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Blackfin arch: Fix bug - skip single step in high priority interrupt handler instead of disabling all interrupts in single step debugging.

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Skip single step if event priority of current instruction is higher than
that of the first instruction, from which gdb starts single step.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Sonic Zhang 2008-07-26 18:54:38 +08:00 committed by Bryan Wu
parent 3a2521fa75
commit 0d1cdd7ab6
2 changed files with 53 additions and 13 deletions
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16
arch/blackfin/kernel/kgdb.c
View file

@ -203,6 +203,8 @@ struct hw_breakpoint {
int kgdb_arch_init(void)
{
debugger_step = 0;
kgdb_remove_all_hw_break();
return 0;
}
@ -368,6 +370,7 @@ int kgdb_arch_handle_exception(int exceptionVector, int signo,
char *ptr;
int newPC;
int wp_status;
int i;
switch (remcom_in_buffer[0]) {
case 'c':
@ -392,7 +395,18 @@ int kgdb_arch_handle_exception(int exceptionVector, int signo,
/* set the trace bit if we're stepping */
if (remcom_in_buffer[0] == 's') {
linux_regs->syscfg |= 0x1;
debugger_step = 1;
debugger_step = linux_regs->ipend;
debugger_step >>= 6;
for (i = 10; i > 0; i--, debugger_step >>= 1)
if (debugger_step & 1)
break;
/* i indicate event priority of current stopped instruction
* user space instruction is 0, IVG15 is 1, IVTMR is 10.
* debugger_step > 0 means in single step mode
*/
debugger_step = i + 1;
} else {
debugger_step = 0;
}
wp_status = bfin_read_WPSTAT();

50
arch/blackfin/mach-common/entry.S
View file

@ -158,23 +158,45 @@ ENTRY(_ex_single_step)
cc = r7 == r6;
if cc jump _bfin_return_from_exception;
/* Don't do single step in hardware exception handler */
p5.l = lo(IPEND);
p5.h = hi(IPEND);
r6 = [p5];
cc = bittst(r6, 5);
if cc jump _bfin_return_from_exception;
#ifdef CONFIG_KGDB
/* skip single step if current interrupt priority is higher than
* that of the first instruction, from which gdb starts single step */
r6 >>= 6;
r7 = 10;
.Lfind_priority_start:
cc = bittst(r6, 0);
if cc jump .Lfind_priority_done;
r6 >>= 1;
r7 += -1;
cc = r7 == 0;
if cc jump .Lfind_priority_done;
jump.s .Lfind_priority_start;
.Lfind_priority_done:
p4.l = _debugger_step;
p4.h = _debugger_step;
r6 = [p4];
cc = r6 == 0;
if cc jump .Ldo_single_step;
r6 += -1;
cc = r6 < r7;
if cc jump _bfin_return_from_exception;
.Ldo_single_step:
#endif
/* If we were in user mode, do the single step normally. */
p5.l = lo(IPEND);
p5.h = hi(IPEND);
r6 = [p5];
r7 = 0xffe0 (z);
r7 = r7 & r6;
cc = r7 == 0;
if !cc jump 1f;
if cc jump 1f;
/* Single stepping only a single instruction, so clear the trace
* bit here. */
r7 = syscfg;
bitclr (r7, 0);
syscfg = R7;
jump _ex_trap_c;
1:
/*
* We were in an interrupt handler. By convention, all of them save
* SYSCFG with their first instruction, so by checking whether our
@ -202,11 +224,15 @@ ENTRY(_ex_single_step)
cc = R7 == R6;
if !cc jump _bfin_return_from_exception;
1:
/* Single stepping only a single instruction, so clear the trace
* bit here. */
r7 = syscfg;
bitclr (r7, 0);
syscfg = R7;
/* Fall through to _bfin_return_from_exception. */
jump _ex_trap_c;
ENDPROC(_ex_single_step)
ENTRY(_bfin_return_from_exception)