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132 lines
2.7 KiB
ArmAsm
132 lines
2.7 KiB
ArmAsm
/* Copyright (C) 1999-2013 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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<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 <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 <tcb-offsets.h>
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#endif
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
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pid_t *ptid, void *tls, pid_t *ctid); */
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.text
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ENTRY(__clone)
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/* sanity check arguments. */
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tst r4, r4
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bt/s 0f
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tst r5, r5
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bf 1f
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0:
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bra .Lsyscall_error
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mov #-EINVAL,r0
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1:
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/* insert the args onto the new stack */
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mov.l r7, @-r5
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/* save the function pointer as the 0th element */
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mov.l r4, @-r5
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/* do the system call */
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mov r6, r4
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mov.l @r15, r6
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mov.l @(8,r15), r7
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mov.l @(4,r15), r0
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mov #+SYS_ify(clone), r3
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trapa #0x15
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mov r0, r1
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mov #-12, r2
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shad r2, r1
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not r1, r1 // r1=0 means r0 = -1 to -4095
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tst r1, r1 // i.e. error in linux
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bf .Lclone_end
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.Lsyscall_error:
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SYSCALL_ERROR_HANDLER
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.Lclone_end:
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tst r0, r0
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bt 2f
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.Lpseudo_end:
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rts
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nop
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2:
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/* terminate the stack frame */
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mov #0, r14
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#ifdef RESET_PID
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mov r4, r0
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shlr16 r0
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tst #1, r0 // CLONE_THREAD = (1 << 16)
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bf/s 4f
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mov r4, r0
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/* new pid */
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shlr8 r0
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tst #1, r0 // CLONE_VM = (1 << 8)
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bf/s 3f
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mov #-1, r0
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mov #+SYS_ify(getpid), r3
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trapa #0x15
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3:
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stc gbr, r1
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mov.w .Lpidoff, r2
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add r1, r2
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mov.l r0, @r2
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mov.w .Ltidoff, r2
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add r1, r2
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mov.l r0, @r2
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4:
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#endif
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/* thread starts */
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mov.l @r15, r1
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jsr @r1
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mov.l @(4,r15), r4
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/* we are done, passing the return value through r0 */
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mov.l .L3, r1
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#ifdef SHARED
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mov.l r12, @-r15
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sts.l pr, @-r15
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mov r0, r4
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mova .LG, r0
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mov.l .LG, r12
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add r0, r12
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mova .L3, r0
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add r0, r1
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jsr @r1
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nop
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lds.l @r15+, pr
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rts
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mov.l @r15+, r12
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#else
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jmp @r1
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mov r0, r4
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#endif
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.align 2
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.LG:
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.long _GLOBAL_OFFSET_TABLE_
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.L3:
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.long PLTJMP(C_SYMBOL_NAME(_exit))
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#ifdef RESET_PID
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.Lpidoff:
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.word PID - TLS_PRE_TCB_SIZE
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.Ltidoff:
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.word TID - TLS_PRE_TCB_SIZE
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#endif
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PSEUDO_END (__clone)
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weak_alias (__clone, clone)
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