53634237e7
Now that the SPDX tag is in all arch/s390/kernel/ files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
98 lines
2.3 KiB
ArmAsm
98 lines
2.3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Userland implementation of gettimeofday() for 32 bits processes in a
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* s390 kernel for use in the vDSO
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*
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* Copyright IBM Corp. 2008
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#include <asm/vdso.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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.text
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.align 4
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.globl __kernel_gettimeofday
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.type __kernel_gettimeofday,@function
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__kernel_gettimeofday:
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.cfi_startproc
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ahi %r15,-16
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basr %r5,0
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0: al %r5,13f-0b(%r5) /* get &_vdso_data */
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1: ltr %r3,%r3 /* check if tz is NULL */
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je 2f
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mvc 0(8,%r3),__VDSO_TIMEZONE(%r5)
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2: ltr %r2,%r2 /* check if tv is NULL */
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je 10f
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l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
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tml %r4,0x0001 /* pending update ? loop */
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jnz 1b
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stcke 0(%r15) /* Store TOD clock */
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lm %r0,%r1,__VDSO_TS_END(%r5) /* TOD steering end time */
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s %r0,1(%r15)
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sl %r1,5(%r15)
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brc 3,14f
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ahi %r0,-1
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14: ltr %r0,%r0 /* past end of steering? */
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jm 16f
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srdl %r0,15 /* 1 per 2^16 */
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tm __VDSO_TS_DIR+3(%r5),0x01 /* steering direction? */
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jz 15f
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lcr %r0,%r0 /* negative TOD offset */
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lcr %r1,%r1
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je 15f
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ahi %r0,-1
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15: a %r0,1(%r15) /* add TOD timestamp */
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al %r1,5(%r15)
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brc 12,17f
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ahi %r0,1
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j 17f
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16: lm %r0,%r1,1(%r15) /* load TOD timestamp */
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17: s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
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sl %r1,__VDSO_XTIME_STAMP+4(%r5)
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brc 3,3f
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ahi %r0,-1
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3: ms %r0,__VDSO_TK_MULT(%r5) /* * tk->mult */
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st %r0,0(%r15)
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l %r0,__VDSO_TK_MULT(%r5)
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ltr %r1,%r1
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mr %r0,%r0
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jnm 4f
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a %r0,__VDSO_TK_MULT(%r5)
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4: al %r0,0(%r15)
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al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */
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al %r1,__VDSO_XTIME_NSEC+4(%r5)
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brc 12,5f
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ahi %r0,1
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5: mvc 0(4,%r15),__VDSO_XTIME_SEC+4(%r5)
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cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
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jne 1b
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l %r4,__VDSO_TK_SHIFT(%r5) /* Timekeeper shift */
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srdl %r0,0(%r4) /* >> tk->shift */
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l %r4,0(%r15) /* get tv_sec from stack */
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basr %r5,0
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6: ltr %r0,%r0
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jnz 7f
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cl %r1,11f-6b(%r5)
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jl 8f
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7: ahi %r4,1
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sl %r1,11f-6b(%r5)
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brc 3,6b
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ahi %r0,-1
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j 6b
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8: st %r4,0(%r2) /* store tv->tv_sec */
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ltr %r1,%r1
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m %r0,12f-6b(%r5)
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jnm 9f
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al %r0,12f-6b(%r5)
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9: srl %r0,6
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st %r0,4(%r2) /* store tv->tv_usec */
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10: slr %r2,%r2
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ahi %r15,16
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br %r14
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11: .long 1000000000
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12: .long 274877907
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13: .long _vdso_data - 0b
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.cfi_endproc
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.size __kernel_gettimeofday,.-__kernel_gettimeofday
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