303 lines
6.4 KiB
C
303 lines
6.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_MATH_EMU_H
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#define _ASM_MATH_EMU_H
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#include <asm/setup.h>
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#include <linux/linkage.h>
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/* Status Register bits */
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/* accrued exception bits */
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#define FPSR_AEXC_INEX 3
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#define FPSR_AEXC_DZ 4
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#define FPSR_AEXC_UNFL 5
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#define FPSR_AEXC_OVFL 6
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#define FPSR_AEXC_IOP 7
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/* exception status bits */
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#define FPSR_EXC_INEX1 8
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#define FPSR_EXC_INEX2 9
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#define FPSR_EXC_DZ 10
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#define FPSR_EXC_UNFL 11
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#define FPSR_EXC_OVFL 12
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#define FPSR_EXC_OPERR 13
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#define FPSR_EXC_SNAN 14
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#define FPSR_EXC_BSUN 15
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/* quotient byte, assumes big-endian, of course */
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#define FPSR_QUOTIENT(fpsr) (*((signed char *) &(fpsr) + 1))
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/* condition code bits */
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#define FPSR_CC_NAN 24
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#define FPSR_CC_INF 25
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#define FPSR_CC_Z 26
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#define FPSR_CC_NEG 27
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/* Control register bits */
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/* rounding mode */
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#define FPCR_ROUND_RN 0 /* round to nearest/even */
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#define FPCR_ROUND_RZ 1 /* round to zero */
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#define FPCR_ROUND_RM 2 /* minus infinity */
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#define FPCR_ROUND_RP 3 /* plus infinity */
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/* rounding precision */
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#define FPCR_PRECISION_X 0 /* long double */
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#define FPCR_PRECISION_S 1 /* double */
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#define FPCR_PRECISION_D 2 /* float */
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/* Flags to select the debugging output */
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#define PDECODE 0
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#define PEXECUTE 1
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#define PCONV 2
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#define PNORM 3
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#define PREGISTER 4
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#define PINSTR 5
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#define PUNIMPL 6
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#define PMOVEM 7
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#define PMDECODE (1<<PDECODE)
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#define PMEXECUTE (1<<PEXECUTE)
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#define PMCONV (1<<PCONV)
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#define PMNORM (1<<PNORM)
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#define PMREGISTER (1<<PREGISTER)
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#define PMINSTR (1<<PINSTR)
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#define PMUNIMPL (1<<PUNIMPL)
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#define PMMOVEM (1<<PMOVEM)
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#ifndef __ASSEMBLY__
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#include <linux/kernel.h>
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#include <linux/sched.h>
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union fp_mant64 {
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unsigned long long m64;
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unsigned long m32[2];
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};
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union fp_mant128 {
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unsigned long long m64[2];
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unsigned long m32[4];
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};
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/* internal representation of extended fp numbers */
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struct fp_ext {
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unsigned char lowmant;
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unsigned char sign;
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unsigned short exp;
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union fp_mant64 mant;
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};
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/* C representation of FPU registers */
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/* NOTE: if you change this, you have to change the assembler offsets
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below and the size in <asm/fpu.h>, too */
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struct fp_data {
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struct fp_ext fpreg[8];
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unsigned int fpcr;
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unsigned int fpsr;
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unsigned int fpiar;
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unsigned short prec;
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unsigned short rnd;
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struct fp_ext temp[2];
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};
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#if FPU_EMU_DEBUG
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extern unsigned int fp_debugprint;
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#define dprint(bit, fmt, args...) ({ \
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if (fp_debugprint & (1 << (bit))) \
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printk(fmt, ## args); \
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})
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#else
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#define dprint(bit, fmt, args...)
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#endif
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#define uprint(str) ({ \
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static int __count = 3; \
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\
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if (__count > 0) { \
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printk("You just hit an unimplemented " \
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"fpu instruction (%s)\n", str); \
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printk("Please report this to ....\n"); \
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__count--; \
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} \
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})
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#define FPDATA ((struct fp_data *)current->thread.fp)
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#else /* __ASSEMBLY__ */
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#define FPDATA %a2
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/* offsets from the base register to the floating point data in the task struct */
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#define FPD_FPREG (TASK_THREAD+THREAD_FPREG+0)
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#define FPD_FPCR (TASK_THREAD+THREAD_FPREG+96)
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#define FPD_FPSR (TASK_THREAD+THREAD_FPREG+100)
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#define FPD_FPIAR (TASK_THREAD+THREAD_FPREG+104)
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#define FPD_PREC (TASK_THREAD+THREAD_FPREG+108)
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#define FPD_RND (TASK_THREAD+THREAD_FPREG+110)
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#define FPD_TEMPFP1 (TASK_THREAD+THREAD_FPREG+112)
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#define FPD_TEMPFP2 (TASK_THREAD+THREAD_FPREG+124)
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#define FPD_SIZEOF (TASK_THREAD+THREAD_FPREG+136)
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/* offsets on the stack to access saved registers,
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* these are only used during instruction decoding
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* where we always know how deep we're on the stack.
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*/
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#define FPS_DO (PT_D0)
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#define FPS_D1 (PT_D1)
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#define FPS_D2 (PT_D2)
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#define FPS_A0 (PT_A0)
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#define FPS_A1 (PT_A1)
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#define FPS_A2 (PT_A2)
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#define FPS_SR (PT_SR)
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#define FPS_PC (PT_PC)
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#define FPS_EA (PT_PC+6)
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#define FPS_PC2 (PT_PC+10)
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.macro fp_get_fp_reg
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lea (FPD_FPREG,FPDATA,%d0.w*4),%a0
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lea (%a0,%d0.w*8),%a0
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.endm
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/* Macros used to get/put the current program counter.
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* 020/030 use a different stack frame then 040/060, for the
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* 040/060 the return pc points already to the next location,
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* so this only needs to be modified for jump instructions.
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*/
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.macro fp_get_pc dest
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move.l (FPS_PC+4,%sp),\dest
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.endm
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.macro fp_put_pc src,jump=0
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move.l \src,(FPS_PC+4,%sp)
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.endm
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.macro fp_get_instr_data f,s,dest,label
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getuser \f,%sp@(FPS_PC+4)@(0),\dest,\label,%sp@(FPS_PC+4)
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addq.l #\s,%sp@(FPS_PC+4)
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.endm
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.macro fp_get_instr_word dest,label,addr
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fp_get_instr_data w,2,\dest,\label,\addr
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.endm
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.macro fp_get_instr_long dest,label,addr
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fp_get_instr_data l,4,\dest,\label,\addr
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.endm
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/* These macros are used to read from/write to user space
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* on error we jump to the fixup section, load the fault
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* address into %a0 and jump to the exit.
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* (derived from <asm/uaccess.h>)
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*/
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.macro getuser size,src,dest,label,addr
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| printf ,"[\size<%08x]",1,\addr
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.Lu1\@: moves\size \src,\dest
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.section .fixup,"ax"
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.even
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.Lu2\@: move.l \addr,%a0
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jra \label
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.previous
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.section __ex_table,"a"
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.align 4
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.long .Lu1\@,.Lu2\@
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.previous
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.endm
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.macro putuser size,src,dest,label,addr
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| printf ,"[\size>%08x]",1,\addr
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.Lu1\@: moves\size \src,\dest
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.Lu2\@:
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.section .fixup,"ax"
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.even
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.Lu3\@: move.l \addr,%a0
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jra \label
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.previous
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.section __ex_table,"a"
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.align 4
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.long .Lu1\@,.Lu3\@
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.long .Lu2\@,.Lu3\@
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.previous
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.endm
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.macro movestack nr,arg1,arg2,arg3,arg4,arg5
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.if \nr
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movestack (\nr-1),\arg2,\arg3,\arg4,\arg5
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move.l \arg1,-(%sp)
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.endif
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.endm
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.macro printf bit=-1,string,nr=0,arg1,arg2,arg3,arg4,arg5
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#ifdef FPU_EMU_DEBUG
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.data
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.Lpdata\@:
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.string "\string"
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.previous
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movem.l %d0/%d1/%a0/%a1,-(%sp)
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.if \bit+1
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#if 0
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moveq #\bit,%d0
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andw #7,%d0
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btst %d0,fp_debugprint+((31-\bit)/8)
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#else
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btst #\bit,fp_debugprint+((31-\bit)/8)
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#endif
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jeq .Lpskip\@
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.endif
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movestack \nr,\arg1,\arg2,\arg3,\arg4,\arg5
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pea .Lpdata\@
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jsr printk
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lea ((\nr+1)*4,%sp),%sp
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.Lpskip\@:
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movem.l (%sp)+,%d0/%d1/%a0/%a1
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#endif
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.endm
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.macro printx bit,fp
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#ifdef FPU_EMU_DEBUG
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movem.l %d0/%a0,-(%sp)
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lea \fp,%a0
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#if 0
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moveq #'+',%d0
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tst.w (%a0)
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jeq .Lx1\@
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moveq #'-',%d0
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.Lx1\@: printf \bit," %c",1,%d0
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move.l (4,%a0),%d0
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bclr #31,%d0
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jne .Lx2\@
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printf \bit,"0."
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jra .Lx3\@
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.Lx2\@: printf \bit,"1."
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.Lx3\@: printf \bit,"%08x%08x",2,%d0,%a0@(8)
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move.w (2,%a0),%d0
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ext.l %d0
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printf \bit,"E%04x",1,%d0
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#else
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printf \bit," %08x%08x%08x",3,%a0@,%a0@(4),%a0@(8)
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#endif
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movem.l (%sp)+,%d0/%a0
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#endif
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.endm
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.macro debug instr,args
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#ifdef FPU_EMU_DEBUG
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\instr \args
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#endif
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.endm
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_FRV_MATH_EMU_H */
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