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| /* SPDX-License-Identifier: GPL-2.0 */
| /*
| * Userland implementation of gettimeofday() for 32 bits processes in a
| * s390 kernel for use in the vDSO
| *
| * Copyright IBM Corp. 2008
| * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
| */
| #include <asm/vdso.h>
| #include <asm/asm-offsets.h>
| #include <asm/unistd.h>
| #include <asm/dwarf.h>
| #include <asm/ptrace.h>
|
| .text
| .align 4
| .globl __kernel_gettimeofday
| .type __kernel_gettimeofday,@function
| __kernel_gettimeofday:
| CFI_STARTPROC
| ahi %r15,-16
| CFI_ADJUST_CFA_OFFSET 16
| CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
| basr %r5,0
| 0: al %r5,13f-0b(%r5) /* get &_vdso_data */
| 1: ltr %r3,%r3 /* check if tz is NULL */
| je 2f
| mvc 0(8,%r3),__VDSO_TIMEZONE(%r5)
| 2: ltr %r2,%r2 /* check if tv is NULL */
| je 10f
| l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
| tml %r4,0x0001 /* pending update ? loop */
| jnz 1b
| stcke 0(%r15) /* Store TOD clock */
| lm %r0,%r1,__VDSO_TS_END(%r5) /* TOD steering end time */
| s %r0,1(%r15)
| sl %r1,5(%r15)
| brc 3,14f
| ahi %r0,-1
| 14: ltr %r0,%r0 /* past end of steering? */
| jm 16f
| srdl %r0,15 /* 1 per 2^16 */
| tm __VDSO_TS_DIR+3(%r5),0x01 /* steering direction? */
| jz 15f
| lcr %r0,%r0 /* negative TOD offset */
| lcr %r1,%r1
| je 15f
| ahi %r0,-1
| 15: a %r0,1(%r15) /* add TOD timestamp */
| al %r1,5(%r15)
| brc 12,17f
| ahi %r0,1
| j 17f
| 16: lm %r0,%r1,1(%r15) /* load TOD timestamp */
| 17: s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
| sl %r1,__VDSO_XTIME_STAMP+4(%r5)
| brc 3,3f
| ahi %r0,-1
| 3: ms %r0,__VDSO_TK_MULT(%r5) /* * tk->mult */
| st %r0,0(%r15)
| l %r0,__VDSO_TK_MULT(%r5)
| ltr %r1,%r1
| mr %r0,%r0
| jnm 4f
| a %r0,__VDSO_TK_MULT(%r5)
| 4: al %r0,0(%r15)
| al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */
| al %r1,__VDSO_XTIME_NSEC+4(%r5)
| brc 12,5f
| ahi %r0,1
| 5: mvc 0(4,%r15),__VDSO_XTIME_SEC+4(%r5)
| cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
| jne 1b
| l %r4,__VDSO_TK_SHIFT(%r5) /* Timekeeper shift */
| srdl %r0,0(%r4) /* >> tk->shift */
| l %r4,0(%r15) /* get tv_sec from stack */
| basr %r5,0
| 6: ltr %r0,%r0
| jnz 7f
| cl %r1,11f-6b(%r5)
| jl 8f
| 7: ahi %r4,1
| sl %r1,11f-6b(%r5)
| brc 3,6b
| ahi %r0,-1
| j 6b
| 8: st %r4,0(%r2) /* store tv->tv_sec */
| ltr %r1,%r1
| m %r0,12f-6b(%r5)
| jnm 9f
| al %r0,12f-6b(%r5)
| 9: srl %r0,6
| st %r0,4(%r2) /* store tv->tv_usec */
| 10: slr %r2,%r2
| ahi %r15,16
| CFI_ADJUST_CFA_OFFSET -16
| CFI_RESTORE 15
| br %r14
| CFI_ENDPROC
| 11: .long 1000000000
| 12: .long 274877907
| 13: .long _vdso_data - 0b
| .size __kernel_gettimeofday,.-__kernel_gettimeofday
|
|
