diff options
Diffstat (limited to 'linux-user/main.c')
| -rw-r--r-- | linux-user/main.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/linux-user/main.c b/linux-user/main.c index 9038b58e7e..4388c04c9a 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -39,6 +39,11 @@ char *exec_path; int singlestep; +#if defined(CONFIG_USE_GUEST_BASE) +unsigned long mmap_min_addr; +unsigned long guest_base; +int have_guest_base; +#endif static const char *interp_prefix = CONFIG_QEMU_PREFIX; const char *qemu_uname_release = CONFIG_UNAME_RELEASE; @@ -2320,6 +2325,9 @@ static void usage(void) "-E var=value sets/modifies targets environment variable(s)\n" "-U var unsets targets environment variable(s)\n" "-0 argv0 forces target process argv[0] to be argv0\n" +#if defined(CONFIG_USE_GUEST_BASE) + "-B address set guest_base address to address\n" +#endif "\n" "Debug options:\n" "-d options activate log (logfile=%s)\n" @@ -2495,6 +2503,11 @@ int main(int argc, char **argv, char **envp) #endif exit(1); } +#if defined(CONFIG_USE_GUEST_BASE) + } else if (!strcmp(r, "B")) { + guest_base = strtol(argv[optind++], NULL, 0); + have_guest_base = 1; +#endif } else if (!strcmp(r, "drop-ld-preload")) { (void) envlist_unsetenv(envlist, "LD_PRELOAD"); } else if (!strcmp(r, "singlestep")) { @@ -2572,6 +2585,35 @@ int main(int argc, char **argv, char **envp) target_environ = envlist_to_environ(envlist, NULL); envlist_free(envlist); +#if defined(CONFIG_USE_GUEST_BASE) + /* + * Now that page sizes are configured in cpu_init() we can do + * proper page alignment for guest_base. + */ + guest_base = HOST_PAGE_ALIGN(guest_base); + + /* + * Read in mmap_min_addr kernel parameter. This value is used + * When loading the ELF image to determine whether guest_base + * is needed. + * + * When user has explicitly set the quest base, we skip this + * test. + */ + if (!have_guest_base) { + FILE *fp; + + if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) { + unsigned long tmp; + if (fscanf(fp, "%lu", &tmp) == 1) { + mmap_min_addr = tmp; + qemu_log("host mmap_min_addr=0x%lx\n", mmap_min_addr); + } + fclose(fp); + } + } +#endif /* CONFIG_USE_GUEST_BASE */ + /* * Prepare copy of argv vector for target. */ @@ -2622,6 +2664,9 @@ int main(int argc, char **argv, char **envp) free(target_environ); if (qemu_log_enabled()) { +#if defined(CONFIG_USE_GUEST_BASE) + qemu_log("guest_base 0x%lx\n", guest_base); +#endif log_page_dump(); qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk); |