[glibc/release/2.34/master] mips: align stack in clone [BZ #28223]

[Aurelien Jarno]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7af07fe795f43e53d31be1c6f9adba7e05f87b0b

commit 7af07fe795f43e53d31be1c6f9adba7e05f87b0b
Author: Xi Ruoyao <xry111@mengyan1223.wang>
Date:   Thu Aug 12 20:31:59 2021 +0000

    mips: align stack in clone [BZ #28223]
    
    The MIPS O32 ABI requires 4 byte aligned stack, and the MIPS N64 and N32
    ABI require 8 byte aligned stack.  Previously if the caller passed an
    unaligned stack to clone the the child misbehaved.
    
    Fixes bug 28223.
    
    (cherry picked from commit 1f51cd9a860ee45eee8a56fb2ba925267a2a7bfe)

Diff:
---
 NEWS                                 | 1 +
 sysdeps/unix/sysv/linux/mips/clone.S | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/NEWS b/NEWS
index 698964bb9e..693ac78229 100644
--- a/NEWS
+++ b/NEWS
@@ -13,6 +13,7 @@ The following bugs are resolved with this release:
   [19193] nptl: pthread_kill, pthread_cancel should not fail after exit
   [28036] Incorrect types for pthread_mutexattr_set/getrobust_np
   [28182] _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
+  [28223] mips: clone does not align stack
   [28310] Do not use affinity mask for sysconf (_SC_NPROCESSORS_CONF)
   [28340] ld.so crashes while loading a DSO with a read-only dynamic section
   [28357] deadlock between pthread_create and ELF constructors
diff --git a/sysdeps/unix/sysv/linux/mips/clone.S b/sysdeps/unix/sysv/linux/mips/clone.S
index 71d9dba8bd..43a5ad3a40 100644
--- a/sysdeps/unix/sysv/linux/mips/clone.S
+++ b/sysdeps/unix/sysv/linux/mips/clone.S
@@ -55,6 +55,13 @@ NESTED(__clone,4*SZREG,sp)
 	.set		at
 #endif
 
+	/* Align stack to 4/8 bytes per the ABI.  */
+#if _MIPS_SIM == _ABIO32
+	li		t0,-4
+#else
+	li		t0,-8
+#endif
+	and		a1,a1,t0
 
 	/* Sanity check arguments.  */
 	li		v0,EINVAL