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tile: support TIF_SYSCALL_TRACEPOINT; select HAVE_SYSCALL_TRACEPOINTS

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This patch adds support for the TIF_SYSCALL_TRACEPOINT on the tile
architecture. Basically, it calls the appropriate tracepoints on syscall
entry and exit.

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Simon Marchi 2013-01-21 19:54:57 -05:00 committed by Chris Metcalf
parent 6e4a2f7f94
commit ef567f25d5
4 changed files with 33 additions and 7 deletions
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1
arch/tile/Kconfig
View File

@ -23,6 +23,7 @@ config TILE
select GENERIC_CLOCKEVENTS
select MODULES_USE_ELF_RELA
select HAVE_ARCH_TRACEHOOK
select HAVE_SYSCALL_TRACEPOINTS
# FIXME: investigate whether we need/want these options.
# select HAVE_IOREMAP_PROT

8
arch/tile/include/asm/thread_info.h
View File

@ -124,6 +124,7 @@ extern void _cpu_idle(void);
#define TIF_SECCOMP 6 /* secure computing */
#define TIF_MEMDIE 7 /* OOM killer at work */
#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
#define TIF_SYSCALL_TRACEPOINT 9 /* syscall tracepoint instrumentation */
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
@ -134,12 +135,19 @@ extern void _cpu_idle(void);
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
#define _TIF_MEMDIE (1<<TIF_MEMDIE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
/* Work to do on any return to user space. */
#define _TIF_ALLWORK_MASK \
(_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SINGLESTEP|\
_TIF_ASYNC_TLB|_TIF_NOTIFY_RESUME)
/* Work to do at syscall entry. */
#define _TIF_SYSCALL_ENTRY_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT)
/* Work to do at syscall exit. */
#define _TIF_SYSCALL_EXIT_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT)
/*
* Thread-synchronous status.
*

14
arch/tile/kernel/intvec_64.S
View File

@ -1000,8 +1000,11 @@ handle_syscall:
/* Trace syscalls, if requested. */
addi r31, r31, THREAD_INFO_FLAGS_OFFSET
ld r30, r31
andi r30, r30, _TIF_SYSCALL_TRACE
{
ld r30, r31
moveli r32, _TIF_SYSCALL_ENTRY_WORK
}
and r30, r30, r32
{
addi r30, r31, THREAD_INFO_STATUS_OFFSET - THREAD_INFO_FLAGS_OFFSET
beqzt r30, .Lrestore_syscall_regs
@ -1074,8 +1077,11 @@ handle_syscall:
FEEDBACK_REENTER(handle_syscall)
/* Do syscall trace again, if requested. */
ld r30, r31
andi r0, r30, _TIF_SYSCALL_TRACE
{
ld r30, r31
moveli r32, _TIF_SYSCALL_EXIT_WORK
}
and r0, r30, r32
{
andi r0, r30, _TIF_SINGLESTEP
beqzt r0, 1f

17
arch/tile/kernel/ptrace.c
View File

@ -25,6 +25,9 @@
#include <asm/traps.h>
#include <arch/chip.h>
#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>
void user_enable_single_step(struct task_struct *child)
{
set_tsk_thread_flag(child, TIF_SINGLESTEP);
@ -249,16 +252,24 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
int do_syscall_trace_enter(struct pt_regs *regs)
{
if (tracehook_report_syscall_entry(regs)) {
regs->regs[TREG_SYSCALL_NR] = -1;
if (test_thread_flag(TIF_SYSCALL_TRACE)) {
if (tracehook_report_syscall_entry(regs))
regs->regs[TREG_SYSCALL_NR] = -1;
}
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_enter(regs, regs->regs[TREG_SYSCALL_NR]);
return regs->regs[TREG_SYSCALL_NR];
}
void do_syscall_trace_exit(struct pt_regs *regs)
{
tracehook_report_syscall_exit(regs, 0);
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, 0);
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_exit(regs, regs->regs[TREG_SYSCALL_NR]);
}
void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)