Merge tag 'xtensa-20220325' of https://github.com/jcmvbkbc/linux-xtensa

Pull Xtensa updates from Max Filippov:

 - remove dependency on the compiler's libgcc

 - allow selection of internal kernel ABI via Kconfig

 - enable compiler plugins support for gcc-12 or newer

 - various minor cleanups and fixes

* tag 'xtensa-20220325' of https://github.com/jcmvbkbc/linux-xtensa:
  xtensa: define update_mmu_tlb function
  xtensa: fix xtensa_wsr always writing 0
  xtensa: enable plugin support
  xtensa: clean up kernel exit assembly code
  xtensa: rearrange NMI exit path
  xtensa: merge stack alignment definitions
  xtensa: fix DTC warning unit_address_format
  xtensa: fix stop_machine_cpuslocked call in patch_text
  xtensa: make secondary reset vector support conditional
  xtensa: add kernel ABI selection to Kconfig
  xtensa: don't link with libgcc
  xtensa: add helpers for division, remainder and shifts
  xtensa: add missing XCHAL_HAVE_WINDOWED check
  xtensa: use XCHAL_NUM_AREGS as pt_regs::areg size
  xtensa: rename PT_SIZE to PT_KERNEL_SIZE
  xtensa: Remove unused early_read_config_byte() et al declarations
  xtensa: use strscpy to copy strings
  net: xtensa: use strscpy to copy strings

6 files changed, 50 insertions, 21 deletions

diff --git a/arch/xtensa/include/asm/asmmacro.h b/arch/xtensa/include/asm/asmmacro.h
index 809c507d1825..e3474ca411ff 100644
--- a/arch/xtensa/include/asm/asmmacro.h
+++ b/arch/xtensa/include/asm/asmmacro.h
@@ -191,7 +191,39 @@
 #endif
 	.endm
 
-#define XTENSA_STACK_ALIGNMENT		16
+	.macro	do_nsau cnt, val, tmp, a
+#if XCHAL_HAVE_NSA
+	nsau	\cnt, \val
+#else
+	mov	\a, \val
+	movi	\cnt, 0
+	extui	\tmp, \a, 16, 16
+	bnez	\tmp, 0f
+	movi	\cnt, 16
+	slli	\a, \a, 16
+0:
+	extui	\tmp, \a, 24, 8
+	bnez	\tmp, 1f
+	addi	\cnt, \cnt, 8
+	slli	\a, \a, 8
+1:
+	movi	\tmp, __nsau_data
+	extui	\a, \a, 24, 8
+	add	\tmp, \tmp, \a
+	l8ui	\tmp, \tmp, 0
+	add	\cnt, \cnt, \tmp
+#endif /* !XCHAL_HAVE_NSA */
+	.endm
+
+	.macro	do_abs dst, src, tmp
+#if XCHAL_HAVE_ABS
+	abs	\dst, \src
+#else
+	neg	\tmp, \src
+	movgez	\tmp, \src, \src
+	mov	\dst, \tmp
+#endif
+	.endm
 
 #if defined(__XTENSA_WINDOWED_ABI__)
 
diff --git a/arch/xtensa/include/asm/core.h b/arch/xtensa/include/asm/core.h
index 9138077e567d..f856d2bcb9f3 100644
--- a/arch/xtensa/include/asm/core.h
+++ b/arch/xtensa/include/asm/core.h
@@ -37,4 +37,11 @@
 #endif
 #endif
 
+/* Xtensa ABI requires stack alignment to be at least 16 */
+#if XCHAL_DATA_WIDTH > 16
+#define XTENSA_STACK_ALIGNMENT	XCHAL_DATA_WIDTH
+#else
+#define XTENSA_STACK_ALIGNMENT	16
+#endif
+
 #endif
diff --git a/arch/xtensa/include/asm/pci-bridge.h b/arch/xtensa/include/asm/pci-bridge.h
index 405526912d9a..e320aa5bbedb 100644
--- a/arch/xtensa/include/asm/pci-bridge.h
+++ b/arch/xtensa/include/asm/pci-bridge.h
@@ -73,13 +73,4 @@ static inline void pcibios_init_resource(struct resource *res,
 	res->child = NULL;
 }
 
-
-/* These are used for config access before all the PCI probing has been done. */
-int early_read_config_byte(struct pci_controller*, int, int, int, u8*);
-int early_read_config_word(struct pci_controller*, int, int, int, u16*);
-int early_read_config_dword(struct pci_controller*, int, int, int, u32*);
-int early_write_config_byte(struct pci_controller*, int, int, int, u8);
-int early_write_config_word(struct pci_controller*, int, int, int, u16);
-int early_write_config_dword(struct pci_controller*, int, int, int, u32);
-
 #endif	/* _XTENSA_PCI_BRIDGE_H */
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index 8da562f5da73..0a91376131c5 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -412,6 +412,10 @@ extern  void update_mmu_cache(struct vm_area_struct * vma,
 
 typedef pte_t *pte_addr_t;
 
+void update_mmu_tlb(struct vm_area_struct *vma,
+		    unsigned long address, pte_t *ptep);
+#define __HAVE_ARCH_UPDATE_MMU_TLB
+
 #endif /* !defined (__ASSEMBLY__) */
 
 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
diff --git a/arch/xtensa/include/asm/processor.h b/arch/xtensa/include/asm/processor.h
index abad7c3df46f..4489a27d527a 100644
--- a/arch/xtensa/include/asm/processor.h
+++ b/arch/xtensa/include/asm/processor.h
@@ -18,11 +18,7 @@
 #include <asm/types.h>
 #include <asm/regs.h>
 
-/* Xtensa ABI requires stack alignment to be at least 16 */
-
-#define STACK_ALIGN (XCHAL_DATA_WIDTH > 16 ? XCHAL_DATA_WIDTH : 16)
-
-#define ARCH_SLAB_MINALIGN STACK_ALIGN
+#define ARCH_SLAB_MINALIGN XTENSA_STACK_ALIGNMENT
 
 /*
  * User space process size: 1 GB.
@@ -239,8 +235,8 @@ extern unsigned long __get_wchan(struct task_struct *p);
 
 #define xtensa_set_sr(x, sr) \
 	({ \
-	 unsigned int v = (unsigned int)(x); \
-	 __asm__ __volatile__ ("wsr %0, "__stringify(sr) :: "a"(v)); \
+	 __asm__ __volatile__ ("wsr %0, "__stringify(sr) :: \
+			       "a"((unsigned int)(x))); \
 	 })
 
 #define xtensa_get_sr(sr) \
diff --git a/arch/xtensa/include/asm/ptrace.h b/arch/xtensa/include/asm/ptrace.h
index b109416dc07e..308f209a4740 100644
--- a/arch/xtensa/include/asm/ptrace.h
+++ b/arch/xtensa/include/asm/ptrace.h
@@ -44,6 +44,7 @@
 #ifndef __ASSEMBLY__
 
 #include <asm/coprocessor.h>
+#include <asm/core.h>
 
 /*
  * This struct defines the way the registers are stored on the
@@ -77,14 +78,12 @@ struct pt_regs {
 	/* current register frame.
 	 * Note: The ESF for kernel exceptions ends after 16 registers!
 	 */
-	unsigned long areg[16];
+	unsigned long areg[XCHAL_NUM_AREGS];
 };
 
-#include <asm/core.h>
-
 # define arch_has_single_step()	(1)
 # define task_pt_regs(tsk) ((struct pt_regs*) \
-	(task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
+	(task_stack_page(tsk) + KERNEL_STACK_SIZE) - 1)
 # define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
 # define instruction_pointer(regs) ((regs)->pc)
 # define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \