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| author | Joshua M. Clulow <jmc@joyent.com> | 2013-01-10 22:03:52 +0000 |
|---|---|---|
| committer | Joshua M. Clulow <jmc@joyent.com> | 2013-01-10 22:34:45 +0000 |
| commit | 2d69bb42a6f21808dbe14d78ee609773622e989e (patch) | |
| tree | 300b2d3a49c1eb1df2a961e66f08cdb188470917 | |
| parent | c246eda8e7ab4268e1774123454e9b3132863115 (diff) | |
| download | illumos-joyent-2d69bb42a6f21808dbe14d78ee609773622e989e.tar.gz | |
OS-1804 agent lwp clobbers amd64 abi stack redzone20130110release-20130110
Reviewed by: Robert Mustacchi <rm@joyent.com>
| -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 |