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authorYoshinori Sato <ysato@users.sourceforge.jp>2015-05-24 02:06:24 +0900
committerWaldemar Brodkorb <wbx@openadk.org>2015-06-10 10:19:39 -0500
commite364302aeaa7fc4f18c66acdbba5dd2c14f77555 (patch)
tree51042019ec3b837fb953730c688f902b921780b0 /libc/sysdeps/linux/h8300/clone.S
parente9fd792344b30b370346d0224d54edb6a96d5cff (diff)
h8300: Assembly functions
- remove symbol prefix - new startup - new clone syscall support Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'libc/sysdeps/linux/h8300/clone.S')
-rw-r--r--libc/sysdeps/linux/h8300/clone.S36
1 files changed, 25 insertions, 11 deletions
diff --git a/libc/sysdeps/linux/h8300/clone.S b/libc/sysdeps/linux/h8300/clone.S
index 554a29703..a00eba4cb 100644
--- a/libc/sysdeps/linux/h8300/clone.S
+++ b/libc/sysdeps/linux/h8300/clone.S
@@ -1,5 +1,4 @@
-/* Adapted from glibc */
-/* Copyright (C) 1996, 1997 Free Software Foundation, Inc. */
+/* Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp> */
/* clone is even more special than fork as it mucks with stacks
and invokes a function in the right context after its all over. */
@@ -8,7 +7,8 @@
#include <bits/errno.h>
#include <sys/syscall.h>
-/* int _clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
+/* int _clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg
+ void *parent_tidptr, void *tls, void *child_tidptr) */
#ifdef __H8300H__
.h8300h
@@ -18,8 +18,8 @@
#endif
.text
-.globl _clone
-_clone:
+.globl clone
+clone:
/* Sanity check arguments. */
mov.l #-EINVAL,er3
mov.l er0,er0 /* no NULL function pointers */
@@ -31,13 +31,25 @@ _clone:
mov.l @(4:16,sp),er3
mov.l er3,@-er1
- /* Do the system call */
+ /* setup argument */
mov.l er0,er3 /* er3 = child entry */
- mov.l er1,er0
- mov.l er2,er1 /* er1 = flags */
- mov.l er0,er2 /* er2 = child sp */
- mov.l #__NR_clone,r0
+ sub.l #20,sp
+ mov.l er2,@sp /* flags */
+ mov.l er1,@(4,sp) /* new sp */
+ mov.l sp,er1
+ mov.l @(20+8,sp),er0
+ mov.l er0,@er1 /* parent tid */
+ adds #4,er1
+ mov.l @(20+16,sp),er0
+ mov.l er0,@er1 /* child tid */
+ adds #4,er1
+ mov.l @(20+12,sp),er0
+ mov.l er0,@er1 /* tls */
+ /* do the system call */
+ mov.l sp,er1
+ mov.l #__NR_clone,er0
trapa #0
+ add.l #20,sp
mov.l er0,er0
bmi __syscall_error
beq thread_start
@@ -62,7 +74,9 @@ __syscall_error:
thread_start:
mov.l @sp+,er0 /* restore args */
- jsr @er3
+ jsr @er3
mov.l er0,er1
mov.l #__NR_exit,er0
trapa #0
+
+ .end