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2ad7600be7
I've moved the MIPS port from ports to the main sysdeps hierarchy. Beyond the README update, the move of the files was simply git mv ports/sysdeps/mips sysdeps/mips git mv ports/sysdeps/unix/mips sysdeps/unix/mips git mv ports/sysdeps/unix/sysv/linux/mips sysdeps/unix/sysv/linux/mips and in addition to the ChangeLog entries here, I put a note at the top of ports/ChangeLog.mips similar to those in other files. Tested that disassembly of installed shared libraries for mips is the same before and after this patch (except for ld.so where paths in assertions are involved, as for arm). * sysdeps/mips: Move directory from ports/sysdeps/mips. * sysdeps/unix/mips: Move directory from ports/sysdeps/unix/mips. * sysdeps/unix/sysv/linux/mips: Move directory from ports/sysdeps/unix/sysv/linux/mips. * README: Update listing for mips-*-linux-gnu and mips64-*-linux-gnu. * sysdeps/mips: Move directory to ../sysdeps/mips. * sysdeps/unix/mips: Move directory to ../sysdeps/unix/mips. * sysdeps/unix/sysv/linux/mips: Move directory to ../sysdeps/unix/sysv/linux/mips.
178 lines
4.2 KiB
ArmAsm
178 lines
4.2 KiB
ArmAsm
/* Copyright (C) 1996-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ralf Baechle <ralf@linux-mips.org>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sys/asm.h>
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#ifdef RESET_PID
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#include <tls.h>
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#endif
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#define CLONE_VM 0x00000100
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#define CLONE_THREAD 0x00010000
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
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void *parent_tidptr, void *tls, void *child_tidptr) */
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.text
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.set nomips16
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#if _MIPS_SIM == _ABIO32
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# define EXTRA_LOCALS 1
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#else
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# define EXTRA_LOCALS 0
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#endif
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LOCALSZ= 4
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FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
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GPOFF= FRAMESZ-(1*SZREG)
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NESTED(__clone,4*SZREG,sp)
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#ifdef __PIC__
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SETUP_GP
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#endif
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PTR_SUBU sp, FRAMESZ
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cfi_adjust_cfa_offset (FRAMESZ)
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SETUP_GP64_STACK (GPOFF, __clone)
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#ifdef __PIC__
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SAVE_GP (GPOFF)
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#endif
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#ifdef PROF
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.set noat
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move $1,ra
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jal _mcount
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.set at
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#endif
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/* Sanity check arguments. */
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li v0,EINVAL
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beqz a0,L(error) /* No NULL function pointers. */
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beqz a1,L(error) /* No NULL stack pointers. */
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PTR_SUBU a1,32 /* Reserve argument save space. */
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PTR_S a0,0(a1) /* Save function pointer. */
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PTR_S a3,PTRSIZE(a1) /* Save argument pointer. */
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#ifdef RESET_PID
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LONG_S a2,(PTRSIZE*2)(a1) /* Save clone flags. */
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#endif
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move a0,a2
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/* Shuffle in the last three arguments - arguments 5, 6, and 7 to
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this function, but arguments 3, 4, and 5 to the syscall. */
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#if _MIPS_SIM == _ABIO32
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PTR_L a2,(FRAMESZ+PTRSIZE+PTRSIZE+16)(sp)
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PTR_S a2,16(sp)
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PTR_L a2,(FRAMESZ+16)(sp)
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PTR_L a3,(FRAMESZ+PTRSIZE+16)(sp)
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#else
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move a2,a4
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move a3,a5
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move a4,a6
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#endif
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/* Do the system call */
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li v0,__NR_clone
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cfi_endproc
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syscall
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bnez a3,L(error)
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beqz v0,L(thread_start)
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/* Successful return from the parent */
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cfi_startproc
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cfi_adjust_cfa_offset (FRAMESZ)
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SETUP_GP64_STACK_CFI (GPOFF)
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cfi_remember_state
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RESTORE_GP64_STACK
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PTR_ADDU sp, FRAMESZ
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cfi_adjust_cfa_offset (-FRAMESZ)
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ret
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/* Something bad happened -- no child created */
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L(error):
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cfi_restore_state
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#ifdef __PIC__
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PTR_LA t9,__syscall_error
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RESTORE_GP64_STACK
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PTR_ADDU sp, FRAMESZ
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cfi_adjust_cfa_offset (-FRAMESZ)
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jr t9
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#else
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RESTORE_GP64_STACK
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PTR_ADDU sp, FRAMESZ
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cfi_adjust_cfa_offset (-FRAMESZ)
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j __syscall_error
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#endif
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END(__clone)
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/* Load up the arguments to the function. Put this block of code in
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its own function so that we can terminate the stack trace with our
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debug info. */
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ENTRY(__thread_start)
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L(thread_start):
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cfi_undefined ($31)
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/* cp is already loaded. */
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SAVE_GP (GPOFF)
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/* The stackframe has been created on entry of clone(). */
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#ifdef RESET_PID
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/* Check and see if we need to reset the PID. */
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LONG_L a0,(PTRSIZE*2)(sp)
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and a1,a0,CLONE_THREAD
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beqz a1,L(restore_pid)
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L(donepid):
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#endif
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/* Restore the arg for user's function. */
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PTR_L t9,0(sp) /* Function pointer. */
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PTR_L a0,PTRSIZE(sp) /* Argument pointer. */
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/* Call the user's function. */
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jal t9
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/* Call _exit rather than doing it inline for breakpoint purposes. */
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move a0,v0
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#ifdef __PIC__
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PTR_LA t9,_exit
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jalr t9
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#else
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jal _exit
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#endif
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#ifdef RESET_PID
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L(restore_pid):
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and a1,a0,CLONE_VM
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li v0,-1
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bnez a1,L(gotpid)
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li v0,__NR_getpid
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syscall
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L(gotpid):
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READ_THREAD_POINTER(v1)
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INT_S v0,PID_OFFSET(v1)
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INT_S v0,TID_OFFSET(v1)
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b L(donepid)
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#endif
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END(__thread_start)
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weak_alias (__clone, clone)
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