projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| a17ae4c3 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| b020632e MS |
2 | /* |
| 3 | * Userland implementation of gettimeofday() for 32 bits processes in a | |
| 4 | * s390 kernel for use in the vDSO | |
| 5 | * | |
| 6 | * Copyright IBM Corp. 2008 | |
| 7 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) | |
| b020632e | 8 | */ |
| b020632e MS |
9 | #include <asm/vdso.h> |
| 10 | #include <asm/asm-offsets.h> | |
| 11 | #include <asm/unistd.h> | |
| 12 | ||
| 13 | .text | |
| 14 | .align 4 | |
| 15 | .globl __kernel_gettimeofday | |
| 16 | .type __kernel_gettimeofday,@function | |
| 17 | __kernel_gettimeofday: | |
| 18 | .cfi_startproc | |
| 9b2efe03 | 19 | ahi %r15,-16 |
| b020632e MS |
20 | basr %r5,0 |
| 21 | 0: al %r5,13f-0b(%r5) /* get &_vdso_data */ | |
| 22 | 1: ltr %r3,%r3 /* check if tz is NULL */ | |
| 23 | je 2f | |
| 24 | mvc 0(8,%r3),__VDSO_TIMEZONE(%r5) | |
| 25 | 2: ltr %r2,%r2 /* check if tv is NULL */ | |
| 26 | je 10f | |
| 27 | l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */ | |
| 28 | tml %r4,0x0001 /* pending update ? loop */ | |
| 29 | jnz 1b | |
| 9b2efe03 | 30 | stcke 0(%r15) /* Store TOD clock */ |
| 75c7b6f3 MS |
31 | lm %r0,%r1,__VDSO_TS_END(%r5) /* TOD steering end time */ |
| 32 | s %r0,1(%r15) | |
| 33 | sl %r1,5(%r15) | |
| 34 | brc 3,14f | |
| 35 | ahi %r0,-1 | |
| 36 | 14: ltr %r0,%r0 /* past end of steering? */ | |
| 37 | jm 16f | |
| 38 | srdl %r0,15 /* 1 per 2^16 */ | |
| 39 | tm __VDSO_TS_DIR+3(%r5),0x01 /* steering direction? */ | |
| 40 | jz 15f | |
| 41 | lcr %r0,%r0 /* negative TOD offset */ | |
| 42 | lcr %r1,%r1 | |
| 43 | je 15f | |
| 44 | ahi %r0,-1 | |
| 45 | 15: a %r0,1(%r15) /* add TOD timestamp */ | |
| 46 | al %r1,5(%r15) | |
| 47 | brc 12,17f | |
| 48 | ahi %r0,1 | |
| 49 | j 17f | |
| 50 | 16: lm %r0,%r1,1(%r15) /* load TOD timestamp */ | |
| 51 | 17: s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */ | |
| b020632e MS |
52 | sl %r1,__VDSO_XTIME_STAMP+4(%r5) |
| 53 | brc 3,3f | |
| 54 | ahi %r0,-1 | |
| 79c74ecb | 55 | 3: ms %r0,__VDSO_TK_MULT(%r5) /* * tk->mult */ |
| 9b2efe03 | 56 | st %r0,0(%r15) |
| 79c74ecb | 57 | l %r0,__VDSO_TK_MULT(%r5) |
| b020632e MS |
58 | ltr %r1,%r1 |
| 59 | mr %r0,%r0 | |
| 60 | jnm 4f | |
| 79c74ecb | 61 | a %r0,__VDSO_TK_MULT(%r5) |
| 9b2efe03 | 62 | 4: al %r0,0(%r15) |
| b020632e MS |
63 | al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */ |
| 64 | al %r1,__VDSO_XTIME_NSEC+4(%r5) | |
| 65 | brc 12,5f | |
| 66 | ahi %r0,1 | |
| 9b2efe03 | 67 | 5: mvc 0(4,%r15),__VDSO_XTIME_SEC+4(%r5) |
| b020632e MS |
68 | cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */ |
| 69 | jne 1b | |
| 79c74ecb MS |
70 | l %r4,__VDSO_TK_SHIFT(%r5) /* Timekeeper shift */ |
| 71 | srdl %r0,0(%r4) /* >> tk->shift */ | |
| 9b2efe03 | 72 | l %r4,0(%r15) /* get tv_sec from stack */ |
| b020632e MS |
73 | basr %r5,0 |
| 74 | 6: ltr %r0,%r0 | |
| 75 | jnz 7f | |
| 76 | cl %r1,11f-6b(%r5) | |
| 77 | jl 8f | |
| 78 | 7: ahi %r4,1 | |
| 79 | sl %r1,11f-6b(%r5) | |
| 80 | brc 3,6b | |
| 81 | ahi %r0,-1 | |
| 82 | j 6b | |
| 83 | 8: st %r4,0(%r2) /* store tv->tv_sec */ | |
| 84 | ltr %r1,%r1 | |
| 85 | m %r0,12f-6b(%r5) | |
| 86 | jnm 9f | |
| 87 | al %r0,12f-6b(%r5) | |
| 88 | 9: srl %r0,6 | |
| 89 | st %r0,4(%r2) /* store tv->tv_usec */ | |
| 90 | 10: slr %r2,%r2 | |
| 9b2efe03 | 91 | ahi %r15,16 |
| b020632e MS |
92 | br %r14 |
| 93 | 11: .long 1000000000 | |
| 94 | 12: .long 274877907 | |
| 95 | 13: .long _vdso_data - 0b | |
| 96 | .cfi_endproc | |
| 97 | .size __kernel_gettimeofday,.-__kernel_gettimeofday |