Merge tag 'xtensa-20200206' of git://github.com/jcmvbkbc/linux-xtensa

Pull xtensa updates from Max Filippov:

 - reorganize exception vectors placement

 - small cleanups (drop unused functions/headers/defconfig entries,
   spelling fixes)

* tag 'xtensa-20200206' of git://github.com/jcmvbkbc/linux-xtensa:
  xtensa: ISS: improve simcall assembly
  xtensa: reorganize vectors placement
  xtensa: separate SMP and XIP support
  xtensa: move fast exception handlers close to vectors
  arch/xtensa: fix Kconfig typos for HAVE_SMP
  xtensa: clean up optional XCHAL_* definitions
  xtensa: drop unused function fast_coprocessor_double
  xtensa: drop empty platform_* functions from platforms
  xtensa: clean up platform headers
  xtensa: drop set_except_vector declaration
  xtensa: configs: Cleanup old Kconfig IO scheduler options

6 files changed, 85 insertions, 63 deletions

diff --git a/arch/xtensa/kernel/coprocessor.S b/arch/xtensa/kernel/coprocessor.S
index bb8e499b9900..c426b846beef 100644
--- a/arch/xtensa/kernel/coprocessor.S
+++ b/arch/xtensa/kernel/coprocessor.S
@@ -58,6 +58,8 @@
 	.endif;								\
 	.long THREAD_XTREGS_CP##x
 
+	__XTENSA_HANDLER
+
 	SAVE_CP_REGS(0)
 	SAVE_CP_REGS(1)
 	SAVE_CP_REGS(2)
@@ -76,7 +78,6 @@
 	LOAD_CP_REGS(6)
 	LOAD_CP_REGS(7)
 
-	.section ".rodata", "a"
 	.align 4
 .Lsave_cp_regs_jump_table:
 	SAVE_CP_REGS_TAB(0)
@@ -98,8 +99,6 @@
 	LOAD_CP_REGS_TAB(6)
 	LOAD_CP_REGS_TAB(7)
 
-	.previous
-
 /*
  * coprocessor_flush(struct thread_info*, index)
  *                             a2        a3
@@ -145,13 +144,6 @@ ENDPROC(coprocessor_flush)
  *	     <  VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
  */
 
-ENTRY(fast_coprocessor_double)
-
-	wsr	a0, excsave1
-	call0	unrecoverable_exception
-
-ENDPROC(fast_coprocessor_double)
-
 ENTRY(fast_coprocessor)
 
 	/* Save remaining registers a1-a3 and SAR */
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index 2c9e48566e48..06fbb0a171f1 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -939,6 +939,9 @@ ENDPROC(unrecoverable_exception)
 
 /* -------------------------- FAST EXCEPTION HANDLERS ----------------------- */
 
+	__XTENSA_HANDLER
+	.literal_position
+
 /*
  * Fast-handler for alloca exceptions
  *
@@ -1024,7 +1027,7 @@ ENDPROC(fast_alloca)
 ENTRY(fast_illegal_instruction_user)
 
 	rsr	a0, ps
-	bbsi.l	a0, PS_WOE_BIT, user_exception
+	bbsi.l	a0, PS_WOE_BIT, 1f
 	s32i	a3, a2, PT_AREG3
 	movi	a3, PS_WOE_MASK
 	or	a0, a0, a3
@@ -1033,6 +1036,8 @@ ENTRY(fast_illegal_instruction_user)
 	l32i	a0, a2, PT_AREG0
 	rsr	a2, depc
 	rfe
+1:
+	call0	user_exception
 
 ENDPROC(fast_illegal_instruction_user)
 #endif
@@ -1071,7 +1076,7 @@ ENTRY(fast_syscall_user)
 	_beqz	a0, fast_syscall_spill_registers
 	_beqi	a0, __NR_xtensa, fast_syscall_xtensa
 
-	j	user_exception
+	call0	user_exception
 
 ENDPROC(fast_syscall_user)
 
@@ -1762,8 +1767,8 @@ ENTRY(fast_second_level_miss)
 
 	rsr	a2, ps
 	bbsi.l	a2, PS_UM_BIT, 1f
-	j	_kernel_exception
-1:	j	_user_exception
+	call0	_kernel_exception
+1:	call0	_user_exception
 
 ENDPROC(fast_second_level_miss)
 
@@ -1859,13 +1864,14 @@ ENTRY(fast_store_prohibited)
 
 	rsr	a2, ps
 	bbsi.l	a2, PS_UM_BIT, 1f
-	j	_kernel_exception
-1:	j	_user_exception
+	call0	_kernel_exception
+1:	call0	_user_exception
 
 ENDPROC(fast_store_prohibited)
 
 #endif /* CONFIG_MMU */
 
+	.text
 /*
  * System Calls.
  *
diff --git a/arch/xtensa/kernel/platform.c b/arch/xtensa/kernel/platform.c
index a95ba05b0abe..ac1e0e566995 100644
--- a/arch/xtensa/kernel/platform.c
+++ b/arch/xtensa/kernel/platform.c
@@ -12,12 +12,10 @@
  * Chris Zankel <chris@zankel.net>
  */
 
+#include <linux/printk.h>
 #include <linux/types.h>
-#include <linux/pci.h>
-#include <linux/time.h>
 #include <asm/platform.h>
 #include <asm/timex.h>
-#include <asm/param.h>		/* HZ */
 
 #define _F(r,f,a,b)							\
 	r __platform_##f a b;                                   	\
@@ -28,6 +26,7 @@
  * (Please, refer to include/asm-xtensa/platform.h for more information)
  */
 
+_F(void, init, (bp_tag_t *first), { });
 _F(void, setup, (char** cmd), { });
 _F(void, restart, (void), { while(1); });
 _F(void, halt, (void), { while(1); });
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index adead45debe8..3880c765d448 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -284,6 +284,8 @@ extern char _UserExceptionVector_text_start;
 extern char _UserExceptionVector_text_end;
 extern char _DoubleExceptionVector_text_start;
 extern char _DoubleExceptionVector_text_end;
+extern char _exception_text_start;
+extern char _exception_text_end;
 #if XCHAL_EXCM_LEVEL >= 2
 extern char _Level2InterruptVector_text_start;
 extern char _Level2InterruptVector_text_end;
@@ -347,7 +349,7 @@ void __init setup_arch(char **cmdline_p)
 	mem_reserve(__pa(_xip_start), __pa(_xip_end));
 #endif
 
-#ifdef CONFIG_VECTORS_OFFSET
+#ifdef CONFIG_VECTORS_ADDR
 	mem_reserve(__pa(&_WindowVectors_text_start),
 		    __pa(&_WindowVectors_text_end));
 
@@ -363,6 +365,8 @@ void __init setup_arch(char **cmdline_p)
 	mem_reserve(__pa(&_DoubleExceptionVector_text_start),
 		    __pa(&_DoubleExceptionVector_text_end));
 
+	mem_reserve(__pa(&_exception_text_start),
+		    __pa(&_exception_text_end));
 #if XCHAL_EXCM_LEVEL >= 2
 	mem_reserve(__pa(&_Level2InterruptVector_text_start),
 		    __pa(&_Level2InterruptVector_text_end));
@@ -384,7 +388,7 @@ void __init setup_arch(char **cmdline_p)
 		    __pa(&_Level6InterruptVector_text_end));
 #endif
 
-#endif /* CONFIG_VECTORS_OFFSET */
+#endif /* CONFIG_VECTORS_ADDR */
 
 #ifdef CONFIG_SMP
 	mem_reserve(__pa(&_SecondaryResetVector_text_start),
diff --git a/arch/xtensa/kernel/vectors.S b/arch/xtensa/kernel/vectors.S
index 841503d3307c..95ad1e773991 100644
--- a/arch/xtensa/kernel/vectors.S
+++ b/arch/xtensa/kernel/vectors.S
@@ -43,6 +43,7 @@
  */
 
 #include <linux/linkage.h>
+#include <asm/asmmacro.h>
 #include <asm/ptrace.h>
 #include <asm/current.h>
 #include <asm/asm-offsets.h>
@@ -477,7 +478,6 @@ _DoubleExceptionVector_handle_exception:
 
 ENDPROC(_DoubleExceptionVector)
 
-	.text
 /*
  * Fixup handler for TLB miss in double exception handler for window owerflow.
  * We get here with windowbase set to the window that was being spilled and
@@ -505,6 +505,7 @@ ENDPROC(_DoubleExceptionVector)
  * a3: exctable, original value in excsave1
  */
 
+	__XTENSA_HANDLER
 	.literal_position
 
 ENTRY(window_overflow_restore_a0_fixup)
diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index 409c05cac15e..d23a6e38f062 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -47,15 +47,20 @@ jiffies = jiffies_64;
 	LONG(sym ## _end);			\
 	LONG(LOADADDR(section))
 
+#if !defined(CONFIG_VECTORS_ADDR) && XCHAL_HAVE_VECBASE
+#define MERGED_VECTORS 1
+#else
+#define MERGED_VECTORS 0
+#endif
+
 /*
- * Macro to define a section for a vector. When CONFIG_VECTORS_OFFSET is
- * defined code for every vector is located with other init data. At startup
+ * Macro to define a section for a vector. When MERGED_VECTORS is 0
+ * code for every vector is located with other init data. At startup
  * time head.S copies code for every vector to its final position according
  * to description recorded in the corresponding RELOCATE_ENTRY.
  */
 
-#ifdef CONFIG_VECTORS_OFFSET
-#define SECTION_VECTOR(sym, section, addr, prevsec)                         \
+#define SECTION_VECTOR4(sym, section, addr, prevsec)			    \
   section addr : AT(((LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3)      \
   {									    \
     . = ALIGN(4);							    \
@@ -63,11 +68,10 @@ jiffies = jiffies_64;
     *(section)								    \
     sym ## _end = ABSOLUTE(.);						    \
   }
-#else
-#define SECTION_VECTOR(section, addr)					    \
+
+#define SECTION_VECTOR2(section, addr)					    \
   . = addr;								    \
   *(section)
-#endif
 
 /*
  *  Mapping of input sections to output sections when linking.
@@ -86,30 +90,32 @@ SECTIONS
     /* The HEAD_TEXT section must be the first section! */
     HEAD_TEXT
 
-#ifndef CONFIG_VECTORS_OFFSET
-  . = ALIGN(PAGE_SIZE);
-  _vecbase = .;
+#if MERGED_VECTORS
+    . = ALIGN(PAGE_SIZE);
+    _vecbase = .;
 
-  SECTION_VECTOR (.WindowVectors.text, WINDOW_VECTORS_VADDR)
+    SECTION_VECTOR2 (.WindowVectors.text, WINDOW_VECTORS_VADDR)
 #if XCHAL_EXCM_LEVEL >= 2
-  SECTION_VECTOR (.Level2InterruptVector.text, INTLEVEL2_VECTOR_VADDR)
+    SECTION_VECTOR2 (.Level2InterruptVector.text, INTLEVEL2_VECTOR_VADDR)
 #endif
 #if XCHAL_EXCM_LEVEL >= 3
-  SECTION_VECTOR (.Level3InterruptVector.text, INTLEVEL3_VECTOR_VADDR)
+    SECTION_VECTOR2 (.Level3InterruptVector.text, INTLEVEL3_VECTOR_VADDR)
 #endif
 #if XCHAL_EXCM_LEVEL >= 4
-  SECTION_VECTOR (.Level4InterruptVector.text, INTLEVEL4_VECTOR_VADDR)
+    SECTION_VECTOR2 (.Level4InterruptVector.text, INTLEVEL4_VECTOR_VADDR)
 #endif
 #if XCHAL_EXCM_LEVEL >= 5
-  SECTION_VECTOR (.Level5InterruptVector.text, INTLEVEL5_VECTOR_VADDR)
+    SECTION_VECTOR2 (.Level5InterruptVector.text, INTLEVEL5_VECTOR_VADDR)
 #endif
 #if XCHAL_EXCM_LEVEL >= 6
-  SECTION_VECTOR (.Level6InterruptVector.text, INTLEVEL6_VECTOR_VADDR)
+    SECTION_VECTOR2 (.Level6InterruptVector.text, INTLEVEL6_VECTOR_VADDR)
 #endif
-  SECTION_VECTOR (.DebugInterruptVector.text, DEBUG_VECTOR_VADDR)
-  SECTION_VECTOR (.KernelExceptionVector.text, KERNEL_VECTOR_VADDR)
-  SECTION_VECTOR (.UserExceptionVector.text, USER_VECTOR_VADDR)
-  SECTION_VECTOR (.DoubleExceptionVector.text, DOUBLEEXC_VECTOR_VADDR)
+    SECTION_VECTOR2 (.DebugInterruptVector.text, DEBUG_VECTOR_VADDR)
+    SECTION_VECTOR2 (.KernelExceptionVector.text, KERNEL_VECTOR_VADDR)
+    SECTION_VECTOR2 (.UserExceptionVector.text, USER_VECTOR_VADDR)
+    SECTION_VECTOR2 (.DoubleExceptionVector.text, DOUBLEEXC_VECTOR_VADDR)
+
+    *(.exception.text)
 #endif
 
     IRQENTRY_TEXT
@@ -159,7 +165,7 @@ SECTIONS
     . = ALIGN(16);
     __boot_reloc_table_start = ABSOLUTE(.);
 
-#ifdef CONFIG_VECTORS_OFFSET
+#if !MERGED_VECTORS
     RELOCATE_ENTRY(_WindowVectors_text,
 		   .WindowVectors.text);
 #if XCHAL_EXCM_LEVEL >= 2
@@ -190,16 +196,17 @@ SECTIONS
 		   .DoubleExceptionVector.text);
     RELOCATE_ENTRY(_DebugInterruptVector_text,
 		   .DebugInterruptVector.text);
+    RELOCATE_ENTRY(_exception_text,
+		   .exception.text);
 #endif
 #ifdef CONFIG_XIP_KERNEL
     RELOCATE_ENTRY(_xip_data, .data);
     RELOCATE_ENTRY(_xip_init_data, .init.data);
-#else
+#endif
 #if defined(CONFIG_SMP)
     RELOCATE_ENTRY(_SecondaryResetVector_text,
 		   .SecondaryResetVector.text);
 #endif
-#endif
 
     __boot_reloc_table_end = ABSOLUTE(.) ;
 
@@ -216,21 +223,24 @@ SECTIONS
   . = ALIGN(4);
   .dummy : { LONG(0) }
 
-#ifdef CONFIG_VECTORS_OFFSET
+#undef LAST
+#define LAST	.dummy
+
+#if !MERGED_VECTORS
   /* The vectors are relocated to the real position at startup time */
 
-  SECTION_VECTOR (_WindowVectors_text,
+  SECTION_VECTOR4 (_WindowVectors_text,
 		  .WindowVectors.text,
 		  WINDOW_VECTORS_VADDR,
 		  .dummy)
-  SECTION_VECTOR (_DebugInterruptVector_text,
+  SECTION_VECTOR4 (_DebugInterruptVector_text,
 		  .DebugInterruptVector.text,
 		  DEBUG_VECTOR_VADDR,
 		  .WindowVectors.text)
 #undef LAST
 #define LAST	.DebugInterruptVector.text
 #if XCHAL_EXCM_LEVEL >= 2
-  SECTION_VECTOR (_Level2InterruptVector_text,
+  SECTION_VECTOR4 (_Level2InterruptVector_text,
 		  .Level2InterruptVector.text,
 		  INTLEVEL2_VECTOR_VADDR,
 		  LAST)
@@ -238,7 +248,7 @@ SECTIONS
 # define LAST	.Level2InterruptVector.text
 #endif
 #if XCHAL_EXCM_LEVEL >= 3
-  SECTION_VECTOR (_Level3InterruptVector_text,
+  SECTION_VECTOR4 (_Level3InterruptVector_text,
 		  .Level3InterruptVector.text,
 		  INTLEVEL3_VECTOR_VADDR,
 		  LAST)
@@ -246,7 +256,7 @@ SECTIONS
 # define LAST	.Level3InterruptVector.text
 #endif
 #if XCHAL_EXCM_LEVEL >= 4
-  SECTION_VECTOR (_Level4InterruptVector_text,
+  SECTION_VECTOR4 (_Level4InterruptVector_text,
 		  .Level4InterruptVector.text,
 		  INTLEVEL4_VECTOR_VADDR,
 		  LAST)
@@ -254,7 +264,7 @@ SECTIONS
 # define LAST	.Level4InterruptVector.text
 #endif
 #if XCHAL_EXCM_LEVEL >= 5
-  SECTION_VECTOR (_Level5InterruptVector_text,
+  SECTION_VECTOR4 (_Level5InterruptVector_text,
 		  .Level5InterruptVector.text,
 		  INTLEVEL5_VECTOR_VADDR,
 		  LAST)
@@ -262,41 +272,51 @@ SECTIONS
 # define LAST	.Level5InterruptVector.text
 #endif
 #if XCHAL_EXCM_LEVEL >= 6
-  SECTION_VECTOR (_Level6InterruptVector_text,
+  SECTION_VECTOR4 (_Level6InterruptVector_text,
 		  .Level6InterruptVector.text,
 		  INTLEVEL6_VECTOR_VADDR,
 		  LAST)
 # undef LAST
 # define LAST	.Level6InterruptVector.text
 #endif
-  SECTION_VECTOR (_KernelExceptionVector_text,
+  SECTION_VECTOR4 (_KernelExceptionVector_text,
 		  .KernelExceptionVector.text,
 		  KERNEL_VECTOR_VADDR,
 		  LAST)
 #undef LAST
-  SECTION_VECTOR (_UserExceptionVector_text,
+  SECTION_VECTOR4 (_UserExceptionVector_text,
 		  .UserExceptionVector.text,
 		  USER_VECTOR_VADDR,
 		  .KernelExceptionVector.text)
-  SECTION_VECTOR (_DoubleExceptionVector_text,
+  SECTION_VECTOR4 (_DoubleExceptionVector_text,
 		  .DoubleExceptionVector.text,
 		  DOUBLEEXC_VECTOR_VADDR,
 		  .UserExceptionVector.text)
-
-  . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
+#define LAST .DoubleExceptionVector.text
 
 #endif
-#if !defined(CONFIG_XIP_KERNEL) && defined(CONFIG_SMP)
+#if defined(CONFIG_SMP)
 
-  SECTION_VECTOR (_SecondaryResetVector_text,
+  SECTION_VECTOR4 (_SecondaryResetVector_text,
 		  .SecondaryResetVector.text,
 		  RESET_VECTOR1_VADDR,
-		  .DoubleExceptionVector.text)
+		  LAST)
+#undef LAST
+#define LAST .SecondaryResetVector.text
 
-  . = LOADADDR(.SecondaryResetVector.text)+SIZEOF(.SecondaryResetVector.text);
+#endif
+#if !MERGED_VECTORS
+  SECTION_VECTOR4 (_exception_text,
+		  .exception.text,
+		  ,
+		  LAST)
+#undef LAST
+#define LAST .exception.text
 
 #endif
+  . = (LOADADDR(LAST) + SIZEOF(LAST) + 3) & ~ 3;
 
+  .dummy1 : AT(ADDR(.dummy1)) { LONG(0) }
   . = ALIGN(PAGE_SIZE);
 
 #ifndef CONFIG_XIP_KERNEL
@@ -314,7 +334,7 @@ SECTIONS
 
 #undef LOAD_OFFSET
 #define LOAD_OFFSET \
-  (CONFIG_XIP_DATA_ADDR - (LOADADDR(.dummy) + SIZEOF(.dummy) + 3) & ~ 3)
+  (CONFIG_XIP_DATA_ADDR - (LOADADDR(.dummy1) + SIZEOF(.dummy1) + 3) & ~ 3)
 
   _xip_data_start = .;
   _sdata = .;