[Blackfin] arch: change the trace buffer control start/stop logic in the exception handlers
To save/restore the trace buffer control so that if we take an exception after turning off the trace buffer at a higher level we dont inadvertently turn the trace buffer back on Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
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@ -121,6 +121,7 @@ ENTRY(_ex_icplb_miss)
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(R7:6,P5:4) = [sp++];
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ASTAT = [sp++];
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SAVE_ALL_SYS
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DEBUG_HWTRACE_SAVE(p5, r7)
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#ifdef CONFIG_MPU
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R0 = SEQSTAT;
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R1 = SP;
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@ -132,14 +133,13 @@ ENTRY(_ex_icplb_miss)
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#else
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call __cplb_hdr;
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#endif
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DEBUG_START_HWTRACE(p5, r7)
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DEBUG_HWTRACE_RESTORE(p5, r7)
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RESTORE_ALL_SYS
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SP = EX_SCRATCH_REG;
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rtx;
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ENDPROC(_ex_icplb_miss)
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ENTRY(_ex_syscall)
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DEBUG_START_HWTRACE(p5, r7)
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(R7:6,P5:4) = [sp++];
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ASTAT = [sp++];
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raise 15; /* invoked by TRAP #0, for sys call */
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@ -178,7 +178,6 @@ ENTRY(_ex_single_step)
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ENDPROC(_ex_single_step)
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ENTRY(_bfin_return_from_exception)
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DEBUG_START_HWTRACE(p5, r7)
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#if ANOMALY_05000257
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R7=LC0;
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LC0=R7;
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@ -200,7 +199,6 @@ ENTRY(_handle_bad_cplb)
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* need to make a CPLB exception look like a normal exception
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*/
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DEBUG_START_HWTRACE(p5, r7)
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RESTORE_ALL_SYS
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[--sp] = ASTAT;
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[--sp] = (R7:6,P5:4);
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@ -253,7 +251,6 @@ ENTRY(_ex_trap_c)
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R6 = SEQSTAT;
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[P5] = R6;
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DEBUG_START_HWTRACE(p5, r7)
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(R7:6,P5:4) = [sp++];
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ASTAT = [sp++];
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SP = EX_SCRATCH_REG;
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@ -383,7 +380,6 @@ ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
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/* Try to deal with syscalls quickly. */
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[--sp] = ASTAT;
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[--sp] = (R7:6,P5:4);
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DEBUG_STOP_HWTRACE(p5, r7)
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r7 = SEQSTAT; /* reason code is in bit 5:0 */
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r6.l = lo(SEQSTAT_EXCAUSE);
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r6.h = hi(SEQSTAT_EXCAUSE);
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@ -46,42 +46,47 @@ extern unsigned long software_trace_buff[];
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#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
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#define TRACE_BUFFER_START(preg, dreg) trace_buffer_start(preg, dreg)
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#define TRACE_BUFFER_STOP(preg, dreg) trace_buffer_stop(preg, dreg)
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#define trace_buffer_stop(preg, dreg) \
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preg.L = LO(TBUFCTL); \
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preg.H = HI(TBUFCTL); \
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dreg = 0x1; \
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[preg] = dreg;
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#define trace_buffer_start(preg, dreg) \
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preg.L = LO(TBUFCTL); \
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preg.H = HI(TBUFCTL); \
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dreg = BFIN_TRACE_ON; \
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[preg] = dreg;
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#define trace_buffer_init(preg, dreg) \
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preg.L = LO(TBUFCTL); \
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preg.H = HI(TBUFCTL); \
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dreg = BFIN_TRACE_INIT; \
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[preg] = dreg;
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#define trace_buffer_save(preg, dreg) \
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preg.L = LO(TBUFCTL); \
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preg.H = HI(TBUFCTL); \
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dreg = [preg]; \
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[sp++] = dreg; \
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dreg = 0x1; \
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[preg] = dreg;
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#define trace_buffer_restore(preg, dreg) \
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preg.L = LO(TBUFCTL); \
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preg.H = HI(TBUFCTL); \
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dreg = [sp--]; \
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[preg] = dreg;
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#else /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
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#define trace_buffer_stop(preg, dreg)
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#define trace_buffer_start(preg, dreg)
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#define trace_buffer_init(preg, dreg)
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#define trace_buffer_save(preg, dreg)
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#define trace_buffer_restore(preg, dreg)
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#endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
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#ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
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# define DEBUG_START_HWTRACE(preg, dreg) trace_buffer_start(preg, dreg)
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# define DEBUG_STOP_HWTRACE(preg, dreg) trace_buffer_stop(preg, dreg)
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# define DEBUG_HWTRACE_SAVE(preg, dreg) trace_buffer_save(preg, dreg)
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# define DEBUG_HWTRACE_RESTORE(preg, dreg) trace_buffer_restore(preg, dreg)
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#else
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# define DEBUG_START_HWTRACE(preg, dreg)
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# define DEBUG_STOP_HWTRACE(preg, dreg)
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# define DEBUG_HWTRACE_SAVE(preg, dreg)
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# define DEBUG_HWTRACE_RESTORE(preg, dreg)
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#endif
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#endif /* __ASSEMBLY__ */
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