diff options
Diffstat (limited to 'libc/sysdeps/linux/m68k/clone.S')
| -rw-r--r-- | libc/sysdeps/linux/m68k/clone.S | 108 |
1 files changed, 78 insertions, 30 deletions
diff --git a/libc/sysdeps/linux/m68k/clone.S b/libc/sysdeps/linux/m68k/clone.S index 7eddff10c..24071235b 100644 --- a/libc/sysdeps/linux/m68k/clone.S +++ b/libc/sysdeps/linux/m68k/clone.S @@ -1,54 +1,94 @@ -/* Adapted from glibc */ -/* Copyright (C) 1996, 1997 Free Software Foundation, Inc. */ +/* Copyright (C) 1996-2017 Free Software Foundation, Inc. + Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de) + + 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. */ #define _ERRNO_H +#include <sysdep.h> #include <features.h> #include <bits/errno.h> #include <sys/syscall.h> #include "m68k_pic.S" -/* int _clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, + void *parent_tidptr, void *tls, void *child_tidptr) */ -.text -.align 4 -.type clone,@function -.globl clone; -clone: + .text + .align 4 + .globl __clone + .type __clone,@function + +__clone: /* Sanity check arguments. */ - movel #-EINVAL, %d0 - movel 4(%sp), %d1 /* no NULL function pointers */ - movel %d1, %a0 - tstl %d1 + movel #-EINVAL, %d0 + movel 4(%sp), %a0 /* no NULL function pointers */ + tstl %a0 beq.w __syscall_error_trampoline - movel 8(%sp), %d1 /* no NULL stack pointers */ - movel %d1, %a1 - tstl %d1 + movel 8(%sp), %a1 /* no NULL stack pointers */ + tstl %a1 beq.w __syscall_error_trampoline /* Allocate space and copy the argument onto the new stack. */ movel 16(%sp), -(%a1) /* Do the system call */ -#if 1 /* defined (CONFIG_COLDFIRE) */ - movel %d2, %d1 /* save %d2 and get stack pointer */ - movel %a1, %d2 - movel %d1, %a1 + movel 12(%sp), %d1 /* get flags */ + movel %d3, -(%a1) /* save %d3 and get parent_tidptr */ + movel %d3, -(%sp) + cfi_adjust_cfa_offset (4) + cfi_rel_offset (%d3, 0) + movel 20+4(%sp), %d3 + movel %d4, -(%a1) /* save %d4 and get child_tidptr */ + movel %d4, -(%sp) + cfi_adjust_cfa_offset (4) + cfi_rel_offset (%d4, 0) + movel 28+8(%sp), %d4 + movel %d5, -(%a1) /* save %d5 and get tls */ + movel %d5, -(%sp) + cfi_adjust_cfa_offset (4) + cfi_rel_offset (%d5, 0) + movel 24+12(%sp), %d5 + /* save %d2 and get stack pointer */ +#ifdef __mcoldfire__ + movel %d2, -(%a1) + movel %d2, -(%sp) + cfi_adjust_cfa_offset (4) + cfi_rel_offset (%d2, 0) + movel %a1, %d2 #else - exg %d2, %a1 /* save %d2 and get stack pointer */ + exg %d2, %a1 /* save %d2 and get stack pointer */ + cfi_register (%d2, %a1) #endif - movel 12(%sp), %d1 /* get flags */ movel #__NR_clone, %d0 + + /* End FDE now, because in the child the unwind info will be + wrong. */ + cfi_endproc + trap #0 -#if 1 /* defined (CONFIG_COLDFIRE) */ - movel %d2, %d1 /* restore %d2 */ - movel %a1, %d2 - movel %d1, %a1 +#ifdef __mcoldfire__ + movel (%sp)+, %d2 #else - exg %d2, %a1 /* restore %d2 */ + exg %d2, %a1 /* restore %d2 */ #endif + movel (%sp)+, %d5 /* restore %d5, %d4 and %d3 */ + movel (%sp)+, %d4 + movel (%sp)+, %d3 tstl %d0 bmi.w __syscall_error_trampoline @@ -57,13 +97,21 @@ clone: rts thread_start: - /*subl %fp, %fp*/ /* terminate the stack frame */ - jsr (%a0) - movel %d0, -(%sp) + cfi_startproc + cfi_undefined (pc) /* Mark end of stack */ + subl %fp, %fp /* terminate the stack frame */ + jsr (%a0) + movel %d0, %d1 movel #__NR_exit, %d0 trap #0 - /*jsr exit*/ + cfi_endproc + + cfi_startproc __syscall_error_trampoline: JUMP __syscall_error,%a0 +.size __clone,.-__clone + +weak_alias(__clone,clone) +libc_hidden_def(clone) |