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authorLinus Torvalds <torvalds@linux-foundation.org>2011-03-24 10:07:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-24 10:07:50 -0700
commit3dab04e6978e358ad2307bca563fabd6c5d2c58b (patch)
tree893e9bc5041e7f722722fe13a3b145396f2554d8 /arch/mn10300/include
parent6d1e9a42e7176bbce9348274784b2e5f69223936 (diff)
parent5a4b65ab506398ba5a35c37e06edddd387cc0add (diff)
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300: MN10300: gcc 4.6 vs am33 inline assembly MN10300: Deprecate gdbstub MN10300: Allow KGDB to use the MN10300 serial ports MN10300: Emulate single stepping in KGDB on MN10300 MN10300: Generalise kernel debugger kernel halt, reboot or power off hook KGDB: Notify GDB of machine halt, reboot or power off MN10300: Use KGDB MN10300: Create generic kernel debugger hooks MN10300: Create general kernel debugger cache flushing MN10300: Introduce a general config option for kernel debugger hooks MN10300: The icache invalidate functions should disable the icache first MN10300: gdbstub: Restrict single-stepping to non-preemptable non-SMP configs
Diffstat (limited to 'arch/mn10300/include')
-rw-r--r--arch/mn10300/include/asm/debugger.h43
-rw-r--r--arch/mn10300/include/asm/div64.h21
-rw-r--r--arch/mn10300/include/asm/fpu.h2
-rw-r--r--arch/mn10300/include/asm/irqflags.h2
-rw-r--r--arch/mn10300/include/asm/kgdb.h81
-rw-r--r--arch/mn10300/include/asm/smp.h6
-rw-r--r--arch/mn10300/include/asm/thread_info.h4
7 files changed, 150 insertions, 9 deletions
diff --git a/arch/mn10300/include/asm/debugger.h b/arch/mn10300/include/asm/debugger.h
new file mode 100644
index 00000000000..e1d3b083696
--- /dev/null
+++ b/arch/mn10300/include/asm/debugger.h
@@ -0,0 +1,43 @@
+/* Kernel debugger for MN10300
+ *
+ * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _ASM_DEBUGGER_H
+#define _ASM_DEBUGGER_H
+
+#if defined(CONFIG_KERNEL_DEBUGGER)
+
+extern int debugger_intercept(enum exception_code, int, int, struct pt_regs *);
+extern int at_debugger_breakpoint(struct pt_regs *);
+
+#ifndef CONFIG_MN10300_DEBUGGER_CACHE_NO_FLUSH
+extern void debugger_local_cache_flushinv(void);
+extern void debugger_local_cache_flushinv_one(u8 *);
+#else
+static inline void debugger_local_cache_flushinv(void) {}
+static inline void debugger_local_cache_flushinv_one(u8 *addr) {}
+#endif
+
+#else /* CONFIG_KERNEL_DEBUGGER */
+
+static inline int debugger_intercept(enum exception_code excep,
+ int signo, int si_code,
+ struct pt_regs *regs)
+{
+ return 0;
+}
+
+static inline int at_debugger_breakpoint(struct pt_regs *regs)
+{
+ return 0;
+}
+
+#endif /* CONFIG_KERNEL_DEBUGGER */
+#endif /* _ASM_DEBUGGER_H */
diff --git a/arch/mn10300/include/asm/div64.h b/arch/mn10300/include/asm/div64.h
index 34dcb8e6830..503efab2a51 100644
--- a/arch/mn10300/include/asm/div64.h
+++ b/arch/mn10300/include/asm/div64.h
@@ -16,6 +16,19 @@
extern void ____unhandled_size_in_do_div___(void);
/*
+ * Beginning with gcc 4.6, the MDR register is represented explicitly. We
+ * must, therefore, at least explicitly clobber the register when we make
+ * changes to it. The following assembly fragments *could* be rearranged in
+ * order to leave the moves to/from the MDR register to the compiler, but the
+ * gains would be minimal at best.
+ */
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
+# define CLOBBER_MDR_CC "mdr", "cc"
+#else
+# define CLOBBER_MDR_CC "cc"
+#endif
+
+/*
* divide n by base, leaving the result in n and returning the remainder
* - we can do this quite efficiently on the MN10300 by cascading the divides
* through the MDR register
@@ -29,7 +42,7 @@ extern void ____unhandled_size_in_do_div___(void);
"mov mdr,%1 \n" \
: "+r"(n), "=d"(__rem) \
: "r"(base), "1"(__rem) \
- : "cc" \
+ : CLOBBER_MDR_CC \
); \
} else if (sizeof(n) <= 8) { \
union { \
@@ -48,7 +61,7 @@ extern void ____unhandled_size_in_do_div___(void);
: "=d"(__rem), "=r"(__quot.w[1]), "=r"(__quot.w[0]) \
: "r"(base), "0"(__rem), "1"(__quot.w[1]), \
"2"(__quot.w[0]) \
- : "cc" \
+ : CLOBBER_MDR_CC \
); \
n = __quot.l; \
} else { \
@@ -72,7 +85,7 @@ unsigned __muldiv64u(unsigned val, unsigned mult, unsigned div)
* MDR = MDR:val%div */
: "=r"(result)
: "0"(val), "ir"(mult), "r"(div)
- : "cc"
+ : CLOBBER_MDR_CC
);
return result;
@@ -93,7 +106,7 @@ signed __muldiv64s(signed val, signed mult, signed div)
* MDR = MDR:val%div */
: "=r"(result)
: "0"(val), "ir"(mult), "r"(div)
- : "cc"
+ : CLOBBER_MDR_CC
);
return result;
diff --git a/arch/mn10300/include/asm/fpu.h b/arch/mn10300/include/asm/fpu.h
index b7625de8ead..738ff72659d 100644
--- a/arch/mn10300/include/asm/fpu.h
+++ b/arch/mn10300/include/asm/fpu.h
@@ -55,7 +55,6 @@ static inline void clear_using_fpu(struct task_struct *tsk)
extern asmlinkage void fpu_kill_state(struct task_struct *);
extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code);
-extern asmlinkage void fpu_invalid_op(struct pt_regs *, enum exception_code);
extern asmlinkage void fpu_init_state(void);
extern asmlinkage void fpu_save(struct fpu_state_struct *);
extern int fpu_setup_sigcontext(struct fpucontext *buf);
@@ -113,7 +112,6 @@ static inline void flush_fpu(void)
extern asmlinkage
void unexpected_fpu_exception(struct pt_regs *, enum exception_code);
-#define fpu_invalid_op unexpected_fpu_exception
#define fpu_exception unexpected_fpu_exception
struct task_struct;
diff --git a/arch/mn10300/include/asm/irqflags.h b/arch/mn10300/include/asm/irqflags.h
index 7a7ae12c711..678f68d5f37 100644
--- a/arch/mn10300/include/asm/irqflags.h
+++ b/arch/mn10300/include/asm/irqflags.h
@@ -20,7 +20,7 @@
/*
* interrupt control
* - "disabled": run in IM1/2
- * - level 0 - GDB stub
+ * - level 0 - kernel debugger
* - level 1 - virtual serial DMA (if present)
* - level 5 - normal interrupt priority
* - level 6 - timer interrupt
diff --git a/arch/mn10300/include/asm/kgdb.h b/arch/mn10300/include/asm/kgdb.h
new file mode 100644
index 00000000000..eb245f18a70
--- /dev/null
+++ b/arch/mn10300/include/asm/kgdb.h
@@ -0,0 +1,81 @@
+/* Kernel debugger for MN10300
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _ASM_KGDB_H
+#define _ASM_KGDB_H
+
+/*
+ * BUFMAX defines the maximum number of characters in inbound/outbound
+ * buffers at least NUMREGBYTES*2 are needed for register packets
+ * Longer buffer is needed to list all threads
+ */
+#define BUFMAX 1024
+
+/*
+ * Note that this register image is in a different order than the register
+ * image that Linux produces at interrupt time.
+ */
+enum regnames {
+ GDB_FR_D0 = 0,
+ GDB_FR_D1 = 1,
+ GDB_FR_D2 = 2,
+ GDB_FR_D3 = 3,
+ GDB_FR_A0 = 4,
+ GDB_FR_A1 = 5,
+ GDB_FR_A2 = 6,
+ GDB_FR_A3 = 7,
+
+ GDB_FR_SP = 8,
+ GDB_FR_PC = 9,
+ GDB_FR_MDR = 10,
+ GDB_FR_EPSW = 11,
+ GDB_FR_LIR = 12,
+ GDB_FR_LAR = 13,
+ GDB_FR_MDRQ = 14,
+
+ GDB_FR_E0 = 15,
+ GDB_FR_E1 = 16,
+ GDB_FR_E2 = 17,
+ GDB_FR_E3 = 18,
+ GDB_FR_E4 = 19,
+ GDB_FR_E5 = 20,
+ GDB_FR_E6 = 21,
+ GDB_FR_E7 = 22,
+
+ GDB_FR_SSP = 23,
+ GDB_FR_MSP = 24,
+ GDB_FR_USP = 25,
+ GDB_FR_MCRH = 26,
+ GDB_FR_MCRL = 27,
+ GDB_FR_MCVF = 28,
+
+ GDB_FR_FPCR = 29,
+ GDB_FR_DUMMY0 = 30,
+ GDB_FR_DUMMY1 = 31,
+
+ GDB_FR_FS0 = 32,
+
+ GDB_FR_SIZE = 64,
+};
+
+#define GDB_ORIG_D0 41
+#define NUMREGBYTES (GDB_FR_SIZE*4)
+
+static inline void arch_kgdb_breakpoint(void)
+{
+ asm(".globl __arch_kgdb_breakpoint; __arch_kgdb_breakpoint: break");
+}
+extern u8 __arch_kgdb_breakpoint;
+
+#define BREAK_INSTR_SIZE 1
+#define CACHE_FLUSH_IS_SAFE 1
+
+#endif /* _ASM_KGDB_H */
diff --git a/arch/mn10300/include/asm/smp.h b/arch/mn10300/include/asm/smp.h
index a3930e43a95..6745dbe6494 100644
--- a/arch/mn10300/include/asm/smp.h
+++ b/arch/mn10300/include/asm/smp.h
@@ -34,7 +34,7 @@
#define LOCAL_TIMER_IPI 193
#define FLUSH_CACHE_IPI 194
#define CALL_FUNCTION_NMI_IPI 195
-#define GDB_NMI_IPI 196
+#define DEBUGGER_NMI_IPI 196
#define SMP_BOOT_IRQ 195
@@ -43,6 +43,7 @@
#define LOCAL_TIMER_GxICR_LV GxICR_LEVEL_4
#define FLUSH_CACHE_GxICR_LV GxICR_LEVEL_0
#define SMP_BOOT_GxICR_LV GxICR_LEVEL_0
+#define DEBUGGER_GxICR_LV CONFIG_DEBUGGER_IRQ_LEVEL
#define TIME_OUT_COUNT_BOOT_IPI 100
#define DELAY_TIME_BOOT_IPI 75000
@@ -61,8 +62,9 @@
* An alternate way of dealing with this could be to use the EPSW.S bits to
* cache this information for systems with up to four CPUs.
*/
+#define arch_smp_processor_id() (CPUID)
#if 0
-#define raw_smp_processor_id() (CPUID)
+#define raw_smp_processor_id() (arch_smp_processor_id())
#else
#define raw_smp_processor_id() (current_thread_info()->cpu)
#endif
diff --git a/arch/mn10300/include/asm/thread_info.h b/arch/mn10300/include/asm/thread_info.h
index 8d53f09c878..87c213002d4 100644
--- a/arch/mn10300/include/asm/thread_info.h
+++ b/arch/mn10300/include/asm/thread_info.h
@@ -131,7 +131,11 @@ static inline unsigned long current_stack_pointer(void)
kmalloc_node(THREAD_SIZE, GFP_KERNEL, node)
#endif
+#ifndef CONFIG_KGDB
#define free_thread_info(ti) kfree((ti))
+#else
+extern void free_thread_info(struct thread_info *);
+#endif
#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)