linux/include/asm-blackfin/entry.h
Bernd Schmidt 0893f1250f [Blackfin] arch: fix gdb testing regression
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>
2008-05-07 11:41:26 +08:00

62 lines
1.8 KiB
C

#ifndef __BFIN_ENTRY_H
#define __BFIN_ENTRY_H
#include <asm/setup.h>
#include <asm/page.h>
#ifdef __ASSEMBLY__
#define LFLUSH_I_AND_D 0x00000808
#define LSIGTRAP 5
/* process bits for task_struct.flags */
#define PF_TRACESYS_OFF 3
#define PF_TRACESYS_BIT 5
#define PF_PTRACED_OFF 3
#define PF_PTRACED_BIT 4
#define PF_DTRACE_OFF 1
#define PF_DTRACE_BIT 5
/*
* NOTE! The single-stepping code assumes that all interrupt handlers
* start by saving SYSCFG on the stack with their first instruction.
*/
/* This one is used for exceptions, emulation, and NMI. It doesn't push
RETI and doesn't do cli. */
#define SAVE_ALL_SYS save_context_no_interrupts
/* This is used for all normal interrupts. It saves a minimum of registers
to the stack, loads the IRQ number, and jumps to common code. */
#define INTERRUPT_ENTRY(N) \
[--sp] = SYSCFG; \
\
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
R0 = (N); \
jump __common_int_entry;
/* For timer interrupts, we need to save IPEND, since the user_mode
macro accesses it to determine where to account time. */
#define TIMER_INTERRUPT_ENTRY(N) \
[--sp] = SYSCFG; \
\
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
p0.l = lo(IPEND); \
p0.h = hi(IPEND); \
r1 = [p0]; \
R0 = (N); \
jump __common_int_entry;
/* This one pushes RETI without using CLI. Interrupts are enabled. */
#define SAVE_CONTEXT_SYSCALL save_context_syscall
#define SAVE_CONTEXT save_context_with_interrupts
#define RESTORE_ALL_SYS restore_context_no_interrupts
#define RESTORE_CONTEXT restore_context_with_interrupts
#endif /* __ASSEMBLY__ */
#endif /* __BFIN_ENTRY_H */