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-rw-r--r--arch/um/os-Linux/main.c217
1 files changed, 112 insertions, 105 deletions
diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
index 23da27d2256..df9191acd92 100644
--- a/arch/um/os-Linux/main.c
+++ b/arch/um/os-Linux/main.c
@@ -1,59 +1,42 @@
/*
- * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
-#include <string.h>
-#include <signal.h>
+#include <unistd.h>
#include <errno.h>
+#include <signal.h>
+#include <string.h>
#include <sys/resource.h>
-#include <sys/mman.h>
-#include <sys/user.h>
-#include <asm/page.h>
-#include "user_util.h"
-#include "kern_util.h"
-#include "mem_user.h"
-#include "signal_user.h"
-#include "time_user.h"
-#include "irq_user.h"
-#include "user.h"
-#include "init.h"
-#include "mode.h"
-#include "choose-mode.h"
-#include "uml-config.h"
-#include "os.h"
-
-/* Set in set_stklim, which is called from main and __wrap_malloc.
- * __wrap_malloc only calls it if main hasn't started.
- */
-unsigned long stacksizelim;
-
-/* Set in main */
-char *linux_prog;
+#include <as-layout.h>
+#include <init.h>
+#include <kern_util.h>
+#include <os.h>
+#include <um_malloc.h>
#define PGD_BOUND (4 * 1024 * 1024)
#define STACKSIZE (8 * 1024 * 1024)
#define THREAD_NAME_LEN (256)
+long elf_aux_hwcap;
+
static void set_stklim(void)
{
struct rlimit lim;
- if(getrlimit(RLIMIT_STACK, &lim) < 0){
+ if (getrlimit(RLIMIT_STACK, &lim) < 0) {
perror("getrlimit");
exit(1);
}
- if((lim.rlim_cur == RLIM_INFINITY) || (lim.rlim_cur > STACKSIZE)){
+ if ((lim.rlim_cur == RLIM_INFINITY) || (lim.rlim_cur > STACKSIZE)) {
lim.rlim_cur = STACKSIZE;
- if(setrlimit(RLIMIT_STACK, &lim) < 0){
+ if (setrlimit(RLIMIT_STACK, &lim) < 0) {
perror("setrlimit");
exit(1);
}
}
- stacksizelim = (lim.rlim_cur + PGD_BOUND - 1) & ~(PGD_BOUND - 1);
}
static __init void do_uml_initcalls(void)
@@ -61,7 +44,7 @@ static __init void do_uml_initcalls(void)
initcall_t *call;
call = &__uml_initcall_start;
- while (call < &__uml_initcall_end){;
+ while (call < &__uml_initcall_end) {
(*call)();
call++;
}
@@ -69,156 +52,179 @@ static __init void do_uml_initcalls(void)
static void last_ditch_exit(int sig)
{
- signal(SIGINT, SIG_DFL);
- signal(SIGTERM, SIG_DFL);
- signal(SIGHUP, SIG_DFL);
uml_cleanup();
exit(1);
}
-extern int uml_exitcode;
-
-extern void scan_elf_aux( char **envp);
-
-int main(int argc, char **argv, char **envp)
+static void install_fatal_handler(int sig)
{
- char **new_argv;
- sigset_t mask;
- int ret, i, err;
+ struct sigaction action;
- /* Enable all signals except SIGIO - in some environments, we can
- * enter with some signals blocked
- */
+ /* All signals are enabled in this handler ... */
+ sigemptyset(&action.sa_mask);
- sigemptyset(&mask);
- sigaddset(&mask, SIGIO);
- if(sigprocmask(SIG_SETMASK, &mask, NULL) < 0){
- perror("sigprocmask");
+ /*
+ * ... including the signal being handled, plus we want the
+ * handler reset to the default behavior, so that if an exit
+ * handler is hanging for some reason, the UML will just die
+ * after this signal is sent a second time.
+ */
+ action.sa_flags = SA_RESETHAND | SA_NODEFER;
+ 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);
exit(1);
}
+}
-#ifdef UML_CONFIG_CMDLINE_ON_HOST
- /* Allocate memory for thread command lines */
- if(argc < 2 || strlen(argv[1]) < THREAD_NAME_LEN - 1){
+#define UML_LIB_PATH ":" OS_LIB_PATH "/uml"
- char padding[THREAD_NAME_LEN] = {
- [ 0 ... THREAD_NAME_LEN - 2] = ' ', '\0'
- };
+static void setup_env_path(void)
+{
+ char *new_path = NULL;
+ char *old_path = NULL;
+ int path_len = 0;
+
+ old_path = getenv("PATH");
+ /*
+ * if no PATH variable is set or it has an empty value
+ * just use the default + /usr/lib/uml
+ */
+ if (!old_path || (path_len = strlen(old_path)) == 0) {
+ if (putenv("PATH=:/bin:/usr/bin/" UML_LIB_PATH))
+ perror("couldn't putenv");
+ return;
+ }
- new_argv = malloc((argc + 2) * sizeof(char*));
- if(!new_argv) {
- perror("Allocating extended argv");
- exit(1);
- }
+ /* append /usr/lib/uml to the existing path */
+ path_len += strlen("PATH=" UML_LIB_PATH) + 1;
+ new_path = malloc(path_len);
+ if (!new_path) {
+ perror("couldn't malloc to set a new PATH");
+ return;
+ }
+ snprintf(new_path, path_len, "PATH=%s" UML_LIB_PATH, old_path);
+ if (putenv(new_path)) {
+ perror("couldn't putenv to set a new PATH");
+ free(new_path);
+ }
+}
- new_argv[0] = argv[0];
- new_argv[1] = padding;
+extern void scan_elf_aux( char **envp);
- for(i = 2; i <= argc; i++)
- new_argv[i] = argv[i - 1];
- new_argv[argc + 1] = NULL;
+int __init main(int argc, char **argv, char **envp)
+{
+ char **new_argv;
+ int ret, i, err;
- execvp(new_argv[0], new_argv);
- perror("execing with extended args");
- exit(1);
- }
-#endif
+ set_stklim();
- linux_prog = argv[0];
+ setup_env_path();
- set_stklim();
+ setsid();
new_argv = malloc((argc + 1) * sizeof(char *));
- if(new_argv == NULL){
+ if (new_argv == NULL) {
perror("Mallocing argv");
exit(1);
}
- for(i=0;i<argc;i++){
+ for (i = 0; i < argc; i++) {
new_argv[i] = strdup(argv[i]);
- if(new_argv[i] == NULL){
+ if (new_argv[i] == NULL) {
perror("Mallocing an arg");
exit(1);
}
}
new_argv[argc] = NULL;
- set_handler(SIGINT, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
- set_handler(SIGTERM, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
- set_handler(SIGHUP, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
+ /*
+ * Allow these signals to bring down a UML if all other
+ * methods of control fail.
+ */
+ install_fatal_handler(SIGINT);
+ install_fatal_handler(SIGTERM);
- scan_elf_aux( envp);
+#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
+ scan_elf_aux(envp);
+#endif
do_uml_initcalls();
+ change_sig(SIGPIPE, 0);
ret = linux_main(argc, argv);
- /* Disable SIGPROF - I have no idea why libc doesn't do this or turn
+ /*
+ * Disable SIGPROF - I have no idea why libc doesn't do this or turn
* off the profiling time, but UML dies with a SIGPROF just before
* exiting when profiling is active.
*/
change_sig(SIGPROF, 0);
- /* This signal stuff used to be in the reboot case. However,
+ /*
+ * This signal stuff used to be in the reboot case. However,
* sometimes a SIGVTALRM can come in when we're halting (reproducably
* when writing out gcov information, presumably because that takes
* some time) and cause a segfault.
*/
- /* stop timers and set SIG*ALRM to be ignored */
+ /* stop timers and set SIGVTALRM to be ignored */
disable_timer();
/* disable SIGIO for the fds and set SIGIO to be ignored */
err = deactivate_all_fds();
- if(err)
+ if (err)
printf("deactivate_all_fds failed, errno = %d\n", -err);
- /* Let any pending signals fire now. This ensures
+ /*
+ * Let any pending signals fire now. This ensures
* that they won't be delivered after the exec, when
* they are definitely not expected.
*/
unblock_signals();
/* Reboot */
- if(ret){
+ if (ret) {
printf("\n");
execvp(new_argv[0], new_argv);
perror("Failed to exec kernel");
ret = 1;
}
printf("\n");
- return(uml_exitcode);
+ return uml_exitcode;
}
-#define CAN_KMALLOC() \
- (kmalloc_ok && CHOOSE_MODE((os_getpid() != tracing_pid), 1))
-
extern void *__real_malloc(int);
void *__wrap_malloc(int size)
{
void *ret;
- if(!CAN_KMALLOC())
- return(__real_malloc(size));
- else if(size <= PAGE_SIZE) /* finding contiguos pages can be hard*/
- ret = um_kmalloc(size);
- else ret = um_vmalloc(size);
+ if (!kmalloc_ok)
+ return __real_malloc(size);
+ else if (size <= UM_KERN_PAGE_SIZE)
+ /* finding contiguous pages can be hard*/
+ ret = uml_kmalloc(size, UM_GFP_KERNEL);
+ else ret = vmalloc(size);
- /* glibc people insist that if malloc fails, errno should be
+ /*
+ * glibc people insist that if malloc fails, errno should be
* set by malloc as well. So we do.
*/
- if(ret == NULL)
+ if (ret == NULL)
errno = ENOMEM;
- return(ret);
+ return ret;
}
void *__wrap_calloc(int n, int size)
{
void *ptr = __wrap_malloc(n * size);
- if(ptr == NULL) return(NULL);
+ if (ptr == NULL)
+ return NULL;
memset(ptr, 0, n * size);
- return(ptr);
+ return ptr;
}
extern void __real_free(void *);
@@ -229,7 +235,8 @@ void __wrap_free(void *ptr)
{
unsigned long addr = (unsigned long) ptr;
- /* We need to know how the allocation happened, so it can be correctly
+ /*
+ * We need to know how the allocation happened, so it can be correctly
* freed. This is done by seeing what region of memory the pointer is
* in -
* physical memory - kmalloc/kfree
@@ -247,12 +254,12 @@ void __wrap_free(void *ptr)
* there is a possibility for memory leaks.
*/
- if((addr >= uml_physmem) && (addr < high_physmem)){
- if(CAN_KMALLOC())
+ if ((addr >= uml_physmem) && (addr < high_physmem)) {
+ if (kmalloc_ok)
kfree(ptr);
}
- else if((addr >= start_vm) && (addr < end_vm)){
- if(CAN_KMALLOC())
+ else if ((addr >= start_vm) && (addr < end_vm)) {
+ if (kmalloc_ok)
vfree(ptr);
}
else __real_free(ptr);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 17:24:27 +0000