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Commit 876d6dcd authored by Paul Clothier's avatar Paul Clothier Committed by James Hogan
Browse files

metag: ptrace: Implement NT_METAG_TLS 



Implement functionality to get the TLS pointer for the metag
architecture using regsets.

This provides multi-threaded debug support for GDB.

Signed-off-by: default avatarPaul Clothier <Paul.Clothier@imgtec.com>
Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
parent 2b8660ed

arch/metag/kernel/ptrace.c

+34 −0
Original line number Diff line number Diff line
@@ -288,10 +288,36 @@ static int metag_rp_state_set(struct task_struct *target, 
	return metag_rp_state_copyin(regs, pos, count, kbuf, ubuf);

}



static int metag_tls_get(struct task_struct *target,

			const struct user_regset *regset,

			unsigned int pos, unsigned int count,

			void *kbuf, void __user *ubuf)

{

	void __user *tls = target->thread.tls_ptr;

	return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);

}



static int metag_tls_set(struct task_struct *target,

			const struct user_regset *regset,

			unsigned int pos, unsigned int count,

			const void *kbuf, const void __user *ubuf)

{

	int ret;

	void __user *tls;



	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);

	if (ret)

		return ret;



	target->thread.tls_ptr = tls;

	return ret;

}



enum metag_regset {

	REGSET_GENERAL,

	REGSET_CBUF,

	REGSET_READPIPE,

	REGSET_TLS,

};



static const struct user_regset metag_regsets[] = {
@@ -319,6 +345,14 @@ static const struct user_regset metag_regsets[] = { 
		.get = metag_rp_state_get,

		.set = metag_rp_state_set,

	},

	[REGSET_TLS] = {

		.core_note_type = NT_METAG_TLS,

		.n = 1,

		.size = sizeof(void *),

		.align = sizeof(void *),

		.get = metag_tls_get,

		.set = metag_tls_set,

	},

};



static const struct user_regset_view user_metag_view = {

include/uapi/linux/elf.h

+1 −0
Original line number Diff line number Diff line
@@ -397,6 +397,7 @@ typedef struct elf64_shdr { 
#define NT_ARM_HW_WATCH	0x403		/* ARM hardware watchpoint registers */

#define NT_METAG_CBUF	0x500		/* Metag catch buffer registers */

#define NT_METAG_RPIPE	0x501		/* Metag read pipeline state */

#define NT_METAG_TLS	0x502		/* Metag TLS pointer */





/* Note header in a PT_NOTE section */