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gerrit-public.fairphone.software / kernel / msm-4.9 / cd3b70f5d4d82f85d1e1d6e822f38ae098cf7c72 / . / arch / s390 / kvm / sie64a.S
blob: 31646bd0e469a6db61f2386de29a2da0bb2b0e0f [file] [log] [blame]
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]1/*
2 * sie64a.S - low level sie call
3 *
Carsten Ottecd3b70f2010-05-17 10:00:04 +0200[diff] [blame^]4 * Copyright IBM Corp. 2008,2010
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
Carsten Ottecd3b70f2010-05-17 10:00:04 +0200[diff] [blame^]11 * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]12 */
13
14#include <linux/errno.h>
15#include <asm/asm-offsets.h>
Carsten Ottecd3b70f2010-05-17 10:00:04 +0200[diff] [blame^]16#include <asm/setup.h>
17#include <asm/asm-offsets.h>
18#include <asm/ptrace.h>
19#include <asm/thread_info.h>
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]20
Carsten Ottecd3b70f2010-05-17 10:00:04 +0200[diff] [blame^]21_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
22
23/*
24 * offsets into stackframe
25 * SP_ = offsets into stack sie64 is called with
26 * SPI_ = offsets into irq stack
27 */
28SP_GREGS = __SF_EMPTY
29SP_HOOK = __SF_EMPTY+8
30SP_GPP = __SF_EMPTY+16
31SPI_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
32
33
34 .macro SPP newpp
35#ifdef CONFIG_KVM_AWARE_CMF
36 tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP
37 jz 0f
38 .insn s,0xb2800000,\newpp
39 0:
40#endif
41 .endm
42
43sie_irq_handler:
44 SPP __LC_CMF_HPP # set host id
45 larl %r2,sie_inst
46 clg %r2,SPI_PSW+8(0,%r15) # intercepted sie
47 jne 1f
48 xc __LC_SIE_HOOK(8),__LC_SIE_HOOK
49 lg %r2,__LC_THREAD_INFO # pointer thread_info struct
50 tm __TI_flags+7(%r2),_TIF_EXIT_SIE
51 jz 0f
52 larl %r2,sie_exit # work pending, leave sie
53 stg %r2,__LC_RETURN_PSW+8
54 br %r14
550: larl %r2,sie_reenter # re-enter with guest id
56 stg %r2,__LC_RETURN_PSW+8
571: br %r14
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]58
59/*
60 * sie64a calling convention:
61 * %r2 pointer to sie control block
62 * %r3 guest register save area
63 */
64 .globl sie64a
65sie64a:
Carsten Ottecd3b70f2010-05-17 10:00:04 +0200[diff] [blame^]66 stg %r3,SP_GREGS(%r15) # save guest register save area
67 stmg %r6,%r14,__SF_GPRS(%r15) # save registers on entry
68 lgr %r14,%r2 # pointer to sie control block
69 larl %r5,sie_irq_handler
70 stg %r2,SP_GPP(%r15)
71 stg %r5,SP_HOOK(%r15) # save hook target
72 lmg %r0,%r13,0(%r3) # load guest gprs 0-13
73sie_reenter:
74 mvc __LC_SIE_HOOK(8),SP_HOOK(%r15)
75 SPP SP_GPP(%r15) # set guest id
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]76sie_inst:
77 sie 0(%r14)
Carsten Ottecd3b70f2010-05-17 10:00:04 +0200[diff] [blame^]78 xc __LC_SIE_HOOK(8),__LC_SIE_HOOK
79 SPP __LC_CMF_HPP # set host id
80sie_exit:
81 lg %r14,SP_GREGS(%r15)
82 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]83 lghi %r2,0
Carsten Ottecd3b70f2010-05-17 10:00:04 +0200[diff] [blame^]84 lmg %r6,%r14,__SF_GPRS(%r15)
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]85 br %r14
86
87sie_err:
Carsten Ottecd3b70f2010-05-17 10:00:04 +0200[diff] [blame^]88 xc __LC_SIE_HOOK(8),__LC_SIE_HOOK
89 SPP __LC_CMF_HPP # set host id
90 lg %r14,SP_GREGS(%r15)
91 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]92 lghi %r2,-EFAULT
Carsten Ottecd3b70f2010-05-17 10:00:04 +0200[diff] [blame^]93 lmg %r6,%r14,__SF_GPRS(%r15)
Heiko Carstensb0c632d2008-03-25 18:47:20 +0100[diff] [blame]94 br %r14
95
96 .section __ex_table,"a"
97 .quad sie_inst,sie_err
98 .previous