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Commit 8d95e122 authored by Edgar E. Iglesias's avatar Edgar E. Iglesias Committed by Michal Simek
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microblaze: Add TLS support to sys_clone 



Formerly unused Args 4/5 now load parent tid / child tid so the brid to
do_fork can pick up TLS from r10. Arg 3 still unused

There is also necessary to fix old glibc which do not setup r9/r10 (arg 4/5).
Simple clearing them is fine.

Signed-off-by: default avatarEdgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: default avatarDavid Holsgrove <david.holsgrove@petalogix.com>
Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
parent d65987a8

arch/microblaze/kernel/entry.S

+4 −3
Original line number Diff line number Diff line
@@ -493,10 +493,11 @@ C_ENTRY(sys_clone): 
	bnei	r6, 1f;			/* See if child SP arg (arg 1) is 0. */

	lwi	r6, r1, PT_R1;	/* If so, use paret's stack ptr */

1:	addik	r7, r1, 0;			/* Arg 2: parent context */

	add	r8, r0, r0;			/* Arg 3: (unused) */

	add	r9, r0, r0;			/* Arg 4: (unused) */

	lwi     r9, r1, PT_R8;          /* parent tid.  */

	lwi     r10, r1, PT_R9;         /* child tid.  */

	/* do_fork will pick up TLS from regs->r10.  */

	brid	do_fork		/* Do real work (tail-call) */

	add	r10, r0, r0;			/* Arg 5: (unused) */

	add     r8, r0, r0;             /* Arg 3: (unused) */



C_ENTRY(sys_execve):

	brid	microblaze_execve;	/* Do real work (tail-call).*/