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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2a0c4fdb66
There were a couple of problems with the way the trace buffer state is saved/restored in assembly. The DEBUG_HWTRACE_SAVE/RESTORE macros save a value to the stack, which is not immediately obvious; the CPLB exception code needed changes to load the correct value of the stack pointer. The other problem is that the SAVE/RESTORE macros weren't pushing and popping the value downwards on the stack, but rather moving it _upwards_, which is of course completely broken. We also need to make sure there's a matching DEBUG_HWTRACE_RESTORE in the error case of the CPLB handler. Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: Bryan Wu <cooloney@kernel.org>
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/*
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* Common header file for blackfin family of processors.
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*
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*/
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#ifndef _BLACKFIN_TRACE_
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#define _BLACKFIN_TRACE_
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/* Normally, we use ON, but you can't turn on software expansion until
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* interrupts subsystem is ready
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*/
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#define BFIN_TRACE_INIT ((CONFIG_DEBUG_BFIN_HWTRACE_COMPRESSION << 4) | 0x03)
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#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
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#define BFIN_TRACE_ON (BFIN_TRACE_INIT | (CONFIG_DEBUG_BFIN_HWTRACE_EXPAND << 2))
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#else
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#define BFIN_TRACE_ON (BFIN_TRACE_INIT)
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#endif
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#ifndef __ASSEMBLY__
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extern unsigned long trace_buff_offset;
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extern unsigned long software_trace_buff[];
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/* Trace Macros for C files */
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#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
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#define trace_buffer_save(x) \
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do { \
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(x) = bfin_read_TBUFCTL(); \
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bfin_write_TBUFCTL((x) & ~TBUFEN); \
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} while (0)
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#define trace_buffer_restore(x) \
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do { \
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bfin_write_TBUFCTL((x)); \
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} while (0)
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#else /* DEBUG_BFIN_HWTRACE_ON */
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#define trace_buffer_save(x)
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#define trace_buffer_restore(x)
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#endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
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#else
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/* Trace Macros for Assembly files */
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#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
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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_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_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_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_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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#endif /* _BLACKFIN_TRACE_ */
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