Pull tile arch changes from Chris Metcalf:
"These are some minor new feature work and other changes that didn't
merit getting pushed up after the 3.9 merge window closed.
There should be a lot more activity in the 3.11 merge window"
* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
arch/tile: Fix syscall return value passed to tracepoint
tile: comment assumption about __insn_mtspr for <asm/irqflags.h>
tile: ns2cycles should use __raw_get_cpu_var
arch: remove KCORE_ELF again [tile]
tile: remove two outdated Kconfig entries
tile: support atomic64_dec_if_positive()
tile: support TIF_SYSCALL_TRACEPOINT; select HAVE_SYSCALL_TRACEPOINTS
tile: Add definition of NR_syscalls
tile: move declaration of sys_call_table to <asm/syscall.h>
arch/tile: Enable HAVE_ARCH_TRACEHOOK
arch/tile: Call tracehook_report_syscall_{entry,exit} in syscall trace
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_CLOCKEVENTS
select MODULES_USE_ELF_RELA
+ select HAVE_ARCH_TRACEHOOK
+ select HAVE_SYSCALL_TRACEPOINTS
+ select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
# FIXME: investigate whether we need/want these options.
# select HAVE_IOREMAP_PROT
config GENERIC_CSUM
def_bool y
-config SEMAPHORE_SLEEPERS
- def_bool y
-
config HAVE_ARCH_ALLOC_REMAP
def_bool y
config RWSEM_GENERIC_SPINLOCK
def_bool y
-# We have a very flat architecture from a migration point of view,
-# so save boot time by presetting this (particularly useful on tile-sim).
-config DEFAULT_MIGRATION_COST
- int
- default "10000000"
-
# We only support gcc 4.4 and above, so this should work.
config ARCH_SUPPORTS_OPTIMIZED_INLINING
def_bool y
menu "Executable file formats"
-# only elf supported
-config KCORE_ELF
- def_bool y
- depends on PROC_FS
-
source "fs/Kconfig.binfmt"
endmenu
#include <asm/atomic_64.h>
#endif
+#ifndef __ASSEMBLY__
+
+static inline long long atomic64_dec_if_positive(atomic64_t *v)
+{
+ long long c, old, dec;
+
+ c = atomic64_read(v);
+ for (;;) {
+ dec = c - 1;
+ if (unlikely(dec < 0))
+ break;
+ old = atomic64_cmpxchg((v), c, dec);
+ if (likely(old == c))
+ break;
+ c = old;
+ }
+ return dec;
+}
+
+#endif /* __ASSEMBLY__ */
+
#endif /* _ASM_TILE_ATOMIC_H */
struct pt_regs *get_pt_regs(struct pt_regs *);
/* Trace the current syscall. */
-extern void do_syscall_trace(void);
+extern int do_syscall_trace_enter(struct pt_regs *regs);
+extern void do_syscall_trace_exit(struct pt_regs *regs);
#define arch_has_single_step() (1)
#include <linux/err.h>
#include <arch/abi.h>
+/* The array of function pointers for syscalls. */
+extern void *sys_call_table[];
+#ifdef CONFIG_COMPAT
+extern void *compat_sys_call_table[];
+#endif
+
/*
* Only the low 32 bits of orig_r0 are meaningful, so we return int.
* This importantly ignores the high bits on 64-bit, so comparisons
#include <linux/types.h>
#include <linux/compat.h>
-/* The array of function pointers for syscalls. */
-extern void *sys_call_table[];
-#ifdef CONFIG_COMPAT
-extern void *compat_sys_call_table[];
-#endif
-
/*
* Note that by convention, any syscall which requires the current
* register set takes an additional "struct pt_regs *" pointer; a
#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)
#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.
*
/* Use the standard ABI for syscalls. */
#include <asm-generic/unistd.h>
+#define NR_syscalls __NR_syscalls
+
/* Additional Tilera-specific syscalls. */
#define __NR_cacheflush (__NR_arch_specific_syscall + 1)
__SYSCALL(__NR_cacheflush, sys_cacheflush)
lw r30, r31
andi r30, r30, _TIF_SYSCALL_TRACE
bzt r30, .Lrestore_syscall_regs
- jal do_syscall_trace
+ {
+ PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+ jal do_syscall_trace_enter
+ }
FEEDBACK_REENTER(handle_syscall)
/*
lw r30, r31
andi r30, r30, _TIF_SYSCALL_TRACE
bzt r30, 1f
- jal do_syscall_trace
+ {
+ PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+ jal do_syscall_trace_exit
+ }
FEEDBACK_REENTER(handle_syscall)
1: {
movei r30, 0 /* not an NMI */
/* 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
}
- jal do_syscall_trace
+ {
+ PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+ jal do_syscall_trace_enter
+ }
FEEDBACK_REENTER(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
}
- jal do_syscall_trace
+ {
+ PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+ jal do_syscall_trace_exit
+ }
FEEDBACK_REENTER(handle_syscall)
andi r0, r30, _TIF_SINGLESTEP
#include <linux/uaccess.h>
#include <linux/regset.h>
#include <linux/elf.h>
+#include <linux/tracehook.h>
#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);
}
#endif
-void do_syscall_trace(void)
+int do_syscall_trace_enter(struct pt_regs *regs)
{
- if (!test_thread_flag(TIF_SYSCALL_TRACE))
- return;
+ if (test_thread_flag(TIF_SYSCALL_TRACE)) {
+ if (tracehook_report_syscall_entry(regs))
+ regs->regs[TREG_SYSCALL_NR] = -1;
+ }
- if (!(current->ptrace & PT_PTRACED))
- return;
+ if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+ trace_sys_enter(regs, regs->regs[TREG_SYSCALL_NR]);
- /*
- * The 0x80 provides a way for the tracing parent to distinguish
- * between a syscall stop and SIGTRAP delivery
- */
- ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
+ return regs->regs[TREG_SYSCALL_NR];
+}
- /*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
- */
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
+void do_syscall_trace_exit(struct pt_regs *regs)
+{
+ 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[0]);
}
void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
*/
cycles_t ns2cycles(unsigned long nsecs)
{
- struct clock_event_device *dev = &__get_cpu_var(tile_timer);
+ /*
+ * We do not have to disable preemption here as each core has the same
+ * clock frequency.
+ */
+ struct clock_event_device *dev = &__raw_get_cpu_var(tile_timer);
return ((u64)nsecs * dev->mult) >> dev->shift;
}
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff