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Make stack size computation more robust in patmos multi-core

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This commit is contained in:
afpr
2014-07-28 13:53:25 +01:00
parent f8c18e0c62
commit afa45150db
1 changed files with 11 additions and 8 deletions
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19
c/src/lib/libbsp/patmos/shared/startup/start.S
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@@ -68,16 +68,19 @@ SYM(hard_reset):
* Stack setup and RTEMS setup code need to be adapted when moving to multicore.
*/
li $r2 = _stack_cache_base
li $r3 = _shadow_stack_base
sub $r4 = $r3, $r2 /* stack_size = _shadow_stack_base - _stack_cache_base */
mul $r4, $r1 /* stack_size*cpu_id */
li $r2 = _shadow_stack_base
li $r3 = _stack_cache_base
sub $r4 = $r3, $r2 /* stack_size = _stack_cache_base - _shadow_stack_base */
cmplt $p1 = $r4, 0
neg $r6 = $r4
sl $r5 = $r4, 1 /* 2*stack_size */
($p1) sl $r5 = $r6, 1 /* make sure to have a positive size */
mul $r1, $r5 /* 2*stack_size*cpu_id */
nop
mfs $r1 = $s2
sl $r1 = $r1, 1 /* 2*stack_size*cpu_id */
sub $r3 = $r3, $r1
sub $r1 = $r2, $r1
mov $r31 = $r3 /* Initialize shadow stack pointer */
sub $r2 = $r2, $r1 /* _shadow_stack_base - 2*stack_size*id */
sub $r1 = $r3, $r1 /* _stack_cache_base - 2*stack_size*id */
mov $r31 = $r2 /* Initialize shadow stack pointer */
mts $s5 = $r1 /* Initialize the stack cache's top pointer */
mts $s6 = $r1 /* Initialize the stack cache's spill top pointer */