AltiVec register ptrace support

Jason R Thorpe thorpej at
Sat Dec 15 06:16:20 EST 2001

On Fri, Dec 14, 2001 at 12:52:33PM -0600, Kumar Gala wrote:

 > Is there any reason that we can not spport both methods.  There are
 > applications in which having the ability to get all the registers is a
 > single syscall is a major performance improvement.

I'll chime in...

Other systems that support ptrace(2) don't have PEEK/POKE/READ_U/WRITE_U

I'm currently working on AltiVec for NetBSD/powerpc, and ptrace(2) interface
for AltiVec is going to look like:


...both of which using the following structure as an argument:

	struct vreg {
		uint32_t vreg[32][4];	/* vector register contents */
		register_t vscr;	/* vector status and control reg */
		register_t vrsave;	/* SPR 238 */

This is consistent with how e.g. SSE/SSE2 registers are handled on

        -- Jason R. Thorpe <thorpej at>

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