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Subject[PATCH 5/7] uml - tls support: hack to make it compile on any host
Date
From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>

Copy the definition of struct user_desc (with another name) for use by userspace
sources (where we use the host headers, and we can't be sure about their
content) to make sure UML compiles.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
---

arch/um/include/os.h | 7 ++++---
arch/um/include/sysdep-i386/tls.h | 28 ++++++++++++++++++++++++++++
arch/um/include/sysdep-x86_64/tls.h | 29 +++++++++++++++++++++++++++++
arch/um/os-Linux/tls.c | 15 +++++++--------
4 files changed, 68 insertions(+), 11 deletions(-)

diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 90869a7..b14d403 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -13,6 +13,7 @@
#include "kern_util.h"
#include "skas/mm_id.h"
#include "irq_user.h"
+#include "sysdep/tls.h"

#define OS_TYPE_FILE 1
#define OS_TYPE_DIR 2
@@ -236,10 +237,10 @@ extern int helper_wait(int pid);


/* tls.c */
-extern int os_set_thread_area(void *data, int pid);
-extern int os_get_thread_area(void *data, int pid);
-/* umid.c */
+extern int os_set_thread_area(user_desc_t *info, int pid);
+extern int os_get_thread_area(user_desc_t *info, int pid);

+/* umid.c */
extern int umid_file_name(char *name, char *buf, int len);
extern int set_umid(char *name);
extern char *get_umid(void);
diff --git a/arch/um/include/sysdep-i386/tls.h b/arch/um/include/sysdep-i386/tls.h
new file mode 100644
index 0000000..938f953
--- /dev/null
+++ b/arch/um/include/sysdep-i386/tls.h
@@ -0,0 +1,28 @@
+#ifndef _SYSDEP_TLS_H
+#define _SYSDEP_TLS_H
+
+# ifndef __KERNEL__
+
+/* Change name to avoid conflicts with the original one from <asm/ldt.h>, which
+ * may be named user_desc (but in 2.4 and in header matching its API was named
+ * modify_ldt_ldt_s). */
+
+typedef struct um_dup_user_desc {
+ unsigned int entry_number;
+ unsigned int base_addr;
+ unsigned int limit;
+ unsigned int seg_32bit:1;
+ unsigned int contents:2;
+ unsigned int read_exec_only:1;
+ unsigned int limit_in_pages:1;
+ unsigned int seg_not_present:1;
+ unsigned int useable:1;
+} user_desc_t;
+
+# else /* __KERNEL__ */
+
+# include <asm/ldt.h>
+typedef struct user_desc user_desc_t;
+
+# endif /* __KERNEL__ */
+#endif /* _SYSDEP_TLS_H */
diff --git a/arch/um/include/sysdep-x86_64/tls.h b/arch/um/include/sysdep-x86_64/tls.h
new file mode 100644
index 0000000..35f19f2
--- /dev/null
+++ b/arch/um/include/sysdep-x86_64/tls.h
@@ -0,0 +1,29 @@
+#ifndef _SYSDEP_TLS_H
+#define _SYSDEP_TLS_H
+
+# ifndef __KERNEL__
+
+/* Change name to avoid conflicts with the original one from <asm/ldt.h>, which
+ * may be named user_desc (but in 2.4 and in header matching its API was named
+ * modify_ldt_ldt_s). */
+
+typedef struct um_dup_user_desc {
+ unsigned int entry_number;
+ unsigned int base_addr;
+ unsigned int limit;
+ unsigned int seg_32bit:1;
+ unsigned int contents:2;
+ unsigned int read_exec_only:1;
+ unsigned int limit_in_pages:1;
+ unsigned int seg_not_present:1;
+ unsigned int useable:1;
+ unsigned int lm:1;
+} user_desc_t;
+
+# else /* __KERNEL__ */
+
+# include <asm/ldt.h>
+typedef struct user_desc user_desc_t;
+
+# endif /* __KERNEL__ */
+#endif /* _SYSDEP_TLS_H */
diff --git a/arch/um/os-Linux/tls.c b/arch/um/os-Linux/tls.c
index 63dfcf7..642db55 100644
--- a/arch/um/os-Linux/tls.c
+++ b/arch/um/os-Linux/tls.c
@@ -1,6 +1,7 @@
#include <errno.h>
#include <sys/ptrace.h>
#include <asm/ldt.h>
+#include "sysdep/tls.h"
#include "uml-config.h"

/* TLS support - we basically rely on the host's one.*/
@@ -18,9 +19,8 @@
#define PTRACE_SET_THREAD_AREA 26
#endif

-int os_set_thread_area(void *data, int pid)
+int os_set_thread_area(user_desc_t *info, int pid)
{
- struct user_desc *info = data;
int ret;

ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
@@ -32,9 +32,8 @@ int os_set_thread_area(void *data, int p

#ifdef UML_CONFIG_MODE_SKAS

-int os_get_thread_area(void *data, int pid)
+int os_get_thread_area(user_desc_t *info, int pid)
{
- struct user_desc *info = data;
int ret;

ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
@@ -49,10 +48,10 @@ int os_get_thread_area(void *data, int p
#ifdef UML_CONFIG_MODE_TT
#include "linux/unistd.h"

-_syscall1(int, get_thread_area, struct user_desc *, u_info);
-_syscall1(int, set_thread_area, struct user_desc *, u_info);
+_syscall1(int, get_thread_area, user_desc_t *, u_info);
+_syscall1(int, set_thread_area, user_desc_t *, u_info);

-int do_set_thread_area_tt(struct user_desc *info)
+int do_set_thread_area_tt(user_desc_t *info)
{
int ret;

@@ -63,7 +62,7 @@ int do_set_thread_area_tt(struct user_de
return ret;
}

-int do_get_thread_area_tt(struct user_desc *info)
+int do_get_thread_area_tt(user_desc_t *info)
{
int ret;

-
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