diff options
Diffstat (limited to 'arch/s390/kernel/vdso32')
| -rw-r--r-- | arch/s390/kernel/vdso32/Makefile | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso32/getcpu.S | 43 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso32/vdso32.lds.S | 1 |
3 files changed, 45 insertions, 1 deletions
diff --git a/arch/s390/kernel/vdso32/Makefile b/arch/s390/kernel/vdso32/Makefile index ee8a18e50..f9c459586 100644 --- a/arch/s390/kernel/vdso32/Makefile +++ b/arch/s390/kernel/vdso32/Makefile @@ -1,6 +1,6 @@ # List of files in the vdso, has to be asm only for now -obj-vdso32 = gettimeofday.o clock_getres.o clock_gettime.o note.o +obj-vdso32 = gettimeofday.o clock_getres.o clock_gettime.o note.o getcpu.o # Build rules diff --git a/arch/s390/kernel/vdso32/getcpu.S b/arch/s390/kernel/vdso32/getcpu.S new file mode 100644 index 000000000..c1ed0b720 --- /dev/null +++ b/arch/s390/kernel/vdso32/getcpu.S @@ -0,0 +1,43 @@ +/* + * Userland implementation of getcpu() for 32 bits processes in a + * s390 kernel for use in the vDSO + * + * Copyright IBM Corp. 2016 + * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> + */ +#include <asm/vdso.h> +#include <asm/asm-offsets.h> + + .text + .align 4 + .globl __kernel_getcpu + .type __kernel_getcpu,@function +__kernel_getcpu: + .cfi_startproc + ear %r1,%a4 + lhi %r4,1 + sll %r4,24 + sar %a4,%r4 + la %r4,0 + epsw %r0,0 + sacf 512 + l %r5,__VDSO_CPU_NR(%r4) + l %r4,__VDSO_NODE_ID(%r4) + tml %r0,0x4000 + jo 1f + tml %r0,0x8000 + jno 0f + sacf 256 + j 1f +0: sacf 0 +1: sar %a4,%r1 + ltr %r2,%r2 + jz 2f + st %r5,0(%r2) +2: ltr %r3,%r3 + jz 3f + st %r4,0(%r3) +3: lhi %r2,0 + br %r14 + .cfi_endproc + .size __kernel_getcpu,.-__kernel_getcpu diff --git a/arch/s390/kernel/vdso32/vdso32.lds.S b/arch/s390/kernel/vdso32/vdso32.lds.S index a8c379fa1..8f048c2d6 100644 --- a/arch/s390/kernel/vdso32/vdso32.lds.S +++ b/arch/s390/kernel/vdso32/vdso32.lds.S @@ -132,6 +132,7 @@ VERSION __kernel_gettimeofday; __kernel_clock_gettime; __kernel_clock_getres; + __kernel_getcpu; local: *; }; |