diff options
Diffstat (limited to 'usr/src/uts/intel/sys/ucontext.h')
| -rw-r--r-- | usr/src/uts/intel/sys/ucontext.h | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/usr/src/uts/intel/sys/ucontext.h b/usr/src/uts/intel/sys/ucontext.h index acd6ddc99e..26f5923930 100644 --- a/usr/src/uts/intel/sys/ucontext.h +++ b/usr/src/uts/intel/sys/ucontext.h @@ -20,6 +20,9 @@ */ /* + * Copyright 2015 Joyent, Inc. + */ +/* * Copyright 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ @@ -82,9 +85,16 @@ struct __ucontext { sigset_t uc_sigmask; stack_t uc_stack; mcontext_t uc_mcontext; - long uc_filler[5]; /* see ABI spec for Intel386 */ + /* + * The Intel386 ABI specification includes a 5-element array of longs + * called "uc_filler", padding the size of the struct to 512 bytes. To + * allow zone brands to communicate extra data right the way through + * the signal handling process, from sigacthandler to setcontext, we + * steal the first three of these longs as a brand-private member. + */ + void *uc_brand_data[3]; + long uc_filler[2]; }; - #if defined(_SYSCALL32) /* Kernel view of user ILP32 ucontext structure */ @@ -95,7 +105,8 @@ typedef struct ucontext32 { sigset_t uc_sigmask; stack32_t uc_stack; mcontext32_t uc_mcontext; - int32_t uc_filler[5]; + caddr32_t uc_brand_data[3]; + int32_t uc_filler[2]; } ucontext32_t; #if defined(_KERNEL) |