sh: Support denormalization on SH-4 FPU.
Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>hifive-unleashed-5.1
Stuart Menefy
Paul Mundt
parent
453ec9c1c3
commit
c8c0a1aba9
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@ -5,7 +5,7 @@
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obj-y := probe.o common.o
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common-y += $(addprefix ../sh3/, entry.o ex.o)
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obj-$(CONFIG_SH_FPU) += fpu.o
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obj-$(CONFIG_SH_FPU) += fpu.o softfloat.o
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obj-$(CONFIG_SH_STORE_QUEUES) += sq.o
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# CPU subtype setup
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@ -1,7 +1,4 @@
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/* $Id: fpu.c,v 1.4 2004/01/13 05:52:11 kkojima Exp $
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*
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* linux/arch/sh/kernel/fpu.c
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*
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/*
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* Save/restore floating point context for signal handlers.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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@ -9,15 +6,16 @@
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* for more details.
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*
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* Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
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* Copyright (C) 2006 ST Microelectronics Ltd. (denorm support)
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*
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* FIXME! These routines can be optimized in big endian case.
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* FIXME! These routines have not been tested for big endian case.
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*/
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/io.h>
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#include <asm/cpu/fpu.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/io.h>
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/* The PR (precision) bit in the FP Status Register must be clear when
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* an frchg instruction is executed, otherwise the instruction is undefined.
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@ -25,113 +23,122 @@
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*/
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#define FPSCR_RCHG 0x00000000
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extern unsigned long long float64_div(unsigned long long a,
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unsigned long long b);
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extern unsigned long int float32_div(unsigned long int a, unsigned long int b);
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extern unsigned long long float64_mul(unsigned long long a,
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unsigned long long b);
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extern unsigned long int float32_mul(unsigned long int a, unsigned long int b);
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extern unsigned long long float64_add(unsigned long long a,
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unsigned long long b);
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extern unsigned long int float32_add(unsigned long int a, unsigned long int b);
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extern unsigned long long float64_sub(unsigned long long a,
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unsigned long long b);
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extern unsigned long int float32_sub(unsigned long int a, unsigned long int b);
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static unsigned int fpu_exception_flags;
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/*
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* Save FPU registers onto task structure.
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* Assume called with FPU enabled (SR.FD=0).
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*/
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void
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save_fpu(struct task_struct *tsk, struct pt_regs *regs)
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void save_fpu(struct task_struct *tsk, struct pt_regs *regs)
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{
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unsigned long dummy;
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clear_tsk_thread_flag(tsk, TIF_USEDFPU);
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enable_fpu();
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asm volatile("sts.l fpul, @-%0\n\t"
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"sts.l fpscr, @-%0\n\t"
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"lds %2, fpscr\n\t"
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"frchg\n\t"
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"fmov.s fr15, @-%0\n\t"
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"fmov.s fr14, @-%0\n\t"
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"fmov.s fr13, @-%0\n\t"
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"fmov.s fr12, @-%0\n\t"
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"fmov.s fr11, @-%0\n\t"
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"fmov.s fr10, @-%0\n\t"
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"fmov.s fr9, @-%0\n\t"
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"fmov.s fr8, @-%0\n\t"
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"fmov.s fr7, @-%0\n\t"
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"fmov.s fr6, @-%0\n\t"
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"fmov.s fr5, @-%0\n\t"
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"fmov.s fr4, @-%0\n\t"
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"fmov.s fr3, @-%0\n\t"
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"fmov.s fr2, @-%0\n\t"
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"fmov.s fr1, @-%0\n\t"
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"fmov.s fr0, @-%0\n\t"
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"frchg\n\t"
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"fmov.s fr15, @-%0\n\t"
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"fmov.s fr14, @-%0\n\t"
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"fmov.s fr13, @-%0\n\t"
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"fmov.s fr12, @-%0\n\t"
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"fmov.s fr11, @-%0\n\t"
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"fmov.s fr10, @-%0\n\t"
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"fmov.s fr9, @-%0\n\t"
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"fmov.s fr8, @-%0\n\t"
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"fmov.s fr7, @-%0\n\t"
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"fmov.s fr6, @-%0\n\t"
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"fmov.s fr5, @-%0\n\t"
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"fmov.s fr4, @-%0\n\t"
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"fmov.s fr3, @-%0\n\t"
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"fmov.s fr2, @-%0\n\t"
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"fmov.s fr1, @-%0\n\t"
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"fmov.s fr0, @-%0\n\t"
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"lds %3, fpscr\n\t"
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: "=r" (dummy)
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: "0" ((char *)(&tsk->thread.fpu.hard.status)),
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"r" (FPSCR_RCHG),
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"r" (FPSCR_INIT)
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: "memory");
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asm volatile ("sts.l fpul, @-%0\n\t"
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"sts.l fpscr, @-%0\n\t"
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"lds %2, fpscr\n\t"
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"frchg\n\t"
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"fmov.s fr15, @-%0\n\t"
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"fmov.s fr14, @-%0\n\t"
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"fmov.s fr13, @-%0\n\t"
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"fmov.s fr12, @-%0\n\t"
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"fmov.s fr11, @-%0\n\t"
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"fmov.s fr10, @-%0\n\t"
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"fmov.s fr9, @-%0\n\t"
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"fmov.s fr8, @-%0\n\t"
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"fmov.s fr7, @-%0\n\t"
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"fmov.s fr6, @-%0\n\t"
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"fmov.s fr5, @-%0\n\t"
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"fmov.s fr4, @-%0\n\t"
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"fmov.s fr3, @-%0\n\t"
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"fmov.s fr2, @-%0\n\t"
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"fmov.s fr1, @-%0\n\t"
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"fmov.s fr0, @-%0\n\t"
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"frchg\n\t"
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"fmov.s fr15, @-%0\n\t"
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"fmov.s fr14, @-%0\n\t"
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"fmov.s fr13, @-%0\n\t"
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"fmov.s fr12, @-%0\n\t"
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"fmov.s fr11, @-%0\n\t"
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"fmov.s fr10, @-%0\n\t"
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"fmov.s fr9, @-%0\n\t"
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"fmov.s fr8, @-%0\n\t"
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"fmov.s fr7, @-%0\n\t"
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"fmov.s fr6, @-%0\n\t"
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"fmov.s fr5, @-%0\n\t"
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"fmov.s fr4, @-%0\n\t"
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"fmov.s fr3, @-%0\n\t"
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"fmov.s fr2, @-%0\n\t"
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"fmov.s fr1, @-%0\n\t"
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"fmov.s fr0, @-%0\n\t"
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"lds %3, fpscr\n\t":"=r" (dummy)
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:"0"((char *)(&tsk->thread.fpu.hard.status)),
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"r"(FPSCR_RCHG), "r"(FPSCR_INIT)
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:"memory");
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disable_fpu();
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release_fpu(regs);
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}
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static void
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restore_fpu(struct task_struct *tsk)
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static void restore_fpu(struct task_struct *tsk)
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{
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unsigned long dummy;
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enable_fpu();
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asm volatile("lds %2, fpscr\n\t"
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"fmov.s @%0+, fr0\n\t"
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"fmov.s @%0+, fr1\n\t"
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"fmov.s @%0+, fr2\n\t"
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"fmov.s @%0+, fr3\n\t"
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"fmov.s @%0+, fr4\n\t"
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"fmov.s @%0+, fr5\n\t"
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"fmov.s @%0+, fr6\n\t"
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"fmov.s @%0+, fr7\n\t"
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"fmov.s @%0+, fr8\n\t"
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"fmov.s @%0+, fr9\n\t"
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"fmov.s @%0+, fr10\n\t"
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"fmov.s @%0+, fr11\n\t"
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"fmov.s @%0+, fr12\n\t"
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"fmov.s @%0+, fr13\n\t"
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"fmov.s @%0+, fr14\n\t"
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"fmov.s @%0+, fr15\n\t"
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"frchg\n\t"
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"fmov.s @%0+, fr0\n\t"
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"fmov.s @%0+, fr1\n\t"
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"fmov.s @%0+, fr2\n\t"
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"fmov.s @%0+, fr3\n\t"
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"fmov.s @%0+, fr4\n\t"
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"fmov.s @%0+, fr5\n\t"
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"fmov.s @%0+, fr6\n\t"
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"fmov.s @%0+, fr7\n\t"
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"fmov.s @%0+, fr8\n\t"
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"fmov.s @%0+, fr9\n\t"
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"fmov.s @%0+, fr10\n\t"
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"fmov.s @%0+, fr11\n\t"
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"fmov.s @%0+, fr12\n\t"
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"fmov.s @%0+, fr13\n\t"
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"fmov.s @%0+, fr14\n\t"
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"fmov.s @%0+, fr15\n\t"
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"frchg\n\t"
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"lds.l @%0+, fpscr\n\t"
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"lds.l @%0+, fpul\n\t"
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: "=r" (dummy)
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: "0" (&tsk->thread.fpu), "r" (FPSCR_RCHG)
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: "memory");
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asm volatile ("lds %2, fpscr\n\t"
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"fmov.s @%0+, fr0\n\t"
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"fmov.s @%0+, fr1\n\t"
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"fmov.s @%0+, fr2\n\t"
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"fmov.s @%0+, fr3\n\t"
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"fmov.s @%0+, fr4\n\t"
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"fmov.s @%0+, fr5\n\t"
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"fmov.s @%0+, fr6\n\t"
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"fmov.s @%0+, fr7\n\t"
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"fmov.s @%0+, fr8\n\t"
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"fmov.s @%0+, fr9\n\t"
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"fmov.s @%0+, fr10\n\t"
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"fmov.s @%0+, fr11\n\t"
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"fmov.s @%0+, fr12\n\t"
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"fmov.s @%0+, fr13\n\t"
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"fmov.s @%0+, fr14\n\t"
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"fmov.s @%0+, fr15\n\t"
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"frchg\n\t"
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"fmov.s @%0+, fr0\n\t"
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"fmov.s @%0+, fr1\n\t"
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"fmov.s @%0+, fr2\n\t"
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"fmov.s @%0+, fr3\n\t"
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"fmov.s @%0+, fr4\n\t"
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"fmov.s @%0+, fr5\n\t"
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"fmov.s @%0+, fr6\n\t"
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"fmov.s @%0+, fr7\n\t"
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"fmov.s @%0+, fr8\n\t"
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"fmov.s @%0+, fr9\n\t"
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"fmov.s @%0+, fr10\n\t"
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"fmov.s @%0+, fr11\n\t"
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"fmov.s @%0+, fr12\n\t"
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"fmov.s @%0+, fr13\n\t"
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"fmov.s @%0+, fr14\n\t"
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"fmov.s @%0+, fr15\n\t"
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"frchg\n\t"
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"lds.l @%0+, fpscr\n\t"
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"lds.l @%0+, fpul\n\t"
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:"=r" (dummy)
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:"0"(&tsk->thread.fpu), "r"(FPSCR_RCHG)
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:"memory");
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disable_fpu();
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}
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@ -141,61 +148,59 @@ restore_fpu(struct task_struct *tsk)
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* double precision represents signaling NANS.
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*/
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static void
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fpu_init(void)
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static void fpu_init(void)
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{
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enable_fpu();
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asm volatile("lds %0, fpul\n\t"
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"lds %1, fpscr\n\t"
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"fsts fpul, fr0\n\t"
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"fsts fpul, fr1\n\t"
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"fsts fpul, fr2\n\t"
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"fsts fpul, fr3\n\t"
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"fsts fpul, fr4\n\t"
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"fsts fpul, fr5\n\t"
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"fsts fpul, fr6\n\t"
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"fsts fpul, fr7\n\t"
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"fsts fpul, fr8\n\t"
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"fsts fpul, fr9\n\t"
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"fsts fpul, fr10\n\t"
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"fsts fpul, fr11\n\t"
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"fsts fpul, fr12\n\t"
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"fsts fpul, fr13\n\t"
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"fsts fpul, fr14\n\t"
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"fsts fpul, fr15\n\t"
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"frchg\n\t"
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"fsts fpul, fr0\n\t"
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"fsts fpul, fr1\n\t"
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"fsts fpul, fr2\n\t"
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"fsts fpul, fr3\n\t"
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"fsts fpul, fr4\n\t"
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"fsts fpul, fr5\n\t"
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"fsts fpul, fr6\n\t"
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"fsts fpul, fr7\n\t"
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"fsts fpul, fr8\n\t"
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"fsts fpul, fr9\n\t"
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"fsts fpul, fr10\n\t"
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"fsts fpul, fr11\n\t"
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"fsts fpul, fr12\n\t"
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"fsts fpul, fr13\n\t"
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"fsts fpul, fr14\n\t"
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"fsts fpul, fr15\n\t"
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"frchg\n\t"
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"lds %2, fpscr\n\t"
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: /* no output */
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: "r" (0), "r" (FPSCR_RCHG), "r" (FPSCR_INIT));
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asm volatile ( "lds %0, fpul\n\t"
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"lds %1, fpscr\n\t"
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"fsts fpul, fr0\n\t"
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"fsts fpul, fr1\n\t"
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"fsts fpul, fr2\n\t"
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"fsts fpul, fr3\n\t"
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"fsts fpul, fr4\n\t"
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"fsts fpul, fr5\n\t"
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"fsts fpul, fr6\n\t"
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"fsts fpul, fr7\n\t"
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"fsts fpul, fr8\n\t"
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"fsts fpul, fr9\n\t"
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"fsts fpul, fr10\n\t"
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"fsts fpul, fr11\n\t"
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"fsts fpul, fr12\n\t"
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"fsts fpul, fr13\n\t"
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"fsts fpul, fr14\n\t"
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"fsts fpul, fr15\n\t"
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"frchg\n\t"
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"fsts fpul, fr0\n\t"
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"fsts fpul, fr1\n\t"
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"fsts fpul, fr2\n\t"
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"fsts fpul, fr3\n\t"
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"fsts fpul, fr4\n\t"
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"fsts fpul, fr5\n\t"
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"fsts fpul, fr6\n\t"
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"fsts fpul, fr7\n\t"
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"fsts fpul, fr8\n\t"
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"fsts fpul, fr9\n\t"
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"fsts fpul, fr10\n\t"
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"fsts fpul, fr11\n\t"
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"fsts fpul, fr12\n\t"
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"fsts fpul, fr13\n\t"
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"fsts fpul, fr14\n\t"
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"fsts fpul, fr15\n\t"
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"frchg\n\t"
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"lds %2, fpscr\n\t"
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: /* no output */
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:"r" (0), "r"(FPSCR_RCHG), "r"(FPSCR_INIT));
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disable_fpu();
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}
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/**
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* denormal_to_double - Given denormalized float number,
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* store double float
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* denormal_to_double - Given denormalized float number,
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* store double float
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*
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* @fpu: Pointer to sh_fpu_hard structure
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* @n: Index to FP register
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* @fpu: Pointer to sh_fpu_hard structure
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* @n: Index to FP register
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*/
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static void
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denormal_to_double (struct sh_fpu_hard_struct *fpu, int n)
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static void denormal_to_double(struct sh_fpu_hard_struct *fpu, int n)
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{
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unsigned long du, dl;
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unsigned long x = fpu->fpul;
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@ -212,7 +217,7 @@ denormal_to_double (struct sh_fpu_hard_struct *fpu, int n)
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dl = x << 29;
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fpu->fp_regs[n] = du;
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fpu->fp_regs[n+1] = dl;
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fpu->fp_regs[n + 1] = dl;
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}
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}
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@ -223,67 +228,191 @@ denormal_to_double (struct sh_fpu_hard_struct *fpu, int n)
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*
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* Returns 1 when it's handled (should not cause exception).
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*/
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static int
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ieee_fpe_handler (struct pt_regs *regs)
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static int ieee_fpe_handler(struct pt_regs *regs)
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{
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unsigned short insn = *(unsigned short *) regs->pc;
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unsigned short insn = *(unsigned short *)regs->pc;
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unsigned short finsn;
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unsigned long nextpc;
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int nib[4] = {
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||||
(insn >> 12) & 0xf,
|
||||
(insn >> 8) & 0xf,
|
||||
(insn >> 4) & 0xf,
|
||||
insn & 0xf};
|
||||
insn & 0xf
|
||||
};
|
||||
|
||||
if (nib[0] == 0xb ||
|
||||
(nib[0] == 0x4 && nib[2] == 0x0 && nib[3] == 0xb)) /* bsr & jsr */
|
||||
regs->pr = regs->pc + 4;
|
||||
if (nib[0] == 0xa || nib[0] == 0xb) { /* bra & bsr */
|
||||
nextpc = regs->pc + 4 + ((short) ((insn & 0xfff) << 4) >> 3);
|
||||
finsn = *(unsigned short *) (regs->pc + 2);
|
||||
} else if (nib[0] == 0x8 && nib[1] == 0xd) { /* bt/s */
|
||||
if (nib[0] == 0xb || (nib[0] == 0x4 && nib[2] == 0x0 && nib[3] == 0xb))
|
||||
regs->pr = regs->pc + 4; /* bsr & jsr */
|
||||
|
||||
if (nib[0] == 0xa || nib[0] == 0xb) {
|
||||
/* bra & bsr */
|
||||
nextpc = regs->pc + 4 + ((short)((insn & 0xfff) << 4) >> 3);
|
||||
finsn = *(unsigned short *)(regs->pc + 2);
|
||||
} else if (nib[0] == 0x8 && nib[1] == 0xd) {
|
||||
/* bt/s */
|
||||
if (regs->sr & 1)
|
||||
nextpc = regs->pc + 4 + ((char) (insn & 0xff) << 1);
|
||||
nextpc = regs->pc + 4 + ((char)(insn & 0xff) << 1);
|
||||
else
|
||||
nextpc = regs->pc + 4;
|
||||
finsn = *(unsigned short *) (regs->pc + 2);
|
||||
} else if (nib[0] == 0x8 && nib[1] == 0xf) { /* bf/s */
|
||||
finsn = *(unsigned short *)(regs->pc + 2);
|
||||
} else if (nib[0] == 0x8 && nib[1] == 0xf) {
|
||||
/* bf/s */
|
||||
if (regs->sr & 1)
|
||||
nextpc = regs->pc + 4;
|
||||
else
|
||||
nextpc = regs->pc + 4 + ((char) (insn & 0xff) << 1);
|
||||
finsn = *(unsigned short *) (regs->pc + 2);
|
||||
nextpc = regs->pc + 4 + ((char)(insn & 0xff) << 1);
|
||||
finsn = *(unsigned short *)(regs->pc + 2);
|
||||
} else if (nib[0] == 0x4 && nib[3] == 0xb &&
|
||||
(nib[2] == 0x0 || nib[2] == 0x2)) { /* jmp & jsr */
|
||||
(nib[2] == 0x0 || nib[2] == 0x2)) {
|
||||
/* jmp & jsr */
|
||||
nextpc = regs->regs[nib[1]];
|
||||
finsn = *(unsigned short *) (regs->pc + 2);
|
||||
finsn = *(unsigned short *)(regs->pc + 2);
|
||||
} else if (nib[0] == 0x0 && nib[3] == 0x3 &&
|
||||
(nib[2] == 0x0 || nib[2] == 0x2)) { /* braf & bsrf */
|
||||
(nib[2] == 0x0 || nib[2] == 0x2)) {
|
||||
/* braf & bsrf */
|
||||
nextpc = regs->pc + 4 + regs->regs[nib[1]];
|
||||
finsn = *(unsigned short *) (regs->pc + 2);
|
||||
} else if (insn == 0x000b) { /* rts */
|
||||
finsn = *(unsigned short *)(regs->pc + 2);
|
||||
} else if (insn == 0x000b) {
|
||||
/* rts */
|
||||
nextpc = regs->pr;
|
||||
finsn = *(unsigned short *) (regs->pc + 2);
|
||||
finsn = *(unsigned short *)(regs->pc + 2);
|
||||
} else {
|
||||
nextpc = regs->pc + instruction_size(insn);
|
||||
finsn = insn;
|
||||
}
|
||||
|
||||
if ((finsn & 0xf1ff) == 0xf0ad) { /* fcnvsd */
|
||||
if ((finsn & 0xf1ff) == 0xf0ad) {
|
||||
/* fcnvsd */
|
||||
struct task_struct *tsk = current;
|
||||
|
||||
save_fpu(tsk, regs);
|
||||
if ((tsk->thread.fpu.hard.fpscr & (1 << 17))) {
|
||||
if ((tsk->thread.fpu.hard.fpscr & FPSCR_CAUSE_ERROR))
|
||||
/* FPU error */
|
||||
denormal_to_double (&tsk->thread.fpu.hard,
|
||||
(finsn >> 8) & 0xf);
|
||||
tsk->thread.fpu.hard.fpscr &=
|
||||
~(FPSCR_CAUSE_MASK | FPSCR_FLAG_MASK);
|
||||
grab_fpu(regs);
|
||||
restore_fpu(tsk);
|
||||
set_tsk_thread_flag(tsk, TIF_USEDFPU);
|
||||
denormal_to_double(&tsk->thread.fpu.hard,
|
||||
(finsn >> 8) & 0xf);
|
||||
else
|
||||
return 0;
|
||||
|
||||
regs->pc = nextpc;
|
||||
return 1;
|
||||
} else if ((finsn & 0xf00f) == 0xf002) {
|
||||
/* fmul */
|
||||
struct task_struct *tsk = current;
|
||||
int fpscr;
|
||||
int n, m, prec;
|
||||
unsigned int hx, hy;
|
||||
|
||||
n = (finsn >> 8) & 0xf;
|
||||
m = (finsn >> 4) & 0xf;
|
||||
hx = tsk->thread.fpu.hard.fp_regs[n];
|
||||
hy = tsk->thread.fpu.hard.fp_regs[m];
|
||||
fpscr = tsk->thread.fpu.hard.fpscr;
|
||||
prec = fpscr & FPSCR_DBL_PRECISION;
|
||||
|
||||
if ((fpscr & FPSCR_CAUSE_ERROR)
|
||||
&& (prec && ((hx & 0x7fffffff) < 0x00100000
|
||||
|| (hy & 0x7fffffff) < 0x00100000))) {
|
||||
long long llx, lly;
|
||||
|
||||
/* FPU error because of denormal (doubles) */
|
||||
llx = ((long long)hx << 32)
|
||||
| tsk->thread.fpu.hard.fp_regs[n + 1];
|
||||
lly = ((long long)hy << 32)
|
||||
| tsk->thread.fpu.hard.fp_regs[m + 1];
|
||||
llx = float64_mul(llx, lly);
|
||||
tsk->thread.fpu.hard.fp_regs[n] = llx >> 32;
|
||||
tsk->thread.fpu.hard.fp_regs[n + 1] = llx & 0xffffffff;
|
||||
} else if ((fpscr & FPSCR_CAUSE_ERROR)
|
||||
&& (!prec && ((hx & 0x7fffffff) < 0x00800000
|
||||
|| (hy & 0x7fffffff) < 0x00800000))) {
|
||||
/* FPU error because of denormal (floats) */
|
||||
hx = float32_mul(hx, hy);
|
||||
tsk->thread.fpu.hard.fp_regs[n] = hx;
|
||||
} else
|
||||
force_sig(SIGFPE, tsk);
|
||||
return 0;
|
||||
|
||||
regs->pc = nextpc;
|
||||
return 1;
|
||||
} else if ((finsn & 0xf00e) == 0xf000) {
|
||||
/* fadd, fsub */
|
||||
struct task_struct *tsk = current;
|
||||
int fpscr;
|
||||
int n, m, prec;
|
||||
unsigned int hx, hy;
|
||||
|
||||
n = (finsn >> 8) & 0xf;
|
||||
m = (finsn >> 4) & 0xf;
|
||||
hx = tsk->thread.fpu.hard.fp_regs[n];
|
||||
hy = tsk->thread.fpu.hard.fp_regs[m];
|
||||
fpscr = tsk->thread.fpu.hard.fpscr;
|
||||
prec = fpscr & FPSCR_DBL_PRECISION;
|
||||
|
||||
if ((fpscr & FPSCR_CAUSE_ERROR)
|
||||
&& (prec && ((hx & 0x7fffffff) < 0x00100000
|
||||
|| (hy & 0x7fffffff) < 0x00100000))) {
|
||||
long long llx, lly;
|
||||
|
||||
/* FPU error because of denormal (doubles) */
|
||||
llx = ((long long)hx << 32)
|
||||
| tsk->thread.fpu.hard.fp_regs[n + 1];
|
||||
lly = ((long long)hy << 32)
|
||||
| tsk->thread.fpu.hard.fp_regs[m + 1];
|
||||
if ((finsn & 0xf00f) == 0xf000)
|
||||
llx = float64_add(llx, lly);
|
||||
else
|
||||
llx = float64_sub(llx, lly);
|
||||
tsk->thread.fpu.hard.fp_regs[n] = llx >> 32;
|
||||
tsk->thread.fpu.hard.fp_regs[n + 1] = llx & 0xffffffff;
|
||||
} else if ((fpscr & FPSCR_CAUSE_ERROR)
|
||||
&& (!prec && ((hx & 0x7fffffff) < 0x00800000
|
||||
|| (hy & 0x7fffffff) < 0x00800000))) {
|
||||
/* FPU error because of denormal (floats) */
|
||||
if ((finsn & 0xf00f) == 0xf000)
|
||||
hx = float32_add(hx, hy);
|
||||
else
|
||||
hx = float32_sub(hx, hy);
|
||||
tsk->thread.fpu.hard.fp_regs[n] = hx;
|
||||
} else
|
||||
return 0;
|
||||
|
||||
regs->pc = nextpc;
|
||||
return 1;
|
||||
} else if ((finsn & 0xf003) == 0xf003) {
|
||||
/* fdiv */
|
||||
struct task_struct *tsk = current;
|
||||
int fpscr;
|
||||
int n, m, prec;
|
||||
unsigned int hx, hy;
|
||||
|
||||
n = (finsn >> 8) & 0xf;
|
||||
m = (finsn >> 4) & 0xf;
|
||||
hx = tsk->thread.fpu.hard.fp_regs[n];
|
||||
hy = tsk->thread.fpu.hard.fp_regs[m];
|
||||
fpscr = tsk->thread.fpu.hard.fpscr;
|
||||
prec = fpscr & FPSCR_DBL_PRECISION;
|
||||
|
||||
if ((fpscr & FPSCR_CAUSE_ERROR)
|
||||
&& (prec && ((hx & 0x7fffffff) < 0x00100000
|
||||
|| (hy & 0x7fffffff) < 0x00100000))) {
|
||||
long long llx, lly;
|
||||
|
||||
/* FPU error because of denormal (doubles) */
|
||||
llx = ((long long)hx << 32)
|
||||
| tsk->thread.fpu.hard.fp_regs[n + 1];
|
||||
lly = ((long long)hy << 32)
|
||||
| tsk->thread.fpu.hard.fp_regs[m + 1];
|
||||
|
||||
llx = float64_div(llx, lly);
|
||||
|
||||
tsk->thread.fpu.hard.fp_regs[n] = llx >> 32;
|
||||
tsk->thread.fpu.hard.fp_regs[n + 1] = llx & 0xffffffff;
|
||||
} else if ((fpscr & FPSCR_CAUSE_ERROR)
|
||||
&& (!prec && ((hx & 0x7fffffff) < 0x00800000
|
||||
|| (hy & 0x7fffffff) < 0x00800000))) {
|
||||
/* FPU error because of denormal (floats) */
|
||||
hx = float32_div(hx, hy);
|
||||
tsk->thread.fpu.hard.fp_regs[n] = hx;
|
||||
} else
|
||||
return 0;
|
||||
|
||||
regs->pc = nextpc;
|
||||
return 1;
|
||||
|
|
@ -292,16 +421,41 @@ ieee_fpe_handler (struct pt_regs *regs)
|
|||
return 0;
|
||||
}
|
||||
|
||||
void float_raise(unsigned int flags)
|
||||
{
|
||||
fpu_exception_flags |= flags;
|
||||
}
|
||||
|
||||
int float_rounding_mode(void)
|
||||
{
|
||||
struct task_struct *tsk = current;
|
||||
int roundingMode = FPSCR_ROUNDING_MODE(tsk->thread.fpu.hard.fpscr);
|
||||
return roundingMode;
|
||||
}
|
||||
|
||||
BUILD_TRAP_HANDLER(fpu_error)
|
||||
{
|
||||
struct task_struct *tsk = current;
|
||||
TRAP_HANDLER_DECL;
|
||||
|
||||
if (ieee_fpe_handler(regs))
|
||||
return;
|
||||
|
||||
regs->pc += 2;
|
||||
save_fpu(tsk, regs);
|
||||
fpu_exception_flags = 0;
|
||||
if (ieee_fpe_handler(regs)) {
|
||||
tsk->thread.fpu.hard.fpscr &=
|
||||
~(FPSCR_CAUSE_MASK | FPSCR_FLAG_MASK);
|
||||
tsk->thread.fpu.hard.fpscr |= fpu_exception_flags;
|
||||
/* Set the FPSCR flag as well as cause bits - simply
|
||||
* replicate the cause */
|
||||
tsk->thread.fpu.hard.fpscr |= (fpu_exception_flags >> 10);
|
||||
grab_fpu(regs);
|
||||
restore_fpu(tsk);
|
||||
set_tsk_thread_flag(tsk, TIF_USEDFPU);
|
||||
if ((((tsk->thread.fpu.hard.fpscr & FPSCR_ENABLE_MASK) >> 7) &
|
||||
(fpu_exception_flags >> 2)) == 0) {
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
force_sig(SIGFPE, tsk);
|
||||
}
|
||||
|
||||
|
|
@ -319,7 +473,7 @@ BUILD_TRAP_HANDLER(fpu_state_restore)
|
|||
if (used_math()) {
|
||||
/* Using the FPU again. */
|
||||
restore_fpu(tsk);
|
||||
} else {
|
||||
} else {
|
||||
/* First time FPU user. */
|
||||
fpu_init();
|
||||
set_used_math();
|
||||
|
|
|
|||
|
|
@ -0,0 +1,892 @@
|
|||
/*
|
||||
* Floating point emulation support for subnormalised numbers on SH4
|
||||
* architecture This file is derived from the SoftFloat IEC/IEEE
|
||||
* Floating-point Arithmetic Package, Release 2 the original license of
|
||||
* which is reproduced below.
|
||||
*
|
||||
* ========================================================================
|
||||
*
|
||||
* This C source file is part of the SoftFloat IEC/IEEE Floating-point
|
||||
* Arithmetic Package, Release 2.
|
||||
*
|
||||
* Written by John R. Hauser. This work was made possible in part by the
|
||||
* International Computer Science Institute, located at Suite 600, 1947 Center
|
||||
* Street, Berkeley, California 94704. Funding was partially provided by the
|
||||
* National Science Foundation under grant MIP-9311980. The original version
|
||||
* of this code was written as part of a project to build a fixed-point vector
|
||||
* processor in collaboration with the University of California at Berkeley,
|
||||
* overseen by Profs. Nelson Morgan and John Wawrzynek. More information
|
||||
* is available through the web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
|
||||
* arithmetic/softfloat.html'.
|
||||
*
|
||||
* THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
|
||||
* has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
|
||||
* TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
|
||||
* PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
|
||||
* AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
|
||||
*
|
||||
* Derivative works are acceptable, even for commercial purposes, so long as
|
||||
* (1) they include prominent notice that the work is derivative, and (2) they
|
||||
* include prominent notice akin to these three paragraphs for those parts of
|
||||
* this code that are retained.
|
||||
*
|
||||
* ========================================================================
|
||||
*
|
||||
* SH4 modifications by Ismail Dhaoui <ismail.dhaoui@st.com>
|
||||
* and Kamel Khelifi <kamel.khelifi@st.com>
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
#include <asm/cpu/fpu.h>
|
||||
|
||||
#define LIT64( a ) a##LL
|
||||
|
||||
typedef char flag;
|
||||
typedef unsigned char uint8;
|
||||
typedef signed char int8;
|
||||
typedef int uint16;
|
||||
typedef int int16;
|
||||
typedef unsigned int uint32;
|
||||
typedef signed int int32;
|
||||
|
||||
typedef unsigned long long int bits64;
|
||||
typedef signed long long int sbits64;
|
||||
|
||||
typedef unsigned char bits8;
|
||||
typedef signed char sbits8;
|
||||
typedef unsigned short int bits16;
|
||||
typedef signed short int sbits16;
|
||||
typedef unsigned int bits32;
|
||||
typedef signed int sbits32;
|
||||
|
||||
typedef unsigned long long int uint64;
|
||||
typedef signed long long int int64;
|
||||
|
||||
typedef unsigned long int float32;
|
||||
typedef unsigned long long float64;
|
||||
|
||||
extern void float_raise(unsigned int flags); /* in fpu.c */
|
||||
extern int float_rounding_mode(void); /* in fpu.c */
|
||||
|
||||
inline bits64 extractFloat64Frac(float64 a);
|
||||
inline flag extractFloat64Sign(float64 a);
|
||||
inline int16 extractFloat64Exp(float64 a);
|
||||
inline int16 extractFloat32Exp(float32 a);
|
||||
inline flag extractFloat32Sign(float32 a);
|
||||
inline bits32 extractFloat32Frac(float32 a);
|
||||
inline float64 packFloat64(flag zSign, int16 zExp, bits64 zSig);
|
||||
inline void shift64RightJamming(bits64 a, int16 count, bits64 * zPtr);
|
||||
inline float32 packFloat32(flag zSign, int16 zExp, bits32 zSig);
|
||||
inline void shift32RightJamming(bits32 a, int16 count, bits32 * zPtr);
|
||||
float64 float64_sub(float64 a, float64 b);
|
||||
float32 float32_sub(float32 a, float32 b);
|
||||
float32 float32_add(float32 a, float32 b);
|
||||
float64 float64_add(float64 a, float64 b);
|
||||
float64 float64_div(float64 a, float64 b);
|
||||
float32 float32_div(float32 a, float32 b);
|
||||
float32 float32_mul(float32 a, float32 b);
|
||||
float64 float64_mul(float64 a, float64 b);
|
||||
inline void add128(bits64 a0, bits64 a1, bits64 b0, bits64 b1, bits64 * z0Ptr,
|
||||
bits64 * z1Ptr);
|
||||
inline void sub128(bits64 a0, bits64 a1, bits64 b0, bits64 b1, bits64 * z0Ptr,
|
||||
bits64 * z1Ptr);
|
||||
inline void mul64To128(bits64 a, bits64 b, bits64 * z0Ptr, bits64 * z1Ptr);
|
||||
|
||||
static int8 countLeadingZeros32(bits32 a);
|
||||
static int8 countLeadingZeros64(bits64 a);
|
||||
static float64 normalizeRoundAndPackFloat64(flag zSign, int16 zExp,
|
||||
bits64 zSig);
|
||||
static float64 subFloat64Sigs(float64 a, float64 b, flag zSign);
|
||||
static float64 addFloat64Sigs(float64 a, float64 b, flag zSign);
|
||||
static float32 roundAndPackFloat32(flag zSign, int16 zExp, bits32 zSig);
|
||||
static float32 normalizeRoundAndPackFloat32(flag zSign, int16 zExp,
|
||||
bits32 zSig);
|
||||
static float64 roundAndPackFloat64(flag zSign, int16 zExp, bits64 zSig);
|
||||
static float32 subFloat32Sigs(float32 a, float32 b, flag zSign);
|
||||
static float32 addFloat32Sigs(float32 a, float32 b, flag zSign);
|
||||
static void normalizeFloat64Subnormal(bits64 aSig, int16 * zExpPtr,
|
||||
bits64 * zSigPtr);
|
||||
static bits64 estimateDiv128To64(bits64 a0, bits64 a1, bits64 b);
|
||||
static void normalizeFloat32Subnormal(bits32 aSig, int16 * zExpPtr,
|
||||
bits32 * zSigPtr);
|
||||
|
||||
inline bits64 extractFloat64Frac(float64 a)
|
||||
{
|
||||
return a & LIT64(0x000FFFFFFFFFFFFF);
|
||||
}
|
||||
|
||||
inline flag extractFloat64Sign(float64 a)
|
||||
{
|
||||
return a >> 63;
|
||||
}
|
||||
|
||||
inline int16 extractFloat64Exp(float64 a)
|
||||
{
|
||||
return (a >> 52) & 0x7FF;
|
||||
}
|
||||
|
||||
inline int16 extractFloat32Exp(float32 a)
|
||||
{
|
||||
return (a >> 23) & 0xFF;
|
||||
}
|
||||
|
||||
inline flag extractFloat32Sign(float32 a)
|
||||
{
|
||||
return a >> 31;
|
||||
}
|
||||
|
||||
inline bits32 extractFloat32Frac(float32 a)
|
||||
{
|
||||
return a & 0x007FFFFF;
|
||||
}
|
||||
|
||||
inline float64 packFloat64(flag zSign, int16 zExp, bits64 zSig)
|
||||
{
|
||||
return (((bits64) zSign) << 63) + (((bits64) zExp) << 52) + zSig;
|
||||
}
|
||||
|
||||
inline void shift64RightJamming(bits64 a, int16 count, bits64 * zPtr)
|
||||
{
|
||||
bits64 z;
|
||||
|
||||
if (count == 0) {
|
||||
z = a;
|
||||
} else if (count < 64) {
|
||||
z = (a >> count) | ((a << ((-count) & 63)) != 0);
|
||||
} else {
|
||||
z = (a != 0);
|
||||
}
|
||||
*zPtr = z;
|
||||
}
|
||||
|
||||
static int8 countLeadingZeros32(bits32 a)
|
||||
{
|
||||
static const int8 countLeadingZerosHigh[] = {
|
||||
8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
|
||||
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
|
||||
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
|
||||
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
||||
};
|
||||
int8 shiftCount;
|
||||
|
||||
shiftCount = 0;
|
||||
if (a < 0x10000) {
|
||||
shiftCount += 16;
|
||||
a <<= 16;
|
||||
}
|
||||
if (a < 0x1000000) {
|
||||
shiftCount += 8;
|
||||
a <<= 8;
|
||||
}
|
||||
shiftCount += countLeadingZerosHigh[a >> 24];
|
||||
return shiftCount;
|
||||
|
||||
}
|
||||
|
||||
static int8 countLeadingZeros64(bits64 a)
|
||||
{
|
||||
int8 shiftCount;
|
||||
|
||||
shiftCount = 0;
|
||||
if (a < ((bits64) 1) << 32) {
|
||||
shiftCount += 32;
|
||||
} else {
|
||||
a >>= 32;
|
||||
}
|
||||
shiftCount += countLeadingZeros32(a);
|
||||
return shiftCount;
|
||||
|
||||
}
|
||||
|
||||
static float64 normalizeRoundAndPackFloat64(flag zSign, int16 zExp, bits64 zSig)
|
||||
{
|
||||
int8 shiftCount;
|
||||
|
||||
shiftCount = countLeadingZeros64(zSig) - 1;
|
||||
return roundAndPackFloat64(zSign, zExp - shiftCount,
|
||||
zSig << shiftCount);
|
||||
|
||||
}
|
||||
|
||||
static float64 subFloat64Sigs(float64 a, float64 b, flag zSign)
|
||||
{
|
||||
int16 aExp, bExp, zExp;
|
||||
bits64 aSig, bSig, zSig;
|
||||
int16 expDiff;
|
||||
|
||||
aSig = extractFloat64Frac(a);
|
||||
aExp = extractFloat64Exp(a);
|
||||
bSig = extractFloat64Frac(b);
|
||||
bExp = extractFloat64Exp(b);
|
||||
expDiff = aExp - bExp;
|
||||
aSig <<= 10;
|
||||
bSig <<= 10;
|
||||
if (0 < expDiff)
|
||||
goto aExpBigger;
|
||||
if (expDiff < 0)
|
||||
goto bExpBigger;
|
||||
if (aExp == 0) {
|
||||
aExp = 1;
|
||||
bExp = 1;
|
||||
}
|
||||
if (bSig < aSig)
|
||||
goto aBigger;
|
||||
if (aSig < bSig)
|
||||
goto bBigger;
|
||||
return packFloat64(float_rounding_mode() == FPSCR_RM_ZERO, 0, 0);
|
||||
bExpBigger:
|
||||
if (bExp == 0x7FF) {
|
||||
return packFloat64(zSign ^ 1, 0x7FF, 0);
|
||||
}
|
||||
if (aExp == 0) {
|
||||
++expDiff;
|
||||
} else {
|
||||
aSig |= LIT64(0x4000000000000000);
|
||||
}
|
||||
shift64RightJamming(aSig, -expDiff, &aSig);
|
||||
bSig |= LIT64(0x4000000000000000);
|
||||
bBigger:
|
||||
zSig = bSig - aSig;
|
||||
zExp = bExp;
|
||||
zSign ^= 1;
|
||||
goto normalizeRoundAndPack;
|
||||
aExpBigger:
|
||||
if (aExp == 0x7FF) {
|
||||
return a;
|
||||
}
|
||||
if (bExp == 0) {
|
||||
--expDiff;
|
||||
} else {
|
||||
bSig |= LIT64(0x4000000000000000);
|
||||
}
|
||||
shift64RightJamming(bSig, expDiff, &bSig);
|
||||
aSig |= LIT64(0x4000000000000000);
|
||||
aBigger:
|
||||
zSig = aSig - bSig;
|
||||
zExp = aExp;
|
||||
normalizeRoundAndPack:
|
||||
--zExp;
|
||||
return normalizeRoundAndPackFloat64(zSign, zExp, zSig);
|
||||
|
||||
}
|
||||
static float64 addFloat64Sigs(float64 a, float64 b, flag zSign)
|
||||
{
|
||||
int16 aExp, bExp, zExp;
|
||||
bits64 aSig, bSig, zSig;
|
||||
int16 expDiff;
|
||||
|
||||
aSig = extractFloat64Frac(a);
|
||||
aExp = extractFloat64Exp(a);
|
||||
bSig = extractFloat64Frac(b);
|
||||
bExp = extractFloat64Exp(b);
|
||||
expDiff = aExp - bExp;
|
||||
aSig <<= 9;
|
||||
bSig <<= 9;
|
||||
if (0 < expDiff) {
|
||||
if (aExp == 0x7FF) {
|
||||
return a;
|
||||
}
|
||||
if (bExp == 0) {
|
||||
--expDiff;
|
||||
} else {
|
||||
bSig |= LIT64(0x2000000000000000);
|
||||
}
|
||||
shift64RightJamming(bSig, expDiff, &bSig);
|
||||
zExp = aExp;
|
||||
} else if (expDiff < 0) {
|
||||
if (bExp == 0x7FF) {
|
||||
return packFloat64(zSign, 0x7FF, 0);
|
||||
}
|
||||
if (aExp == 0) {
|
||||
++expDiff;
|
||||
} else {
|
||||
aSig |= LIT64(0x2000000000000000);
|
||||
}
|
||||
shift64RightJamming(aSig, -expDiff, &aSig);
|
||||
zExp = bExp;
|
||||
} else {
|
||||
if (aExp == 0x7FF) {
|
||||
return a;
|
||||
}
|
||||
if (aExp == 0)
|
||||
return packFloat64(zSign, 0, (aSig + bSig) >> 9);
|
||||
zSig = LIT64(0x4000000000000000) + aSig + bSig;
|
||||
zExp = aExp;
|
||||
goto roundAndPack;
|
||||
}
|
||||
aSig |= LIT64(0x2000000000000000);
|
||||
zSig = (aSig + bSig) << 1;
|
||||
--zExp;
|
||||
if ((sbits64) zSig < 0) {
|
||||
zSig = aSig + bSig;
|
||||
++zExp;
|
||||
}
|
||||
roundAndPack:
|
||||
return roundAndPackFloat64(zSign, zExp, zSig);
|
||||
|
||||
}
|
||||
|
||||
inline float32 packFloat32(flag zSign, int16 zExp, bits32 zSig)
|
||||
{
|
||||
return (((bits32) zSign) << 31) + (((bits32) zExp) << 23) + zSig;
|
||||
}
|
||||
|
||||
inline void shift32RightJamming(bits32 a, int16 count, bits32 * zPtr)
|
||||
{
|
||||
bits32 z;
|
||||
if (count == 0) {
|
||||
z = a;
|
||||
} else if (count < 32) {
|
||||
z = (a >> count) | ((a << ((-count) & 31)) != 0);
|
||||
} else {
|
||||
z = (a != 0);
|
||||
}
|
||||
*zPtr = z;
|
||||
}
|
||||
|
||||
static float32 roundAndPackFloat32(flag zSign, int16 zExp, bits32 zSig)
|
||||
{
|
||||
flag roundNearestEven;
|
||||
int8 roundIncrement, roundBits;
|
||||
flag isTiny;
|
||||
|
||||
/* SH4 has only 2 rounding modes - round to nearest and round to zero */
|
||||
roundNearestEven = (float_rounding_mode() == FPSCR_RM_NEAREST);
|
||||
roundIncrement = 0x40;
|
||||
if (!roundNearestEven) {
|
||||
roundIncrement = 0;
|
||||
}
|
||||
roundBits = zSig & 0x7F;
|
||||
if (0xFD <= (bits16) zExp) {
|
||||
if ((0xFD < zExp)
|
||||
|| ((zExp == 0xFD)
|
||||
&& ((sbits32) (zSig + roundIncrement) < 0))
|
||||
) {
|
||||
float_raise(FPSCR_CAUSE_OVERFLOW | FPSCR_CAUSE_INEXACT);
|
||||
return packFloat32(zSign, 0xFF,
|
||||
0) - (roundIncrement == 0);
|
||||
}
|
||||
if (zExp < 0) {
|
||||
isTiny = (zExp < -1)
|
||||
|| (zSig + roundIncrement < 0x80000000);
|
||||
shift32RightJamming(zSig, -zExp, &zSig);
|
||||
zExp = 0;
|
||||
roundBits = zSig & 0x7F;
|
||||
if (isTiny && roundBits)
|
||||
float_raise(FPSCR_CAUSE_UNDERFLOW);
|
||||
}
|
||||
}
|
||||
if (roundBits)
|
||||
float_raise(FPSCR_CAUSE_INEXACT);
|
||||
zSig = (zSig + roundIncrement) >> 7;
|
||||
zSig &= ~(((roundBits ^ 0x40) == 0) & roundNearestEven);
|
||||
if (zSig == 0)
|
||||
zExp = 0;
|
||||
return packFloat32(zSign, zExp, zSig);
|
||||
|
||||
}
|
||||
|
||||
static float32 normalizeRoundAndPackFloat32(flag zSign, int16 zExp, bits32 zSig)
|
||||
{
|
||||
int8 shiftCount;
|
||||
|
||||
shiftCount = countLeadingZeros32(zSig) - 1;
|
||||
return roundAndPackFloat32(zSign, zExp - shiftCount,
|
||||
zSig << shiftCount);
|
||||
}
|
||||
|
||||
static float64 roundAndPackFloat64(flag zSign, int16 zExp, bits64 zSig)
|
||||
{
|
||||
flag roundNearestEven;
|
||||
int16 roundIncrement, roundBits;
|
||||
flag isTiny;
|
||||
|
||||
/* SH4 has only 2 rounding modes - round to nearest and round to zero */
|
||||
roundNearestEven = (float_rounding_mode() == FPSCR_RM_NEAREST);
|
||||
roundIncrement = 0x200;
|
||||
if (!roundNearestEven) {
|
||||
roundIncrement = 0;
|
||||
}
|
||||
roundBits = zSig & 0x3FF;
|
||||
if (0x7FD <= (bits16) zExp) {
|
||||
if ((0x7FD < zExp)
|
||||
|| ((zExp == 0x7FD)
|
||||
&& ((sbits64) (zSig + roundIncrement) < 0))
|
||||
) {
|
||||
float_raise(FPSCR_CAUSE_OVERFLOW | FPSCR_CAUSE_INEXACT);
|
||||
return packFloat64(zSign, 0x7FF,
|
||||
0) - (roundIncrement == 0);
|
||||
}
|
||||
if (zExp < 0) {
|
||||
isTiny = (zExp < -1)
|
||||
|| (zSig + roundIncrement <
|
||||
LIT64(0x8000000000000000));
|
||||
shift64RightJamming(zSig, -zExp, &zSig);
|
||||
zExp = 0;
|
||||
roundBits = zSig & 0x3FF;
|
||||
if (isTiny && roundBits)
|
||||
float_raise(FPSCR_CAUSE_UNDERFLOW);
|
||||
}
|
||||
}
|
||||
if (roundBits)
|
||||
float_raise(FPSCR_CAUSE_INEXACT);
|
||||
zSig = (zSig + roundIncrement) >> 10;
|
||||
zSig &= ~(((roundBits ^ 0x200) == 0) & roundNearestEven);
|
||||
if (zSig == 0)
|
||||
zExp = 0;
|
||||
return packFloat64(zSign, zExp, zSig);
|
||||
|
||||
}
|
||||
|
||||
static float32 subFloat32Sigs(float32 a, float32 b, flag zSign)
|
||||
{
|
||||
int16 aExp, bExp, zExp;
|
||||
bits32 aSig, bSig, zSig;
|
||||
int16 expDiff;
|
||||
|
||||
aSig = extractFloat32Frac(a);
|
||||
aExp = extractFloat32Exp(a);
|
||||
bSig = extractFloat32Frac(b);
|
||||
bExp = extractFloat32Exp(b);
|
||||
expDiff = aExp - bExp;
|
||||
aSig <<= 7;
|
||||
bSig <<= 7;
|
||||
if (0 < expDiff)
|
||||
goto aExpBigger;
|
||||
if (expDiff < 0)
|
||||
goto bExpBigger;
|
||||
if (aExp == 0) {
|
||||
aExp = 1;
|
||||
bExp = 1;
|
||||
}
|
||||
if (bSig < aSig)
|
||||
goto aBigger;
|
||||
if (aSig < bSig)
|
||||
goto bBigger;
|
||||
return packFloat32(float_rounding_mode() == FPSCR_RM_ZERO, 0, 0);
|
||||
bExpBigger:
|
||||
if (bExp == 0xFF) {
|
||||
return packFloat32(zSign ^ 1, 0xFF, 0);
|
||||
}
|
||||
if (aExp == 0) {
|
||||
++expDiff;
|
||||
} else {
|
||||
aSig |= 0x40000000;
|
||||
}
|
||||
shift32RightJamming(aSig, -expDiff, &aSig);
|
||||
bSig |= 0x40000000;
|
||||
bBigger:
|
||||
zSig = bSig - aSig;
|
||||
zExp = bExp;
|
||||
zSign ^= 1;
|
||||
goto normalizeRoundAndPack;
|
||||
aExpBigger:
|
||||
if (aExp == 0xFF) {
|
||||
return a;
|
||||
}
|
||||
if (bExp == 0) {
|
||||
--expDiff;
|
||||
} else {
|
||||
bSig |= 0x40000000;
|
||||
}
|
||||
shift32RightJamming(bSig, expDiff, &bSig);
|
||||
aSig |= 0x40000000;
|
||||
aBigger:
|
||||
zSig = aSig - bSig;
|
||||
zExp = aExp;
|
||||
normalizeRoundAndPack:
|
||||
--zExp;
|
||||
return normalizeRoundAndPackFloat32(zSign, zExp, zSig);
|
||||
|
||||
}
|
||||
|
||||
static float32 addFloat32Sigs(float32 a, float32 b, flag zSign)
|
||||
{
|
||||
int16 aExp, bExp, zExp;
|
||||
bits32 aSig, bSig, zSig;
|
||||
int16 expDiff;
|
||||
|
||||
aSig = extractFloat32Frac(a);
|
||||
aExp = extractFloat32Exp(a);
|
||||
bSig = extractFloat32Frac(b);
|
||||
bExp = extractFloat32Exp(b);
|
||||
expDiff = aExp - bExp;
|
||||
aSig <<= 6;
|
||||
bSig <<= 6;
|
||||
if (0 < expDiff) {
|
||||
if (aExp == 0xFF) {
|
||||
return a;
|
||||
}
|
||||
if (bExp == 0) {
|
||||
--expDiff;
|
||||
} else {
|
||||
bSig |= 0x20000000;
|
||||
}
|
||||
shift32RightJamming(bSig, expDiff, &bSig);
|
||||
zExp = aExp;
|
||||
} else if (expDiff < 0) {
|
||||
if (bExp == 0xFF) {
|
||||
return packFloat32(zSign, 0xFF, 0);
|
||||
}
|
||||
if (aExp == 0) {
|
||||
++expDiff;
|
||||
} else {
|
||||
aSig |= 0x20000000;
|
||||
}
|
||||
shift32RightJamming(aSig, -expDiff, &aSig);
|
||||
zExp = bExp;
|
||||
} else {
|
||||
if (aExp == 0xFF) {
|
||||
return a;
|
||||
}
|
||||
if (aExp == 0)
|
||||
return packFloat32(zSign, 0, (aSig + bSig) >> 6);
|
||||
zSig = 0x40000000 + aSig + bSig;
|
||||
zExp = aExp;
|
||||
goto roundAndPack;
|
||||
}
|
||||
aSig |= 0x20000000;
|
||||
zSig = (aSig + bSig) << 1;
|
||||
--zExp;
|
||||
if ((sbits32) zSig < 0) {
|
||||
zSig = aSig + bSig;
|
||||
++zExp;
|
||||
}
|
||||
roundAndPack:
|
||||
return roundAndPackFloat32(zSign, zExp, zSig);
|
||||
|
||||
}
|
||||
|
||||
float64 float64_sub(float64 a, float64 b)
|
||||
{
|
||||
flag aSign, bSign;
|
||||
|
||||
aSign = extractFloat64Sign(a);
|
||||
bSign = extractFloat64Sign(b);
|
||||
if (aSign == bSign) {
|
||||
return subFloat64Sigs(a, b, aSign);
|
||||
} else {
|
||||
return addFloat64Sigs(a, b, aSign);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
float32 float32_sub(float32 a, float32 b)
|
||||
{
|
||||
flag aSign, bSign;
|
||||
|
||||
aSign = extractFloat32Sign(a);
|
||||
bSign = extractFloat32Sign(b);
|
||||
if (aSign == bSign) {
|
||||
return subFloat32Sigs(a, b, aSign);
|
||||
} else {
|
||||
return addFloat32Sigs(a, b, aSign);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
float32 float32_add(float32 a, float32 b)
|
||||
{
|
||||
flag aSign, bSign;
|
||||
|
||||
aSign = extractFloat32Sign(a);
|
||||
bSign = extractFloat32Sign(b);
|
||||
if (aSign == bSign) {
|
||||
return addFloat32Sigs(a, b, aSign);
|
||||
} else {
|
||||
return subFloat32Sigs(a, b, aSign);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
float64 float64_add(float64 a, float64 b)
|
||||
{
|
||||
flag aSign, bSign;
|
||||
|
||||
aSign = extractFloat64Sign(a);
|
||||
bSign = extractFloat64Sign(b);
|
||||
if (aSign == bSign) {
|
||||
return addFloat64Sigs(a, b, aSign);
|
||||
} else {
|
||||
return subFloat64Sigs(a, b, aSign);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
normalizeFloat64Subnormal(bits64 aSig, int16 * zExpPtr, bits64 * zSigPtr)
|
||||
{
|
||||
int8 shiftCount;
|
||||
|
||||
shiftCount = countLeadingZeros64(aSig) - 11;
|
||||
*zSigPtr = aSig << shiftCount;
|
||||
*zExpPtr = 1 - shiftCount;
|
||||
}
|
||||
|
||||
inline void add128(bits64 a0, bits64 a1, bits64 b0, bits64 b1, bits64 * z0Ptr,
|
||||
bits64 * z1Ptr)
|
||||
{
|
||||
bits64 z1;
|
||||
|
||||
z1 = a1 + b1;
|
||||
*z1Ptr = z1;
|
||||
*z0Ptr = a0 + b0 + (z1 < a1);
|
||||
}
|
||||
|
||||
inline void
|
||||
sub128(bits64 a0, bits64 a1, bits64 b0, bits64 b1, bits64 * z0Ptr,
|
||||
bits64 * z1Ptr)
|
||||
{
|
||||
*z1Ptr = a1 - b1;
|
||||
*z0Ptr = a0 - b0 - (a1 < b1);
|
||||
}
|
||||
|
||||
static bits64 estimateDiv128To64(bits64 a0, bits64 a1, bits64 b)
|
||||
{
|
||||
bits64 b0, b1;
|
||||
bits64 rem0, rem1, term0, term1;
|
||||
bits64 z;
|
||||
if (b <= a0)
|
||||
return LIT64(0xFFFFFFFFFFFFFFFF);
|
||||
b0 = b >> 32;
|
||||
z = (b0 << 32 <= a0) ? LIT64(0xFFFFFFFF00000000) : (a0 / b0) << 32;
|
||||
mul64To128(b, z, &term0, &term1);
|
||||
sub128(a0, a1, term0, term1, &rem0, &rem1);
|
||||
while (((sbits64) rem0) < 0) {
|
||||
z -= LIT64(0x100000000);
|
||||
b1 = b << 32;
|
||||
add128(rem0, rem1, b0, b1, &rem0, &rem1);
|
||||
}
|
||||
rem0 = (rem0 << 32) | (rem1 >> 32);
|
||||
z |= (b0 << 32 <= rem0) ? 0xFFFFFFFF : rem0 / b0;
|
||||
return z;
|
||||
}
|
||||
|
||||
inline void mul64To128(bits64 a, bits64 b, bits64 * z0Ptr, bits64 * z1Ptr)
|
||||
{
|
||||
bits32 aHigh, aLow, bHigh, bLow;
|
||||
bits64 z0, zMiddleA, zMiddleB, z1;
|
||||
|
||||
aLow = a;
|
||||
aHigh = a >> 32;
|
||||
bLow = b;
|
||||
bHigh = b >> 32;
|
||||
z1 = ((bits64) aLow) * bLow;
|
||||
zMiddleA = ((bits64) aLow) * bHigh;
|
||||
zMiddleB = ((bits64) aHigh) * bLow;
|
||||
z0 = ((bits64) aHigh) * bHigh;
|
||||
zMiddleA += zMiddleB;
|
||||
z0 += (((bits64) (zMiddleA < zMiddleB)) << 32) + (zMiddleA >> 32);
|
||||
zMiddleA <<= 32;
|
||||
z1 += zMiddleA;
|
||||
z0 += (z1 < zMiddleA);
|
||||
*z1Ptr = z1;
|
||||
*z0Ptr = z0;
|
||||
|
||||
}
|
||||
|
||||
static void normalizeFloat32Subnormal(bits32 aSig, int16 * zExpPtr,
|
||||
bits32 * zSigPtr)
|
||||
{
|
||||
int8 shiftCount;
|
||||
|
||||
shiftCount = countLeadingZeros32(aSig) - 8;
|
||||
*zSigPtr = aSig << shiftCount;
|
||||
*zExpPtr = 1 - shiftCount;
|
||||
|
||||
}
|
||||
|
||||
float64 float64_div(float64 a, float64 b)
|
||||
{
|
||||
flag aSign, bSign, zSign;
|
||||
int16 aExp, bExp, zExp;
|
||||
bits64 aSig, bSig, zSig;
|
||||
bits64 rem0, rem1;
|
||||
bits64 term0, term1;
|
||||
|
||||
aSig = extractFloat64Frac(a);
|
||||
aExp = extractFloat64Exp(a);
|
||||
aSign = extractFloat64Sign(a);
|
||||
bSig = extractFloat64Frac(b);
|
||||
bExp = extractFloat64Exp(b);
|
||||
bSign = extractFloat64Sign(b);
|
||||
zSign = aSign ^ bSign;
|
||||
if (aExp == 0x7FF) {
|
||||
if (bExp == 0x7FF) {
|
||||
}
|
||||
return packFloat64(zSign, 0x7FF, 0);
|
||||
}
|
||||
if (bExp == 0x7FF) {
|
||||
return packFloat64(zSign, 0, 0);
|
||||
}
|
||||
if (bExp == 0) {
|
||||
if (bSig == 0) {
|
||||
if ((aExp | aSig) == 0) {
|
||||
float_raise(FPSCR_CAUSE_INVALID);
|
||||
}
|
||||
return packFloat64(zSign, 0x7FF, 0);
|
||||
}
|
||||
normalizeFloat64Subnormal(bSig, &bExp, &bSig);
|
||||
}
|
||||
if (aExp == 0) {
|
||||
if (aSig == 0)
|
||||
return packFloat64(zSign, 0, 0);
|
||||
normalizeFloat64Subnormal(aSig, &aExp, &aSig);
|
||||
}
|
||||
zExp = aExp - bExp + 0x3FD;
|
||||
aSig = (aSig | LIT64(0x0010000000000000)) << 10;
|
||||
bSig = (bSig | LIT64(0x0010000000000000)) << 11;
|
||||
if (bSig <= (aSig + aSig)) {
|
||||
aSig >>= 1;
|
||||
++zExp;
|
||||
}
|
||||
zSig = estimateDiv128To64(aSig, 0, bSig);
|
||||
if ((zSig & 0x1FF) <= 2) {
|
||||
mul64To128(bSig, zSig, &term0, &term1);
|
||||
sub128(aSig, 0, term0, term1, &rem0, &rem1);
|
||||
while ((sbits64) rem0 < 0) {
|
||||
--zSig;
|
||||
add128(rem0, rem1, 0, bSig, &rem0, &rem1);
|
||||
}
|
||||
zSig |= (rem1 != 0);
|
||||
}
|
||||
return roundAndPackFloat64(zSign, zExp, zSig);
|
||||
|
||||
}
|
||||
|
||||
float32 float32_div(float32 a, float32 b)
|
||||
{
|
||||
flag aSign, bSign, zSign;
|
||||
int16 aExp, bExp, zExp;
|
||||
bits32 aSig, bSig, zSig;
|
||||
|
||||
aSig = extractFloat32Frac(a);
|
||||
aExp = extractFloat32Exp(a);
|
||||
aSign = extractFloat32Sign(a);
|
||||
bSig = extractFloat32Frac(b);
|
||||
bExp = extractFloat32Exp(b);
|
||||
bSign = extractFloat32Sign(b);
|
||||
zSign = aSign ^ bSign;
|
||||
if (aExp == 0xFF) {
|
||||
if (bExp == 0xFF) {
|
||||
}
|
||||
return packFloat32(zSign, 0xFF, 0);
|
||||
}
|
||||
if (bExp == 0xFF) {
|
||||
return packFloat32(zSign, 0, 0);
|
||||
}
|
||||
if (bExp == 0) {
|
||||
if (bSig == 0) {
|
||||
return packFloat32(zSign, 0xFF, 0);
|
||||
}
|
||||
normalizeFloat32Subnormal(bSig, &bExp, &bSig);
|
||||
}
|
||||
if (aExp == 0) {
|
||||
if (aSig == 0)
|
||||
return packFloat32(zSign, 0, 0);
|
||||
normalizeFloat32Subnormal(aSig, &aExp, &aSig);
|
||||
}
|
||||
zExp = aExp - bExp + 0x7D;
|
||||
aSig = (aSig | 0x00800000) << 7;
|
||||
bSig = (bSig | 0x00800000) << 8;
|
||||
if (bSig <= (aSig + aSig)) {
|
||||
aSig >>= 1;
|
||||
++zExp;
|
||||
}
|
||||
zSig = (((bits64) aSig) << 32) / bSig;
|
||||
if ((zSig & 0x3F) == 0) {
|
||||
zSig |= (((bits64) bSig) * zSig != ((bits64) aSig) << 32);
|
||||
}
|
||||
return roundAndPackFloat32(zSign, zExp, zSig);
|
||||
|
||||
}
|
||||
|
||||
float32 float32_mul(float32 a, float32 b)
|
||||
{
|
||||
char aSign, bSign, zSign;
|
||||
int aExp, bExp, zExp;
|
||||
unsigned int aSig, bSig;
|
||||
unsigned long long zSig64;
|
||||
unsigned int zSig;
|
||||
|
||||
aSig = extractFloat32Frac(a);
|
||||
aExp = extractFloat32Exp(a);
|
||||
aSign = extractFloat32Sign(a);
|
||||
bSig = extractFloat32Frac(b);
|
||||
bExp = extractFloat32Exp(b);
|
||||
bSign = extractFloat32Sign(b);
|
||||
zSign = aSign ^ bSign;
|
||||
if (aExp == 0) {
|
||||
if (aSig == 0)
|
||||
return packFloat32(zSign, 0, 0);
|
||||
normalizeFloat32Subnormal(aSig, &aExp, &aSig);
|
||||
}
|
||||
if (bExp == 0) {
|
||||
if (bSig == 0)
|
||||
return packFloat32(zSign, 0, 0);
|
||||
normalizeFloat32Subnormal(bSig, &bExp, &bSig);
|
||||
}
|
||||
if ((bExp == 0xff && bSig == 0) || (aExp == 0xff && aSig == 0))
|
||||
return roundAndPackFloat32(zSign, 0xff, 0);
|
||||
|
||||
zExp = aExp + bExp - 0x7F;
|
||||
aSig = (aSig | 0x00800000) << 7;
|
||||
bSig = (bSig | 0x00800000) << 8;
|
||||
shift64RightJamming(((unsigned long long)aSig) * bSig, 32, &zSig64);
|
||||
zSig = zSig64;
|
||||
if (0 <= (signed int)(zSig << 1)) {
|
||||
zSig <<= 1;
|
||||
--zExp;
|
||||
}
|
||||
return roundAndPackFloat32(zSign, zExp, zSig);
|
||||
|
||||
}
|
||||
|
||||
float64 float64_mul(float64 a, float64 b)
|
||||
{
|
||||
char aSign, bSign, zSign;
|
||||
int aExp, bExp, zExp;
|
||||
unsigned long long int aSig, bSig, zSig0, zSig1;
|
||||
|
||||
aSig = extractFloat64Frac(a);
|
||||
aExp = extractFloat64Exp(a);
|
||||
aSign = extractFloat64Sign(a);
|
||||
bSig = extractFloat64Frac(b);
|
||||
bExp = extractFloat64Exp(b);
|
||||
bSign = extractFloat64Sign(b);
|
||||
zSign = aSign ^ bSign;
|
||||
|
||||
if (aExp == 0) {
|
||||
if (aSig == 0)
|
||||
return packFloat64(zSign, 0, 0);
|
||||
normalizeFloat64Subnormal(aSig, &aExp, &aSig);
|
||||
}
|
||||
if (bExp == 0) {
|
||||
if (bSig == 0)
|
||||
return packFloat64(zSign, 0, 0);
|
||||
normalizeFloat64Subnormal(bSig, &bExp, &bSig);
|
||||
}
|
||||
if ((aExp == 0x7ff && aSig == 0) || (bExp == 0x7ff && bSig == 0))
|
||||
return roundAndPackFloat64(zSign, 0x7ff, 0);
|
||||
|
||||
zExp = aExp + bExp - 0x3FF;
|
||||
aSig = (aSig | 0x0010000000000000LL) << 10;
|
||||
bSig = (bSig | 0x0010000000000000LL) << 11;
|
||||
mul64To128(aSig, bSig, &zSig0, &zSig1);
|
||||
zSig0 |= (zSig1 != 0);
|
||||
if (0 <= (signed long long int)(zSig0 << 1)) {
|
||||
zSig0 <<= 1;
|
||||
--zExp;
|
||||
}
|
||||
return roundAndPackFloat64(zSign, zExp, zSig0);
|
||||
}
|
||||
|
|
@ -0,0 +1,32 @@
|
|||
/*
|
||||
* linux/arch/sh/kernel/cpu/sh4/sh4_fpu.h
|
||||
*
|
||||
* Copyright (C) 2006 STMicroelectronics Limited
|
||||
* Author: Carl Shaw <carl.shaw@st.com>
|
||||
*
|
||||
* May be copied or modified under the terms of the GNU General Public
|
||||
* License Version 2. See linux/COPYING for more information.
|
||||
*
|
||||
* Definitions for SH4 FPU operations
|
||||
*/
|
||||
|
||||
#ifndef __CPU_SH4_FPU_H
|
||||
#define __CPU_SH4_FPU_H
|
||||
|
||||
#define FPSCR_ENABLE_MASK 0x00000f80UL
|
||||
|
||||
#define FPSCR_FMOV_DOUBLE (1<<1)
|
||||
|
||||
#define FPSCR_CAUSE_INEXACT (1<<12)
|
||||
#define FPSCR_CAUSE_UNDERFLOW (1<<13)
|
||||
#define FPSCR_CAUSE_OVERFLOW (1<<14)
|
||||
#define FPSCR_CAUSE_DIVZERO (1<<15)
|
||||
#define FPSCR_CAUSE_INVALID (1<<16)
|
||||
#define FPSCR_CAUSE_ERROR (1<<17)
|
||||
|
||||
#define FPSCR_DBL_PRECISION (1<<19)
|
||||
#define FPSCR_ROUNDING_MODE(x) ((x >> 20) & 3)
|
||||
#define FPSCR_RM_NEAREST (0)
|
||||
#define FPSCR_RM_ZERO (1)
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue