sh: math-emu support

This implements initial math-emu support, aimed primarily at SH-3.

Signed-off-by: Takashi YOSHII <takasi-y@ops.dti.ne.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Takashi YOSHII 2006-09-27 17:15:32 +09:00 committed by Paul Mundt
parent 317a6104a9
commit 4b565680d1
7 changed files with 918 additions and 39 deletions

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@ -339,6 +339,15 @@ config SH_FPU
This option must be set in order to enable the FPU.
config SH_FPU_EMU
bool "FPU emulation support"
depends on !SH_FPU && EXPERIMENTAL
default n
help
Selecting this option will enable support for software FPU emulation.
Most SH-3 users will want to say Y here, whereas most SH-4 users will
want to say N.
config SH_DSP
bool "DSP support"
depends on !CPU_SH4

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@ -79,6 +79,7 @@ head-y := arch/sh/kernel/head.o arch/sh/kernel/init_task.o
LIBGCC := $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
core-y += arch/sh/kernel/ arch/sh/mm/
core-$(CONFIG_SH_FPU_EMU) += arch/sh/math-emu/
# Boards
machdir-$(CONFIG_SH_SOLUTION_ENGINE) := se/770x

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@ -36,40 +36,15 @@
#ifdef CONFIG_SH_KGDB
#include <asm/kgdb.h>
#define CHK_REMOTE_DEBUG(regs) \
{ \
if ((kgdb_debug_hook != (kgdb_debug_hook_t *) NULL) && (!user_mode(regs))) \
{ \
(*kgdb_debug_hook)(regs); \
} \
#define CHK_REMOTE_DEBUG(regs) \
{ \
if (kgdb_debug_hook && !user_mode(regs))\
(*kgdb_debug_hook)(regs); \
}
#else
#define CHK_REMOTE_DEBUG(regs)
#endif
#define DO_ERROR(trapnr, signr, str, name, tsk) \
asmlinkage void do_##name(unsigned long r4, unsigned long r5, \
unsigned long r6, unsigned long r7, \
struct pt_regs regs) \
{ \
unsigned long error_code; \
\
/* Check if it's a DSP instruction */ \
if (is_dsp_inst(&regs)) { \
/* Enable DSP mode, and restart instruction. */ \
regs.sr |= SR_DSP; \
return; \
} \
\
asm volatile("stc r2_bank, %0": "=r" (error_code)); \
local_irq_enable(); \
tsk->thread.error_code = error_code; \
tsk->thread.trap_no = trapnr; \
CHK_REMOTE_DEBUG(&regs); \
force_sig(signr, tsk); \
die_if_no_fixup(str,&regs,error_code); \
}
#ifdef CONFIG_CPU_SH2
#define TRAP_RESERVED_INST 4
#define TRAP_ILLEGAL_SLOT_INST 6
@ -575,8 +550,117 @@ int is_dsp_inst(struct pt_regs *regs)
#define is_dsp_inst(regs) (0)
#endif /* CONFIG_SH_DSP */
DO_ERROR(TRAP_RESERVED_INST, SIGILL, "reserved instruction", reserved_inst, current)
DO_ERROR(TRAP_ILLEGAL_SLOT_INST, SIGILL, "illegal slot instruction", illegal_slot_inst, current)
extern int do_fpu_inst(unsigned short, struct pt_regs*);
asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
struct pt_regs regs)
{
unsigned long error_code;
struct task_struct *tsk = current;
#ifdef CONFIG_SH_FPU_EMU
unsigned short inst;
int err;
get_user(inst, (unsigned short*)regs.pc);
err = do_fpu_inst(inst, &regs);
if (!err) {
regs.pc += 2;
return;
}
/* not a FPU inst. */
#endif
#ifdef CONFIG_SH_DSP
/* Check if it's a DSP instruction */
if (is_dsp_inst(&regs)) {
/* Enable DSP mode, and restart instruction. */
regs.sr |= SR_DSP;
return;
}
#endif
asm volatile("stc r2_bank, %0": "=r" (error_code));
local_irq_enable();
tsk->thread.error_code = error_code;
tsk->thread.trap_no = TRAP_RESERVED_INST;
CHK_REMOTE_DEBUG(&regs);
force_sig(SIGILL, tsk);
die_if_no_fixup("reserved instruction", &regs, error_code);
}
#ifdef CONFIG_SH_FPU_EMU
static int emulate_branch(unsigned short inst, struct pt_regs* regs)
{
/*
* bfs: 8fxx: PC+=d*2+4;
* bts: 8dxx: PC+=d*2+4;
* bra: axxx: PC+=D*2+4;
* bsr: bxxx: PC+=D*2+4 after PR=PC+4;
* braf:0x23: PC+=Rn*2+4;
* bsrf:0x03: PC+=Rn*2+4 after PR=PC+4;
* jmp: 4x2b: PC=Rn;
* jsr: 4x0b: PC=Rn after PR=PC+4;
* rts: 000b: PC=PR;
*/
if ((inst & 0xfd00) == 0x8d00) {
regs->pc += SH_PC_8BIT_OFFSET(inst);
return 0;
}
if ((inst & 0xe000) == 0xa000) {
regs->pc += SH_PC_12BIT_OFFSET(inst);
return 0;
}
if ((inst & 0xf0df) == 0x0003) {
regs->pc += regs->regs[(inst & 0x0f00) >> 8] + 4;
return 0;
}
if ((inst & 0xf0df) == 0x400b) {
regs->pc = regs->regs[(inst & 0x0f00) >> 8];
return 0;
}
if ((inst & 0xffff) == 0x000b) {
regs->pc = regs->pr;
return 0;
}
return 1;
}
#endif
asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
struct pt_regs regs)
{
unsigned long error_code;
struct task_struct *tsk = current;
#ifdef CONFIG_SH_FPU_EMU
unsigned short inst;
get_user(inst, (unsigned short *)regs.pc + 1);
if (!do_fpu_inst(inst, &regs)) {
get_user(inst, (unsigned short *)regs.pc);
if (!emulate_branch(inst, &regs))
return;
/* fault in branch.*/
}
/* not a FPU inst. */
#endif
asm volatile("stc r2_bank, %0": "=r" (error_code));
local_irq_enable();
tsk->thread.error_code = error_code;
tsk->thread.trap_no = TRAP_RESERVED_INST;
CHK_REMOTE_DEBUG(&regs);
force_sig(SIGILL, tsk);
die_if_no_fixup("illegal slot instruction", &regs, error_code);
}
asmlinkage void do_exception_error(unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
@ -634,14 +718,16 @@ void __init trap_init(void)
exception_handling_table[TRAP_ILLEGAL_SLOT_INST]
= (void *)do_illegal_slot_inst;
#ifdef CONFIG_CPU_SH4
if (!(cpu_data->flags & CPU_HAS_FPU)) {
/* For SH-4 lacking an FPU, treat floating point instructions
as reserved. */
/* entry 64 corresponds to EXPEVT=0x800 */
exception_handling_table[64] = (void *)do_reserved_inst;
exception_handling_table[65] = (void *)do_illegal_slot_inst;
}
#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_FPU) || \
defined(CONFIG_SH_FPU_EMU)
/*
* For SH-4 lacking an FPU, treat floating point instructions as
* reserved. They'll be handled in the math-emu case, or faulted on
* otherwise.
*/
/* entry 64 corresponds to EXPEVT=0x800 */
exception_handling_table[64] = (void *)do_reserved_inst;
exception_handling_table[65] = (void *)do_illegal_slot_inst;
#endif
/* Setup VBR for boot cpu */

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@ -0,0 +1 @@
obj-y := math.o

624
arch/sh/math-emu/math.c Normal file
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@ -0,0 +1,624 @@
/*
* arch/sh/math-emu/math.c
*
* Copyright (C) 2006 Takashi YOSHII <takasi-y@ops.dti.ne.jp>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <asm/io.h>
#include "sfp-util.h"
#include <math-emu/soft-fp.h>
#include <math-emu/single.h>
#include <math-emu/double.h>
#define FPUL (fregs->fpul)
#define FPSCR (fregs->fpscr)
#define FPSCR_RM (FPSCR&3)
#define FPSCR_DN ((FPSCR>>18)&1)
#define FPSCR_PR ((FPSCR>>19)&1)
#define FPSCR_SZ ((FPSCR>>20)&1)
#define FPSCR_FR ((FPSCR>>21)&1)
#define FPSCR_MASK 0x003fffffUL
#define BANK(n) (n^(FPSCR_FR?16:0))
#define FR ((unsigned long*)(fregs->fp_regs))
#define FR0 (FR[BANK(0)])
#define FRn (FR[BANK(n)])
#define FRm (FR[BANK(m)])
#define DR ((unsigned long long*)(fregs->fp_regs))
#define DRn (DR[BANK(n)/2])
#define DRm (DR[BANK(m)/2])
#define XREG(n) (n^16)
#define XFn (FR[BANK(XREG(n))])
#define XFm (FR[BANK(XREG(m))])
#define XDn (DR[BANK(XREG(n))/2])
#define XDm (DR[BANK(XREG(m))/2])
#define R0 (regs->regs[0])
#define Rn (regs->regs[n])
#define Rm (regs->regs[m])
#define WRITE(d,a) ({if(put_user(d, (typeof (d)*)a)) return -EFAULT;})
#define READ(d,a) ({if(get_user(d, (typeof (d)*)a)) return -EFAULT;})
#define PACK_S(r,f) FP_PACK_SP(&r,f)
#define UNPACK_S(f,r) FP_UNPACK_SP(f,&r)
#define PACK_D(r,f) \
{u32 t[2]; FP_PACK_DP(t,f); ((u32*)&r)[0]=t[1]; ((u32*)&r)[1]=t[0];}
#define UNPACK_D(f,r) \
{u32 t[2]; t[0]=((u32*)&r)[1]; t[1]=((u32*)&r)[0]; FP_UNPACK_DP(f,t);}
// 2 args instructions.
#define BOTH_PRmn(op,x) \
FP_DECL_EX; if(FPSCR_PR) op(D,x,DRm,DRn); else op(S,x,FRm,FRn);
#define CMP_X(SZ,R,M,N) do{ \
FP_DECL_##SZ(Fm); FP_DECL_##SZ(Fn); \
UNPACK_##SZ(Fm, M); UNPACK_##SZ(Fn, N); \
FP_CMP_##SZ(R, Fn, Fm, 2); }while(0)
#define EQ_X(SZ,R,M,N) do{ \
FP_DECL_##SZ(Fm); FP_DECL_##SZ(Fn); \
UNPACK_##SZ(Fm, M); UNPACK_##SZ(Fn, N); \
FP_CMP_EQ_##SZ(R, Fn, Fm); }while(0)
#define CMP(OP) ({ int r; BOTH_PRmn(OP##_X,r); r; })
static int
fcmp_gt(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n)
{
if (CMP(CMP) > 0)
regs->sr |= 1;
else
regs->sr &= ~1;
return 0;
}
static int
fcmp_eq(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n)
{
if (CMP(CMP /*EQ*/) == 0)
regs->sr |= 1;
else
regs->sr &= ~1;
return 0;
}
#define ARITH_X(SZ,OP,M,N) do{ \
FP_DECL_##SZ(Fm); FP_DECL_##SZ(Fn); FP_DECL_##SZ(Fr); \
UNPACK_##SZ(Fm, M); UNPACK_##SZ(Fn, N); \
FP_##OP##_##SZ(Fr, Fn, Fm); \
PACK_##SZ(N, Fr); }while(0)
static int
fadd(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n)
{
BOTH_PRmn(ARITH_X, ADD);
return 0;
}
static int
fsub(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n)
{
BOTH_PRmn(ARITH_X, SUB);
return 0;
}
static int
fmul(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n)
{
BOTH_PRmn(ARITH_X, MUL);
return 0;
}
static int
fdiv(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n)
{
BOTH_PRmn(ARITH_X, DIV);
return 0;
}
static int
fmac(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n)
{
FP_DECL_EX;
FP_DECL_S(Fr);
FP_DECL_S(Ft);
FP_DECL_S(F0);
FP_DECL_S(Fm);
FP_DECL_S(Fn);
UNPACK_S(F0, FR0);
UNPACK_S(Fm, FRm);
UNPACK_S(Fn, FRn);
FP_MUL_S(Ft, Fm, F0);
FP_ADD_S(Fr, Fn, Ft);
PACK_S(FRn, Fr);
return 0;
}
// to process fmov's extention (odd n for DR access XD).
#define FMOV_EXT(x) if(x&1) x+=16-1
static int
fmov_idx_reg(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m,
int n)
{
if (FPSCR_SZ) {
FMOV_EXT(n);
READ(FRn, Rm + R0 + 4);
n++;
READ(FRn, Rm + R0);
} else {
READ(FRn, Rm + R0);
}
return 0;
}
static int
fmov_mem_reg(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m,
int n)
{
if (FPSCR_SZ) {
FMOV_EXT(n);
READ(FRn, Rm + 4);
n++;
READ(FRn, Rm);
} else {
READ(FRn, Rm);
}
return 0;
}
static int
fmov_inc_reg(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m,
int n)
{
if (FPSCR_SZ) {
FMOV_EXT(n);
READ(FRn, Rm + 4);
n++;
READ(FRn, Rm);
Rm += 8;
} else {
READ(FRn, Rm);
Rm += 4;
}
return 0;
}
static int
fmov_reg_idx(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m,
int n)
{
if (FPSCR_SZ) {
FMOV_EXT(m);
WRITE(FRm, Rn + R0 + 4);
m++;
WRITE(FRm, Rn + R0);
} else {
WRITE(FRm, Rn + R0);
}
return 0;
}
static int
fmov_reg_mem(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m,
int n)
{
if (FPSCR_SZ) {
FMOV_EXT(m);
WRITE(FRm, Rn + 4);
m++;
WRITE(FRm, Rn);
} else {
WRITE(FRm, Rn);
}
return 0;
}
static int
fmov_reg_dec(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m,
int n)
{
if (FPSCR_SZ) {
FMOV_EXT(m);
Rn -= 8;
WRITE(FRm, Rn + 4);
m++;
WRITE(FRm, Rn);
} else {
Rn -= 4;
WRITE(FRm, Rn);
}
return 0;
}
static int
fmov_reg_reg(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m,
int n)
{
if (FPSCR_SZ) {
FMOV_EXT(m);
FMOV_EXT(n);
DRn = DRm;
} else {
FRn = FRm;
}
return 0;
}
static int
fnop_mn(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n)
{
return -EINVAL;
}
// 1 arg instructions.
#define NOTYETn(i) static int i(struct sh_fpu_soft_struct *fregs, int n) \
{ printk( #i " not yet done.\n"); return 0; }
NOTYETn(ftrv)
NOTYETn(fsqrt)
NOTYETn(fipr)
NOTYETn(fsca)
NOTYETn(fsrra)
#define EMU_FLOAT_X(SZ,N) do { \
FP_DECL_##SZ(Fn); \
FP_FROM_INT_##SZ(Fn, FPUL, 32, int); \
PACK_##SZ(N, Fn); }while(0)
static int ffloat(struct sh_fpu_soft_struct *fregs, int n)
{
FP_DECL_EX;
if (FPSCR_PR)
EMU_FLOAT_X(D, DRn);
else
EMU_FLOAT_X(S, FRn);
return 0;
}
#define EMU_FTRC_X(SZ,N) do { \
FP_DECL_##SZ(Fn); \
UNPACK_##SZ(Fn, N); \
FP_TO_INT_##SZ(FPUL, Fn, 32, 1); }while(0)
static int ftrc(struct sh_fpu_soft_struct *fregs, int n)
{
FP_DECL_EX;
if (FPSCR_PR)
EMU_FTRC_X(D, DRn);
else
EMU_FTRC_X(S, FRn);
return 0;
}
static int fcnvsd(struct sh_fpu_soft_struct *fregs, int n)
{
FP_DECL_EX;
FP_DECL_S(Fn);
FP_DECL_D(Fr);
UNPACK_S(Fn, FPUL);
FP_CONV(D, S, 2, 1, Fr, Fn);
PACK_D(DRn, Fr);
return 0;
}
static int fcnvds(struct sh_fpu_soft_struct *fregs, int n)
{
FP_DECL_EX;
FP_DECL_D(Fn);
FP_DECL_S(Fr);
UNPACK_D(Fn, DRn);
FP_CONV(S, D, 1, 2, Fr, Fn);
PACK_S(FPUL, Fr);
return 0;
}
static int fxchg(struct sh_fpu_soft_struct *fregs, int flag)
{
FPSCR ^= flag;
return 0;
}
static int fsts(struct sh_fpu_soft_struct *fregs, int n)
{
FRn = FPUL;
return 0;
}
static int flds(struct sh_fpu_soft_struct *fregs, int n)
{
FPUL = FRn;
return 0;
}
static int fneg(struct sh_fpu_soft_struct *fregs, int n)
{
FRn ^= (1 << (_FP_W_TYPE_SIZE - 1));
return 0;
}
static int fabs(struct sh_fpu_soft_struct *fregs, int n)
{
FRn &= ~(1 << (_FP_W_TYPE_SIZE - 1));
return 0;
}
static int fld0(struct sh_fpu_soft_struct *fregs, int n)
{
FRn = 0;
return 0;
}
static int fld1(struct sh_fpu_soft_struct *fregs, int n)
{
FRn = (_FP_EXPBIAS_S << (_FP_FRACBITS_S - 1));
return 0;
}
static int fnop_n(struct sh_fpu_soft_struct *fregs, int n)
{
return -EINVAL;
}
/// Instruction decoders.
static int id_fxfd(struct sh_fpu_soft_struct *, int);
static int id_fnxd(struct sh_fpu_soft_struct *, struct pt_regs *, int, int);
static int (*fnxd[])(struct sh_fpu_soft_struct *, int) = {
fsts, flds, ffloat, ftrc, fneg, fabs, fsqrt, fsrra,
fld0, fld1, fcnvsd, fcnvds, fnop_n, fnop_n, fipr, id_fxfd
};
static int (*fnmx[])(struct sh_fpu_soft_struct *, struct pt_regs *, int, int) = {
fadd, fsub, fmul, fdiv, fcmp_eq, fcmp_gt, fmov_idx_reg, fmov_reg_idx,
fmov_mem_reg, fmov_inc_reg, fmov_reg_mem, fmov_reg_dec,
fmov_reg_reg, id_fnxd, fmac, fnop_mn};
static int id_fxfd(struct sh_fpu_soft_struct *fregs, int x)
{
const int flag[] = { FPSCR_SZ, FPSCR_PR, FPSCR_FR, 0 };
switch (x & 3) {
case 3:
fxchg(fregs, flag[x >> 2]);
break;
case 1:
ftrv(fregs, x - 1);
break;
default:
fsca(fregs, x);
}
return 0;
}
static int
id_fnxd(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int x, int n)
{
return (fnxd[x])(fregs, n);
}
static int
id_fnmx(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, u16 code)
{
int n = (code >> 8) & 0xf, m = (code >> 4) & 0xf, x = code & 0xf;
return (fnmx[x])(fregs, regs, m, n);
}
static int
id_sys(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, u16 code)
{
int n = ((code >> 8) & 0xf);
unsigned long *reg = (code & 0x0010) ? &FPUL : &FPSCR;
switch (code & 0xf0ff) {
case 0x005a:
case 0x006a:
Rn = *reg;
break;
case 0x405a:
case 0x406a:
*reg = Rn;
break;
case 0x4052:
case 0x4062:
Rn -= 4;
WRITE(*reg, Rn);
break;
case 0x4056:
case 0x4066:
READ(*reg, Rn);
Rn += 4;
break;
default:
return -EINVAL;
}
return 0;
}
static int fpu_emulate(u16 code, struct sh_fpu_soft_struct *fregs, struct pt_regs *regs)
{
if ((code & 0xf000) == 0xf000)
return id_fnmx(fregs, regs, code);
else
return id_sys(fregs, regs, code);
}
/**
* denormal_to_double - Given denormalized float number,
* store double float
*
* @fpu: Pointer to sh_fpu_hard structure
* @n: Index to FP register
*/
static void denormal_to_double(struct sh_fpu_hard_struct *fpu, int n)
{
unsigned long du, dl;
unsigned long x = fpu->fpul;
int exp = 1023 - 126;
if (x != 0 && (x & 0x7f800000) == 0) {
du = (x & 0x80000000);
while ((x & 0x00800000) == 0) {
x <<= 1;
exp--;
}
x &= 0x007fffff;
du |= (exp << 20) | (x >> 3);
dl = x << 29;
fpu->fp_regs[n] = du;
fpu->fp_regs[n+1] = dl;
}
}
/**
* ieee_fpe_handler - Handle denormalized number exception
*
* @regs: Pointer to register structure
*
* Returns 1 when it's handled (should not cause exception).
*/
static int ieee_fpe_handler(struct pt_regs *regs)
{
unsigned short insn = *(unsigned short *)regs->pc;
unsigned short finsn;
unsigned long nextpc;
int nib[4] = {
(insn >> 12) & 0xf,
(insn >> 8) & 0xf,
(insn >> 4) & 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 (regs->sr & 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 */
if (regs->sr & 1)
nextpc = regs->pc + 4;
else
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 */
nextpc = regs->regs[nib[1]];
finsn = *(unsigned short *) (regs->pc + 2);
} else if (nib[0] == 0x0 && nib[3] == 0x3 &&
(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 */
nextpc = regs->pr;
finsn = *(unsigned short *) (regs->pc + 2);
} else {
nextpc = regs->pc + 2;
finsn = insn;
}
if ((finsn & 0xf1ff) == 0xf0ad) { /* fcnvsd */
struct task_struct *tsk = current;
if ((tsk->thread.fpu.hard.fpscr & (1 << 17))) {
/* FPU error */
denormal_to_double (&tsk->thread.fpu.hard,
(finsn >> 8) & 0xf);
tsk->thread.fpu.hard.fpscr &=
~(FPSCR_CAUSE_MASK | FPSCR_FLAG_MASK);
set_tsk_thread_flag(tsk, TIF_USEDFPU);
} else {
tsk->thread.trap_no = 11;
tsk->thread.error_code = 0;
force_sig(SIGFPE, tsk);
}
regs->pc = nextpc;
return 1;
}
return 0;
}
asmlinkage void do_fpu_error(unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
struct pt_regs regs)
{
struct task_struct *tsk = current;
if (ieee_fpe_handler (&regs))
return;
regs.pc += 2;
tsk->thread.trap_no = 11;
tsk->thread.error_code = 0;
force_sig(SIGFPE, tsk);
}
/**
* fpu_init - Initialize FPU registers
* @fpu: Pointer to software emulated FPU registers.
*/
static void fpu_init(struct sh_fpu_soft_struct *fpu)
{
int i;
fpu->fpscr = FPSCR_INIT;
fpu->fpul = 0;
for (i = 0; i < 16; i++) {
fpu->fp_regs[i] = 0;
fpu->xfp_regs[i]= 0;
}
}
/**
* do_fpu_inst - Handle reserved instructions for FPU emulation
* @inst: instruction code.
* @regs: registers on stack.
*/
int do_fpu_inst(unsigned short inst, struct pt_regs *regs)
{
struct task_struct *tsk = current;
struct sh_fpu_soft_struct *fpu = &(tsk->thread.fpu.soft);
if (!test_tsk_thread_flag(tsk, TIF_USEDFPU)) {
/* initialize once. */
fpu_init(fpu);
set_tsk_thread_flag(tsk, TIF_USEDFPU);
}
return fpu_emulate(inst, fpu, regs);
}

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@ -0,0 +1,72 @@
/*
* These are copied from glibc/stdlib/longlong.h
*/
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
do { \
UWtype __x; \
__x = (al) + (bl); \
(sh) = (ah) + (bh) + (__x < (al)); \
(sl) = __x; \
} while (0)
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
do { \
UWtype __x; \
__x = (al) - (bl); \
(sh) = (ah) - (bh) - (__x > (al)); \
(sl) = __x; \
} while (0)
#define umul_ppmm(w1, w0, u, v) \
__asm__ ("dmulu.l %2,%3\n\tsts macl,%1\n\tsts mach,%0" \
: "=r" ((u32)(w1)), "=r" ((u32)(w0)) \
: "r" ((u32)(u)), "r" ((u32)(v)) \
: "macl", "mach")
#define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2))
#define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1))
#define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2))
#define udiv_qrnnd(q, r, n1, n0, d) \
do { \
UWtype __d1, __d0, __q1, __q0; \
UWtype __r1, __r0, __m; \
__d1 = __ll_highpart (d); \
__d0 = __ll_lowpart (d); \
\
__r1 = (n1) % __d1; \
__q1 = (n1) / __d1; \
__m = (UWtype) __q1 * __d0; \
__r1 = __r1 * __ll_B | __ll_highpart (n0); \
if (__r1 < __m) \
{ \
__q1--, __r1 += (d); \
if (__r1 >= (d)) /* i.e. we didn't get carry when adding to __r1 */\
if (__r1 < __m) \
__q1--, __r1 += (d); \
} \
__r1 -= __m; \
\
__r0 = __r1 % __d1; \
__q0 = __r1 / __d1; \
__m = (UWtype) __q0 * __d0; \
__r0 = __r0 * __ll_B | __ll_lowpart (n0); \
if (__r0 < __m) \
{ \
__q0--, __r0 += (d); \
if (__r0 >= (d)) \
if (__r0 < __m) \
__q0--, __r0 += (d); \
} \
__r0 -= __m; \
\
(q) = (UWtype) __q1 * __ll_B | __q0; \
(r) = __r0; \
} while (0)
#define abort() return 0
#define __BYTE_ORDER __LITTLE_ENDIAN

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@ -0,0 +1,86 @@
/* Machine-dependent software floating-point definitions.
SuperH kernel version.
Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson (rth@cygnus.com),
Jakub Jelinek (jj@ultra.linux.cz),
David S. Miller (davem@redhat.com) and
Peter Maydell (pmaydell@chiark.greenend.org.uk).
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef _SFP_MACHINE_H
#define _SFP_MACHINE_H
#include <linux/config.h>
#define _FP_W_TYPE_SIZE 32
#define _FP_W_TYPE unsigned long
#define _FP_WS_TYPE signed long
#define _FP_I_TYPE long
#define _FP_MUL_MEAT_S(R,X,Y) \
_FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
#define _FP_MUL_MEAT_D(R,X,Y) \
_FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
#define _FP_MUL_MEAT_Q(R,X,Y) \
_FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
#define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_udiv(S,R,X,Y)
#define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_2_udiv(D,R,X,Y)
#define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
#define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1
#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
#define _FP_NANSIGN_S 0
#define _FP_NANSIGN_D 0
#define _FP_NANSIGN_Q 0
#define _FP_KEEPNANFRACP 1
/*
* If one NaN is signaling and the other is not,
* we choose that one, otherwise we choose X.
*/
#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
do { \
if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs) \
&& !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)) \
{ \
R##_s = Y##_s; \
_FP_FRAC_COPY_##wc(R,Y); \
} \
else \
{ \
R##_s = X##_s; \
_FP_FRAC_COPY_##wc(R,X); \
} \
R##_c = FP_CLS_NAN; \
} while (0)
//#define FP_ROUNDMODE FPSCR_RM
#define FP_DENORM_ZERO 1/*FPSCR_DN*/
/* Exception flags. */
#define FP_EX_INVALID (1<<4)
#define FP_EX_DIVZERO (1<<3)
#define FP_EX_OVERFLOW (1<<2)
#define FP_EX_UNDERFLOW (1<<1)
#define FP_EX_INEXACT (1<<0)
#endif