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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
151 lines
3.7 KiB
ArmAsm
151 lines
3.7 KiB
ArmAsm
/* Copyright (C) 1996-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://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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#include <tls.h>
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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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/* Align stack to 8/16 bytes per the ABI. */
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#if _MIPS_SIM == _ABIO32
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li t0,-8
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#else
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li t0,-16
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#endif
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and a1,a1,t0
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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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LONG_S a2,(PTRSIZE*2)(a1) /* Save clone flags. */
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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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/* 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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move a0,v0
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li v0,__NR_exit
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syscall
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END(__thread_start)
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libc_hidden_def (__clone)
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weak_alias (__clone, clone)
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