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author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
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committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /REORG.TODO/sysdeps/unix/sysv/linux/sh/clone.S | |
parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
download | glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.gz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.xz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.zip |
Prepare for radical source tree reorganization. zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control).
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/sh/clone.S')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/sh/clone.S | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/sh/clone.S b/REORG.TODO/sysdeps/unix/sysv/linux/sh/clone.S new file mode 100644 index 0000000000..9063b21928 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/sh/clone.S @@ -0,0 +1,103 @@ +/* Copyright (C) 1999-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +/* clone() is even more special than fork() as it mucks with stacks + and invokes a function in the right context after its all over. */ + +#include <sysdep.h> +#define _ERRNO_H 1 +#include <bits/errno.h> +#include <tcb-offsets.h> + +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, + pid_t *ptid, void *tls, pid_t *ctid); */ + + .text +ENTRY(__clone) + /* sanity check arguments. */ + tst r4, r4 + bt/s 0f + tst r5, r5 + bf 1f +0: + bra .Lsyscall_error + mov #-EINVAL,r0 +1: + /* insert the args onto the new stack */ + mov.l r7, @-r5 + /* save the function pointer as the 0th element */ + mov.l r4, @-r5 + + /* do the system call */ + mov r6, r4 + mov.l @r15, r6 + mov.l @(8,r15), r7 + mov.l @(4,r15), r0 + mov #+SYS_ify(clone), r3 + trapa #0x15 + mov r0, r1 + mov #-12, r2 + shad r2, r1 + not r1, r1 // r1=0 means r0 = -1 to -4095 + tst r1, r1 // i.e. error in linux + bf .Lclone_end +.Lsyscall_error: + SYSCALL_ERROR_HANDLER +.Lclone_end: + tst r0, r0 + bt 2f +.Lpseudo_end: + rts + nop +2: + /* terminate the stack frame */ + mov #0, r14 + + /* thread starts */ + mov.l @r15, r1 + jsr @r1 + mov.l @(4,r15), r4 + + /* we are done, passing the return value through r0 */ + mov.l .L3, r1 +#ifdef SHARED + mov.l r12, @-r15 + sts.l pr, @-r15 + mov r0, r4 + mova .LG, r0 + mov.l .LG, r12 + add r0, r12 + mova .L3, r0 + add r0, r1 + jsr @r1 + nop + lds.l @r15+, pr + rts + mov.l @r15+, r12 +#else + jmp @r1 + mov r0, r4 +#endif + .align 2 +.LG: + .long _GLOBAL_OFFSET_TABLE_ +.L3: + .long PLTJMP(C_SYMBOL_NAME(_exit)) +PSEUDO_END (__clone) + +libc_hidden_def (__clone) +weak_alias (__clone, clone) |