mips: Add support for generic vDSO

The mips vDSO library requires some adaptations to take advantage of the
newly introduced generic vDSO library.

Introduce the following changes:
 - Modification of vdso.c to be compliant with the common vdso datapage
 - Use of lib/vdso for gettimeofday

Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
[paul.burton@mips.com: Prepend $(src) to config-n32-o32-env.c path.]
Signed-off-by: Paul Burton <paul.burton@mips.com>

1 files changed, 0 insertions, 85 deletions

diff --git a/arch/mips/vdso/vdso.h b/arch/mips/vdso/vdso.h
deleted file mode 100644
index 14b1931be69c..000000000000
--- a/arch/mips/vdso/vdso.h
+++ /dev/null
@@ -1,85 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Copyright (C) 2015 Imagination Technologies
- * Author: Alex Smith <alex.smith@imgtec.com>
- */
-
-#include <asm/sgidefs.h>
-
-#if _MIPS_SIM != _MIPS_SIM_ABI64 && defined(CONFIG_64BIT)
-
-/* Building 32-bit VDSO for the 64-bit kernel. Fake a 32-bit Kconfig. */
-#undef CONFIG_64BIT
-#define CONFIG_32BIT 1
-#ifndef __ASSEMBLY__
-#include <asm-generic/atomic64.h>
-#endif
-#endif
-
-#ifndef __ASSEMBLY__
-
-#include <asm/asm.h>
-#include <asm/page.h>
-#include <asm/vdso.h>
-
-static inline unsigned long get_vdso_base(void)
-{
-	unsigned long addr;
-
-	/*
-	 * We can't use cpu_has_mips_r6 since it needs the cpu_data[]
-	 * kernel symbol.
-	 */
-#ifdef CONFIG_CPU_MIPSR6
-	/*
-	 * lapc <symbol> is an alias to addiupc reg, <symbol> - .
-	 *
-	 * We can't use addiupc because there is no label-label
-	 * support for the addiupc reloc
-	 */
-	__asm__("lapc	%0, _start			\n"
-		: "=r" (addr) : :);
-#else
-	/*
-	 * Get the base load address of the VDSO. We have to avoid generating
-	 * relocations and references to the GOT because ld.so does not peform
-	 * relocations on the VDSO. We use the current offset from the VDSO base
-	 * and perform a PC-relative branch which gives the absolute address in
-	 * ra, and take the difference. The assembler chokes on
-	 * "li %0, _start - .", so embed the offset as a word and branch over
-	 * it.
-	 *
-	 */
-
-	__asm__(
-	"	.set push				\n"
-	"	.set noreorder				\n"
-	"	bal	1f				\n"
-	"	 nop					\n"
-	"	.word	_start - .			\n"
-	"1:	lw	%0, 0($31)			\n"
-	"	" STR(PTR_ADDU) " %0, $31, %0		\n"
-	"	.set pop				\n"
-	: "=r" (addr)
-	:
-	: "$31");
-#endif /* CONFIG_CPU_MIPSR6 */
-
-	return addr;
-}
-
-static inline const union mips_vdso_data *get_vdso_data(void)
-{
-	return (const union mips_vdso_data *)(get_vdso_base() - PAGE_SIZE);
-}
-
-#ifdef CONFIG_CLKSRC_MIPS_GIC
-
-static inline void __iomem *get_gic(const union mips_vdso_data *data)
-{
-	return (void __iomem *)data - PAGE_SIZE;
-}
-
-#endif /* CONFIG_CLKSRC_MIPS_GIC */
-
-#endif /* __ASSEMBLY__ */