git » linux-kernel » commit 6ce3e9c

diff --git a/arch/blackfin/Kconfig.debug b/arch/blackfin/Kconfig.debug
index aec89a5280b..3c49f76b37b 100644
--- a/arch/blackfin/Kconfig.debug
+++ b/arch/blackfin/Kconfig.debug
@@ -264,4 +264,13 @@ config BFIN_ISRAM_SELF_TEST
 	help
 	  Run some self tests of the isram driver code at boot.
 
+config BFIN_PSEUDODBG_INSNS
+	bool "Support pseudo debug instructions"
+	default n
+	help
+	  This option allows the kernel to emulate some pseudo instructions which
+	  allow simulator test cases to be run under Linux with no changes.
+
+	  Most people should say N here.
+
 endmenu
diff --git a/arch/blackfin/include/asm/pseudo_instructions.h b/arch/blackfin/include/asm/pseudo_instructions.h
new file mode 100644
index 00000000000..7173719fb53
--- /dev/null
+++ b/arch/blackfin/include/asm/pseudo_instructions.h
@@ -0,0 +1,17 @@
+/*
+ * header file for pseudo instructions
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef _BLACKFIN_PSEUDO_
+#define _BLACKFIN_PSEUDO_
+
+#include <linux/types.h>
+#include <asm/ptrace.h>
+
+extern bool execute_pseudodbg_assert(struct pt_regs *fp, unsigned int opcode);
+
+#endif
diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile
index 2fc7f32ae32..30d0d1f01dc 100644
--- a/arch/blackfin/kernel/Makefile
+++ b/arch/blackfin/kernel/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_EARLY_PRINTK)           += early_printk.o
 obj-$(CONFIG_EARLY_PRINTK)           += shadow_console.o
 obj-$(CONFIG_STACKTRACE)             += stacktrace.o
 obj-$(CONFIG_DEBUG_VERBOSE)          += trace.o
+obj-$(CONFIG_BFIN_PSEUDODBG_INSNS)   += pseudodbg.o
 
 # the kgdb test puts code into L2 and without linker
 # relaxation, we need to force long calls to/from it
diff --git a/arch/blackfin/kernel/pseudodbg.c b/arch/blackfin/kernel/pseudodbg.c
new file mode 100644
index 00000000000..4474b8db350
--- /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;
+}
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index fffcf8a516b..9369836365b 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -16,6 +16,7 @@
 #include <linux/irq.h>
 #include <asm/trace.h>
 #include <asm/fixed_code.h>
+#include <asm/pseudo_instructions.h>
 
 #ifdef CONFIG_KGDB
 # include <linux/kgdb.h>
@@ -67,6 +68,9 @@ asmlinkage notrace void trap_c(struct pt_regs *fp)
 {
 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 	int j;
+#endif
+#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
+	int opcode;
 #endif
 	unsigned int cpu = raw_smp_processor_id();
 	const char *strerror = NULL;
@@ -199,6 +203,17 @@ asmlinkage notrace void trap_c(struct pt_regs *fp)
 				panic("BUG()");
 			}
 		}
+#endif
+#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
+		/*
+		 * Support for the fake instructions, if the instruction fails,
+		 * then just execute a illegal opcode failure (like normal).
+		 * Don't support these instructions inside the kernel
+		 */
+		if (!kernel_mode_regs(fp) && get_instruction(&opcode, (unsigned short *)fp->pc)) {
+			if (execute_pseudodbg_assert(fp, opcode))
+				goto traps_done;
+		}
 #endif
 		info.si_code = ILL_ILLOPC;
 		sig = SIGILL;