diff options
Diffstat (limited to 'arch/csky')
42 files changed, 902 insertions, 511 deletions
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig index 725a115759c9..cf798a1628cf 100644 --- a/arch/csky/Kconfig +++ b/arch/csky/Kconfig @@ -1,6 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0-only config CSKY def_bool y select ARCH_32BIT_OFF_T + select ARCH_HAS_DMA_PREP_COHERENT select ARCH_HAS_SYNC_DMA_FOR_CPU select ARCH_HAS_SYNC_DMA_FOR_DEVICE select ARCH_USE_BUILTIN_BSWAP @@ -29,15 +31,20 @@ config CSKY select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD select HAVE_ARCH_TRACEHOOK + select HAVE_ARCH_AUDITSYSCALL + select HAVE_DYNAMIC_FTRACE select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_GRAPH_TRACER + select HAVE_FTRACE_MCOUNT_RECORD select HAVE_KERNEL_GZIP select HAVE_KERNEL_LZO select HAVE_KERNEL_LZMA select HAVE_PERF_EVENTS - select HAVE_C_RECORDMCOUNT + select HAVE_PERF_REGS + select HAVE_PERF_USER_STACK_DUMP select HAVE_DMA_API_DEBUG select HAVE_DMA_CONTIGUOUS + select HAVE_SYSCALL_TRACEPOINTS select MAY_HAVE_SPARSE_IRQ select MODULES_USE_ELF_RELA if MODULES select OF @@ -92,9 +99,6 @@ config GENERIC_HWEIGHT config MMU def_bool y -config RWSEM_GENERIC_SPINLOCK - def_bool y - config STACKTRACE_SUPPORT def_bool y diff --git a/arch/csky/Kconfig.debug b/arch/csky/Kconfig.debug index 22a162cd99e8..295942fe3fd5 100644 --- a/arch/csky/Kconfig.debug +++ b/arch/csky/Kconfig.debug @@ -1 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only # dummy file, do not delete diff --git a/arch/csky/Makefile b/arch/csky/Makefile index 3607a6e8f66c..f9aab9157c4a 100644 --- a/arch/csky/Makefile +++ b/arch/csky/Makefile @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only OBJCOPYFLAGS :=-O binary GZFLAGS :=-9 KBUILD_DEFCONFIG := defconfig @@ -36,7 +37,7 @@ endif ifneq ($(CSKYABI),) MCPU_STR = $(CPUTYPE)$(FPUEXT)$(VDSPEXT)$(TEEEXT) -KBUILD_CFLAGS += -mcpu=$(MCPU_STR) +KBUILD_CFLAGS += -mcpu=$(CPUTYPE) -Wa,-mcpu=$(MCPU_STR) KBUILD_CFLAGS += -DCSKYCPU_DEF_NAME=\"$(MCPU_STR)\" KBUILD_CFLAGS += -msoft-float -mdiv KBUILD_CFLAGS += -fno-tree-vectorize diff --git a/arch/csky/abiv1/Makefile b/arch/csky/abiv1/Makefile index 7c062768d44d..e52b42beac97 100644 --- a/arch/csky/abiv1/Makefile +++ b/arch/csky/abiv1/Makefile @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_CPU_NEED_SOFTALIGN) += alignment.o obj-y += bswapdi.o obj-y += bswapsi.o diff --git a/arch/csky/abiv1/inc/abi/ckmmu.h b/arch/csky/abiv1/inc/abi/ckmmu.h index 3a002017bebe..81f37715c0d2 100644 --- a/arch/csky/abiv1/inc/abi/ckmmu.h +++ b/arch/csky/abiv1/inc/abi/ckmmu.h @@ -40,6 +40,26 @@ static inline void write_mmu_entryhi(int value) cpwcr("cpcr4", value); } +static inline unsigned long read_mmu_msa0(void) +{ + return cprcr("cpcr30"); +} + +static inline void write_mmu_msa0(unsigned long value) +{ + cpwcr("cpcr30", value); +} + +static inline unsigned long read_mmu_msa1(void) +{ + return cprcr("cpcr31"); +} + +static inline void write_mmu_msa1(unsigned long value) +{ + cpwcr("cpcr31", value); +} + /* * TLB operations. */ @@ -65,11 +85,11 @@ static inline void tlb_invalid_indexed(void) static inline void setup_pgd(unsigned long pgd, bool kernel) { - cpwcr("cpcr29", pgd); + cpwcr("cpcr29", pgd | BIT(0)); } static inline unsigned long get_pgd(void) { - return cprcr("cpcr29"); + return cprcr("cpcr29") & ~BIT(0); } #endif /* __ASM_CSKY_CKMMUV1_H */ diff --git a/arch/csky/abiv1/inc/abi/entry.h b/arch/csky/abiv1/inc/abi/entry.h index 3f3faab3d747..7ab78bd0f3b1 100644 --- a/arch/csky/abiv1/inc/abi/entry.h +++ b/arch/csky/abiv1/inc/abi/entry.h @@ -16,9 +16,6 @@ #define LSAVE_A4 40 #define LSAVE_A5 44 -#define EPC_INCREASE 2 -#define EPC_KEEP 0 - .macro USPTOKSP mtcr sp, ss1 mfcr sp, ss0 @@ -29,10 +26,6 @@ mfcr sp, ss1 .endm -.macro INCTRAP rx - addi \rx, EPC_INCREASE -.endm - .macro SAVE_ALL epc_inc mtcr r13, ss2 mfcr r13, epsr @@ -150,11 +143,35 @@ cpwcr \rx, cpcr8 .endm -.macro SETUP_MMU rx - lrw \rx, PHYS_OFFSET | 0xe - cpwcr \rx, cpcr30 - lrw \rx, (PHYS_OFFSET + 0x20000000) | 0xe - cpwcr \rx, cpcr31 +.macro SETUP_MMU + /* Init psr and enable ee */ + lrw r6, DEFAULT_PSR_VALUE + mtcr r6, psr + psrset ee + + /* Select MMU as co-processor */ + cpseti cp15 + + /* + * cpcr30 format: + * 31 - 29 | 28 - 4 | 3 | 2 | 1 | 0 + * BA Reserved C D V + */ + cprcr r6, cpcr30 + lsri r6, 28 + lsli r6, 28 + addi r6, 0xe + cpwcr r6, cpcr30 + + lsri r6, 28 + addi r6, 2 + lsli r6, 28 + addi r6, 0xe + cpwcr r6, cpcr31 .endm +.macro ANDI_R3 rx, imm + lsri \rx, 3 + andi \rx, (\imm >> 3) +.endm #endif /* __ASM_CSKY_ENTRY_H */ diff --git a/arch/csky/abiv1/inc/abi/regdef.h b/arch/csky/abiv1/inc/abi/regdef.h index 876689291b71..104707fbdcc1 100644 --- a/arch/csky/abiv1/inc/abi/regdef.h +++ b/arch/csky/abiv1/inc/abi/regdef.h @@ -5,9 +5,8 @@ #define __ASM_CSKY_REGDEF_H #define syscallid r1 -#define r11_sig r11 - #define regs_syscallid(regs) regs->regs[9] +#define regs_fp(regs) regs->regs[2] /* * PSR format: @@ -23,4 +22,6 @@ #define SYSTRACE_SAVENUM 2 +#define TRAP0_SIZE 2 + #endif /* __ASM_CSKY_REGDEF_H */ diff --git a/arch/csky/abiv2/Makefile b/arch/csky/abiv2/Makefile index b1d44f6fbcbd..c561efa5533c 100644 --- a/arch/csky/abiv2/Makefile +++ b/arch/csky/abiv2/Makefile @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only obj-y += cacheflush.o obj-$(CONFIG_CPU_HAS_FPU) += fpu.o obj-y += memcmp.o diff --git a/arch/csky/abiv2/cacheflush.c b/arch/csky/abiv2/cacheflush.c index d22c95ffc74d..5bb887b275e1 100644 --- a/arch/csky/abiv2/cacheflush.c +++ b/arch/csky/abiv2/cacheflush.c @@ -34,10 +34,6 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, { unsigned long addr, pfn; struct page *page; - void *va; - - if (!(vma->vm_flags & VM_EXEC)) - return; pfn = pte_pfn(*pte); if (unlikely(!pfn_valid(pfn))) @@ -47,14 +43,9 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, if (page == ZERO_PAGE(0)) return; - va = page_address(page); - addr = (unsigned long) va; - - if (va == NULL && PageHighMem(page)) - addr = (unsigned long) kmap_atomic(page); + addr = (unsigned long) kmap_atomic(page); cache_wbinv_range(addr, addr + PAGE_SIZE); - if (va == NULL && PageHighMem(page)) - kunmap_atomic((void *) addr); + kunmap_atomic((void *) addr); } diff --git a/arch/csky/abiv2/inc/abi/ckmmu.h b/arch/csky/abiv2/inc/abi/ckmmu.h index 97230ad9427c..e4480e6bc3b3 100644 --- a/arch/csky/abiv2/inc/abi/ckmmu.h +++ b/arch/csky/abiv2/inc/abi/ckmmu.h @@ -42,6 +42,26 @@ static inline void write_mmu_entryhi(int value) mtcr("cr<4, 15>", value); } +static inline unsigned long read_mmu_msa0(void) +{ + return mfcr("cr<30, 15>"); +} + +static inline void write_mmu_msa0(unsigned long value) +{ + mtcr("cr<30, 15>", value); +} + +static inline unsigned long read_mmu_msa1(void) +{ + return mfcr("cr<31, 15>"); +} + +static inline void write_mmu_msa1(unsigned long value) +{ + mtcr("cr<31, 15>", value); +} + /* * TLB operations. */ @@ -70,18 +90,16 @@ static inline void tlb_invalid_indexed(void) mtcr("cr<8, 15>", 0x02000000); } -/* setup hardrefil pgd */ -static inline unsigned long get_pgd(void) -{ - return mfcr("cr<29, 15>"); -} - static inline void setup_pgd(unsigned long pgd, bool kernel) { if (kernel) - mtcr("cr<28, 15>", pgd); + mtcr("cr<28, 15>", pgd | BIT(0)); else - mtcr("cr<29, 15>", pgd); + mtcr("cr<29, 15>", pgd | BIT(0)); } +static inline unsigned long get_pgd(void) +{ + return mfcr("cr<29, 15>") & ~BIT(0); +} #endif /* __ASM_CSKY_CKMMUV2_H */ diff --git a/arch/csky/abiv2/inc/abi/entry.h b/arch/csky/abiv2/inc/abi/entry.h index edc5cc04c4de..9897a16b45e5 100644 --- a/arch/csky/abiv2/inc/abi/entry.h +++ b/arch/csky/abiv2/inc/abi/entry.h @@ -14,18 +14,11 @@ #define LSAVE_A2 32 #define LSAVE_A3 36 -#define EPC_INCREASE 4 -#define EPC_KEEP 0 - #define KSPTOUSP #define USPTOKSP #define usp cr<14, 1> -.macro INCTRAP rx - addi \rx, EPC_INCREASE -.endm - .macro SAVE_ALL epc_inc subi sp, 152 stw tls, (sp, 0) @@ -169,10 +162,80 @@ mtcr \rx, cr<8, 15> .endm -.macro SETUP_MMU rx - lrw \rx, PHYS_OFFSET | 0xe - mtcr \rx, cr<30, 15> - lrw \rx, (PHYS_OFFSET + 0x20000000) | 0xe - mtcr \rx, cr<31, 15> +.macro SETUP_MMU + /* Init psr and enable ee */ + lrw r6, DEFAULT_PSR_VALUE + mtcr r6, psr + psrset ee + + /* Invalid I/Dcache BTB BHT */ + movi r6, 7 + lsli r6, 16 + addi r6, (1<<4) | 3 + mtcr r6, cr17 + + /* Invalid all TLB */ + bgeni r6, 26 + mtcr r6, cr<8, 15> /* Set MCIR */ + + /* Check MMU on/off */ + mfcr r6, cr18 + btsti r6, 0 + bt 1f + + /* MMU off: setup mapping tlb entry */ + movi r6, 0 + mtcr r6, cr<6, 15> /* Set MPR with 4K page size */ + + grs r6, 1f /* Get current pa by PC */ + bmaski r7, (PAGE_SHIFT + 1) /* r7 = 0x1fff */ + andn r6, r7 + mtcr r6, cr<4, 15> /* Set MEH */ + + mov r8, r6 + movi r7, 0x00000006 + or r8, r7 + mtcr r8, cr<2, 15> /* Set MEL0 */ + movi r7, 0x00001006 + or r8, r7 + mtcr r8, cr<3, 15> /* Set MEL1 */ + + bgeni r8, 28 + mtcr r8, cr<8, 15> /* Set MCIR to write TLB */ + + br 2f +1: + /* + * MMU on: use origin MSA value from bootloader + * + * cr<30/31, 15> MSA register format: + * 31 - 29 | 28 - 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 + * BA Reserved SH WA B SO SEC C D V + */ + mfcr r6, cr<30, 15> /* Get MSA0 */ +2: + lsri r6, 28 + lsli r6, 28 + addi r6, 0x1ce + mtcr r6, cr<30, 15> /* Set MSA0 */ + + lsri r6, 28 + addi r6, 2 + lsli r6, 28 + addi r6, 0x1ce + mtcr r6, cr<31, 15> /* Set MSA1 */ + + /* enable MMU */ + mfcr r6, cr18 + bseti r6, 0 + mtcr r6, cr18 + + jmpi 3f /* jump to va */ +3: +.endm + +.macro ANDI_R3 rx, imm + lsri \rx, 3 + andi \rx, (\imm >> 3) .endm #endif /* __ASM_CSKY_ENTRY_H */ diff --git a/arch/csky/abiv2/inc/abi/regdef.h b/arch/csky/abiv2/inc/abi/regdef.h index c72abb781bdc..d7328bbc1ce7 100644 --- a/arch/csky/abiv2/inc/abi/regdef.h +++ b/arch/csky/abiv2/inc/abi/regdef.h @@ -5,9 +5,8 @@ #define __ASM_CSKY_REGDEF_H #define syscallid r7 -#define r11_sig r11 - #define regs_syscallid(regs) regs->regs[3] +#define regs_fp(regs) regs->regs[4] /* * PSR format: @@ -23,4 +22,6 @@ #define SYSTRACE_SAVENUM 5 +#define TRAP0_SIZE 4 + #endif /* __ASM_CSKY_REGDEF_H */ diff --git a/arch/csky/abiv2/mcount.S b/arch/csky/abiv2/mcount.S index c633379956f5..326402e65f9e 100644 --- a/arch/csky/abiv2/mcount.S +++ b/arch/csky/abiv2/mcount.S @@ -61,10 +61,17 @@ addi sp, 16 .endm +.macro nop32_stub + nop32 + nop32 + nop32 +.endm + ENTRY(ftrace_stub) jmp lr END(ftrace_stub) +#ifndef CONFIG_DYNAMIC_FTRACE ENTRY(_mcount) mcount_enter @@ -76,7 +83,7 @@ ENTRY(_mcount) bf skip_ftrace mov a0, lr - subi a0, MCOUNT_INSN_SIZE + subi a0, 4 ldw a1, (sp, 24) jsr r26 @@ -101,13 +108,41 @@ skip_ftrace: mcount_exit #endif END(_mcount) +#else /* CONFIG_DYNAMIC_FTRACE */ +ENTRY(_mcount) + mov t1, lr + ldw lr, (sp, 0) + addi sp, 4 + jmp t1 +ENDPROC(_mcount) + +ENTRY(ftrace_caller) + mcount_enter + + ldw a0, (sp, 16) + subi a0, 4 + ldw a1, (sp, 24) + + nop +GLOBAL(ftrace_call) + nop32_stub + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + nop +GLOBAL(ftrace_graph_call) + nop32_stub +#endif + + mcount_exit +ENDPROC(ftrace_caller) +#endif /* CONFIG_DYNAMIC_FTRACE */ #ifdef CONFIG_FUNCTION_GRAPH_TRACER ENTRY(ftrace_graph_caller) mov a0, sp addi a0, 24 ldw a1, (sp, 16) - subi a1, MCOUNT_INSN_SIZE + subi a1, 4 mov a2, r8 lrw r26, prepare_ftrace_return jsr r26 diff --git a/arch/csky/abiv2/memmove.S b/arch/csky/abiv2/memmove.S index b0c42ecf1889..5721e73ad3d8 100644 --- a/arch/csky/abiv2/memmove.S +++ b/arch/csky/abiv2/memmove.S @@ -35,11 +35,7 @@ ENTRY(memmove) .L_len_larger_16bytes: subi r1, 16 subi r0, 16 -#if defined(__CSKY_VDSPV2__) - vldx.8 vr0, (r1), r19 - PRE_BNEZAD (r18) - vstx.8 vr0, (r0), r19 -#elif defined(__CK860__) +#if defined(__CK860__) ldw r3, (r1, 12) stw r3, (r0, 12) ldw r3, (r1, 8) diff --git a/arch/csky/boot/Makefile b/arch/csky/boot/Makefile index 47d3d723784c..dbc9b1bd72f0 100644 --- a/arch/csky/boot/Makefile +++ b/arch/csky/boot/Makefile @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only targets := Image zImage uImage targets += $(dtb-y) diff --git a/arch/csky/boot/dts/Makefile b/arch/csky/boot/dts/Makefile index c57ad3c880bf..5f1f55e911ad 100644 --- a/arch/csky/boot/dts/Makefile +++ b/arch/csky/boot/dts/Makefile @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only dtstree := $(srctree)/$(src) dtb-y := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts)) diff --git a/arch/csky/boot/dts/include/dt-bindings b/arch/csky/boot/dts/include/dt-bindings deleted file mode 120000 index 08c00e4972fa..000000000000 --- a/arch/csky/boot/dts/include/dt-bindings +++ /dev/null @@ -1 +0,0 @@ -../../../../../include/dt-bindings
\ No newline at end of file diff --git a/arch/csky/include/asm/Kbuild b/arch/csky/include/asm/Kbuild index 2a0abe8f2a35..4d4754e6bf89 100644 --- a/arch/csky/include/asm/Kbuild +++ b/arch/csky/include/asm/Kbuild @@ -1,6 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 generic-y += asm-offsets.h generic-y += bugs.h -generic-y += clkdev.h generic-y += compat.h generic-y += current.h generic-y += delay.h @@ -12,7 +12,6 @@ generic-y += dma-mapping.h generic-y += emergency-restart.h generic-y += exec.h generic-y += fb.h -generic-y += ftrace.h generic-y += futex.h generic-y += gpio.h generic-y += hardirq.h @@ -28,16 +27,14 @@ generic-y += linkage.h generic-y += local.h generic-y += local64.h generic-y += mm-arch-hooks.h +generic-y += mmiowb.h generic-y += module.h -generic-y += mutex.h generic-y += pci.h generic-y += percpu.h generic-y += preempt.h generic-y += qrwlock.h -generic-y += scatterlist.h generic-y += sections.h generic-y += serial.h -generic-y += shm.h generic-y += timex.h generic-y += topology.h generic-y += trace_clock.h diff --git a/arch/csky/include/asm/ftrace.h b/arch/csky/include/asm/ftrace.h index 7547c45312a8..ba35d93ecda2 100644 --- a/arch/csky/include/asm/ftrace.h +++ b/arch/csky/include/asm/ftrace.h @@ -4,10 +4,26 @@ #ifndef __ASM_CSKY_FTRACE_H #define __ASM_CSKY_FTRACE_H -#define MCOUNT_INSN_SIZE 4 +#define MCOUNT_INSN_SIZE 14 #define HAVE_FUNCTION_GRAPH_FP_TEST #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR +#define MCOUNT_ADDR ((unsigned long)_mcount) + +#ifndef __ASSEMBLY__ + +extern void _mcount(unsigned long); + +extern void ftrace_graph_call(void); + +static inline unsigned long ftrace_call_adjust(unsigned long addr) +{ + return addr; +} + +struct dyn_arch_ftrace { +}; +#endif /* !__ASSEMBLY__ */ #endif /* __ASM_CSKY_FTRACE_H */ diff --git a/arch/csky/include/asm/mmu_context.h b/arch/csky/include/asm/mmu_context.h index b2905c0485a7..734db3a122e1 100644 --- a/arch/csky/include/asm/mmu_context.h +++ b/arch/csky/include/asm/mmu_context.h @@ -14,23 +14,10 @@ #include <linux/sched.h> #include <abi/ckmmu.h> -static inline void tlbmiss_handler_setup_pgd(unsigned long pgd, bool kernel) -{ - pgd -= PAGE_OFFSET; - pgd += PHYS_OFFSET; - pgd |= 1; - setup_pgd(pgd, kernel); -} - #define TLBMISS_HANDLER_SETUP_PGD(pgd) \ - tlbmiss_handler_setup_pgd((unsigned long)pgd, 0) + setup_pgd(__pa(pgd), false) #define TLBMISS_HANDLER_SETUP_PGD_KERNEL(pgd) \ - tlbmiss_handler_setup_pgd((unsigned long)pgd, 1) - -static inline unsigned long tlb_get_pgd(void) -{ - return ((get_pgd() - PHYS_OFFSET) & ~1) + PAGE_OFFSET; -} + setup_pgd(__pa(pgd), true) #define cpu_context(cpu, mm) ((mm)->context.asid[cpu]) #define cpu_asid(cpu, mm) (cpu_context((cpu), (mm)) & ASID_MASK) diff --git a/arch/csky/include/asm/page.h b/arch/csky/include/asm/page.h index 73cf2bd66a13..9738eacefdc7 100644 --- a/arch/csky/include/asm/page.h +++ b/arch/csky/include/asm/page.h @@ -8,7 +8,7 @@ #include <linux/const.h> /* - * PAGE_SHIFT determines the page size + * PAGE_SHIFT determines the page size: 4KB */ #define PAGE_SHIFT 12 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) @@ -17,12 +17,18 @@ #define THREAD_MASK (~(THREAD_SIZE - 1)) #define THREAD_SHIFT (PAGE_SHIFT + 1) + /* - * NOTE: virtual isn't really correct, actually it should be the offset into the - * memory node, but we have no highmem, so that works for now. - * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots - * of the shifts unnecessary. + * For C-SKY "User-space:Kernel-space" is "2GB:2GB" fixed by hardware and there + * are two segment registers (MSA0 + MSA1) to mapping 512MB + 512MB physical + * address region. We use them mapping kernel 1GB direct-map address area and + * for more than 1GB of memory we use highmem. */ +#define PAGE_OFFSET 0x80000000 +#define SSEG_SIZE 0x20000000 +#define LOWMEM_LIMIT (SSEG_SIZE * 2) + +#define PHYS_OFFSET_OFFSET (CONFIG_RAM_BASE & (SSEG_SIZE - 1)) #ifndef __ASSEMBLY__ @@ -50,9 +56,6 @@ struct page; struct vm_area_struct; -/* - * These are used to make use of C type-checking.. - */ typedef struct { unsigned long pte_low; } pte_t; #define pte_val(x) ((x).pte_low) @@ -69,18 +72,13 @@ typedef struct page *pgtable_t; #define __pgd(x) ((pgd_t) { (x) }) #define __pgprot(x) ((pgprot_t) { (x) }) -#endif /* !__ASSEMBLY__ */ +extern unsigned long va_pa_offset; -#define PHYS_OFFSET (CONFIG_RAM_BASE & ~(LOWMEM_LIMIT - 1)) -#define PHYS_OFFSET_OFFSET (CONFIG_RAM_BASE & (LOWMEM_LIMIT - 1)) -#define ARCH_PFN_OFFSET PFN_DOWN(CONFIG_RAM_BASE) +#define ARCH_PFN_OFFSET PFN_DOWN(va_pa_offset + PHYS_OFFSET_OFFSET) -#define PAGE_OFFSET 0x80000000 -#define LOWMEM_LIMIT 0x40000000 +#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + va_pa_offset) +#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - va_pa_offset)) -#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) -#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - \ - PHYS_OFFSET)) #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) #define MAP_NR(x) PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \ @@ -90,15 +88,10 @@ typedef struct page *pgtable_t; #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) -/* - * main RAM and kernel working space are coincident at 0x80000000, but to make - * life more interesting, there's also an uncached virtual shadow at 0xb0000000 - * - these mappings are fixed in the MMU - */ - #define pfn_to_kaddr(x) __va(PFN_PHYS(x)) #include <asm-generic/memory_model.h> #include <asm-generic/getorder.h> +#endif /* !__ASSEMBLY__ */ #endif /* __ASM_CSKY_PAGE_H */ diff --git a/arch/csky/include/asm/perf_event.h b/arch/csky/include/asm/perf_event.h index ea8193122294..572093e11001 100644 --- a/arch/csky/include/asm/perf_event.h +++ b/arch/csky/include/asm/perf_event.h @@ -4,4 +4,12 @@ #ifndef __ASM_CSKY_PERF_EVENT_H #define __ASM_CSKY_PERF_EVENT_H +#include <abi/regdef.h> + +#define perf_arch_fetch_caller_regs(regs, __ip) { \ + (regs)->pc = (__ip); \ + regs_fp(regs) = (unsigned long) __builtin_frame_address(0); \ + asm volatile("mov %0, sp\n":"=r"((regs)->usp)); \ +} + #endif /* __ASM_PERF_EVENT_ELF_H */ diff --git a/arch/csky/include/asm/ptrace.h b/arch/csky/include/asm/ptrace.h new file mode 100644 index 000000000000..d0aba7b32417 --- /dev/null +++ b/arch/csky/include/asm/ptrace.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_PTRACE_H +#define __ASM_CSKY_PTRACE_H + +#include <uapi/asm/ptrace.h> +#include <asm/traps.h> +#include <linux/types.h> + +#ifndef __ASSEMBLY__ + +#define PS_S 0x80000000 /* Supervisor Mode */ + +#define arch_has_single_step() (1) +#define current_pt_regs() \ +({ (struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1; }) + +#define user_stack_pointer(regs) ((regs)->usp) + +#define user_mode(regs) (!((regs)->sr & PS_S)) +#define instruction_pointer(regs) ((regs)->pc) +#define profile_pc(regs) instruction_pointer(regs) + +static inline bool in_syscall(struct pt_regs const *regs) +{ + return ((regs->sr >> 16) & 0xff) == VEC_TRAP0; +} + +static inline void forget_syscall(struct pt_regs *regs) +{ + regs->sr &= ~(0xff << 16); +} + +static inline unsigned long regs_return_value(struct pt_regs *regs) +{ + return regs->a0; +} + +#endif /* __ASSEMBLY__ */ +#endif /* __ASM_CSKY_PTRACE_H */ diff --git a/arch/csky/include/asm/syscall.h b/arch/csky/include/asm/syscall.h index bda0a446c63e..f624fa3bbc22 100644 --- a/arch/csky/include/asm/syscall.h +++ b/arch/csky/include/asm/syscall.h @@ -8,6 +8,8 @@ #include <abi/regdef.h> #include <uapi/linux/audit.h> +extern void *sys_call_table[]; + static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) { @@ -15,6 +17,13 @@ syscall_get_nr(struct task_struct *task, struct pt_regs *regs) } static inline void +syscall_set_nr(struct task_struct *task, struct pt_regs *regs, + int sysno) +{ + regs_syscallid(regs) = sysno; +} + +static inline void syscall_rollback(struct task_struct *task, struct pt_regs *regs) { regs->a0 = regs->orig_a0; @@ -60,7 +69,7 @@ syscall_set_arguments(struct task_struct *task, struct pt_regs *regs, } static inline int -syscall_get_arch(void) +syscall_get_arch(struct task_struct *task) { return AUDIT_ARCH_CSKY; } diff --git a/arch/csky/include/asm/thread_info.h b/arch/csky/include/asm/thread_info.h index 0e9d035d712b..0b546a55a8bf 100644 --- a/arch/csky/include/asm/thread_info.h +++ b/arch/csky/include/asm/thread_info.h @@ -51,29 +51,26 @@ static inline struct thread_info *current_thread_info(void) #endif /* !__ASSEMBLY__ */ -/* entry.S relies on these definitions! - * bits 0-5 are tested at every exception exit - */ #define TIF_SIGPENDING 0 /* signal pending */ #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ -#define TIF_SYSCALL_TRACE 5 /* syscall trace active */ -#define TIF_DELAYED_TRACE 14 /* single step a syscall */ +#define TIF_SYSCALL_TRACE 3 /* syscall trace active */ +#define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */ +#define TIF_SYSCALL_AUDIT 5 /* syscall auditing */ #define TIF_POLLING_NRFLAG 16 /* poll_idle() is TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ -#define TIF_FREEZE 19 /* thread is freezing for suspend */ #define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */ #define TIF_SECCOMP 21 /* secure computing */ -#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) -#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) -#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) -#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) -#define _TIF_DELAYED_TRACE (1 << TIF_DELAYED_TRACE) -#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) +#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) +#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) +#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) +#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) +#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) +#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) +#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_MEMDIE (1 << TIF_MEMDIE) -#define _TIF_FREEZE (1 << TIF_FREEZE) -#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) -#define _TIF_SECCOMP (1 << TIF_SECCOMP) +#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) +#define _TIF_SECCOMP (1 << TIF_SECCOMP) #endif /* _ASM_CSKY_THREAD_INFO_H */ diff --git a/arch/csky/include/asm/unistd.h b/arch/csky/include/asm/unistd.h index 284487477a61..da7a18295615 100644 --- a/arch/csky/include/asm/unistd.h +++ b/arch/csky/include/asm/unistd.h @@ -2,3 +2,5 @@ // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <uapi/asm/unistd.h> + +#define NR_syscalls (__NR_syscalls) diff --git a/arch/csky/include/uapi/asm/Kbuild b/arch/csky/include/uapi/asm/Kbuild index 1c72f04ff75d..e78470141932 100644 --- a/arch/csky/include/uapi/asm/Kbuild +++ b/arch/csky/include/uapi/asm/Kbuild @@ -1 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 generic-y += ucontext.h diff --git a/arch/csky/include/uapi/asm/perf_regs.h b/arch/csky/include/uapi/asm/perf_regs.h new file mode 100644 index 000000000000..ee323d818592 --- /dev/null +++ b/arch/csky/include/uapi/asm/perf_regs.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef _ASM_CSKY_PERF_REGS_H +#define _ASM_CSKY_PERF_REGS_H + +/* Index of struct pt_regs */ +enum perf_event_csky_regs { + PERF_REG_CSKY_TLS, + PERF_REG_CSKY_LR, + PERF_REG_CSKY_PC, + PERF_REG_CSKY_SR, + PERF_REG_CSKY_SP, + PERF_REG_CSKY_ORIG_A0, + PERF_REG_CSKY_A0, + PERF_REG_CSKY_A1, + PERF_REG_CSKY_A2, + PERF_REG_CSKY_A3, + PERF_REG_CSKY_REGS0, + PERF_REG_CSKY_REGS1, + PERF_REG_CSKY_REGS2, + PERF_REG_CSKY_REGS3, + PERF_REG_CSKY_REGS4, + PERF_REG_CSKY_REGS5, + PERF_REG_CSKY_REGS6, + PERF_REG_CSKY_REGS7, + PERF_REG_CSKY_REGS8, + PERF_REG_CSKY_REGS9, +#if defined(__CSKYABIV2__) + PERF_REG_CSKY_EXREGS0, + PERF_REG_CSKY_EXREGS1, + PERF_REG_CSKY_EXREGS2, + PERF_REG_CSKY_EXREGS3, + PERF_REG_CSKY_EXREGS4, + PERF_REG_CSKY_EXREGS5, + PERF_REG_CSKY_EXREGS6, + PERF_REG_CSKY_EXREGS7, + PERF_REG_CSKY_EXREGS8, + PERF_REG_CSKY_EXREGS9, + PERF_REG_CSKY_EXREGS10, + PERF_REG_CSKY_EXREGS11, + PERF_REG_CSKY_EXREGS12, + PERF_REG_CSKY_EXREGS13, + PERF_REG_CSKY_EXREGS14, + PERF_REG_CSKY_HI, + PERF_REG_CSKY_LO, + PERF_REG_CSKY_DCSR, +#endif + PERF_REG_CSKY_MAX, +}; +#endif /* _ASM_CSKY_PERF_REGS_H */ diff --git a/arch/csky/include/uapi/asm/ptrace.h b/arch/csky/include/uapi/asm/ptrace.h index a4eaa8ddf0b1..4e248d5b86ef 100644 --- a/arch/csky/include/uapi/asm/ptrace.h +++ b/arch/csky/include/uapi/asm/ptrace.h @@ -48,20 +48,5 @@ struct user_fp { unsigned long reserved; }; -#ifdef __KERNEL__ - -#define PS_S 0x80000000 /* Supervisor Mode */ - -#define arch_has_single_step() (1) -#define current_pt_regs() \ -({ (struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1; }) - -#define user_stack_pointer(regs) ((regs)->usp) - -#define user_mode(regs) (!((regs)->sr & PS_S)) -#define instruction_pointer(regs) ((regs)->pc) -#define profile_pc(regs) instruction_pointer(regs) - -#endif /* __KERNEL__ */ #endif /* __ASSEMBLY__ */ #endif /* _CSKY_PTRACE_H */ diff --git a/arch/csky/kernel/Makefile b/arch/csky/kernel/Makefile index 484e6d3a3647..071d659f37b7 100644 --- a/arch/csky/kernel/Makefile +++ b/arch/csky/kernel/Makefile @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only extra-y := head.o vmlinux.lds obj-y += entry.o atomic.o signal.o traps.o irq.o time.o vdso.o @@ -9,6 +10,8 @@ obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_CSKY_PMU_V1) += perf_event.o +obj-$(CONFIG_PERF_EVENTS) += perf_callchain.o +obj-$(CONFIG_HAVE_PERF_REGS) += perf_regs.o ifdef CONFIG_FUNCTION_TRACER CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE) diff --git a/arch/csky/kernel/atomic.S b/arch/csky/kernel/atomic.S index d2357c8f85bd..5b84f11485ae 100644 --- a/arch/csky/kernel/atomic.S +++ b/arch/csky/kernel/atomic.S @@ -12,11 +12,10 @@ * If *ptr != oldval && return 1, * else *ptr = newval return 0. */ -#ifdef CONFIG_CPU_HAS_LDSTEX ENTRY(csky_cmpxchg) USPTOKSP mfcr a3, epc - INCTRAP a3 + addi a3, TRAP0_SIZE subi sp, 8 stw a3, (sp, 0) @@ -24,6 +23,7 @@ ENTRY(csky_cmpxchg) stw a3, (sp, 4) psrset ee +#ifdef CONFIG_CPU_HAS_LDSTEX 1: ldex a3, (a2) cmpne a0, a3 @@ -33,27 +33,7 @@ ENTRY(csky_cmpxchg) bez a3, 1b 2: sync.is - mvc a0 - ldw a3, (sp, 0) - mtcr a3, epc - ldw a3, (sp, 4) - mtcr a3, epsr - addi sp, 8 - KSPTOUSP - rte -END(csky_cmpxchg) #else -ENTRY(csky_cmpxchg) - USPTOKSP - mfcr a3, epc - INCTRAP a3 - - subi sp, 8 - stw a3, (sp, 0) - mfcr a3, epsr - stw a3, (sp, 4) - - psrset ee 1: ldw a3, (a2) cmpne a0, a3 @@ -61,6 +41,7 @@ ENTRY(csky_cmpxchg) 2: stw a1, (a2) 3: +#endif mvc a0 ldw a3, (sp, 0) mtcr a3, epc @@ -71,6 +52,7 @@ ENTRY(csky_cmpxchg) rte END(csky_cmpxchg) +#ifndef CONFIG_CPU_HAS_LDSTEX /* * Called from tlbmodified exception */ diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S index 5137ed9062bd..a7e84ccccbd8 100644 --- a/arch/csky/kernel/entry.S +++ b/arch/csky/kernel/entry.S @@ -40,7 +40,8 @@ ENTRY(csky_\name) WR_MCIR a2 #endif bclri r6, 0 - lrw a2, PHYS_OFFSET + lrw a2, va_pa_offset + ld.w a2, (a2, 0) subu r6, a2 bseti r6, 31 @@ -50,7 +51,8 @@ ENTRY(csky_\name) addu r6, a2 ldw r6, (r6) - lrw a2, PHYS_OFFSET + lrw a2, va_pa_offset + ld.w a2, (a2, 0) subu r6, a2 bseti r6, 31 @@ -91,7 +93,7 @@ ENTRY(csky_\name) mfcr a3, ss2 mfcr r6, ss3 mfcr a2, ss4 - SAVE_ALL EPC_KEEP + SAVE_ALL 0 .endm .macro tlbop_end is_write RD_MEH a2 @@ -99,7 +101,6 @@ ENTRY(csky_\name) mov a0, sp movi a1, \is_write jbsr do_page_fault - movi r11_sig, 0 /* r11 = 0, Not a syscall. */ jmpi ret_from_exception .endm @@ -118,7 +119,7 @@ jbsr csky_cmpxchg_fixup tlbop_end 1 ENTRY(csky_systemcall) - SAVE_ALL EPC_INCREASE + SAVE_ALL TRAP0_SIZE psrset ee, ie @@ -136,8 +137,9 @@ ENTRY(csky_systemcall) bmaski r10, THREAD_SHIFT andn r9, r10 ldw r8, (r9, TINFO_FLAGS) - btsti r8, TIF_SYSCALL_TRACE - bt 1f + ANDI_R3 r8, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT) + cmpnei r8, 0 + bt csky_syscall_trace #if defined(__CSKYABIV2__) subi sp, 8 stw r5, (sp, 0x4) @@ -150,10 +152,9 @@ ENTRY(csky_systemcall) stw a0, (sp, LSAVE_A0) /* Save return value */ jmpi ret_from_exception -1: - movi a0, 0 /* enter system call */ - mov a1, sp /* sp = pt_regs pointer */ - jbsr syscall_trace +csky_syscall_trace: + mov a0, sp /* sp = pt_regs pointer */ + jbsr syscall_trace_enter /* Prepare args before do system call */ ldw a0, (sp, LSAVE_A0) ldw a1, (sp, LSAVE_A1) @@ -173,9 +174,8 @@ ENTRY(csky_systemcall) #endif stw a0, (sp, LSAVE_A0) /* Save return value */ - movi a0, 1 /* leave system call */ - mov a1, sp /* right now, sp --> pt_regs */ - jbsr syscall_trace + mov a0, sp /* right now, sp --> pt_regs */ + jbsr syscall_trace_exit br ret_from_exception ENTRY(ret_from_kernel_thread) @@ -190,14 +190,11 @@ ENTRY(ret_from_fork) bmaski r10, THREAD_SHIFT andn r9, r10 ldw r8, (r9, TINFO_FLAGS) - movi r11_sig, 1 - btsti r8, TIF_SYSCALL_TRACE - bf 3f - movi a0, 1 - mov a1, sp /* sp = pt_regs pointer */ - jbsr syscall_trace -3: - jbsr ret_from_exception + ANDI_R3 r8, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT) + cmpnei r8, 0 + bf ret_from_exception + mov a0, sp /* sp = pt_regs pointer */ + jbsr syscall_trace_exit ret_from_exception: ld syscallid, (sp, LSAVE_PSR) @@ -212,41 +209,30 @@ ret_from_exception: bmaski r10, THREAD_SHIFT andn r9, r10 -resume_userspace: ldw r8, (r9, TINFO_FLAGS) andi r8, (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED) cmpnei r8, 0 bt exit_work -1: RESTORE_ALL +1: + RESTORE_ALL exit_work: + lrw syscallid, ret_from_exception + mov lr, syscallid + btsti r8, TIF_NEED_RESCHED bt work_resched - /* If thread_info->flag is empty, RESTORE_ALL */ - cmpnei r8, 0 - bf 1b - mov a1, sp - mov a0, r8 - mov a2, r11_sig /* syscall? */ - btsti r8, TIF_SIGPENDING /* delivering a signal? */ - /* prevent further restarts(set r11 = 0) */ - clrt r11_sig - jbsr do_notify_resume /* do signals */ - br resume_userspace + + mov a0, sp + mov a1, r8 + jmpi do_notify_resume work_resched: - lrw syscallid, ret_from_exception - mov r15, syscallid /* Return address in link */ jmpi schedule -ENTRY(sys_rt_sigreturn) - movi r11_sig, 0 - jmpi do_rt_sigreturn - ENTRY(csky_trap) - SAVE_ALL EPC_KEEP + SAVE_ALL 0 psrset ee - movi r11_sig, 0 /* r11 = 0, Not a syscall. */ mov a0, sp /* Push Stack pointer arg */ jbsr trap_c /* Call C-level trap handler */ jmpi ret_from_exception @@ -261,7 +247,7 @@ ENTRY(csky_get_tls) /* increase epc for continue */ mfcr a0, epc - INCTRAP a0 + addi a0, TRAP0_SIZE mtcr a0, epc /* get current task thread_info with kernel 8K stack */ @@ -278,9 +264,8 @@ ENTRY(csky_get_tls) rte ENTRY(csky_irq) - SAVE_ALL EPC_KEEP + SAVE_ALL 0 psrset ee - movi r11_sig, 0 /* r11 = 0, Not a syscall. */ #ifdef CONFIG_PREEMPT mov r9, sp /* Get current stack pointer */ diff --git a/arch/csky/kernel/ftrace.c b/arch/csky/kernel/ftrace.c index 274c431f1810..44f4880179b7 100644 --- a/arch/csky/kernel/ftrace.c +++ b/arch/csky/kernel/ftrace.c @@ -3,6 +3,137 @@ #include <linux/ftrace.h> #include <linux/uaccess.h> +#include <asm/cacheflush.h> + +#ifdef CONFIG_DYNAMIC_FTRACE + +#define NOP 0x4000 +#define NOP32_HI 0xc400 +#define NOP32_LO 0x4820 +#define PUSH_LR 0x14d0 +#define MOVIH_LINK 0xea3a +#define ORI_LINK 0xef5a +#define JSR_LINK 0xe8fa +#define BSR_LINK 0xe000 + +/* + * Gcc-csky with -pg will insert stub in function prologue: + * push lr + * jbsr _mcount + * nop32 + * nop32 + * + * If the (callee - current_pc) is less then 64MB, we'll use bsr: + * push lr + * bsr _mcount + * nop32 + * nop32 + * else we'll use (movih + ori + jsr): + * push lr + * movih r26, ... + * ori r26, ... + * jsr r26 + * + * (r26 is our reserved link-reg) + * + */ +static inline void make_jbsr(unsigned long callee, unsigned long pc, + uint16_t *call, bool nolr) +{ + long offset; + + call[0] = nolr ? NOP : PUSH_LR; + + offset = (long) callee - (long) pc; + + if (unlikely(offset < -67108864 || offset > 67108864)) { + call[1] = MOVIH_LINK; + call[2] = callee >> 16; + call[3] = ORI_LINK; + call[4] = callee & 0xffff; + call[5] = JSR_LINK; + call[6] = 0; + } else { + offset = offset >> 1; + + call[1] = BSR_LINK | + ((uint16_t)((unsigned long) offset >> 16) & 0x3ff); + call[2] = (uint16_t)((unsigned long) offset & 0xffff); + call[3] = call[5] = NOP32_HI; + call[4] = call[6] = NOP32_LO; + } +} + +static uint16_t nops[7] = {NOP, NOP32_HI, NOP32_LO, NOP32_HI, NOP32_LO, + NOP32_HI, NOP32_LO}; +static int ftrace_check_current_nop(unsigned long hook) +{ + uint16_t olds[7]; + unsigned long hook_pos = hook - 2; + + if (probe_kernel_read((void *)olds, (void *)hook_pos, sizeof(nops))) + return -EFAULT; + + if (memcmp((void *)nops, (void *)olds, sizeof(nops))) { + pr_err("%p: nop but get (%04x %04x %04x %04x %04x %04x %04x)\n", + (void *)hook_pos, + olds[0], olds[1], olds[2], olds[3], olds[4], olds[5], + olds[6]); + + return -EINVAL; + } + + return 0; +} + +static int ftrace_modify_code(unsigned long hook, unsigned long target, + bool enable, bool nolr) +{ + uint16_t call[7]; + + unsigned long hook_pos = hook - 2; + int ret = 0; + + make_jbsr(target, hook, call, nolr); + + ret = probe_kernel_write((void *)hook_pos, enable ? call : nops, + sizeof(nops)); + if (ret) + return -EPERM; + + flush_icache_range(hook_pos, hook_pos + MCOUNT_INSN_SIZE); + + return 0; +} + +int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) +{ + int ret = ftrace_check_current_nop(rec->ip); + + if (ret) + return ret; + + return ftrace_modify_code(rec->ip, addr, true, false); +} + +int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, + unsigned long addr) +{ + return ftrace_modify_code(rec->ip, addr, false, false); +} + +int ftrace_update_ftrace_func(ftrace_func_t func) +{ + int ret = ftrace_modify_code((unsigned long)&ftrace_call, + (unsigned long)func, true, true); + return ret; +} + +int __init ftrace_dyn_arch_init(void) +{ + return 0; +} +#endif /* CONFIG_DYNAMIC_FTRACE */ #ifdef CONFIG_FUNCTION_GRAPH_TRACER void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, @@ -43,8 +174,21 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, *(unsigned long *)frame_pointer = return_hooker; } } -#endif + +#ifdef CONFIG_DYNAMIC_FTRACE +int ftrace_enable_ftrace_graph_caller(void) +{ + return ftrace_modify_code((unsigned long)&ftrace_graph_call, + (unsigned long)&ftrace_graph_caller, true, true); +} + +int ftrace_disable_ftrace_graph_caller(void) +{ + return ftrace_modify_code((unsigned long)&ftrace_graph_call, + (unsigned long)&ftrace_graph_caller, false, true); +} +#endif /* CONFIG_DYNAMIC_FTRACE */ +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ /* _mcount is defined in abi's mcount.S */ -extern void _mcount(void); EXPORT_SYMBOL(_mcount); diff --git a/arch/csky/kernel/head.S b/arch/csky/kernel/head.S index 9c4ec473b76b..61989f9241c0 100644 --- a/arch/csky/kernel/head.S +++ b/arch/csky/kernel/head.S @@ -7,16 +7,11 @@ __HEAD ENTRY(_start) - /* set super user mode */ - lrw a3, DEFAULT_PSR_VALUE - mtcr a3, psr - psrset ee - - SETUP_MMU a3 + SETUP_MMU /* set stack point */ - lrw a3, init_thread_union + THREAD_SIZE - mov sp, a3 + lrw r6, init_thread_union + THREAD_SIZE + mov sp, r6 jmpi csky_start END(_start) @@ -24,53 +19,12 @@ END(_start) #ifdef CONFIG_SMP .align 10 ENTRY(_start_smp_secondary) - /* Invalid I/Dcache BTB BHT */ - movi a3, 7 - lsli a3, 16 - addi a3, (1<<4) | 3 - mtcr a3, cr17 - - tlbi.alls - - /* setup PAGEMASK */ - movi a3, 0 - mtcr a3, cr<6, 15> - - /* setup MEL0/MEL1 */ - grs a0, _start_smp_pc -_start_smp_pc: - bmaski a1, 13 - andn a0, a1 - movi a1, 0x00000006 - movi a2, 0x00001006 - or a1, a0 - or a2, a0 - mtcr a1, cr<2, 15> - mtcr a2, cr<3, 15> - - /* setup MEH */ - mtcr a0, cr<4, 15> - - /* write TLB */ - bgeni a3, 28 - mtcr a3, cr<8, 15> - - SETUP_MMU a3 - - /* enable MMU */ - movi a3, 1 - mtcr a3, cr18 - - jmpi _goto_mmu_on -_goto_mmu_on: - lrw a3, DEFAULT_PSR_VALUE - mtcr a3, psr - psrset ee + SETUP_MMU /* set stack point */ - lrw a3, secondary_stack - ld.w a3, (a3, 0) - mov sp, a3 + lrw r6, secondary_stack + ld.w r6, (r6, 0) + mov sp, r6 jmpi csky_start_secondary END(_start_smp_secondary) diff --git a/arch/csky/kernel/perf_callchain.c b/arch/csky/kernel/perf_callchain.c new file mode 100644 index 000000000000..e68ff375c8f8 --- /dev/null +++ b/arch/csky/kernel/perf_callchain.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/perf_event.h> +#include <linux/uaccess.h> + +/* Kernel callchain */ +struct stackframe { + unsigned long fp; + unsigned long lr; +}; + +static int unwind_frame_kernel(struct stackframe *frame) +{ + if (kstack_end((void *)frame->fp)) + return -EPERM; + if (frame->fp & 0x3 || frame->fp < TASK_SIZE) + return -EPERM; + + *frame = *(struct stackframe *)frame->fp; + if (__kernel_text_address(frame->lr)) { + int graph = 0; + + frame->lr = ftrace_graph_ret_addr(NULL, &graph, frame->lr, + NULL); + } + return 0; +} + +static void notrace walk_stackframe(struct stackframe *fr, + struct perf_callchain_entry_ctx *entry) +{ + do { + perf_callchain_store(entry, fr->lr); + } while (unwind_frame_kernel(fr) >= 0); +} + +/* + * Get the return address for a single stackframe and return a pointer to the + * next frame tail. + */ +static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry, + unsigned long fp, unsigned long reg_lr) +{ + struct stackframe buftail; + unsigned long lr = 0; + unsigned long *user_frame_tail = (unsigned long *)fp; + + /* Check accessibility of one struct frame_tail beyond */ + if (!access_ok(user_frame_tail, sizeof(buftail))) + return 0; + if (__copy_from_user_inatomic(&buftail, user_frame_tail, + sizeof(buftail))) + return 0; + + if (reg_lr != 0) + lr = reg_lr; + else + lr = buftail.lr; + + fp = buftail.fp; + perf_callchain_store(entry, lr); + + return fp; +} + +/* + * This will be called when the target is in user mode + * This function will only be called when we use + * "PERF_SAMPLE_CALLCHAIN" in + * kernel/events/core.c:perf_prepare_sample() + * + * How to trigger perf_callchain_[user/kernel] : + * $ perf record -e cpu-clock --call-graph fp ./program + * $ perf report --call-graph + * + * On C-SKY platform, the program being sampled and the C library + * need to be compiled with * -mbacktrace, otherwise the user + * stack will not contain function frame. + */ +void perf_callchain_user(struct perf_callchain_entry_ctx *entry, + struct pt_regs *regs) +{ + unsigned long fp = 0; + + /* C-SKY does not support virtualization. */ + if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) + return; + + fp = regs->regs[4]; + perf_callchain_store(entry, regs->pc); + + /* + * While backtrace from leaf function, lr is normally + * not saved inside frame on C-SKY, so get lr from pt_regs + * at the sample point. However, lr value can be incorrect if + * lr is used as temp register + */ + fp = user_backtrace(entry, fp, regs->lr); + + while (fp && !(fp & 0x3) && entry->nr < entry->max_stack) + fp = user_backtrace(entry, fp, 0); +} + +void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, + struct pt_regs *regs) +{ + struct stackframe fr; + + /* C-SKY does not support virtualization. */ + if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + pr_warn("C-SKY does not support perf in guest mode!"); + return; + } + + fr.fp = regs->regs[4]; + fr.lr = regs->lr; + walk_stackframe(&fr, entry); +} diff --git a/arch/csky/kernel/perf_regs.c b/arch/csky/kernel/perf_regs.c new file mode 100644 index 000000000000..eb32838b8210 --- /dev/null +++ b/arch/csky/kernel/perf_regs.c @@ -0,0 +1,40 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/perf_event.h> +#include <linux/bug.h> +#include <asm/perf_regs.h> +#include <asm/ptrace.h> + +u64 perf_reg_value(struct pt_regs *regs, int idx) +{ + if (WARN_ON_ONCE((u32)idx >= PERF_REG_CSKY_MAX)) + return 0; + + return (u64)*((u32 *)regs + idx); +} + +#define REG_RESERVED (~((1ULL << PERF_REG_CSKY_MAX) - 1)) + +int perf_reg_validate(u64 mask) +{ + if (!mask || mask & REG_RESERVED) + return -EINVAL; + + return 0; +} + +u64 perf_reg_abi(struct task_struct *task) +{ + return PERF_SAMPLE_REGS_ABI_32; +} + +void perf_get_regs_user(struct perf_regs *regs_user, + struct pt_regs *regs, + struct pt_regs *regs_user_copy) +{ + regs_user->regs = task_pt_regs(current); + regs_user->abi = perf_reg_abi(current); +} diff --git a/arch/csky/kernel/ptrace.c b/arch/csky/kernel/ptrace.c index f2f12fff36f7..313623a19ecb 100644 --- a/arch/csky/kernel/ptrace.c +++ b/arch/csky/kernel/ptrace.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. +#include <linux/audit.h> #include <linux/elf.h> #include <linux/errno.h> #include <linux/kernel.h> @@ -11,6 +12,7 @@ #include <linux/sched/task_stack.h> #include <linux/signal.h> #include <linux/smp.h> +#include <linux/tracehook.h> #include <linux/uaccess.h> #include <linux/user.h> @@ -22,6 +24,9 @@ #include <abi/regdef.h> +#define CREATE_TRACE_POINTS +#include <trace/events/syscalls.h> + /* sets the trace bits. */ #define TRACE_MODE_SI (1 << 14) #define TRACE_MODE_RUN 0 @@ -207,35 +212,27 @@ long arch_ptrace(struct task_struct *child, long request, return ret; } -/* - * If process's system calls is traces, do some corresponding handles in this - * function before entering system call function and after exiting system call - * function. - */ -asmlinkage void syscall_trace(int why, struct pt_regs *regs) +asmlinkage void syscall_trace_enter(struct pt_regs *regs) { - long saved_why; - /* - * Save saved_why, why is used to denote syscall entry/exit; - * why = 0:entry, why = 1: exit - */ - saved_why = regs->regs[SYSTRACE_SAVENUM]; - regs->regs[SYSTRACE_SAVENUM] = why; - - ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) - ? 0x80 : 0)); - - /* - * 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; - } + if (test_thread_flag(TIF_SYSCALL_TRACE)) + if (tracehook_report_syscall_entry(regs)) + syscall_set_nr(current, regs, -1); + + if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) + trace_sys_enter(regs, syscall_get_nr(current, regs)); + + audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3); +} + +asmlinkage void syscall_trace_exit(struct pt_regs *regs) +{ + audit_syscall_exit(regs); + + if (test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_exit(regs, 0); - regs->regs[SYSTRACE_SAVENUM] = saved_why; + if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) + trace_sys_exit(regs, syscall_get_return_value(current, regs)); } extern void show_stack(struct task_struct *task, unsigned long *stack); diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c index dff8b89444ec..23ee604aafdb 100644 --- a/arch/csky/kernel/setup.c +++ b/arch/csky/kernel/setup.c @@ -142,18 +142,24 @@ void __init setup_arch(char **cmdline_p) #endif } -asmlinkage __visible void __init csky_start(unsigned int unused, void *param) +unsigned long va_pa_offset; +EXPORT_SYMBOL(va_pa_offset); + +asmlinkage __visible void __init csky_start(unsigned int unused, + void *dtb_start) { /* Clean up bss section */ memset(__bss_start, 0, __bss_stop - __bss_start); + va_pa_offset = read_mmu_msa0() & ~(SSEG_SIZE - 1); + pre_trap_init(); pre_mmu_init(); - if (param == NULL) + if (dtb_start == NULL) early_init_dt_scan(__dtb_start); else - early_init_dt_scan(param); + early_init_dt_scan(dtb_start); start_kernel(); diff --git a/arch/csky/kernel/signal.c b/arch/csky/kernel/signal.c index 207a891479d2..04a43cfd4e09 100644 --- a/arch/csky/kernel/signal.c +++ b/arch/csky/kernel/signal.c @@ -1,26 +1,10 @@ // SPDX-License-Identifier: GPL-2.0 -// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/kernel.h> #include <linux/signal.h> +#include <linux/uaccess.h> #include <linux/syscalls.h> -#include <linux/errno.h> -#include <linux/wait.h> -#include <linux/ptrace.h> -#include <linux/unistd.h> -#include <linux/stddef.h> -#include <linux/highuid.h> -#include <linux/personality.h> -#include <linux/tty.h> -#include <linux/binfmts.h> #include <linux/tracehook.h> -#include <linux/freezer.h> -#include <linux/uaccess.h> -#include <asm/setup.h> -#include <asm/pgtable.h> #include <asm/traps.h> #include <asm/ucontext.h> #include <asm/vdso.h> @@ -29,110 +13,117 @@ #ifdef CONFIG_CPU_HAS_FPU #include <abi/fpu.h> - -static int restore_fpu_state(struct sigcontext *sc) +static int restore_fpu_state(struct sigcontext __user *sc) { int err = 0; struct user_fp user_fp; - err = copy_from_user(&user_fp, &sc->sc_user_fp, sizeof(user_fp)); + err = __copy_from_user(&user_fp, &sc->sc_user_fp, sizeof(user_fp)); restore_from_user_fp(&user_fp); return err; } -static int save_fpu_state(struct sigcontext *sc) +static int save_fpu_state(struct sigcontext __user *sc) { struct user_fp user_fp; save_to_user_fp(&user_fp); - return copy_to_user(&sc->sc_user_fp, &user_fp, sizeof(user_fp)); + return __copy_to_user(&sc->sc_user_fp, &user_fp, sizeof(user_fp)); } #else -static inline int restore_fpu_state(struct sigcontext *sc) { return 0; } -static inline int save_fpu_state(struct sigcontext *sc) { return 0; } +#define restore_fpu_state(sigcontext) (0) +#define save_fpu_state(sigcontext) (0) #endif struct rt_sigframe { - int sig; - struct siginfo *pinfo; - void *puc; struct siginfo info; struct ucontext uc; }; -static int -restore_sigframe(struct pt_regs *regs, - struct sigcontext *sc, int *pr2) +static long restore_sigcontext(struct pt_regs *regs, + struct sigcontext __user *sc) { int err = 0; - /* Always make any pending restarted system calls return -EINTR */ - current_thread_info()->task->restart_block.fn = do_no_restart_syscall; - - err |= copy_from_user(regs, &sc->sc_pt_regs, sizeof(struct pt_regs)); + /* sc_pt_regs is structured the same as the start of pt_regs */ + err |= __copy_from_user(regs, &sc->sc_pt_regs, sizeof(struct pt_regs)); + /* Restore the floating-point state. */ err |= restore_fpu_state(sc); - *pr2 = regs->a0; return err; } -asmlinkage int -do_rt_sigreturn(void) +SYSCALL_DEFINE0(rt_sigreturn) { - sigset_t set; - int a0; struct pt_regs *regs = current_pt_regs(); - struct rt_sigframe *frame = (struct rt_sigframe *)(regs->usp); + struct rt_sigframe __user *frame; + struct task_struct *task; + sigset_t set; + + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + frame = (struct rt_sigframe __user *)regs->usp; if (!access_ok(frame, sizeof(*frame))) goto badframe; + if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) goto badframe; - sigdelsetmask(&set, (sigmask(SIGKILL) | sigmask(SIGSTOP))); - spin_lock_irq(¤t->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); + set_current_blocked(&set); - if (restore_sigframe(regs, &frame->uc.uc_mcontext, &a0)) + if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) goto badframe; - return a0; + if (restore_altstack(&frame->uc.uc_stack)) + goto badframe; + + return regs->a0; badframe: - force_sig(SIGSEGV, current); + task = current; + force_sig(SIGSEGV, task); return 0; } -static int setup_sigframe(struct sigcontext *sc, struct pt_regs *regs) +static int setup_sigcontext(struct rt_sigframe __user *frame, + struct pt_regs *regs) { + struct sigcontext __user *sc = &frame->uc.uc_mcontext; int err = 0; - err |= copy_to_user(&sc->sc_pt_regs, regs, sizeof(struct pt_regs)); + err |= __copy_to_user(&sc->sc_pt_regs, regs, sizeof(struct pt_regs)); err |= save_fpu_state(sc); return err; } -static inline void * -get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) +static inline void __user *get_sigframe(struct ksignal *ksig, + struct pt_regs *regs, size_t framesize) { - unsigned long usp; + unsigned long sp; + /* Default to using normal stack */ + sp = regs->usp; + + /* + * If we are on the alternate signal stack and would overflow it, don't. + * Return an always-bogus address instead so we will die with SIGSEGV. + */ + if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) + return (void __user __force *)(-1UL); - /* Default to using normal stack. */ - usp = regs->usp; + /* This is the X/Open sanctioned signal stack switching. */ + sp = sigsp(sp, ksig) - framesize; - /* This is the X/Open sanctioned signal stack switching. */ - if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(usp)) { - if (!on_sig_stack(usp)) - usp = current->sas_ss_sp + current->sas_ss_size; - } - return (void *)((usp - frame_size) & -8UL); + /* Align the stack frame. */ + sp &= -8UL; + + return (void __user *)sp; } static int @@ -140,205 +131,128 @@ setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) { struct rt_sigframe *frame; int err = 0; - struct csky_vdso *vdso = current->mm->context.vdso; - frame = get_sigframe(&ksig->ka, regs, sizeof(*frame)); - if (!frame) - return 1; + frame = get_sigframe(ksig, regs, sizeof(*frame)); + if (!access_ok(frame, sizeof(*frame))) + return -EFAULT; - err |= __put_user(ksig->sig, &frame->sig); - err |= __put_user(&frame->info, &frame->pinfo); - err |= __put_user(&frame->uc, &frame->puc); err |= copy_siginfo_to_user(&frame->info, &ksig->info); - /* Create the ucontext. */ + /* Create the ucontext. */ err |= __put_user(0, &frame->uc.uc_flags); - err |= __put_user(0, &frame->uc.uc_link); - err |= __put_user((void *)current->sas_ss_sp, - &frame->uc.uc_stack.ss_sp); - err |= __put_user(sas_ss_flags(regs->usp), - &frame->uc.uc_stack.ss_flags); - err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); - err |= setup_sigframe(&frame->uc.uc_mcontext, regs); - err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); - + err |= __put_user(NULL, &frame->uc.uc_link); + err |= __save_altstack(&frame->uc.uc_stack, regs->usp); + err |= setup_sigcontext(frame, regs); + err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); if (err) - goto give_sigsegv; + return -EFAULT; - /* Set up registers for signal handler */ - regs->usp = (unsigned long)frame; - regs->pc = (unsigned long)ksig->ka.sa.sa_handler; - regs->lr = (unsigned long)vdso->rt_signal_retcode; + /* Set up to return from userspace. */ + regs->lr = (unsigned long)(vdso->rt_signal_retcode); -adjust_stack: - regs->a0 = ksig->sig; /* first arg is signo */ - regs->a1 = (unsigned long)(&(frame->info)); - regs->a2 = (unsigned long)(&(frame->uc)); - return err; + /* + * Set up registers for signal handler. + * Registers that we don't modify keep the value they had from + * user-space at the time we took the signal. + * We always pass siginfo and mcontext, regardless of SA_SIGINFO, + * since some things rely on this (e.g. glibc's debug/segfault.c). + */ + regs->pc = (unsigned long)ksig->ka.sa.sa_handler; + regs->usp = (unsigned long)frame; + regs->a0 = ksig->sig; /* a0: signal number */ + regs->a1 = (unsigned long)(&(frame->info)); /* a1: siginfo pointer */ + regs->a2 = (unsigned long)(&(frame->uc)); /* a2: ucontext pointer */ -give_sigsegv: - if (ksig->sig == SIGSEGV) - ksig->ka.sa.sa_handler = SIG_DFL; - force_sig(SIGSEGV, current); - goto adjust_stack; + return 0; } -/* - * OK, we're invoking a handler - */ -static int -handle_signal(struct ksignal *ksig, struct pt_regs *regs) +static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) { - int ret; sigset_t *oldset = sigmask_to_save(); + int ret; - /* - * set up the stack frame, regardless of SA_SIGINFO, - * and pass info anyway. - */ - ret = setup_rt_frame(ksig, oldset, regs); + /* Are we from a system call? */ + if (in_syscall(regs)) { + /* Avoid additional syscall restarting via ret_from_exception */ + forget_syscall(regs); + + /* If so, check system call restarting.. */ + switch (regs->a0) { + case -ERESTART_RESTARTBLOCK: + case -ERESTARTNOHAND: + regs->a0 = -EINTR; + break; - if (ret != 0) { - force_sigsegv(ksig->sig, current); - return ret; + case -ERESTARTSYS: + if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { + regs->a0 = -EINTR; + break; + } + /* fallthrough */ + case -ERESTARTNOINTR: + regs->a0 = regs->orig_a0; + regs->pc -= TRAP0_SIZE; + break; + } } - /* Block the signal if we were successful. */ - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked, ¤t->blocked, &ksig->ka.sa.sa_mask); - if (!(ksig->ka.sa.sa_flags & SA_NODEFER)) - sigaddset(¤t->blocked, ksig->sig); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); + /* Set up the stack frame */ + ret = setup_rt_frame(ksig, oldset, regs); - return 0; + signal_setup_done(ret, ksig, 0); } -/* - * Note that 'init' is a special process: it doesn't get signals it doesn't - * want to handle. Thus you cannot kill init even with a SIGKILL even by - * mistake. - * - * Note that we go through the signals twice: once to check the signals - * that the kernel can handle, and then we build all the user-level signal - * handling stack-frames in one go after that. - */ -static void do_signal(struct pt_regs *regs, int syscall) +static void do_signal(struct pt_regs *regs) { - unsigned int retval = 0, continue_addr = 0, restart_addr = 0; struct ksignal ksig; - /* - * We want the common case to go fast, which - * is why we may in certain cases get here from - * kernel mode. Just return without doing anything - * if so. - */ - if (!user_mode(regs)) + if (get_signal(&ksig)) { + /* Actually deliver the signal */ + handle_signal(&ksig, regs); return; + } - /* - * If we were from a system call, check for system call restarting... - */ - if (syscall) { - continue_addr = regs->pc; -#if defined(__CSKYABIV2__) - restart_addr = continue_addr - 4; -#else - restart_addr = continue_addr - 2; -#endif - retval = regs->a0; + /* Did we come from a system call? */ + if (in_syscall(regs)) { + /* Avoid additional syscall restarting via ret_from_exception */ + forget_syscall(regs); - /* - * Prepare for system call restart. We do this here so that a - * debugger will see the already changed. - */ - switch (retval) { + /* Restart the system call - no handlers present */ + switch (regs->a0) { case -ERESTARTNOHAND: case -ERESTARTSYS: case -ERESTARTNOINTR: regs->a0 = regs->orig_a0; - regs->pc = restart_addr; + regs->pc -= TRAP0_SIZE; break; case -ERESTART_RESTARTBLOCK: - regs->a0 = -EINTR; + regs->a0 = regs->orig_a0; + regs_syscallid(regs) = __NR_restart_syscall; + regs->pc -= TRAP0_SIZE; break; } } - if (try_to_freeze()) - goto no_signal; - /* - * Get the signal to deliver. When running under ptrace, at this - * point the debugger may change all our registers ... + * If there is no signal to deliver, we just put the saved + * sigmask back. */ - if (get_signal(&ksig)) { - /* - * Depending on the signal settings we may need to revert the - * decision to restart the system call. But skip this if a - * debugger has chosen to restart at a different PC. - */ - if (regs->pc == restart_addr) { - if (retval == -ERESTARTNOHAND || - (retval == -ERESTARTSYS && - !(ksig.ka.sa.sa_flags & SA_RESTART))) { - regs->a0 = -EINTR; - regs->pc = continue_addr; - } - } - - /* Whee! Actually deliver the signal. */ - if (handle_signal(&ksig, regs) == 0) { - /* - * A signal was successfully delivered; the saved - * sigmask will have been stored in the signal frame, - * and will be restored by sigreturn, so we can simply - * clear the TIF_RESTORE_SIGMASK flag. - */ - if (test_thread_flag(TIF_RESTORE_SIGMASK)) - clear_thread_flag(TIF_RESTORE_SIGMASK); - } - return; - } - -no_signal: - if (syscall) { - /* - * Handle restarting a different system call. As above, - * if a debugger has chosen to restart at a different PC, - * ignore the restart. - */ - if (retval == -ERESTART_RESTARTBLOCK - && regs->pc == continue_addr) { -#if defined(__CSKYABIV2__) - regs->regs[3] = __NR_restart_syscall; - regs->pc -= 4; -#else - regs->regs[9] = __NR_restart_syscall; - regs->pc -= 2; -#endif - } - - /* - * If there's no signal to deliver, we just put the saved - * sigmask back. - */ - if (test_thread_flag(TIF_RESTORE_SIGMASK)) { - clear_thread_flag(TIF_RESTORE_SIGMASK); - sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); - } - } + restore_saved_sigmask(); } -asmlinkage void -do_notify_resume(unsigned int thread_flags, struct pt_regs *regs, int syscall) +/* + * notification of userspace execution resumption + * - triggered by the _TIF_WORK_MASK flags + */ +asmlinkage void do_notify_resume(struct pt_regs *regs, + unsigned long thread_info_flags) { - if (thread_flags & _TIF_SIGPENDING) - do_signal(regs, syscall); + /* Handle pending signal delivery */ + if (thread_info_flags & _TIF_SIGPENDING) + do_signal(regs); - if (thread_flags & _TIF_NOTIFY_RESUME) { + if (thread_info_flags & _TIF_NOTIFY_RESUME) { clear_thread_flag(TIF_NOTIFY_RESUME); tracehook_notify_resume(regs); } diff --git a/arch/csky/lib/Makefile b/arch/csky/lib/Makefile index d1f368c59ef6..078e2d5f32e1 100644 --- a/arch/csky/lib/Makefile +++ b/arch/csky/lib/Makefile @@ -1 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only lib-y := usercopy.o delay.o diff --git a/arch/csky/mm/Makefile b/arch/csky/mm/Makefile index c870eb36efbc..4eebebdcd1bf 100644 --- a/arch/csky/mm/Makefile +++ b/arch/csky/mm/Makefile @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only ifeq ($(CONFIG_CPU_HAS_CACHEV2),y) obj-y += cachev2.o else diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c index d6f4b66b93e2..18041f46ded1 100644 --- a/arch/csky/mm/fault.c +++ b/arch/csky/mm/fault.c @@ -15,9 +15,9 @@ #include <linux/smp.h> #include <linux/version.h> #include <linux/vt_kern.h> -#include <linux/kernel.h> #include <linux/extable.h> #include <linux/uaccess.h> +#include <linux/perf_event.h> #include <asm/hardirq.h> #include <asm/mmu_context.h> @@ -82,7 +82,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write, unsigned long pgd_base; - pgd_base = tlb_get_pgd(); + pgd_base = (unsigned long)__va(get_pgd()); pgd = (pgd_t *)pgd_base + offset; pgd_k = init_mm.pgd + offset; @@ -107,6 +107,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write, return; } #endif + + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); /* * If we're in an interrupt or have no user * context, we must not take the fault.. @@ -154,10 +156,15 @@ good_area: goto bad_area; BUG(); } - if (fault & VM_FAULT_MAJOR) + if (fault & VM_FAULT_MAJOR) { tsk->maj_flt++; - else + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, + address); + } else { tsk->min_flt++; + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, + address); + } up_read(&mm->mmap_sem); return; |