diff options
Diffstat (limited to 'arch/um')
49 files changed, 985 insertions, 345 deletions
diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 5982fe2753e0..05fbb20636cb 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -22,6 +22,9 @@ config SBUS config PCI bool +config PCMCIA + bool + config GENERIC_CALIBRATE_DELAY bool default y diff --git a/arch/um/Makefile b/arch/um/Makefile index 8d14c7a831be..24790bed2054 100644 --- a/arch/um/Makefile +++ b/arch/um/Makefile @@ -20,7 +20,7 @@ core-y += $(ARCH_DIR)/kernel/ \ # Have to precede the include because the included Makefiles reference them. SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \ - module.h vm-flags.h elf.h ldt.h + module.h vm-flags.h elf.h host_ldt.h SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header)) # XXX: The "os" symlink is only used by arch/um/include/os.h, which includes @@ -129,7 +129,7 @@ CPPFLAGS_vmlinux.lds = -U$(SUBARCH) \ -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \ -DELF_FORMAT="$(ELF_FORMAT)" $(CPP_MODE-y) \ -DKERNEL_STACK_SIZE=$(STACK_SIZE) \ - -DUNMAP_PATH=arch/um/sys-$(SUBARCH)/unmap_fin.o + -DUNMAP_PATH=arch/um/sys-$(SUBARCH)/unmap.o #The wrappers will select whether using "malloc" or the kernel allocator. LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc @@ -150,8 +150,7 @@ CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/uml-config.h \ $(ARCH_DIR)/include/user_constants.h \ $(ARCH_DIR)/include/kern_constants.h $(ARCH_DIR)/Kconfig.arch -MRPROPER_FILES += $(SYMLINK_HEADERS) $(ARCH_SYMLINKS) \ - $(addprefix $(ARCH_DIR)/kernel/,$(KERN_SYMLINKS)) $(ARCH_DIR)/os +MRPROPER_FILES += $(ARCH_SYMLINKS) archclean: @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \ diff --git a/arch/um/Makefile-x86_64 b/arch/um/Makefile-x86_64 index 38df311e75dc..dfd88b652fbe 100644 --- a/arch/um/Makefile-x86_64 +++ b/arch/um/Makefile-x86_64 @@ -1,7 +1,7 @@ # Copyright 2003 - 2004 Pathscale, Inc # Released under the GPL -libs-y += arch/um/sys-x86_64/ +core-y += arch/um/sys-x86_64/ START := 0x60000000 #We #undef __x86_64__ for kernelspace, not for userspace where diff --git a/arch/um/drivers/daemon_kern.c b/arch/um/drivers/daemon_kern.c index a61b7b46bc02..53d09ed78b42 100644 --- a/arch/um/drivers/daemon_kern.c +++ b/arch/um/drivers/daemon_kern.c @@ -95,18 +95,7 @@ static struct transport daemon_transport = { static int register_daemon(void) { register_transport(&daemon_transport); - return(1); + return 0; } __initcall(register_daemon); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c index 49acb2badf32..d18a974735e6 100644 --- a/arch/um/drivers/harddog_kern.c +++ b/arch/um/drivers/harddog_kern.c @@ -104,7 +104,7 @@ static int harddog_release(struct inode *inode, struct file *file) extern int ping_watchdog(int fd); -static ssize_t harddog_write(struct file *file, const char *data, size_t len, +static ssize_t harddog_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { /* @@ -118,6 +118,7 @@ static ssize_t harddog_write(struct file *file, const char *data, size_t len, static int harddog_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { + void __user *argp= (void __user *)arg; static struct watchdog_info ident = { WDIOC_SETTIMEOUT, 0, @@ -127,13 +128,12 @@ static int harddog_ioctl(struct inode *inode, struct file *file, default: return -ENOTTY; case WDIOC_GETSUPPORT: - if(copy_to_user((struct harddog_info *)arg, &ident, - sizeof(ident))) + if(copy_to_user(argp, &ident, sizeof(ident))) return -EFAULT; return 0; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: - return put_user(0,(int *)arg); + return put_user(0,(int __user *)argp); case WDIOC_KEEPALIVE: return(ping_watchdog(harddog_out_fd)); } diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c index 59602b81b240..37232f908cd7 100644 --- a/arch/um/drivers/hostaudio_kern.c +++ b/arch/um/drivers/hostaudio_kern.c @@ -67,8 +67,8 @@ MODULE_PARM_DESC(mixer, MIXER_HELP); /* /dev/dsp file operations */ -static ssize_t hostaudio_read(struct file *file, char *buffer, size_t count, - loff_t *ppos) +static ssize_t hostaudio_read(struct file *file, char __user *buffer, + size_t count, loff_t *ppos) { struct hostaudio_state *state = file->private_data; void *kbuf; @@ -94,7 +94,7 @@ static ssize_t hostaudio_read(struct file *file, char *buffer, size_t count, return(err); } -static ssize_t hostaudio_write(struct file *file, const char *buffer, +static ssize_t hostaudio_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { struct hostaudio_state *state = file->private_data; @@ -152,7 +152,7 @@ static int hostaudio_ioctl(struct inode *inode, struct file *file, case SNDCTL_DSP_CHANNELS: case SNDCTL_DSP_SUBDIVIDE: case SNDCTL_DSP_SETFRAGMENT: - if(get_user(data, (int *) arg)) + if(get_user(data, (int __user *) arg)) return(-EFAULT); break; default: @@ -168,7 +168,7 @@ static int hostaudio_ioctl(struct inode *inode, struct file *file, case SNDCTL_DSP_CHANNELS: case SNDCTL_DSP_SUBDIVIDE: case SNDCTL_DSP_SETFRAGMENT: - if(put_user(data, (int *) arg)) + if(put_user(data, (int __user *) arg)) return(-EFAULT); break; default: diff --git a/arch/um/drivers/mcast_kern.c b/arch/um/drivers/mcast_kern.c index c9b078fba03e..3a7af18cf944 100644 --- a/arch/um/drivers/mcast_kern.c +++ b/arch/um/drivers/mcast_kern.c @@ -124,18 +124,7 @@ static struct transport mcast_transport = { static int register_mcast(void) { register_transport(&mcast_transport); - return(1); + return 0; } __initcall(register_mcast); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c index 1488816588ea..28e3760e8b98 100644 --- a/arch/um/drivers/mconsole_kern.c +++ b/arch/um/drivers/mconsole_kern.c @@ -20,6 +20,8 @@ #include "linux/namei.h" #include "linux/proc_fs.h" #include "linux/syscalls.h" +#include "linux/list.h" +#include "linux/mm.h" #include "linux/console.h" #include "asm/irq.h" #include "asm/uaccess.h" @@ -347,6 +349,142 @@ static struct mc_device *mconsole_find_dev(char *name) return(NULL); } +#define UNPLUGGED_PER_PAGE \ + ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) + +struct unplugged_pages { + struct list_head list; + void *pages[UNPLUGGED_PER_PAGE]; +}; + +static unsigned long long unplugged_pages_count = 0; +static struct list_head unplugged_pages = LIST_HEAD_INIT(unplugged_pages); +static int unplug_index = UNPLUGGED_PER_PAGE; + +static int mem_config(char *str) +{ + unsigned long long diff; + int err = -EINVAL, i, add; + char *ret; + + if(str[0] != '=') + goto out; + + str++; + if(str[0] == '-') + add = 0; + else if(str[0] == '+'){ + add = 1; + } + else goto out; + + str++; + diff = memparse(str, &ret); + if(*ret != '\0') + goto out; + + diff /= PAGE_SIZE; + + for(i = 0; i < diff; i++){ + struct unplugged_pages *unplugged; + void *addr; + + if(add){ + if(list_empty(&unplugged_pages)) + break; + + unplugged = list_entry(unplugged_pages.next, + struct unplugged_pages, list); + if(unplug_index > 0) + addr = unplugged->pages[--unplug_index]; + else { + list_del(&unplugged->list); + addr = unplugged; + unplug_index = UNPLUGGED_PER_PAGE; + } + + free_page((unsigned long) addr); + unplugged_pages_count--; + } + else { + struct page *page; + + page = alloc_page(GFP_ATOMIC); + if(page == NULL) + break; + + unplugged = page_address(page); + if(unplug_index == UNPLUGGED_PER_PAGE){ + INIT_LIST_HEAD(&unplugged->list); + list_add(&unplugged->list, &unplugged_pages); + unplug_index = 0; + } + else { + struct list_head *entry = unplugged_pages.next; + addr = unplugged; + + unplugged = list_entry(entry, + struct unplugged_pages, + list); + unplugged->pages[unplug_index++] = addr; + err = os_drop_memory(addr, PAGE_SIZE); + if(err) + printk("Failed to release memory - " + "errno = %d\n", err); + } + + unplugged_pages_count++; + } + } + + err = 0; +out: + return err; +} + +static int mem_get_config(char *name, char *str, int size, char **error_out) +{ + char buf[sizeof("18446744073709551615")]; + int len = 0; + + sprintf(buf, "%ld", uml_physmem); + CONFIG_CHUNK(str, size, len, buf, 1); + + return len; +} + +static int mem_id(char **str, int *start_out, int *end_out) +{ + *start_out = 0; + *end_out = 0; + + return 0; +} + +static int mem_remove(int n) +{ + return -EBUSY; +} + +static struct mc_device mem_mc = { + .name = "mem", + .config = mem_config, + .get_config = mem_get_config, + .id = mem_id, + .remove = mem_remove, +}; + +static int mem_mc_init(void) +{ + if(can_drop_memory()) + mconsole_register_dev(&mem_mc); + else printk("Can't release memory to the host - memory hotplug won't " + "be supported\n"); + return 0; +} + +__initcall(mem_mc_init); + #define CONFIG_BUF_SIZE 64 static void mconsole_get_config(int (*get_config)(char *, char *, int, @@ -478,7 +616,7 @@ static void console_write(struct console *console, const char *string, return; while(1){ - n = min(len, ARRAY_SIZE(console_buf) - console_index); + n = min((size_t)len, ARRAY_SIZE(console_buf) - console_index); strncpy(&console_buf[console_index], string, n); console_index += n; string += n; diff --git a/arch/um/drivers/pcap_kern.c b/arch/um/drivers/pcap_kern.c index 07c80f2156ef..466ff2c2f918 100644 --- a/arch/um/drivers/pcap_kern.c +++ b/arch/um/drivers/pcap_kern.c @@ -106,18 +106,7 @@ static struct transport pcap_transport = { static int register_pcap(void) { register_transport(&pcap_transport); - return(1); + return 0; } __initcall(register_pcap); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/drivers/slip_kern.c b/arch/um/drivers/slip_kern.c index a62f5ef445cf..163ee0d5f75e 100644 --- a/arch/um/drivers/slip_kern.c +++ b/arch/um/drivers/slip_kern.c @@ -93,18 +93,7 @@ static struct transport slip_transport = { static int register_slip(void) { register_transport(&slip_transport); - return(1); + return 0; } __initcall(register_slip); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/drivers/slirp_kern.c b/arch/um/drivers/slirp_kern.c index 33d7982be5d3..95e50c943e14 100644 --- a/arch/um/drivers/slirp_kern.c +++ b/arch/um/drivers/slirp_kern.c @@ -77,7 +77,7 @@ static int slirp_setup(char *str, char **mac_out, void *data) int i=0; *init = ((struct slirp_init) - { argw : { { "slirp", NULL } } }); + { .argw = { { "slirp", NULL } } }); str = split_if_spec(str, mac_out, NULL); @@ -116,18 +116,7 @@ static struct transport slirp_transport = { static int register_slirp(void) { register_transport(&slirp_transport); - return(1); + return 0; } __initcall(register_slirp); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index 0336575d2448..0897852b09a3 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -891,7 +891,7 @@ int ubd_driver_init(void){ SA_INTERRUPT, "ubd", ubd_dev); if(err != 0) printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err); - return(err); + return 0; } device_initcall(ubd_driver_init); diff --git a/arch/um/include/kern_util.h b/arch/um/include/kern_util.h index 07176d92e1c9..42557130a408 100644 --- a/arch/um/include/kern_util.h +++ b/arch/um/include/kern_util.h @@ -116,7 +116,11 @@ extern void *get_current(void); extern struct task_struct *get_task(int pid, int require); extern void machine_halt(void); extern int is_syscall(unsigned long addr); -extern void arch_switch(void); + +extern void arch_switch_to_tt(struct task_struct *from, struct task_struct *to); + +extern void arch_switch_to_skas(struct task_struct *from, struct task_struct *to); + extern void free_irq(unsigned int, void *); extern int cpu(void); diff --git a/arch/um/include/line.h b/arch/um/include/line.h index 6f4d680dc1d4..6ac0f8252e21 100644 --- a/arch/um/include/line.h +++ b/arch/um/include/line.h @@ -58,23 +58,17 @@ struct line { }; #define LINE_INIT(str, d) \ - { init_str : str, \ - init_pri : INIT_STATIC, \ - valid : 1, \ - throttled : 0, \ - lock : SPIN_LOCK_UNLOCKED, \ - buffer : NULL, \ - head : NULL, \ - tail : NULL, \ - sigio : 0, \ - driver : d, \ - have_irq : 0 } + { .init_str = str, \ + .init_pri = INIT_STATIC, \ + .valid = 1, \ + .lock = SPIN_LOCK_UNLOCKED, \ + .driver = d } struct lines { int num; }; -#define LINES_INIT(n) { num : n } +#define LINES_INIT(n) { .num = n } extern void line_close(struct tty_struct *tty, struct file * filp); extern int line_open(struct line *lines, struct tty_struct *tty); diff --git a/arch/um/include/mem_user.h b/arch/um/include/mem_user.h index a1064c5823bf..a54514d2cc3a 100644 --- a/arch/um/include/mem_user.h +++ b/arch/um/include/mem_user.h @@ -49,7 +49,6 @@ extern int iomem_size; extern unsigned long host_task_size; extern unsigned long task_size; -extern void check_devanon(void); extern int init_mem_user(void); extern void setup_memory(void *entry); extern unsigned long find_iomem(char *driver, unsigned long *len_out); diff --git a/arch/um/include/os.h b/arch/um/include/os.h index d3d1bc6074ef..f88856c28a66 100644 --- a/arch/um/include/os.h +++ b/arch/um/include/os.h @@ -13,6 +13,7 @@ #include "kern_util.h" #include "skas/mm_id.h" #include "irq_user.h" +#include "sysdep/tls.h" #define OS_TYPE_FILE 1 #define OS_TYPE_DIR 2 @@ -172,6 +173,7 @@ extern int os_fchange_dir(int fd); extern void os_early_checks(void); extern int can_do_skas(void); extern void os_check_bugs(void); +extern void check_host_supports_tls(int *supports_tls, int *tls_min); /* Make sure they are clear when running in TT mode. Required by * SEGV_MAYBE_FIXABLE */ @@ -205,6 +207,8 @@ extern int os_map_memory(void *virt, int fd, unsigned long long off, extern int os_protect_memory(void *addr, unsigned long len, int r, int w, int x); extern int os_unmap_memory(void *addr, int len); +extern int os_drop_memory(void *addr, int length); +extern int can_drop_memory(void); extern void os_flush_stdout(void); /* tt.c @@ -234,8 +238,12 @@ extern int run_helper_thread(int (*proc)(void *), void *arg, int stack_order); extern int helper_wait(int pid); -/* umid.c */ +/* tls.c */ +extern int os_set_thread_area(user_desc_t *info, int pid); +extern int os_get_thread_area(user_desc_t *info, int pid); + +/* umid.c */ extern int umid_file_name(char *name, char *buf, int len); extern int set_umid(char *name); extern char *get_umid(void); diff --git a/arch/um/include/sysdep-i386/checksum.h b/arch/um/include/sysdep-i386/checksum.h index 7d3d202d7fff..052bb061a978 100644 --- a/arch/um/include/sysdep-i386/checksum.h +++ b/arch/um/include/sysdep-i386/checksum.h @@ -48,7 +48,8 @@ unsigned int csum_partial_copy_nocheck(const unsigned char *src, unsigned char * */ static __inline__ -unsigned int csum_partial_copy_from_user(const unsigned char *src, unsigned char *dst, +unsigned int csum_partial_copy_from_user(const unsigned char __user *src, + unsigned char *dst, int len, int sum, int *err_ptr) { if(copy_from_user(dst, src, len)){ @@ -192,7 +193,7 @@ static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr, */ #define HAVE_CSUM_COPY_USER static __inline__ unsigned int csum_and_copy_to_user(const unsigned char *src, - unsigned char *dst, + unsigned char __user *dst, int len, int sum, int *err_ptr) { if (access_ok(VERIFY_WRITE, dst, len)){ diff --git a/arch/um/include/sysdep-i386/ptrace.h b/arch/um/include/sysdep-i386/ptrace.h index c8ee9559f3ab..6670cc992ecb 100644 --- a/arch/um/include/sysdep-i386/ptrace.h +++ b/arch/um/include/sysdep-i386/ptrace.h @@ -14,7 +14,12 @@ #define MAX_REG_NR (UM_FRAME_SIZE / sizeof(unsigned long)) #define MAX_REG_OFFSET (UM_FRAME_SIZE) +#ifdef UML_CONFIG_PT_PROXY extern void update_debugregs(int seq); +#else +static inline void update_debugregs(int seq) {} +#endif + /* syscall emulation path in ptrace */ diff --git a/arch/um/include/sysdep-i386/tls.h b/arch/um/include/sysdep-i386/tls.h new file mode 100644 index 000000000000..918fd3c5ff9c --- /dev/null +++ b/arch/um/include/sysdep-i386/tls.h @@ -0,0 +1,32 @@ +#ifndef _SYSDEP_TLS_H +#define _SYSDEP_TLS_H + +# ifndef __KERNEL__ + +/* Change name to avoid conflicts with the original one from <asm/ldt.h>, which + * may be named user_desc (but in 2.4 and in header matching its API was named + * modify_ldt_ldt_s). */ + +typedef struct um_dup_user_desc { + unsigned int entry_number; + unsigned int base_addr; + unsigned int limit; + unsigned int seg_32bit:1; + unsigned int contents:2; + unsigned int read_exec_only:1; + unsigned int limit_in_pages:1; + unsigned int seg_not_present:1; + unsigned int useable:1; +} user_desc_t; + +# else /* __KERNEL__ */ + +# include <asm/ldt.h> +typedef struct user_desc user_desc_t; + +# endif /* __KERNEL__ */ + +#define GDT_ENTRY_TLS_MIN_I386 6 +#define GDT_ENTRY_TLS_MIN_X86_64 12 + +#endif /* _SYSDEP_TLS_H */ diff --git a/arch/um/include/sysdep-x86_64/tls.h b/arch/um/include/sysdep-x86_64/tls.h new file mode 100644 index 000000000000..35f19f25bd3b --- /dev/null +++ b/arch/um/include/sysdep-x86_64/tls.h @@ -0,0 +1,29 @@ +#ifndef _SYSDEP_TLS_H +#define _SYSDEP_TLS_H + +# ifndef __KERNEL__ + +/* Change name to avoid conflicts with the original one from <asm/ldt.h>, which + * may be named user_desc (but in 2.4 and in header matching its API was named + * modify_ldt_ldt_s). */ + +typedef struct um_dup_user_desc { + unsigned int entry_number; + unsigned int base_addr; + unsigned int limit; + unsigned int seg_32bit:1; + unsigned int contents:2; + unsigned int read_exec_only:1; + unsigned int limit_in_pages:1; + unsigned int seg_not_present:1; + unsigned int useable:1; + unsigned int lm:1; +} user_desc_t; + +# else /* __KERNEL__ */ + +# include <asm/ldt.h> +typedef struct user_desc user_desc_t; + +# endif /* __KERNEL__ */ +#endif /* _SYSDEP_TLS_H */ diff --git a/arch/um/include/user_util.h b/arch/um/include/user_util.h index 992a7e1e0fca..fe0c29b5144d 100644 --- a/arch/um/include/user_util.h +++ b/arch/um/include/user_util.h @@ -8,6 +8,9 @@ #include "sysdep/ptrace.h" +/* Copied from kernel.h */ +#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) + #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR)) extern int mode_tt; @@ -31,7 +34,7 @@ extern unsigned long uml_physmem; extern unsigned long uml_reserved; extern unsigned long end_vm; extern unsigned long start_vm; -extern unsigned long highmem; +extern unsigned long long highmem; extern char host_info[]; diff --git a/arch/um/kernel/exec_kern.c b/arch/um/kernel/exec_kern.c index 1ca84319317d..c0cb627bf594 100644 --- a/arch/um/kernel/exec_kern.c +++ b/arch/um/kernel/exec_kern.c @@ -22,6 +22,7 @@ void flush_thread(void) { + arch_flush_thread(¤t->thread.arch); CHOOSE_MODE(flush_thread_tt(), flush_thread_skas()); } @@ -58,14 +59,14 @@ long um_execve(char *file, char __user *__user *argv, char __user *__user *env) return(err); } -long sys_execve(char *file, char __user *__user *argv, +long sys_execve(char __user *file, char __user *__user *argv, char __user *__user *env) { long error; char *filename; lock_kernel(); - filename = getname((char __user *) file); + filename = getname(file); error = PTR_ERR(filename); if (IS_ERR(filename)) goto out; error = execve1(filename, argv, env); @@ -74,14 +75,3 @@ long sys_execve(char *file, char __user *__user *argv, unlock_kernel(); return(error); } - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 92cce96b5e24..44e41a35f000 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -30,7 +30,7 @@ extern char __binary_start; unsigned long *empty_zero_page = NULL; unsigned long *empty_bad_page = NULL; pgd_t swapper_pg_dir[PTRS_PER_PGD]; -unsigned long highmem; +unsigned long long highmem; int kmalloc_ok = 0; static unsigned long brk_end; diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c index 3113cab8675e..f6a5a502120b 100644 --- a/arch/um/kernel/process_kern.c +++ b/arch/um/kernel/process_kern.c @@ -156,9 +156,25 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, unsigned long stack_top, struct task_struct * p, struct pt_regs *regs) { + int ret; + p->thread = (struct thread_struct) INIT_THREAD; - return(CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr, - clone_flags, sp, stack_top, p, regs)); + ret = CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr, + clone_flags, sp, stack_top, p, regs); + + if (ret || !current->thread.forking) + goto out; + + clear_flushed_tls(p); + + /* + * Set a new TLS for the child thread? + */ + if (clone_flags & CLONE_SETTLS) + ret = arch_copy_tls(p); + +out: + return ret; } void initial_thread_cb(void (*proc)(void *), void *arg) @@ -185,10 +201,6 @@ void default_idle(void) { CHOOSE_MODE(uml_idle_timer(), (void) 0); - atomic_inc(&init_mm.mm_count); - current->mm = &init_mm; - current->active_mm = &init_mm; - while(1){ /* endless idle loop with no priority at all */ @@ -407,7 +419,7 @@ static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int return strlen(buf); } -static int proc_write_sysemu(struct file *file,const char *buf, unsigned long count,void *data) +static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data) { char tmp[2]; diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c index 98e09395c093..60d2eda995c1 100644 --- a/arch/um/kernel/ptrace.c +++ b/arch/um/kernel/ptrace.c @@ -46,6 +46,7 @@ extern int poke_user(struct task_struct * child, long addr, long data); long arch_ptrace(struct task_struct *child, long request, long addr, long data) { int i, ret; + unsigned long __user *p = (void __user *)(unsigned long)data; switch (request) { /* when I and D space are separate, these will need to be fixed. */ @@ -58,7 +59,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); if (copied != sizeof(tmp)) break; - ret = put_user(tmp, (unsigned long __user *) data); + ret = put_user(tmp, p); break; } @@ -136,15 +137,13 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) #ifdef PTRACE_GETREGS case PTRACE_GETREGS: { /* Get all gp regs from the child. */ - if (!access_ok(VERIFY_WRITE, (unsigned long *)data, - MAX_REG_OFFSET)) { + if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) { ret = -EIO; break; } for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) { - __put_user(getreg(child, i), - (unsigned long __user *) data); - data += sizeof(long); + __put_user(getreg(child, i), p); + p++; } ret = 0; break; @@ -153,15 +152,14 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) #ifdef PTRACE_SETREGS case PTRACE_SETREGS: { /* Set all gp regs in the child. */ unsigned long tmp = 0; - if (!access_ok(VERIFY_READ, (unsigned *)data, - MAX_REG_OFFSET)) { + if (!access_ok(VERIFY_READ, p, MAX_REG_OFFSET)) { ret = -EIO; break; } for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) { - __get_user(tmp, (unsigned long __user *) data); + __get_user(tmp, p); putreg(child, i, tmp); - data += sizeof(long); + p++; } ret = 0; break; @@ -187,14 +185,23 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) ret = set_fpxregs(data, child); break; #endif + case PTRACE_GET_THREAD_AREA: + ret = ptrace_get_thread_area(child, addr, + (struct user_desc __user *) data); + break; + + case PTRACE_SET_THREAD_AREA: + ret = ptrace_set_thread_area(child, addr, + (struct user_desc __user *) data); + break; + case PTRACE_FAULTINFO: { - /* Take the info from thread->arch->faultinfo, - * but transfer max. sizeof(struct ptrace_faultinfo). - * On i386, ptrace_faultinfo is smaller! - */ - ret = copy_to_user((unsigned long __user *) data, - &child->thread.arch.faultinfo, - sizeof(struct ptrace_faultinfo)); + /* Take the info from thread->arch->faultinfo, + * but transfer max. sizeof(struct ptrace_faultinfo). + * On i386, ptrace_faultinfo is smaller! + */ + ret = copy_to_user(p, &child->thread.arch.faultinfo, + sizeof(struct ptrace_faultinfo)); if(ret) break; break; @@ -204,8 +211,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) case PTRACE_LDT: { struct ptrace_ldt ldt; - if(copy_from_user(&ldt, (unsigned long __user *) data, - sizeof(ldt))){ + if(copy_from_user(&ldt, p, sizeof(ldt))){ ret = -EIO; break; } diff --git a/arch/um/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c index 3f70a2e12f06..2135eaf98a93 100644 --- a/arch/um/kernel/skas/process_kern.c +++ b/arch/um/kernel/skas/process_kern.c @@ -35,6 +35,8 @@ void switch_to_skas(void *prev, void *next) switch_threads(&from->thread.mode.skas.switch_buf, to->thread.mode.skas.switch_buf); + arch_switch_to_skas(current->thread.prev_sched, current); + if(current->pid == 0) switch_timers(1); } @@ -89,10 +91,17 @@ void fork_handler(int sig) panic("blech"); schedule_tail(current->thread.prev_sched); + + /* XXX: if interrupt_end() calls schedule, this call to + * arch_switch_to_skas isn't needed. We could want to apply this to + * improve performance. -bb */ + arch_switch_to_skas(current->thread.prev_sched, current); + current->thread.prev_sched = NULL; /* Handle any immediate reschedules or signals */ interrupt_end(); + userspace(¤t->thread.regs.regs); } @@ -109,6 +118,8 @@ int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp, if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp; handler = fork_handler; + + arch_copy_thread(¤t->thread.arch, &p->thread.arch); } else { init_thread_registers(&p->thread.regs.regs); diff --git a/arch/um/kernel/syscall_kern.c b/arch/um/kernel/syscall_kern.c index 8e1a3501ff46..37d3978337d8 100644 --- a/arch/um/kernel/syscall_kern.c +++ b/arch/um/kernel/syscall_kern.c @@ -104,7 +104,7 @@ long sys_pipe(unsigned long __user * fildes) } -long sys_uname(struct old_utsname * name) +long sys_uname(struct old_utsname __user * name) { long err; if (!name) @@ -115,7 +115,7 @@ long sys_uname(struct old_utsname * name) return err?-EFAULT:0; } -long sys_olduname(struct oldold_utsname * name) +long sys_olduname(struct oldold_utsname __user * name) { long error; diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c index d56046c2aba2..02f6d4d8dc3a 100644 --- a/arch/um/kernel/trap_kern.c +++ b/arch/um/kernel/trap_kern.c @@ -198,7 +198,7 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user, void *sc) si.si_signo = SIGBUS; si.si_errno = 0; si.si_code = BUS_ADRERR; - si.si_addr = (void *)address; + si.si_addr = (void __user *)address; current->thread.arch.faultinfo = fi; force_sig_info(SIGBUS, &si, current); } else if (err == -ENOMEM) { @@ -207,7 +207,7 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user, void *sc) } else { BUG_ON(err != -EFAULT); si.si_signo = SIGSEGV; - si.si_addr = (void *) address; + si.si_addr = (void __user *) address; current->thread.arch.faultinfo = fi; force_sig_info(SIGSEGV, &si, current); } @@ -220,8 +220,8 @@ void bad_segv(struct faultinfo fi, unsigned long ip) si.si_signo = SIGSEGV; si.si_code = SEGV_ACCERR; - si.si_addr = (void *) FAULT_ADDRESS(fi); - current->thread.arch.faultinfo = fi; + si.si_addr = (void __user *) FAULT_ADDRESS(fi); + current->thread.arch.faultinfo = fi; force_sig_info(SIGSEGV, &si, current); } diff --git a/arch/um/kernel/tt/process_kern.c b/arch/um/kernel/tt/process_kern.c index 295c1ac817b3..a9c1443fc548 100644 --- a/arch/um/kernel/tt/process_kern.c +++ b/arch/um/kernel/tt/process_kern.c @@ -51,6 +51,13 @@ void switch_to_tt(void *prev, void *next) c = 0; + /* Notice that here we "up" the semaphore on which "to" is waiting, and + * below (the read) we wait on this semaphore (which is implemented by + * switch_pipe) and go sleeping. Thus, after that, we have resumed in + * "to", and can't use any more the value of "from" (which is outdated), + * nor the value in "to" (since it was the task which stole us the CPU, + * which we don't care about). */ + err = os_write_file(to->thread.mode.tt.switch_pipe[1], &c, sizeof(c)); if(err != sizeof(c)) panic("write of switch_pipe failed, err = %d", -err); @@ -77,7 +84,7 @@ void switch_to_tt(void *prev, void *next) change_sig(SIGALRM, alrm); change_sig(SIGPROF, prof); - arch_switch(); + arch_switch_to_tt(prev_sched, current); flush_tlb_all(); local_irq_restore(flags); @@ -141,7 +148,6 @@ static void new_thread_handler(int sig) set_cmdline("(kernel thread)"); change_sig(SIGUSR1, 1); - change_sig(SIGVTALRM, 1); change_sig(SIGPROF, 1); local_irq_enable(); if(!run_kernel_thread(fn, arg, ¤t->thread.exec_buf)) diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile index 1659386b42bb..f4bfc4c7ccac 100644 --- a/arch/um/os-Linux/Makefile +++ b/arch/um/os-Linux/Makefile @@ -4,7 +4,7 @@ # obj-y = aio.o elf_aux.o file.o helper.o irq.o main.o mem.o process.o sigio.o \ - signal.o start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o \ + signal.o start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o tls.o \ user_syms.o util.o drivers/ sys-$(SUBARCH)/ obj-$(CONFIG_MODE_SKAS) += skas/ @@ -12,12 +12,9 @@ obj-$(CONFIG_TTY_LOG) += tty_log.o user-objs-$(CONFIG_TTY_LOG) += tty_log.o USER_OBJS := $(user-objs-y) aio.o elf_aux.o file.o helper.o irq.o main.o mem.o \ - process.o sigio.o signal.o start_up.o time.o trap.o tt.o tty.o \ + process.o sigio.o signal.o start_up.o time.o trap.o tt.o tty.o tls.o \ uaccess.o umid.o util.o -elf_aux.o: $(ARCH_DIR)/kernel-offsets.h -CFLAGS_elf_aux.o += -I$(objtree)/arch/um - CFLAGS_user_syms.o += -DSUBARCH_$(SUBARCH) HAVE_AIO_ABI := $(shell [ -r /usr/include/linux/aio_abi.h ] && \ diff --git a/arch/um/os-Linux/drivers/ethertap_kern.c b/arch/um/os-Linux/drivers/ethertap_kern.c index 6ae4b19d9f50..768606bec233 100644 --- a/arch/um/os-Linux/drivers/ethertap_kern.c +++ b/arch/um/os-Linux/drivers/ethertap_kern.c @@ -102,18 +102,7 @@ static struct transport ethertap_transport = { static int register_ethertap(void) { register_transport(ðertap_transport); - return(1); + return 0; } __initcall(register_ethertap); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/os-Linux/drivers/tuntap_kern.c b/arch/um/os-Linux/drivers/tuntap_kern.c index 4202b9ebad4c..190009a6f89c 100644 --- a/arch/um/os-Linux/drivers/tuntap_kern.c +++ b/arch/um/os-Linux/drivers/tuntap_kern.c @@ -87,18 +87,7 @@ static struct transport tuntap_transport = { static int register_tuntap(void) { register_transport(&tuntap_transport); - return(1); + return 0; } __initcall(register_tuntap); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c index 9d7d69a523bb..6ab372da9657 100644 --- a/arch/um/os-Linux/mem.c +++ b/arch/um/os-Linux/mem.c @@ -121,36 +121,11 @@ int create_tmp_file(unsigned long long len) return(fd); } -static int create_anon_file(unsigned long long len) -{ - void *addr; - int fd; - - fd = open("/dev/anon", O_RDWR); - if(fd < 0) { - perror("opening /dev/anon"); - exit(1); - } - - addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); - if(addr == MAP_FAILED){ - perror("mapping physmem file"); - exit(1); - } - munmap(addr, len); - - return(fd); -} - -extern int have_devanon; - int create_mem_file(unsigned long long len) { int err, fd; - if(have_devanon) - fd = create_anon_file(len); - else fd = create_tmp_file(len); + fd = create_tmp_file(len); err = os_set_exec_close(fd, 1); if(err < 0){ diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c index d261888f39c4..8176b0b52047 100644 --- a/arch/um/os-Linux/process.c +++ b/arch/um/os-Linux/process.c @@ -11,6 +11,7 @@ #include <linux/unistd.h> #include <sys/mman.h> #include <sys/wait.h> +#include <sys/mman.h> #include "ptrace_user.h" #include "os.h" #include "user.h" @@ -20,6 +21,7 @@ #include "kern_util.h" #include "longjmp.h" #include "skas_ptrace.h" +#include "kern_constants.h" #define ARBITRARY_ADDR -1 #define FAILURE_PID -1 @@ -187,6 +189,48 @@ int os_unmap_memory(void *addr, int len) return(0); } +#ifndef MADV_REMOVE +#define MADV_REMOVE 0x5 /* remove these pages & resources */ +#endif + +int os_drop_memory(void *addr, int length) +{ + int err; + + err = madvise(addr, length, MADV_REMOVE); + if(err < 0) + err = -errno; + return err; +} + +int can_drop_memory(void) +{ + void *addr; + int fd; + + printk("Checking host MADV_REMOVE support..."); + fd = create_mem_file(UM_KERN_PAGE_SIZE); + if(fd < 0){ + printk("Creating test memory file failed, err = %d\n", -fd); + return 0; + } + + addr = mmap64(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE, + MAP_PRIVATE, fd, 0); + if(addr == MAP_FAILED){ + printk("Mapping test memory file failed, err = %d\n", -errno); + return 0; + } + + if(madvise(addr, UM_KERN_PAGE_SIZE, MADV_REMOVE) != 0){ + printk("MADV_REMOVE failed, err = %d\n", -errno); + return 0; + } + + printk("OK\n"); + return 1; +} + void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int)) { int flags = 0, pages; diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c index 32753131f8d8..387e26af301a 100644 --- a/arch/um/os-Linux/start_up.c +++ b/arch/um/os-Linux/start_up.c @@ -470,25 +470,6 @@ int can_do_skas(void) } #endif -int have_devanon = 0; - -/* Runs on boot kernel stack - already safe to use printk. */ - -void check_devanon(void) -{ - int fd; - - printk("Checking for /dev/anon on the host..."); - fd = open("/dev/anon", O_RDWR); - if(fd < 0){ - printk("Not available (open failed with errno %d)\n", errno); - return; - } - - printk("OK\n"); - have_devanon = 1; -} - int __init parse_iomem(char *str, int *add) { struct iomem_region *new; @@ -664,6 +645,5 @@ void os_check_bugs(void) { check_ptrace(); check_sigio(); - check_devanon(); } diff --git a/arch/um/os-Linux/sys-i386/Makefile b/arch/um/os-Linux/sys-i386/Makefile index 340ef26f5944..b3213613c41c 100644 --- a/arch/um/os-Linux/sys-i386/Makefile +++ b/arch/um/os-Linux/sys-i386/Makefile @@ -3,7 +3,7 @@ # Licensed under the GPL # -obj-$(CONFIG_MODE_SKAS) = registers.o +obj-$(CONFIG_MODE_SKAS) = registers.o tls.o USER_OBJS := $(obj-y) diff --git a/arch/um/os-Linux/sys-i386/tls.c b/arch/um/os-Linux/sys-i386/tls.c new file mode 100644 index 000000000000..ba21f0e04a2f --- /dev/null +++ b/arch/um/os-Linux/sys-i386/tls.c @@ -0,0 +1,33 @@ +#include <linux/unistd.h> +#include "sysdep/tls.h" +#include "user_util.h" + +static _syscall1(int, get_thread_area, user_desc_t *, u_info); + +/* Checks whether host supports TLS, and sets *tls_min according to the value + * valid on the host. + * i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */ +void check_host_supports_tls(int *supports_tls, int *tls_min) { + /* Values for x86 and x86_64.*/ + int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64}; + int i; + + for (i = 0; i < ARRAY_SIZE(val); i++) { + user_desc_t info; + info.entry_number = val[i]; + + if (get_thread_area(&info) == 0) { + *tls_min = val[i]; + *supports_tls = 1; + return; + } else { + if (errno == EINVAL) + continue; + else if (errno == ENOSYS) + *supports_tls = 0; + return; + } + } + + *supports_tls = 0; +} diff --git a/arch/um/os-Linux/tls.c b/arch/um/os-Linux/tls.c new file mode 100644 index 000000000000..9cb09a45546b --- /dev/null +++ b/arch/um/os-Linux/tls.c @@ -0,0 +1,76 @@ +#include <errno.h> +#include <sys/ptrace.h> +#include <asm/ldt.h> +#include "sysdep/tls.h" +#include "uml-config.h" + +/* TLS support - we basically rely on the host's one.*/ + +/* In TT mode, this should be called only by the tracing thread, and makes sense + * only for PTRACE_SET_THREAD_AREA. In SKAS mode, it's used normally. + * + */ + +#ifndef PTRACE_GET_THREAD_AREA +#define PTRACE_GET_THREAD_AREA 25 +#endif + +#ifndef PTRACE_SET_THREAD_AREA +#define PTRACE_SET_THREAD_AREA 26 +#endif + +int os_set_thread_area(user_desc_t *info, int pid) +{ + int ret; + + ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number, + (unsigned long) info); + if (ret < 0) + ret = -errno; + return ret; +} + +#ifdef UML_CONFIG_MODE_SKAS + +int os_get_thread_area(user_desc_t *info, int pid) +{ + int ret; + + ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number, + (unsigned long) info); + if (ret < 0) + ret = -errno; + return ret; +} + +#endif + +#ifdef UML_CONFIG_MODE_TT +#include "linux/unistd.h" + +static _syscall1(int, get_thread_area, user_desc_t *, u_info); +static _syscall1(int, set_thread_area, user_desc_t *, u_info); + +int do_set_thread_area_tt(user_desc_t *info) +{ + int ret; + + ret = set_thread_area(info); + if (ret < 0) { + ret = -errno; + } + return ret; +} + +int do_get_thread_area_tt(user_desc_t *info) +{ + int ret; + + ret = get_thread_area(info); + if (ret < 0) { + ret = -errno; + } + return ret; +} + +#endif /* UML_CONFIG_MODE_TT */ diff --git a/arch/um/scripts/Makefile.rules b/arch/um/scripts/Makefile.rules index 2e41cabd3d93..b696b451774c 100644 --- a/arch/um/scripts/Makefile.rules +++ b/arch/um/scripts/Makefile.rules @@ -20,25 +20,7 @@ define unprofile $(patsubst -pg,,$(patsubst -fprofile-arcs -ftest-coverage,,$(1))) endef - -# cmd_make_link checks to see if the $(foo-dir) variable starts with a /. If -# so, it's considered to be a path relative to $(srcdir) rather than -# $(srcdir)/arch/$(SUBARCH). This is because x86_64 wants to get ldt.c from -# arch/um/sys-i386 rather than arch/i386 like the other borrowed files. So, -# it sets $(ldt.c-dir) to /arch/um/sys-i386. -quiet_cmd_make_link = SYMLINK $@ -cmd_make_link = rm -f $@; ln -sf $(srctree)$(if $(filter-out /%,$($(notdir $@)-dir)),/arch/$(SUBARCH))/$($(notdir $@)-dir)/$(notdir $@) $@ - -# this needs to be before the foreach, because targets does not accept -# complete paths like $(obj)/$(f). To make sure this works, use a := assignment -# or we will get $(obj)/$(f) in the "targets" value. -# Also, this forces you to use the := syntax when assigning to targets. -# Otherwise the line below will cause an infinite loop (if you don't know why, -# just do it). - -targets := $(targets) $(SYMLINKS) - -SYMLINKS := $(foreach f,$(SYMLINKS),$(obj)/$(f)) - -$(SYMLINKS): FORCE - $(call if_changed,make_link) +ifdef subarch-obj-y +obj-y += subarch.o +subarch-y = $(addprefix ../../$(SUBARCH)/,$(subarch-obj-y)) +endif diff --git a/arch/um/scripts/Makefile.unmap b/arch/um/scripts/Makefile.unmap deleted file mode 100644 index b2165188d942..000000000000 --- a/arch/um/scripts/Makefile.unmap +++ /dev/null @@ -1,22 +0,0 @@ -clean-files += unmap_tmp.o unmap_fin.o unmap.o - -ifdef CONFIG_MODE_TT - -#Always build unmap_fin.o -extra-y += unmap_fin.o -#Do dependency tracking for unmap.o (it will be always built, but won't get the tracking unless we use this). -targets += unmap.o - -#XXX: partially copied from arch/um/scripts/Makefile.rules -$(obj)/unmap.o: _c_flags = $(call unprofile,$(CFLAGS)) - -quiet_cmd_wrapld = LD $@ -define cmd_wrapld - $(LD) $(LDFLAGS) -r -o $(obj)/unmap_tmp.o $< ; \ - $(OBJCOPY) $(UML_OBJCOPYFLAGS) $(obj)/unmap_tmp.o $@ -G switcheroo -endef - -$(obj)/unmap_fin.o : $(obj)/unmap.o FORCE - $(call if_changed,wrapld) - -endif diff --git a/arch/um/sys-i386/Makefile b/arch/um/sys-i386/Makefile index f5fd5b0156d0..98b20b7bba4f 100644 --- a/arch/um/sys-i386/Makefile +++ b/arch/um/sys-i386/Makefile @@ -1,23 +1,18 @@ -obj-y := bitops.o bugs.o checksum.o delay.o fault.o ksyms.o ldt.o ptrace.o \ - ptrace_user.o semaphore.o signal.o sigcontext.o syscalls.o sysrq.o \ - sys_call_table.o +obj-y = bugs.o checksum.o delay.o fault.o ksyms.o ldt.o ptrace.o \ + ptrace_user.o signal.o sigcontext.o syscalls.o sysrq.o \ + sys_call_table.o tls.o obj-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o -obj-$(CONFIG_HIGHMEM) += highmem.o -obj-$(CONFIG_MODULES) += module.o +subarch-obj-y = lib/bitops.o kernel/semaphore.o +subarch-obj-$(CONFIG_HIGHMEM) += mm/highmem.o +subarch-obj-$(CONFIG_MODULES) += kernel/module.o USER_OBJS := bugs.o ptrace_user.o sigcontext.o fault.o stub_segv.o -SYMLINKS = bitops.c semaphore.c highmem.c module.c - include arch/um/scripts/Makefile.rules -bitops.c-dir = lib -semaphore.c-dir = kernel -highmem.c-dir = mm -module.c-dir = kernel - -$(obj)/stub_segv.o : _c_flags = $(call unprofile,$(CFLAGS)) +extra-$(CONFIG_MODE_TT) += unmap.o -include arch/um/scripts/Makefile.unmap +$(obj)/stub_segv.o $(obj)/unmap.o: \ + _c_flags = $(call unprofile,$(CFLAGS)) diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c index 8032a105949a..6028bc7cc01b 100644 --- a/arch/um/sys-i386/ptrace.c +++ b/arch/um/sys-i386/ptrace.c @@ -15,9 +15,22 @@ #include "sysdep/sigcontext.h" #include "sysdep/sc.h" -void arch_switch(void) +void arch_switch_to_tt(struct task_struct *from, struct task_struct *to) { - update_debugregs(current->thread.arch.debugregs_seq); + update_debugregs(to->thread.arch.debugregs_seq); + arch_switch_tls_tt(from, to); +} + +void arch_switch_to_skas(struct task_struct *from, struct task_struct *to) +{ + int err = arch_switch_tls_skas(from, to); + if (!err) + return; + + if (err != -EINVAL) + printk(KERN_WARNING "arch_switch_tls_skas failed, errno %d, not EINVAL\n", -err); + else + printk(KERN_WARNING "arch_switch_tls_skas failed, errno = EINVAL\n"); } int is_syscall(unsigned long addr) @@ -124,22 +137,22 @@ unsigned long getreg(struct task_struct *child, int regno) int peek_user(struct task_struct *child, long addr, long data) { /* read the word at location addr in the USER area. */ - unsigned long tmp; + unsigned long tmp; - if ((addr & 3) || addr < 0) - return -EIO; + if ((addr & 3) || addr < 0) + return -EIO; - tmp = 0; /* Default return condition */ - if(addr < MAX_REG_OFFSET){ - tmp = getreg(child, addr); - } - else if((addr >= offsetof(struct user, u_debugreg[0])) && - (addr <= offsetof(struct user, u_debugreg[7]))){ - addr -= offsetof(struct user, u_debugreg[0]); - addr = addr >> 2; - tmp = child->thread.arch.debugregs[addr]; - } - return put_user(tmp, (unsigned long *) data); + tmp = 0; /* Default return condition */ + if(addr < MAX_REG_OFFSET){ + tmp = getreg(child, addr); + } + else if((addr >= offsetof(struct user, u_debugreg[0])) && + (addr <= offsetof(struct user, u_debugreg[7]))){ + addr -= offsetof(struct user, u_debugreg[0]); + addr = addr >> 2; + tmp = child->thread.arch.debugregs[addr]; + } + return put_user(tmp, (unsigned long __user *) data); } struct i387_fxsave_struct { diff --git a/arch/um/sys-i386/ptrace_user.c b/arch/um/sys-i386/ptrace_user.c index 7c376c95de50..9f3bd8ed78f5 100644 --- a/arch/um/sys-i386/ptrace_user.c +++ b/arch/um/sys-i386/ptrace_user.c @@ -14,6 +14,7 @@ #include "sysdep/thread.h" #include "user.h" #include "os.h" +#include "uml-config.h" int ptrace_getregs(long pid, unsigned long *regs_out) { @@ -43,6 +44,7 @@ int ptrace_setfpregs(long pid, unsigned long *regs) return 0; } +/* All the below stuff is of interest for TT mode only */ static void write_debugregs(int pid, unsigned long *regs) { struct user *dummy; @@ -75,7 +77,6 @@ static void read_debugregs(int pid, unsigned long *regs) /* Accessed only by the tracing thread */ static unsigned long kernel_debugregs[8] = { [ 0 ... 7 ] = 0 }; -static int debugregs_seq = 0; void arch_enter_kernel(void *task, int pid) { @@ -89,6 +90,11 @@ void arch_leave_kernel(void *task, int pid) write_debugregs(pid, TASK_DEBUGREGS(task)); } +#ifdef UML_CONFIG_PT_PROXY +/* Accessed only by the tracing thread */ +static int debugregs_seq; + +/* Only called by the ptrace proxy */ void ptrace_pokeuser(unsigned long addr, unsigned long data) { if((addr < offsetof(struct user, u_debugreg[0])) || @@ -109,6 +115,7 @@ static void update_debugregs_cb(void *arg) write_debugregs(pid, kernel_debugregs); } +/* Optimized out in its header when not defined */ void update_debugregs(int seq) { int me; @@ -118,6 +125,7 @@ void update_debugregs(int seq) me = os_getpid(); initial_thread_cb(update_debugregs_cb, &me); } +#endif /* * Overrides for Emacs so that we follow Linus's tabbing style. diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c index 33a40f5ef0d2..f5d0e1c37ea2 100644 --- a/arch/um/sys-i386/signal.c +++ b/arch/um/sys-i386/signal.c @@ -19,7 +19,7 @@ #include "skas.h" static int copy_sc_from_user_skas(struct pt_regs *regs, - struct sigcontext *from) + struct sigcontext __user *from) { struct sigcontext sc; unsigned long fpregs[HOST_FP_SIZE]; @@ -57,7 +57,7 @@ static int copy_sc_from_user_skas(struct pt_regs *regs, return(0); } -int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp, +int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate __user *to_fp, struct pt_regs *regs, unsigned long sp) { struct sigcontext sc; @@ -92,7 +92,7 @@ int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp, "errno = %d\n", err); return(1); } - to_fp = (to_fp ? to_fp : (struct _fpstate *) (to + 1)); + to_fp = (to_fp ? to_fp : (struct _fpstate __user *) (to + 1)); sc.fpstate = to_fp; if(err) @@ -113,10 +113,11 @@ int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp, * saved pointer is in the kernel, but the sigcontext is in userspace, so we * copy_to_user it. */ -int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext *from, +int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext __user *from, int fpsize) { - struct _fpstate *to_fp, *from_fp; + struct _fpstate *to_fp; + struct _fpstate __user *from_fp; unsigned long sigs; int err; @@ -131,13 +132,14 @@ int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext *from, return(err); } -int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate *fp, +int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate __user *fp, struct sigcontext *from, int fpsize, unsigned long sp) { - struct _fpstate *to_fp, *from_fp; + struct _fpstate __user *to_fp; + struct _fpstate *from_fp; int err; - to_fp = (fp ? fp : (struct _fpstate *) (to + 1)); + to_fp = (fp ? fp : (struct _fpstate __user *) (to + 1)); from_fp = from->fpstate; err = copy_to_user(to, from, sizeof(*to)); @@ -165,7 +167,7 @@ static int copy_sc_from_user(struct pt_regs *to, void __user *from) return(ret); } -static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp, +static int copy_sc_to_user(struct sigcontext *to, struct _fpstate __user *fp, struct pt_regs *from, unsigned long sp) { return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs), @@ -173,7 +175,7 @@ static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp, copy_sc_to_user_skas(to, fp, from, sp))); } -static int copy_ucontext_to_user(struct ucontext *uc, struct _fpstate *fp, +static int copy_ucontext_to_user(struct ucontext __user *uc, struct _fpstate __user *fp, sigset_t *set, unsigned long sp) { int err = 0; @@ -188,7 +190,7 @@ static int copy_ucontext_to_user(struct ucontext *uc, struct _fpstate *fp, struct sigframe { - char *pretcode; + char __user *pretcode; int sig; struct sigcontext sc; struct _fpstate fpstate; @@ -198,10 +200,10 @@ struct sigframe struct rt_sigframe { - char *pretcode; + char __user *pretcode; int sig; - struct siginfo *pinfo; - void *puc; + struct siginfo __user *pinfo; + void __user *puc; struct siginfo info; struct ucontext uc; struct _fpstate fpstate; @@ -213,16 +215,16 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig, sigset_t *mask) { struct sigframe __user *frame; - void *restorer; + void __user *restorer; unsigned long save_sp = PT_REGS_SP(regs); int err = 0; stack_top &= -8UL; - frame = (struct sigframe *) stack_top - 1; + frame = (struct sigframe __user *) stack_top - 1; if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) return 1; - restorer = (void *) frame->retcode; + restorer = frame->retcode; if(ka->sa.sa_flags & SA_RESTORER) restorer = ka->sa.sa_restorer; @@ -278,16 +280,16 @@ int setup_signal_stack_si(unsigned long stack_top, int sig, siginfo_t *info, sigset_t *mask) { struct rt_sigframe __user *frame; - void *restorer; + void __user *restorer; unsigned long save_sp = PT_REGS_SP(regs); int err = 0; stack_top &= -8UL; - frame = (struct rt_sigframe *) stack_top - 1; + frame = (struct rt_sigframe __user *) stack_top - 1; if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) return 1; - restorer = (void *) frame->retcode; + restorer = frame->retcode; if(ka->sa.sa_flags & SA_RESTORER) restorer = ka->sa.sa_restorer; @@ -333,7 +335,7 @@ err: long sys_sigreturn(struct pt_regs regs) { unsigned long sp = PT_REGS_SP(¤t->thread.regs); - struct sigframe __user *frame = (struct sigframe *)(sp - 8); + struct sigframe __user *frame = (struct sigframe __user *)(sp - 8); sigset_t set; struct sigcontext __user *sc = &frame->sc; unsigned long __user *oldmask = &sc->oldmask; @@ -365,8 +367,8 @@ long sys_sigreturn(struct pt_regs regs) long sys_rt_sigreturn(struct pt_regs regs) { - unsigned long __user sp = PT_REGS_SP(¤t->thread.regs); - struct rt_sigframe __user *frame = (struct rt_sigframe *) (sp - 4); + unsigned long sp = PT_REGS_SP(¤t->thread.regs); + struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (sp - 4); sigset_t set; struct ucontext __user *uc = &frame->uc; int sig_size = _NSIG_WORDS * sizeof(unsigned long); diff --git a/arch/um/sys-i386/sys_call_table.S b/arch/um/sys-i386/sys_call_table.S index ad75c27afe38..1ff61474b25c 100644 --- a/arch/um/sys-i386/sys_call_table.S +++ b/arch/um/sys-i386/sys_call_table.S @@ -6,8 +6,6 @@ #define sys_vm86old sys_ni_syscall #define sys_vm86 sys_ni_syscall -#define sys_set_thread_area sys_ni_syscall -#define sys_get_thread_area sys_ni_syscall #define sys_stime um_stime #define sys_time um_time diff --git a/arch/um/sys-i386/syscalls.c b/arch/um/sys-i386/syscalls.c index 83e9be820a86..749dd1bfe60f 100644 --- a/arch/um/sys-i386/syscalls.c +++ b/arch/um/sys-i386/syscalls.c @@ -61,21 +61,27 @@ long old_select(struct sel_arg_struct __user *arg) return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); } -/* The i386 version skips reading from %esi, the fourth argument. So we must do - * this, too. +/* + * The prototype on i386 is: + * + * int clone(int flags, void * child_stack, int * parent_tidptr, struct user_desc * newtls, int * child_tidptr) + * + * and the "newtls" arg. on i386 is read by copy_thread directly from the + * register saved on the stack. */ long sys_clone(unsigned long clone_flags, unsigned long newsp, - int __user *parent_tid, int unused, int __user *child_tid) + int __user *parent_tid, void *newtls, int __user *child_tid) { long ret; if (!newsp) newsp = UPT_SP(¤t->thread.regs.regs); + current->thread.forking = 1; ret = do_fork(clone_flags, newsp, ¤t->thread.regs, 0, parent_tid, child_tid); current->thread.forking = 0; - return(ret); + return ret; } /* @@ -104,7 +110,7 @@ long sys_ipc (uint call, int first, int second, union semun fourth; if (!ptr) return -EINVAL; - if (get_user(fourth.__pad, (void **) ptr)) + if (get_user(fourth.__pad, (void __user * __user *) ptr)) return -EFAULT; return sys_semctl (first, second, third, fourth); } diff --git a/arch/um/sys-i386/tls.c b/arch/um/sys-i386/tls.c new file mode 100644 index 000000000000..a3188e861cc7 --- /dev/null +++ b/arch/um/sys-i386/tls.c @@ -0,0 +1,384 @@ +/* + * Copyright (C) 2005 Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> + * Licensed under the GPL + */ + +#include "linux/config.h" +#include "linux/kernel.h" +#include "linux/sched.h" +#include "linux/slab.h" +#include "linux/types.h" +#include "asm/uaccess.h" +#include "asm/ptrace.h" +#include "asm/segment.h" +#include "asm/smp.h" +#include "asm/desc.h" +#include "choose-mode.h" +#include "kern.h" +#include "kern_util.h" +#include "mode_kern.h" +#include "os.h" +#include "mode.h" + +#ifdef CONFIG_MODE_SKAS +#include "skas.h" +#endif + +/* If needed we can detect when it's uninitialized. */ +static int host_supports_tls = -1; +int host_gdt_entry_tls_min = -1; + +#ifdef CONFIG_MODE_SKAS +int do_set_thread_area_skas(struct user_desc *info) +{ + int ret; + u32 cpu; + + cpu = get_cpu(); + ret = os_set_thread_area(info, userspace_pid[cpu]); + put_cpu(); + return ret; +} + +int do_get_thread_area_skas(struct user_desc *info) +{ + int ret; + u32 cpu; + + cpu = get_cpu(); + ret = os_get_thread_area(info, userspace_pid[cpu]); + put_cpu(); + return ret; +} +#endif + +/* + * sys_get_thread_area: get a yet unused TLS descriptor index. + * XXX: Consider leaving one free slot for glibc usage at first place. This must + * be done here (and by changing GDT_ENTRY_TLS_* macros) and nowhere else. + * + * Also, this must be tested when compiling in SKAS mode with dinamic linking + * and running against NPTL. + */ +static int get_free_idx(struct task_struct* task) +{ + struct thread_struct *t = &task->thread; + int idx; + + if (!t->arch.tls_array) + return GDT_ENTRY_TLS_MIN; + + for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++) + if (!t->arch.tls_array[idx].present) + return idx + GDT_ENTRY_TLS_MIN; + return -ESRCH; +} + +static inline void clear_user_desc(struct user_desc* info) +{ + /* Postcondition: LDT_empty(info) returns true. */ + memset(info, 0, sizeof(*info)); + + /* Check the LDT_empty or the i386 sys_get_thread_area code - we obtain + * indeed an empty user_desc. + */ + info->read_exec_only = 1; + info->seg_not_present = 1; +} + +#define O_FORCE 1 + +static int load_TLS(int flags, struct task_struct *to) +{ + int ret = 0; + int idx; + + for (idx = GDT_ENTRY_TLS_MIN; idx < GDT_ENTRY_TLS_MAX; idx++) { + struct uml_tls_struct* curr = &to->thread.arch.tls_array[idx - GDT_ENTRY_TLS_MIN]; + + /* Actually, now if it wasn't flushed it gets cleared and + * flushed to the host, which will clear it.*/ + if (!curr->present) { + if (!curr->flushed) { + clear_user_desc(&curr->tls); + curr->tls.entry_number = idx; + } else { + WARN_ON(!LDT_empty(&curr->tls)); + continue; + } + } + + if (!(flags & O_FORCE) && curr->flushed) + continue; + + ret = do_set_thread_area(&curr->tls); + if (ret) + goto out; + + curr->flushed = 1; + } +out: + return ret; +} + +/* Verify if we need to do a flush for the new process, i.e. if there are any + * present desc's, only if they haven't been flushed. + */ +static inline int needs_TLS_update(struct task_struct *task) +{ + int i; + int ret = 0; + + for (i = GDT_ENTRY_TLS_MIN; i < GDT_ENTRY_TLS_MAX; i++) { + struct uml_tls_struct* curr = &task->thread.arch.tls_array[i - GDT_ENTRY_TLS_MIN]; + + /* Can't test curr->present, we may need to clear a descriptor + * which had a value. */ + if (curr->flushed) + continue; + ret = 1; + break; + } + return ret; +} + +/* On a newly forked process, the TLS descriptors haven't yet been flushed. So + * we mark them as such and the first switch_to will do the job. + */ +void clear_flushed_tls(struct task_struct *task) +{ + int i; + + for (i = GDT_ENTRY_TLS_MIN; i < GDT_ENTRY_TLS_MAX; i++) { + struct uml_tls_struct* curr = &task->thread.arch.tls_array[i - GDT_ENTRY_TLS_MIN]; + + /* Still correct to do this, if it wasn't present on the host it + * will remain as flushed as it was. */ + if (!curr->present) + continue; + + curr->flushed = 0; + } +} + +/* In SKAS0 mode, currently, multiple guest threads sharing the same ->mm have a + * common host process. So this is needed in SKAS0 too. + * + * However, if each thread had a different host process (and this was discussed + * for SMP support) this won't be needed. + * + * And this will not need be used when (and if) we'll add support to the host + * SKAS patch. */ + +int arch_switch_tls_skas(struct task_struct *from, struct task_struct *to) +{ + if (!host_supports_tls) + return 0; + + /* We have no need whatsoever to switch TLS for kernel threads; beyond + * that, that would also result in us calling os_set_thread_area with + * userspace_pid[cpu] == 0, which gives an error. */ + if (likely(to->mm)) + return load_TLS(O_FORCE, to); + + return 0; +} + +int arch_switch_tls_tt(struct task_struct *from, struct task_struct *to) +{ + if (!host_supports_tls) + return 0; + + if (needs_TLS_update(to)) + return load_TLS(0, to); + + return 0; +} + +static int set_tls_entry(struct task_struct* task, struct user_desc *info, + int idx, int flushed) +{ + struct thread_struct *t = &task->thread; + + if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) + return -EINVAL; + + t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].tls = *info; + t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].present = 1; + t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].flushed = flushed; + + return 0; +} + +int arch_copy_tls(struct task_struct *new) +{ + struct user_desc info; + int idx, ret = -EFAULT; + + if (copy_from_user(&info, + (void __user *) UPT_ESI(&new->thread.regs.regs), + sizeof(info))) + goto out; + + ret = -EINVAL; + if (LDT_empty(&info)) + goto out; + + idx = info.entry_number; + + ret = set_tls_entry(new, &info, idx, 0); +out: + return ret; +} + +/* XXX: use do_get_thread_area to read the host value? I'm not at all sure! */ +static int get_tls_entry(struct task_struct* task, struct user_desc *info, int idx) +{ + struct thread_struct *t = &task->thread; + + if (!t->arch.tls_array) + goto clear; + + if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) + return -EINVAL; + + if (!t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].present) + goto clear; + + *info = t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].tls; + +out: + /* Temporary debugging check, to make sure that things have been + * flushed. This could be triggered if load_TLS() failed. + */ + if (unlikely(task == current && !t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].flushed)) { + printk(KERN_ERR "get_tls_entry: task with pid %d got here " + "without flushed TLS.", current->pid); + } + + return 0; +clear: + /* When the TLS entry has not been set, the values read to user in the + * tls_array are 0 (because it's cleared at boot, see + * arch/i386/kernel/head.S:cpu_gdt_table). Emulate that. + */ + clear_user_desc(info); + info->entry_number = idx; + goto out; +} + +asmlinkage int sys_set_thread_area(struct user_desc __user *user_desc) +{ + struct user_desc info; + int idx, ret; + + if (!host_supports_tls) + return -ENOSYS; + + if (copy_from_user(&info, user_desc, sizeof(info))) + return -EFAULT; + + idx = info.entry_number; + + if (idx == -1) { + idx = get_free_idx(current); + if (idx < 0) + return idx; + info.entry_number = idx; + /* Tell the user which slot we chose for him.*/ + if (put_user(idx, &user_desc->entry_number)) + return -EFAULT; + } + + ret = CHOOSE_MODE_PROC(do_set_thread_area_tt, do_set_thread_area_skas, &info); + if (ret) + return ret; + return set_tls_entry(current, &info, idx, 1); +} + +/* + * Perform set_thread_area on behalf of the traced child. + * Note: error handling is not done on the deferred load, and this differ from + * i386. However the only possible error are caused by bugs. + */ +int ptrace_set_thread_area(struct task_struct *child, int idx, + struct user_desc __user *user_desc) +{ + struct user_desc info; + + if (!host_supports_tls) + return -EIO; + + if (copy_from_user(&info, user_desc, sizeof(info))) + return -EFAULT; + + return set_tls_entry(child, &info, idx, 0); +} + +asmlinkage int sys_get_thread_area(struct user_desc __user *user_desc) +{ + struct user_desc info; + int idx, ret; + + if (!host_supports_tls) + return -ENOSYS; + + if (get_user(idx, &user_desc->entry_number)) + return -EFAULT; + + ret = get_tls_entry(current, &info, idx); + if (ret < 0) + goto out; + + if (copy_to_user(user_desc, &info, sizeof(info))) + ret = -EFAULT; + +out: + return ret; +} + +/* + * Perform get_thread_area on behalf of the traced child. + */ +int ptrace_get_thread_area(struct task_struct *child, int idx, + struct user_desc __user *user_desc) +{ + struct user_desc info; + int ret; + + if (!host_supports_tls) + return -EIO; + + ret = get_tls_entry(child, &info, idx); + if (ret < 0) + goto out; + + if (copy_to_user(user_desc, &info, sizeof(info))) + ret = -EFAULT; +out: + return ret; +} + + +/* XXX: This part is probably common to i386 and x86-64. Don't create a common + * file for now, do that when implementing x86-64 support.*/ +static int __init __setup_host_supports_tls(void) { + check_host_supports_tls(&host_supports_tls, &host_gdt_entry_tls_min); + if (host_supports_tls) { + printk(KERN_INFO "Host TLS support detected\n"); + printk(KERN_INFO "Detected host type: "); + switch (host_gdt_entry_tls_min) { + case GDT_ENTRY_TLS_MIN_I386: + printk("i386\n"); + break; + case GDT_ENTRY_TLS_MIN_X86_64: + printk("x86_64\n"); + break; + } + } else + printk(KERN_ERR " Host TLS support NOT detected! " + "TLS support inside UML will not work\n"); + return 1; +} + +__initcall(__setup_host_supports_tls); diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile index a351091fbd99..b5fc22babddf 100644 --- a/arch/um/sys-x86_64/Makefile +++ b/arch/um/sys-x86_64/Makefile @@ -4,31 +4,23 @@ # Licensed under the GPL # -#XXX: why into lib-y? -lib-y = bitops.o bugs.o csum-partial.o delay.o fault.o ldt.o mem.o memcpy.o \ - ptrace.o ptrace_user.o sigcontext.o signal.o syscalls.o \ - syscall_table.o sysrq.o thunk.o -lib-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o +obj-y = bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \ + sigcontext.o signal.o syscalls.o syscall_table.o sysrq.o ksyms.o \ + tls.o -obj-y := ksyms.o -obj-$(CONFIG_MODULES) += module.o um_module.o +obj-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o +obj-$(CONFIG_MODULES) += um_module.o -USER_OBJS := ptrace_user.o sigcontext.o stub_segv.o +subarch-obj-y = lib/bitops.o lib/csum-partial.o lib/memcpy.o lib/thunk.o +subarch-obj-$(CONFIG_MODULES) += kernel/module.o -SYMLINKS = bitops.c csum-copy.S csum-partial.c csum-wrappers.c ldt.c memcpy.S \ - thunk.S module.c +ldt-y = ../sys-i386/ldt.o -include arch/um/scripts/Makefile.rules +USER_OBJS := ptrace_user.o sigcontext.o stub_segv.o -bitops.c-dir = lib -csum-copy.S-dir = lib -csum-partial.c-dir = lib -csum-wrappers.c-dir = lib -ldt.c-dir = /arch/um/sys-i386 -memcpy.S-dir = lib -thunk.S-dir = lib -module.c-dir = kernel +include arch/um/scripts/Makefile.rules -$(obj)/stub_segv.o: _c_flags = $(call unprofile,$(CFLAGS)) +extra-$(CONFIG_MODE_TT) += unmap.o -include arch/um/scripts/Makefile.unmap +$(obj)/stub_segv.o $(obj)/unmap.o: \ + _c_flags = $(call unprofile,$(CFLAGS)) diff --git a/arch/um/sys-x86_64/tls.c b/arch/um/sys-x86_64/tls.c new file mode 100644 index 000000000000..ce1bf1b81c43 --- /dev/null +++ b/arch/um/sys-x86_64/tls.c @@ -0,0 +1,14 @@ +#include "linux/sched.h" + +void debug_arch_force_load_TLS(void) +{ +} + +void clear_flushed_tls(struct task_struct *task) +{ +} + +int arch_copy_tls(struct task_struct *t) +{ + return 0; +} |