Hi to the list,
I'm going throu the 32bit on 64bit on debian 4, as first I had a problem
with the host kernel to run 32bits uml kernels, I solve it installing a
vanilla 2.6.18.8 patch it for debian and then I could start a prebuilted
kernel from nagafix(the 2.6.23) but I got the arch_switch_tls_skas
problem, I patched the kernel with the x86-64-support.diff from the bb1
branch
http://www.user-mode-linux.org/~blaisorblade/patches/guest/uml-2.6.18-bb1/broken-out/tls/
One hunk failed
patching file arch/um/os-Linux/sys-i386/tls.c
Hunk #1 FAILED at 1.
Hunk #2 FAILED at 28.
2 out of 2 hunks FAILED -- saving rejects to file
arch/um/os-Linux/sys-i386/tls.c.rej
This is it, sorry I'm not able to fix it:
$ cat arch/um/os-Linux/sys-i386/tls.c.rej
***
*** 1,16
#include
#include
#include "sysdep/tls.h"
#include "user_util.h"
static _syscall1(int, get_thread_area, user_desc_t *, u_info);
/* Checks whether host supports TLS, and sets *tls_min according to
the value
* valid on the host.
* i386 host have it == 6; x86_64 host have it == 12, for i386
emulation. */
- void check_host_supports_tls(int *supports_tls, int *tls_min) {
/* Values for x86 and x86_64.*/
- int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64};
int i;
for (i = 0; i < ARRAY_SIZE(val); i++) {
--- 1,26
+ #include
+ #include
#include
#include
#include "sysdep/tls.h"
#include "user_util.h"
+ #include "os.h"
+ #include "uml-config.h"
+
+ /* TLS support - we basically rely on the host's one.*/
static _syscall1(int, get_thread_area, user_desc_t *, u_info);
+ //XXX: should get this from an include!
+ extern int host_gdt_entry_tls_min;
+
/* Checks whether host supports TLS, and sets *tls_min according to
the value
* valid on the host.
* i386 host have it == 6; x86_64 host have it == 12, for i386
emulation. */
+ int check_host_supports_tls()
+ {
/* Values for x86 and x86_64.*/
+ int val[] = { GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64 };
int i;
for (i = 0; i < ARRAY_SIZE(val); i++) {
*** void check_host_supports_tls(int *suppor
*** 18,34
info.entry_number = val[i];
if (get_thread_area(&info) == 0) {
- *tls_min = val[i];
- *supports_tls = 1;
- return;
} else {
if (errno == EINVAL)
continue;
else if (errno == ENOSYS)
- *supports_tls = 0;
- return;
}
}
- *supports_tls = 0;
}
--- 28,110
info.entry_number = val[i];
if (get_thread_area(&info) == 0) {
+ host_gdt_entry_tls_min = val[i];
+ return 1;
} else {
if (errno == EINVAL)
continue;
else if (errno == ENOSYS)
+ return 0;
}
}
+ return 0;
+ }
+
+ /* In TT mode, this should be called only by the tracing thread, and
makes sense
+ * only for PTRACE_SET_THREAD_AREA. In SKAS mode, it's used normally.
+ *
+ */
+
+ #ifndef PTRACE_GET_THREAD_AREA
+ #define PTRACE_GET_THREAD_AREA 25
+ #endif
+
+ #ifndef PTRACE_SET_THREAD_AREA
+ #define PTRACE_SET_THREAD_AREA 26
+ #endif
+
+ int os_set_thread_area(user_desc_t *info, int pid)
+ {
+ int ret;
+
+ ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
+(unsigned long) info);
+ if (ret < 0)
+ ret = -errno;
+ return ret;
+ }
+
+ #ifdef UML_CONFIG_MODE_SKAS
+
+ int os_get_thread_area(user_desc_t *info, int pid)
+ {
+ int ret;
+
+ ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
+(unsigned long) info);
+ if (ret < 0)
+ ret = -errno;
+ return ret;
+ }
+
+ #endif
+
+ #ifdef UML_CONFIG_MODE_TT
+ #include "linux/unistd.h"
+
+ static _syscall1(int, set_thread_area, user_desc_t *, u_info);
+
+ int do_set_thread_area_tt(user_desc_t *info)
+ {
+ int ret;
+
+ ret = set_thread_area(info);
+ if (ret < 0) {
+ ret = -errno;
+ }
+ return ret;
+ }
+
+ int do_get_thread_area_tt(user_desc_t *info)
+ {
+ int ret;
+
+ ret = get_thread_area(info);
+ if (ret < 0) {
+ ret = -errno;
+ }
+ return ret;
}
+
+ #endif /* UML_CONFIG_MODE_TT */
And another one:
***
*** 1,76
- #include
- #include
- #include
- #include "sysdep/tls.h"
- #include "uml-config.h"
-
- /* TLS support - we basically rely on the host's one.*/
-
- /* In TT mode, this should be called only by the tracing thread, and
makes sense
- * only for PTRACE_SET_THREAD_AREA. In SKAS mode, it's used normally.
- *
- */
-
- #if
