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[Qemu-devel] [PATCH 4/5] linux-user: fake /proc/self/stat
From: |
Alexander Graf |
Subject: |
[Qemu-devel] [PATCH 4/5] linux-user: fake /proc/self/stat |
Date: |
Wed, 2 Nov 2011 20:23:25 +0100 |
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 <address@hidden>
---
linux-user/syscall.c | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index a51b457..aaecf53 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -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 }
};
--
1.6.0.2
Re: [Qemu-devel] [PATCH 0/5] linux-user: fake some /proc/self entries, Riku Voipio, 2011/11/03