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u-boot/cpu/blackfin/interrupt.S

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Blackfin: unify cpu and boot modes All of the duplicated code for Blackfin processors and boot modes have been unified. After all, the core is the same for all processors, just the peripheral set differs (which gets handled in the drivers). Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2008-03-30 19:46:13 +00:00
/*
* interrupt.S - trampoline default exceptions/interrupts to C handlers
*
* Copyright (c) 2005-2007 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
Blackfin: use scratch pad for exception stack If the memory layout pushes the stack out of the default DCPLB coverage, the exception handler may trigger a double fault by trying to push onto the uncovered stack. So handle the exception stack similar to the kernel by using the top of the scratch pad SRAM. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-08-25 00:48:04 +00:00
#include <config.h>
Blackfin: unify cpu and boot modes All of the duplicated code for Blackfin processors and boot modes have been unified. After all, the core is the same for all processors, just the peripheral set differs (which gets handled in the drivers). Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2008-03-30 19:46:13 +00:00
#include <asm/blackfin.h>
#include <asm/entry.h>
.text
/* default entry point for exceptions */
ENTRY(_trap)
Blackfin: use scratch pad for exception stack If the memory layout pushes the stack out of the default DCPLB coverage, the exception handler may trigger a double fault by trying to push onto the uncovered stack. So handle the exception stack similar to the kernel by using the top of the scratch pad SRAM. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-08-25 00:48:04 +00:00
CONFIG_BFIN_SCRATCH_REG = sp;
sp.l = LO(L1_SRAM_SCRATCH_END - 20);
sp.h = HI(L1_SRAM_SCRATCH_END - 20);
Blackfin: unify cpu and boot modes All of the duplicated code for Blackfin processors and boot modes have been unified. After all, the core is the same for all processors, just the peripheral set differs (which gets handled in the drivers). Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2008-03-30 19:46:13 +00:00
SAVE_ALL_SYS
r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
sp += -12;
call _trap_c;
sp += 12;
RESTORE_ALL_SYS
Blackfin: use scratch pad for exception stack If the memory layout pushes the stack out of the default DCPLB coverage, the exception handler may trigger a double fault by trying to push onto the uncovered stack. So handle the exception stack similar to the kernel by using the top of the scratch pad SRAM. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-08-25 00:48:04 +00:00
sp = CONFIG_BFIN_SCRATCH_REG;
Blackfin: unify cpu and boot modes All of the duplicated code for Blackfin processors and boot modes have been unified. After all, the core is the same for all processors, just the peripheral set differs (which gets handled in the drivers). Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2008-03-30 19:46:13 +00:00
rtx;
ENDPROC(_trap)
/* default entry point for interrupts */
ENTRY(_evt_default)
SAVE_ALL_SYS
r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
sp += -12;
call _bfin_panic;
sp += 12;
RESTORE_ALL_SYS
rti;
ENDPROC(_evt_default)
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