diff options
author | Richard Weinberger <richard@nod.at> | 2011-07-26 00:12:53 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 03:57:13 (GMT) |
commit | 548f0a4e02f6fa33278e77a2a6477cdeb512317f (patch) | |
tree | c1e3830dd6ad0561745452134ec64fd1fa7656a2 /arch/um/sys-i386 | |
parent | b743ac54e54ca18fb7164a97cc77cf1ccee0b0f7 (diff) | |
download | linux-548f0a4e02f6fa33278e77a2a6477cdeb512317f.tar.xz |
um: Set __HAVE_ARCH_GATE_AREA for i386
When UML is unable to reuse the host's vDSO FIXADDR_USER_START is zero.
To handle this special case correclty we have to implement custom gate
area helper methods.
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/sys-i386')
-rw-r--r-- | arch/um/sys-i386/Makefile | 2 | ||||
-rw-r--r-- | arch/um/sys-i386/asm/elf.h | 2 | ||||
-rw-r--r-- | arch/um/sys-i386/mem.c | 62 |
3 files changed, 65 insertions, 1 deletions
diff --git a/arch/um/sys-i386/Makefile b/arch/um/sys-i386/Makefile index 87b659d..3923cfb 100644 --- a/arch/um/sys-i386/Makefile +++ b/arch/um/sys-i386/Makefile @@ -4,7 +4,7 @@ obj-y = bug.o bugs.o checksum.o delay.o fault.o ksyms.o ldt.o ptrace.o \ ptrace_user.o setjmp.o signal.o stub.o stub_segv.o syscalls.o sysrq.o \ - sys_call_table.o tls.o atomic64_cx8_32.o + sys_call_table.o tls.o atomic64_cx8_32.o mem.o obj-$(CONFIG_BINFMT_ELF) += elfcore.o diff --git a/arch/um/sys-i386/asm/elf.h b/arch/um/sys-i386/asm/elf.h index d964a41..4230555 100644 --- a/arch/um/sys-i386/asm/elf.h +++ b/arch/um/sys-i386/asm/elf.h @@ -105,6 +105,8 @@ extern unsigned long __kernel_vsyscall; #define FIXADDR_USER_START VSYSCALL_BASE #define FIXADDR_USER_END VSYSCALL_END +#define __HAVE_ARCH_GATE_AREA 1 + /* * Architecture-neutral AT_ values in 0-17, leave some room * for more of them, start the x86-specific ones at 32. diff --git a/arch/um/sys-i386/mem.c b/arch/um/sys-i386/mem.c new file mode 100644 index 0000000..639900a --- /dev/null +++ b/arch/um/sys-i386/mem.c @@ -0,0 +1,62 @@ +/* + * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/mm.h> +#include <asm/page.h> +#include <asm/mman.h> + +static struct vm_area_struct gate_vma; + +static int __init gate_vma_init(void) +{ + if (!FIXADDR_USER_START) + return 0; + + gate_vma.vm_mm = NULL; + gate_vma.vm_start = FIXADDR_USER_START; + gate_vma.vm_end = FIXADDR_USER_END; + gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; + gate_vma.vm_page_prot = __P101; + + /* + * Make sure the vDSO gets into every core dump. + * Dumping its contents makes post-mortem fully interpretable later + * without matching up the same kernel and hardware config to see + * what PC values meant. + */ + gate_vma.vm_flags |= VM_ALWAYSDUMP; + + return 0; +} +__initcall(gate_vma_init); + +struct vm_area_struct *get_gate_vma(struct mm_struct *mm) +{ + return FIXADDR_USER_START ? &gate_vma : NULL; +} + +int in_gate_area_no_mm(unsigned long addr) +{ + if (!FIXADDR_USER_START) + return 0; + + if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END)) + return 1; + + return 0; +} + +int in_gate_area(struct mm_struct *mm, unsigned long addr) +{ + struct vm_area_struct *vma = get_gate_vma(mm); + + if (!vma) + return 0; + + return (addr >= vma->vm_start) && (addr < vma->vm_end); +} |