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microblaze: Add TLS support to sys_clone

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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: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: David Holsgrove <david.holsgrove@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Edgar E. Iglesias 2012-02-24 14:52:26 +10:00 committed by Michal Simek
parent d65987a88d
commit 8d95e1224a
1 changed files with 4 additions and 3 deletions
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7
arch/microblaze/kernel/entry.S
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@ -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).*/