180 lines
4.3 KiB
ArmAsm
180 lines
4.3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Userland implementation of clock_gettime() 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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#include <asm/dwarf.h>
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#include <asm/ptrace.h>
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.text
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.align 4
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.globl __kernel_clock_gettime
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.type __kernel_clock_gettime,@function
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__kernel_clock_gettime:
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CFI_STARTPROC
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ahi %r15,-16
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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basr %r5,0
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0: al %r5,21f-0b(%r5) /* get &_vdso_data */
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chi %r2,__CLOCK_REALTIME_COARSE
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je 10f
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chi %r2,__CLOCK_REALTIME
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je 11f
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chi %r2,__CLOCK_MONOTONIC_COARSE
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je 9f
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chi %r2,__CLOCK_MONOTONIC
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jne 19f
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/* CLOCK_MONOTONIC */
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1: 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,%r1,1(%r15)
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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 3,2f
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ahi %r0,-1
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2: ms %r0,__VDSO_TK_MULT(%r5) /* * tk->mult */
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lr %r2,%r0
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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 3f
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a %r0,__VDSO_TK_MULT(%r5)
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3: alr %r0,%r2
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al %r0,__VDSO_WTOM_NSEC(%r5)
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al %r1,__VDSO_WTOM_NSEC+4(%r5)
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brc 12,5f
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ahi %r0,1
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5: l %r2,__VDSO_TK_SHIFT(%r5) /* Timekeeper shift */
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srdl %r0,0(%r2) /* >> tk->shift */
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l %r2,__VDSO_WTOM_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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basr %r5,0
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6: ltr %r0,%r0
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jnz 7f
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cl %r1,20f-6b(%r5)
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jl 8f
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7: ahi %r2,1
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sl %r1,20f-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 %r2,0(%r3) /* store tp->tv_sec */
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st %r1,4(%r3) /* store tp->tv_nsec */
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lhi %r2,0
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ahi %r15,16
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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/* CLOCK_MONOTONIC_COARSE */
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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9: 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 9b
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l %r2,__VDSO_WTOM_CRS_SEC+4(%r5)
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l %r1,__VDSO_WTOM_CRS_NSEC+4(%r5)
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cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
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jne 9b
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j 8b
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/* CLOCK_REALTIME_COARSE */
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10: 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 10b
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l %r2,__VDSO_XTIME_CRS_SEC+4(%r5)
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l %r1,__VDSO_XTIME_CRS_NSEC+4(%r5)
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cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
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jne 10b
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j 17f
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/* CLOCK_REALTIME */
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11: 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 11b
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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) /* no - ts_steering_end */
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sl %r1,5(%r15)
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brc 3,22f
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ahi %r0,-1
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22: ltr %r0,%r0 /* past end of steering? */
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jm 24f
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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 23f
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lcr %r0,%r0 /* negative TOD offset */
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lcr %r1,%r1
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je 23f
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ahi %r0,-1
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23: a %r0,1(%r15) /* add TOD timestamp */
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al %r1,5(%r15)
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brc 12,25f
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ahi %r0,1
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j 25f
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24: lm %r0,%r1,1(%r15) /* load TOD timestamp */
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25: 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 3,12f
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ahi %r0,-1
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12: ms %r0,__VDSO_TK_MULT(%r5) /* * tk->mult */
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lr %r2,%r0
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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 13f
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a %r0,__VDSO_TK_MULT(%r5)
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13: alr %r0,%r2
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al %r0,__VDSO_XTIME_NSEC(%r5) /* + tk->xtime_nsec */
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al %r1,__VDSO_XTIME_NSEC+4(%r5)
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brc 12,14f
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ahi %r0,1
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14: l %r2,__VDSO_TK_SHIFT(%r5) /* Timekeeper shift */
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srdl %r0,0(%r2) /* >> tk->shift */
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l %r2,__VDSO_XTIME_SEC+4(%r5)
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cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
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jne 11b
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basr %r5,0
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15: ltr %r0,%r0
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jnz 16f
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cl %r1,20f-15b(%r5)
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jl 17f
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16: ahi %r2,1
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sl %r1,20f-15b(%r5)
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brc 3,15b
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ahi %r0,-1
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j 15b
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17: st %r2,0(%r3) /* store tp->tv_sec */
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st %r1,4(%r3) /* store tp->tv_nsec */
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lhi %r2,0
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ahi %r15,16
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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/* Fallback to system call */
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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19: lhi %r1,__NR_clock_gettime
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svc 0
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ahi %r15,16
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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CFI_ENDPROC
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20: .long 1000000000
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21: .long _vdso_data - 0b
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.size __kernel_clock_gettime,.-__kernel_clock_gettime
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