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@@ -1,6 +1,8 @@
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#ifndef __ASM_SH_PTRACE_H
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#define __ASM_SH_PTRACE_H
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+#include <linux/stringify.h>
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+
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/*
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* Copyright (C) 1999, 2000 Niibe Yutaka
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*
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@@ -14,6 +16,13 @@ struct pt_regs {
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unsigned long long tregs[8];
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unsigned long long pad[2];
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};
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+
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+#define MAX_REG_OFFSET offsetof(struct pt_regs, tregs[7])
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+#define regs_return_value(regs) ((regs)->regs[3])
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+
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+#define TREGS_OFFSET_NAME(num) \
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+ {.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])}
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+
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#else
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/*
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* GCC defines register number like this:
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@@ -66,6 +75,9 @@ struct pt_regs {
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long tra;
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};
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+#define MAX_REG_OFFSET offsetof(struct pt_regs, tra)
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+#define regs_return_value(regs) ((regs)->regs[0])
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+
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/*
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* This struct defines the way the DSP registers are stored on the
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* kernel stack during a system call or other kernel entry.
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@@ -113,16 +125,87 @@ struct pt_dspregs {
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#include <asm/system.h>
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#define user_mode(regs) (((regs)->sr & 0x40000000)==0)
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+#define user_stack_pointer(regs) ((unsigned long)(regs)->regs[15])
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+#define kernel_stack_pointer(regs) ((unsigned long)(regs)->regs[15])
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#define instruction_pointer(regs) ((unsigned long)(regs)->pc)
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extern void show_regs(struct pt_regs *);
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+#define arch_has_single_step() (1)
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+
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/*
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- * These are defined as per linux/ptrace.h.
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+ * kprobe-based event tracer support
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*/
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-struct task_struct;
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+#include <linux/stddef.h>
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+#include <linux/thread_info.h>
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-#define arch_has_single_step() (1)
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+struct pt_regs_offset {
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+ const char *name;
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+ int offset;
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+};
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+
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+#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
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+#define REGS_OFFSET_NAME(num) \
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+ {.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])}
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+#define REG_OFFSET_END {.name = NULL, .offset = 0}
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+
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+/* Query offset/name of register from its name/offset */
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+extern int regs_query_register_offset(const char *name);
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+extern const char *regs_query_register_name(unsigned int offset);
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+
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+extern const struct pt_regs_offset regoffset_table[];
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+
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+/**
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+ * regs_get_register() - get register value from its offset
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+ * @regs: pt_regs from which register value is gotten.
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+ * @offset: offset number of the register.
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+ *
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+ * regs_get_register returns the value of a register. The @offset is the
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+ * offset of the register in struct pt_regs address which specified by @regs.
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+ * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
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+ */
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+static inline unsigned long regs_get_register(struct pt_regs *regs,
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+ unsigned int offset)
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+{
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+ if (unlikely(offset > MAX_REG_OFFSET))
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+ return 0;
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+ return *(unsigned long *)((unsigned long)regs + offset);
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+}
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+
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+/**
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+ * regs_within_kernel_stack() - check the address in the stack
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+ * @regs: pt_regs which contains kernel stack pointer.
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+ * @addr: address which is checked.
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+ *
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+ * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
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+ * If @addr is within the kernel stack, it returns true. If not, returns false.
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+ */
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+static inline int regs_within_kernel_stack(struct pt_regs *regs,
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+ unsigned long addr)
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+{
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+ return ((addr & ~(THREAD_SIZE - 1)) ==
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+ (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
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+}
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+
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+/**
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+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
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+ * @regs: pt_regs which contains kernel stack pointer.
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+ * @n: stack entry number.
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+ *
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+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
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+ * is specified by @regs. If the @n th entry is NOT in the kernel stack,
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+ * this returns 0.
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+ */
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+static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
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+ unsigned int n)
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+{
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+ unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
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+ addr += n;
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+ if (regs_within_kernel_stack(regs, (unsigned long)addr))
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+ return *addr;
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+ else
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+ return 0;
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+}
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struct perf_event;
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struct perf_sample_data;
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Paul Mundt