aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/unix/sysv/linux/mips/clone.S
diff options
context:
space:
mode:
authorAndreas Jaeger <aj@suse.de>2000-02-10 11:10:03 +0000
committerAndreas Jaeger <aj@suse.de>2000-02-10 11:10:03 +0000
commit69151eeb8be58bb6854744a88411f4bc3aea485f (patch)
treeab23618c6722127899341b22dc5548925c4a27c9 /sysdeps/unix/sysv/linux/mips/clone.S
parent5a5b6a3aabb49f6cc7de23e5ba34226aade9f23b (diff)
downloadglibc-69151eeb8be58bb6854744a88411f4bc3aea485f.tar
glibc-69151eeb8be58bb6854744a88411f4bc3aea485f.tar.gz
glibc-69151eeb8be58bb6854744a88411f4bc3aea485f.tar.bz2
glibc-69151eeb8be58bb6854744a88411f4bc3aea485f.zip
Update.
2000-02-10 Andreas Jaeger <aj@suse.de> * sysdeps/unix/sysv/linux/mips/clone.S: Rewritten. Based on a patch by Hiroyuki Machida <machida@sm.sony.co.jp>.
Diffstat (limited to 'sysdeps/unix/sysv/linux/mips/clone.S')
-rw-r--r--sysdeps/unix/sysv/linux/mips/clone.S68
1 files changed, 32 insertions, 36 deletions
diff --git a/sysdeps/unix/sysv/linux/mips/clone.S b/sysdeps/unix/sysv/linux/mips/clone.S
index 4d6408dc97..30499bcf43 100644
--- a/sysdeps/unix/sysv/linux/mips/clone.S
+++ b/sysdeps/unix/sysv/linux/mips/clone.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>, 1996.
@@ -26,9 +26,9 @@
#define _ERRNO_H 1
#include <bits/errno.h>
-/* int clone(int (*fn)(), void *child_stack, int flags, int nargs, ...) */
+/* int clone(int (*fn)(), void *child_stack, int flags, void *arg) */
-#define FRAMESZ 4*SZREG
+#define FRAMESZ 8*SZREG
#if _MIPS_SIM == _MIPS_SIM_ABI32
#define MAX_REG_ARGS 4
#else
@@ -36,14 +36,16 @@
#endif
.text
-NESTED(__clone,4*SZREG,sp)
-#ifdef PIC
+NESTED(__clone,FRAMESZ,sp)
+#ifdef __PIC__
.set noreorder
.cpload $25
.set reorder
- .cprestore 16
-#endif
PTR_SUBIU sp,FRAMESZ
+ .cprestore SZREG*4
+#else
+ PTR_SUBIU sp,FRAMESZ
+#endif
#ifdef PROF
.set noat
move $1,ra
@@ -51,25 +53,20 @@ NESTED(__clone,4*SZREG,sp)
.set at
#endif
+ REG_S s0,FRAMESZ-SZREG*2(sp)
+ REG_S s1,FRAMESZ-SZREG*3(sp)
/* Sanity check arguments. */
li v0,EINVAL
beqz a0,error /* no NULL function pointers */
beqz a1,error /* no NULL stack pointers */
- bltz a3,error /* no negative argument counts */
/* Allocate space on the new stack and copy args over */
- move t0,a3 # save nargs for __thread_start
- PTR_SLL t1,a3,PTR_SCALESHIFT
- PTR_ADDU t1,a3,sp
-1: REG_L t2,-SZREG(t1)
- PTR_SUBIU t1,SZREG
- REG_S t2,-SZREG(a1)
- PTR_SUBIU a3,1
- PTR_SUBIU a1,SZREG
- bnez a3,1b
+ /* Save the arg for user's function */
+ move s0,a3 /* Save arg __thread_start. */
+ move s1,a0 /* Save func. pointer. */
+
/* Do the system call */
- move t9,a0 # get fn ptr out of the way
move a0,a2
li v0,__NR_clone
syscall
@@ -78,11 +75,15 @@ NESTED(__clone,4*SZREG,sp)
beqz v0,__thread_start
/* Successful return from the parent */
+ REG_L s0,FRAMESZ-SZREG*2(sp)
+ REG_L s1,FRAMESZ-SZREG*3(sp)
PTR_ADDIU sp,FRAMESZ
ret
/* Something bad happened -- no child created */
error:
+ REG_L s0,FRAMESZ-SZREG*2(sp)
+ REG_L s1,FRAMESZ-SZREG*3(sp)
PTR_ADDIU sp,FRAMESZ
#ifdef PIC
la t9,__syscall_error
@@ -96,30 +97,25 @@ error:
its own function so that we can terminate the stack trace with our
debug info.
- At this point we have t0=nargs, t9=fn, sp=&arg[0]. */
+ At this point we have s0=arg, s1=fn. */
-NESTED(__thread_start,32,sp)
- /* Stackframe has been created on entry of clone() */
- /* Calculate address of jump into argument loading code */
- li t1,MAX_REG_ARGS
- slt t0,t1,t2 /* max MAX_REG_ARGS args in registers */
- MOVN (t2,t1,t0)
- la v0,arg0
- PTR_SLL t1,t0,PTR_SCALESHIFT
- PTR_SUBU v0,t1
- jr v0
+NESTED(__thread_start,FRAMESZ,sp)
+ /* The stackframe has been created on entry of clone(). */
+ /* Resort the arg for user's function. */
+ move a0,s0
+ move t9,s1
- /* Load the integer register arguments */
- REG_L a0,SZREG(sp)
-arg0:
-
- /* Call the user's function */
+ /* Call the user's function. */
jalr t9
- /* Call _exit rather than doing it inline for breakpoint purposes */
+ /* Call _exit rather than doing it inline for breakpoint purposes. */
move a0,v0
+#ifdef __PIC__
+ la t9,_exit
+ jalr t9
+#else
jal _exit
-
+#endif
END(__thread_start)
weak_alias(__clone, clone)