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[PATCH] uml: add skas0 command-line option

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This adds the "skas0" parameter to force skas0 operation on SKAS3 host and
shows which operating mode has been selected.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2005-07-27 11:43:31 -07:00 committed by Linus Torvalds
parent b6b038a24a
commit cb66504d65
2 changed files with 44 additions and 10 deletions
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31
arch/um/kernel/process.c
View file

@ -212,12 +212,26 @@ static int stop_ptraced_child(int pid, int exitcode, int mustexit)
static int force_sysemu_disabled = 0;
int ptrace_faultinfo = 1;
int proc_mm = 1;
static int __init skas0_cmd_param(char *str, int* add)
{
ptrace_faultinfo = proc_mm = 0;
return 0;
}
static int __init nosysemu_cmd_param(char *str, int* add)
{
force_sysemu_disabled = 1;
return 0;
}
__uml_setup("skas0", skas0_cmd_param,
"skas0\n"
" Disables SKAS3 usage, so that SKAS0 is used, unless you \n"
" specify mode=tt.\n\n");
__uml_setup("nosysemu", nosysemu_cmd_param,
"nosysemu\n"
" Turns off syscall emulation patch for ptrace (SYSEMU) on.\n"
@ -359,12 +373,10 @@ void forward_pending_sigio(int target)
kill(target, SIGIO);
}
int ptrace_faultinfo = 0;
int proc_mm = 1;
extern void *__syscall_stub_start, __syscall_stub_end;
#ifdef UML_CONFIG_MODE_SKAS
static inline void check_skas3_ptrace_support(void)
{
struct ptrace_faultinfo fi;
@ -375,6 +387,7 @@ static inline void check_skas3_ptrace_support(void)
n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
if (n < 0) {
ptrace_faultinfo = 0;
if(errno == EIO)
printf("not found\n");
else {
@ -382,7 +395,9 @@ static inline void check_skas3_ptrace_support(void)
}
}
else {
ptrace_faultinfo = 1;
if (!ptrace_faultinfo)
printf("found but disabled on command line\n");
else
printf("found\n");
}
@ -396,13 +411,13 @@ int can_do_skas(void)
if (os_access("/proc/mm", OS_ACC_W_OK) < 0) {
proc_mm = 0;
printf("not found\n");
goto out;
}
else {
} else {
if (!proc_mm)
printf("found but disabled on command line\n");
else
printf("found\n");
}
out:
check_skas3_ptrace_support();
return 1;
}

19
arch/um/kernel/um_arch.c
View file

@ -38,6 +38,9 @@
#include "choose-mode.h"
#include "mode_kern.h"
#include "mode.h"
#ifdef UML_CONFIG_MODE_SKAS
#include "skas.h"
#endif
#define DEFAULT_COMMAND_LINE "root=98:0"
@ -318,6 +321,7 @@ int linux_main(int argc, char **argv)
unsigned long avail, diff;
unsigned long virtmem_size, max_physmem;
unsigned int i, add;
char * mode;
for (i = 1; i < argc; i++){
if((i == 1) && (argv[i][0] == ' ')) continue;
@ -338,6 +342,21 @@ int linux_main(int argc, char **argv)
exit(1);
}
#endif
#ifndef CONFIG_MODE_SKAS
mode = "TT";
#else
/* Show to the user the result of selection */
if (mode_tt)
mode = "TT";
else if (proc_mm && ptrace_faultinfo)
mode = "SKAS3";
else
mode = "SKAS0";
#endif
printf("UML running in %s mode\n", mode);
uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
&host_task_size, &task_size);