diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/tile/clone.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/tile/clone.S | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/sysdeps/unix/sysv/linux/tile/clone.S b/sysdeps/unix/sysv/linux/tile/clone.S deleted file mode 100644 index 02fe3a8670..0000000000 --- a/sysdeps/unix/sysv/linux/tile/clone.S +++ /dev/null @@ -1,222 +0,0 @@ -/* Copyright (C) 2011-2016 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) - /* Check and see if we need to reset the PID, which we do if - CLONE_THREAD isn't set, i.e. we're not staying in the thread group. - If CLONE_VM is set, we're doing some kind of thread-like clone, - so we set the tid/pid to -1 to disable using the cached values - in getpid(). Otherwise (if CLONE_VM isn't set), it's a - fork-like clone, and we go ahead and write the cached values - from the true system pid (retrieved via __NR_getpid syscall). */ -#ifdef __tilegx__ - { - moveli r0, hw1_last(CLONE_VM) - moveli r1, hw1_last(CLONE_THREAD) - } - { - shl16insli r0, r0, hw0(CLONE_VM) - shl16insli r1, r1, hw0(CLONE_THREAD) - } -#else - { - moveli r0, lo16(CLONE_VM) - moveli r1, lo16(CLONE_THREAD) - } - { - auli r0, r0, ha16(CLONE_VM) - auli r1, r1, ha16(CLONE_THREAD) - } -#endif - { - and r0, r30, r0 - and r1, r30, r1 - } - BNEZ r1, .Lno_reset_pid /* CLONE_THREAD is set */ - { - movei r0, -1 - BNEZ r0, .Lgotpid /* CLONE_VM is set */ - } - moveli TREG_SYSCALL_NR_NAME, __NR_getpid - swint1 -.Lgotpid: - ADDLI_PTR r2, tp, PID_OFFSET - { - ST4 r2, r0 - ADDLI_PTR r2, tp, TID_OFFSET - } - ST4 r2, r0 -.Lno_reset_pid: - { - /* 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) - -weak_alias (__clone, clone) |