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90 lines
2.3 KiB
ArmAsm
90 lines
2.3 KiB
ArmAsm
/* clone helper __or1k_clone for OpenRISC.
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Copyright (C) 2022-2024 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include <tls.h>
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#define __ASSEMBLY__
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#include <linux/sched.h>
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.text
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ENTRY (__or1k_clone)
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/* To handle GCC varargs we need to use our __clone wrapper to pop
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everything from the stack for us.
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Now everything is placed in the registers which saves us a lot
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of trouble.
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The userland implementation is:
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int clone (int (*fn)(void *), void *child_stack,
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int flags, void *arg, pid_t *ptid,
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struct user_desc *tls, pid_t *ctid);
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The kernel entry is:
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int clone (long flags, void *child_stack, int *parent_tid,
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int *child_tid, struct void *tls)
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NB: tls isn't really an argument, it is read from r7 directly. */
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/* First, align the stack to 4 bytes. */
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l.xori r11, r0, -4
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l.and r4, r4, r11
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/* Put 'fn', 'arg' and 'flags' on the child stack. */
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l.addi r4, r4, -12
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l.sw 8(r4), r3
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l.sw 4(r4), r6
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l.sw 0(r4), r5
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l.ori r3, r5, 0
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/* The child_stack is already in r4. */
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l.ori r5, r7, 0
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l.lwz r6, 0(r1)
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l.ori r7, r8, 0
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DO_CALL (clone)
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l.sfgeui r11, 0xf001
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l.bf L(error)
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l.nop
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/* If we are not the child, return the pid. */
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l.sfeqi r11, 0
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l.bf L(thread_start)
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l.nop
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l.jr r9
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l.nop
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L(thread_start):
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/* Load function from stack. */
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l.lwz r11, 8(r1)
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l.jalr r11
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l.lwz r3, 4(r1)
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/* Exit the child thread. */
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l.ori r3, r11, 0
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DO_CALL (exit)
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L(error):
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l.j SYSCALL_ERROR_NAME
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l.ori r3, r11, 0
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END (__or1k_clone)
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