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| author | Robin Getz <robin.getz@analog.com> | 2007-07-25 11:03:28 +0800 |
|---|---|---|
| committer | Bryan Wu <bryan.wu@analog.com> | 2007-07-25 11:03:28 +0800 |
| commit | 518039bc24cbb9ce34665814fe120eac50bedd9a (patch) | |
| tree | 6b089a05025ae224d6636b6dc9d95e7c9e4677eb /arch/blackfin/mach-common | |
| parent | f16295e7e7f2a2a15876f570f10d6dc8f1f36ab8 (diff) | |
| download | op-kernel-dev-518039bc24cbb9ce34665814fe120eac50bedd9a.zip op-kernel-dev-518039bc24cbb9ce34665814fe120eac50bedd9a.tar.gz | |
Blackfin arch: Add ability to expend the hardware trace buffer
Add ability to expend the hardware trace buffer via a configurable
software buffer - so you can have lots of history when a crash occurs.
The interesting way we do printk in the traps.c confusese the checking
script
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin/mach-common')
| -rw-r--r-- | arch/blackfin/mach-common/entry.S | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S index 207e697..ab278a7 100644 --- a/arch/blackfin/mach-common/entry.S +++ b/arch/blackfin/mach-common/entry.S @@ -731,6 +731,75 @@ ENTRY(_init_exception_buff) rts; ENDPROC(_init_exception_buff) +/* We handle this 100% in exception space - to reduce overhead + * Only potiential problem is if the software buffer gets swapped out of the + * CPLB table - then double fault. - so we don't let this happen in other places + */ +#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND +ENTRY(_ex_trace_buff_full) + [--sp] = P3; + [--sp] = P2; + [--sp] = LC0; + [--sp] = LT0; + [--sp] = LB0; + P5.L = _trace_buff_offset; + P5.H = _trace_buff_offset; + P3 = [P5]; /* trace_buff_offset */ + P5.L = lo(TBUFSTAT); + P5.H = hi(TBUFSTAT); + R7 = [P5]; + R7 <<= 1; /* double, since we need to read twice */ + LC0 = R7; + R7 <<= 2; /* need to shift over again, + * to get the number of bytes */ + P5.L = lo(TBUF); + P5.H = hi(TBUF); + R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1; + + P2 = R7; + P3 = P3 + P2; + R7 = P3; + R7 = R7 & R6; + P3 = R7; + P2.L = _trace_buff_offset; + P2.H = _trace_buff_offset; + [P2] = P3; + + P2.L = _software_trace_buff; + P2.H = _software_trace_buff; + + LSETUP (.Lstart, .Lend) LC0; +.Lstart: + R7 = [P5]; /* read TBUF */ + P4 = P3 + P2; + [P4] = R7; + P3 += -4; + R7 = P3; + R7 = R7 & R6; +.Lend: + P3 = R7; + + LB0 = [sp++]; + LT0 = [sp++]; + LC0 = [sp++]; + P2 = [sp++]; + P3 = [sp++]; + jump _return_from_exception; + +#if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4 +.data +#else +.section .l1.data.B +#endif +ENTRY(_trace_buff_offset) + .long 0; +ALIGN +ENTRY(_software_trace_buff) + .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256); + .long 0 + .endr +#endif + /* * Put these in the kernel data section - that should always be covered by * a CPLB. This is needed to ensure we don't get double fault conditions @@ -764,7 +833,11 @@ _extable: .long _ex_trap_c /* 0x0E - User Defined */ .long _ex_trap_c /* 0x0F - User Defined */ .long _ex_single_step /* 0x10 - HW Single step */ +#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND + .long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */ +#else .long _ex_trap_c /* 0x11 - Trace Buffer Full */ +#endif .long _ex_trap_c /* 0x12 - Reserved */ .long _ex_trap_c /* 0x13 - Reserved */ .long _ex_trap_c /* 0x14 - Reserved */ |
