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Dump VMX registers into the userland coredump.

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Reviewed by:	nwhitehorn
MFC after:	2 weeks
This commit is contained in:
Justin Hibbits 2015-01-03 21:06:06 +00:00
parent 0d203a6065
commit 7bde2664d6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=276634
4 changed files with 95 additions and 35 deletions
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1
sys/powerpc/include/altivec.h
View File

@ -34,6 +34,7 @@
void enable_vec(struct thread *);
void save_vec(struct thread *);
void save_vec_nodrop(struct thread *);
#endif /* _MACHINE_ALTIVEC_H_ */

87
sys/powerpc/powerpc/altivec.c
View File

@ -43,6 +43,46 @@ __FBSDID("$FreeBSD$");
#include <machine/pcb.h>
#include <machine/psl.h>
static void
save_vec_int(struct thread *td)
{
int msr;
struct pcb *pcb;
pcb = td->td_pcb;
/*
* Temporarily re-enable the vector unit during the save
*/
msr = mfmsr();
mtmsr(msr | PSL_VEC);
isync();
/*
* Save the vector registers and VSCR to the PCB
*/
#define STVX(n) __asm ("stvx %1,0,%0" \
:: "b"(pcb->pcb_vec.vr[n]), "n"(n));
STVX(0); STVX(1); STVX(2); STVX(3);
STVX(4); STVX(5); STVX(6); STVX(7);
STVX(8); STVX(9); STVX(10); STVX(11);
STVX(12); STVX(13); STVX(14); STVX(15);
STVX(16); STVX(17); STVX(18); STVX(19);
STVX(20); STVX(21); STVX(22); STVX(23);
STVX(24); STVX(25); STVX(26); STVX(27);
STVX(28); STVX(29); STVX(30); STVX(31);
#undef STVX
__asm __volatile("mfvscr 0; stvewx 0,0,%0" :: "b"(&pcb->pcb_vec.vscr));
/*
* Disable vector unit again
*/
isync();
mtmsr(msr);
}
void
enable_vec(struct thread *td)
{
@ -107,40 +147,11 @@ enable_vec(struct thread *td)
void
save_vec(struct thread *td)
{
int msr;
struct pcb *pcb;
pcb = td->td_pcb;
/*
* Temporarily re-enable the vector unit during the save
*/
msr = mfmsr();
mtmsr(msr | PSL_VEC);
isync();
/*
* Save the vector registers and VSCR to the PCB
*/
#define STVX(n) __asm ("stvx %1,0,%0" \
:: "b"(pcb->pcb_vec.vr[n]), "n"(n));
STVX(0); STVX(1); STVX(2); STVX(3);
STVX(4); STVX(5); STVX(6); STVX(7);
STVX(8); STVX(9); STVX(10); STVX(11);
STVX(12); STVX(13); STVX(14); STVX(15);
STVX(16); STVX(17); STVX(18); STVX(19);
STVX(20); STVX(21); STVX(22); STVX(23);
STVX(24); STVX(25); STVX(26); STVX(27);
STVX(28); STVX(29); STVX(30); STVX(31);
#undef STVX
__asm __volatile("mfvscr 0; stvewx 0,0,%0" :: "b"(&pcb->pcb_vec.vscr));
/*
* Disable vector unit again
*/
isync();
mtmsr(msr);
save_vec_int(td);
/*
* Clear the current vec thread and pcb's CPU id
@ -150,3 +161,19 @@ save_vec(struct thread *td)
PCPU_SET(vecthread, NULL);
}
/*
* Save altivec state without dropping ownership. This will only save state if
* the current vector-thread is `td'.
*/
void
save_vec_nodrop(struct thread *td)
{
struct thread *vtd;
vtd = PCPU_GET(vecthread);
if (td != vtd) {
return;
}
save_vec_int(td);
}

20
sys/powerpc/powerpc/elf32_machdep.c
View File

@ -47,6 +47,7 @@
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <machine/altivec.h>
#include <machine/cpu.h>
#include <machine/elf.h>
#include <machine/reg.h>
@ -147,9 +148,24 @@ SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
&freebsd_brand_oinfo);
void
elf32_dump_thread(struct thread *td __unused, void *dst __unused,
size_t *off __unused)
elf32_dump_thread(struct thread *td, void *dst, size_t *off)
{
size_t len;
struct pcb *pcb;
len = 0;
pcb = td->td_pcb;
if (pcb->pcb_flags & PCB_VEC) {
save_vec_nodrop(td);
if (dst != NULL) {
len += elf32_populate_note(NT_PPC_VMX,
&pcb->pcb_vec, dst,
sizeof(pcb->pcb_vec), NULL);
} else
len += elf32_populate_note(NT_PPC_VMX, NULL, NULL,
sizeof(pcb->pcb_vec), NULL);
}
*off = len;
}
#ifndef __powerpc64__

20
sys/powerpc/powerpc/elf64_machdep.c
View File

@ -44,6 +44,7 @@
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <machine/altivec.h>
#include <machine/cpu.h>
#include <machine/elf.h>
#include <machine/md_var.h>
@ -119,9 +120,24 @@ SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
&freebsd_brand_oinfo);
void
elf64_dump_thread(struct thread *td __unused, void *dst __unused,
size_t *off __unused)
elf64_dump_thread(struct thread *td, void *dst, size_t *off)
{
size_t len;
struct pcb *pcb;
len = 0;
pcb = td->td_pcb;
if (pcb->pcb_flags & PCB_VEC) {
save_vec_nodrop(td);
if (dst != NULL) {
len += elf64_populate_note(NT_PPC_VMX,
&pcb->pcb_vec, dst,
sizeof(pcb->pcb_vec), NULL);
} else
len += elf64_populate_note(NT_PPC_VMX, NULL, NULL,
sizeof(pcb->pcb_vec), NULL);
}
*off = len;
}