diff options
| author | Min Xu <min.xu@min-info.net> | 2014-10-25 21:30:23 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2014-11-11 22:30:55 +0100 |
| commit | 8701086cacca088ae34580908cec45f77042b94e (patch) | |
| tree | 0755b6b6439acf52ed66ef9b8d1c093247137a64 /firmware/src/simtrace/main_simtrace.c | |
| parent | 6bafd0cfb40c2d201f8723a3678dd4f04b380842 (diff) | |
Retrieve + print previous PC from stack to debug wdog/spurious IRQ
Retrive previous PC from the stack before entering specific interrupt
handler routines. Allow user to trace where interrupt occured: e.g.
WatchDog and Spurious interrupt
Prior to this change, spurious interrupt would occur so much (observed
via gdb/remote debug) so it appears that the board stalled. Once a
custom spurious interrupt installed, the code continues after the
interrupt instead of re-entering the interrupt.
Diffstat (limited to 'firmware/src/simtrace/main_simtrace.c')
| -rw-r--r-- | firmware/src/simtrace/main_simtrace.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/firmware/src/simtrace/main_simtrace.c b/firmware/src/simtrace/main_simtrace.c index b3f2665..b84525f 100644 --- a/firmware/src/simtrace/main_simtrace.c +++ b/firmware/src/simtrace/main_simtrace.c @@ -136,8 +136,24 @@ static int simtrace_usb_in(struct req_ctx *rctx) } } +void custom_spurious_handler(unsigned previous_pc) +{ + char dbg_buf[100]; + sprintf(dbg_buf, "SPURRIOUS IRQ [Old PC = %08X]\n\r", previous_pc); + AT91F_DBGU_Frame(dbg_buf); +} + +void custom_spurious_entry(void) +{ + register unsigned *previous_pc asm("r0"); + asm("ADD R1, SP, #16; LDR R0, [R1]"); + custom_spurious_handler(previous_pc); +} + void _init_func(void) { + AT91C_BASE_AIC->AIC_SPU = (int)custom_spurious_entry; + /* low-level hardware initialization */ pio_irq_init(); iso_uart_init(); |