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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2006-02-01 03:06:28 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-01 08:53:23 -0800
commit4cd7ed94428babb0cdbf08cc14c257e223186079 (patch)
treefd0b8740cefb9d7d8606a82f11f9004484b47fd9
parente5cf888631af95c8022d659d77fb595e0c3ac778 (diff)
[PATCH] uml: skas0-hold-own-ldt fixups for x86-64
In a recent fixup i386 code was copied raw to x86_64 subarch to make it compile again. Here there are some little fixups and resyncs needed for it (mainly for cleanliness sake) - I did an audit and found the rest of the code to be safe. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/asm-um/ldt-x86_64.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/asm-um/ldt-x86_64.h b/include/asm-um/ldt-x86_64.h
index 57159f12dde..96b35aada79 100644
--- a/include/asm-um/ldt-x86_64.h
+++ b/include/asm-um/ldt-x86_64.h
@@ -39,11 +39,13 @@ typedef struct uml_ldt {
} uml_ldt_t;
/*
- * macros stolen from include/asm-i386/desc.h
+ * macros stolen from include/asm-x86_64/desc.h
*/
#define LDT_entry_a(info) \
((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
+/* Don't allow setting of the lm bit. It is useless anyways because
+ * 64bit system calls require __USER_CS. */
#define LDT_entry_b(info) \
(((info)->base_addr & 0xff000000) | \
(((info)->base_addr & 0x00ff0000) >> 16) | \
@@ -54,6 +56,7 @@ typedef struct uml_ldt {
((info)->seg_32bit << 22) | \
((info)->limit_in_pages << 23) | \
((info)->useable << 20) | \
+ /* ((info)->lm << 21) | */ \
0x7000)
#define LDT_empty(info) (\
@@ -64,6 +67,7 @@ typedef struct uml_ldt {
(info)->seg_32bit == 0 && \
(info)->limit_in_pages == 0 && \
(info)->seg_not_present == 1 && \
- (info)->useable == 0 )
+ (info)->useable == 0 && \
+ (info)->lm == 0)
#endif