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Commit 962bca7f authored by Robert Jennings's avatar Robert Jennings Committed by Paul Mackerras
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[PATCH] ppc64: Add PTRACE_{GET|SET}VRREGS 



The ptrace get and set methods for VMX/Altivec registers present in the
ppc tree were missing for ppc64.  This patch adds the 32-bit and
64-bit methods.  Updated with the suggestions from Anton following the lines
of his code snippet.

Added:
 - flush_altivec_to_thread calls as suggested by Anton
 - piecewise copy of structure to preserve 32-bit vrsave data as per
   Anton

(I consolidated the 32 and 64bit versions with 2 helper macros - Anton)

Signed-off-by: default avatarRobert C Jennings <rcjenn@austin.ibm.com>
Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 4267292b

arch/ppc64/kernel/ptrace.c

+15 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
 * this archive for more details.

 */



#include <linux/config.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/mm.h>
@@ -274,6 +275,20 @@ int sys_ptrace(long request, long pid, long addr, long data) 
		break;

	}



#ifdef CONFIG_ALTIVEC

	case PTRACE_GETVRREGS:

		/* Get the child altivec register state. */

		flush_altivec_to_thread(child);

		ret = get_vrregs((unsigned long __user *)data, child);

		break;



	case PTRACE_SETVRREGS:

		/* Set the child altivec register state. */

		flush_altivec_to_thread(child);

		ret = set_vrregs(child, (unsigned long __user *)data);

		break;

#endif



	default:

		ret = ptrace_request(child, request, addr, data);

		break;

arch/ppc64/kernel/ptrace32.c

+15 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
 * this archive for more details.

 */



#include <linux/config.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/mm.h>
@@ -409,6 +410,20 @@ int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data) 
                ret = put_user(child->ptrace_message, (unsigned int __user *) data);

                break;



#ifdef CONFIG_ALTIVEC

	case PTRACE_GETVRREGS:

		/* Get the child altivec register state. */

		flush_altivec_to_thread(child);

		ret = get_vrregs((unsigned long __user *)data, child);

		break;



	case PTRACE_SETVRREGS:

		/* Set the child altivec register state. */

		flush_altivec_to_thread(child);

		ret = set_vrregs(child, (unsigned long __user *)data);

		break;

#endif



	default:

		ret = ptrace_request(child, request, addr, data);

		break;

include/asm-ppc64/ptrace-common.h

+72 −0
Original line number Diff line number Diff line
@@ -11,6 +11,9 @@ 


#ifndef _PPC64_PTRACE_COMMON_H

#define _PPC64_PTRACE_COMMON_H



#include <linux/config.h>



/*

 * Set of msr bits that gdb can change on behalf of a process.

 */
@@ -69,4 +72,73 @@ static inline void clear_single_step(struct task_struct *task) 
	clear_ti_thread_flag(task->thread_info, TIF_SINGLESTEP);

}



#ifdef CONFIG_ALTIVEC

/*

 * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.

 * The transfer totals 34 quadword.  Quadwords 0-31 contain the

 * corresponding vector registers.  Quadword 32 contains the vscr as the

 * last word (offset 12) within that quadword.  Quadword 33 contains the

 * vrsave as the first word (offset 0) within the quadword.

 *

 * This definition of the VMX state is compatible with the current PPC32

 * ptrace interface.  This allows signal handling and ptrace to use the

 * same structures.  This also simplifies the implementation of a bi-arch

 * (combined (32- and 64-bit) gdb.

 */



/*

 * Get contents of AltiVec register state in task TASK

 */

static inline int get_vrregs(unsigned long __user *data,

			     struct task_struct *task)

{

	unsigned long regsize;



	/* copy AltiVec registers VR[0] .. VR[31] */

	regsize = 32 * sizeof(vector128);

	if (copy_to_user(data, task->thread.vr, regsize))

		return -EFAULT;

	data += (regsize / sizeof(unsigned long));



	/* copy VSCR */

	regsize = 1 * sizeof(vector128);

	if (copy_to_user(data, &task->thread.vscr, regsize))

		return -EFAULT;

	data += (regsize / sizeof(unsigned long));



	/* copy VRSAVE */

	if (put_user(task->thread.vrsave, (u32 __user *)data))

		return -EFAULT;



	return 0;

}



/*

 * Write contents of AltiVec register state into task TASK.

 */

static inline int set_vrregs(struct task_struct *task,

			     unsigned long __user *data)

{

	unsigned long regsize;



	/* copy AltiVec registers VR[0] .. VR[31] */

	regsize = 32 * sizeof(vector128);

	if (copy_from_user(task->thread.vr, data, regsize))

		return -EFAULT;

	data += (regsize / sizeof(unsigned long));



	/* copy VSCR */

	regsize = 1 * sizeof(vector128);

	if (copy_from_user(&task->thread.vscr, data, regsize))

		return -EFAULT;

	data += (regsize / sizeof(unsigned long));



	/* copy VRSAVE */

	if (get_user(task->thread.vrsave, (u32 __user *)data))

		return -EFAULT;



	return 0;

}

#endif



#endif /* _PPC64_PTRACE_COMMON_H */