Viewing file:  math-emu.h (6.74 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_M68K_SETUP_H
#define _ASM_M68K_SETUP_H
#include <asm/setup.h>
#include <linux/linkage.h>
/* Status Register bits */
/* accrued exception bits */
#define FPSR_AEXC_INEX 3
#define FPSR_AEXC_DZ 4
#define FPSR_AEXC_UNFL 5
#define FPSR_AEXC_OVFL 6
#define FPSR_AEXC_IOP 7
/* exception status bits */
#define FPSR_EXC_INEX1 8
#define FPSR_EXC_INEX2 9
#define FPSR_EXC_DZ 10
#define FPSR_EXC_UNFL 11
#define FPSR_EXC_OVFL 12
#define FPSR_EXC_OPERR 13
#define FPSR_EXC_SNAN 14
#define FPSR_EXC_BSUN 15
/* quotient byte, assumes big-endian, of course */
#define FPSR_QUOTIENT(fpsr) (*((signed char *) &(fpsr) + 1))
/* condition code bits */
#define FPSR_CC_NAN 24
#define FPSR_CC_INF 25
#define FPSR_CC_Z 26
#define FPSR_CC_NEG 27
/* Control register bits */
/* rounding mode */
#define FPCR_ROUND_RN 0 /* round to nearest/even */
#define FPCR_ROUND_RZ 1 /* round to zero */
#define FPCR_ROUND_RM 2 /* minus infinity */
#define FPCR_ROUND_RP 3 /* plus infinity */
/* rounding precision */
#define FPCR_PRECISION_X 0 /* long double */
#define FPCR_PRECISION_S 1 /* double */
#define FPCR_PRECISION_D 2 /* float */
/* Flags to select the debugging output */
#define PDECODE 0
#define PEXECUTE 1
#define PCONV 2
#define PNORM 3
#define PREGISTER 4
#define PINSTR 5
#define PUNIMPL 6
#define PMOVEM 7
#define PMDECODE (1<<PDECODE)
#define PMEXECUTE (1<<PEXECUTE)
#define PMCONV (1<<PCONV)
#define PMNORM (1<<PNORM)
#define PMREGISTER (1<<PREGISTER)
#define PMINSTR (1<<PINSTR)
#define PMUNIMPL (1<<PUNIMPL)
#define PMMOVEM (1<<PMOVEM)
#ifndef __ASSEMBLY__
#include <linux/kernel.h>
#include <linux/sched.h>
union fp_mant64 {
unsigned long long m64;
unsigned long m32[2];
};
union fp_mant128 {
unsigned long long m64[2];
unsigned long m32[4];
};
/* internal representation of extended fp numbers */
struct fp_ext {
unsigned char lowmant;
unsigned char sign;
unsigned short exp;
union fp_mant64 mant;
};
/* C representation of FPU registers */
/* NOTE: if you change this, you have to change the assembler offsets
below and the size in <asm/fpu.h>, too */
struct fp_data {
struct fp_ext fpreg[8];
unsigned int fpcr;
unsigned int fpsr;
unsigned int fpiar;
unsigned short prec;
unsigned short rnd;
struct fp_ext temp[2];
};
#ifdef FPU_EMU_DEBUG
extern unsigned int fp_debugprint;
#define dprint(bit, fmt, ...) ({ \
if (fp_debugprint & (1 << (bit))) \
pr_info(fmt, ##__VA_ARGS__); \
})
#else
#define dprint(bit, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
#endif
#define uprint(str) ({ \
static int __count = 3; \
\
if (__count > 0) { \
pr_err("You just hit an unimplemented " \
"fpu instruction (%s)\n", str); \
pr_err("Please report this to ....\n"); \
__count--; \
} \
})
#define FPDATA ((struct fp_data *)current->thread.fp)
#else /* __ASSEMBLY__ */
#define FPDATA %a2
/* offsets from the base register to the floating point data in the task struct */
#define FPD_FPREG (TASK_THREAD+THREAD_FPREG+0)
#define FPD_FPCR (TASK_THREAD+THREAD_FPREG+96)
#define FPD_FPSR (TASK_THREAD+THREAD_FPREG+100)
#define FPD_FPIAR (TASK_THREAD+THREAD_FPREG+104)
#define FPD_PREC (TASK_THREAD+THREAD_FPREG+108)
#define FPD_RND (TASK_THREAD+THREAD_FPREG+110)
#define FPD_TEMPFP1 (TASK_THREAD+THREAD_FPREG+112)
#define FPD_TEMPFP2 (TASK_THREAD+THREAD_FPREG+124)
#define FPD_SIZEOF (TASK_THREAD+THREAD_FPREG+136)
/* offsets on the stack to access saved registers,
* these are only used during instruction decoding
* where we always know how deep we're on the stack.
*/
#define FPS_DO (PT_OFF_D0)
#define FPS_D1 (PT_OFF_D1)
#define FPS_D2 (PT_OFF_D2)
#define FPS_A0 (PT_OFF_A0)
#define FPS_A1 (PT_OFF_A1)
#define FPS_A2 (PT_OFF_A2)
#define FPS_SR (PT_OFF_SR)
#define FPS_PC (PT_OFF_PC)
#define FPS_EA (PT_OFF_PC+6)
#define FPS_PC2 (PT_OFF_PC+10)
.macro fp_get_fp_reg
lea (FPD_FPREG,FPDATA,%d0.w*4),%a0
lea (%a0,%d0.w*8),%a0
.endm
/* Macros used to get/put the current program counter.
* 020/030 use a different stack frame then 040/060, for the
* 040/060 the return pc points already to the next location,
* so this only needs to be modified for jump instructions.
*/
.macro fp_get_pc dest
move.l (FPS_PC+4,%sp),\dest
.endm
.macro fp_put_pc src,jump=0
move.l \src,(FPS_PC+4,%sp)
.endm
.macro fp_get_instr_data f,s,dest,label
getuser \f,%sp@(FPS_PC+4)@(0),\dest,\label,%sp@(FPS_PC+4)
addq.l #\s,%sp@(FPS_PC+4)
.endm
.macro fp_get_instr_word dest,label,addr
fp_get_instr_data w,2,\dest,\label,\addr
.endm
.macro fp_get_instr_long dest,label,addr
fp_get_instr_data l,4,\dest,\label,\addr
.endm
/* These macros are used to read from/write to user space
* on error we jump to the fixup section, load the fault
* address into %a0 and jump to the exit.
* (derived from <asm/uaccess.h>)
*/
.macro getuser size,src,dest,label,addr
| printf ,"[\size<%08x]",1,\addr
.Lu1\@: moves\size \src,\dest
.section .fixup,"ax"
.even
.Lu2\@: move.l \addr,%a0
jra \label
.previous
.section __ex_table,"a"
.align 4
.long .Lu1\@,.Lu2\@
.previous
.endm
.macro putuser size,src,dest,label,addr
| printf ,"[\size>%08x]",1,\addr
.Lu1\@: moves\size \src,\dest
.Lu2\@:
.section .fixup,"ax"
.even
.Lu3\@: move.l \addr,%a0
jra \label
.previous
.section __ex_table,"a"
.align 4
.long .Lu1\@,.Lu3\@
.long .Lu2\@,.Lu3\@
.previous
.endm
/* work around binutils idiocy */
old_gas=-1
.irp gas_ident.x .x
old_gas=old_gas+1
.endr
.if !old_gas
.irp m b,w,l
.macro getuser.\m src,dest,label,addr
getuser .\m,\src,\dest,\label,\addr
.endm
.macro putuser.\m src,dest,label,addr
putuser .\m,\src,\dest,\label,\addr
.endm
.endr
.endif
.macro movestack nr,arg1,arg2,arg3,arg4,arg5
.if \nr
movestack (\nr-1),\arg2,\arg3,\arg4,\arg5
move.l \arg1,-(%sp)
.endif
.endm
.macro printf bit=-1,string,nr=0,arg1,arg2,arg3,arg4,arg5
#ifdef FPU_EMU_DEBUG
.data
.Lpdata\@:
.string "\string"
.previous
movem.l %d0/%d1/%a0/%a1,-(%sp)
.if \bit+1
#if 0
moveq #\bit,%d0
andw #7,%d0
btst %d0,fp_debugprint+((31-\bit)/8)
#else
btst #\bit,fp_debugprint+((31-\bit)/8)
#endif
jeq .Lpskip\@
.endif
movestack \nr,\arg1,\arg2,\arg3,\arg4,\arg5
pea .Lpdata\@
jsr printk
lea ((\nr+1)*4,%sp),%sp
.Lpskip\@:
movem.l (%sp)+,%d0/%d1/%a0/%a1
#endif
.endm
.macro printx bit,fp
#ifdef FPU_EMU_DEBUG
movem.l %d0/%a0,-(%sp)
lea \fp,%a0
#if 0
moveq #'+',%d0
tst.w (%a0)
jeq .Lx1\@
moveq #'-',%d0
.Lx1\@: printf \bit," %c",1,%d0
move.l (4,%a0),%d0
bclr #31,%d0
jne .Lx2\@
printf \bit,"0."
jra .Lx3\@
.Lx2\@: printf \bit,"1."
.Lx3\@: printf \bit,"%08x%08x",2,%d0,%a0@(8)
move.w (2,%a0),%d0
ext.l %d0
printf \bit,"E%04x",1,%d0
#else
printf \bit," %08x%08x%08x",3,%a0@,%a0@(4),%a0@(8)
#endif
movem.l (%sp)+,%d0/%a0
#endif
.endm
.macro debug instr,args
#ifdef FPU_EMU_DEBUG
\instr \args
#endif
.endm
#endif /* __ASSEMBLY__ */
#endif /* _ASM_M68K_SETUP_H */
|