arch/powerpc/kernel/ptrace/ptrace-view.c

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

File Facts

System
Linux kernel
Corpus path
arch/powerpc/kernel/ptrace/ptrace-view.c
Extension
.c
Size
26542 bytes
Lines
947
Domain
Architecture Layer
Bucket
arch/powerpc
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 STR(s)	#s			/* convert to string */
#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
#define GPR_OFFSET_NAME(num)	\
	{.name = STR(r##num), .offset = offsetof(struct pt_regs, gpr[num])}, \
	{.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
#define REG_OFFSET_END {.name = NULL, .offset = 0}

static const struct pt_regs_offset regoffset_table[] = {
	GPR_OFFSET_NAME(0),
	GPR_OFFSET_NAME(1),
	GPR_OFFSET_NAME(2),
	GPR_OFFSET_NAME(3),
	GPR_OFFSET_NAME(4),
	GPR_OFFSET_NAME(5),
	GPR_OFFSET_NAME(6),
	GPR_OFFSET_NAME(7),
	GPR_OFFSET_NAME(8),
	GPR_OFFSET_NAME(9),
	GPR_OFFSET_NAME(10),
	GPR_OFFSET_NAME(11),
	GPR_OFFSET_NAME(12),
	GPR_OFFSET_NAME(13),
	GPR_OFFSET_NAME(14),
	GPR_OFFSET_NAME(15),
	GPR_OFFSET_NAME(16),
	GPR_OFFSET_NAME(17),
	GPR_OFFSET_NAME(18),
	GPR_OFFSET_NAME(19),
	GPR_OFFSET_NAME(20),
	GPR_OFFSET_NAME(21),
	GPR_OFFSET_NAME(22),
	GPR_OFFSET_NAME(23),
	GPR_OFFSET_NAME(24),
	GPR_OFFSET_NAME(25),
	GPR_OFFSET_NAME(26),
	GPR_OFFSET_NAME(27),
	GPR_OFFSET_NAME(28),
	GPR_OFFSET_NAME(29),
	GPR_OFFSET_NAME(30),
	GPR_OFFSET_NAME(31),
	REG_OFFSET_NAME(nip),
	REG_OFFSET_NAME(msr),
	REG_OFFSET_NAME(ctr),
	REG_OFFSET_NAME(link),
	REG_OFFSET_NAME(xer),
	REG_OFFSET_NAME(ccr),
#ifdef CONFIG_PPC64
	REG_OFFSET_NAME(softe),
#else
	REG_OFFSET_NAME(mq),
#endif
	REG_OFFSET_NAME(trap),
	REG_OFFSET_NAME(dar),
	REG_OFFSET_NAME(dsisr),
	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_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)

Annotation

Implementation Notes