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Re: [Qemu-devel] [PATCH 3/5] linux-user: fake /proc/self/maps
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [PATCH 3/5] linux-user: fake /proc/self/maps |
Date: |
Thu, 03 Nov 2011 20:28:36 +0100 |
User-agent: |
Thunderbird 2.0.0.23 (X11/20090817) |
Alexander Graf wrote:
> glibc's pthread_attr_getstack tries to find the stack range from
> /proc/self/maps. Unfortunately, /proc is usually the host's /proc
> which means linux-user guests see qemu's stack there.
>
> Fake the file with a constructed maps entry that exposes the guest's
> stack range.
>
> Signed-off-by: Alexander Graf <address@hidden>
> ---
> linux-user/syscall.c | 15 +++++++++++++++
> 1 files changed, 15 insertions(+), 0 deletions(-)
>
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 38953ba..a51b457 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -4600,6 +4600,20 @@ int get_osversion(void)
> return osversion;
> }
>
> +
> +static int open_self_maps(void *cpu_env, int fd)
> +{
> + TaskState *ts = ((CPUState *)cpu_env)->opaque;
> +
> + dprintf(fd, "%08llx-%08llx rw-p %08llx 00:00 0 [stack]\n",
> + (unsigned long long)ts->info->stack_limit,
> + (unsigned long long)(ts->stack_base + (TARGET_PAGE_SIZE - 1))
> + & TARGET_PAGE_MASK,
>
This needs to be guarded by:
#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
Any idea how to fetch the stack range from somewhere else for other archs?
Alex
Re: [Qemu-devel] [PATCH 0/5] linux-user: fake some /proc/self entries, Riku Voipio, 2011/11/03