xref: /openbmc/linux/arch/sparc/kernel/etrap_64.S (revision d8bcaabe) 
1/*
2 * etrap.S: Preparing for entry into the kernel on Sparc V9.
3 *
4 * Copyright (C) 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz)
6 */
7
8
9#include <asm/asi.h>
10#include <asm/pstate.h>
11#include <asm/ptrace.h>
12#include <asm/page.h>
13#include <asm/spitfire.h>
14#include <asm/head.h>
15#include <asm/processor.h>
16#include <asm/mmu.h>
17
18#define		TASK_REGOFF		(THREAD_SIZE-TRACEREG_SZ-STACKFRAME_SZ)
19#define		ETRAP_PSTATE1		(PSTATE_TSO | PSTATE_PRIV)
20#define		ETRAP_PSTATE2		\
21		(PSTATE_TSO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE)
22
23/*
24 * On entry, %g7 is return address - 0x4.
25 * %g4 and %g5 will be preserved %l4 and %l5 respectively.
26 */
27
28		.text
29		.align	64
30		.globl	etrap_syscall, etrap, etrap_irq, etraptl1
31etrap:		rdpr	%pil, %g2
32etrap_irq:	clr	%g3
33etrap_syscall:	TRAP_LOAD_THREAD_REG(%g6, %g1)
34		rdpr	%tstate, %g1
35		or	%g1, %g3, %g1
36		sllx	%g2, 20, %g3
37		andcc	%g1, TSTATE_PRIV, %g0
38		or	%g1, %g3, %g1
39		bne,pn	%xcc, 1f
40		 sub	%sp, STACKFRAME_SZ+TRACEREG_SZ-STACK_BIAS, %g2
41661:		wrpr	%g0, 7, %cleanwin
42		.section .fast_win_ctrl_1insn_patch, "ax"
43		.word	661b
44		.word	0x85880000	! allclean
45		.previous
46
47		sethi	%hi(TASK_REGOFF), %g2
48		sethi	%hi(TSTATE_PEF), %g3
49		or	%g2, %lo(TASK_REGOFF), %g2
50		and	%g1, %g3, %g3
51		brnz,pn	%g3, 1f
52		 add	%g6, %g2, %g2
53		wr	%g0, 0, %fprs
541:		rdpr	%tpc, %g3
55
56		stx	%g1, [%g2 + STACKFRAME_SZ + PT_V9_TSTATE]
57		rdpr	%tnpc, %g1
58		stx	%g3, [%g2 + STACKFRAME_SZ + PT_V9_TPC]
59		rd	%y, %g3
60		stx	%g1, [%g2 + STACKFRAME_SZ + PT_V9_TNPC]
61		rdpr	%tt, %g1
62		st	%g3, [%g2 + STACKFRAME_SZ + PT_V9_Y]
63		sethi	%hi(PT_REGS_MAGIC), %g3
64		or	%g3, %g1, %g1
65		st	%g1, [%g2 + STACKFRAME_SZ + PT_V9_MAGIC]
66
67		rdpr	%cansave, %g1
68		brnz,pt %g1, etrap_save
69		 nop
70
71		rdpr	%cwp, %g1
72		add	%g1, 2, %g1
73		wrpr	%g1, %cwp
74		be,pt	%xcc, etrap_user_spill
75		 mov	ASI_AIUP, %g3
76
77		rdpr	%otherwin, %g3
78		brz	%g3, etrap_kernel_spill
79		 mov	ASI_AIUS, %g3
80
81etrap_user_spill:
82
83		wr	%g3, 0x0, %asi
84		ldx	[%g6 + TI_FLAGS], %g3
85		and	%g3, _TIF_32BIT, %g3
86		brnz,pt	%g3, etrap_user_spill_32bit
87		 nop
88		ba,a,pt	%xcc, etrap_user_spill_64bit
89
90etrap_save:	save	%g2, -STACK_BIAS, %sp
91		mov	%g6, %l6
92
93		bne,pn	%xcc, 3f
94		 mov	PRIMARY_CONTEXT, %l4
95661:		rdpr	%canrestore, %g3
96		.section .fast_win_ctrl_1insn_patch, "ax"
97		.word	661b
98		nop
99		.previous
100
101		rdpr	%wstate, %g2
102661:		wrpr	%g0, 0, %canrestore
103		.section .fast_win_ctrl_1insn_patch, "ax"
104		.word	661b
105		nop
106		.previous
107		sll	%g2, 3, %g2
108
109		/* Set TI_SYS_FPDEPTH to 1 and clear TI_SYS_NOERROR.  */
110		mov	1, %l5
111		sth	%l5, [%l6 + TI_SYS_NOERROR]
112
113661:		wrpr	%g3, 0, %otherwin
114		.section .fast_win_ctrl_1insn_patch, "ax"
115		.word	661b
116		.word	0x87880000	! otherw
117		.previous
118
119		wrpr	%g2, 0, %wstate
120		sethi	%hi(sparc64_kern_pri_context), %g2
121		ldx	[%g2 + %lo(sparc64_kern_pri_context)], %g3
122
123661:		stxa	%g3, [%l4] ASI_DMMU
124		.section .sun4v_1insn_patch, "ax"
125		.word	661b
126		stxa	%g3, [%l4] ASI_MMU
127		.previous
128
129		sethi	%hi(KERNBASE), %l4
130		flush	%l4
131		mov	ASI_AIUS, %l7
1322:		mov	%g4, %l4
133		mov	%g5, %l5
134		add	%g7, 4, %l2
135
136		/* Go to trap time globals so we can save them.  */
137661:		wrpr	%g0, ETRAP_PSTATE1, %pstate
138		.section .sun4v_1insn_patch, "ax"
139		.word	661b
140		SET_GL(0)
141		.previous
142
143		stx	%g1, [%sp + PTREGS_OFF + PT_V9_G1]
144		stx	%g2, [%sp + PTREGS_OFF + PT_V9_G2]
145		sllx	%l7, 24, %l7
146		stx	%g3, [%sp + PTREGS_OFF + PT_V9_G3]
147		rdpr	%cwp, %l0
148		stx	%g4, [%sp + PTREGS_OFF + PT_V9_G4]
149		stx	%g5, [%sp + PTREGS_OFF + PT_V9_G5]
150		stx	%g6, [%sp + PTREGS_OFF + PT_V9_G6]
151		stx	%g7, [%sp + PTREGS_OFF + PT_V9_G7]
152		or	%l7, %l0, %l7
153		sethi	%hi(TSTATE_TSO | TSTATE_PEF), %l0
154		or	%l7, %l0, %l7
155		wrpr	%l2, %tnpc
156		wrpr	%l7, (TSTATE_PRIV | TSTATE_IE), %tstate
157		stx	%i0, [%sp + PTREGS_OFF + PT_V9_I0]
158		stx	%i1, [%sp + PTREGS_OFF + PT_V9_I1]
159		stx	%i2, [%sp + PTREGS_OFF + PT_V9_I2]
160		stx	%i3, [%sp + PTREGS_OFF + PT_V9_I3]
161		stx	%i4, [%sp + PTREGS_OFF + PT_V9_I4]
162		stx	%i5, [%sp + PTREGS_OFF + PT_V9_I5]
163		stx	%i6, [%sp + PTREGS_OFF + PT_V9_I6]
164		mov	%l6, %g6
165		stx	%i7, [%sp + PTREGS_OFF + PT_V9_I7]
166		LOAD_PER_CPU_BASE(%g5, %g6, %g4, %g3, %l1)
167		ldx	[%g6 + TI_TASK], %g4
168		done
169
1703:		mov	ASI_P, %l7
171		ldub	[%l6 + TI_FPDEPTH], %l5
172		add	%l6, TI_FPSAVED + 1, %l4
173		srl	%l5, 1, %l3
174		add	%l5, 2, %l5
175
176		/* Set TI_SYS_FPDEPTH to %l5 and clear TI_SYS_NOERROR.  */
177		sth	%l5, [%l6 + TI_SYS_NOERROR]
178		ba,pt	%xcc, 2b
179		 stb	%g0, [%l4 + %l3]
180		nop
181
182etraptl1:	/* Save tstate/tpc/tnpc of TL 1-->4 and the tl register itself.
183		 * We place this right after pt_regs on the trap stack.
184		 * The layout is:
185		 *	0x00	TL1's TSTATE
186		 *	0x08	TL1's TPC
187		 *	0x10	TL1's TNPC
188		 *	0x18	TL1's TT
189		 *	 ...
190		 *	0x58	TL4's TT
191		 *	0x60	TL
192		 */
193		TRAP_LOAD_THREAD_REG(%g6, %g1)
194		sub	%sp, ((4 * 8) * 4) + 8, %g2
195		rdpr	%tl, %g1
196
197		wrpr	%g0, 1, %tl
198		rdpr	%tstate, %g3
199		stx	%g3, [%g2 + STACK_BIAS + 0x00]
200		rdpr	%tpc, %g3
201		stx	%g3, [%g2 + STACK_BIAS + 0x08]
202		rdpr	%tnpc, %g3
203		stx	%g3, [%g2 + STACK_BIAS + 0x10]
204		rdpr	%tt, %g3
205		stx	%g3, [%g2 + STACK_BIAS + 0x18]
206
207		wrpr	%g0, 2, %tl
208		rdpr	%tstate, %g3
209		stx	%g3, [%g2 + STACK_BIAS + 0x20]
210		rdpr	%tpc, %g3
211		stx	%g3, [%g2 + STACK_BIAS + 0x28]
212		rdpr	%tnpc, %g3
213		stx	%g3, [%g2 + STACK_BIAS + 0x30]
214		rdpr	%tt, %g3
215		stx	%g3, [%g2 + STACK_BIAS + 0x38]
216
217		sethi	%hi(is_sun4v), %g3
218		lduw	[%g3 + %lo(is_sun4v)], %g3
219		brnz,pn	%g3, finish_tl1_capture
220		 nop
221
222		wrpr	%g0, 3, %tl
223		rdpr	%tstate, %g3
224		stx	%g3, [%g2 + STACK_BIAS + 0x40]
225		rdpr	%tpc, %g3
226		stx	%g3, [%g2 + STACK_BIAS + 0x48]
227		rdpr	%tnpc, %g3
228		stx	%g3, [%g2 + STACK_BIAS + 0x50]
229		rdpr	%tt, %g3
230		stx	%g3, [%g2 + STACK_BIAS + 0x58]
231
232		wrpr	%g0, 4, %tl
233		rdpr	%tstate, %g3
234		stx	%g3, [%g2 + STACK_BIAS + 0x60]
235		rdpr	%tpc, %g3
236		stx	%g3, [%g2 + STACK_BIAS + 0x68]
237		rdpr	%tnpc, %g3
238		stx	%g3, [%g2 + STACK_BIAS + 0x70]
239		rdpr	%tt, %g3
240		stx	%g3, [%g2 + STACK_BIAS + 0x78]
241
242		stx	%g1, [%g2 + STACK_BIAS + 0x80]
243
244finish_tl1_capture:
245		wrpr	%g0, 1, %tl
246661:		nop
247		.section .sun4v_1insn_patch, "ax"
248		.word	661b
249		SET_GL(1)
250		.previous
251
252		rdpr	%tstate, %g1
253		sub	%g2, STACKFRAME_SZ + TRACEREG_SZ - STACK_BIAS, %g2
254		ba,pt	%xcc, 1b
255		 andcc	%g1, TSTATE_PRIV, %g0
256
257#undef TASK_REGOFF
258#undef ETRAP_PSTATE1
259