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Re: [PATCH v3] Fix clone (CLONE_VM) pid/tid reset (BZ#19957)


Adhemerval Zanella <adhemerval.zanella@linaro.org> writes:

> diff --git a/sysdeps/unix/sysv/linux/m68k/clone.S b/sysdeps/unix/sysv/linux/m68k/clone.S
> index 33474cc..84eb2b9 100644
> --- a/sysdeps/unix/sysv/linux/m68k/clone.S
> +++ b/sysdeps/unix/sysv/linux/m68k/clone.S
> @@ -25,7 +25,6 @@
>  #include <tls.h>
>  
>  #define CLONE_VM      0x00000100
> -#define CLONE_THREAD  0x00010000
>  
>  /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
>  	     void *parent_tidptr, void *tls, void *child_tidptr) */
> @@ -101,12 +100,9 @@ thread_start:
>  	subl	%fp, %fp	/* terminate the stack frame */
>  	/* Check and see if we need to reset the PID.  */
>  	movel	%d1, %a1
> -	andl	#CLONE_THREAD, %d1
> +	andl	#CLONE_VM, %d1
>  	jne	donepid
>  	movel	%a1, %d1
> -	movel	#-1, %d0
> -	andl	#CLONE_VM, %d1
> -	jne	gotpid
>  	movel	#SYS_ify (getpid), %d0
>  	trap	#0
>  gotpid:

This can be simplified further:

diff --git a/sysdeps/unix/sysv/linux/m68k/clone.S b/sysdeps/unix/sysv/linux/m68k/clone.S
index 33474cc..aec12cb 100644
--- a/sysdeps/unix/sysv/linux/m68k/clone.S
+++ b/sysdeps/unix/sysv/linux/m68k/clone.S
@@ -25,7 +25,6 @@
 #include <tls.h>
 
 #define CLONE_VM      0x00000100
-#define CLONE_THREAD  0x00010000
 
 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
 	     void *parent_tidptr, void *tls, void *child_tidptr) */
@@ -100,16 +99,10 @@ thread_start:
 	cfi_undefined (pc)	/* Mark end of stack */
 	subl	%fp, %fp	/* terminate the stack frame */
 	/* Check and see if we need to reset the PID.  */
-	movel	%d1, %a1
-	andl	#CLONE_THREAD, %d1
-	jne	donepid
-	movel	%a1, %d1
-	movel	#-1, %d0
 	andl	#CLONE_VM, %d1
-	jne	gotpid
+	jne	donepid
 	movel	#SYS_ify (getpid), %d0
 	trap	#0
-gotpid:
 	movel	%a0, -(%sp)
 	movel	%d0, -(%sp)
 	bsrl	__m68k_read_tp@PLTPC


Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."


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