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Code Issues Releases Activity

Add support for dtrace:fbt on modules for PowerPC

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Summary:
Revert the initial FBT-with-KDB changes for trap_subr*.S, and instead use the
db_trap filter function to handle dtrace trap filtering.  With this, the MMU is
enabled by the support code, simplifying the codepath altogether.

Test Plan: Tested on my G4 PowerBook

Reviewers: #powerpc, nwhitehorn

Reviewed By: nwhitehorn

Differential Revision: https://reviews.freebsd.org/D1207

MFC after:	3 weeks
This commit is contained in:
Justin Hibbits 2014-11-29 20:54:33 +00:00
parent b643b9341c
commit a8920f67f3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=275268
5 changed files with 14 additions and 32 deletions
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4
sys/powerpc/aim/machdep.c
View File

@ -757,6 +757,10 @@ db_trap_glue(struct trapframe *frame)
|| frame->exc == EXC_BPT
|| frame->exc == EXC_DSI)) {
int type = frame->exc;
/* Ignore DTrace traps. */
if (*(uint32_t *)frame->srr0 == EXC_DTRACE)
return (0);
if (type == EXC_PGM && (frame->srr1 & 0x20000)) {
type = T_BREAKPOINT;
}

5
sys/powerpc/aim/trap.c
View File

@ -258,7 +258,8 @@ trap(struct trapframe *frame)
if (frame->srr1 & EXC_PGM_TRAP) {
#ifdef KDTRACE_HOOKS
inst = fuword32((const void *)frame->srr0);
if (inst == 0x0FFFDDDD && dtrace_pid_probe_ptr != NULL) {
if (inst == 0x0FFFDDDD &&
dtrace_pid_probe_ptr != NULL) {
struct reg regs;
fill_regs(td, &regs);
(*dtrace_pid_probe_ptr)(&regs);
@ -301,7 +302,7 @@ trap(struct trapframe *frame)
#ifdef KDTRACE_HOOKS
case EXC_PGM:
if (frame->srr1 & EXC_PGM_TRAP) {
if (*(uint32_t *)frame->srr0 == 0x7c810808) {
if (*(uint32_t *)frame->srr0 == EXC_DTRACE) {
if (dtrace_invop_jump_addr != NULL) {
dtrace_invop_jump_addr(frame);
return;

17
sys/powerpc/aim/trap_subr32.S
View File

@ -890,8 +890,7 @@ CNAME(dblow):
mfcr %r29 /* save CR in r29 */
mfsrr1 %r1
mtcr %r1
bf 17,2f /* branch if privileged */
1:
bf 17,1f /* branch if privileged */
/* Unprivileged case */
mtcr %r29 /* put the condition register back */
mfsprg2 %r29 /* ... and r29 */
@ -900,19 +899,7 @@ CNAME(dblow):
li %r1, 0 /* How to get the vector from LR */
bla generictrap /* and we look like a generic trap */
2:
#ifdef KDTRACE_HOOKS
/* Privileged, so drop to KDB */
mfsrr0 %r1
mtsprg3 %r3
lwz %r1,0(%r1)
/* Check if it's a DTrace trap. */
li %r3,0x0808
addis %r3,%r3,0x7c81
cmplw %cr0,%r3,%r1
mfsprg3 %r3
beq %cr0,1b
#endif
1:
/* Privileged, so drop to KDB */
GET_CPUINFO(%r1)
stw %r28,(PC_DBSAVE+CPUSAVE_R28)(%r1) /* free r28 */

17
sys/powerpc/aim/trap_subr64.S
View File

@ -799,9 +799,8 @@ CNAME(dblow):
mfcr %r29 /* save CR in r29 */
mfsrr1 %r1
mtcr %r1
bf 17,2f /* branch if privileged */
bf 17,1f /* branch if privileged */
1:
/* Unprivileged case */
mtcr %r29 /* put the condition register back */
mfsprg2 %r29 /* ... and r29 */
@ -810,19 +809,7 @@ CNAME(dblow):
li %r1, 0 /* How to get the vector from LR */
bla generictrap /* and we look like a generic trap */
2:
#ifdef KDTRACE_HOOKS
/* Privileged, so drop to KDB */
mfsrr0 %r1
mtsprg3 %r3
lwz %r1,0(%r1)
/* Check if it's a DTrace trap. */
li %r3,0x0808
addis %r3,%r3,0x7c81
cmplw %cr0,%r3,%r1
mfsprg3 %r3
beq %cr0,1b
#endif
1:
GET_CPUINFO(%r1)
std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r1) /* free r27 */
std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r1) /* free r28 */

3
sys/powerpc/include/trap.h
View File

@ -120,6 +120,9 @@
#define EXC_PGM_PRIV (1UL << 18)
#define EXC_PGM_TRAP (1UL << 17)
/* DTrace trap opcode. */
#define EXC_DTRACE 0x7c810808
#ifndef LOCORE
struct trapframe;
struct pcb;