Merge tag 'xtensa-20181228' of git://github.com/jcmvbkbc/linux-xtensa

Pull Xtensa updates from Max Filippov:

 - switch to generated syscall table

 - switch ptrace to regsets, use regsets for core dumps

 - complete tracehook implementation

 - add syscall tracepoints support

 - add jumplabels support

 - add memtest support

 - drop unused/duplicated code from entry.S, ptrace.c, coprocessor.S,
   elf.h and syscall.h

 - clean up warnings caused by WSR/RSR macros

 - clean up DTC warnings about SPI controller node names in xtfpga.dtsi

 - simplify coprocessor.S

 - get rid of explicit 'l32r' instruction usage in assembly

* tag 'xtensa-20181228' of git://github.com/jcmvbkbc/linux-xtensa: (25 commits)
  xtensa: implement jump_label support
  xtensa: implement syscall tracepoints
  xtensa: implement tracehook functions and enable HAVE_ARCH_TRACEHOOK
  xtensa: enable CORE_DUMP_USE_REGSET
  xtensa: implement TIE regset
  xtensa: implement task_user_regset_view
  xtensa: call do_syscall_trace_{enter,leave} selectively
  xtensa: use NO_SYSCALL instead of -1
  xtensa: define syscall_get_arch()
  Move EM_XTENSA to uapi/linux/elf-em.h
  xtensa: support memtest
  xtensa: don't use l32r opcode directly
  xtensa: xtfpga.dtsi: fix dtc warnings about SPI
  xtensa: don't clear cpenable unconditionally on release
  xtensa: simplify coprocessor.S
  xtensa: clean up WSR*/RSR*/get_sr/set_sr
  xtensa: drop unused declarations from elf.h
  xtensa: clean up syscall.h
  xtensa: drop unused coprocessor helper functions
  xtensa: drop custom PTRACE_{PEEK,POKE}{TEXT,DATA}
  ...

1 files changed, 19 insertions, 26 deletions

diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index 9cbc380e9572..e50f5124dc6f 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -364,7 +364,7 @@ common_exception:
 	s32i	a2, a1, PT_DEBUGCAUSE
 	s32i	a3, a1, PT_PC
 
-	movi	a2, -1
+	movi	a2, NO_SYSCALL
 	rsr	a3, excvaddr
 	s32i	a2, a1, PT_SYSCALL
 	movi	a2, 0
@@ -1022,25 +1022,6 @@ ENDPROC(fast_alloca)
  *   excsave_1:	dispatch table
  */
 
-ENTRY(fast_syscall_kernel)
-
-	/* Skip syscall. */
-
-	rsr	a0, epc1
-	addi	a0, a0, 3
-	wsr	a0, epc1
-
-	l32i	a0, a2, PT_DEPC
-	bgeui	a0, VALID_DOUBLE_EXCEPTION_ADDRESS, fast_syscall_unrecoverable
-
-	rsr	a0, depc			# get syscall-nr
-	_beqz	a0, fast_syscall_spill_registers
-	_beqi	a0, __NR_xtensa, fast_syscall_xtensa
-
-	j	kernel_exception
-
-ENDPROC(fast_syscall_kernel)
-
 ENTRY(fast_syscall_user)
 
 	/* Skip syscall. */
@@ -1865,20 +1846,28 @@ ENTRY(system_call)
 
 	/* regs->syscall = regs->areg[2] */
 
-	l32i	a3, a2, PT_AREG2
+	l32i	a7, a2, PT_AREG2
+	s32i	a7, a2, PT_SYSCALL
+
+	GET_THREAD_INFO(a4, a1)
+	l32i	a3, a4, TI_FLAGS
+	movi	a4, _TIF_WORK_MASK
+	and	a3, a3, a4
+	beqz	a3, 1f
+
 	mov	a6, a2
-	s32i	a3, a2, PT_SYSCALL
 	call4	do_syscall_trace_enter
-	mov	a3, a6
+	l32i	a7, a2, PT_SYSCALL
 
+1:
 	/* syscall = sys_call_table[syscall_nr] */
 
 	movi	a4, sys_call_table
-	movi	a5, __NR_syscall_count
+	movi	a5, __NR_syscalls
 	movi	a6, -ENOSYS
-	bgeu	a3, a5, 1f
+	bgeu	a7, a5, 1f
 
-	addx4	a4, a3, a4
+	addx4	a4, a7, a4
 	l32i	a4, a4, 0
 	movi	a5, sys_ni_syscall;
 	beq	a4, a5, 1f
@@ -1900,6 +1889,10 @@ ENTRY(system_call)
 1:	/* regs->areg[2] = return_value */
 
 	s32i	a6, a2, PT_AREG2
+	bnez	a3, 1f
+	retw
+
+1:
 	mov	a6, a2
 	call4	do_syscall_trace_leave
 	retw