Change x86_64_regs struct type from pt_regs to user_regs_struct
* syscall.c: Change x86_64_regs struct type from
pt_regs to user_regs_struct, and explain the change in comment.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
diff --git a/syscall.c b/syscall.c
index d356006..9c04cf9 100644
--- a/syscall.c
+++ b/syscall.c
@@ -737,7 +737,13 @@
# if defined(I386)
struct pt_regs i386_regs;
# elif defined(X86_64)
-static struct pt_regs x86_64_regs;
+/*
+ * On 32 bits, pt_regs and user_regs_struct are the same,
+ * but on 64 bits, user_regs_struct has six more fields:
+ * fs_base, gs_base, ds, es, fs, gs.
+ * PTRACE_GETREGS fills them too, so struct pt_regs would overflow.
+ */
+static struct user_regs_struct x86_64_regs;
# elif defined (IA64)
long r8, r10, psr; /* TODO: make static? */
long ia32 = 0; /* not static */