Linux-libre 4.5-gnu

6 files changed, 172 insertions, 20 deletions

diff --git a/arch/h8300/kernel/Makefile b/arch/h8300/kernel/Makefile
index 5bc33f2fc..253f8e322 100644
--- a/arch/h8300/kernel/Makefile
+++ b/arch/h8300/kernel/Makefile
@@ -17,3 +17,5 @@ obj-$(CONFIG_H8S_SIM) += sim-console.o
 
 obj-$(CONFIG_CPU_H8300H) += ptrace_h.o
 obj-$(CONFIG_CPU_H8S) += ptrace_s.o
+
+obj-$(CONFIG_KGDB) += kgdb.o
diff --git a/arch/h8300/kernel/entry.S b/arch/h8300/kernel/entry.S
index 797dfa8dd..4f67d4b35 100644
--- a/arch/h8300/kernel/entry.S
+++ b/arch/h8300/kernel/entry.S
@@ -188,7 +188,11 @@ _interrupt_redirect_table:
 	jsr	@_interrupt_entry		/* NMI */
 	jmp	@_system_call			/* TRAPA #0 (System call) */
 	.long	0
+#if defined(CONFIG_KGDB)
+	jmp	@_kgdb_trap
+#else
 	.long	0
+#endif
 	jmp	@_trace_break			/* TRAPA #3 (breakpoint) */
 	.rept	INTERRUPTS-12
 	jsr	@_interrupt_entry
@@ -242,6 +246,7 @@ _system_call:
 	/* save top of frame */
 	mov.l	sp,er0
 	jsr	@set_esp0
+	andc	#0x3f,ccr
 	mov.l	sp,er2
 	and.w	#0xe000,r2
 	mov.l	@(TI_FLAGS:16,er2),er2
@@ -405,6 +410,20 @@ _nmi:
 	mov.l	@sp+, er0
 	jmp	@_interrupt_entry
 
+#if defined(CONFIG_KGDB)
+_kgdb_trap:
+	subs	#4,sp
+	SAVE_ALL
+	mov.l	sp,er0
+	add.l	#LRET,er0
+	mov.l	er0,@(LSP,sp)
+	jsr	@set_esp0
+	mov.l	sp,er0
+	subs	#4,er0
+	jsr	@h8300_kgdb_trap
+	jmp	@ret_from_exception
+#endif
+
 	.section	.bss
 _sw_ksp:
 	.space	4
diff --git a/arch/h8300/kernel/kgdb.c b/arch/h8300/kernel/kgdb.c
new file mode 100644
index 000000000..602e478af
--- /dev/null
+++ b/arch/h8300/kernel/kgdb.c
@@ -0,0 +1,135 @@
+/*
+ * H8/300 KGDB support
+ *
+ * Copyright (C) 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/ptrace.h>
+#include <linux/kgdb.h>
+#include <linux/kdebug.h>
+#include <linux/io.h>
+
+struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
+	{ "er0", GDB_SIZEOF_REG, offsetof(struct pt_regs, er0) },
+	{ "er1", GDB_SIZEOF_REG, offsetof(struct pt_regs, er1) },
+	{ "er2", GDB_SIZEOF_REG, offsetof(struct pt_regs, er2) },
+	{ "er3", GDB_SIZEOF_REG, offsetof(struct pt_regs, er3) },
+	{ "er4", GDB_SIZEOF_REG, offsetof(struct pt_regs, er4) },
+	{ "er5", GDB_SIZEOF_REG, offsetof(struct pt_regs, er5) },
+	{ "er6", GDB_SIZEOF_REG, offsetof(struct pt_regs, er6) },
+	{ "sp", GDB_SIZEOF_REG, offsetof(struct pt_regs, sp) },
+	{ "ccr", GDB_SIZEOF_REG, offsetof(struct pt_regs, ccr) },
+	{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, pc) },
+	{ "cycles", GDB_SIZEOF_REG, -1 },
+#if defined(CONFIG_CPU_H8S)
+	{ "exr", GDB_SIZEOF_REG, offsetof(struct pt_regs, exr) },
+#endif
+	{ "tick", GDB_SIZEOF_REG, -1 },
+	{ "inst", GDB_SIZEOF_REG, -1 },
+};
+
+char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
+{
+	if (regno >= DBG_MAX_REG_NUM || regno < 0)
+		return NULL;
+
+	switch (regno) {
+	case GDB_CCR:
+#if defined(CONFIG_CPU_H8S)
+	case GDB_EXR:
+#endif
+		*(u32 *)mem = *(u16 *)((void *)regs +
+				       dbg_reg_def[regno].offset);
+		break;
+	default:
+		if (dbg_reg_def[regno].offset >= 0)
+			memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
+			       dbg_reg_def[regno].size);
+		else
+			memset(mem, 0, dbg_reg_def[regno].size);
+		break;
+	}
+	return dbg_reg_def[regno].name;
+}
+
+int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
+{
+	if (regno >= DBG_MAX_REG_NUM || regno < 0)
+		return -EINVAL;
+
+	switch (regno) {
+	case GDB_CCR:
+#if defined(CONFIG_CPU_H8S)
+	case GDB_EXR:
+#endif
+		*(u16 *)((void *)regs +
+			 dbg_reg_def[regno].offset) = *(u32 *)mem;
+		break;
+	default:
+		memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
+		       dbg_reg_def[regno].size);
+	}
+	return 0;
+}
+
+asmlinkage void h8300_kgdb_trap(struct pt_regs *regs)
+{
+	regs->pc &= 0x00ffffff;
+	if (kgdb_handle_exception(10, SIGTRAP, 0, regs))
+		return;
+	if (*(u16 *)(regs->pc) == *(u16 *)&arch_kgdb_ops.gdb_bpt_instr)
+		regs->pc += BREAK_INSTR_SIZE;
+	regs->pc |= regs->ccr << 24;
+}
+
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+	memset((char *)gdb_regs, 0, NUMREGBYTES);
+	gdb_regs[GDB_SP] = p->thread.ksp;
+	gdb_regs[GDB_PC] = KSTK_EIP(p);
+}
+
+void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
+{
+	regs->pc = pc;
+}
+
+int kgdb_arch_handle_exception(int vector, int signo, int err_code,
+				char *remcom_in_buffer, char *remcom_out_buffer,
+				struct pt_regs *regs)
+{
+	char *ptr;
+	unsigned long addr;
+
+	switch (remcom_in_buffer[0]) {
+	case 's':
+	case 'c':
+		/* handle the optional parameters */
+		ptr = &remcom_in_buffer[1];
+		if (kgdb_hex2long(&ptr, &addr))
+			regs->pc = addr;
+
+		return 0;
+	}
+
+	return -1; /* this means that we do not want to exit from the handler */
+}
+
+int kgdb_arch_init(void)
+{
+	return 0;
+}
+
+void kgdb_arch_exit(void)
+{
+	/* Nothing to do */
+}
+
+const struct kgdb_arch arch_kgdb_ops = {
+	/* Breakpoint instruction: trapa #2 */
+	.gdb_bpt_instr = { 0x57, 0x20 },
+};
diff --git a/arch/h8300/kernel/setup.c b/arch/h8300/kernel/setup.c
index c772abe6d..e4985dfa9 100644
--- a/arch/h8300/kernel/setup.c
+++ b/arch/h8300/kernel/setup.c
@@ -207,14 +207,14 @@ device_initcall(device_probe);
 #define get_wait(base, addr) ({		\
 	int baddr;			\
 	baddr = ((addr) / 0x200000 * 2);			     \
-	w *= (ctrl_inw((unsigned long)(base) + 2) & (3 << baddr)) + 1;	\
+	w *= (readw((base) + 2) & (3 << baddr)) + 1;		     \
 	})
 #endif
 #if defined(CONFIG_CPU_H8S)
 #define get_wait(base, addr) ({		\
 	int baddr;			\
 	baddr = ((addr) / 0x200000 * 16);			     \
-	w *= (ctrl_inl((unsigned long)(base) + 2) & (7 << baddr)) + 1;	\
+	w *= (readl((base) + 2) & (7 << baddr)) + 1;	\
 	})
 #endif
 
@@ -228,8 +228,8 @@ static __init int access_timing(void)
 
 	bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
 	base = of_iomap(bsc, 0);
-	w = (ctrl_inb((unsigned long)base + 0) & bit)?2:1;
-	if (ctrl_inb((unsigned long)base + 1) & bit)
+	w = (readb(base + 0) & bit)?2:1;
+	if (readb(base + 1) & bit)
 		w *= get_wait(base, addr);
 	else
 		w *= 2;
diff --git a/arch/h8300/kernel/signal.c b/arch/h8300/kernel/signal.c
index 380fffd08..ad1f81f57 100644
--- a/arch/h8300/kernel/signal.c
+++ b/arch/h8300/kernel/signal.c
@@ -95,7 +95,7 @@ restore_sigcontext(struct sigcontext *usc, int *pd0)
 	regs->ccr |= ccr;
 	regs->orig_er0 = -1;		/* disable syscall checks */
 	err |= __get_user(usp, &usc->sc_usp);
-	wrusp(usp);
+	regs->sp = usp;
 
 	err |= __get_user(er0, &usc->sc_er0);
 	*pd0 = er0;
@@ -180,7 +180,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
 		return -EFAULT;
 
 	/* Set up to return from userspace.  */
-	ret = frame->retcode;
+	ret = (unsigned char *)&frame->retcode;
 	if (ksig->ka.sa.sa_flags & SA_RESTORER)
 		ret = (unsigned char *)(ksig->ka.sa.sa_restorer);
 	else {
@@ -196,8 +196,8 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
 		return -EFAULT;
 
 	/* Set up registers for signal handler */
-	wrusp((unsigned long) frame);
-	regs->pc  = (unsigned long) ksig->ka.sa.sa_handler;
+	regs->sp  = (unsigned long)frame;
+	regs->pc  = (unsigned long)ksig->ka.sa.sa_handler;
 	regs->er0 = ksig->sig;
 	regs->er1 = (unsigned long)&(frame->info);
 	regs->er2 = (unsigned long)&frame->uc;
diff --git a/arch/h8300/kernel/traps.c b/arch/h8300/kernel/traps.c
index 1b2d7cdd6..044a36125 100644
--- a/arch/h8300/kernel/traps.c
+++ b/arch/h8300/kernel/traps.c
@@ -125,17 +125,18 @@ void show_stack(struct task_struct *task, unsigned long *esp)
 
 	pr_info("Stack from %08lx:", (unsigned long)stack);
 	for (i = 0; i < kstack_depth_to_print; i++) {
-		if (((unsigned long)stack & (THREAD_SIZE - 1)) == 0)
+		if (((unsigned long)stack & (THREAD_SIZE - 1)) >=
+		    THREAD_SIZE-4)
 			break;
 		if (i % 8 == 0)
-			pr_info("\n       ");
-		pr_info(" %08lx", *stack++);
+			pr_info(" ");
+		pr_cont(" %08lx", *stack++);
 	}
 
-	pr_info("\nCall Trace:");
+	pr_info("\nCall Trace:\n");
 	i = 0;
 	stack = esp;
-	while (((unsigned long)stack & (THREAD_SIZE - 1)) != 0) {
+	while (((unsigned long)stack & (THREAD_SIZE - 1)) < THREAD_SIZE-4) {
 		addr = *stack++;
 		/*
 		 * If the address is either in the text segment of the
@@ -147,15 +148,10 @@ void show_stack(struct task_struct *task, unsigned long *esp)
 		 */
 		if (check_kernel_text(addr)) {
 			if (i % 4 == 0)
-				pr_info("\n       ");
-			pr_info(" [<%08lx>]", addr);
+				pr_info("       ");
+			pr_cont(" [<%08lx>]", addr);
 			i++;
 		}
 	}
 	pr_info("\n");
 }
-
-void show_trace_task(struct task_struct *tsk)
-{
-	show_stack(tsk, (unsigned long *)tsk->thread.esp0);
-}