diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/Kconfig | 42 | ||||
| -rw-r--r-- | arch/riscv/Kconfig.debug | 35 | ||||
| -rw-r--r-- | arch/riscv/Makefile | 2 | ||||
| -rw-r--r-- | arch/riscv/include/asm/Kbuild | 1 | ||||
| -rw-r--r-- | arch/riscv/include/asm/futex.h | 128 | ||||
| -rw-r--r-- | arch/riscv/include/uapi/asm/elf.h | 3 | ||||
| -rw-r--r-- | arch/riscv/kernel/cacheinfo.c | 7 | ||||
| -rw-r--r-- | arch/riscv/kernel/cpufeature.c | 7 | ||||
| -rw-r--r-- | arch/riscv/kernel/mcount.S | 1 | ||||
| -rw-r--r-- | arch/riscv/kernel/ptrace.c | 52 |
10 files changed, 231 insertions, 47 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index a63f9dbb4706..4198759f6798 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -31,6 +31,7 @@ config RISCV select HAVE_MEMBLOCK select HAVE_MEMBLOCK_NODE_MAP select HAVE_DMA_CONTIGUOUS + select HAVE_FUTEX_CMPXCHG if FUTEX select HAVE_GENERIC_DMA_COHERENT select HAVE_PERF_EVENTS select IRQ_DOMAIN @@ -112,6 +113,7 @@ config ARCH_RV32I config ARCH_RV64I bool "RV64I" select 64BIT + select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FTRACE_MCOUNT_RECORD @@ -219,12 +221,50 @@ config FPU endmenu -menu "Kernel type" +menu "Kernel features" source "kernel/Kconfig.hz" endmenu +menu "Boot options" + +config CMDLINE_BOOL + bool "Built-in kernel command line" + help + For most platforms, it is firmware or second stage bootloader + that by default specifies the kernel command line options. + However, it might be necessary or advantageous to either override + the default kernel command line or add a few extra options to it. + For such cases, this option allows hardcoding command line options + directly into the kernel. + + For that, choose 'Y' here and fill in the extra boot parameters + in CONFIG_CMDLINE. + + The built-in options will be concatenated to the default command + line if CMDLINE_FORCE is set to 'N'. Otherwise, the default + command line will be ignored and replaced by the built-in string. + +config CMDLINE + string "Built-in kernel command string" + depends on CMDLINE_BOOL + default "" + help + Supply command-line options at build time by entering them here. + +config CMDLINE_FORCE + bool "Built-in command line overrides bootloader arguments" + depends on CMDLINE_BOOL + help + Set this option to 'Y' to have the kernel ignore the bootloader + or firmware command line. Instead, the built-in command line + will be used exclusively. + + If you don't know what to do here, say N. + +endmenu + menu "Bus support" config PCI diff --git a/arch/riscv/Kconfig.debug b/arch/riscv/Kconfig.debug index 3224ff6ecf6e..c5a72f17c469 100644 --- a/arch/riscv/Kconfig.debug +++ b/arch/riscv/Kconfig.debug @@ -1,37 +1,2 @@ - -config CMDLINE_BOOL - bool "Built-in kernel command line" - help - For most platforms, it is firmware or second stage bootloader - that by default specifies the kernel command line options. - However, it might be necessary or advantageous to either override - the default kernel command line or add a few extra options to it. - For such cases, this option allows hardcoding command line options - directly into the kernel. - - For that, choose 'Y' here and fill in the extra boot parameters - in CONFIG_CMDLINE. - - The built-in options will be concatenated to the default command - line if CMDLINE_FORCE is set to 'N'. Otherwise, the default - command line will be ignored and replaced by the built-in string. - -config CMDLINE - string "Built-in kernel command string" - depends on CMDLINE_BOOL - default "" - help - Supply command-line options at build time by entering them here. - -config CMDLINE_FORCE - bool "Built-in command line overrides bootloader arguments" - depends on CMDLINE_BOOL - help - Set this option to 'Y' to have the kernel ignore the bootloader - or firmware command line. Instead, the built-in command line - will be used exclusively. - - If you don't know what to do here, say N. - config EARLY_PRINTK def_bool y diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 901770fc9bd2..d10146197533 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -25,8 +25,6 @@ ifeq ($(CONFIG_ARCH_RV64I),y) KBUILD_CFLAGS += -mabi=lp64 KBUILD_AFLAGS += -mabi=lp64 - - KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128) KBUILD_LDFLAGS += -melf64lriscv else diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild index efdbe311e936..6a646d9ea780 100644 --- a/arch/riscv/include/asm/Kbuild +++ b/arch/riscv/include/asm/Kbuild @@ -13,7 +13,6 @@ generic-y += errno.h generic-y += exec.h generic-y += fb.h generic-y += fcntl.h -generic-y += futex.h generic-y += hardirq.h generic-y += hash.h generic-y += hw_irq.h diff --git a/arch/riscv/include/asm/futex.h b/arch/riscv/include/asm/futex.h new file mode 100644 index 000000000000..3b19eba1bc8e --- /dev/null +++ b/arch/riscv/include/asm/futex.h @@ -0,0 +1,128 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2006 Ralf Baechle (ralf@linux-mips.org) + * Copyright (c) 2018 Jim Wilson (jimw@sifive.com) + */ + +#ifndef _ASM_FUTEX_H +#define _ASM_FUTEX_H + +#ifndef CONFIG_RISCV_ISA_A +/* + * Use the generic interrupt disabling versions if the A extension + * is not supported. + */ +#ifdef CONFIG_SMP +#error "Can't support generic futex calls without A extension on SMP" +#endif +#include <asm-generic/futex.h> + +#else /* CONFIG_RISCV_ISA_A */ + +#include <linux/futex.h> +#include <linux/uaccess.h> +#include <linux/errno.h> +#include <asm/asm.h> + +#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ +{ \ + uintptr_t tmp; \ + __enable_user_access(); \ + __asm__ __volatile__ ( \ + "1: " insn " \n" \ + "2: \n" \ + " .section .fixup,\"ax\" \n" \ + " .balign 4 \n" \ + "3: li %[r],%[e] \n" \ + " jump 2b,%[t] \n" \ + " .previous \n" \ + " .section __ex_table,\"a\" \n" \ + " .balign " RISCV_SZPTR " \n" \ + " " RISCV_PTR " 1b, 3b \n" \ + " .previous \n" \ + : [r] "+r" (ret), [ov] "=&r" (oldval), \ + [u] "+m" (*uaddr), [t] "=&r" (tmp) \ + : [op] "Jr" (oparg), [e] "i" (-EFAULT) \ + : "memory"); \ + __disable_user_access(); \ +} + +static inline int +arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr) +{ + int oldval = 0, ret = 0; + + pagefault_disable(); + + switch (op) { + case FUTEX_OP_SET: + __futex_atomic_op("amoswap.w.aqrl %[ov],%z[op],%[u]", + ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_ADD: + __futex_atomic_op("amoadd.w.aqrl %[ov],%z[op],%[u]", + ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_OR: + __futex_atomic_op("amoor.w.aqrl %[ov],%z[op],%[u]", + ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_ANDN: + __futex_atomic_op("amoand.w.aqrl %[ov],%z[op],%[u]", + ret, oldval, uaddr, ~oparg); + break; + case FUTEX_OP_XOR: + __futex_atomic_op("amoxor.w.aqrl %[ov],%z[op],%[u]", + ret, oldval, uaddr, oparg); + break; + default: + ret = -ENOSYS; + } + + pagefault_enable(); + + if (!ret) + *oval = oldval; + + return ret; +} + +static inline int +futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, + u32 oldval, u32 newval) +{ + int ret = 0; + u32 val; + uintptr_t tmp; + + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) + return -EFAULT; + + __enable_user_access(); + __asm__ __volatile__ ( + "1: lr.w.aqrl %[v],%[u] \n" + " bne %[v],%z[ov],3f \n" + "2: sc.w.aqrl %[t],%z[nv],%[u] \n" + " bnez %[t],1b \n" + "3: \n" + " .section .fixup,\"ax\" \n" + " .balign 4 \n" + "4: li %[r],%[e] \n" + " jump 3b,%[t] \n" + " .previous \n" + " .section __ex_table,\"a\" \n" + " .balign " RISCV_SZPTR " \n" + " " RISCV_PTR " 1b, 4b \n" + " " RISCV_PTR " 2b, 4b \n" + " .previous \n" + : [r] "+r" (ret), [v] "=&r" (val), [u] "+m" (*uaddr), [t] "=&r" (tmp) + : [ov] "Jr" (oldval), [nv] "Jr" (newval), [e] "i" (-EFAULT) + : "memory"); + __disable_user_access(); + + *uval = val; + return ret; +} + +#endif /* CONFIG_RISCV_ISA_A */ +#endif /* _ASM_FUTEX_H */ diff --git a/arch/riscv/include/uapi/asm/elf.h b/arch/riscv/include/uapi/asm/elf.h index 1e0dfc36aab9..644a00ce6e2e 100644 --- a/arch/riscv/include/uapi/asm/elf.h +++ b/arch/riscv/include/uapi/asm/elf.h @@ -19,7 +19,10 @@ typedef unsigned long elf_greg_t; typedef struct user_regs_struct elf_gregset_t; #define ELF_NGREG (sizeof(elf_gregset_t) / sizeof(elf_greg_t)) +/* We don't support f without d, or q. */ +typedef __u64 elf_fpreg_t; typedef union __riscv_fp_state elf_fpregset_t; +#define ELF_NFPREG (sizeof(struct __riscv_d_ext_state) / sizeof(elf_fpreg_t)) #if __riscv_xlen == 64 #define ELF_RISCV_R_SYM(r_info) ELF64_R_SYM(r_info) diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c index 0bc86e5f8f3f..cb35ffd8ec6b 100644 --- a/arch/riscv/kernel/cacheinfo.c +++ b/arch/riscv/kernel/cacheinfo.c @@ -22,13 +22,6 @@ static void ci_leaf_init(struct cacheinfo *this_leaf, { this_leaf->level = level; this_leaf->type = type; - /* not a sector cache */ - this_leaf->physical_line_partition = 1; - /* TODO: Add to DTS */ - this_leaf->attributes = - CACHE_WRITE_BACK - | CACHE_READ_ALLOCATE - | CACHE_WRITE_ALLOCATE; } static int __init_cache_level(unsigned int cpu) diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 46942e635266..5493f3228704 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -60,6 +60,13 @@ void riscv_fill_hwcap(void) for (i = 0; i < strlen(isa); ++i) elf_hwcap |= isa2hwcap[(unsigned char)(isa[i])]; + /* We don't support systems with F but without D, so mask those out + * here. */ + if ((elf_hwcap & COMPAT_HWCAP_ISA_F) && !(elf_hwcap & COMPAT_HWCAP_ISA_D)) { + pr_info("This kernel does not support systems with F but not D"); + elf_hwcap &= ~COMPAT_HWCAP_ISA_F; + } + pr_info("elf_hwcap is 0x%lx", elf_hwcap); #ifdef CONFIG_FPU diff --git a/arch/riscv/kernel/mcount.S b/arch/riscv/kernel/mcount.S index 5721624886a1..8a5593ff9ff3 100644 --- a/arch/riscv/kernel/mcount.S +++ b/arch/riscv/kernel/mcount.S @@ -75,7 +75,6 @@ ENTRY(return_to_handler) RESTORE_RET_ABI_STATE jalr a1 ENDPROC(return_to_handler) -EXPORT_SYMBOL(return_to_handler) #endif #ifndef CONFIG_DYNAMIC_FTRACE diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c index 9f82a7e34c64..60f1e02eed36 100644 --- a/arch/riscv/kernel/ptrace.c +++ b/arch/riscv/kernel/ptrace.c @@ -28,6 +28,9 @@ enum riscv_regset { REGSET_X, +#ifdef CONFIG_FPU + REGSET_F, +#endif }; static int riscv_gpr_get(struct task_struct *target, @@ -54,6 +57,45 @@ static int riscv_gpr_set(struct task_struct *target, return ret; } +#ifdef CONFIG_FPU +static int riscv_fpr_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + int ret; + struct __riscv_d_ext_state *fstate = &target->thread.fstate; + + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, fstate, 0, + offsetof(struct __riscv_d_ext_state, fcsr)); + if (!ret) { + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, fstate, 0, + offsetof(struct __riscv_d_ext_state, fcsr) + + sizeof(fstate->fcsr)); + } + + return ret; +} + +static int riscv_fpr_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int ret; + struct __riscv_d_ext_state *fstate = &target->thread.fstate; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, fstate, 0, + offsetof(struct __riscv_d_ext_state, fcsr)); + if (!ret) { + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, fstate, 0, + offsetof(struct __riscv_d_ext_state, fcsr) + + sizeof(fstate->fcsr)); + } + + return ret; +} +#endif static const struct user_regset riscv_user_regset[] = { [REGSET_X] = { @@ -64,6 +106,16 @@ static const struct user_regset riscv_user_regset[] = { .get = &riscv_gpr_get, .set = &riscv_gpr_set, }, +#ifdef CONFIG_FPU + [REGSET_F] = { + .core_note_type = NT_PRFPREG, + .n = ELF_NFPREG, + .size = sizeof(elf_fpreg_t), + .align = sizeof(elf_fpreg_t), + .get = &riscv_fpr_get, + .set = &riscv_fpr_set, + }, +#endif }; static const struct user_regset_view riscv_user_native_view = { |