AcoSail/kernel_optimize_test
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Blackfin: fix initial stack pointer setup

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During very early init, the stack pointer is given a slightly incorrect
value (&init_thread_union).  The value is later adjusted to the right one
during early init (&init_thread_union + THREAD_SIZE), but it is used a few
times in between.  While the few functions used don't actually put things
onto the stack (due to optimization), it's best if we simply use the right
value from the start.

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Barry Song 2010-01-05 07:25:24 +00:00 committed by Mike Frysinger
parent 8916a1499d
commit aad16f3228
1 changed files with 3 additions and 8 deletions
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11
arch/blackfin/mach-common/head.S
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@ -144,8 +144,8 @@ ENTRY(__start)
#endif
/* Initialize stack pointer */
sp.l = _init_thread_union;
sp.h = _init_thread_union;
sp.l = _init_thread_union + THREAD_SIZE;
sp.h = _init_thread_union + THREAD_SIZE;
fp = sp;
usp = sp;
@ -257,12 +257,7 @@ ENTRY(_real_start)
R0 = R7;
call _cmdline_init;
/* Load the current thread pointer and stack */
p1 = THREAD_SIZE + 4 (z); /* +4 is for reti loading */
sp = sp + p1;
usp = sp;
fp = sp;
sp += -12;
sp += -12 + 4; /* +4 is for reti loading above */
call _init_pda
sp += 12;
jump.l _start_kernel;