1 files changed, 73 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/pseudodbg.c b/arch/blackfin/kernel/pseudodbg.c
new file mode 100644
index 000000000000..4474b8db3501
--- /dev/null
+++ b/arch/blackfin/kernel/pseudodbg.c
@@ -0,0 +1,73 @@
+/* The fake debug assert instructions
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+
+#define PseudoDbg_Assert_opcode         0xf0000000
+#define PseudoDbg_Assert_expected_bits  0
+#define PseudoDbg_Assert_expected_mask  0xffff
+#define PseudoDbg_Assert_regtest_bits   16
+#define PseudoDbg_Assert_regtest_mask   0x7
+#define PseudoDbg_Assert_grp_bits       19
+#define PseudoDbg_Assert_grp_mask       0x7
+#define PseudoDbg_Assert_dbgop_bits     22
+#define PseudoDbg_Assert_dbgop_mask     0x3
+#define PseudoDbg_Assert_dontcare_bits  24
+#define PseudoDbg_Assert_dontcare_mask  0x7
+#define PseudoDbg_Assert_code_bits      27
+#define PseudoDbg_Assert_code_mask      0x1f
+
+bool execute_pseudodbg_assert(struct pt_regs *fp, unsigned int opcode)
+{
+	int expected = ((opcode >> PseudoDbg_Assert_expected_bits) & PseudoDbg_Assert_expected_mask);
+	int dbgop    = ((opcode >> (PseudoDbg_Assert_dbgop_bits)) & PseudoDbg_Assert_dbgop_mask);
+	int grp      = ((opcode >> (PseudoDbg_Assert_grp_bits)) & PseudoDbg_Assert_grp_mask);
+	int regtest  = ((opcode >> (PseudoDbg_Assert_regtest_bits)) & PseudoDbg_Assert_regtest_mask);
+	long *value = &fp->r0;
+
+	if ((opcode & 0xFF000000) != PseudoDbg_Assert_opcode)
+		return false;
+
+	/* Only do Dregs and Pregs for now */
+	if (grp > 1)
+		return false;
+
+	/*
+	 * Unfortunately, the pt_regs structure is not laid out the same way as the
+	 * hardware register file, so we need to do some fix ups.
+	 */
+	if (grp == 0 || (grp == 1 && regtest < 6))
+		value -= (regtest + 8 * grp);
+	else if (grp == 1 && regtest == 6)
+		value = &fp->usp;
+	else if (grp == 1 && regtest == 7)
+		value = &fp->fp;
+
+	if (dbgop == 0 || dbgop == 2) {
+		/* DBGA ( regs_lo , uimm16 ) */
+		/* DBGAL ( regs , uimm16 ) */
+		if (expected != (*value & 0xFFFF)) {
+			pr_notice("DBGA (%s%i.L,0x%x) failure, got 0x%x\n", grp ? "P" : "R",
+				regtest, expected, (unsigned int)(*value & 0xFFFF));
+			return false;
+		}
+
+	} else if (dbgop == 1 || dbgop == 3) {
+		/* DBGA ( regs_hi , uimm16 ) */
+		/* DBGAH ( regs , uimm16 ) */
+		if (expected != ((*value >> 16) & 0xFFFF)) {
+			pr_notice("DBGA (%s%i.H,0x%x) failure, got 0x%x\n", grp ? "P" : "R",
+				regtest, expected, (unsigned int)((*value >> 16) & 0xFFFF));
+			return false;
+		}
+	}
+
+	fp->pc += 4;
+	return true;
+}