0893f1250f
When transferring to IRQ5 from an exception, save SYSCFG in memory across the transfer and clear the trace bit. When we get a single step exception, check whether we can safely clear the trace bit in SYSCFG. We can (and should) clear it after the first instruction of the interrupt handler; the first insn saves SYSCFG to the stack in all handlers. Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: Bryan Wu <cooloney@kernel.org>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
#ifndef __BFIN_ENTRY_H
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#define __BFIN_ENTRY_H
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#include <asm/setup.h>
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#include <asm/page.h>
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#ifdef __ASSEMBLY__
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#define LFLUSH_I_AND_D 0x00000808
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#define LSIGTRAP 5
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/* process bits for task_struct.flags */
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#define PF_TRACESYS_OFF 3
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#define PF_TRACESYS_BIT 5
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#define PF_PTRACED_OFF 3
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#define PF_PTRACED_BIT 4
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#define PF_DTRACE_OFF 1
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#define PF_DTRACE_BIT 5
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/*
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* NOTE! The single-stepping code assumes that all interrupt handlers
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* start by saving SYSCFG on the stack with their first instruction.
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*/
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/* This one is used for exceptions, emulation, and NMI. It doesn't push
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RETI and doesn't do cli. */
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#define SAVE_ALL_SYS save_context_no_interrupts
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/* This is used for all normal interrupts. It saves a minimum of registers
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to the stack, loads the IRQ number, and jumps to common code. */
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#define INTERRUPT_ENTRY(N) \
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[--sp] = SYSCFG; \
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\
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[--sp] = P0; /*orig_p0*/ \
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[--sp] = R0; /*orig_r0*/ \
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[--sp] = (R7:0,P5:0); \
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R0 = (N); \
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jump __common_int_entry;
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/* For timer interrupts, we need to save IPEND, since the user_mode
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macro accesses it to determine where to account time. */
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#define TIMER_INTERRUPT_ENTRY(N) \
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[--sp] = SYSCFG; \
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\
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[--sp] = P0; /*orig_p0*/ \
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[--sp] = R0; /*orig_r0*/ \
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[--sp] = (R7:0,P5:0); \
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p0.l = lo(IPEND); \
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p0.h = hi(IPEND); \
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r1 = [p0]; \
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R0 = (N); \
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jump __common_int_entry;
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/* This one pushes RETI without using CLI. Interrupts are enabled. */
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#define SAVE_CONTEXT_SYSCALL save_context_syscall
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#define SAVE_CONTEXT save_context_with_interrupts
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#define RESTORE_ALL_SYS restore_context_no_interrupts
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#define RESTORE_CONTEXT restore_context_with_interrupts
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#endif /* __ASSEMBLY__ */
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#endif /* __BFIN_ENTRY_H */
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