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powerpc/vdso: augment VDSO32 functions to support 64 bits build

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VDSO64 cacheflush.S datapage.S gettimeofday.S and vgettimeofday.c
are very similar to their VDSO32 counterpart.

VDSO32 counterpart is already more complete than the VDSO64 version
as it supports both PPC32 vdso and 32 bits VDSO for PPC64.

Use compat macros wherever necessary in PPC32 files
so that they can also be used to build VDSO64.

vdso64/note.S is already a link to vdso32/note.S so
no change is required.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c2cbb8f046b7efc251053521dc39b752795e26b7.1642782130.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-01-21 16:30:21 +00:00 committed by Michael Ellerman
parent 6836f09903
commit f061fb03ee
6 changed files with 41 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/asm-compat.h
View File

@ -21,6 +21,7 @@
#define PPC_STLCX stringify_in_c(stdcx.)
#define PPC_CNTLZL stringify_in_c(cntlzd)
#define PPC_MTOCRF(FXM, RS) MTOCRF((FXM), RS)
#define PPC_SRL stringify_in_c(srd)
#define PPC_LR_STKOFF 16
#define PPC_MIN_STKFRM 112
@ -54,6 +55,7 @@
#define PPC_STLCX stringify_in_c(stwcx.)
#define PPC_CNTLZL stringify_in_c(cntlzw)
#define PPC_MTOCRF stringify_in_c(mtcrf)
#define PPC_SRL stringify_in_c(srw)
#define PPC_LR_STKOFF 4
#define PPC_MIN_STKFRM 16

4
arch/powerpc/kernel/vdso32/cacheflush.S
View File

@ -46,7 +46,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
add r8,r8,r5 /* ensure we get enough */
#ifdef CONFIG_PPC64
lwz r9,CFG_DCACHE_LOGBLOCKSZ(r10)
srw. r8,r8,r9 /* compute line count */
PPC_SRL. r8,r8,r9 /* compute line count */
#else
srwi. r8, r8, L1_CACHE_SHIFT
mr r7, r6
@ -72,7 +72,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
subf r8,r6,r4 /* compute length */
add r8,r8,r5
lwz r9,CFG_ICACHE_LOGBLOCKSZ(r10)
srw. r8,r8,r9 /* compute line count */
PPC_SRL. r8,r8,r9 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
#endif

10
arch/powerpc/kernel/vdso32/datapage.S
View File

@ -30,11 +30,15 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map)
mr. r4,r3
get_datapage r3
mtlr r12
#ifdef __powerpc64__
addi r3,r3,CFG_SYSCALL_MAP64
#else
addi r3,r3,CFG_SYSCALL_MAP32
#endif
crclr cr0*4+so
beqlr
li r0,NR_syscalls
stw r0,0(r4)
crclr cr0*4+so
blr
.cfi_endproc
V_FUNCTION_END(__kernel_get_syscall_map)
@ -49,8 +53,10 @@ V_FUNCTION_BEGIN(__kernel_get_tbfreq)
mflr r12
.cfi_register lr,r12
get_datapage r3
#ifndef __powerpc64__
lwz r4,(CFG_TB_TICKS_PER_SEC + 4)(r3)
lwz r3,CFG_TB_TICKS_PER_SEC(r3)
#endif
PPC_LL r3,CFG_TB_TICKS_PER_SEC(r3)
mtlr r12
crclr cr0*4+so
blr

4
arch/powerpc/kernel/vdso32/getcpu.S
View File

@ -19,8 +19,8 @@
V_FUNCTION_BEGIN(__kernel_getcpu)
.cfi_startproc
mfspr r5,SPRN_SPRG_VDSO_READ
cmpwi cr0,r3,0
cmpwi cr1,r4,0
PPC_LCMPI cr0,r3,0
PPC_LCMPI cr1,r4,0
clrlwi r6,r5,16
rlwinm r7,r5,16,31-15,31-0
beq cr0,1f

8
arch/powerpc/kernel/vdso32/gettimeofday.S
View File

@ -1,7 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Userland implementation of gettimeofday() for 32 bits processes in a
* ppc64 kernel for use in the vDSO
* Userland implementation of gettimeofday() for processes
* for use in the vDSO
*
* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org,
* IBM Corp.
@ -41,9 +41,11 @@ V_FUNCTION_END(__kernel_clock_gettime)
* int __kernel_clock_gettime64(clockid_t clock_id, struct __timespec64 *ts);
*
*/
#ifndef __powerpc64__
V_FUNCTION_BEGIN(__kernel_clock_gettime64)
cvdso_call __c_kernel_clock_gettime64
V_FUNCTION_END(__kernel_clock_gettime64)
#endif
/*
* Exact prototype of clock_getres()
@ -69,6 +71,7 @@ V_FUNCTION_END(__kernel_time)
/* Routines for restoring integer registers, called by the compiler. */
/* Called with r11 pointing to the stack header word of the caller of the */
/* function, just beyond the end of the integer restore area. */
#ifndef __powerpc64__
_GLOBAL(_restgpr_31_x)
_GLOBAL(_rest32gpr_31_x)
lwz r0,4(r11)
@ -76,3 +79,4 @@ _GLOBAL(_rest32gpr_31_x)
mtlr r0
mr r1,r11
blr
#endif

27
arch/powerpc/kernel/vdso32/vgettimeofday.c
View File

@ -2,8 +2,22 @@
/*
* Powerpc userspace implementations of gettimeofday() and similar.
*/
#include <linux/time.h>
#include <linux/types.h>
#ifdef __powerpc64__
int __c_kernel_clock_gettime(clockid_t clock, struct __kernel_timespec *ts,
const struct vdso_data *vd)
{
return __cvdso_clock_gettime_data(vd, clock, ts);
}
int __c_kernel_clock_getres(clockid_t clock_id, struct __kernel_timespec *res,
const struct vdso_data *vd)
{
return __cvdso_clock_getres_data(vd, clock_id, res);
}
#else
int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts,
const struct vdso_data *vd)
{
@ -16,18 +30,19 @@ int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts,
return __cvdso_clock_gettime_data(vd, clock, ts);
}
int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res,
const struct vdso_data *vd)
{
return __cvdso_clock_getres_time32_data(vd, clock_id, res);
}
#endif
int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz,
const struct vdso_data *vd)
{
return __cvdso_gettimeofday_data(vd, tv, tz);
}
int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res,
const struct vdso_data *vd)
{
return __cvdso_clock_getres_time32_data(vd, clock_id, res);
}
__kernel_old_time_t __c_kernel_time(__kernel_old_time_t *time, const struct vdso_data *vd)
{
return __cvdso_time_data(vd, time);