提交 5400c5aa 编写于 作者: J Jie Zhang 提交者: Bryan Wu

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

Signed-off-by: NJie Zhang <jie.zhang@analog.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
上级 0f0625d8
......@@ -158,6 +158,7 @@ ENTRY(_ex_single_step)
cc = r7 == r6;
if cc jump _bfin_return_from_exception;
#ifdef CONFIG_KGDB
/* Don't do single step in hardware exception handler */
p5.l = lo(IPEND);
p5.h = hi(IPEND);
......@@ -165,7 +166,6 @@ ENTRY(_ex_single_step)
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;
......@@ -191,12 +191,22 @@ ENTRY(_ex_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
......@@ -224,15 +234,11 @@ 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;
jump _ex_trap_c;
/* Fall through to _bfin_return_from_exception. */
ENDPROC(_ex_single_step)
ENTRY(_bfin_return_from_exception)
......
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