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tile: make the prolog of clone() more conformant 

With this change we properly set up the frame first, and tear
it down last, doing argument checking only when the frame is set up.
This commit is contained in:
Chris Metcalf 2014-09-25 16:53:03 -04:00
parent d9cd52e64d
commit 83d641efd1
2 changed files with 9 additions and 5 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2014-10-02 Chris Metcalf <cmetcalf@tilera.com>
* sysdeps/unix/sysv/linux/tile/clone.S (__clone): Fix code
to set up frame more cleanly.
* sysdeps/tile/memcmp.c: New file.
* sysdeps/unix/sysv/linux/tile/sysconf.c: New file.

11
sysdeps/unix/sysv/linux/tile/clone.S
View File

@ -41,10 +41,6 @@
.text
ENTRY (__clone)
/* sanity check arguments */
BEQZ r0, .Linvalid
BEQZ r1, .Linvalid
/* Create a stack frame so we can pass callee-saves to new task. */
{
move r10, sp
@ -71,6 +67,10 @@ ENTRY (__clone)
ST r11, r32
cfi_offset (r32, FRAME_R32 - FRAME_SIZE)
/* sanity check arguments */
BEQZ r0, .Linvalid
BEQZ r1, .Linvalid
/* Make sure child stack is properly aligned, and set up the
top frame so that we can call out of it immediately in the
child. Setting it up here means we fault in the parent if
@ -120,6 +120,7 @@ ENTRY (__clone)
swint1
BEQZ r0, .Lthread_start /* If in child task. */
.Ldone:
/* Restore the callee-saved registers and return. */
ADDLI_PTR lr, sp, FRAME_SIZE
{
@ -149,7 +150,7 @@ ENTRY (__clone)
.Linvalid:
{
movei r1, EINVAL
j SYSCALL_ERROR_NAME
j .Ldone
}
/* This function expects to receive: