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2000-02-10 Andreas Jaeger <aj@suse.de>

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* sysdeps/unix/sysv/linux/mips/clone.S: Rewritten.
	Based on a patch by Hiroyuki Machida <machida@sm.sony.co.jp>.
This commit is contained in:
Andreas Jaeger 2000-02-10 11:09:31 +00:00
parent b7393d1c58
commit a233bb29c8
1 changed files with 32 additions and 36 deletions
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68
sysdeps/unix/sysv/linux/mips/clone.S
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@ -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)