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Diffstat (limited to 'arch/blackfin/kernel/early_printk.c')
-rw-r--r--arch/blackfin/kernel/early_printk.c74
1 files changed, 70 insertions, 4 deletions
diff --git a/arch/blackfin/kernel/early_printk.c b/arch/blackfin/kernel/early_printk.c
index 2ab56811841c..931c78b5ea1f 100644
--- a/arch/blackfin/kernel/early_printk.c
+++ b/arch/blackfin/kernel/early_printk.c
@@ -27,6 +27,7 @@
#include <linux/serial_core.h>
#include <linux/console.h>
#include <linux/string.h>
+#include <linux/reboot.h>
#include <asm/blackfin.h>
#include <asm/irq_handler.h>
#include <asm/early_printk.h>
@@ -181,6 +182,22 @@ asmlinkage void __init init_early_exception_vectors(void)
u32 evt;
SSYNC();
+ /*
+ * This starts up the shadow buffer, incase anything crashes before
+ * setup arch
+ */
+ mark_shadow_error();
+ early_shadow_puts(linux_banner);
+ early_shadow_stamp();
+
+ if (CPUID != bfin_cpuid()) {
+ early_shadow_puts("Running on wrong machine type, expected");
+ early_shadow_reg(CPUID, 16);
+ early_shadow_puts(", but running on");
+ early_shadow_reg(bfin_cpuid(), 16);
+ early_shadow_puts("\n");
+ }
+
/* cannot program in software:
* evt0 - emulation (jtag)
* evt1 - reset
@@ -199,6 +216,7 @@ asmlinkage void __init init_early_exception_vectors(void)
}
+__attribute__((__noreturn__))
asmlinkage void __init early_trap_c(struct pt_regs *fp, void *retaddr)
{
/* This can happen before the uart is initialized, so initialize
@@ -210,10 +228,58 @@ asmlinkage void __init early_trap_c(struct pt_regs *fp, void *retaddr)
if (likely(early_console == NULL) && CPUID == bfin_cpuid())
setup_early_printk(DEFAULT_EARLY_PORT);
- printk(KERN_EMERG "Early panic\n");
- dump_bfin_mem(fp);
- show_regs(fp);
- dump_bfin_trace_buffer();
+ if (!shadow_console_enabled()) {
+ /* crap - we crashed before setup_arch() */
+ early_shadow_puts("panic before setup_arch\n");
+ early_shadow_puts("IPEND:");
+ early_shadow_reg(fp->ipend, 16);
+ if (fp->seqstat & SEQSTAT_EXCAUSE) {
+ early_shadow_puts("\nEXCAUSE:");
+ early_shadow_reg(fp->seqstat & SEQSTAT_EXCAUSE, 8);
+ }
+ if (fp->seqstat & SEQSTAT_HWERRCAUSE) {
+ early_shadow_puts("\nHWERRCAUSE:");
+ early_shadow_reg(
+ (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14, 8);
+ }
+ early_shadow_puts("\nErr @");
+ if (fp->ipend & EVT_EVX)
+ early_shadow_reg(fp->retx, 32);
+ else
+ early_shadow_reg(fp->pc, 32);
+#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
+ early_shadow_puts("\nTrace:");
+ if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
+ while (bfin_read_TBUFSTAT() & TBUFCNT) {
+ early_shadow_puts("\nT :");
+ early_shadow_reg(bfin_read_TBUF(), 32);
+ early_shadow_puts("\n S :");
+ early_shadow_reg(bfin_read_TBUF(), 32);
+ }
+ }
+#endif
+ early_shadow_puts("\nUse bfin-elf-addr2line to determine "
+ "function names\n");
+ /*
+ * We should panic(), but we can't - since panic calls printk,
+ * and printk uses memcpy.
+ * we want to reboot, but if the machine type is different,
+ * can't due to machine specific reboot sequences
+ */
+ if (CPUID == bfin_cpuid()) {
+ early_shadow_puts("Trying to restart\n");
+ machine_restart("");
+ }
+
+ early_shadow_puts("Halting, since it is not safe to restart\n");
+ while (1)
+ asm volatile ("EMUEXCPT; IDLE;\n");
+
+ } else {
+ printk(KERN_EMERG "Early panic\n");
+ show_regs(fp);
+ dump_bfin_trace_buffer();
+ }
panic("Died early");
}