forked from luck/tmp_suning_uos_patched
73383f670d
[ Upstream commit e25c252a9b033523c626f039d4b9a304f12f6775 ]
Delete ieee_fpe_handler() since it is not used. After that is done,
delete denormal_to_double() since it is not used:
.../arch/sh/math-emu/math.c:505:12: error: 'ieee_fpe_handler' defined but not used [-Werror=unused-function]
505 | static int ieee_fpe_handler(struct pt_regs *regs)
.../arch/sh/math-emu/math.c:477:13: error: 'denormal_to_double' defined but not used [-Werror=unused-function]
477 | static void denormal_to_double(struct sh_fpu_soft_struct *fpu, int n)
Fixes: 7caf62de25 ("sh: remove unused do_fpu_error")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Takashi YOSHII <takasi-y@ops.dti.ne.jp>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rich Felker <dalias@libc.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
507 lines
9.8 KiB
C
507 lines
9.8 KiB
C
/*
|
|
* 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/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sched/signal.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/perf_event.h>
|
|
|
|
#include <linux/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 extension (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);
|
|
}
|
|
|
|
/**
|
|
* 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.xstate->softfpu);
|
|
|
|
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0);
|
|
|
|
if (!(task_thread_info(tsk)->status & TS_USEDFPU)) {
|
|
/* initialize once. */
|
|
fpu_init(fpu);
|
|
task_thread_info(tsk)->status |= TS_USEDFPU;
|
|
}
|
|
|
|
return fpu_emulate(inst, fpu, regs);
|
|
}
|