDFPUL : SPARC_FLAG_USEDFPUU; 
+			if (!(current->tss.flags & flags))
+				rs2 = (void *)&zero;
+			break;
+		}
+		freg = ((insn >> 25) & 0x1f);
+		switch ((type >> 4) & 0x3) {
+		case 0: rd = (void *)(((long)&f->fsr) | (freg & 3)); break;
+		case 3: if (freg & 2) {
+				f->fsr |= (6 << 14) /* invalid_fp_register */;
+				goto err;
+			}
+		case 2: freg = ((freg & 1) << 5) | (freg & 0x1e);
+		case 1: rd = (void *)&f->regs[freg];
+			flags = (freg < 32) ? SPARC_FLAG_USEDFPUL : SPARC_FLAG_USEDFPUU; 
+			regs->fprs |= FPRS_FEF;
+			if (!(current->tss.flags & SPARC_FLAG_USEDFPU)) {
+				current->tss.flags |= SPARC_FLAG_USEDFPU;
+				f->fsr = 0;
+				f->gsr = 0;
+			}
+			if (!(current->tss.flags & flags)) {
+				if (freg < 32)
+					memset(f->regs, 0, 32*sizeof(u32));
+				else
+					memset(f->regs+32, 0, 32*sizeof(u32));
+			}
+			current->tss.flags |= flags;
+			break;
+		}
+		func(rd, rs2, rs1);
+		regs->tpc = regs->tnpc;
+		regs->tnpc += 4;
+		MOD_DEC_USE_COUNT;
+		return 1;
+	}
+err:	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Jakub Jelinek (jj@sunsite.mff.cuni.cz), Richard Henderson (rth@cygnus.com)");
+MODULE_DESCRIPTION("FPU emulation module");
+
+extern int (*handle_mathemu)(struct pt_regs *, struct fpustate *);
+
+int init_module(void)
+{
+	handle_mathemu = do_mathemu;
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	handle_mathemu = NULL;
+}
+#endif