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Blackfin arch: Fix bug - This change eliminates impact on application debugging 

Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Jie Zhang 2008-08-05 17:33:38 +08:00 committed by Bryan Wu
parent 0f0625d895
commit 5400c5aa2d
1 changed files with 13 additions and 7 deletions
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20
arch/blackfin/mach-common/entry.S
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@ -158,6 +158,7 @@ ENTRY(_ex_single_step)
cc = r7 == r6; cc = r7 == r6;
if cc jump _bfin_return_from_exception; if cc jump _bfin_return_from_exception;
#ifdef CONFIG_KGDB
/* Don't do single step in hardware exception handler */ /* Don't do single step in hardware exception handler */
p5.l = lo(IPEND); p5.l = lo(IPEND);
p5.h = hi(IPEND); p5.h = hi(IPEND);
@ -165,7 +166,6 @@ ENTRY(_ex_single_step)
cc = bittst(r6, 5); cc = bittst(r6, 5);
if cc jump _bfin_return_from_exception; if cc jump _bfin_return_from_exception;
#ifdef CONFIG_KGDB
/* skip single step if current interrupt priority is higher than /* skip single step if current interrupt priority is higher than
* that of the first instruction, from which gdb starts single step */ * that of the first instruction, from which gdb starts single step */
r6 >>= 6; r6 >>= 6;
@ -191,12 +191,22 @@ ENTRY(_ex_single_step)
#endif #endif
/* If we were in user mode, do the single step normally. */ /* If we were in user mode, do the single step normally. */
p5.l = lo(IPEND);
p5.h = hi(IPEND);
r6 = [p5]; r6 = [p5];
r7 = 0xffe0 (z); r7 = 0xffe0 (z);
r7 = r7 & r6; r7 = r7 & r6;
cc = r7 == 0; 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 * We were in an interrupt handler. By convention, all of them save
* SYSCFG with their first instruction, so by checking whether our * SYSCFG with their first instruction, so by checking whether our
@ -224,15 +234,11 @@ ENTRY(_ex_single_step)
cc = R7 == R6; cc = R7 == R6;
if !cc jump _bfin_return_from_exception; if !cc jump _bfin_return_from_exception;
1:
/* Single stepping only a single instruction, so clear the trace
* bit here. */
r7 = syscfg; r7 = syscfg;
bitclr (r7, 0); bitclr (r7, 0);
syscfg = R7; syscfg = R7;
jump _ex_trap_c; /* Fall through to _bfin_return_from_exception. */
ENDPROC(_ex_single_step) ENDPROC(_ex_single_step)
ENTRY(_bfin_return_from_exception) ENTRY(_bfin_return_from_exception)