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| author | Edgar E. Iglesias <edgar.iglesias@gmail.com> | 2012-02-24 05:52:26 +0100 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2012-05-25 06:40:23 +0200 |
| commit | 8d95e1224afa22e7881fc823849342b5602d736e (patch) | |
| tree | 20663d437e1df665ed06ebb934801fb0405c2c06 /arch/microblaze | |
| parent | microblaze: ftrace: Pass the first calling instruction for dynamic ftrace (diff) | |
| download | linux-8d95e1224afa22e7881fc823849342b5602d736e.tar.xz linux-8d95e1224afa22e7881fc823849342b5602d736e.zip | |
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: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: David Holsgrove <david.holsgrove@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
| -rw-r--r-- | arch/microblaze/kernel/entry.S | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S index 66e34a3bfe1b..288678c5fea6 100644 --- a/arch/microblaze/kernel/entry.S +++ b/arch/microblaze/kernel/entry.S @@ -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).*/ |