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Add NPTL and five-argument clone support.

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This commit is contained in:
Andreas Jaeger 2005-03-28 09:17:06 +00:00
parent 4abf7dea27
commit 08650996ea
1 changed files with 56 additions and 4 deletions
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60
sysdeps/unix/sysv/linux/mips/clone.S
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@ -1,4 +1,4 @@
/* Copyright (C) 1996, 1997, 2000, 2003 Free Software Foundation, Inc.
/* Copyright (C) 1996, 1997, 2000, 2003, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ralf Baechle <ralf@linux-mips.org>, 1996.
@ -24,11 +24,23 @@
#include <sysdep.h>
#define _ERRNO_H 1
#include <bits/errno.h>
#ifdef RESET_PID
#include <tls.h>
#endif
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
#define CLONE_VM 0x00000100
#define CLONE_THREAD 0x00010000
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
void *parent_tidptr, void *tls, void *child_tidptr) */
.text
LOCALSZ= 1
#if _MIPS_SIM == _ABIO32
# define EXTRA_LOCALS 1
#else
# define EXTRA_LOCALS 0
#endif
LOCALSZ= 4
FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
GPOFF= FRAMESZ-(1*SZREG)
NESTED(__clone,4*SZREG,sp)
@ -56,10 +68,26 @@ NESTED(__clone,4*SZREG,sp)
PTR_SUBU a1,32 /* Reserve argument save space. */
PTR_S a0,0(a1) /* Save function pointer. */
PTR_S a3,PTRSIZE(a1) /* Save argument pointer. */
#ifdef RESET_PID
LONG_S a2,(PTRSIZE*2)(a1) /* Save clone flags. */
#endif
move a0,a2
/* Shuffle in the last three arguments - arguments 5, 6, and 7 to
this function, but arguments 3, 4, and 5 to the syscall. */
#if _MIPS_SIM == _ABIO32
PTR_L a2,(FRAMESZ+PTRSIZE+PTRSIZE+16)(sp)
PTR_S a2,16(sp)
PTR_L a2,(FRAMESZ+16)(sp)
PTR_L a3,(FRAMESZ+PTRSIZE+16)(sp)
#else
move a2,a4
move a3,a5
move a4,a6
#endif
/* Do the system call */
move a0,a2
li v0,__NR_clone
syscall
@ -94,6 +122,15 @@ L(thread_start):
/* cp is already loaded. */
SAVE_GP (GPOFF)
/* The stackframe has been created on entry of clone(). */
#ifdef RESET_PID
/* Check and see if we need to reset the PID. */
LONG_L a0,(PTRSIZE*2)(sp)
and a1,a0,CLONE_THREAD
beqz a1,L(restore_pid)
L(donepid):
#endif
/* Restore the arg for user's function. */
PTR_L t9,0(sp) /* Function pointer. */
PTR_L a0,PTRSIZE(sp) /* Argument pointer. */
@ -109,6 +146,21 @@ L(thread_start):
#else
jal _exit
#endif
#ifdef RESET_PID
L(restore_pid):
and a1,a0,CLONE_VM
li v0,-1
bnez a1,L(gotpid)
li v0,__NR_getpid
syscall
L(gotpid):
READ_THREAD_POINTER(v1)
INT_S v0,PID_OFFSET(v1)
INT_S v0,TID_OFFSET(v1)
b L(donepid)
#endif
END(__thread_start)
weak_alias(__clone, clone)