1/* SPDX-License-Identifier: GPL-2.0 */
 2
 3/*
 4 * Preserved registers that are shared between code in ivt.S and
 5 * entry.S.  Be careful not to step on these!
 6 */
 7#define PRED_LEAVE_SYSCALL	1 /* TRUE iff leave from syscall */
 8#define PRED_KERNEL_STACK	2 /* returning to kernel-stacks? */
 9#define PRED_USER_STACK		3 /* returning to user-stacks? */
10#define PRED_SYSCALL		4 /* inside a system call? */
11#define PRED_NON_SYSCALL	5 /* complement of PRED_SYSCALL */
12
13#ifdef __ASSEMBLY__
14# define PASTE2(x,y)	x##y
15# define PASTE(x,y)	PASTE2(x,y)
16
17# define pLvSys		PASTE(p,PRED_LEAVE_SYSCALL)
18# define pKStk		PASTE(p,PRED_KERNEL_STACK)
19# define pUStk		PASTE(p,PRED_USER_STACK)
20# define pSys		PASTE(p,PRED_SYSCALL)
21# define pNonSys	PASTE(p,PRED_NON_SYSCALL)
22#endif
23
24#define PT(f)		(IA64_PT_REGS_##f##_OFFSET)
25#define SW(f)		(IA64_SWITCH_STACK_##f##_OFFSET)
26#define SOS(f)		(IA64_SAL_OS_STATE_##f##_OFFSET)
27
28#define PT_REGS_SAVES(off)			\
29	.unwabi 3, 'i';				\
30	.fframe IA64_PT_REGS_SIZE+16+(off);	\
31	.spillsp rp, PT(CR_IIP)+16+(off);	\
32	.spillsp ar.pfs, PT(CR_IFS)+16+(off);	\
33	.spillsp ar.unat, PT(AR_UNAT)+16+(off);	\
34	.spillsp ar.fpsr, PT(AR_FPSR)+16+(off);	\
35	.spillsp pr, PT(PR)+16+(off);
36
37#define PT_REGS_UNWIND_INFO(off)		\
38	.prologue;				\
39	PT_REGS_SAVES(off);			\
40	.body
41
42#define SWITCH_STACK_SAVES(off)							\
43	.savesp ar.unat,SW(CALLER_UNAT)+16+(off);				\
44	.savesp ar.fpsr,SW(AR_FPSR)+16+(off);					\
45	.spillsp f2,SW(F2)+16+(off); .spillsp f3,SW(F3)+16+(off);		\
46	.spillsp f4,SW(F4)+16+(off); .spillsp f5,SW(F5)+16+(off);		\
47	.spillsp f16,SW(F16)+16+(off); .spillsp f17,SW(F17)+16+(off);		\
48	.spillsp f18,SW(F18)+16+(off); .spillsp f19,SW(F19)+16+(off);		\
49	.spillsp f20,SW(F20)+16+(off); .spillsp f21,SW(F21)+16+(off);		\
50	.spillsp f22,SW(F22)+16+(off); .spillsp f23,SW(F23)+16+(off);		\
51	.spillsp f24,SW(F24)+16+(off); .spillsp f25,SW(F25)+16+(off);		\
52	.spillsp f26,SW(F26)+16+(off); .spillsp f27,SW(F27)+16+(off);		\
53	.spillsp f28,SW(F28)+16+(off); .spillsp f29,SW(F29)+16+(off);		\
54	.spillsp f30,SW(F30)+16+(off); .spillsp f31,SW(F31)+16+(off);		\
55	.spillsp r4,SW(R4)+16+(off); .spillsp r5,SW(R5)+16+(off);		\
56	.spillsp r6,SW(R6)+16+(off); .spillsp r7,SW(R7)+16+(off);		\
57	.spillsp b0,SW(B0)+16+(off); .spillsp b1,SW(B1)+16+(off);		\
58	.spillsp b2,SW(B2)+16+(off); .spillsp b3,SW(B3)+16+(off);		\
59	.spillsp b4,SW(B4)+16+(off); .spillsp b5,SW(B5)+16+(off);		\
60	.spillsp ar.pfs,SW(AR_PFS)+16+(off); .spillsp ar.lc,SW(AR_LC)+16+(off);	\
61	.spillsp @priunat,SW(AR_UNAT)+16+(off);					\
62	.spillsp ar.rnat,SW(AR_RNAT)+16+(off);					\
63	.spillsp ar.bspstore,SW(AR_BSPSTORE)+16+(off);				\
64	.spillsp pr,SW(PR)+16+(off)
65
66#define DO_SAVE_SWITCH_STACK			\
67	movl r28=1f;				\
68	;;					\
69	.fframe IA64_SWITCH_STACK_SIZE;		\
70	adds sp=-IA64_SWITCH_STACK_SIZE,sp;	\
71	mov.ret.sptk b7=r28,1f;			\
72	SWITCH_STACK_SAVES(0);			\
73	br.cond.sptk.many save_switch_stack;	\
741:
75
76#define DO_LOAD_SWITCH_STACK			\
77	movl r28=1f;				\
78	;;					\
79	invala;					\
80	mov.ret.sptk b7=r28,1f;			\
81	br.cond.sptk.many load_switch_stack;	\
821:	.restore sp;				\
83	adds sp=IA64_SWITCH_STACK_SIZE,sp