x86: fix sigcontext.h user export

Jakub Jelinek reported that some user-space code that relies on
kernel headers has built dependency on the sigcontext->eip/rip
register names - which have been unified in commit:

  commit 742fa54a62be6a263df14a553bf832724471dfbe
  Author: H. Peter Anvin <hpa@zytor.com>
  Date:   Wed Jan 30 13:30:56 2008 +0100

      x86: use generic register names in struct sigcontext

so give the old layout to user-space. This is not particularly
pretty, but it's an ABI so there's no danger of the two definitions
getting out of sync.

Reported-by: Jakub Jelinek <jakub@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 66 insertions, 0 deletions

diff --git a/include/asm-x86/sigcontext.h b/include/asm-x86/sigcontext.h
index 681deade5f00..d743947f4c77 100644
--- a/include/asm-x86/sigcontext.h
+++ b/include/asm-x86/sigcontext.h
@@ -58,6 +58,7 @@ struct _fpstate {
 
 #define X86_FXSR_MAGIC          0x0000
 
+#ifdef __KERNEL__
 struct sigcontext {
         unsigned short gs, __gsh;
         unsigned short fs, __fsh;
@@ -82,6 +83,35 @@ struct sigcontext {
         unsigned long oldmask;
         unsigned long cr2;
 };
+#else /* __KERNEL__ */
+/*
+ * User-space might still rely on the old definition:
+ */
+struct sigcontext {
+        unsigned short gs, __gsh;
+        unsigned short fs, __fsh;
+        unsigned short es, __esh;
+        unsigned short ds, __dsh;
+        unsigned long edi;
+        unsigned long esi;
+        unsigned long ebp;
+        unsigned long esp;
+        unsigned long ebx;
+        unsigned long edx;
+        unsigned long ecx;
+        unsigned long eax;
+        unsigned long trapno;
+        unsigned long err;
+        unsigned long eip;
+        unsigned short cs, __csh;
+        unsigned long eflags;
+        unsigned long esp_at_signal;
+        unsigned short ss, __ssh;
+        struct _fpstate __user * fpstate;
+        unsigned long oldmask;
+        unsigned long cr2;
+};
+#endif /* !__KERNEL__ */
 
 #else /* __i386__ */
 
@@ -102,6 +132,7 @@ struct _fpstate {
         __u32   reserved2[24];
 };
 
+#ifdef __KERNEL__
 struct sigcontext {
         unsigned long r8;
         unsigned long r9;
@@ -132,6 +163,41 @@ struct sigcontext {
         struct _fpstate __user *fpstate;        /* zero when no FPU context */
         unsigned long reserved1[8];
 };
+#else /* __KERNEL__ */
+/*
+ * User-space might still rely on the old definition:
+ */
+struct sigcontext {
+        unsigned long r8;
+        unsigned long r9;
+        unsigned long r10;
+        unsigned long r11;
+        unsigned long r12;
+        unsigned long r13;
+        unsigned long r14;
+        unsigned long r15;
+        unsigned long rdi;
+        unsigned long rsi;
+        unsigned long rbp;
+        unsigned long rbx;
+        unsigned long rdx;
+        unsigned long rax;
+        unsigned long rcx;
+        unsigned long rsp;
+        unsigned long rip;
+        unsigned long eflags;           /* RFLAGS */
+        unsigned short cs;
+        unsigned short gs;
+        unsigned short fs;
+        unsigned short __pad0;
+        unsigned long err;
+        unsigned long trapno;
+        unsigned long oldmask;
+        unsigned long cr2;
+        struct _fpstate __user *fpstate;        /* zero when no FPU context */
+        unsigned long reserved1[8];
+};
+#endif /* !__KERNEL__ */
 
 #endif /* !__i386__ */