diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sh/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/sh/kernel/process.c | 2 | ||||
| -rw-r--r-- | arch/sh/kernel/signal.c | 17 | ||||
| -rw-r--r-- | arch/sh/kernel/vsyscall/Makefile | 36 | ||||
| -rw-r--r-- | arch/sh/kernel/vsyscall/vsyscall-note.S | 25 | ||||
| -rw-r--r-- | arch/sh/kernel/vsyscall/vsyscall-sigreturn.S | 39 | ||||
| -rw-r--r-- | arch/sh/kernel/vsyscall/vsyscall-syscall.S | 10 | ||||
| -rw-r--r-- | arch/sh/kernel/vsyscall/vsyscall-trapa.S | 42 | ||||
| -rw-r--r-- | arch/sh/kernel/vsyscall/vsyscall.c | 150 | ||||
| -rw-r--r-- | arch/sh/kernel/vsyscall/vsyscall.lds.S | 74 | ||||
| -rw-r--r-- | arch/sh/mm/Kconfig | 13 | ||||
| -rw-r--r-- | arch/sh/mm/init.c | 3 | ||||
| -rw-r--r-- | arch/sh/mm/tlb-flush.c | 18 |
13 files changed, 418 insertions, 12 deletions
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile index 0e2148f63e7..5da88a43d35 100644 --- a/arch/sh/kernel/Makefile +++ b/arch/sh/kernel/Makefile @@ -9,6 +9,7 @@ obj-y := process.o signal.o entry.o traps.o irq.o \ io.o io_generic.o sh_ksyms.o syscalls.o obj-y += cpu/ timers/ +obj-$(CONFIG_VSYSCALL) += vsyscall/ obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_CF_ENABLER) += cf-enabler.o diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c index 630ec1af248..0b1d5dd7a93 100644 --- a/arch/sh/kernel/process.c +++ b/arch/sh/kernel/process.c @@ -355,7 +355,7 @@ struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *ne else if (next->thread.ubc_pc && next->mm) { int asid = 0; #ifdef CONFIG_MMU - asid |= next->mm->context & MMU_CONTEXT_ASID_MASK; + asid |= next->mm->context.id & MMU_CONTEXT_ASID_MASK; #endif ubc_set_tracing(asid, next->thread.ubc_pc); } else { diff --git a/arch/sh/kernel/signal.c b/arch/sh/kernel/signal.c index 2f1c9545b49..5213f5bc6ce 100644 --- a/arch/sh/kernel/signal.c +++ b/arch/sh/kernel/signal.c @@ -8,7 +8,6 @@ * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima * */ - #include <linux/sched.h> #include <linux/mm.h> #include <linux/smp.h> @@ -21,6 +20,7 @@ #include <linux/unistd.h> #include <linux/stddef.h> #include <linux/tty.h> +#include <linux/elf.h> #include <linux/personality.h> #include <linux/binfmts.h> @@ -29,8 +29,6 @@ #include <asm/pgtable.h> #include <asm/cacheflush.h> -#undef DEBUG - #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) /* @@ -312,6 +310,11 @@ get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) return (void __user *)((sp - frame_size) & -8ul); } +/* These symbols are defined with the addresses in the vsyscall page. + See vsyscall-trapa.S. */ +extern void __user __kernel_sigreturn; +extern void __user __kernel_rt_sigreturn; + static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs) { @@ -340,6 +343,10 @@ static int setup_frame(int sig, struct k_sigaction *ka, already in userspace. */ if (ka->sa.sa_flags & SA_RESTORER) { regs->pr = (unsigned long) ka->sa.sa_restorer; +#ifdef CONFIG_VSYSCALL + } else if (likely(current->mm->context.vdso)) { + regs->pr = VDSO_SYM(&__kernel_sigreturn); +#endif } else { /* Generate return code (system call to sigreturn) */ err |= __put_user(MOVW(7), &frame->retcode[0]); @@ -416,6 +423,10 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, already in userspace. */ if (ka->sa.sa_flags & SA_RESTORER) { regs->pr = (unsigned long) ka->sa.sa_restorer; +#ifdef CONFIG_VSYSCALL + } else if (likely(current->mm->context.vdso)) { + regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); +#endif } else { /* Generate return code (system call to rt_sigreturn) */ err |= __put_user(MOVW(7), &frame->retcode[0]); diff --git a/arch/sh/kernel/vsyscall/Makefile b/arch/sh/kernel/vsyscall/Makefile new file mode 100644 index 00000000000..4bbce1cfa35 --- /dev/null +++ b/arch/sh/kernel/vsyscall/Makefile @@ -0,0 +1,36 @@ +obj-y += vsyscall.o vsyscall-syscall.o + +$(obj)/vsyscall-syscall.o: \ + $(foreach F,trapa,$(obj)/vsyscall-$F.so) + +# Teach kbuild about targets +targets += $(foreach F,trapa,vsyscall-$F.o vsyscall-$F.so) +targets += vsyscall-note.o vsyscall.lds + +# The DSO images are built using a special linker script +quiet_cmd_syscall = SYSCALL $@ + cmd_syscall = $(CC) -nostdlib $(SYSCFLAGS_$(@F)) \ + -Wl,-T,$(filter-out FORCE,$^) -o $@ + +export CPPFLAGS_vsyscall.lds += -P -C -Ush + +vsyscall-flags = -shared -s -Wl,-soname=linux-gate.so.1 \ + $(call ld-option, -Wl$(comma)--hash-style=sysv) + +SYSCFLAGS_vsyscall-trapa.so = $(vsyscall-flags) + +$(obj)/vsyscall-trapa.so: \ +$(obj)/vsyscall-%.so: $(src)/vsyscall.lds $(obj)/vsyscall-%.o FORCE + $(call if_changed,syscall) + +# We also create a special relocatable object that should mirror the symbol +# table and layout of the linked DSO. With ld -R we can then refer to +# these symbols in the kernel code rather than hand-coded addresses. +extra-y += vsyscall-syms.o +$(obj)/built-in.o: $(obj)/vsyscall-syms.o +$(obj)/built-in.o: ld_flags += -R $(obj)/vsyscall-syms.o + +SYSCFLAGS_vsyscall-syms.o = -r +$(obj)/vsyscall-syms.o: $(src)/vsyscall.lds \ + $(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE + $(call if_changed,syscall) diff --git a/arch/sh/kernel/vsyscall/vsyscall-note.S b/arch/sh/kernel/vsyscall/vsyscall-note.S new file mode 100644 index 00000000000..d4b5be4f3d5 --- /dev/null +++ b/arch/sh/kernel/vsyscall/vsyscall-note.S @@ -0,0 +1,25 @@ +/* + * 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> + +#define ASM_ELF_NOTE_BEGIN(name, flags, vendor, type) \ + .section name, flags; \ + .balign 4; \ + .long 1f - 0f; /* name length */ \ + .long 3f - 2f; /* data length */ \ + .long type; /* note type */ \ +0: .asciz vendor; /* vendor name */ \ +1: .balign 4; \ +2: + +#define ASM_ELF_NOTE_END \ +3: .balign 4; /* pad out section */ \ + .previous + + ASM_ELF_NOTE_BEGIN(".note.kernel-version", "a", UTS_SYSNAME, 0) + .long LINUX_VERSION_CODE + ASM_ELF_NOTE_END diff --git a/arch/sh/kernel/vsyscall/vsyscall-sigreturn.S b/arch/sh/kernel/vsyscall/vsyscall-sigreturn.S new file mode 100644 index 00000000000..555a64f124c --- /dev/null +++ b/arch/sh/kernel/vsyscall/vsyscall-sigreturn.S @@ -0,0 +1,39 @@ +#include <asm/unistd.h> + + .text + .balign 32 + .globl __kernel_sigreturn + .type __kernel_sigreturn,@function +__kernel_sigreturn: +.LSTART_sigreturn: + mov.w 1f, r3 + trapa #0x10 + or r0, r0 + or r0, r0 + or r0, r0 + or r0, r0 + or r0, r0 + +1: .short __NR_sigreturn +.LEND_sigreturn: + .size __kernel_sigreturn,.-.LSTART_sigreturn + + .balign 32 + .globl __kernel_rt_sigreturn + .type __kernel_rt_sigreturn,@function +__kernel_rt_sigreturn: +.LSTART_rt_sigreturn: + mov.w 1f, r3 + trapa #0x10 + or r0, r0 + or r0, r0 + or r0, r0 + or r0, r0 + or r0, r0 + +1: .short __NR_rt_sigreturn +.LEND_rt_sigreturn: + .size __kernel_rt_sigreturn,.-.LSTART_rt_sigreturn + + .section .eh_frame,"a",@progbits + .previous diff --git a/arch/sh/kernel/vsyscall/vsyscall-syscall.S b/arch/sh/kernel/vsyscall/vsyscall-syscall.S new file mode 100644 index 00000000000..c2ac7f0282b --- /dev/null +++ b/arch/sh/kernel/vsyscall/vsyscall-syscall.S @@ -0,0 +1,10 @@ +#include <linux/init.h> + +__INITDATA + + .globl vsyscall_trapa_start, vsyscall_trapa_end +vsyscall_trapa_start: + .incbin "arch/sh/kernel/vsyscall/vsyscall-trapa.so" +vsyscall_trapa_end: + +__FINIT diff --git a/arch/sh/kernel/vsyscall/vsyscall-trapa.S b/arch/sh/kernel/vsyscall/vsyscall-trapa.S new file mode 100644 index 00000000000..3b6eb34c43f --- /dev/null +++ b/arch/sh/kernel/vsyscall/vsyscall-trapa.S @@ -0,0 +1,42 @@ + .text + .globl __kernel_vsyscall + .type __kernel_vsyscall,@function +__kernel_vsyscall: +.LSTART_vsyscall: + /* XXX: We'll have to do something here once we opt to use the vDSO + * page for something other than the signal trampoline.. as well as + * fill out .eh_frame -- PFM. */ +.LEND_vsyscall: + .size __kernel_vsyscall,.-.LSTART_vsyscall + .previous + + .section .eh_frame,"a",@progbits +.LCIE: + .ualong .LCIE_end - .LCIE_start +.LCIE_start: + .ualong 0 /* CIE ID */ + .byte 0x1 /* Version number */ + .string "zRS" /* NUL-terminated augmentation string */ + .uleb128 0x1 /* Code alignment factor */ + .sleb128 -4 /* Data alignment factor */ + .byte 0x11 /* Return address register column */ + /* Augmentation length and data (none) */ + .byte 0xc /* DW_CFA_def_cfa */ + .uleb128 0xf /* r15 */ + .uleb128 0x0 /* offset 0 */ + + .align 2 +.LCIE_end: + + .ualong .LFDE_end-.LFDE_start /* Length FDE */ +.LFDE_start: + .ualong .LCIE /* CIE pointer */ + .ualong .LSTART_vsyscall-. /* start address */ + .ualong .LEND_vsyscall-.LSTART_vsyscall + .uleb128 0 + .align 2 +.LFDE_end: + .previous + +/* Get the common code for the sigreturn entry points */ +#include "vsyscall-sigreturn.S" diff --git a/arch/sh/kernel/vsyscall/vsyscall.c b/arch/sh/kernel/vsyscall/vsyscall.c new file mode 100644 index 00000000000..075d6cc1a2d --- /dev/null +++ b/arch/sh/kernel/vsyscall/vsyscall.c @@ -0,0 +1,150 @@ +/* + * arch/sh/kernel/vsyscall.c + * + * Copyright (C) 2006 Paul Mundt + * + * vDSO randomization + * Copyright(C) 2005-2006, Red Hat, Inc., Ingo Molnar + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/gfp.h> +#include <linux/module.h> +#include <linux/elf.h> + +/* + * Should the kernel map a VDSO page into processes and pass its + * address down to glibc upon exec()? + */ +unsigned int __read_mostly vdso_enabled = 1; +EXPORT_SYMBOL_GPL(vdso_enabled); + +static int __init vdso_setup(char *s) +{ + vdso_enabled = simple_strtoul(s, NULL, 0); + return 1; +} +__setup("vdso=", vdso_setup); + +/* + * These symbols are defined by vsyscall.o to mark the bounds + * of the ELF DSO images included therein. + */ +extern const char vsyscall_trapa_start, vsyscall_trapa_end; +static void *syscall_page; + +int __init vsyscall_init(void) +{ + syscall_page = (void *)get_zeroed_page(GFP_ATOMIC); + + /* + * XXX: Map this page to a fixmap entry if we get around + * to adding the page to ELF core dumps + */ + + memcpy(syscall_page, + &vsyscall_trapa_start, + &vsyscall_trapa_end - &vsyscall_trapa_start); + + return 0; +} + +static struct page *syscall_vma_nopage(struct vm_area_struct *vma, + unsigned long address, int *type) +{ + unsigned long offset = address - vma->vm_start; + struct page *page; + + if (address < vma->vm_start || address > vma->vm_end) + return NOPAGE_SIGBUS; + + page = virt_to_page(syscall_page + offset); + + get_page(page); + + return page; +} + +/* Prevent VMA merging */ +static void syscall_vma_close(struct vm_area_struct *vma) +{ +} + +static struct vm_operations_struct syscall_vm_ops = { + .nopage = syscall_vma_nopage, + .close = syscall_vma_close, +}; + +/* Setup a VMA at program startup for the vsyscall page */ +int arch_setup_additional_pages(struct linux_binprm *bprm, + int executable_stack) +{ + struct vm_area_struct *vma; + struct mm_struct *mm = current->mm; + unsigned long addr; + int ret; + + down_write(&mm->mmap_sem); + addr = get_unmapped_area(NULL, 0, PAGE_SIZE, 0, 0); + if (IS_ERR_VALUE(addr)) { + ret = addr; + goto up_fail; + } + + vma = kmem_cache_zalloc(vm_area_cachep, SLAB_KERNEL); + if (!vma) { + ret = -ENOMEM; + goto up_fail; + } + + vma->vm_start = addr; + vma->vm_end = addr + PAGE_SIZE; + /* MAYWRITE to allow gdb to COW and set breakpoints */ + vma->vm_flags = VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYEXEC|VM_MAYWRITE; + vma->vm_flags |= mm->def_flags; + vma->vm_page_prot = protection_map[vma->vm_flags & 7]; + vma->vm_ops = &syscall_vm_ops; + vma->vm_mm = mm; + + ret = insert_vm_struct(mm, vma); + if (unlikely(ret)) { + kmem_cache_free(vm_area_cachep, vma); + goto up_fail; + } + + current->mm->context.vdso = (void *)addr; + + mm->total_vm++; +up_fail: + up_write(&mm->mmap_sem); + return ret; +} + +const char *arch_vma_name(struct vm_area_struct *vma) +{ + if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) + return "[vdso]"; + + return NULL; +} + +struct vm_area_struct *get_gate_vma(struct task_struct *task) +{ + return NULL; +} + +int in_gate_area(struct task_struct *task, unsigned long address) +{ + return 0; +} + +int in_gate_area_no_task(unsigned long address) +{ + return 0; +} diff --git a/arch/sh/kernel/vsyscall/vsyscall.lds.S b/arch/sh/kernel/vsyscall/vsyscall.lds.S new file mode 100644 index 00000000000..b13c3d439fe --- /dev/null +++ b/arch/sh/kernel/vsyscall/vsyscall.lds.S @@ -0,0 +1,74 @@ +/* + * Linker script for vsyscall DSO. The vsyscall page is an ELF shared + * object prelinked to its virtual address, and with only one read-only + * segment (that fits in one page). This script controls its layout. + */ +#include <asm/asm-offsets.h> + +#ifdef CONFIG_CPU_LITTLE_ENDIAN +OUTPUT_FORMAT("elf32-sh-linux", "elf32-sh-linux", "elf32-sh-linux") +#else +OUTPUT_FORMAT("elf32-shbig-linux", "elf32-shbig-linux", "elf32-shbig-linux") +#endif +OUTPUT_ARCH(sh) + +/* The ELF entry point can be used to set the AT_SYSINFO value. */ +ENTRY(__kernel_vsyscall); + +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) } + + /* This linker script is used both with -r and with -shared. + For the layouts to match, we need to skip more than enough + space for the dynamic symbol table et al. If this amount + is insufficient, ld -shared will barf. Just increase it here. */ + . = 0x400; + + .text : { *(.text) } :text =0x90909090 + .note : { *(.note.*) } :text :note + .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr + .eh_frame : { KEEP (*(.eh_frame)) } :text + .dynamic : { *(.dynamic) } :text :dynamic + .useless : { + *(.got.plt) *(.got) + *(.data .data.* .gnu.linkonce.d.*) + *(.dynbss) + *(.bss .bss.* .gnu.linkonce.b.*) + } :text +} + +/* + * 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 FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */ + dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ + note PT_NOTE FLAGS(4); /* PF_R */ + eh_frame_hdr 0x6474e550; /* PT_GNU_EH_FRAME, but ld doesn't match the name */ +} + +/* + * This controls what symbols we export from the DSO. + */ +VERSION +{ + LINUX_2.6 { + global: + __kernel_vsyscall; + __kernel_sigreturn; + __kernel_rt_sigreturn; + + local: *; + }; +} diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig index b445d02075e..9dd606464d2 100644 --- a/arch/sh/mm/Kconfig +++ b/arch/sh/mm/Kconfig @@ -223,6 +223,19 @@ config 32BIT 32-bits through the SH-4A PMB. If this is not set, legacy 29-bit physical addressing will be used. +config VSYSCALL + bool "Support vsyscall page" + depends on MMU + default y + help + This will enable support for the kernel mapping a vDSO page + in process space, and subsequently handing down the entry point + to the libc through the ELF auxiliary vector. + + From the kernel side this is used for the signal trampoline. + For systems with an MMU that can afford to give up a page, + (the default value) say Y. + choice prompt "HugeTLB page size" depends on HUGETLB_PAGE && CPU_SH4 && MMU diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index ad182b31d84..7154d1ce978 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -286,6 +286,9 @@ void __init mem_init(void) initsize >> 10); p3_cache_init(); + + /* Initialize the vDSO */ + vsyscall_init(); } void free_initmem(void) diff --git a/arch/sh/mm/tlb-flush.c b/arch/sh/mm/tlb-flush.c index fd7e42bcaa4..73ec7f6084f 100644 --- a/arch/sh/mm/tlb-flush.c +++ b/arch/sh/mm/tlb-flush.c @@ -14,12 +14,12 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long page) { - if (vma->vm_mm && vma->vm_mm->context != NO_CONTEXT) { + if (vma->vm_mm && vma->vm_mm->context.id != NO_CONTEXT) { unsigned long flags; unsigned long asid; unsigned long saved_asid = MMU_NO_ASID; - asid = vma->vm_mm->context & MMU_CONTEXT_ASID_MASK; + asid = vma->vm_mm->context.id & MMU_CONTEXT_ASID_MASK; page &= PAGE_MASK; local_irq_save(flags); @@ -39,20 +39,21 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, { struct mm_struct *mm = vma->vm_mm; - if (mm->context != NO_CONTEXT) { + if (mm->context.id != NO_CONTEXT) { unsigned long flags; int size; local_irq_save(flags); size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT; if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */ - mm->context = NO_CONTEXT; + mm->context.id = NO_CONTEXT; if (mm == current->mm) activate_context(mm); } else { - unsigned long asid = mm->context&MMU_CONTEXT_ASID_MASK; + unsigned long asid; unsigned long saved_asid = MMU_NO_ASID; + asid = mm->context.id & MMU_CONTEXT_ASID_MASK; start &= PAGE_MASK; end += (PAGE_SIZE - 1); end &= PAGE_MASK; @@ -81,9 +82,10 @@ void flush_tlb_kernel_range(unsigned long start, unsigned long end) if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */ flush_tlb_all(); } else { - unsigned long asid = init_mm.context&MMU_CONTEXT_ASID_MASK; + unsigned long asid; unsigned long saved_asid = get_asid(); + asid = init_mm.context.id & MMU_CONTEXT_ASID_MASK; start &= PAGE_MASK; end += (PAGE_SIZE - 1); end &= PAGE_MASK; @@ -101,11 +103,11 @@ void flush_tlb_mm(struct mm_struct *mm) { /* Invalidate all TLB of this process. */ /* Instead of invalidating each TLB, we get new MMU context. */ - if (mm->context != NO_CONTEXT) { + if (mm->context.id != NO_CONTEXT) { unsigned long flags; local_irq_save(flags); - mm->context = NO_CONTEXT; + mm->context.id = NO_CONTEXT; if (mm == current->mm) activate_context(mm); local_irq_restore(flags); |