arch/riscv/kernel/ptrace.c

Source file repositories/reference/linux-study-clean/arch/riscv/kernel/ptrace.c

File Facts

System
Linux kernel
Corpus path
arch/riscv/kernel/ptrace.c
Extension
.c
Size
16745 bytes
Lines
638
Domain
Architecture Layer
Bucket
arch/riscv
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct pt_regs_offset {
	const char *name;
	int offset;
};

#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
#define REG_OFFSET_END {.name = NULL, .offset = 0}

static const struct pt_regs_offset regoffset_table[] = {
	REG_OFFSET_NAME(epc),
	REG_OFFSET_NAME(ra),
	REG_OFFSET_NAME(sp),
	REG_OFFSET_NAME(gp),
	REG_OFFSET_NAME(tp),
	REG_OFFSET_NAME(t0),
	REG_OFFSET_NAME(t1),
	REG_OFFSET_NAME(t2),
	REG_OFFSET_NAME(s0),
	REG_OFFSET_NAME(s1),
	REG_OFFSET_NAME(a0),
	REG_OFFSET_NAME(a1),
	REG_OFFSET_NAME(a2),
	REG_OFFSET_NAME(a3),
	REG_OFFSET_NAME(a4),
	REG_OFFSET_NAME(a5),
	REG_OFFSET_NAME(a6),
	REG_OFFSET_NAME(a7),
	REG_OFFSET_NAME(s2),
	REG_OFFSET_NAME(s3),
	REG_OFFSET_NAME(s4),
	REG_OFFSET_NAME(s5),
	REG_OFFSET_NAME(s6),
	REG_OFFSET_NAME(s7),
	REG_OFFSET_NAME(s8),
	REG_OFFSET_NAME(s9),
	REG_OFFSET_NAME(s10),
	REG_OFFSET_NAME(s11),
	REG_OFFSET_NAME(t3),
	REG_OFFSET_NAME(t4),
	REG_OFFSET_NAME(t5),
	REG_OFFSET_NAME(t6),
	REG_OFFSET_NAME(status),
	REG_OFFSET_NAME(badaddr),
	REG_OFFSET_NAME(cause),
	REG_OFFSET_NAME(orig_a0),
	REG_OFFSET_END,
};

/**
 * 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_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 bool 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.
 */
unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
{

Annotation

Implementation Notes