[src/trunk]: src/lib/libpthread/arch/x86_64 Make sure the stack stays aligned.

[fvdl <fvdl%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/eafd4e9ba44e
branches:  trunk
changeset: 553670:eafd4e9ba44e
user:      fvdl <fvdl%NetBSD.org@localhost>
date:      Sun Oct 19 21:45:03 2003 +0000

description:
Make sure the stack stays aligned.

diffstat:

 lib/libpthread/arch/x86_64/pthread_switch.S |  22 +++++++---------------
 1 files changed, 7 insertions(+), 15 deletions(-)

diffs (59 lines):

diff -r efd38dc6ecc2 -r eafd4e9ba44e lib/libpthread/arch/x86_64/pthread_switch.S
--- a/lib/libpthread/arch/x86_64/pthread_switch.S       Sun Oct 19 20:45:27 2003 +0000
+++ b/lib/libpthread/arch/x86_64/pthread_switch.S       Sun Oct 19 21:45:03 2003 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pthread_switch.S,v 1.6 2003/09/07 14:47:57 cl Exp $    */
+/*     $NetBSD: pthread_switch.S,v 1.7 2003/10/19 21:45:03 fvdl Exp $  */
 
 /*-
  * Copyright (c) 2001 The NetBSD Foundation, Inc.
@@ -126,13 +126,9 @@
        movq    %rsi,%r13
        /* r12 (eax) holds the current thread        */
        /* r13 (ecx) holds the thread to switch to */
-       subq    $CONTEXTSIZE+12, %rsp   /* Allocate space for the ucontext_t */
-       leaq    12(%rsp), %r14
+       subq    $CONTEXTSIZE+8, %rsp    /* Allocate space for the ucontext_t */
+       leaq    8(%rsp), %r14
        andq    $~(0xf), %r14           /* 16-byte-align the ucontext_t area */
-       /*
-        * Note: Alignment space below the ucontext_t can consume up to
-        * 12 bytes of STACKSPACE.
-        */
        movq    %r14,%rdi
        call    PIC_PLT(_C_LABEL(_getcontext_u))
        /*
@@ -153,7 +149,7 @@
        call    PIC_PLT(_C_LABEL(_setcontext_u))
 NENTRY(pthread__switch_return_point)
        /* We're back on the original stack. */
-       addq    $CONTEXTSIZE+12, %rsp
+       addq    $CONTEXTSIZE+8, %rsp
        popq    %r14
        popq    %r13
        popq    %r12
@@ -200,13 +196,9 @@
        movq    %rsi, %r13
        movq    %rdx, %r14
        incl    PT_SPINLOCKS(%r13)      /* Make sure we get continued        */
-       subq    $CONTEXTSIZE+12, %rsp   /* Allocate space for the ucontext_t */
-       leaq    12(%rsp), %r15
+       subq    $CONTEXTSIZE+8, %rsp    /* Allocate space for the ucontext_t */
+       leaq    8(%rsp), %r15
        andq    $~(0xf), %r15           /* 16-byte-align the ucontext_t area */
-       /*
-        * Note: Alignment space below the ucontext_t can consume up to
-        * 12 bytes of STACKSPACE.
-        */
        movq    %r15, %rdi
        call    PIC_PLT(_C_LABEL(_getcontext_u))
        /*
@@ -279,7 +271,7 @@
        call    PIC_PLT(_C_LABEL(_setcontext_u))
 locked_return_point:
        /* We're back on the original stack. */
-       addq    $CONTEXTSIZE+12, %rsp
+       addq    $CONTEXTSIZE+8, %rsp
        popq    %r15
        popq    %r14
        popq    %r13