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Blackfin: cleanup code a bit with comments and defines
Improve the assembly with a few explanatory comments and use symbolic defines rather than numeric values for bit positions. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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35b5c55fee
commit
1997660cea
1 changed files with 7 additions and 5 deletions
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@ -218,7 +218,7 @@ ENTRY(_ex_single_step)
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/* Single stepping only a single instruction, so clear the trace
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* bit here. */
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r7 = syscfg;
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bitclr (r7, 0);
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bitclr (r7, SYSCFG_SSSTEP_P);
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syscfg = R7;
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jump _ex_trap_c;
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@ -251,7 +251,7 @@ ENTRY(_ex_single_step)
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if !cc jump _bfin_return_from_exception;
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r7 = syscfg;
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bitclr (r7, 0);
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bitclr (r7, SYSCFG_SSSTEP_P); /* Turn off single step */
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syscfg = R7;
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/* Fall through to _bfin_return_from_exception. */
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@ -342,9 +342,11 @@ ENTRY(_ex_trap_c)
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r6 = retx;
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[p5 + PDA_RETX] = r6;
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#endif
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/* Save the state of single stepping */
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r6 = SYSCFG;
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[p5 + PDA_SYSCFG] = r6;
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BITCLR(r6, 0);
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/* Clear it while we handle the exception in IRQ5 mode */
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BITCLR(r6, SYSCFG_SSSTEP_P);
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SYSCFG = r6;
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/* Disable all interrupts, but make sure level 5 is enabled so
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@ -367,7 +369,7 @@ ENDPROC(_ex_trap_c)
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* exception. This is a unrecoverable event, so crash.
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* Note: this cannot be ENTRY() as we jump here with "if cc jump" ...
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*/
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_double_fault:
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ENTRY(_double_fault)
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/* Turn caches & protection off, to ensure we don't get any more
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* double exceptions
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*/
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@ -872,7 +874,7 @@ ENTRY(_ret_from_exception)
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raise 15; /* raise evt15 to do signal or reschedule */
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4:
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r0 = syscfg;
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bitclr(r0, 0);
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bitclr(r0, SYSCFG_SSSTEP_P); /* Turn off single step */
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syscfg = r0;
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5:
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rts;
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