Commit-ID: eaaaeef392cb245e415c31d480ed2d5a466fd88f
Gitweb: http://git.kernel.org/tip/eaaaeef392cb245e415c31d480ed2d5a466fd88f
Author: Paul Mundt <lethal@xxxxxxxxxxxx>
AuthorDate: Mon, 14 Jun 2010 15:16:53 +0900
Committer: Paul Mundt <lethal@xxxxxxxxxxxx>
CommitDate: Mon, 14 Jun 2010 15:16:53 +0900
sh: Add kprobe-based event tracer.
This follows the x86/ppc changes for kprobe-based event tracing on sh.
While kprobes is only supported on 32-bit sh, we provide the API for
HAVE_REGS_AND_STACK_ACCESS_API for both 32 and 64-bit.
Signed-off-by: Paul Mundt <lethal@xxxxxxxxxxxx>
---
arch/sh/Kconfig | 1 +
arch/sh/include/asm/kprobes.h | 1 -
arch/sh/include/asm/processor_32.h | 3 -
arch/sh/include/asm/processor_64.h | 3 -
arch/sh/include/asm/ptrace.h | 89 ++++++++++++++++++++++++++++++++++-
arch/sh/kernel/Makefile | 2 +-
arch/sh/kernel/ptrace.c | 33 +++++++++++++
arch/sh/kernel/ptrace_32.c | 27 +++++++++++
arch/sh/kernel/ptrace_64.c | 79 ++++++++++++++++++++++++++++++++
9 files changed, 227 insertions(+), 11 deletions(-)
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 573fca1..e6b1f20 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -23,6 +23,7 @@ config SUPERH
select HAVE_KERNEL_LZMA
select HAVE_KERNEL_LZO
select HAVE_SYSCALL_TRACEPOINTS
+ select HAVE_REGS_AND_STACK_ACCESS_API
select RTC_LIB
select GENERIC_ATOMIC64
help
diff --git a/arch/sh/include/asm/kprobes.h b/arch/sh/include/asm/kprobes.h
index 036c331..134f398 100644
--- a/arch/sh/include/asm/kprobes.h
+++ b/arch/sh/include/asm/kprobes.h
@@ -16,7 +16,6 @@ typedef insn_size_t kprobe_opcode_t;
? (MAX_STACK_SIZE) \
: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
-#define regs_return_value(_regs) ((_regs)->regs[0])
#define flush_insn_slot(p) do { } while (0)
#define kretprobe_blacklist_size 0
diff --git a/arch/sh/include/asm/processor_32.h b/arch/sh/include/asm/processor_32.h
index 61a445d..46d5179 100644
--- a/arch/sh/include/asm/processor_32.h
+++ b/arch/sh/include/asm/processor_32.h
@@ -13,7 +13,6 @@
#include <linux/linkage.h>
#include <asm/page.h>
#include <asm/types.h>
-#include <asm/ptrace.h>
#include <asm/hw_breakpoint.h>
/*
@@ -194,8 +193,6 @@ extern unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
-#define user_stack_pointer(_regs) ((_regs)->regs[15])
-
#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
#define PREFETCH_STRIDE L1_CACHE_BYTES
#define ARCH_HAS_PREFETCH
diff --git a/arch/sh/include/asm/processor_64.h b/arch/sh/include/asm/processor_64.h
index 621bc46..2a541dd 100644
--- a/arch/sh/include/asm/processor_64.h
+++ b/arch/sh/include/asm/processor_64.h
@@ -17,7 +17,6 @@
#include <linux/compiler.h>
#include <asm/page.h>
#include <asm/types.h>
-#include <asm/ptrace.h>
#include <cpu/registers.h>
/*
@@ -231,7 +230,5 @@ extern unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) ((tsk)->thread.pc)
#define KSTK_ESP(tsk) ((tsk)->thread.sp)
-#define user_stack_pointer(_regs) ((_regs)->regs[15])
-
#endif /* __ASSEMBLY__ */
#endif /* __ASM_SH_PROCESSOR_64_H */
diff --git a/arch/sh/include/asm/ptrace.h b/arch/sh/include/asm/ptrace.h
index 2168fde..33b3f37 100644
--- a/arch/sh/include/asm/ptrace.h
+++ b/arch/sh/include/asm/ptrace.h
@@ -1,6 +1,8 @@
#ifndef __ASM_SH_PTRACE_H
#define __ASM_SH_PTRACE_H
+#include <linux/stringify.h>
+
/*
* Copyright (C) 1999, 2000 Niibe Yutaka
*
@@ -14,6 +16,13 @@ struct pt_regs {
unsigned long long tregs[8];
unsigned long long pad[2];
};
+
+#define MAX_REG_OFFSET offsetof(struct pt_regs, tregs[7])
+#define regs_return_value(regs) ((regs)->regs[3])
+
+#define TREGS_OFFSET_NAME(num) \
+ {.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])}
+
#else
/*
* GCC defines register number like this:
@@ -66,6 +75,9 @@ struct pt_regs {
long tra;
};
+#define MAX_REG_OFFSET offsetof(struct pt_regs, tra)
+#define regs_return_value(regs) ((regs)->regs[0])
+
/*
* This struct defines the way the DSP registers are stored on the
* kernel stack during a system call or other kernel entry.
@@ -113,16 +125,87 @@ struct pt_dspregs {
#include <asm/system.h>
#define user_mode(regs) (((regs)->sr & 0x40000000)==0)
+#define user_stack_pointer(regs) ((unsigned long)(regs)->regs[15])
+#define kernel_stack_pointer(regs) ((unsigned long)(regs)->regs[15])
#define instruction_pointer(regs) ((unsigned long)(regs)->pc)
extern void show_regs(struct pt_regs *);
+#define arch_has_single_step() (1)
+
/*
- * These are defined as per linux/ptrace.h.
+ * kprobe-based event tracer support
*/
-struct task_struct;
+#include <linux/stddef.h>
+#include <linux/thread_info.h>
-#define arch_has_single_step() (1)
+struct pt_regs_offset {
+ const char *name;
+ int offset;
+};
+
+#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
+#define REGS_OFFSET_NAME(num) \
+ {.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])}
+#define REG_OFFSET_END {.name = NULL, .offset = 0}
+
+/* Query offset/name of register from its name/offset */
+extern int regs_query_register_offset(const char *name);
+extern const char *regs_query_register_name(unsigned int offset);
+
+extern const struct pt_regs_offset regoffset_table[];
+
+/**
+ * regs_get_register() - get register value from its offset
+ * @regs: pt_regs from which register value is gotten.
+ * @offset: offset number of the register.
+ *
+ * regs_get_register returns the value of a register. The @offset is the
+ * offset of the register in struct pt_regs address which specified by @regs.
+ * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
+ */
+static inline unsigned long regs_get_register(struct pt_regs *regs,
+ unsigned int offset)
+{
+ if (unlikely(offset > MAX_REG_OFFSET))
+ return 0;
+ return *(unsigned long *)((unsigned long)regs + offset);
+}
+
+/**
+ * regs_within_kernel_stack() - check the address in the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @addr: address which is checked.
+ *
+ * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
+ * If @addr is within the kernel stack, it returns true. If not, returns false.
+ */
+static inline int regs_within_kernel_stack(struct pt_regs *regs,
+ unsigned long addr)
+{
+ return ((addr & ~(THREAD_SIZE - 1)) ==
+ (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
+}
+
+/**
+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @n: stack entry number.
+ *
+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
+ * is specified by @regs. If the @n th entry is NOT in the kernel stack,
+ * this returns 0.
+ */
+static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
+ unsigned int n)
+{
+ unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
+ addr += n;
+ if (regs_within_kernel_stack(regs, (unsigned long)addr))
+ return *addr;
+ else
+ return 0;
+}
struct perf_event;
struct perf_sample_data;
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index e25f3c6..1086ba1 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -14,7 +14,7 @@ CFLAGS_REMOVE_return_address.o = -pg
obj-y := clkdev.o debugtraps.o dma-nommu.o dumpstack.o \
idle.o io.o irq.o \
irq_$(BITS).o machvec.o nmi_debug.o process.o \
- process_$(BITS).o ptrace_$(BITS).o \
+ process_$(BITS).o ptrace.o ptrace_$(BITS).o \
reboot.o return_address.o \
setup.o signal_$(BITS).o sys_sh.o sys_sh$(BITS).o \
syscalls_$(BITS).o time.o topology.o traps.o \
diff --git a/arch/sh/kernel/ptrace.c b/arch/sh/kernel/ptrace.c
new file mode 100644
index 0000000..0a05983
--- /dev/null
+++ b/arch/sh/kernel/ptrace.c
@@ -0,0 +1,33 @@
+#include <linux/ptrace.h>
+
+/**
+ * regs_query_register_offset() - query register offset from its name
+ * @name: the name of a register
+ *
+ * regs_query_register_offset() returns the offset of a register in struct
+ * pt_regs from its name. If the name is invalid, this returns -EINVAL;
+ */
+int regs_query_register_offset(const char *name)
+{
+ const struct pt_regs_offset *roff;
+ for (roff = regoffset_table; roff->name != NULL; roff++)
+ if (!strcmp(roff->name, name))
+ return roff->offset;
+ return -EINVAL;
+}
+
+/**
+ * regs_query_register_name() - query register name from its offset
+ * @offset: the offset of a register in struct pt_regs.
+ *
+ * regs_query_register_name() returns the name of a register from its
+ * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
+ */
+const char *regs_query_register_name(unsigned int offset)
+{
+ const struct pt_regs_offset *roff;
+ for (roff = regoffset_table; roff->name != NULL; roff++)
+ if (roff->offset == offset)
+ return roff->name;
+ return NULL;
+}
diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c
index 6c4bbba..2cd42b5 100644
--- a/arch/sh/kernel/ptrace_32.c
+++ b/arch/sh/kernel/ptrace_32.c
@@ -274,6 +274,33 @@ static int dspregs_active(struct task_struct *target,
}
#endif
+const struct pt_regs_offset regoffset_table[] = {
+ REGS_OFFSET_NAME(0),
+ REGS_OFFSET_NAME(1),
+ REGS_OFFSET_NAME(2),
+ REGS_OFFSET_NAME(3),
+ REGS_OFFSET_NAME(4),
+ REGS_OFFSET_NAME(5),
+ REGS_OFFSET_NAME(6),
+ REGS_OFFSET_NAME(7),
+ REGS_OFFSET_NAME(8),
+ REGS_OFFSET_NAME(9),
+ REGS_OFFSET_NAME(10),
+ REGS_OFFSET_NAME(11),
+ REGS_OFFSET_NAME(12),
+ REGS_OFFSET_NAME(13),
+ REGS_OFFSET_NAME(14),
+ REGS_OFFSET_NAME(15),
+ REG_OFFSET_NAME(pc),
+ REG_OFFSET_NAME(pr),
+ REG_OFFSET_NAME(sr),
+ REG_OFFSET_NAME(gbr),
+ REG_OFFSET_NAME(mach),
+ REG_OFFSET_NAME(macl),
+ REG_OFFSET_NAME(tra),
+ REG_OFFSET_END,
+};
+
/*
* These are our native regset flavours.
*/
diff --git a/arch/sh/kernel/ptrace_64.c b/arch/sh/kernel/ptrace_64.c
index 5fd644d..b978170 100644
--- a/arch/sh/kernel/ptrace_64.c
+++ b/arch/sh/kernel/ptrace_64.c
@@ -252,6 +252,85 @@ static int fpregs_active(struct task_struct *target,
}
#endif
+const struct pt_regs_offset regoffset_table[] = {
+ REG_OFFSET_NAME(pc),
+ REG_OFFSET_NAME(sr),
+ REG_OFFSET_NAME(syscall_nr),
+ REGS_OFFSET_NAME(0),
+ REGS_OFFSET_NAME(1),
+ REGS_OFFSET_NAME(2),
+ REGS_OFFSET_NAME(3),
+ REGS_OFFSET_NAME(4),
+ REGS_OFFSET_NAME(5),
+ REGS_OFFSET_NAME(6),
+ REGS_OFFSET_NAME(7),
+ REGS_OFFSET_NAME(8),
+ REGS_OFFSET_NAME(9),
+ REGS_OFFSET_NAME(10),
+ REGS_OFFSET_NAME(11),
+ REGS_OFFSET_NAME(12),
+ REGS_OFFSET_NAME(13),
+ REGS_OFFSET_NAME(14),
+ REGS_OFFSET_NAME(15),
+ REGS_OFFSET_NAME(16),
+ REGS_OFFSET_NAME(17),
+ REGS_OFFSET_NAME(18),
+ REGS_OFFSET_NAME(19),
+ REGS_OFFSET_NAME(20),
+ REGS_OFFSET_NAME(21),
+ REGS_OFFSET_NAME(22),
+ REGS_OFFSET_NAME(23),
+ REGS_OFFSET_NAME(24),
+ REGS_OFFSET_NAME(25),
+ REGS_OFFSET_NAME(26),
+ REGS_OFFSET_NAME(27),
+ REGS_OFFSET_NAME(28),
+ REGS_OFFSET_NAME(29),
+ REGS_OFFSET_NAME(30),
+ REGS_OFFSET_NAME(31),
+ REGS_OFFSET_NAME(32),
+ REGS_OFFSET_NAME(33),
+ REGS_OFFSET_NAME(34),
+ REGS_OFFSET_NAME(35),
+ REGS_OFFSET_NAME(36),
+ REGS_OFFSET_NAME(37),
+ REGS_OFFSET_NAME(38),
+ REGS_OFFSET_NAME(39),
+ REGS_OFFSET_NAME(40),
+ REGS_OFFSET_NAME(41),
+ REGS_OFFSET_NAME(42),
+ REGS_OFFSET_NAME(43),
+ REGS_OFFSET_NAME(44),
+ REGS_OFFSET_NAME(45),
+ REGS_OFFSET_NAME(46),
+ REGS_OFFSET_NAME(47),
+ REGS_OFFSET_NAME(48),
+ REGS_OFFSET_NAME(49),
+ REGS_OFFSET_NAME(50),
+ REGS_OFFSET_NAME(51),
+ REGS_OFFSET_NAME(52),
+ REGS_OFFSET_NAME(53),
+ REGS_OFFSET_NAME(54),
+ REGS_OFFSET_NAME(55),
+ REGS_OFFSET_NAME(56),
+ REGS_OFFSET_NAME(57),
+ REGS_OFFSET_NAME(58),
+ REGS_OFFSET_NAME(59),
+ REGS_OFFSET_NAME(60),
+ REGS_OFFSET_NAME(61),
+ REGS_OFFSET_NAME(62),
+ REGS_OFFSET_NAME(63),
+ TREGS_OFFSET_NAME(0),
+ TREGS_OFFSET_NAME(1),
+ TREGS_OFFSET_NAME(2),
+ TREGS_OFFSET_NAME(3),
+ TREGS_OFFSET_NAME(4),
+ TREGS_OFFSET_NAME(5),
+ TREGS_OFFSET_NAME(6),
+ TREGS_OFFSET_NAME(7),
+ REG_OFFSET_END,
+};
+
/*
* These are our native regset flavours.
*/
--
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