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* spu/sbrk.c (sbrk): Adjust the stack pointer vector correctly so

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that GCC runtime stack checking works.  Handle the backchain, too.
This commit is contained in:
Ben Elliston 2007-03-01 23:08:21 +00:00
parent e943a1a37e
commit 538b71077d
2 changed files with 33 additions and 8 deletions
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5
libgloss/ChangeLog
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@ -1,3 +1,8 @@
2007-03-01 Ben Elliston <bje@au.ibm.com>
* spu/sbrk.c (sbrk): Adjust the stack pointer vector correctly so
that GCC runtime stack checking works. Handle the backchain, too.
2007-02-21 Patrick Mansfield <patmans@us.ibm.com> 2007-02-21 Patrick Mansfield <patmans@us.ibm.com>
* spu/gettimeofday.c: New file which adds SPU gettimeofday. * spu/gettimeofday.c: New file which adds SPU gettimeofday.

36
libgloss/spu/sbrk.c
View File

@ -32,6 +32,7 @@ Author: Andreas Neukoetter (ti95neuk@de.ibm.com)
#include <sys/types.h> #include <sys/types.h>
#include <errno.h> #include <errno.h>
#include <spu_intrinsics.h>
extern int errno; extern int errno;
@ -44,20 +45,39 @@ sbrk (ptrdiff_t increment)
{ {
static caddr_t heap_ptr = NULL; static caddr_t heap_ptr = NULL;
caddr_t base; caddr_t base;
vector unsigned int sp_reg, sp_delta;
vector unsigned int *sp_ptr;
/* The stack pointer register. */
volatile register vector unsigned int sp_r1 __asm__("1");
if (heap_ptr == NULL) if (heap_ptr == NULL)
{ heap_ptr = (caddr_t) & _end;
heap_ptr = (caddr_t) & _end;
}
if (((RAMSIZE - STACKSIZE) - (int) heap_ptr) >= increment) if (((RAMSIZE - STACKSIZE) - (int) heap_ptr) >= increment)
{ {
base = heap_ptr; base = heap_ptr;
heap_ptr += increment; heap_ptr += increment;
return (base);
sp_delta = (vector unsigned int) spu_insert (increment, spu_splats (0), 1);
/* Subtract sp_delta from the SP limit (word 1). */
sp_r1 = spu_sub (sp_r1, sp_delta);
/* Fix-up backchain. */
sp_ptr = (vector unsigned int *) spu_extract (sp_r1, 0);
do
{
sp_reg = *sp_ptr;
*sp_ptr = (vector unsigned int) spu_sub (sp_reg, sp_delta);
}
while ((sp_ptr = (vector unsigned int *) spu_extract (sp_reg, 0)));
return (base);
} }
else else
{ {
errno = ENOMEM; errno = ENOMEM;
return ((void *) -1); return ((void *) -1);
} }
} }