Blackfin: decode hwerrcause/excause when crashing

Having to decode hwerrcause/excause values is a pain, so automate it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/cpu/blackfin/traps.c b/cpu/blackfin/traps.c
index 5a26c52e844597c9fb529f64ecf8669c47419b9b..d17c0a195dcfed6aed122b0ddb7022d695fc7fc6 100644 (file)
--- a/cpu/blackfin/traps.c
+++ b/cpu/blackfin/traps.c
@@ -236,10 +236,45 @@ static void decode_address(char *buf, unsigned long address)
                sprintf(buf, "<0x%p> /* unknown address */", address);
 }
 
+static char *strhwerrcause(uint16_t hwerrcause)
+{
+       switch (hwerrcause) {
+               case 0x02: return "system mmr error";
+               case 0x03: return "external memory addressing error";
+               case 0x12: return "performance monitor overflow";
+               case 0x18: return "raise 5 instruction";
+               default:   return "undef";
+       }
+}
+
+static char *strexcause(uint16_t excause)
+{
+       switch (excause) {
+               case 0x00 ... 0xf: return "custom exception";
+               case 0x10: return "single step";
+               case 0x11: return "trace buffer full";
+               case 0x21: return "undef inst";
+               case 0x22: return "illegal inst";
+               case 0x23: return "dcplb prot violation";
+               case 0x24: return "misaligned data";
+               case 0x25: return "unrecoverable event";
+               case 0x26: return "dcplb miss";
+               case 0x27: return "multiple dcplb hit";
+               case 0x28: return "emulation watchpoint";
+               case 0x2a: return "misaligned inst";
+               case 0x2b: return "icplb prot violation";
+               case 0x2c: return "icplb miss";
+               case 0x2d: return "multiple icplb hit";
+               case 0x2e: return "illegal use of supervisor resource";
+               default:   return "undef";
+       }
+}
+
 void dump(struct pt_regs *fp)
 {
        char buf[150];
        size_t i;
+       uint16_t hwerrcause, excause;
 
        if (!ENABLE_DUMP)
                return;
@@ -247,11 +282,14 @@ void dump(struct pt_regs *fp)
        /* fp->ipend is garbage, so load it ourself */
        fp->ipend = bfin_read_IPEND();
 
+       hwerrcause = (fp->seqstat & HWERRCAUSE) >> HWERRCAUSE_P;
+       excause = (fp->seqstat & EXCAUSE) >> EXCAUSE_P;
+
        printf("SEQUENCER STATUS:\n");
        printf(" SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
                fp->seqstat, fp->ipend, fp->syscfg);
-       printf("  HWERRCAUSE: 0x%lx\n", (fp->seqstat & HWERRCAUSE) >> HWERRCAUSE_P);
-       printf("  EXCAUSE   : 0x%lx\n", (fp->seqstat & EXCAUSE) >> EXCAUSE_P);
+       printf("  HWERRCAUSE: 0x%lx: %s\n", hwerrcause, strhwerrcause(hwerrcause));
+       printf("  EXCAUSE   : 0x%lx: %s\n", excause, strexcause(excause));
        for (i = 6; i <= 15; ++i) {
                if (fp->ipend & (1 << i)) {
                        decode_address(buf, bfin_read32(EVT0 + 4*i));