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linux-user: fake /proc/self/stat

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The boehm gc finds the program's stack starting pointer by
checking /proc/self/stat. Unfortunately, so far it reads
qemu's stack pointer which clearly is wrong.

So let's instead fake the file so the guest program sees the
right address.

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 20:23:25 +01:00 committed by Riku Voipio
parent 36c08d498b
commit 480b8e7dd5
1 changed files with 26 additions and 0 deletions
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26
linux-user/syscall.c
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@ -4614,6 +4614,31 @@ static int open_self_maps(void *cpu_env, int fd)
return 0;
}
static int open_self_stat(void *cpu_env, int fd)
{
TaskState *ts = ((CPUState *)cpu_env)->opaque;
abi_ulong start_stack = ts->info->start_stack;
int i;
for (i = 0; i < 44; i++) {
char buf[128];
int len;
uint64_t val = 0;
if (i == 27) {
/* stack bottom */
val = start_stack;
}
snprintf(buf, sizeof(buf), "%"PRId64 "%c", val, i == 43 ? '\n' : ' ');
len = strlen(buf);
if (write(fd, buf, len) != len) {
return -1;
}
}
return 0;
}
static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode)
{
struct fake_open {
@ -4623,6 +4648,7 @@ 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 },
{ "/proc/self/stat", open_self_stat },
{ NULL, NULL }
};