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https://github.com/brain-hackers/u-boot-brain
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9c46e71af2
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>
39 lines
810 B
ArmAsm
39 lines
810 B
ArmAsm
/*
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* interrupt.S - trampoline default exceptions/interrupts to C handlers
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*
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* Copyright (c) 2005-2007 Analog Devices Inc.
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* Licensed under the GPL-2 or later.
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*/
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#include <config.h>
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#include <asm/blackfin.h>
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#include <asm/entry.h>
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.text
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/* default entry point for exceptions */
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ENTRY(_trap)
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CONFIG_BFIN_SCRATCH_REG = sp;
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sp.l = LO(L1_SRAM_SCRATCH_END - 20);
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sp.h = HI(L1_SRAM_SCRATCH_END - 20);
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SAVE_ALL_SYS
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r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
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sp += -12;
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call _trap_c;
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sp += 12;
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RESTORE_ALL_SYS
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sp = CONFIG_BFIN_SCRATCH_REG;
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rtx;
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ENDPROC(_trap)
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/* default entry point for interrupts */
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ENTRY(_evt_default)
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SAVE_ALL_SYS
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r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
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sp += -12;
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call _bfin_panic;
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sp += 12;
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RESTORE_ALL_SYS
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rti;
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ENDPROC(_evt_default)
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