AcoSail/kernel_optimize_test
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parisc: stop using task->ptrace for {single,block}step flags

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task->ptrace flags belong to generic code, so instead thief some
TIF_ bits to use. Somewhat risky conversion of code to test TASK_FLAGS
instead of TASK_PTRACE in assembly, but it looks alright in the end.

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
This commit is contained in:
Kyle McMartin 2009-09-27 23:03:02 -04:00 committed by Kyle McMartin
parent 2798af1abb
commit ecd3d4bc06
4 changed files with 25 additions and 18 deletions
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4
arch/parisc/include/asm/thread_info.h
View File

@ -60,6 +60,8 @@ struct thread_info {
#define TIF_RESTORE_SIGMASK 6 /* restore saved signal mask */
#define TIF_FREEZE 7 /* is freezing for suspend */
#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
#define TIF_SINGLESTEP 9 /* single stepping? */
#define TIF_BLOCKSTEP 10 /* branch stepping? */
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
@ -69,6 +71,8 @@ struct thread_info {
#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
#define _TIF_FREEZE (1 << TIF_FREEZE)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP)
#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
_TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)

4
arch/parisc/kernel/asm-offsets.c
View File

@ -270,8 +270,8 @@ int main(void)
DEFINE(DTLB_OFF_COUNT, offsetof(struct pdc_cache_info, dt_off_count));
DEFINE(DTLB_LOOP, offsetof(struct pdc_cache_info, dt_loop));
BLANK();
DEFINE(PA_BLOCKSTEP_BIT, 31-PT_BLOCKSTEP_BIT);
DEFINE(PA_SINGLESTEP_BIT, 31-PT_SINGLESTEP_BIT);
DEFINE(TIF_BLOCKSTEP_PA_BIT, 31-TIF_BLOCKSTEP);
DEFINE(TIF_SINGLESTEP_PA_BIT, 31-TIF_SINGLESTEP);
BLANK();
DEFINE(ASM_PMD_SHIFT, PMD_SHIFT);
DEFINE(ASM_PGDIR_SHIFT, PGDIR_SHIFT);

21
arch/parisc/kernel/entry.S
View File

@ -2047,12 +2047,13 @@ syscall_do_signal:
b,n syscall_check_sig
syscall_restore:
/* Are we being ptraced? */
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
ldw TASK_PTRACE(%r1), %r19
bb,< %r19,31,syscall_restore_rfi
nop
/* Are we being ptraced? */
ldw TASK_FLAGS(%r1),%r19
ldi (_TIF_SINGLESTEP|_TIF_BLOCKSTEP),%r2
and,COND(=) %r19,%r2,%r0
b,n syscall_restore_rfi
ldo TASK_PT_FR31(%r1),%r19 /* reload fpregs */
rest_fp %r19
@ -2113,16 +2114,16 @@ syscall_restore_rfi:
ldi 0x0b,%r20 /* Create new PSW */
depi -1,13,1,%r20 /* C, Q, D, and I bits */
/* The values of PA_SINGLESTEP_BIT and PA_BLOCKSTEP_BIT are
* set in include/linux/ptrace.h and converted to PA bitmap
/* The values of SINGLESTEP_BIT and BLOCKSTEP_BIT are
* set in thread_info.h and converted to PA bitmap
* numbers in asm-offsets.c */
/* if ((%r19.PA_SINGLESTEP_BIT)) { %r20.27=1} */
extru,= %r19,PA_SINGLESTEP_BIT,1,%r0
/* if ((%r19.SINGLESTEP_BIT)) { %r20.27=1} */
extru,= %r19,TIF_SINGLESTEP_PA_BIT,1,%r0
depi -1,27,1,%r20 /* R bit */
/* if ((%r19.PA_BLOCKSTEP_BIT)) { %r20.7=1} */
extru,= %r19,PA_BLOCKSTEP_BIT,1,%r0
/* if ((%r19.BLOCKSTEP_BIT)) { %r20.7=1} */
extru,= %r19,TIF_BLOCKSTEP_PA_BIT,1,%r0
depi -1,7,1,%r20 /* T bit */
STREG %r20,TASK_PT_PSW(%r1)

14
arch/parisc/kernel/ptrace.c
View File

@ -36,7 +36,8 @@
*/
void ptrace_disable(struct task_struct *task)
{
task->ptrace &= ~(PT_SINGLESTEP|PT_BLOCKSTEP);
clear_tsk_thread_flag(task, TIF_SINGLESTEP);
clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
/* make sure the trap bits are not set */
pa_psw(task)->r = 0;
@ -56,8 +57,8 @@ void user_disable_single_step(struct task_struct *task)
void user_enable_single_step(struct task_struct *task)
{
task->ptrace &= ~PT_BLOCKSTEP;
task->ptrace |= PT_SINGLESTEP;
clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
set_tsk_thread_flag(task, TIF_SINGLESTEP);
if (pa_psw(task)->n) {
struct siginfo si;
@ -99,8 +100,8 @@ void user_enable_single_step(struct task_struct *task)
void user_enable_block_step(struct task_struct *task)
{
task->ptrace &= ~PT_SINGLESTEP;
task->ptrace |= PT_BLOCKSTEP;
clear_tsk_thread_flag(task, TIF_SINGLESTEP);
set_tsk_thread_flag(task, TIF_BLOCKSTEP);
/* Enable taken branch trap. */
pa_psw(task)->r = 0;
@ -275,7 +276,8 @@ long do_syscall_trace_enter(struct pt_regs *regs)
void do_syscall_trace_exit(struct pt_regs *regs)
{
int stepping = !!(current->ptrace & (PT_SINGLESTEP|PT_BLOCKSTEP));
int stepping = test_thread_flag(TIF_SINGLESTEP) ||
test_thread_flag(TIF_BLOCKSTEP);
if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, stepping);