diff options
| author | Waldemar Brodkorb <wbx@openadk.org> | 2016-04-21 01:25:29 +0200 |
|---|---|---|
| committer | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2016-06-30 03:24:42 +0200 |
| commit | ee92c0fe5c1b9d59508273916e2c9a75b68dbc13 (patch) | |
| tree | 65a22258b12f84325910fc2ad47e2b02696ef593 /libc/sysdeps/linux/nds32/clone.S | |
| parent | dd46699e46decb7273f44dc2cbf307f096dc39e8 (diff) | |
nds32: add support for new architecture
Add support for Andes Technology NDS32 architecture.
See here http://www.andestech.com/en/index/index.htm for more
informaton. Verification of the port from an older uClibc
port was done on a sponsored AG101p board.
The testsuite only has 5 errors, three are related to
an existing bug in dlclose() with LT.old, also happening
on cris32 and m68k.
Failures to fallocate/posix_fallocate are unresolved.
Thanks to Andes Technology sponsoring the hardware and
being very helpful while doing the uClibc-ng porting.
Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
Diffstat (limited to 'libc/sysdeps/linux/nds32/clone.S')
| -rw-r--r-- | libc/sysdeps/linux/nds32/clone.S | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/nds32/clone.S b/libc/sysdeps/linux/nds32/clone.S new file mode 100644 index 000000000..5dba17896 --- /dev/null +++ b/libc/sysdeps/linux/nds32/clone.S @@ -0,0 +1,93 @@ +/* + * Copyright (C) 2016 Andes Technology, Inc. + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +/* 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> +#include <sys/syscall.h> +#define _ERRNO_H 1 +#include <bits/errno.h> + +/* + int clone(int (*fn)(void *), void *child_stack, int flags, void *arg); + _syscall2(int, clone, int, flags, void *, child_stack) +*/ + +ENTRY(__clone) +#ifdef PIC + /* set GP register to parent only, cause child's $SP will be $r1. */ + pushm $fp, $gp +#ifndef __NDS32_N1213_43U1H__ + mfusr $r15, $PC +#endif + sethi $gp, hi20(_GLOBAL_OFFSET_TABLE_+4) + ori $gp, $gp, lo12(_GLOBAL_OFFSET_TABLE_+8) + add $gp, $gp, $r15 +#endif + /* sanity check arguments. */ + beqz $r0, 1f + bnez $r1, 2f + +1: + movi $r0, -EINVAL +5: +#ifdef PIC + /* restore GP register, only in parent's stack */ + popm $fp, $gp + la $r15, C_SYMBOL_NAME(__syscall_error@PLT) + jr $r15 +#else + b C_SYMBOL_NAME(__syscall_error) +#endif + +2: + /* Child's $SP will be $r1, push to child's stack only. */ + addi $r1, $r1, -4 + swi.p $r3, [$r1], -4 ! arg + swi $r0, [$r1] ! fn + + /* do the system call */ + or $r0, $r2, $r2 ! move r0, r2 + __do_syscall(clone) + !syscall (__NR_clone) + beqz $r0, 4f + bltz $r0, 5b + + ! parent +#ifdef PIC + /* restore GP register, only in parent's stack */ + popm $fp, $gp +#endif + ret + +4: + /* Only in child's stack. */ + pop $r1 ! fn + pop $r0 ! arg +#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) +#else + addi $sp, $sp, -24 +#endif + ! use r15 in case _exit is PIC +#ifdef __NDS32_N1213_43U1H__ + or $r15, $r1, $r1 ! move r15, r2 +#endif + bral $r1 +#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) +#else + addi $sp, $sp, 24 +#endif + ! use r15 in case _exit is PIC +#ifdef PIC + la $r15, C_SYMBOL_NAME(_exit@PLT) + jr $r15 +#else + b C_SYMBOL_NAME(_exit) +#endif + + +PSEUDO_END (__clone) +weak_alias (__clone, clone) |