1/*	$NetBSD: reg.h,v 1.14 2021/08/13 20:47:55 andvar Exp $	*/
 2
 3#ifndef _POWERPC_REG_H_
 4#define _POWERPC_REG_H_
 5
 6/*
 7 *  Register Usage according the SVR4 ABI for PPC.
 8 *
 9 *  Register	Usage
10 *  r0		Volatile register which may be modified during function linkage
11 *  r1		Stack frame pointer, always valid
12 *  r2		System-reserved register
13 *  r3-r4	Volatile registers used for parameter passing and return values
14 *  r5-r10	Volatile registers used for parameter passing
15 *  r11-r12	Volatile register which may be modified during function linkage
16 *  r13		Small data area pointer register
17 *  f0		Volatile register
18 *  f1		Volatile registers used for parameter passing and return values
19 *  f2-f8	Volatile registers used for parameter passing
20 *  f9-f13	Volatile registers
21 *
22 *  [Start of callee-saved registers]
23 *  r14-r30	Registers used for local variables
24 *  r31		Used for local variable or "environment pointers"
25 *  f14-f31	Registers used for local variables
26 *
27 *
28 *  Register Usage according the ELF64 ABI (PowerOpen/AIX) for PPC.
29 *
30 *  Register	Usage
31 *  r0		Volatile register which may be modified during function linkage
32 *  r1		Stack frame pointer, always valid
33 *  r2		TOC pointer
34 *  r3		Volatile register used for parameter passing and return value
35 *  r4-r10	Volatile registers used for parameter passing
36 *  r11		Volatile register used in calls by pointer and as an
37 *		environment pointer for languages which require one
38 *  r12		Volatile register used for exception handling and glink code
39 *  r13		Reserved for use as system thread ID
40 *
41 *  f0		Volatile register
42 *  f1-f4	Volatile registers used for parameter passing and return values
43 *  f5-f13	Volatile registers used for parameter passing
44
45 *  [Start of callee-saved registers]
46 *  r14-r31	Registers used for local variables
47 *  f14-f31	Registers used for local variables
48 *
49 */
50
51struct reg {				/* base registers */
52	__register_t fixreg[32];
53	__register_t lr;			/* Link Register */
54	int cr;				/* Condition Register */
55	int xer;			/* SPR 1 */
56	__register_t ctr;			/* Count Register */
57	__register_t pc;			/* Program Counter */
58};
59
60struct fpreg {				/* Floating Point registers */
61#ifdef _KERNEL
62	uint64_t fpreg[32];
63	uint64_t fpscr;			/* Status and Control Register */
64#else
65	double fpreg[32];
66	double fpscr;			/* Status and Control Register */
67#endif
68};
69
70struct vreg {				/* Vector registers */
71	uint32_t vreg[32][4];
72	__register_t vrsave;		/* SPR 256 */
73	__register_t spare[2];		/* filler */
74	__register_t vscr;		/* Vector Status And Control Register */
75};
76
77#endif /* _POWERPC_REG_H_ */