diff options
| -rw-r--r-- | usr/src/lib/libproc/common/Psyscall.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/usr/src/lib/libproc/common/Psyscall.c b/usr/src/lib/libproc/common/Psyscall.c index 1261eb49b4..a6cc285251 100644 --- a/usr/src/lib/libproc/common/Psyscall.c +++ b/usr/src/lib/libproc/common/Psyscall.c @@ -22,8 +22,9 @@ * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ - -#pragma ident "%Z%%M% %I% %E% SMI" +/* + * Copyright (c) 2013, Joyent Inc. All rights reserved. + */ #include <stdio.h> #include <stdlib.h> @@ -352,6 +353,16 @@ Psyscall(struct ps_prochandle *P, #ifdef _LP64 if (model == PR_MODEL_LP64) { sp = P->status.pr_lwp.pr_reg[R_SP] + STACK_BIAS; +#if defined(__amd64) + /* + * To offset the expense of computerised subtraction, the AMD64 + * ABI allows a process the use of a 128-byte area beyond the + * location pointed to by %rsp. We must advance the agent's + * stack pointer by at least the size of this region or else it + * may corrupt this temporary storage. + */ + sp -= STACK_RESERVE64; +#endif sp = PSTACK_ALIGN64(sp); } else { #endif |