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microblaze: Fix sys_clone syscall 

sys_clone syscall ignored args which this patch mapped to args
which are passing from glibc.

Here is the origin problem description.

"I ran the static libgcc tests (very few of them are there, they are
mostly dynamically linked) and some of  them fail with an assertion in
fork() system call (tid != pid), I looked at the microblaze/entry.S
file and it looks suspicious (ignores arguments 3-5)"

Arg mapping should be:
glibc ARCH_FORK(...) -> do_fork(...)
r5 -> r5   (clone_flags)
r6  -> r6 (stack_start, use parent->stack if NULL)
pt_regs -> r7 (pt_regs)
r7 -> r8 (stack_size)
r8 -> r9 (parent_tidptr)
r9 -> r10 (child_tidptr)

Signed-off-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2010-06-04 13:06:27 +02:00
parent 79aac88903
commit 570e3e236e
1 changed files with 7 additions and 7 deletions
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14
arch/microblaze/kernel/entry.S
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@ -476,13 +476,13 @@ C_ENTRY(sys_vfork):
C_ENTRY(sys_clone):
bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */
lwi r6, r1, PTO+PT_R1; /* If so, use paret's stack ptr */
1: la r7, r1, PTO; /* Arg 2: parent context */
add r8, r0, r0; /* Arg 3: (unused) */
add r9, r0, r0; /* Arg 4: (unused) */
add r10, r0, r0; /* Arg 5: (unused) */
brid do_fork /* Do real work (tail-call) */
nop;
lwi r6, r1, PTO + PT_R1; /* If so, use paret's stack ptr */
1: add r10, r0, r9; /* Arg 6: (child_tidptr) */
add r9, r0, r8; /* Arg 5: (parent_tidptr) */
add r8, r0, r7; /* Arg 4: (stack_size) */
la r7, r1, PTO; /* Arg 3: pt_regs */
brid do_fork /* Do real work (tail-call) */
nop
C_ENTRY(sys_execve):
la r8, r1, PTO; /* add user context as 4th arg */