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authorYang Zhang <yang.z.zhang@intel.com>2015-08-28 09:58:54 +0800
committerYang Zhang <yang.z.zhang@intel.com>2015-09-01 12:44:00 +0800
commite44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch)
tree66b09f592c55df2878107a468a91d21506104d3f /qemu/linux-user/linuxload.c
parent9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff)
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/linux-user/linuxload.c')
-rw-r--r--qemu/linux-user/linuxload.c180
1 files changed, 180 insertions, 0 deletions
diff --git a/qemu/linux-user/linuxload.c b/qemu/linux-user/linuxload.c
new file mode 100644
index 000000000..506e837ae
--- /dev/null
+++ b/qemu/linux-user/linuxload.c
@@ -0,0 +1,180 @@
+/* Code for loading Linux executables. Mostly linux kernel code. */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "qemu.h"
+
+#define NGROUPS 32
+
+/* ??? This should really be somewhere else. */
+abi_long memcpy_to_target(abi_ulong dest, const void *src,
+ unsigned long len)
+{
+ void *host_ptr;
+
+ host_ptr = lock_user(VERIFY_WRITE, dest, len, 0);
+ if (!host_ptr)
+ return -TARGET_EFAULT;
+ memcpy(host_ptr, src, len);
+ unlock_user(host_ptr, dest, 1);
+ return 0;
+}
+
+static int count(char ** vec)
+{
+ int i;
+
+ for(i = 0; *vec; i++) {
+ vec++;
+ }
+
+ return(i);
+}
+
+static int prepare_binprm(struct linux_binprm *bprm)
+{
+ struct stat st;
+ int mode;
+ int retval;
+
+ if(fstat(bprm->fd, &st) < 0) {
+ return(-errno);
+ }
+
+ mode = st.st_mode;
+ if(!S_ISREG(mode)) { /* Must be regular file */
+ return(-EACCES);
+ }
+ if(!(mode & 0111)) { /* Must have at least one execute bit set */
+ return(-EACCES);
+ }
+
+ bprm->e_uid = geteuid();
+ bprm->e_gid = getegid();
+
+ /* Set-uid? */
+ if(mode & S_ISUID) {
+ bprm->e_uid = st.st_uid;
+ }
+
+ /* Set-gid? */
+ /*
+ * If setgid is set but no group execute bit then this
+ * is a candidate for mandatory locking, not a setgid
+ * executable.
+ */
+ if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
+ bprm->e_gid = st.st_gid;
+ }
+
+ retval = read(bprm->fd, bprm->buf, BPRM_BUF_SIZE);
+ if (retval < 0) {
+ perror("prepare_binprm");
+ exit(-1);
+ }
+ if (retval < BPRM_BUF_SIZE) {
+ /* Make sure the rest of the loader won't read garbage. */
+ memset(bprm->buf + retval, 0, BPRM_BUF_SIZE - retval);
+ }
+ return retval;
+}
+
+/* Construct the envp and argv tables on the target stack. */
+abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
+ abi_ulong stringp, int push_ptr)
+{
+ TaskState *ts = (TaskState *)thread_cpu->opaque;
+ int n = sizeof(abi_ulong);
+ abi_ulong envp;
+ abi_ulong argv;
+
+ sp -= (envc + 1) * n;
+ envp = sp;
+ sp -= (argc + 1) * n;
+ argv = sp;
+ if (push_ptr) {
+ /* FIXME - handle put_user() failures */
+ sp -= n;
+ put_user_ual(envp, sp);
+ sp -= n;
+ put_user_ual(argv, sp);
+ }
+ sp -= n;
+ /* FIXME - handle put_user() failures */
+ put_user_ual(argc, sp);
+ ts->info->arg_start = stringp;
+ while (argc-- > 0) {
+ /* FIXME - handle put_user() failures */
+ put_user_ual(stringp, argv);
+ argv += n;
+ stringp += target_strlen(stringp) + 1;
+ }
+ ts->info->arg_end = stringp;
+ /* FIXME - handle put_user() failures */
+ put_user_ual(0, argv);
+ while (envc-- > 0) {
+ /* FIXME - handle put_user() failures */
+ put_user_ual(stringp, envp);
+ envp += n;
+ stringp += target_strlen(stringp) + 1;
+ }
+ /* FIXME - handle put_user() failures */
+ put_user_ual(0, envp);
+
+ return sp;
+}
+
+int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
+ struct target_pt_regs * regs, struct image_info *infop,
+ struct linux_binprm *bprm)
+{
+ int retval;
+ int i;
+
+ bprm->p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int);
+ memset(bprm->page, 0, sizeof(bprm->page));
+ bprm->fd = fdexec;
+ bprm->filename = (char *)filename;
+ bprm->argc = count(argv);
+ bprm->argv = argv;
+ bprm->envc = count(envp);
+ bprm->envp = envp;
+
+ retval = prepare_binprm(bprm);
+
+ if(retval>=0) {
+ if (bprm->buf[0] == 0x7f
+ && bprm->buf[1] == 'E'
+ && bprm->buf[2] == 'L'
+ && bprm->buf[3] == 'F') {
+ retval = load_elf_binary(bprm, infop);
+#if defined(TARGET_HAS_BFLT)
+ } else if (bprm->buf[0] == 'b'
+ && bprm->buf[1] == 'F'
+ && bprm->buf[2] == 'L'
+ && bprm->buf[3] == 'T') {
+ retval = load_flt_binary(bprm, infop);
+#endif
+ } else {
+ return -ENOEXEC;
+ }
+ }
+
+ if(retval>=0) {
+ /* success. Initialize important registers */
+ do_init_thread(regs, infop);
+ return retval;
+ }
+
+ /* Something went wrong, return the inode and free the argument pages*/
+ for (i=0 ; i<MAX_ARG_PAGES ; i++) {
+ g_free(bprm->page[i]);
+ }
+ return(retval);
+}