mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-14 12:40:16 +02:00
7e7649baa9
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31546 3c298f89-4303-0410-b956-a3cf2f4a3e73
498 lines
13 KiB
Diff
498 lines
13 KiB
Diff
From 1ba9968246337836bf0acdbf7733a628da5c5e42 Mon Sep 17 00:00:00 2001
|
|
From: Alison Wang <b18965@freescale.com>
|
|
Date: Thu, 4 Aug 2011 09:59:42 +0800
|
|
Subject: [PATCH 12/52] Add vDSO support for Coldfire platform
|
|
|
|
This patch adds vDSO support for Coldfire platform.
|
|
|
|
Signed-off-by: Alison Wang <b18965@freescale.com>
|
|
---
|
|
arch/m68k/coldfire/common/entry.S | 36 ++++++++++
|
|
arch/m68k/coldfire/vdso/Makefile | 46 +++++++++++++
|
|
arch/m68k/coldfire/vdso/vdso-bin.S | 14 ++++
|
|
arch/m68k/coldfire/vdso/vdso-lib.S | 57 ++++++++++++++++
|
|
arch/m68k/coldfire/vdso/vdso-note.S | 27 ++++++++
|
|
arch/m68k/coldfire/vdso/vdso.c | 124 +++++++++++++++++++++++++++++++++++
|
|
arch/m68k/coldfire/vdso/vdso.lds.S | 89 +++++++++++++++++++++++++
|
|
arch/m68k/include/asm/auxvec.h | 9 +++
|
|
arch/m68k/mm/init.c | 3 +
|
|
9 files changed, 405 insertions(+), 0 deletions(-)
|
|
create mode 100644 arch/m68k/coldfire/vdso/Makefile
|
|
create mode 100644 arch/m68k/coldfire/vdso/vdso-bin.S
|
|
create mode 100644 arch/m68k/coldfire/vdso/vdso-lib.S
|
|
create mode 100644 arch/m68k/coldfire/vdso/vdso-note.S
|
|
create mode 100644 arch/m68k/coldfire/vdso/vdso.c
|
|
create mode 100644 arch/m68k/coldfire/vdso/vdso.lds.S
|
|
|
|
--- a/arch/m68k/coldfire/common/entry.S
|
|
+++ b/arch/m68k/coldfire/common/entry.S
|
|
@@ -69,6 +69,9 @@ ENTRY(buserr)
|
|
movew #0x2700,%sr /* lock interrupts */
|
|
#endif
|
|
SAVE_ALL_INT
|
|
+#ifdef CONFIG_VDSO
|
|
+ jsr check_vdso_atomic_cmpxchg_32
|
|
+#endif
|
|
#ifdef CONFIG_COLDFIRE_FOO
|
|
movew PT_0FF_SR(%sp),%d3 /* get original %sr */
|
|
oril #0x2000,%d3 /* set supervisor mode in it */
|
|
@@ -82,6 +85,9 @@ ENTRY(buserr)
|
|
|
|
ENTRY(trap)
|
|
SAVE_ALL_INT
|
|
+#ifdef CONFIG_VDSO
|
|
+ jsr check_vdso_atomic_cmpxchg_32
|
|
+#endif
|
|
GET_CURRENT(%d0)
|
|
movel %sp,%sp@- /* stack frame pointer argument */
|
|
jsr trap_c
|
|
@@ -213,6 +219,9 @@ do_delayed_trace:
|
|
*/
|
|
ENTRY(inthandler)
|
|
SAVE_ALL_INT
|
|
+#ifdef CONFIG_VDSO
|
|
+ jsr check_vdso_atomic_cmpxchg_32
|
|
+#endif
|
|
GET_CURRENT(%d0)
|
|
movel %curptr@(TASK_INFO+TINFO_PREEMPT),%d0
|
|
addil #0x10000,%d0
|
|
@@ -398,8 +407,35 @@ resume:
|
|
movew %a1@(TASK_THREAD+THREAD_SR),%d0
|
|
movew %d0,%sr
|
|
|
|
+#ifdef CONFIG_VDSO
|
|
+ /* save thread pointer */
|
|
+ lea _vdso_tp,%a0
|
|
+ movel (%a0),%a0
|
|
+ movel %a1@(TASK_INFO+TINFO_TP_VALUE),(%a0)
|
|
+#endif
|
|
rts
|
|
|
|
+#ifdef CONFIG_VDSO
|
|
+/* if interrupted PC is between 0x5fffe40c to 0x5ffffe412 */
|
|
+/* then set PC back to 0x5fffe40c (start addr of __kernel_atomic_cmpxchg_32) */
|
|
+/* note: these absolute addresses depend on vdso-lib.S and vdso.lds.S */
|
|
+ENTRY(check_vdso_atomic_cmpxchg_32)
|
|
+ movel %sp@(PT_OFF_PC),%d0
|
|
+ cmpil #0x5fffe414,%d0 /* __kernel_atomic_cmpxchg_32: line 4 */
|
|
+ ble label1
|
|
+ cmpil #0x5fffe412,%d0 /* __kernel_atomic_cmpxchg_32: line 3 */
|
|
+ beql label0
|
|
+ cmpil #0x5fffe40e,%d0 /* __kernel_atomic_cmpxchg_32: line 2 */
|
|
+ beql label0
|
|
+ jra label1
|
|
+label0:
|
|
+ /* __kernel_atomic_cmpxchg_32: line 1 */
|
|
+ movel #0x5fffe40c,%d0
|
|
+ movel %d0,%sp@(PT_OFF_PC)
|
|
+label1:
|
|
+ rts
|
|
+#endif
|
|
+
|
|
.data
|
|
ALIGN
|
|
sys_call_table:
|
|
--- /dev/null
|
|
+++ b/arch/m68k/coldfire/vdso/Makefile
|
|
@@ -0,0 +1,46 @@
|
|
+#
|
|
+# Makefile for arch/m68k/coldfire/vdso with special rules
|
|
+# for building the DSO lib
|
|
+#
|
|
+# Based on arch/sh/kernel/vsyscall/Makefile
|
|
+#
|
|
+# Kurt Mahan <kmahan@freescale.com>
|
|
+#
|
|
+
|
|
+obj-y := vdso.o vdso-bin.o
|
|
+
|
|
+$(obj)/vdso-bin.o: $(obj)/vdso.lds $(obj)/vdso-lib.so
|
|
+
|
|
+#
|
|
+# The DSO Lib
|
|
+#
|
|
+
|
|
+# special linker script for building DSO images
|
|
+quiet_cmd_vdso = VDSO $@
|
|
+ cmd_vdso = $(LD) -nostdlib --eh-frame-hdr $(SYSCFLAGS_$(@F)) \
|
|
+ -T $(obj)/vdso.lds $^ -o $@
|
|
+
|
|
+vdso-flags = -shared -s -soname=linux-gate.so.1
|
|
+
|
|
+SYSCFLAGS_vdso-lib.so = $(vdso-flags)
|
|
+
|
|
+$(obj)/vdso-lib.so: $(obj)/vdso-lib.o $(obj)/vdso-note.o
|
|
+ $(call if_changed,vdso)
|
|
+
|
|
+$(obj)/vdso.lds: $(srctree)/arch/m68k/coldfire/vdso/vdso.lds.S
|
|
+ cp $< $@
|
|
+
|
|
+#
|
|
+# Create a special relocatable object that should mirror the
|
|
+# symbol table and layout of the linked DSO lib. With ld -R
|
|
+# these symbols can be refered to in the kernel code rather
|
|
+# than as hand-coded addresses
|
|
+#
|
|
+# extra-y += vdso-syms.o
|
|
+# $(obj)/built-in.o: $(obj)/vdso-syms.o
|
|
+# $(obj)/built-in.o: ld_flags += -R (obj)/vdso-syms.o
|
|
+
|
|
+# SYSCFLAGS_vdso-syms.o = -r
|
|
+# $(obj)/vdso-syms.o: $(src)/vdso.lds \
|
|
+# $(obj)/vdso-lib.o $(obj)/vdso-note.o FORCE
|
|
+# $(call if_changed,vdso)
|
|
--- /dev/null
|
|
+++ b/arch/m68k/coldfire/vdso/vdso-bin.S
|
|
@@ -0,0 +1,14 @@
|
|
+/*
|
|
+ * Setup vdso lib (.so) as binary image.
|
|
+ */
|
|
+
|
|
+#include <linux/init.h>
|
|
+
|
|
+__INITDATA
|
|
+
|
|
+ .globl vdso_bin_start, vdso_bin_end
|
|
+vdso_bin_start:
|
|
+ .incbin "arch/m68k/coldfire/vdso/vdso-lib.so"
|
|
+vdso_bin_end:
|
|
+
|
|
+__FINIT
|
|
--- /dev/null
|
|
+++ b/arch/m68k/coldfire/vdso/vdso-lib.S
|
|
@@ -0,0 +1,57 @@
|
|
+/*
|
|
+ * VDSO userspace code
|
|
+ *
|
|
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
+ * Kurt Mahan <kmahan@freescale.com>
|
|
+ *
|
|
+ * This 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; either version 2 of the License, or
|
|
+ * (at your option) any later version.
|
|
+ */
|
|
+
|
|
+#include <linux/linkage.h>
|
|
+#include <asm/unistd.h>
|
|
+
|
|
+ .text
|
|
+/*
|
|
+ * Read the thread pointer into A0 (and D0, for compatibility).
|
|
+ */
|
|
+ENTRY(__kernel_read_tp)
|
|
+ .cfi_startproc
|
|
+ lea kuser_vdso_tp,%a0
|
|
+ movel (%a0), %d0
|
|
+ movel %d0,%a0
|
|
+ rts
|
|
+ .cfi_endproc
|
|
+ .size __kernel_read_tp,.-__kernel_read_tp
|
|
+
|
|
+/*
|
|
+ * Atomic compare exchange. Can not clobber any registers
|
|
+ * other than conditional codes.
|
|
+ */
|
|
+ENTRY(__kernel_atomic_cmpxchg_32)
|
|
+ .cfi_startproc
|
|
+ cmpl (%a0),%d0
|
|
+ bne label0
|
|
+ movel %d1, (%a0)
|
|
+ jmp label1
|
|
+label0:
|
|
+ movel (%a0),%d0
|
|
+label1:
|
|
+ rts
|
|
+ .cfi_endproc
|
|
+ .size __kernel_atomic_cmpxchg_32,.-__kernel_atomic_cmpxchg_32
|
|
+
|
|
+/*
|
|
+ * Atomic memory barrier. Can not clobber any registers
|
|
+ * other than condition codes.
|
|
+ */
|
|
+ENTRY(__kernel_atomic_barrier)
|
|
+ .cfi_startproc
|
|
+ /* no code needed for uniprocs */
|
|
+ rts
|
|
+ .cfi_endproc
|
|
+ .size __kernel_atomic_barrier,.-__kernel_atomic_barrier
|
|
+
|
|
+ .previous
|
|
--- /dev/null
|
|
+++ b/arch/m68k/coldfire/vdso/vdso-note.S
|
|
@@ -0,0 +1,27 @@
|
|
+/*
|
|
+ * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
|
|
+ * Here we can supply some information useful to userland.
|
|
+ *
|
|
+ * Based on arch/sh/kernel/vsyscall/vsyscall-note.S
|
|
+ */
|
|
+
|
|
+#include <linux/uts.h>
|
|
+#include <linux/version.h>
|
|
+
|
|
+#define ASM_ELF_NOTE_BEGIN(name, flags, vendor, type) \
|
|
+ .section name, flags; \
|
|
+ .balign 4; \
|
|
+ .long 1f - 0f; /* name length */ \
|
|
+ .long 3f - 2f; /* data length */ \
|
|
+ .long type; /* note type */ \
|
|
+0: .asciz vendor; /* vendor name */ \
|
|
+1: .balign 4; \
|
|
+2:
|
|
+
|
|
+#define ASM_ELF_NOTE_END \
|
|
+3: .balign 4; /* pad out section */ \
|
|
+ .previous
|
|
+
|
|
+ ASM_ELF_NOTE_BEGIN(".note.kernel-version", "a", UTS_SYSNAME, 0)
|
|
+ .long LINUX_VERSION_CODE
|
|
+ ASM_ELF_NOTE_END
|
|
--- /dev/null
|
|
+++ b/arch/m68k/coldfire/vdso/vdso.c
|
|
@@ -0,0 +1,124 @@
|
|
+/*
|
|
+ * arch/m68k/coldfire/vdso/vdso.c
|
|
+ *
|
|
+ * Based on arch/sh/kernel/vsyscall/vsyscall.c
|
|
+ *
|
|
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
+ * Kurt Mahan <kmahan@freescale.com>
|
|
+ *
|
|
+ * This 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; either version 2 of the License, or
|
|
+ * (at your option) any later version.
|
|
+ */
|
|
+
|
|
+#include <linux/mm.h>
|
|
+#include <linux/slab.h>
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/init.h>
|
|
+#include <linux/gfp.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/elf.h>
|
|
+#include <linux/sched.h>
|
|
+#include <linux/err.h>
|
|
+
|
|
+/* Mapping vDSO at the default address (what would've been returned
|
|
+ * if VDSO_MBASE was 0) makes it impossible to extend data segment
|
|
+ * (through brk()) for static binaries. The vDSO fits into one page,
|
|
+ * so map it just before TASK_UNMAPPED_BASE.
|
|
+ */
|
|
+#define VDSO_MBASE (TASK_UNMAPPED_BASE - PAGE_SIZE)
|
|
+#define VDSO_VAR_OFFSET 4096
|
|
+
|
|
+unsigned int vdso_enabled = 1;
|
|
+EXPORT_SYMBOL_GPL(vdso_enabled);
|
|
+
|
|
+static struct page *vdso_pages[1];
|
|
+
|
|
+/* _vdso_var_start: vdso_page_start + offset_4K */
|
|
+/* it's used to save key values from kernel */
|
|
+void *_vdso_var_start;
|
|
+void *_vdso_tp;
|
|
+
|
|
+extern const char vdso_bin_start, vdso_bin_end;
|
|
+
|
|
+int __init vdso_init(void)
|
|
+{
|
|
+ void *vdso_page = (void *)get_zeroed_page(GFP_ATOMIC);
|
|
+ vdso_pages[0] = virt_to_page(vdso_page);
|
|
+
|
|
+ _vdso_var_start = (void *)(vdso_page + VDSO_VAR_OFFSET);
|
|
+ _vdso_tp = _vdso_var_start;
|
|
+
|
|
+ printk(KERN_INFO "** VDSO_INIT\n");
|
|
+
|
|
+ /* copy dso bin in */
|
|
+ memcpy(vdso_page,
|
|
+ &vdso_bin_start, &vdso_bin_end - &vdso_bin_start);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/* setup VMA at program startup for the vdso page */
|
|
+int arch_setup_additional_pages(struct linux_binprm *bprm,
|
|
+ int executable_stack)
|
|
+{
|
|
+ struct mm_struct *mm = current->mm;
|
|
+ unsigned long addr;
|
|
+ int ret;
|
|
+
|
|
+ current->mm->context.vdso = 0;
|
|
+
|
|
+ down_write(&mm->mmap_sem);
|
|
+ addr = get_unmapped_area(NULL, VDSO_MBASE, PAGE_SIZE, 0, 0);
|
|
+ if (IS_ERR_VALUE(addr)) {
|
|
+ ret = addr;
|
|
+ goto up_fail;
|
|
+ }
|
|
+
|
|
+ ret = install_special_mapping(mm, addr, PAGE_SIZE,
|
|
+ VM_READ | VM_EXEC |
|
|
+ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |
|
|
+ VM_ALWAYSDUMP,
|
|
+ vdso_pages);
|
|
+
|
|
+ if (unlikely(ret))
|
|
+ goto up_fail;
|
|
+
|
|
+ current->mm->context.vdso = (void *)addr;
|
|
+
|
|
+up_fail:
|
|
+#ifdef DEBUG
|
|
+ printk(KERN_DEBUG "arch_setup_additional_pages: addr: %lx; ret: %d\n",
|
|
+ addr, ret);
|
|
+#endif
|
|
+
|
|
+ up_write(&mm->mmap_sem);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+/*
|
|
+ * check vma name
|
|
+ */
|
|
+const char *arch_vma_name(struct vm_area_struct *vma)
|
|
+{
|
|
+ if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
|
|
+ return "[vdso]";
|
|
+
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+struct vm_area_struct *get_gate_vma(struct task_struct *task)
|
|
+{
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+int in_gate_area(struct task_struct *task, unsigned long address)
|
|
+{
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+int in_gate_area_no_task(unsigned long address)
|
|
+{
|
|
+ return 0;
|
|
+}
|
|
--- /dev/null
|
|
+++ b/arch/m68k/coldfire/vdso/vdso.lds.S
|
|
@@ -0,0 +1,89 @@
|
|
+/*
|
|
+ * Linker script for vdso DSO. The vdso page is an ELF shared
|
|
+ * object prelinked to its virtual address, and with only one read-only
|
|
+ * segment (that fits in one page). This script controls its layout.
|
|
+ *
|
|
+ * Based on arch/sh/kernel/vsyscall/vsyscall.lds.S
|
|
+ *
|
|
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
+ * Kurt Mahan <kmahan@freescale.com>
|
|
+ *
|
|
+ * This 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; either version 2 of the License, or
|
|
+ * (at your option) any later version.
|
|
+ */
|
|
+
|
|
+OUTPUT_FORMAT("elf32-m68k", "elf32-m68k", "elf32-m68k")
|
|
+OUTPUT_ARCH(m68k)
|
|
+
|
|
+/* The ELF entry point can be used to set the AT_SYSINFO value. */
|
|
+ENTRY(__kernel_read_tp);
|
|
+ENTRY(__kernel_atomic_cmpxchg_32);
|
|
+ENTRY(__kernel_atomic_barrier);
|
|
+
|
|
+SECTIONS
|
|
+{
|
|
+ . = 0x5fffe000 + SIZEOF_HEADERS;
|
|
+
|
|
+ .hash : { *(.hash) } :text
|
|
+ .gnu.hash : { *(.gnu.hash) }
|
|
+ .dynsym : { *(.dynsym) }
|
|
+ .dynstr : { *(.dynstr) }
|
|
+ .gnu.version : { *(.gnu.version) }
|
|
+ .gnu.version_d : { *(.gnu.version_d) }
|
|
+ .gnu.version_r : { *(.gnu.version_r) }
|
|
+
|
|
+ /*
|
|
+ * This linker script is used both with -r and with -shared.
|
|
+ * For the layouts to match, we need to skip more than enough
|
|
+ * space for the dynamic symbol table et al. If this amount
|
|
+ * is insufficient, ld -shared will barf. Just increase it here.
|
|
+ */
|
|
+ . = 0x5fffe000 + 0x400;
|
|
+
|
|
+ .text : { *(.text) } :text
|
|
+ .note : { *(.note.*) } :text :note
|
|
+ .eh_frame_hdr : { *(.eh_frame_hdr ) } :text :eh_frame_hdr
|
|
+ .eh_frame : {
|
|
+ KEEP (*(.eh_frame))
|
|
+ LONG (0)
|
|
+ } :text
|
|
+ .dynamic : { *(.dynamic) } :text :dynamic
|
|
+ .useless : {
|
|
+ *(.got.plt) *(.got)
|
|
+ *(.data .data.* .gnu.linkonce.d.*)
|
|
+ *(.dynbss)
|
|
+ *(.bss .bss.* .gnu.linkonce.b.*)
|
|
+ } :text
|
|
+
|
|
+ . = 0x5fffe000 + 0x1000;
|
|
+ kuser_vdso_tp = .;
|
|
+}
|
|
+
|
|
+/*
|
|
+ * We must supply the ELF program headers explicitly to get just one
|
|
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
|
|
+ */
|
|
+PHDRS
|
|
+{
|
|
+ text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
|
|
+ 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);
|
|
|