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linux-user: fake /proc/self/maps

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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 <agraf@suse.de>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Alexander Graf 2011-11-02 20:23:24 +01:00 committed by Riku Voipio
parent 3be14d05d4
commit 36c08d498b
1 changed files with 15 additions and 0 deletions
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15
linux-user/syscall.c
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@ -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,
(unsigned long long)ts->stack_base);
return 0;
}
static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode)
{
struct fake_open {
@ -4608,6 +4622,7 @@ static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode)
};
const struct fake_open *fake_open;
static const struct fake_open fakes[] = {
{ "/proc/self/maps", open_self_maps },
{ NULL, NULL }
};