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powerpc/ptrace: Give ptrace(2) access to SPE registers when available

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SPE registers are already exported in core dumps with the VMX note, so use
the same interface for live access.

Instead of simply guarding out in #ifndef __SPE__ the cpu_feature check, I
chose to keep the check and check against PPC_FEATURE_SPE, on the off-chance
someone decides to run a SPE kernel on a non-SPE device (which is possible,
though highly unlikely, and would be no different from running a MPC85XX
kernel in that instance).
This commit is contained in:
Justin Hibbits 2019-11-22 04:34:46 +00:00
parent 14eff785e8
commit e988a68e5a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=354990
1 changed files with 8 additions and 2 deletions
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10
sys/powerpc/powerpc/ptrace_machdep.c
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@ -40,6 +40,12 @@ __FBSDID("$FreeBSD$");
#include <machine/md_var.h>
#include <machine/pcb.h>
#ifdef __SPE__
#define PPC_FEATURE_VECTOR PPC_FEATURE_HAS_SPE
#else
#define PPC_FEATURE_VECTOR PPC_FEATURE_HAS_ALTIVEC
#endif
int
cpu_ptrace(struct thread *td, int req, void *addr, int data)
{
@ -58,7 +64,7 @@ cpu_ptrace(struct thread *td, int req, void *addr, int data)
error = EINVAL;
switch (req) {
case PT_GETVRREGS:
if (!(cpu_features & PPC_FEATURE_HAS_ALTIVEC))
if (!(cpu_features & PPC_FEATURE_VECTOR))
break;
if (pcb->pcb_flags & PCB_VEC) {
@ -68,7 +74,7 @@ cpu_ptrace(struct thread *td, int req, void *addr, int data)
error = copyout(&vec, addr, sizeof(vec));
break;
case PT_SETVRREGS:
if (!(cpu_features & PPC_FEATURE_HAS_ALTIVEC))
if (!(cpu_features & PPC_FEATURE_VECTOR))
break;
error = copyin(addr, &vec, sizeof(vec));
if (error == 0) {