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authorAlexander Graf <agraf@suse.de>2011-11-02 20:23:24 +0100
committerRiku Voipio <riku.voipio@linaro.org>2012-02-02 17:51:20 +0200
commit36c08d498b8ea6995666b805d37c6bb14da66a97 (patch)
tree62e0e954e4c889e295088dd87ddb7b743efd0fda /linux-user
parent3be14d05d45774b67398debe42e3bb5524998f4f (diff)
linux-user: fake /proc/self/maps
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>
Diffstat (limited to 'linux-user')
-rw-r--r--linux-user/syscall.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index e100025b0d..1864d7fa12 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,
+ (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 }
};