From: Greentime Hu <greentime@xxxxxxxxxxxxx> This patch adds VDSO support. The VDSO code is currently used for sys_rt_sigreturn() and optimised gettimeofday() (using the SoC timer counter). Signed-off-by: Vincent Chen <vincentc@xxxxxxxxxxxxx> Signed-off-by: Greentime Hu <greentime@xxxxxxxxxxxxx> --- arch/nds32/include/asm/vdso.h | 35 ++++ arch/nds32/include/asm/vdso_datapage.h | 51 ++++++ arch/nds32/kernel/vdso.c | 245 +++++++++++++++++++++++++ arch/nds32/kernel/vdso/Makefile | 82 +++++++++ arch/nds32/kernel/vdso/datapage.S | 34 ++++ arch/nds32/kernel/vdso/gen_vdso_offsets.sh | 15 ++ arch/nds32/kernel/vdso/gettimeofday.c | 266 ++++++++++++++++++++++++++++ arch/nds32/kernel/vdso/note.S | 29 +++ arch/nds32/kernel/vdso/sigreturn.S | 36 ++++ arch/nds32/kernel/vdso/vdso.S | 33 ++++ arch/nds32/kernel/vdso/vdso.lds.S | 87 +++++++++ 11 files changed, 913 insertions(+) create mode 100644 arch/nds32/include/asm/vdso.h create mode 100644 arch/nds32/include/asm/vdso_datapage.h create mode 100644 arch/nds32/kernel/vdso.c create mode 100644 arch/nds32/kernel/vdso/Makefile create mode 100644 arch/nds32/kernel/vdso/datapage.S create mode 100755 arch/nds32/kernel/vdso/gen_vdso_offsets.sh create mode 100644 arch/nds32/kernel/vdso/gettimeofday.c create mode 100644 arch/nds32/kernel/vdso/note.S create mode 100644 arch/nds32/kernel/vdso/sigreturn.S create mode 100644 arch/nds32/kernel/vdso/vdso.S create mode 100644 arch/nds32/kernel/vdso/vdso.lds.S diff --git a/arch/nds32/include/asm/vdso.h b/arch/nds32/include/asm/vdso.h new file mode 100644 index 0000000..7298c49 --- /dev/null +++ b/arch/nds32/include/asm/vdso.h @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ASM_VDSO_H +#define __ASM_VDSO_H + +#ifdef __KERNEL__ + +#ifndef __ASSEMBLY__ + +#include <generated/vdso-offsets.h> + +#define VDSO_SYMBOL(base, name) \ +({ \ + (unsigned long)(vdso_offset_##name + (unsigned long)(base)); \ +}) + +#endif /* !__ASSEMBLY__ */ + +#endif /* __KERNEL__ */ + +#endif /* __ASM_VDSO_H */ diff --git a/arch/nds32/include/asm/vdso_datapage.h b/arch/nds32/include/asm/vdso_datapage.h new file mode 100644 index 0000000..ffae33c --- /dev/null +++ b/arch/nds32/include/asm/vdso_datapage.h @@ -0,0 +1,51 @@ +/* + * Adapted from arm64 version. + * + * Copyright (C) 2012 ARM Limited + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#ifndef __ASM_VDSO_DATAPAGE_H +#define __ASM_VDSO_DATAPAGE_H + +#ifdef __KERNEL__ + +#ifndef __ASSEMBLY__ + +struct vdso_data { + bool cycle_count_down; /* timer cyclye counter is decrease with time */ + u32 cycle_count_offset; /* offset of timer cycle counter register */ + u32 seq_count; /* sequence count - odd during updates */ + u32 xtime_coarse_sec; /* coarse time */ + u32 xtime_coarse_nsec; + + u32 wtm_clock_sec; /* wall to monotonic offset */ + u32 wtm_clock_nsec; + u32 xtime_clock_sec; /* CLOCK_REALTIME - seconds */ + u32 cs_mult; /* clocksource multiplier */ + u32 cs_shift; /* Cycle to nanosecond divisor (power of two) */ + + u64 cs_cycle_last; /* last cycle value */ + u64 cs_mask; /* clocksource mask */ + + u64 xtime_clock_nsec; /* CLOCK_REALTIME sub-ns base */ + u32 tz_minuteswest; /* timezone info for gettimeofday(2) */ + u32 tz_dsttime; +}; + +#endif /* !__ASSEMBLY__ */ + +#endif /* __KERNEL__ */ + +#endif /* __ASM_VDSO_DATAPAGE_H */ diff --git a/arch/nds32/kernel/vdso.c b/arch/nds32/kernel/vdso.c new file mode 100644 index 0000000..258c8a7 --- /dev/null +++ b/arch/nds32/kernel/vdso.c @@ -0,0 +1,245 @@ +/* + * VDSO implementation for AArch64 and vector page setup for AArch32. + * + * Copyright (C) 2012 ARM Limited + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * Author: Will Deacon <will.deacon@xxxxxxx> + */ + +#include <linux/cache.h> +#include <linux/clocksource.h> +#include <linux/elf.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/gfp.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/signal.h> +#include <linux/slab.h> +#include <linux/timekeeper_internal.h> +#include <linux/vmalloc.h> + +#include <linux/platform_device.h> +#include <linux/of_address.h> +#include <asm/cacheflush.h> +#include <asm/vdso.h> +#include <asm/vdso_datapage.h> +#include <linux/random.h> +#include <asm/cache_info.h> +extern struct cache_info L1_cache_info[2]; +extern char vdso_start, vdso_end; +static unsigned long vdso_pages __ro_after_init; +struct resource timer_res; + +/* + * The vDSO data page. + */ +static struct page *no_pages[] = { NULL }; + +static union { + struct vdso_data data; + u8 page[PAGE_SIZE]; +} vdso_data_store __page_aligned_data; +struct vdso_data *vdso_data = &vdso_data_store.data; +static struct vm_special_mapping vdso_spec[2] __ro_after_init = { + { + .name = "[vvar]", + .pages = no_pages, + }, + { + .name = "[vdso]", + }, +}; + +static int grab_timer_node_info(void) +{ + struct device_node *timer_node; + + timer_node = of_find_node_by_name(NULL, "timer"); + of_property_read_u32(timer_node, "cycle-count-offset", + &vdso_data->cycle_count_offset); + vdso_data->cycle_count_down = + of_property_read_bool(timer_node, "cycle-count-down"); + return of_address_to_resource(timer_node, 0, &timer_res); +} + +static int __init vdso_init(void) +{ + int i; + struct page **vdso_pagelist; + + if (memcmp(&vdso_start, "\177ELF", 4)) { + pr_err("vDSO is not a valid ELF object!\n"); + return -EINVAL; + } + /* Creat a timer io mapping to get clock cycles counter */ + if (grab_timer_node_info()) + return -ENODEV; + + vdso_pages = (&vdso_end - &vdso_start) >> PAGE_SHIFT; + pr_info("vdso: %ld pages (%ld code @ %p, %ld data @ %p)\n", + vdso_pages + 1, vdso_pages, &vdso_start, 1L, vdso_data); + + /* Allocate the vDSO pagelist */ + vdso_pagelist = kcalloc(vdso_pages, sizeof(struct page *), GFP_KERNEL); + if (vdso_pagelist == NULL) + return -ENOMEM; + + for (i = 0; i < vdso_pages; i++) + vdso_pagelist[i] = virt_to_page(&vdso_start + i * PAGE_SIZE); + vdso_spec[1].pages = &vdso_pagelist[0]; + + return 0; +} + +arch_initcall(vdso_init); + +unsigned long inline vdso_random_addr(unsigned long vdso_mapping_len) +{ + unsigned long start = current->mm->mmap_base, end, offset, addr; + start = PAGE_ALIGN(start); + + /* Round the lowest possible end address up to a PMD boundary. */ + end = (start + vdso_mapping_len + PMD_SIZE - 1) & PMD_MASK; + if (end >= TASK_SIZE) + end = TASK_SIZE; + end -= vdso_mapping_len; + + if (end > start) { + offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1); + addr = start + (offset << PAGE_SHIFT); + } else { + addr = start; + } + return addr; +} + +int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) +{ + struct mm_struct *mm = current->mm; + unsigned long vdso_base, vdso_text_len, vdso_mapping_len; + struct vm_area_struct *vma; + unsigned long addr = 0; + pgprot_t prot; + int ret; + + vdso_text_len = vdso_pages << PAGE_SHIFT; + /* Be sure to map the data page */ + vdso_mapping_len = vdso_text_len + 2 * PAGE_SIZE; +#ifdef CONFIG_CPU_CACHE_ALIASING + vdso_mapping_len += L1_cache_info[DCACHE].aliasing_num - 1; +#endif + + if (down_write_killable(&mm->mmap_sem)) + return -EINTR; + + addr = vdso_random_addr(vdso_mapping_len); + vdso_base = get_unmapped_area(NULL, addr, vdso_mapping_len, 0, 0); + if (IS_ERR_VALUE(vdso_base)) { + ret = vdso_base; + goto up_fail; + } + +#ifdef CONFIG_CPU_CACHE_ALIASING + { + unsigned int aliasing_mask = + L1_cache_info[DCACHE].aliasing_mask; + unsigned int page_colour_ofs; + page_colour_ofs = ((unsigned int)vdso_data & aliasing_mask) - + (vdso_base & aliasing_mask); + vdso_base += page_colour_ofs & aliasing_mask; + } +#endif + + vma = _install_special_mapping(mm, vdso_base, 2 * PAGE_SIZE, + VM_READ | VM_MAYREAD, &vdso_spec[0]); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + goto up_fail; + } + + /*Map vdata to user space */ + ret = io_remap_pfn_range(vma, vdso_base, + virt_to_phys(vdso_data) >> PAGE_SHIFT, + PAGE_SIZE, vma->vm_page_prot); + if (ret) + goto up_fail; + + /*Map timer to user space */ + vdso_base += PAGE_SIZE; + prot = __pgprot(_PAGE_V | _PAGE_M_UR_KR | _PAGE_D | + _PAGE_G | _PAGE_C_DEV); + ret = io_remap_pfn_range(vma, vdso_base, timer_res.start >> PAGE_SHIFT, + PAGE_SIZE, prot); + if (ret) + goto up_fail; + + /*Map vdso to user space */ + vdso_base += PAGE_SIZE; + mm->context.vdso = (void *)vdso_base; + vma = _install_special_mapping(mm, vdso_base, vdso_text_len, + VM_READ | VM_EXEC | + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, + &vdso_spec[1]); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + goto up_fail; + } + + up_write(&mm->mmap_sem); + return 0; + +up_fail: + mm->context.vdso = NULL; + up_write(&mm->mmap_sem); + return ret; +} + +static void vdso_write_begin(struct vdso_data *vdata) +{ + ++vdso_data->seq_count; + smp_wmb(); /* Pairs with smp_rmb in vdso_read_retry */ +} + +static void vdso_write_end(struct vdso_data *vdata) +{ + smp_wmb(); /* Pairs with smp_rmb in vdso_read_begin */ + ++vdso_data->seq_count; +} + +void update_vsyscall(struct timekeeper *tk) +{ + vdso_write_begin(vdso_data); + vdso_data->cs_mask = tk->tkr_mono.mask; + vdso_data->cs_mult = tk->tkr_mono.mult; + vdso_data->cs_shift = tk->tkr_mono.shift; + vdso_data->cs_cycle_last = tk->tkr_mono.cycle_last; + vdso_data->wtm_clock_sec = tk->wall_to_monotonic.tv_sec; + vdso_data->wtm_clock_nsec = tk->wall_to_monotonic.tv_nsec; + vdso_data->xtime_clock_sec = tk->xtime_sec; + vdso_data->xtime_clock_nsec = tk->tkr_mono.xtime_nsec; + vdso_data->xtime_coarse_sec = tk->xtime_sec; + vdso_data->xtime_coarse_nsec = tk->tkr_mono.xtime_nsec >> + tk->tkr_mono.shift; + vdso_write_end(vdso_data); +} + +void update_vsyscall_tz(void) +{ + vdso_data->tz_minuteswest = sys_tz.tz_minuteswest; + vdso_data->tz_dsttime = sys_tz.tz_dsttime; +} diff --git a/arch/nds32/kernel/vdso/Makefile b/arch/nds32/kernel/vdso/Makefile new file mode 100644 index 0000000..e6c50a7 --- /dev/null +++ b/arch/nds32/kernel/vdso/Makefile @@ -0,0 +1,82 @@ +# +# Building a vDSO image for AArch64. +# +# Author: Will Deacon <will.deacon@xxxxxxx> +# Heavily based on the vDSO Makefiles for other archs. +# + +obj-vdso := note.o datapage.o sigreturn.o gettimeofday.o + +# Build rules +targets := $(obj-vdso) vdso.so vdso.so.dbg +obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) + +ccflags-y := -shared -fno-common -fno-builtin +ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 \ + $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) +ccflags-y += -fPIC -Wl,-shared -g + +# Disable gcov profiling for VDSO code +GCOV_PROFILE := n + + +obj-y += vdso.o +extra-y += vdso.lds +CPPFLAGS_vdso.lds += -P -C -U$(ARCH) + +# Force dependency +$(obj)/vdso.o : $(obj)/vdso.so + +# Link rule for the .so file, .lds has to be first +$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) + $(call if_changed,vdsold) + + +# Strip rule for the .so file +$(obj)/%.so: OBJCOPYFLAGS := -S +$(obj)/%.so: $(obj)/%.so.dbg FORCE + $(call if_changed,objcopy) + +# Generate VDSO offsets using helper script +gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh +quiet_cmd_vdsosym = VDSOSYM $@ +define cmd_vdsosym + $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ +endef + +include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE + $(call if_changed,vdsosym) + + + +# Assembly rules for the .S files + +sigreturn.o : sigreturn.S + $(call if_changed_dep,vdsoas) + +note.o : note.S + $(call if_changed_dep,vdsoas) + +datapage.o : datapage.S + $(call if_changed_dep,vdsoas) + +gettimeofday.o : gettimeofday.c FORCE + $(call if_changed_dep,vdsocc) + +# Actual build commands +quiet_cmd_vdsold = VDSOL $@ + cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $^ -o $@ +quiet_cmd_vdsoas = VDSOA $@ + cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $< +quiet_cmd_vdsocc = VDSOA $@ + cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $< + +# Install commands for the unstripped file +quiet_cmd_vdso_install = INSTALL $@ + cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ + +vdso.so: $(obj)/vdso.so.dbg + @mkdir -p $(MODLIB)/vdso + $(call cmd,vdso_install) + +vdso_install: vdso.so diff --git a/arch/nds32/kernel/vdso/datapage.S b/arch/nds32/kernel/vdso/datapage.S new file mode 100644 index 0000000..d86af66 --- /dev/null +++ b/arch/nds32/kernel/vdso/datapage.S @@ -0,0 +1,34 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/linkage.h> +#include <asm/page.h> + +ENTRY(__get_timerpage) + sethi $r0, hi20(. + PAGE_SIZE + 8) + ori $r0, $r0, lo12(. + PAGE_SIZE + 4) + mfusr $r1, $pc + sub $r0, $r1, $r0 + ret +ENDPROC(__get_timerpage) + +ENTRY(__get_datapage) + sethi $r0, hi20(. + 2*PAGE_SIZE + 8) + ori $r0, $r0, lo12(. + 2*PAGE_SIZE + 4) + mfusr $r1, $pc + sub $r0, $r1, $r0 + ret +ENDPROC(__get_datapage) diff --git a/arch/nds32/kernel/vdso/gen_vdso_offsets.sh b/arch/nds32/kernel/vdso/gen_vdso_offsets.sh new file mode 100755 index 0000000..01924ff --- /dev/null +++ b/arch/nds32/kernel/vdso/gen_vdso_offsets.sh @@ -0,0 +1,15 @@ +#!/bin/sh + +# +# Match symbols in the DSO that look like VDSO_*; produce a header file +# of constant offsets into the shared object. +# +# Doing this inside the Makefile will break the $(filter-out) function, +# causing Kbuild to rebuild the vdso-offsets header file every time. +# +# Author: Will Deacon <will.deacon@xxxxxxx +# + +LC_ALL=C +sed -n -e 's/^00*/0/' -e \ +'s/^\([0-9a-fA-F]*\) . VDSO_\([a-zA-Z0-9_]*\)$/\#define vdso_offset_\2\t0x\1/p' diff --git a/arch/nds32/kernel/vdso/gettimeofday.c b/arch/nds32/kernel/vdso/gettimeofday.c new file mode 100644 index 0000000..8591b55 --- /dev/null +++ b/arch/nds32/kernel/vdso/gettimeofday.c @@ -0,0 +1,266 @@ +/* + * Copyright 2015 Mentor Graphics Corporation. + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; version 2 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/compiler.h> +#include <linux/hrtimer.h> +#include <linux/time.h> +#include <asm/io.h> +#include <asm/barrier.h> +#include <asm/bug.h> +#include <asm/page.h> +#include <asm/unistd.h> +#include <asm/vdso_datapage.h> +#include <asm/asm-offsets.h> + +#define X(x) #x +#define Y(x) X(x) + +extern struct vdso_data *__get_datapage(void); +extern struct vdso_data *__get_timerpage(void); + +static notrace unsigned int __vdso_read_begin(const struct vdso_data *vdata) +{ + u32 seq; +repeat: + seq = ACCESS_ONCE(vdata->seq_count); + if (seq & 1) { + cpu_relax(); + goto repeat; + } + return seq; +} + +static notrace unsigned int vdso_read_begin(const struct vdso_data *vdata) +{ + unsigned int seq; + + seq = __vdso_read_begin(vdata); + + smp_rmb(); /* Pairs with smp_wmb in vdso_write_end */ + return seq; +} + +static notrace int vdso_read_retry(const struct vdso_data *vdata, u32 start) +{ + smp_rmb(); /* Pairs with smp_wmb in vdso_write_begin */ + return vdata->seq_count != start; +} + +static notrace long clock_gettime_fallback(clockid_t _clkid, + struct timespec *_ts) +{ + register struct timespec *ts asm("$r1") = _ts; + register clockid_t clkid asm("$r0") = _clkid; + register long ret asm("$r0"); + + asm volatile ( + "movi $r15, %3\n" + "syscall 0x0\n" + :"=r"(ret) + :"r"(clkid), "r"(ts), "i"(__NR_clock_gettime) + :"$r15","memory"); + + return ret; +} + +static notrace int do_realtime_coarse(struct timespec *ts, + struct vdso_data *vdata) +{ + u32 seq; + + do { + seq = vdso_read_begin(vdata); + + ts->tv_sec = vdata->xtime_coarse_sec; + ts->tv_nsec = vdata->xtime_coarse_nsec; + + } while (vdso_read_retry(vdata, seq)); + return 0; +} + +static notrace int do_monotonic_coarse(struct timespec *ts, + struct vdso_data *vdata) +{ + struct timespec tomono; + u32 seq; + + do { + seq = vdso_read_begin(vdata); + + ts->tv_sec = vdata->xtime_coarse_sec; + ts->tv_nsec = vdata->xtime_coarse_nsec; + + tomono.tv_sec = vdata->wtm_clock_sec; + tomono.tv_nsec = vdata->wtm_clock_nsec; + + } while (vdso_read_retry(vdata, seq)); + + ts->tv_sec += tomono.tv_sec; + timespec_add_ns(ts, tomono.tv_nsec); + return 0; +} + +static inline u64 vgetsns(struct vdso_data *vdso) +{ + u32 cycle_now; + u32 cycle_delta; + u32 *timer_cycle_base; + + timer_cycle_base = + (u32 *) ((char *)__get_timerpage() + vdso->cycle_count_offset); + cycle_now = readl_relaxed(timer_cycle_base); + if (true == vdso->cycle_count_down) + cycle_now = ~(*timer_cycle_base); + cycle_delta = cycle_now - (u32) vdso->cs_cycle_last; + return ((u64) cycle_delta & vdso->cs_mask) * vdso->cs_mult; +} + +static notrace int do_realtime(struct timespec *ts, struct vdso_data *vdata) +{ + unsigned count; + u64 ns; + do { + count = vdso_read_begin(vdata); + ts->tv_sec = vdata->xtime_clock_sec; + ns = vdata->xtime_clock_nsec; + ns += vgetsns(vdata); + ns >>= vdata->cs_shift; + } while (vdso_read_retry(vdata, count)); + + ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns); + ts->tv_nsec = ns; + + return 0; +} + +static notrace int do_monotonic(struct timespec *ts, struct vdso_data *vdata) +{ + struct timespec tomono; + u64 nsecs; + u32 seq; + + do { + seq = vdso_read_begin(vdata); + + ts->tv_sec = vdata->xtime_clock_sec; + nsecs = vdata->xtime_clock_nsec; + nsecs += vgetsns(vdata); + nsecs >>= vdata->cs_shift; + + tomono.tv_sec = vdata->wtm_clock_sec; + tomono.tv_nsec = vdata->wtm_clock_nsec; + + } while (vdso_read_retry(vdata, seq)); + + ts->tv_sec += tomono.tv_sec; + ts->tv_nsec = 0; + timespec_add_ns(ts, nsecs + tomono.tv_nsec); + return 0; +} + +notrace int __vdso_clock_gettime(clockid_t clkid, struct timespec *ts) +{ + struct vdso_data *vdata; + int ret = -1; + + vdata = __get_datapage(); + + switch (clkid) { + case CLOCK_REALTIME_COARSE: + ret = do_realtime_coarse(ts, vdata); + break; + case CLOCK_MONOTONIC_COARSE: + ret = do_monotonic_coarse(ts, vdata); + break; + case CLOCK_REALTIME: + ret = do_realtime(ts, vdata); + break; + case CLOCK_MONOTONIC: + ret = do_monotonic(ts, vdata); + break; + default: + break; + } + + if (ret) + ret = clock_gettime_fallback(clkid, ts); + + return ret; +} + +static notrace long clock_getres_fallback(clockid_t _clk_id, + struct timespec *_res) +{ + register clockid_t clk_id asm("$r0") = _clk_id; + register struct timespec *res asm("$r1") = _res; + register long ret asm("$r0"); + + asm volatile ( + "movi $r15, %3\n" + "syscall 0x0\n" + :"=r"(ret) + :"r"(clk_id), "r"(res), "i"(__NR_clock_getres) + :"$r15","memory"); + + return ret; +} + +notrace int __vdso_clock_getres(clockid_t clk_id, struct timespec *res) +{ + if (res == NULL) + return -EFAULT; + switch (clk_id) { + case CLOCK_REALTIME: + case CLOCK_MONOTONIC: + case CLOCK_MONOTONIC_RAW: + res->tv_sec = 0; + res->tv_nsec = CLOCK_REALTIME_RES; + break; + case CLOCK_REALTIME_COARSE: + case CLOCK_MONOTONIC_COARSE: + res->tv_sec = 0; + res->tv_nsec = CLOCK_COARSE_RES; + break; + default: + clock_getres_fallback(clk_id, res); + break; + } + return 0; +} + +notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz) +{ + struct timespec ts; + struct vdso_data *vdata; + int ret; + + vdata = __get_datapage(); + + ret = do_realtime(&ts, vdata); + + if (tv) { + tv->tv_sec = ts.tv_sec; + tv->tv_usec = ts.tv_nsec / 1000; + } + if (tz) { + tz->tz_minuteswest = vdata->tz_minuteswest; + tz->tz_dsttime = vdata->tz_dsttime; + } + + return ret; +} diff --git a/arch/nds32/kernel/vdso/note.S b/arch/nds32/kernel/vdso/note.S new file mode 100644 index 0000000..59c6397 --- /dev/null +++ b/arch/nds32/kernel/vdso/note.S @@ -0,0 +1,29 @@ +/* + * Copyright (C) 2012 ARM Limited + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * Author: Will Deacon <will.deacon@xxxxxxx> + * + * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text. + * Here we can supply some information useful to userland. + */ + +#include <linux/uts.h> +#include <linux/version.h> +#include <linux/elfnote.h> + +ELFNOTE_START(Linux, 0, "a") + .long LINUX_VERSION_CODE +ELFNOTE_END diff --git a/arch/nds32/kernel/vdso/sigreturn.S b/arch/nds32/kernel/vdso/sigreturn.S new file mode 100644 index 0000000..8b4bd4e --- /dev/null +++ b/arch/nds32/kernel/vdso/sigreturn.S @@ -0,0 +1,36 @@ +/* + * Sigreturn trampoline for returning from a signal + * + * Copyright (C) 2012 ARM Limited + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * Author: Will Deacon <will.deacon@xxxxxxx> + */ + +#include <linux/linkage.h> +#include <asm/unistd.h> + + .text + +ENTRY(__kernel_rt_sigreturn) + .cfi_startproc + movi $r15, __NR_rt_sigreturn + /* + * The SWID of syscall should be __NR_rt_sigreturn to synchronize + * the unwinding scheme in gcc + */ + syscall __NR_rt_sigreturn + .cfi_endproc +ENDPROC(__kernel_rt_sigreturn) diff --git a/arch/nds32/kernel/vdso/vdso.S b/arch/nds32/kernel/vdso/vdso.S new file mode 100644 index 0000000..4444082 --- /dev/null +++ b/arch/nds32/kernel/vdso/vdso.S @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2012 ARM Limited + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * Author: Will Deacon <will.deacon@xxxxxxx> + */ + +#include <linux/init.h> +#include <linux/linkage.h> +#include <linux/const.h> +#include <asm/page.h> + + .globl vdso_start, vdso_end + .section .rodata + .balign PAGE_SIZE +vdso_start: + .incbin "arch/nds32/kernel/vdso/vdso.so" + .balign PAGE_SIZE +vdso_end: + + .previous diff --git a/arch/nds32/kernel/vdso/vdso.lds.S b/arch/nds32/kernel/vdso/vdso.lds.S new file mode 100644 index 0000000..9599db4 --- /dev/null +++ b/arch/nds32/kernel/vdso/vdso.lds.S @@ -0,0 +1,87 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + + +#include <linux/const.h> +#include <asm/page.h> +#include <asm/vdso.h> + +OUTPUT_FORMAT("elf32-nds32le-linux", "elf32-nds32be-linux", "elf32-nds32le-linux") +OUTPUT_ARCH(nds32) + +SECTIONS +{ + . = SIZEOF_HEADERS; + + .hash : { *(.hash) } :text + .gnu.hash : { *(.gnu.hash) } + .dynsym : { *(.dynsym) } + .dynstr : { *(.dynstr) } + .gnu.version : { *(.gnu.version) } + .gnu.version_d : { *(.gnu.version_d) } + .gnu.version_r : { *(.gnu.version_r) } + + .note : { *(.note.*) } :text :note + + + .text : { *(.text*) } :text + + .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr + .eh_frame : { KEEP (*(.eh_frame)) } :text + + .dynamic : { *(.dynamic) } :text :dynamic + + .rodata : { *(.rodata*) } :text + + + /DISCARD/ : { + *(.note.GNU-stack) + *(.data .data.* .gnu.linkonce.d.* .sdata*) + *(.bss .sbss .dynbss .dynsbss) + } +} + +/* + * We must supply the ELF program headers explicitly to get just one + * PT_LOAD segment, and set the flags explicitly to make segments read-only. + */ +PHDRS +{ + text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */ + dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ + note PT_NOTE FLAGS(4); /* PF_R */ + eh_frame_hdr PT_GNU_EH_FRAME; +} + +/* + * This controls what symbols we export from the DSO. + */ +VERSION +{ + LINUX_4 { + global: + __kernel_rt_sigreturn; + __vdso_gettimeofday; + __vdso_clock_getres; + __vdso_clock_gettime; + local: *; + }; +} + +/* + * Make the rt_sigreturn code visible to the kernel. + */ +VDSO_rt_sigtramp = __kernel_rt_sigreturn; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
