Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 521 insertions, 0 deletions

diff --git a/arch/sparc/math-emu/math.c b/arch/sparc/math-emu/math.c
new file mode 100644
index 000000000000..be2c80932e26
--- /dev/null
+++ b/arch/sparc/math-emu/math.c
@@ -0,0 +1,521 @@
+/*
+ * arch/sparc/math-emu/math.c
+ *
+ * Copyright (C) 1998 Peter Maydell (pmaydell@chiark.greenend.org.uk)
+ * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz)
+ * Copyright (C) 1999 David S. Miller (davem@redhat.com)
+ *
+ * This is a good place to start if you're trying to understand the
+ * emulation code, because it's pretty simple. What we do is
+ * essentially analyse the instruction to work out what the operation
+ * is and which registers are involved. We then execute the appropriate
+ * FXXXX function. [The floating point queue introduces a minor wrinkle;
+ * see below...]
+ * The fxxxxx.c files each emulate a single insn. They look relatively
+ * simple because the complexity is hidden away in an unholy tangle
+ * of preprocessor macros.
+ *
+ * The first layer of macros is single.h, double.h, quad.h. Generally
+ * these files define macros for working with floating point numbers
+ * of the three IEEE formats. FP_ADD_D(R,A,B) is for adding doubles,
+ * for instance. These macros are usually defined as calls to more
+ * generic macros (in this case _FP_ADD(D,2,R,X,Y) where the number
+ * of machine words required to store the given IEEE format is passed
+ * as a parameter. [double.h and co check the number of bits in a word
+ * and define FP_ADD_D & co appropriately].
+ * The generic macros are defined in op-common.h. This is where all
+ * the grotty stuff like handling NaNs is coded. To handle the possible
+ * word sizes macros in op-common.h use macros like _FP_FRAC_SLL_##wc()
+ * where wc is the 'number of machine words' parameter (here 2).
+ * These are defined in the third layer of macros: op-1.h, op-2.h
+ * and op-4.h. These handle operations on floating point numbers composed
+ * of 1,2 and 4 machine words respectively. [For example, on sparc64
+ * doubles are one machine word so macros in double.h eventually use
+ * constructs in op-1.h, but on sparc32 they use op-2.h definitions.]
+ * soft-fp.h is on the same level as op-common.h, and defines some
+ * macros which are independent of both word size and FP format.
+ * Finally, sfp-machine.h is the machine dependent part of the
+ * code: it defines the word size and what type a word is. It also
+ * defines how _FP_MUL_MEAT_t() maps to _FP_MUL_MEAT_n_* : op-n.h
+ * provide several possible flavours of multiply algorithm, most
+ * of which require that you supply some form of asm or C primitive to
+ * do the actual multiply. (such asm primitives should be defined
+ * in sfp-machine.h too). udivmodti4.c is the same sort of thing.
+ *
+ * There may be some errors here because I'm working from a
+ * SPARC architecture manual V9, and what I really want is V8...
+ * Also, the insns which can generate exceptions seem to be a
+ * greater subset of the FPops than for V9 (for example, FCMPED
+ * has to be emulated on V8). So I think I'm going to have
+ * to emulate them all just to be on the safe side...
+ *
+ * Emulation routines originate from soft-fp package, which is
+ * part of glibc and has appropriate copyrights in it (allegedly).
+ *
+ * NB: on sparc int == long == 4 bytes, long long == 8 bytes.
+ * Most bits of the kernel seem to go for long rather than int,
+ * so we follow that practice...
+ */
+
+/* TODO:
+ * fpsave() saves the FP queue but fpload() doesn't reload it.
+ * Therefore when we context switch or change FPU ownership
+ * we have to check to see if the queue had anything in it and
+ * emulate it if it did. This is going to be a pain.
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <asm/uaccess.h>
+
+#include "sfp-util.h"
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+#include <math-emu/double.h>
+#include <math-emu/quad.h>
+
+#define FLOATFUNC(x) extern int x(void *,void *,void *)
+
+/* The Vn labels indicate what version of the SPARC architecture gas thinks
+ * each insn is. This is from the binutils source :->
+ */
+/* quadword instructions */
+#define FSQRTQ  0x02b           /* v8 */
+#define FADDQ   0x043           /* v8 */
+#define FSUBQ   0x047           /* v8 */
+#define FMULQ   0x04b           /* v8 */
+#define FDIVQ   0x04f           /* v8 */
+#define FDMULQ  0x06e           /* v8 */
+#define FQTOS   0x0c7           /* v8 */
+#define FQTOD   0x0cb           /* v8 */
+#define FITOQ   0x0cc           /* v8 */
+#define FSTOQ   0x0cd           /* v8 */
+#define FDTOQ   0x0ce           /* v8 */
+#define FQTOI   0x0d3           /* v8 */
+#define FCMPQ   0x053           /* v8 */
+#define FCMPEQ  0x057           /* v8 */
+/* single/double instructions (subnormal): should all work */
+#define FSQRTS  0x029           /* v7 */
+#define FSQRTD  0x02a           /* v7 */
+#define FADDS   0x041           /* v6 */
+#define FADDD   0x042           /* v6 */
+#define FSUBS   0x045           /* v6 */
+#define FSUBD   0x046           /* v6 */
+#define FMULS   0x049           /* v6 */
+#define FMULD   0x04a           /* v6 */
+#define FDIVS   0x04d           /* v6 */
+#define FDIVD   0x04e           /* v6 */
+#define FSMULD  0x069           /* v6 */
+#define FDTOS   0x0c6           /* v6 */
+#define FSTOD   0x0c9           /* v6 */
+#define FSTOI   0x0d1           /* v6 */
+#define FDTOI   0x0d2           /* v6 */
+#define FABSS   0x009           /* v6 */
+#define FCMPS   0x051           /* v6 */
+#define FCMPES  0x055           /* v6 */
+#define FCMPD   0x052           /* v6 */
+#define FCMPED  0x056           /* v6 */
+#define FMOVS   0x001           /* v6 */
+#define FNEGS   0x005           /* v6 */
+#define FITOS   0x0c4           /* v6 */
+#define FITOD   0x0c8           /* v6 */
+
+#define FSR_TEM_SHIFT   23UL
+#define FSR_TEM_MASK    (0x1fUL << FSR_TEM_SHIFT)
+#define FSR_AEXC_SHIFT  5UL
+#define FSR_AEXC_MASK   (0x1fUL << FSR_AEXC_SHIFT)
+#define FSR_CEXC_SHIFT  0UL
+#define FSR_CEXC_MASK   (0x1fUL << FSR_CEXC_SHIFT)
+
+static int do_one_mathemu(u32 insn, unsigned long *fsr, unsigned long *fregs);
+
+/* Unlike the Sparc64 version (which has a struct fpustate), we
+ * pass the taskstruct corresponding to the task which currently owns the
+ * FPU. This is partly because we don't have the fpustate struct and
+ * partly because the task owning the FPU isn't always current (as is
+ * the case for the Sparc64 port). This is probably SMP-related...
+ * This function returns 1 if all queued insns were emulated successfully.
+ * The test for unimplemented FPop in kernel mode has been moved into
+ * kernel/traps.c for simplicity.
+ */
+int do_mathemu(struct pt_regs *regs, struct task_struct *fpt)
+{
+        /* regs->pc isn't necessarily the PC at which the offending insn is sitting.
+         * The FPU maintains a queue of FPops which cause traps.
+         * When it hits an instruction that requires that the trapped op succeeded
+         * (usually because it reads a reg. that the trapped op wrote) then it
+         * causes this exception. We need to emulate all the insns on the queue
+         * and then allow the op to proceed.
+         * This code should also handle the case where the trap was precise,
+         * in which case the queue length is zero and regs->pc points at the
+         * single FPop to be emulated. (this case is untested, though :->)
+         * You'll need this case if you want to be able to emulate all FPops
+         * because the FPU either doesn't exist or has been software-disabled.
+         * [The UltraSPARC makes FP a precise trap; this isn't as stupid as it
+         * might sound because the Ultra does funky things with a superscalar
+         * architecture.]
+         */
+
+        /* You wouldn't believe how often I typed 'ftp' when I meant 'fpt' :-> */
+
+        int i;
+        int retcode = 0;                               /* assume all succeed */
+        unsigned long insn;
+
+#ifdef DEBUG_MATHEMU
+        printk("In do_mathemu()... pc is %08lx\n", regs->pc);
+        printk("fpqdepth is %ld\n", fpt->thread.fpqdepth);
+        for (i = 0; i < fpt->thread.fpqdepth; i++)
+                printk("%d: %08lx at %08lx\n", i, fpt->thread.fpqueue[i].insn,
+                       (unsigned long)fpt->thread.fpqueue[i].insn_addr);
+#endif
+
+        if (fpt->thread.fpqdepth == 0) {                   /* no queue, guilty insn is at regs->pc */
+#ifdef DEBUG_MATHEMU
+                printk("precise trap at %08lx\n", regs->pc);
+#endif
+                if (!get_user(insn, (u32 __user *) regs->pc)) {
+                        retcode = do_one_mathemu(insn, &fpt->thread.fsr, fpt->thread.float_regs);
+                        if (retcode) {
+                                /* in this case we need to fix up PC & nPC */
+                                regs->pc = regs->npc;
+                                regs->npc += 4;
+                        }
+                }
+                return retcode;
+        }
+
+        /* Normal case: need to empty the queue... */
+        for (i = 0; i < fpt->thread.fpqdepth; i++) {
+                retcode = do_one_mathemu(fpt->thread.fpqueue[i].insn, &(fpt->thread.fsr), fpt->thread.float_regs);
+                if (!retcode)                               /* insn failed, no point doing any more */
+                        break;
+        }
+        /* Now empty the queue and clear the queue_not_empty flag */
+        if (retcode)
+                fpt->thread.fsr &= ~(0x3000 | FSR_CEXC_MASK);
+        else
+                fpt->thread.fsr &= ~0x3000;
+        fpt->thread.fpqdepth = 0;
+
+        return retcode;
+}
+
+/* All routines returning an exception to raise should detect
+ * such exceptions _before_ rounding to be consistent with
+ * the behavior of the hardware in the implemented cases
+ * (and thus with the recommendations in the V9 architecture
+ * manual).
+ *
+ * We return 0 if a SIGFPE should be sent, 1 otherwise.
+ */
+static inline int record_exception(unsigned long *pfsr, int eflag)
+{
+        unsigned long fsr = *pfsr;
+        int would_trap;
+
+        /* Determine if this exception would have generated a trap. */
+        would_trap = (fsr & ((long)eflag << FSR_TEM_SHIFT)) != 0UL;
+
+        /* If trapping, we only want to signal one bit. */
+        if (would_trap != 0) {
+                eflag &= ((fsr & FSR_TEM_MASK) >> FSR_TEM_SHIFT);
+                if ((eflag & (eflag - 1)) != 0) {
+                        if (eflag & FP_EX_INVALID)
+                                eflag = FP_EX_INVALID;
+                        else if (eflag & FP_EX_OVERFLOW)
+                                eflag = FP_EX_OVERFLOW;
+                        else if (eflag & FP_EX_UNDERFLOW)
+                                eflag = FP_EX_UNDERFLOW;
+                        else if (eflag & FP_EX_DIVZERO)
+                                eflag = FP_EX_DIVZERO;
+                        else if (eflag & FP_EX_INEXACT)
+                                eflag = FP_EX_INEXACT;
+                }
+        }
+
+        /* Set CEXC, here is the rule:
+         *
+         *    In general all FPU ops will set one and only one
+         *    bit in the CEXC field, this is always the case
+         *    when the IEEE exception trap is enabled in TEM.
+         */
+        fsr &= ~(FSR_CEXC_MASK);
+        fsr |= ((long)eflag << FSR_CEXC_SHIFT);
+
+        /* Set the AEXC field, rule is:
+         *
+         *    If a trap would not be generated, the
+         *    CEXC just generated is OR'd into the
+         *    existing value of AEXC.
+         */
+        if (would_trap == 0)
+                fsr |= ((long)eflag << FSR_AEXC_SHIFT);
+
+        /* If trapping, indicate fault trap type IEEE. */
+        if (would_trap != 0)
+                fsr |= (1UL << 14);
+
+        *pfsr = fsr;
+
+        return (would_trap ? 0 : 1);
+}
+
+typedef union {
+        u32 s;
+        u64 d;
+        u64 q[2];
+} *argp;
+
+static int do_one_mathemu(u32 insn, unsigned long *pfsr, unsigned long *fregs)
+{
+        /* Emulate the given insn, updating fsr and fregs appropriately. */
+        int type = 0;
+        /* r is rd, b is rs2 and a is rs1. The *u arg tells
+           whether the argument should be packed/unpacked (0 - do not unpack/pack, 1 - unpack/pack)
+           non-u args tells the size of the argument (0 - no argument, 1 - single, 2 - double, 3 - quad */
+#define TYPE(dummy, r, ru, b, bu, a, au) type = (au << 2) | (a << 0) | (bu << 5) | (b << 3) | (ru << 8) | (r << 6)
+        int freg;
+        argp rs1 = NULL, rs2 = NULL, rd = NULL;
+        FP_DECL_EX;
+        FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
+        FP_DECL_D(DA); FP_DECL_D(DB); FP_DECL_D(DR);
+        FP_DECL_Q(QA); FP_DECL_Q(QB); FP_DECL_Q(QR);
+        int IR;
+        long fsr;
+
+#ifdef DEBUG_MATHEMU
+        printk("In do_mathemu(), emulating %08lx\n", insn);
+#endif
+
+        if ((insn & 0xc1f80000) == 0x81a00000)  /* FPOP1 */ {
+                switch ((insn >> 5) & 0x1ff) {
+                case FSQRTQ: TYPE(3,3,1,3,1,0,0); break;
+                case FADDQ:
+                case FSUBQ:
+                case FMULQ:
+                case FDIVQ: TYPE(3,3,1,3,1,3,1); break;
+                case FDMULQ: TYPE(3,3,1,2,1,2,1); break;
+                case FQTOS: TYPE(3,1,1,3,1,0,0); break;
+                case FQTOD: TYPE(3,2,1,3,1,0,0); break;
+                case FITOQ: TYPE(3,3,1,1,0,0,0); break;
+                case FSTOQ: TYPE(3,3,1,1,1,0,0); break;
+                case FDTOQ: TYPE(3,3,1,2,1,0,0); break;
+                case FQTOI: TYPE(3,1,0,3,1,0,0); break;
+                case FSQRTS: TYPE(2,1,1,1,1,0,0); break;
+                case FSQRTD: TYPE(2,2,1,2,1,0,0); break;
+                case FADDD:
+                case FSUBD:
+                case FMULD:
+                case FDIVD: TYPE(2,2,1,2,1,2,1); break;
+                case FADDS:
+                case FSUBS:
+                case FMULS:
+                case FDIVS: TYPE(2,1,1,1,1,1,1); break;
+                case FSMULD: TYPE(2,2,1,1,1,1,1); break;
+                case FDTOS: TYPE(2,1,1,2,1,0,0); break;
+                case FSTOD: TYPE(2,2,1,1,1,0,0); break;
+                case FSTOI: TYPE(2,1,0,1,1,0,0); break;
+                case FDTOI: TYPE(2,1,0,2,1,0,0); break;
+                case FITOS: TYPE(2,1,1,1,0,0,0); break;
+                case FITOD: TYPE(2,2,1,1,0,0,0); break;
+                case FMOVS:
+                case FABSS:
+                case FNEGS: TYPE(2,1,0,1,0,0,0); break;
+                default:
+#ifdef DEBUG_MATHEMU
+                        printk("unknown FPop1: %03lx\n",(insn>>5)&0x1ff);
+#endif
+                        break;
+                }
+        } else if ((insn & 0xc1f80000) == 0x81a80000)   /* FPOP2 */ {
+                switch ((insn >> 5) & 0x1ff) {
+                case FCMPS: TYPE(3,0,0,1,1,1,1); break;
+                case FCMPES: TYPE(3,0,0,1,1,1,1); break;
+                case FCMPD: TYPE(3,0,0,2,1,2,1); break;
+                case FCMPED: TYPE(3,0,0,2,1,2,1); break;
+                case FCMPQ: TYPE(3,0,0,3,1,3,1); break;
+                case FCMPEQ: TYPE(3,0,0,3,1,3,1); break;
+                default:
+#ifdef DEBUG_MATHEMU
+                        printk("unknown FPop2: %03lx\n",(insn>>5)&0x1ff);
+#endif
+                        break;
+                }
+        }
+
+        if (!type) {    /* oops, didn't recognise that FPop */
+#ifdef DEBUG_MATHEMU
+                printk("attempt to emulate unrecognised FPop!\n");
+#endif
+                return 0;
+        }
+
+        /* Decode the registers to be used */
+        freg = (*pfsr >> 14) & 0xf;
+
+        *pfsr &= ~0x1c000;                              /* clear the traptype bits */
+        
+        freg = ((insn >> 14) & 0x1f);
+        switch (type & 0x3) {                           /* is rs1 single, double or quad? */
+        case 3:
+                if (freg & 3) {                         /* quadwords must have bits 4&5 of the */
+                                                        /* encoded reg. number set to zero. */
+                        *pfsr |= (6 << 14);
+                        return 0;                       /* simulate invalid_fp_register exception */
+                }
+        /* fall through */
+        case 2:
+                if (freg & 1) {                         /* doublewords must have bit 5 zeroed */
+                        *pfsr |= (6 << 14);
+                        return 0;
+                }
+        }
+        rs1 = (argp)&fregs[freg];
+        switch (type & 0x7) {
+        case 7: FP_UNPACK_QP (QA, rs1); break;
+        case 6: FP_UNPACK_DP (DA, rs1); break;
+        case 5: FP_UNPACK_SP (SA, rs1); break;
+        }
+        freg = (insn & 0x1f);
+        switch ((type >> 3) & 0x3) {                    /* same again for rs2 */
+        case 3:
+                if (freg & 3) {                         /* quadwords must have bits 4&5 of the */
+                                                        /* encoded reg. number set to zero. */
+                        *pfsr |= (6 << 14);
+                        return 0;                       /* simulate invalid_fp_register exception */
+                }
+        /* fall through */
+        case 2:
+                if (freg & 1) {                         /* doublewords must have bit 5 zeroed */
+                        *pfsr |= (6 << 14);
+                        return 0;
+                }
+        }
+        rs2 = (argp)&fregs[freg];
+        switch ((type >> 3) & 0x7) {
+        case 7: FP_UNPACK_QP (QB, rs2); break;
+        case 6: FP_UNPACK_DP (DB, rs2); break;
+        case 5: FP_UNPACK_SP (SB, rs2); break;
+        }
+        freg = ((insn >> 25) & 0x1f);
+        switch ((type >> 6) & 0x3) {                    /* and finally rd. This one's a bit different */
+        case 0:                                         /* dest is fcc. (this must be FCMPQ or FCMPEQ) */
+                if (freg) {                             /* V8 has only one set of condition codes, so */
+                                                        /* anything but 0 in the rd field is an error */
+                        *pfsr |= (6 << 14);             /* (should probably flag as invalid opcode */
+                        return 0;                       /* but SIGFPE will do :-> ) */
+                }
+                break;
+        case 3:
+                if (freg & 3) {                         /* quadwords must have bits 4&5 of the */
+                                                        /* encoded reg. number set to zero. */
+                        *pfsr |= (6 << 14);
+                        return 0;                       /* simulate invalid_fp_register exception */
+                }
+        /* fall through */
+        case 2:
+                if (freg & 1) {                         /* doublewords must have bit 5 zeroed */
+                        *pfsr |= (6 << 14);
+                        return 0;
+                }
+        /* fall through */
+        case 1:
+                rd = (void *)&fregs[freg];
+                break;
+        }
+#ifdef DEBUG_MATHEMU
+        printk("executing insn...\n");
+#endif
+        /* do the Right Thing */
+        switch ((insn >> 5) & 0x1ff) {
+        /* + */
+        case FADDS: FP_ADD_S (SR, SA, SB); break;
+        case FADDD: FP_ADD_D (DR, DA, DB); break;
+        case FADDQ: FP_ADD_Q (QR, QA, QB); break;
+        /* - */
+        case FSUBS: FP_SUB_S (SR, SA, SB); break;
+        case FSUBD: FP_SUB_D (DR, DA, DB); break;
+        case FSUBQ: FP_SUB_Q (QR, QA, QB); break;
+        /* * */
+        case FMULS: FP_MUL_S (SR, SA, SB); break;
+        case FSMULD: FP_CONV (D, S, 2, 1, DA, SA);
+                     FP_CONV (D, S, 2, 1, DB, SB);
+        case FMULD: FP_MUL_D (DR, DA, DB); break;
+        case FDMULQ: FP_CONV (Q, D, 4, 2, QA, DA);
+                     FP_CONV (Q, D, 4, 2, QB, DB);
+        case FMULQ: FP_MUL_Q (QR, QA, QB); break;
+        /* / */
+        case FDIVS: FP_DIV_S (SR, SA, SB); break;
+        case FDIVD: FP_DIV_D (DR, DA, DB); break;
+        case FDIVQ: FP_DIV_Q (QR, QA, QB); break;
+        /* sqrt */
+        case FSQRTS: FP_SQRT_S (SR, SB); break;
+        case FSQRTD: FP_SQRT_D (DR, DB); break;
+        case FSQRTQ: FP_SQRT_Q (QR, QB); break;
+        /* mov */
+        case FMOVS: rd->s = rs2->s; break;
+        case FABSS: rd->s = rs2->s & 0x7fffffff; break;
+        case FNEGS: rd->s = rs2->s ^ 0x80000000; break;
+        /* float to int */
+        case FSTOI: FP_TO_INT_S (IR, SB, 32, 1); break;
+        case FDTOI: FP_TO_INT_D (IR, DB, 32, 1); break;
+        case FQTOI: FP_TO_INT_Q (IR, QB, 32, 1); break;
+        /* int to float */
+        case FITOS: IR = rs2->s; FP_FROM_INT_S (SR, IR, 32, int); break;
+        case FITOD: IR = rs2->s; FP_FROM_INT_D (DR, IR, 32, int); break;
+        case FITOQ: IR = rs2->s; FP_FROM_INT_Q (QR, IR, 32, int); break;
+        /* float to float */
+        case FSTOD: FP_CONV (D, S, 2, 1, DR, SB); break;
+        case FSTOQ: FP_CONV (Q, S, 4, 1, QR, SB); break;
+        case FDTOQ: FP_CONV (Q, D, 4, 2, QR, DB); break;
+        case FDTOS: FP_CONV (S, D, 1, 2, SR, DB); break;
+        case FQTOS: FP_CONV (S, Q, 1, 4, SR, QB); break;
+        case FQTOD: FP_CONV (D, Q, 2, 4, DR, QB); break;
+        /* comparison */
+        case FCMPS:
+        case FCMPES:
+                FP_CMP_S(IR, SB, SA, 3);
+                if (IR == 3 &&
+                    (((insn >> 5) & 0x1ff) == FCMPES ||
+                     FP_ISSIGNAN_S(SA) ||
+                     FP_ISSIGNAN_S(SB)))
+                        FP_SET_EXCEPTION (FP_EX_INVALID);
+                break;
+        case FCMPD:
+        case FCMPED:
+                FP_CMP_D(IR, DB, DA, 3);
+                if (IR == 3 &&
+                    (((insn >> 5) & 0x1ff) == FCMPED ||
+                     FP_ISSIGNAN_D(DA) ||
+                     FP_ISSIGNAN_D(DB)))
+                        FP_SET_EXCEPTION (FP_EX_INVALID);
+                break;
+        case FCMPQ:
+        case FCMPEQ:
+                FP_CMP_Q(IR, QB, QA, 3);
+                if (IR == 3 &&
+                    (((insn >> 5) & 0x1ff) == FCMPEQ ||
+                     FP_ISSIGNAN_Q(QA) ||
+                     FP_ISSIGNAN_Q(QB)))
+                        FP_SET_EXCEPTION (FP_EX_INVALID);
+        }
+        if (!FP_INHIBIT_RESULTS) {
+                switch ((type >> 6) & 0x7) {
+                case 0: fsr = *pfsr;
+                        if (IR == -1) IR = 2;
+                        /* fcc is always fcc0 */
+                        fsr &= ~0xc00; fsr |= (IR << 10); break;
+                        *pfsr = fsr;
+                        break;
+                case 1: rd->s = IR; break;
+                case 5: FP_PACK_SP (rd, SR); break;
+                case 6: FP_PACK_DP (rd, DR); break;
+                case 7: FP_PACK_QP (rd, QR); break;
+                }
+        }
+        if (_fex == 0)
+                return 1;                               /* success! */
+        return record_exception(pfsr, _fex);
+}