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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-15 10:49:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-15 10:49:33 -0700
commit4ecd4ff55ac5c7fe9e232f34a41c4d54f2d825c1 (patch)
tree527d92e360bfcd068e861a280d3aef0d46136fab
parentMerge tag 'upstream-4.13-rc1' of git://git.infradead.org/linux-ubifs (diff)
parentum: Correctly check for PTRACE_GETRESET/SETREGSET (diff)
downloadlinux-dev-4ecd4ff55ac5c7fe9e232f34a41c4d54f2d825c1.tar.xz
linux-dev-4ecd4ff55ac5c7fe9e232f34a41c4d54f2d825c1.zip
Merge branch 'for-linus-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml
Pull UML updates from Richard Weinberger: "Mostly fixes for UML: - First round of fixes for PTRACE_GETRESET/SETREGSET - A printf vs printk cleanup - Minor improvements" * 'for-linus-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: um: Correctly check for PTRACE_GETRESET/SETREGSET um: v2: Use generic NOTES macro um: Add kerneldoc for userspace_tramp() and start_userspace() um: Add kerneldoc for segv_handler um: stub-data.h: remove superfluous include um: userspace - be more verbose in ptrace set regs error um: add dummy ioremap and iounmap functions um: Allow building and running on older hosts um: Avoid longjmp/setjmp symbol clashes with libpthread.a um: console: Ignore console= option um: Use os_warn to print out pre-boot warning/error messages um: Add os_warn() for pre-boot warning/error messages um: Use os_info for the messages on normal path um: Add os_info() for pre-boot information messages um: Use printk instead of printf in make_uml_dir
-rw-r--r--arch/um/Makefile4
-rw-r--r--arch/um/drivers/stdio_console.c3
-rw-r--r--arch/um/include/asm/common.lds.S2
-rw-r--r--arch/um/include/asm/io.h17
-rw-r--r--arch/um/include/shared/os.h4
-rw-r--r--arch/um/include/shared/skas/stub-data.h2
-rw-r--r--arch/um/kernel/physmem.c10
-rw-r--r--arch/um/kernel/trap.c10
-rw-r--r--arch/um/kernel/um_arch.c16
-rw-r--r--arch/um/kernel/umid.c4
-rw-r--r--arch/um/os-Linux/execvp.c2
-rw-r--r--arch/um/os-Linux/main.c9
-rw-r--r--arch/um/os-Linux/mem.c28
-rw-r--r--arch/um/os-Linux/skas/process.c41
-rw-r--r--arch/um/os-Linux/start_up.c28
-rw-r--r--arch/um/os-Linux/umid.c19
-rw-r--r--arch/um/os-Linux/util.c34
-rw-r--r--arch/x86/um/os-Linux/registers.c12
-rw-r--r--arch/x86/um/setjmp_32.S16
-rw-r--r--arch/x86/um/setjmp_64.S16
-rw-r--r--arch/x86/um/user-offsets.c6
21 files changed, 201 insertions, 82 deletions
diff --git a/arch/um/Makefile b/arch/um/Makefile
index 0ca46ededfc7..6ca4f66085c1 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -59,10 +59,14 @@ KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
# Same things for in6addr_loopback and mktime - found in libc. For these two we
# only get link-time error, luckily.
#
+# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
+# embedded copy of longjmp, same thing for setjmp.
+#
# These apply to USER_CFLAGS to.
KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
+ -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
-Din6addr_loopback=kernel_in6addr_loopback \
-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
index 7b361f36ca96..c90817b04da9 100644
--- a/arch/um/drivers/stdio_console.c
+++ b/arch/um/drivers/stdio_console.c
@@ -192,6 +192,9 @@ __uml_exitcall(console_exit);
static int console_chan_setup(char *str)
{
+ if (!strncmp(str, "sole=", 5)) /* console= option specifies tty */
+ return 0;
+
line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console");
return 1;
}
diff --git a/arch/um/include/asm/common.lds.S b/arch/um/include/asm/common.lds.S
index 133055311dce..9e6d5997cfc4 100644
--- a/arch/um/include/asm/common.lds.S
+++ b/arch/um/include/asm/common.lds.S
@@ -15,7 +15,7 @@
PROVIDE (_unprotected_end = .);
. = ALIGN(4096);
- .note : { *(.note.*) }
+ NOTES
EXCEPTION_TABLE(0)
BUG_TABLE
diff --git a/arch/um/include/asm/io.h b/arch/um/include/asm/io.h
new file mode 100644
index 000000000000..8f35d574f35b
--- /dev/null
+++ b/arch/um/include/asm/io.h
@@ -0,0 +1,17 @@
+#ifndef _ASM_UM_IO_H
+#define _ASM_UM_IO_H
+
+#define ioremap ioremap
+static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
+{
+ return (void __iomem *)(unsigned long)offset;
+}
+
+#define iounmap iounmap
+static inline void iounmap(void __iomem *addr)
+{
+}
+
+#include <asm-generic/io.h>
+
+#endif
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index cd1fa97776c3..574e03fc7ba2 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -242,6 +242,10 @@ extern void setup_hostinfo(char *buf, int len);
extern void os_dump_core(void) __attribute__ ((noreturn));
extern void um_early_printk(const char *s, unsigned int n);
extern void os_fix_helper_signals(void);
+extern void os_info(const char *fmt, ...)
+ __attribute__ ((format (printf, 1, 2)));
+extern void os_warn(const char *fmt, ...)
+ __attribute__ ((format (printf, 1, 2)));
/* time.c */
extern void os_idle_sleep(unsigned long long nsecs);
diff --git a/arch/um/include/shared/skas/stub-data.h b/arch/um/include/shared/skas/stub-data.h
index a9deece956bf..13f404e1262b 100644
--- a/arch/um/include/shared/skas/stub-data.h
+++ b/arch/um/include/shared/skas/stub-data.h
@@ -8,8 +8,6 @@
#ifndef __STUB_DATA_H
#define __STUB_DATA_H
-#include <time.h>
-
struct stub_data {
unsigned long offset;
int fd;
diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index 4c9861b421fd..f02596e9931d 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -89,8 +89,8 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
offset = uml_reserved - uml_physmem;
map_size = len - offset;
if(map_size <= 0) {
- printf("Too few physical memory! Needed=%d, given=%d\n",
- offset, len);
+ os_warn("Too few physical memory! Needed=%lu, given=%lu\n",
+ offset, len);
exit(1);
}
@@ -99,9 +99,9 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
map_size, 1, 1, 1);
if (err < 0) {
- printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
- "failed - errno = %d\n", map_size,
- (void *) uml_reserved, err);
+ os_warn("setup_physmem - mapping %ld bytes of memory at 0x%p "
+ "failed - errno = %d\n", map_size,
+ (void *) uml_reserved, err);
exit(1);
}
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index 59158871b9fc..4e6fcb32620f 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -183,6 +183,16 @@ void fatal_sigsegv(void)
os_dump_core();
}
+/**
+ * segv_handler() - the SIGSEGV handler
+ * @sig: the signal number
+ * @unused_si: the signal info struct; unused in this handler
+ * @regs: the ptrace register information
+ *
+ * The handler first extracts the faultinfo from the UML ptrace regs struct.
+ * If the userfault did not happen in an UML userspace process, bad_segv is called.
+ * Otherwise the signal did happen in a cloned userspace process, handle it.
+ */
void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
struct faultinfo * fi = UPT_FAULTINFO(regs);
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 7b5640117325..f433690b9b37 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -34,7 +34,7 @@ static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
static void __init add_arg(char *arg)
{
if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
- printf("add_arg: Too many command line arguments!\n");
+ os_warn("add_arg: Too many command line arguments!\n");
exit(1);
}
if (strlen(command_line) > 0)
@@ -120,6 +120,7 @@ static const char *usage_string =
static int __init uml_version_setup(char *line, int *add)
{
+ /* Explicitly use printf() to show version in stdout */
printf("%s\n", init_utsname()->release);
exit(0);
@@ -148,8 +149,8 @@ __uml_setup("root=", uml_root_setup,
static int __init no_skas_debug_setup(char *line, int *add)
{
- printf("'debug' is not necessary to gdb UML in skas mode - run \n");
- printf("'gdb linux'\n");
+ os_warn("'debug' is not necessary to gdb UML in skas mode - run\n");
+ os_warn("'gdb linux'\n");
return 0;
}
@@ -165,6 +166,7 @@ static int __init Usage(char *line, int *add)
printf(usage_string, init_utsname()->release);
p = &__uml_help_start;
+ /* Explicitly use printf() to show help in stdout */
while (p < &__uml_help_end) {
printf("%s", *p);
p++;
@@ -283,8 +285,8 @@ int __init linux_main(int argc, char **argv)
diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
if (diff > 1024 * 1024) {
- printf("Adding %ld bytes to physical memory to account for "
- "exec-shield gap\n", diff);
+ os_info("Adding %ld bytes to physical memory to account for "
+ "exec-shield gap\n", diff);
physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
}
@@ -324,8 +326,8 @@ int __init linux_main(int argc, char **argv)
end_vm = start_vm + virtmem_size;
if (virtmem_size < physmem_size)
- printf("Kernel virtual memory size shrunk to %lu bytes\n",
- virtmem_size);
+ os_info("Kernel virtual memory size shrunk to %lu bytes\n",
+ virtmem_size);
os_flush_stdout();
diff --git a/arch/um/kernel/umid.c b/arch/um/kernel/umid.c
index f6cc3bd61781..10bf4aca529f 100644
--- a/arch/um/kernel/umid.c
+++ b/arch/um/kernel/umid.c
@@ -16,14 +16,14 @@ static int __init set_umid_arg(char *name, int *add)
int err;
if (umid_inited) {
- printf("umid already set\n");
+ os_warn("umid already set\n");
return 0;
}
*add = 0;
err = set_umid(name);
if (err == -EEXIST)
- printf("umid '%s' already in use\n", name);
+ os_warn("umid '%s' already in use\n", name);
else if (!err)
umid_inited = 1;
diff --git a/arch/um/os-Linux/execvp.c b/arch/um/os-Linux/execvp.c
index 8fb25ca07c46..84a0777c2a45 100644
--- a/arch/um/os-Linux/execvp.c
+++ b/arch/um/os-Linux/execvp.c
@@ -136,7 +136,7 @@ int main(int argc, char**argv)
int ret;
argc--;
if (!argc) {
- fprintf(stderr, "Not enough arguments\n");
+ os_warn("Not enough arguments\n");
return 1;
}
argv++;
diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
index 9d499de87e63..5f970ece5ac3 100644
--- a/arch/um/os-Linux/main.c
+++ b/arch/um/os-Linux/main.c
@@ -74,8 +74,8 @@ static void install_fatal_handler(int sig)
action.sa_restorer = NULL;
action.sa_handler = last_ditch_exit;
if (sigaction(sig, &action, NULL) < 0) {
- printf("failed to install handler for signal %d - errno = %d\n",
- sig, errno);
+ os_warn("failed to install handler for signal %d "
+ "- errno = %d\n", sig, errno);
exit(1);
}
}
@@ -175,7 +175,7 @@ int __init main(int argc, char **argv, char **envp)
/* disable SIGIO for the fds and set SIGIO to be ignored */
err = deactivate_all_fds();
if (err)
- printf("deactivate_all_fds failed, errno = %d\n", -err);
+ os_warn("deactivate_all_fds failed, errno = %d\n", -err);
/*
* Let any pending signals fire now. This ensures
@@ -184,14 +184,13 @@ int __init main(int argc, char **argv, char **envp)
*/
unblock_signals();
+ os_info("\n");
/* Reboot */
if (ret) {
- printf("\n");
execvp(new_argv[0], new_argv);
perror("Failed to exec kernel");
ret = 1;
}
- printf("\n");
return uml_exitcode;
}
diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
index 8b1767668515..e162a95ad7dd 100644
--- a/arch/um/os-Linux/mem.c
+++ b/arch/um/os-Linux/mem.c
@@ -25,13 +25,13 @@ static int __init check_tmpfs(const char *dir)
{
struct statfs st;
- printf("Checking if %s is on tmpfs...", dir);
+ os_info("Checking if %s is on tmpfs...", dir);
if (statfs(dir, &st) < 0) {
- printf("%s\n", strerror(errno));
+ os_info("%s\n", strerror(errno));
} else if (st.f_type != TMPFS_MAGIC) {
- printf("no\n");
+ os_info("no\n");
} else {
- printf("OK\n");
+ os_info("OK\n");
return 0;
}
return -1;
@@ -61,18 +61,18 @@ static char * __init choose_tempdir(void)
int i;
const char *dir;
- printf("Checking environment variables for a tempdir...");
+ os_info("Checking environment variables for a tempdir...");
for (i = 0; vars[i]; i++) {
dir = getenv(vars[i]);
if ((dir != NULL) && (*dir != '\0')) {
- printf("%s\n", dir);
+ os_info("%s\n", dir);
if (check_tmpfs(dir) >= 0)
goto done;
else
goto warn;
}
}
- printf("none found\n");
+ os_info("none found\n");
for (i = 0; tmpfs_dirs[i]; i++) {
dir = tmpfs_dirs[i];
@@ -82,7 +82,7 @@ static char * __init choose_tempdir(void)
dir = fallback_dir;
warn:
- printf("Warning: tempdir %s is not on tmpfs\n", dir);
+ os_warn("Warning: tempdir %s is not on tmpfs\n", dir);
done:
/* Make a copy since getenv results may not remain valid forever. */
return strdup(dir);
@@ -100,7 +100,7 @@ static int __init make_tempfile(const char *template)
if (tempdir == NULL) {
tempdir = choose_tempdir();
if (tempdir == NULL) {
- fprintf(stderr, "Failed to choose tempdir: %s\n",
+ os_warn("Failed to choose tempdir: %s\n",
strerror(errno));
return -1;
}
@@ -125,7 +125,7 @@ static int __init make_tempfile(const char *template)
strcat(tempname, template);
fd = mkstemp(tempname);
if (fd < 0) {
- fprintf(stderr, "open - cannot create %s: %s\n", tempname,
+ os_warn("open - cannot create %s: %s\n", tempname,
strerror(errno));
goto out;
}
@@ -194,16 +194,16 @@ void __init check_tmpexec(void)
addr = mmap(NULL, UM_KERN_PAGE_SIZE,
PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
- printf("Checking PROT_EXEC mmap in %s...", tempdir);
+ os_info("Checking PROT_EXEC mmap in %s...", tempdir);
if (addr == MAP_FAILED) {
err = errno;
- printf("%s\n", strerror(err));
+ os_warn("%s\n", strerror(err));
close(fd);
if (err == EPERM)
- printf("%s must be not mounted noexec\n", tempdir);
+ os_warn("%s must be not mounted noexec\n", tempdir);
exit(1);
}
- printf("OK\n");
+ os_info("OK\n");
munmap(addr, UM_KERN_PAGE_SIZE);
close(fd);
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 03b3c4cc7735..819d68656673 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -108,7 +108,7 @@ static void get_skas_faultinfo(int pid, struct faultinfo *fi)
wait_stub_done(pid);
/*
- * faultinfo is prepared by the stub-segv-handler at start of
+ * faultinfo is prepared by the stub_segv_handler at start of
* the stub stack page. We just have to copy it.
*/
memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
@@ -175,6 +175,21 @@ static void handle_trap(int pid, struct uml_pt_regs *regs,
extern char __syscall_stub_start[];
+/**
+ * userspace_tramp() - userspace trampoline
+ * @stack: pointer to the new userspace stack page, can be NULL, if? FIXME:
+ *
+ * The userspace trampoline is used to setup a new userspace process in start_userspace() after it was clone()'ed.
+ * This function will run on a temporary stack page.
+ * It ptrace()'es itself, then
+ * Two pages are mapped into the userspace address space:
+ * - STUB_CODE (with EXEC), which contains the skas stub code
+ * - STUB_DATA (with R/W), which contains a data page that is used to transfer certain data between the UML userspace process and the UML kernel.
+ * Also for the userspace process a SIGSEGV handler is installed to catch pagefaults in the userspace process.
+ * And last the process stops itself to give control to the UML kernel for this userspace process.
+ *
+ * Return: Always zero, otherwise the current userspace process is ended with non null exit() call
+ */
static int userspace_tramp(void *stack)
{
void *addr;
@@ -236,12 +251,24 @@ static int userspace_tramp(void *stack)
int userspace_pid[NR_CPUS];
+/**
+ * start_userspace() - prepare a new userspace process
+ * @stub_stack: pointer to the stub stack. Can be NULL, if? FIXME:
+ *
+ * Setups a new temporary stack page that is used while userspace_tramp() runs
+ * Clones the kernel process into a new userspace process, with FDs only.
+ *
+ * Return: When positive: the process id of the new userspace process,
+ * when negative: an error number.
+ * FIXME: can PIDs become negative?!
+ */
int start_userspace(unsigned long stub_stack)
{
void *stack;
unsigned long sp;
int pid, status, n, flags, err;
+ /* setup a temporary stack page */
stack = mmap(NULL, UM_KERN_PAGE_SIZE,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
@@ -252,10 +279,12 @@ int start_userspace(unsigned long stub_stack)
return err;
}
+ /* set stack pointer to the end of the stack page, so it can grow downwards */
sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
flags = CLONE_FILES | SIGCHLD;
+ /* clone into new userspace process */
pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
if (pid < 0) {
err = -errno;
@@ -323,11 +352,17 @@ void userspace(struct uml_pt_regs *regs)
* fail. In this case, there is nothing to do but
* just kill the process.
*/
- if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp))
+ if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp)) {
+ printk(UM_KERN_ERR "userspace - ptrace set regs "
+ "failed, errno = %d\n", errno);
fatal_sigsegv();
+ }
- if (put_fp_registers(pid, regs->fp))
+ if (put_fp_registers(pid, regs->fp)) {
+ printk(UM_KERN_ERR "userspace - ptrace set fp regs "
+ "failed, errno = %d\n", errno);
fatal_sigsegv();
+ }
/* Now we set local_using_sysemu to be used for one loop */
local_using_sysemu = get_using_sysemu();
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 22a358ef1b0c..b1b6b75c5b17 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -166,7 +166,7 @@ static void __init check_sysemu(void)
unsigned long regs[MAX_REG_NR];
int pid, n, status, count=0;
- non_fatal("Checking syscall emulation patch for ptrace...");
+ os_info("Checking syscall emulation patch for ptrace...");
sysemu_supported = 0;
pid = start_ptraced_child();
@@ -199,10 +199,10 @@ static void __init check_sysemu(void)
goto fail_stopped;
sysemu_supported = 1;
- non_fatal("OK\n");
+ os_info("OK\n");
set_using_sysemu(!force_sysemu_disabled);
- non_fatal("Checking advanced syscall emulation patch for ptrace...");
+ os_info("Checking advanced syscall emulation patch for ptrace...");
pid = start_ptraced_child();
if ((ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
@@ -244,7 +244,7 @@ static void __init check_sysemu(void)
goto fail_stopped;
sysemu_supported = 2;
- non_fatal("OK\n");
+ os_info("OK\n");
if (!force_sysemu_disabled)
set_using_sysemu(sysemu_supported);
@@ -260,7 +260,7 @@ static void __init check_ptrace(void)
{
int pid, syscall, n, status;
- non_fatal("Checking that ptrace can change system call numbers...");
+ os_info("Checking that ptrace can change system call numbers...");
pid = start_ptraced_child();
if ((ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
@@ -292,7 +292,7 @@ static void __init check_ptrace(void)
}
}
stop_ptraced_child(pid, 0, 1);
- non_fatal("OK\n");
+ os_info("OK\n");
check_sysemu();
}
@@ -308,15 +308,17 @@ static void __init check_coredump_limit(void)
return;
}
- printf("Core dump limits :\n\tsoft - ");
+ os_info("Core dump limits :\n\tsoft - ");
if (lim.rlim_cur == RLIM_INFINITY)
- printf("NONE\n");
- else printf("%lu\n", lim.rlim_cur);
+ os_info("NONE\n");
+ else
+ os_info("%llu\n", (unsigned long long)lim.rlim_cur);
- printf("\thard - ");
+ os_info("\thard - ");
if (lim.rlim_max == RLIM_INFINITY)
- printf("NONE\n");
- else printf("%lu\n", lim.rlim_max);
+ os_info("NONE\n");
+ else
+ os_info("%llu\n", (unsigned long long)lim.rlim_max);
}
void __init os_early_checks(void)
@@ -349,7 +351,7 @@ int __init parse_iomem(char *str, int *add)
driver = str;
file = strchr(str,',');
if (file == NULL) {
- fprintf(stderr, "parse_iomem : failed to parse iomem\n");
+ os_warn("parse_iomem : failed to parse iomem\n");
goto out;
}
*file = '\0';
diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c
index c1dc89261f67..998fbb445458 100644
--- a/arch/um/os-Linux/umid.c
+++ b/arch/um/os-Linux/umid.c
@@ -35,8 +35,9 @@ static int __init make_uml_dir(void)
err = -ENOENT;
if (home == NULL) {
- printk(UM_KERN_ERR "make_uml_dir : no value in "
- "environment for $HOME\n");
+ printk(UM_KERN_ERR
+ "%s: no value in environment for $HOME\n",
+ __func__);
goto err;
}
strlcpy(dir, home, sizeof(dir));
@@ -50,13 +51,15 @@ static int __init make_uml_dir(void)
err = -ENOMEM;
uml_dir = malloc(strlen(dir) + 1);
if (uml_dir == NULL) {
- printf("make_uml_dir : malloc failed, errno = %d\n", errno);
+ printk(UM_KERN_ERR "%s : malloc failed, errno = %d\n",
+ __func__, errno);
goto err;
}
strcpy(uml_dir, dir);
if ((mkdir(uml_dir, 0777) < 0) && (errno != EEXIST)) {
- printf("Failed to mkdir '%s': %s\n", uml_dir, strerror(errno));
+ printk(UM_KERN_ERR "Failed to mkdir '%s': %s\n",
+ uml_dir, strerror(errno));
err = -errno;
goto err_free;
}
@@ -351,7 +354,7 @@ char *get_umid(void)
static int __init set_uml_dir(char *name, int *add)
{
if (*name == '\0') {
- printf("uml_dir can't be an empty string\n");
+ os_warn("uml_dir can't be an empty string\n");
return 0;
}
@@ -362,7 +365,7 @@ static int __init set_uml_dir(char *name, int *add)
uml_dir = malloc(strlen(name) + 2);
if (uml_dir == NULL) {
- printf("Failed to malloc uml_dir - error = %d\n", errno);
+ os_warn("Failed to malloc uml_dir - error = %d\n", errno);
/*
* Return 0 here because do_initcalls doesn't look at
@@ -387,8 +390,8 @@ static void remove_umid_dir(void)
sprintf(dir, "%s%s", uml_dir, umid);
err = remove_files_and_dir(dir);
if (err)
- printf("remove_umid_dir - remove_files_and_dir failed with "
- "err = %d\n", err);
+ os_warn("%s - remove_files_and_dir failed with err = %d\n",
+ __func__, err);
}
__uml_exitcall(remove_umid_dir);
diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
index faee55ef6d2f..8cc8b2617a67 100644
--- a/arch/um/os-Linux/util.c
+++ b/arch/um/os-Linux/util.c
@@ -13,6 +13,7 @@
#include <wait.h>
#include <sys/mman.h>
#include <sys/utsname.h>
+#include <init.h>
#include <os.h>
void stack_protections(unsigned long address)
@@ -152,3 +153,36 @@ void um_early_printk(const char *s, unsigned int n)
{
printf("%.*s", n, s);
}
+
+static int quiet_info;
+
+static int __init quiet_cmd_param(char *str, int *add)
+{
+ quiet_info = 1;
+ return 0;
+}
+
+__uml_setup("quiet", quiet_cmd_param,
+"quiet\n"
+" Turns off information messages during boot.\n\n");
+
+void os_info(const char *fmt, ...)
+{
+ va_list list;
+
+ if (quiet_info)
+ return;
+
+ va_start(list, fmt);
+ vfprintf(stderr, fmt, list);
+ va_end(list);
+}
+
+void os_warn(const char *fmt, ...)
+{
+ va_list list;
+
+ va_start(list, fmt);
+ vfprintf(stderr, fmt, list);
+ va_end(list);
+}
diff --git a/arch/x86/um/os-Linux/registers.c b/arch/x86/um/os-Linux/registers.c
index 00f54a91bb4b..28775f55bde2 100644
--- a/arch/x86/um/os-Linux/registers.c
+++ b/arch/x86/um/os-Linux/registers.c
@@ -26,6 +26,7 @@ int save_i387_registers(int pid, unsigned long *fp_regs)
int save_fp_registers(int pid, unsigned long *fp_regs)
{
+#ifdef PTRACE_GETREGSET
struct iovec iov;
if (have_xstate_support) {
@@ -34,9 +35,9 @@ int save_fp_registers(int pid, unsigned long *fp_regs)
if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
return -errno;
return 0;
- } else {
+ } else
+#endif
return save_i387_registers(pid, fp_regs);
- }
}
int restore_i387_registers(int pid, unsigned long *fp_regs)
@@ -48,6 +49,7 @@ int restore_i387_registers(int pid, unsigned long *fp_regs)
int restore_fp_registers(int pid, unsigned long *fp_regs)
{
+#ifdef PTRACE_SETREGSET
struct iovec iov;
if (have_xstate_support) {
@@ -56,9 +58,9 @@ int restore_fp_registers(int pid, unsigned long *fp_regs)
if (ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
return -errno;
return 0;
- } else {
+ } else
+#endif
return restore_i387_registers(pid, fp_regs);
- }
}
#ifdef __i386__
@@ -122,6 +124,7 @@ int put_fp_registers(int pid, unsigned long *regs)
void arch_init_registers(int pid)
{
+#ifdef PTRACE_GETREGSET
struct _xstate fp_regs;
struct iovec iov;
@@ -129,6 +132,7 @@ void arch_init_registers(int pid)
iov.iov_len = sizeof(struct _xstate);
if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) == 0)
have_xstate_support = 1;
+#endif
}
#endif
diff --git a/arch/x86/um/setjmp_32.S b/arch/x86/um/setjmp_32.S
index b766792c9933..39053192918d 100644
--- a/arch/x86/um/setjmp_32.S
+++ b/arch/x86/um/setjmp_32.S
@@ -16,9 +16,9 @@
.text
.align 4
- .globl setjmp
- .type setjmp, @function
-setjmp:
+ .globl kernel_setjmp
+ .type kernel_setjmp, @function
+kernel_setjmp:
#ifdef _REGPARM
movl %eax,%edx
#else
@@ -35,13 +35,13 @@ setjmp:
movl %ecx,20(%edx) # Return address
ret
- .size setjmp,.-setjmp
+ .size kernel_setjmp,.-kernel_setjmp
.text
.align 4
- .globl longjmp
- .type longjmp, @function
-longjmp:
+ .globl kernel_longjmp
+ .type kernel_longjmp, @function
+kernel_longjmp:
#ifdef _REGPARM
xchgl %eax,%edx
#else
@@ -55,4 +55,4 @@ longjmp:
movl 16(%edx),%edi
jmp *20(%edx)
- .size longjmp,.-longjmp
+ .size kernel_longjmp,.-kernel_longjmp
diff --git a/arch/x86/um/setjmp_64.S b/arch/x86/um/setjmp_64.S
index 45f547b4043e..c56942e1a38c 100644
--- a/arch/x86/um/setjmp_64.S
+++ b/arch/x86/um/setjmp_64.S
@@ -18,9 +18,9 @@
.text
.align 4
- .globl setjmp
- .type setjmp, @function
-setjmp:
+ .globl kernel_setjmp
+ .type kernel_setjmp, @function
+kernel_setjmp:
pop %rsi # Return address, and adjust the stack
xorl %eax,%eax # Return value
movq %rbx,(%rdi)
@@ -34,13 +34,13 @@ setjmp:
movq %rsi,56(%rdi) # Return address
ret
- .size setjmp,.-setjmp
+ .size kernel_setjmp,.-kernel_setjmp
.text
.align 4
- .globl longjmp
- .type longjmp, @function
-longjmp:
+ .globl kernel_longjmp
+ .type kernel_longjmp, @function
+kernel_longjmp:
movl %esi,%eax # Return value (int)
movq (%rdi),%rbx
movq 8(%rdi),%rsp
@@ -51,4 +51,4 @@ longjmp:
movq 48(%rdi),%r15
jmp *56(%rdi)
- .size longjmp,.-longjmp
+ .size kernel_longjmp,.-kernel_longjmp
diff --git a/arch/x86/um/user-offsets.c b/arch/x86/um/user-offsets.c
index cb3c22370cf5..ae4cd58c0c7a 100644
--- a/arch/x86/um/user-offsets.c
+++ b/arch/x86/um/user-offsets.c
@@ -5,7 +5,7 @@
#include <sys/mman.h>
#include <sys/user.h>
#define __FRAME_OFFSETS
-#include <asm/ptrace.h>
+#include <linux/ptrace.h>
#include <asm/types.h>
#ifdef __i386__
@@ -50,7 +50,11 @@ void foo(void)
DEFINE(HOST_GS, GS);
DEFINE(HOST_ORIG_AX, ORIG_EAX);
#else
+#if defined(PTRACE_GETREGSET) && defined(PTRACE_SETREGSET)
DEFINE(HOST_FP_SIZE, sizeof(struct _xstate) / sizeof(unsigned long));
+#else
+ DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long));
+#endif
DEFINE_LONGS(HOST_BX, RBX);
DEFINE_LONGS(HOST_CX, RCX);
DEFINE_LONGS(HOST_DI, RDI);