1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_M68K_SETUP_H
3#define _ASM_M68K_SETUP_H
4
5#include <asm/setup.h>
6#include <linux/linkage.h>
7
8/* Status Register bits */
9
10/* accrued exception bits */
11#define FPSR_AEXC_INEX	3
12#define FPSR_AEXC_DZ	4
13#define FPSR_AEXC_UNFL	5
14#define FPSR_AEXC_OVFL	6
15#define FPSR_AEXC_IOP	7
16
17/* exception status bits */
18#define FPSR_EXC_INEX1	8
19#define FPSR_EXC_INEX2	9
20#define FPSR_EXC_DZ	10
21#define FPSR_EXC_UNFL	11
22#define FPSR_EXC_OVFL	12
23#define FPSR_EXC_OPERR	13
24#define FPSR_EXC_SNAN	14
25#define FPSR_EXC_BSUN	15
26
27/* quotient byte, assumes big-endian, of course */
28#define FPSR_QUOTIENT(fpsr) (*((signed char *) &(fpsr) + 1))
29
30/* condition code bits */
31#define FPSR_CC_NAN	24
32#define FPSR_CC_INF	25
33#define FPSR_CC_Z	26
34#define FPSR_CC_NEG	27
35
36
37/* Control register bits */
38
39/* rounding mode */
40#define	FPCR_ROUND_RN	0		/* round to nearest/even */
41#define FPCR_ROUND_RZ	1		/* round to zero */
42#define FPCR_ROUND_RM	2		/* minus infinity */
43#define FPCR_ROUND_RP	3		/* plus infinity */
44
45/* rounding precision */
46#define FPCR_PRECISION_X	0	/* long double */
47#define FPCR_PRECISION_S	1	/* double */
48#define FPCR_PRECISION_D	2	/* float */
49
50
51/* Flags to select the debugging output */
52#define PDECODE		0
53#define PEXECUTE	1
54#define PCONV		2
55#define PNORM		3
56#define PREGISTER	4
57#define PINSTR		5
58#define PUNIMPL		6
59#define PMOVEM		7
60
61#define PMDECODE	(1<<PDECODE)
62#define PMEXECUTE	(1<<PEXECUTE)
63#define PMCONV		(1<<PCONV)
64#define PMNORM		(1<<PNORM)
65#define PMREGISTER	(1<<PREGISTER)
66#define PMINSTR		(1<<PINSTR)
67#define PMUNIMPL	(1<<PUNIMPL)
68#define PMMOVEM		(1<<PMOVEM)
69
70#ifndef __ASSEMBLY__
71
72#include <linux/kernel.h>
73#include <linux/sched.h>
74
75union fp_mant64 {
76	unsigned long long m64;
77	unsigned long m32[2];
78};
79
80union fp_mant128 {
81	unsigned long long m64[2];
82	unsigned long m32[4];
83};
84
85/* internal representation of extended fp numbers */
86struct fp_ext {
87	unsigned char lowmant;
88	unsigned char sign;
89	unsigned short exp;
90	union fp_mant64 mant;
91};
92
93/* C representation of FPU registers */
94/* NOTE: if you change this, you have to change the assembler offsets
95   below and the size in <asm/fpu.h>, too */
96struct fp_data {
97	struct fp_ext fpreg[8];
98	unsigned int fpcr;
99	unsigned int fpsr;
100	unsigned int fpiar;
101	unsigned short prec;
102	unsigned short rnd;
103	struct fp_ext temp[2];
104};
105
106#ifdef FPU_EMU_DEBUG
107extern unsigned int fp_debugprint;
108
109#define dprint(bit, fmt, ...) ({			\
110	if (fp_debugprint & (1 << (bit)))		\
111		pr_info(fmt, ##__VA_ARGS__);		\
112})
113#else
114#define dprint(bit, fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
115#endif
116
117#define uprint(str) ({					\
118	static int __count = 3;				\
119							\
120	if (__count > 0) {				\
121		pr_err("You just hit an unimplemented "	\
122		       "fpu instruction (%s)\n", str);	\
123		pr_err("Please report this to ....\n");	\
124		__count--;				\
125	}						\
126})
127
128#define FPDATA		((struct fp_data *)current->thread.fp)
129
130#else	/* __ASSEMBLY__ */
131
132#define FPDATA		%a2
133
134/* offsets from the base register to the floating point data in the task struct */
135#define FPD_FPREG	(TASK_THREAD+THREAD_FPREG+0)
136#define FPD_FPCR	(TASK_THREAD+THREAD_FPREG+96)
137#define FPD_FPSR	(TASK_THREAD+THREAD_FPREG+100)
138#define FPD_FPIAR	(TASK_THREAD+THREAD_FPREG+104)
139#define FPD_PREC	(TASK_THREAD+THREAD_FPREG+108)
140#define FPD_RND		(TASK_THREAD+THREAD_FPREG+110)
141#define FPD_TEMPFP1	(TASK_THREAD+THREAD_FPREG+112)
142#define FPD_TEMPFP2	(TASK_THREAD+THREAD_FPREG+124)
143#define FPD_SIZEOF	(TASK_THREAD+THREAD_FPREG+136)
144
145/* offsets on the stack to access saved registers,
146 * these are only used during instruction decoding
147 * where we always know how deep we're on the stack.
148 */
149#define FPS_DO		(PT_OFF_D0)
150#define FPS_D1		(PT_OFF_D1)
151#define FPS_D2		(PT_OFF_D2)
152#define FPS_A0		(PT_OFF_A0)
153#define FPS_A1		(PT_OFF_A1)
154#define FPS_A2		(PT_OFF_A2)
155#define FPS_SR		(PT_OFF_SR)
156#define FPS_PC		(PT_OFF_PC)
157#define FPS_EA		(PT_OFF_PC+6)
158#define FPS_PC2		(PT_OFF_PC+10)
159
160.macro	fp_get_fp_reg
161	lea	(FPD_FPREG,FPDATA,%d0.w*4),%a0
162	lea	(%a0,%d0.w*8),%a0
163.endm
164
165/* Macros used to get/put the current program counter.
166 * 020/030 use a different stack frame then 040/060, for the
167 * 040/060 the return pc points already to the next location,
168 * so this only needs to be modified for jump instructions.
169 */
170.macro	fp_get_pc dest
171	move.l	(FPS_PC+4,%sp),\dest
172.endm
173
174.macro	fp_put_pc src,jump=0
175	move.l	\src,(FPS_PC+4,%sp)
176.endm
177
178.macro	fp_get_instr_data	f,s,dest,label
179	getuser	\f,%sp@(FPS_PC+4)@(0),\dest,\label,%sp@(FPS_PC+4)
180	addq.l	#\s,%sp@(FPS_PC+4)
181.endm
182
183.macro	fp_get_instr_word	dest,label,addr
184	fp_get_instr_data	w,2,\dest,\label,\addr
185.endm
186
187.macro	fp_get_instr_long	dest,label,addr
188	fp_get_instr_data	l,4,\dest,\label,\addr
189.endm
190
191/* These macros are used to read from/write to user space
192 * on error we jump to the fixup section, load the fault
193 * address into %a0 and jump to the exit.
194 * (derived from <asm/uaccess.h>)
195 */
196.macro	getuser	size,src,dest,label,addr
197|	printf	,"[\size<%08x]",1,\addr
198.Lu1\@:	moves\size	\src,\dest
199
200	.section .fixup,"ax"
201	.even
202.Lu2\@:	move.l	\addr,%a0
203	jra	\label
204	.previous
205
206	.section __ex_table,"a"
207	.align	4
208	.long	.Lu1\@,.Lu2\@
209	.previous
210.endm
211
212.macro	putuser	size,src,dest,label,addr
213|	printf	,"[\size>%08x]",1,\addr
214.Lu1\@:	moves\size	\src,\dest
215.Lu2\@:
216
217	.section .fixup,"ax"
218	.even
219.Lu3\@:	move.l	\addr,%a0
220	jra	\label
221	.previous
222
223	.section __ex_table,"a"
224	.align	4
225	.long	.Lu1\@,.Lu3\@
226	.long	.Lu2\@,.Lu3\@
227	.previous
228.endm
229
230/* work around binutils idiocy */
231old_gas=-1
232.irp    gas_ident.x .x
233old_gas=old_gas+1
234.endr
235.if !old_gas
236.irp	m b,w,l
237.macro	getuser.\m src,dest,label,addr
238	getuser .\m,\src,\dest,\label,\addr
239.endm
240.macro	putuser.\m src,dest,label,addr
241	putuser .\m,\src,\dest,\label,\addr
242.endm
243.endr
244.endif
245
246.macro	movestack	nr,arg1,arg2,arg3,arg4,arg5
247	.if	\nr
248	movestack	(\nr-1),\arg2,\arg3,\arg4,\arg5
249	move.l	\arg1,-(%sp)
250	.endif
251.endm
252
253.macro	printf	bit=-1,string,nr=0,arg1,arg2,arg3,arg4,arg5
254#ifdef FPU_EMU_DEBUG
255	.data
256.Lpdata\@:
257	.string	"\string"
258	.previous
259
260	movem.l	%d0/%d1/%a0/%a1,-(%sp)
261	.if	\bit+1
262#if 0
263	moveq	#\bit,%d0
264	andw	#7,%d0
265	btst	%d0,fp_debugprint+((31-\bit)/8)
266#else
267	btst	#\bit,fp_debugprint+((31-\bit)/8)
268#endif
269	jeq	.Lpskip\@
270	.endif
271	movestack	\nr,\arg1,\arg2,\arg3,\arg4,\arg5
272	pea	.Lpdata\@
273	jsr	printk
274	lea	((\nr+1)*4,%sp),%sp
275.Lpskip\@:
276	movem.l	(%sp)+,%d0/%d1/%a0/%a1
277#endif
278.endm
279
280.macro	printx	bit,fp
281#ifdef FPU_EMU_DEBUG
282	movem.l	%d0/%a0,-(%sp)
283	lea	\fp,%a0
284#if 0
285	moveq	#'+',%d0
286	tst.w	(%a0)
287	jeq	.Lx1\@
288	moveq	#'-',%d0
289.Lx1\@:	printf	\bit," %c",1,%d0
290	move.l	(4,%a0),%d0
291	bclr	#31,%d0
292	jne	.Lx2\@
293	printf	\bit,"0."
294	jra	.Lx3\@
295.Lx2\@:	printf	\bit,"1."
296.Lx3\@:	printf	\bit,"%08x%08x",2,%d0,%a0@(8)
297	move.w	(2,%a0),%d0
298	ext.l	%d0
299	printf	\bit,"E%04x",1,%d0
300#else
301	printf	\bit," %08x%08x%08x",3,%a0@,%a0@(4),%a0@(8)
302#endif
303	movem.l	(%sp)+,%d0/%a0
304#endif
305.endm
306
307.macro	debug	instr,args
308#ifdef FPU_EMU_DEBUG
309	\instr	\args
310#endif
311.endm
312
313
314#endif	/* __ASSEMBLY__ */
315
316#endif	/* _ASM_M68K_SETUP_H */
317