mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-10-31 14:04:26 -04:00
498 lines
13 KiB
Diff
498 lines
13 KiB
Diff
From 1ba9968246337836bf0acdbf7733a628da5c5e42 Mon Sep 17 00:00:00 2001
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From: Alison Wang <b18965@freescale.com>
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Date: Thu, 4 Aug 2011 09:59:42 +0800
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Subject: [PATCH 12/52] Add vDSO support for Coldfire platform
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This patch adds vDSO support for Coldfire platform.
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Signed-off-by: Alison Wang <b18965@freescale.com>
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---
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arch/m68k/coldfire/common/entry.S | 36 ++++++++++
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arch/m68k/coldfire/vdso/Makefile | 46 +++++++++++++
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arch/m68k/coldfire/vdso/vdso-bin.S | 14 ++++
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arch/m68k/coldfire/vdso/vdso-lib.S | 57 ++++++++++++++++
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arch/m68k/coldfire/vdso/vdso-note.S | 27 ++++++++
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arch/m68k/coldfire/vdso/vdso.c | 124 +++++++++++++++++++++++++++++++++++
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arch/m68k/coldfire/vdso/vdso.lds.S | 89 +++++++++++++++++++++++++
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arch/m68k/include/asm/auxvec.h | 9 +++
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arch/m68k/mm/init.c | 3 +
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9 files changed, 405 insertions(+), 0 deletions(-)
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create mode 100644 arch/m68k/coldfire/vdso/Makefile
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create mode 100644 arch/m68k/coldfire/vdso/vdso-bin.S
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create mode 100644 arch/m68k/coldfire/vdso/vdso-lib.S
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create mode 100644 arch/m68k/coldfire/vdso/vdso-note.S
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create mode 100644 arch/m68k/coldfire/vdso/vdso.c
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create mode 100644 arch/m68k/coldfire/vdso/vdso.lds.S
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--- a/arch/m68k/coldfire/common/entry.S
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+++ b/arch/m68k/coldfire/common/entry.S
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@@ -69,6 +69,9 @@ ENTRY(buserr)
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movew #0x2700,%sr /* lock interrupts */
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#endif
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SAVE_ALL_INT
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+#ifdef CONFIG_VDSO
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+ jsr check_vdso_atomic_cmpxchg_32
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+#endif
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#ifdef CONFIG_COLDFIRE_FOO
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movew PT_0FF_SR(%sp),%d3 /* get original %sr */
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oril #0x2000,%d3 /* set supervisor mode in it */
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@@ -82,6 +85,9 @@ ENTRY(buserr)
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ENTRY(trap)
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SAVE_ALL_INT
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+#ifdef CONFIG_VDSO
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+ jsr check_vdso_atomic_cmpxchg_32
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+#endif
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GET_CURRENT(%d0)
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movel %sp,%sp@- /* stack frame pointer argument */
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jsr trap_c
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@@ -213,6 +219,9 @@ do_delayed_trace:
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*/
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ENTRY(inthandler)
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SAVE_ALL_INT
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+#ifdef CONFIG_VDSO
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+ jsr check_vdso_atomic_cmpxchg_32
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+#endif
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GET_CURRENT(%d0)
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movel %curptr@(TASK_INFO+TINFO_PREEMPT),%d0
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addil #0x10000,%d0
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@@ -398,8 +407,35 @@ resume:
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movew %a1@(TASK_THREAD+THREAD_SR),%d0
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movew %d0,%sr
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+#ifdef CONFIG_VDSO
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+ /* save thread pointer */
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+ lea _vdso_tp,%a0
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+ movel (%a0),%a0
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+ movel %a1@(TASK_INFO+TINFO_TP_VALUE),(%a0)
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+#endif
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rts
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+#ifdef CONFIG_VDSO
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+/* if interrupted PC is between 0x5fffe40c to 0x5ffffe412 */
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+/* then set PC back to 0x5fffe40c (start addr of __kernel_atomic_cmpxchg_32) */
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+/* note: these absolute addresses depend on vdso-lib.S and vdso.lds.S */
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+ENTRY(check_vdso_atomic_cmpxchg_32)
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+ movel %sp@(PT_OFF_PC),%d0
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+ cmpil #0x5fffe414,%d0 /* __kernel_atomic_cmpxchg_32: line 4 */
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+ ble label1
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+ cmpil #0x5fffe412,%d0 /* __kernel_atomic_cmpxchg_32: line 3 */
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+ beql label0
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+ cmpil #0x5fffe40e,%d0 /* __kernel_atomic_cmpxchg_32: line 2 */
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+ beql label0
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+ jra label1
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+label0:
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+ /* __kernel_atomic_cmpxchg_32: line 1 */
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+ movel #0x5fffe40c,%d0
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+ movel %d0,%sp@(PT_OFF_PC)
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+label1:
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+ rts
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+#endif
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+
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.data
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ALIGN
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sys_call_table:
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--- /dev/null
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+++ b/arch/m68k/coldfire/vdso/Makefile
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@@ -0,0 +1,46 @@
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+#
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+# Makefile for arch/m68k/coldfire/vdso with special rules
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+# for building the DSO lib
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+#
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+# Based on arch/sh/kernel/vsyscall/Makefile
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+#
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+# Kurt Mahan <kmahan@freescale.com>
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+#
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+
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+obj-y := vdso.o vdso-bin.o
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+
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+$(obj)/vdso-bin.o: $(obj)/vdso.lds $(obj)/vdso-lib.so
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+
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+#
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+# The DSO Lib
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+#
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+
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+# special linker script for building DSO images
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+quiet_cmd_vdso = VDSO $@
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+ cmd_vdso = $(LD) -nostdlib --eh-frame-hdr $(SYSCFLAGS_$(@F)) \
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+ -T $(obj)/vdso.lds $^ -o $@
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+
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+vdso-flags = -shared -s -soname=linux-gate.so.1
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+
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+SYSCFLAGS_vdso-lib.so = $(vdso-flags)
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+
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+$(obj)/vdso-lib.so: $(obj)/vdso-lib.o $(obj)/vdso-note.o
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+ $(call if_changed,vdso)
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+
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+$(obj)/vdso.lds: $(srctree)/arch/m68k/coldfire/vdso/vdso.lds.S
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+ cp $< $@
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+
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+#
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+# Create a special relocatable object that should mirror the
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+# symbol table and layout of the linked DSO lib. With ld -R
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+# these symbols can be refered to in the kernel code rather
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+# than as hand-coded addresses
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+#
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+# extra-y += vdso-syms.o
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+# $(obj)/built-in.o: $(obj)/vdso-syms.o
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+# $(obj)/built-in.o: ld_flags += -R (obj)/vdso-syms.o
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+
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+# SYSCFLAGS_vdso-syms.o = -r
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+# $(obj)/vdso-syms.o: $(src)/vdso.lds \
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+# $(obj)/vdso-lib.o $(obj)/vdso-note.o FORCE
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+# $(call if_changed,vdso)
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--- /dev/null
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+++ b/arch/m68k/coldfire/vdso/vdso-bin.S
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@@ -0,0 +1,14 @@
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+/*
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+ * Setup vdso lib (.so) as binary image.
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+ */
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+
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+#include <linux/init.h>
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+
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+__INITDATA
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+
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+ .globl vdso_bin_start, vdso_bin_end
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+vdso_bin_start:
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+ .incbin "arch/m68k/coldfire/vdso/vdso-lib.so"
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+vdso_bin_end:
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+
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+__FINIT
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--- /dev/null
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+++ b/arch/m68k/coldfire/vdso/vdso-lib.S
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@@ -0,0 +1,57 @@
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+/*
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+ * VDSO userspace code
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+ *
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+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
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+ * Kurt Mahan <kmahan@freescale.com>
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+ *
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+ * This is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ */
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+
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+#include <linux/linkage.h>
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+#include <asm/unistd.h>
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+
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+ .text
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+/*
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+ * Read the thread pointer into A0 (and D0, for compatibility).
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+ */
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+ENTRY(__kernel_read_tp)
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+ .cfi_startproc
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+ lea kuser_vdso_tp,%a0
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+ movel (%a0), %d0
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+ movel %d0,%a0
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+ rts
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+ .cfi_endproc
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+ .size __kernel_read_tp,.-__kernel_read_tp
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+
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+/*
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+ * Atomic compare exchange. Can not clobber any registers
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+ * other than conditional codes.
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+ */
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+ENTRY(__kernel_atomic_cmpxchg_32)
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+ .cfi_startproc
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+ cmpl (%a0),%d0
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+ bne label0
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+ movel %d1, (%a0)
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+ jmp label1
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+label0:
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+ movel (%a0),%d0
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+label1:
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+ rts
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+ .cfi_endproc
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+ .size __kernel_atomic_cmpxchg_32,.-__kernel_atomic_cmpxchg_32
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+
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+/*
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+ * Atomic memory barrier. Can not clobber any registers
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+ * other than condition codes.
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+ */
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+ENTRY(__kernel_atomic_barrier)
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+ .cfi_startproc
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+ /* no code needed for uniprocs */
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+ rts
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+ .cfi_endproc
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+ .size __kernel_atomic_barrier,.-__kernel_atomic_barrier
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+
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+ .previous
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--- /dev/null
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+++ b/arch/m68k/coldfire/vdso/vdso-note.S
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@@ -0,0 +1,27 @@
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+/*
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+ * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
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+ * Here we can supply some information useful to userland.
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+ *
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+ * Based on arch/sh/kernel/vsyscall/vsyscall-note.S
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+ */
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+
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+#include <linux/uts.h>
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+#include <linux/version.h>
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+
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+#define ASM_ELF_NOTE_BEGIN(name, flags, vendor, type) \
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+ .section name, flags; \
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+ .balign 4; \
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+ .long 1f - 0f; /* name length */ \
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+ .long 3f - 2f; /* data length */ \
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+ .long type; /* note type */ \
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+0: .asciz vendor; /* vendor name */ \
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+1: .balign 4; \
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+2:
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+
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+#define ASM_ELF_NOTE_END \
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+3: .balign 4; /* pad out section */ \
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+ .previous
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+
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+ ASM_ELF_NOTE_BEGIN(".note.kernel-version", "a", UTS_SYSNAME, 0)
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+ .long LINUX_VERSION_CODE
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+ ASM_ELF_NOTE_END
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--- /dev/null
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+++ b/arch/m68k/coldfire/vdso/vdso.c
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@@ -0,0 +1,124 @@
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+/*
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+ * arch/m68k/coldfire/vdso/vdso.c
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+ *
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+ * Based on arch/sh/kernel/vsyscall/vsyscall.c
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+ *
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+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
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+ * Kurt Mahan <kmahan@freescale.com>
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+ *
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+ * This is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ */
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+
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+#include <linux/mm.h>
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+#include <linux/slab.h>
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/gfp.h>
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+#include <linux/module.h>
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+#include <linux/elf.h>
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+#include <linux/sched.h>
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+#include <linux/err.h>
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+
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+/* Mapping vDSO at the default address (what would've been returned
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+ * if VDSO_MBASE was 0) makes it impossible to extend data segment
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+ * (through brk()) for static binaries. The vDSO fits into one page,
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+ * so map it just before TASK_UNMAPPED_BASE.
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+ */
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+#define VDSO_MBASE (TASK_UNMAPPED_BASE - PAGE_SIZE)
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+#define VDSO_VAR_OFFSET 4096
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+
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+unsigned int vdso_enabled = 1;
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+EXPORT_SYMBOL_GPL(vdso_enabled);
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+
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+static struct page *vdso_pages[1];
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+
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+/* _vdso_var_start: vdso_page_start + offset_4K */
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+/* it's used to save key values from kernel */
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+void *_vdso_var_start;
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+void *_vdso_tp;
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+
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+extern const char vdso_bin_start, vdso_bin_end;
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+
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+int __init vdso_init(void)
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+{
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+ void *vdso_page = (void *)get_zeroed_page(GFP_ATOMIC);
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+ vdso_pages[0] = virt_to_page(vdso_page);
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+
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+ _vdso_var_start = (void *)(vdso_page + VDSO_VAR_OFFSET);
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+ _vdso_tp = _vdso_var_start;
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+
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+ printk(KERN_INFO "** VDSO_INIT\n");
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+
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+ /* copy dso bin in */
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+ memcpy(vdso_page,
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+ &vdso_bin_start, &vdso_bin_end - &vdso_bin_start);
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+
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+ return 0;
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+}
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+
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+/* setup VMA at program startup for the vdso page */
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+int arch_setup_additional_pages(struct linux_binprm *bprm,
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+ int executable_stack)
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+{
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+ struct mm_struct *mm = current->mm;
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+ unsigned long addr;
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+ int ret;
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+
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+ current->mm->context.vdso = 0;
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+
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+ down_write(&mm->mmap_sem);
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+ addr = get_unmapped_area(NULL, VDSO_MBASE, PAGE_SIZE, 0, 0);
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+ if (IS_ERR_VALUE(addr)) {
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+ ret = addr;
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+ goto up_fail;
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+ }
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+
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+ ret = install_special_mapping(mm, addr, PAGE_SIZE,
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+ VM_READ | VM_EXEC |
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+ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |
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+ VM_ALWAYSDUMP,
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+ vdso_pages);
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+
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+ if (unlikely(ret))
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+ goto up_fail;
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+
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+ current->mm->context.vdso = (void *)addr;
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+
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+up_fail:
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+#ifdef DEBUG
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+ printk(KERN_DEBUG "arch_setup_additional_pages: addr: %lx; ret: %d\n",
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+ addr, ret);
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+#endif
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+
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+ up_write(&mm->mmap_sem);
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+ return ret;
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+}
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+
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+/*
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+ * check vma name
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+ */
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+const char *arch_vma_name(struct vm_area_struct *vma)
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+{
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+ if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
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+ return "[vdso]";
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+
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+ return NULL;
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+}
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+
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+struct vm_area_struct *get_gate_vma(struct task_struct *task)
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+{
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+ return NULL;
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+}
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+
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+int in_gate_area(struct task_struct *task, unsigned long address)
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+{
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+ return 0;
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+}
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+
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+int in_gate_area_no_task(unsigned long address)
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+{
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+ return 0;
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+}
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--- /dev/null
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+++ b/arch/m68k/coldfire/vdso/vdso.lds.S
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@@ -0,0 +1,89 @@
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+/*
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+ * Linker script for vdso DSO. The vdso page is an ELF shared
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+ * object prelinked to its virtual address, and with only one read-only
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+ * segment (that fits in one page). This script controls its layout.
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+ *
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+ * Based on arch/sh/kernel/vsyscall/vsyscall.lds.S
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+ *
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+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
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+ * Kurt Mahan <kmahan@freescale.com>
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+ *
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+ * This is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ */
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+
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+OUTPUT_FORMAT("elf32-m68k", "elf32-m68k", "elf32-m68k")
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+OUTPUT_ARCH(m68k)
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+
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+/* The ELF entry point can be used to set the AT_SYSINFO value. */
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+ENTRY(__kernel_read_tp);
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+ENTRY(__kernel_atomic_cmpxchg_32);
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+ENTRY(__kernel_atomic_barrier);
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+
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+SECTIONS
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+{
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+ . = 0x5fffe000 + SIZEOF_HEADERS;
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+
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+ .hash : { *(.hash) } :text
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+ .gnu.hash : { *(.gnu.hash) }
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+ .dynsym : { *(.dynsym) }
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+ .dynstr : { *(.dynstr) }
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+ .gnu.version : { *(.gnu.version) }
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+ .gnu.version_d : { *(.gnu.version_d) }
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+ .gnu.version_r : { *(.gnu.version_r) }
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+
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+ /*
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+ * This linker script is used both with -r and with -shared.
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+ * For the layouts to match, we need to skip more than enough
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+ * space for the dynamic symbol table et al. If this amount
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+ * is insufficient, ld -shared will barf. Just increase it here.
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+ */
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+ . = 0x5fffe000 + 0x400;
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+
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+ .text : { *(.text) } :text
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+ .note : { *(.note.*) } :text :note
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+ .eh_frame_hdr : { *(.eh_frame_hdr ) } :text :eh_frame_hdr
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+ .eh_frame : {
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+ KEEP (*(.eh_frame))
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+ LONG (0)
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+ } :text
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+ .dynamic : { *(.dynamic) } :text :dynamic
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+ .useless : {
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+ *(.got.plt) *(.got)
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+ *(.data .data.* .gnu.linkonce.d.*)
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+ *(.dynbss)
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+ *(.bss .bss.* .gnu.linkonce.b.*)
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+ } :text
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+
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+ . = 0x5fffe000 + 0x1000;
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+ kuser_vdso_tp = .;
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+}
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+
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+/*
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+ * We must supply the ELF program headers explicitly to get just one
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+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
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+ */
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+PHDRS
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+{
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+ text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
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+ dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
|
|
+ note PT_NOTE FLAGS(4); /* PF_R */
|
|
+ eh_frame_hdr PT_GNU_EH_FRAME;
|
|
+}
|
|
+
|
|
+/*
|
|
+ * This controls what symbols we export from the DSO.
|
|
+ */
|
|
+VERSION
|
|
+{
|
|
+ LINUX_2.6 {
|
|
+ global:
|
|
+ __kernel_read_tp;
|
|
+ __kernel_atomic_cmpxchg_32;
|
|
+ __kernel_atomic_barrier;
|
|
+
|
|
+ local: *;
|
|
+ };
|
|
+}
|
|
--- a/arch/m68k/include/asm/auxvec.h
|
|
+++ b/arch/m68k/include/asm/auxvec.h
|
|
@@ -1,4 +1,13 @@
|
|
#ifndef __ASMm68k_AUXVEC_H
|
|
#define __ASMm68k_AUXVEC_H
|
|
+/*
|
|
+ * Architecture-neutral AT_ values in 0-17, leave some room
|
|
+ * for more of them.
|
|
+ */
|
|
+
|
|
+#ifdef CONFIG_VDSO
|
|
+/* Entry point to the vdso page */
|
|
+#define AT_SYSINFO_EHDR 33
|
|
+#endif
|
|
|
|
#endif
|
|
--- a/arch/m68k/mm/init.c
|
|
+++ b/arch/m68k/mm/init.c
|
|
@@ -39,6 +39,9 @@
|
|
#include <asm/sections.h>
|
|
#include <asm/tlb.h>
|
|
|
|
+#ifdef CONFIG_VDSO
|
|
+int vdso_init(void);
|
|
+#endif
|
|
|
|
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
|
|
|