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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 /sysdeps/unix/sysv/linux/tile/clone.S | |
parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
download | glibc-zack/build-layout-experiment.tar.gz glibc-zack/build-layout-experiment.tar.xz glibc-zack/build-layout-experiment.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 'sysdeps/unix/sysv/linux/tile/clone.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/tile/clone.S | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/sysdeps/unix/sysv/linux/tile/clone.S b/sysdeps/unix/sysv/linux/tile/clone.S deleted file mode 100644 index d7d2a3b968..0000000000 --- a/sysdeps/unix/sysv/linux/tile/clone.S +++ /dev/null @@ -1,178 +0,0 @@ -/* Copyright (C) 2011-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. - - 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 it's all over. */ - -#include <sysdep.h> -#define _ERRNO_H 1 -#include <bits/errno.h> - -#include <asm/unistd.h> -#include <arch/abi.h> -#include <tls.h> -#include <linux/sched.h> - -/* What we save where in the stack frame; must include all callee-saves. */ -#define FRAME_NEXT_LR (0 * REGSIZE) /* reserved by ABI; not used here */ -#define FRAME_SP (1 * REGSIZE) -#define FRAME_R30 (2 * REGSIZE) -#define FRAME_R31 (3 * REGSIZE) -#define FRAME_R32 (4 * REGSIZE) -#define FRAME_SIZE (5 * REGSIZE) - -/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, - pid_t *ptid, struct user_desc *tls, pid_t *ctid); */ - - .text -ENTRY (__clone) - /* Create a stack frame so we can pass callee-saves to new task. */ - { - move r10, sp - ST sp, lr - ADDI_PTR sp, sp, -FRAME_SIZE - } - cfi_offset (lr, 0) - cfi_def_cfa_offset (FRAME_SIZE) - ADDI_PTR r11, sp, FRAME_SP - { - ST r11, r10 - ADDI_PTR r11, sp, FRAME_R30 - } - { - ST r11, r30 - ADDI_PTR r11, sp, FRAME_R31 - } - cfi_offset (r30, FRAME_R30 - FRAME_SIZE) - { - ST r11, r31 - ADDI_PTR r11, sp, FRAME_R32 - } - cfi_offset (r31, FRAME_R31 - FRAME_SIZE) - ST r11, r32 - cfi_offset (r32, FRAME_R32 - FRAME_SIZE) - - /* sanity check arguments */ - BEQZ r0, .Linvalid - BEQZ r1, .Linvalid - - /* Make sure child stack is properly aligned, and set up the - top frame so that we can call out of it immediately in the - child. Setting it up here means we fault in the parent if - it's bogus, which is probably cleaner than faulting first - thing in the child. */ - ADDI_PTR r1, r1, -C_ABI_SAVE_AREA_SIZE - andi r1, r1, -C_ABI_SAVE_AREA_SIZE - ADDI_PTR r9, r1, REGSIZE /* sp of this frame on entry, i.e. zero */ - ST r9, zero - - /* We need to switch the argument convention around from - libc to kernel: - - libc: - r0 fn - r1 child_stack - r2 flags - r3 arg - r4 ptid - r5 tls - r6 ctid - - kernel: - r0 flags - r1 child_stack [same as libc] - r2 ptid - r3 ctid - r4 tls - - Plus the callee-saves as described at .Lthread_start, below. */ - { - move r32, r0 - move r0, r2 - } - { - move r31, r3 - move r3, r6 - } - { - move r30, r2 - move r2, r4 - } - { - move r4, r5 - moveli TREG_SYSCALL_NR_NAME, __NR_clone - } - swint1 - BEQZ r0, .Lthread_start /* If in child task. */ - -.Ldone: - /* Restore the callee-saved registers and return. */ - ADDLI_PTR lr, sp, FRAME_SIZE - { - LD lr, lr - ADDLI_PTR r30, sp, FRAME_R30 - } - { - LD r30, r30 - ADDLI_PTR r31, sp, FRAME_R31 - } - { - LD r31, r31 - ADDLI_PTR r32, sp, FRAME_R32 - } - { - LD r32, r32 - ADDI_PTR sp, sp, FRAME_SIZE - } - cfi_def_cfa_offset (0) - - BNEZ r1, .Lerror - jrp lr - -.Lerror: - j SYSCALL_ERROR_NAME - -.Linvalid: - { - movei r1, EINVAL - j .Ldone - } - -/* This function expects to receive: - - sp: the top of a valid stack area - r30: clone() flags - r31: the argument to pass to the user function - r32: the user function pointer */ - -.Lthread_start: - cfi_def_cfa_offset (FRAME_SIZE) - cfi_undefined (lr) - { - /* Invoke user function with specified argument. */ - move r0, r31 - jalr r32 - } - { - j HIDDEN_JUMPTARGET(_exit) - info INFO_OP_CANNOT_BACKTRACE /* Notify backtracer to stop. */ - } -PSEUDO_END (__clone) - -libc_hidden_def (__clone) -weak_alias (__clone, clone) |