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Commit 28dfbe6e authored by Andrew Waterman's avatar Andrew Waterman Committed by Palmer Dabbelt
Browse files

RISC-V: Add VDSO entries for clock_get/gettimeofday/getcpu 



For now these are just placeholders that execute the syscall.  We will
later optimize them to avoid kernel crossings, but we'd like to have the
VDSO entries from the first released kernel version to make the ABI
simpler.

Signed-off-by: default avatarAndrew Waterman <andrew@sifive.com>
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
parent b7e5a591

arch/riscv/kernel/vdso/Makefile

+5 −1
Original line number Diff line number Diff line
@@ -2,6 +2,10 @@ 


# Symbols present in the vdso

vdso-syms  = rt_sigreturn

vdso-syms += gettimeofday

vdso-syms += clock_gettime

vdso-syms += clock_getres

vdso-syms += getcpu



# Files to link into the vdso

obj-vdso = $(patsubst %, %.o, $(vdso-syms))

arch/riscv/kernel/vdso/clock_getres.S

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 SiFive

 *

 *   This program is free software; you can redistribute it and/or

 *   modify it under the terms of the GNU General Public License

 *   as published by the Free Software Foundation, version 2.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 */



#include <linux/linkage.h>

#include <asm/unistd.h>



	.text

/* int __vdso_clock_getres(clockid_t clock_id, struct timespec *res); */

ENTRY(__vdso_clock_getres)

	.cfi_startproc

	/* For now, just do the syscall. */

	li a7, __NR_clock_getres

	ecall

	ret

	.cfi_endproc

ENDPROC(__vdso_clock_getres)

arch/riscv/kernel/vdso/clock_gettime.S

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 SiFive

 *

 *   This program is free software; you can redistribute it and/or

 *   modify it under the terms of the GNU General Public License

 *   as published by the Free Software Foundation, version 2.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 */



#include <linux/linkage.h>

#include <asm/unistd.h>



	.text

/* int __vdso_clock_gettime(clockid_t clock_id, struct timespec *tp); */

ENTRY(__vdso_clock_gettime)

	.cfi_startproc

	/* For now, just do the syscall. */

	li a7, __NR_clock_gettime

	ecall

	ret

	.cfi_endproc

ENDPROC(__vdso_clock_gettime)

arch/riscv/kernel/vdso/getcpu.S

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 SiFive

 *

 *   This program is free software; you can redistribute it and/or

 *   modify it under the terms of the GNU General Public License

 *   as published by the Free Software Foundation, version 2.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 */



#include <linux/linkage.h>

#include <asm/unistd.h>



	.text

/* int __vdso_getcpu(unsigned *cpu, unsigned *node, void *unused); */

ENTRY(__vdso_getcpu)

	.cfi_startproc

	/* For now, just do the syscall. */

	li a7, __NR_getcpu

	ecall

	ret

	.cfi_endproc

ENDPROC(__vdso_getcpu)

arch/riscv/kernel/vdso/gettimeofday.S

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 SiFive

 *

 *   This program is free software; you can redistribute it and/or

 *   modify it under the terms of the GNU General Public License

 *   as published by the Free Software Foundation, version 2.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 */



#include <linux/linkage.h>

#include <asm/unistd.h>



	.text

/* int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz); */

ENTRY(__vdso_gettimeofday)

	.cfi_startproc

	/* For now, just do the syscall. */

	li a7, __NR_gettimeofday

	ecall

	ret

	.cfi_endproc

ENDPROC(__vdso_gettimeofday)