OmniNX/Atmosphere
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fusee/exo: add ability to disable user exception handlers

Browse Source 
please do not use this
yellows8 needs it to debug am, 99% of use cases want them on
This commit is contained in:
Michael Scire
2019-05-10 03:50:25 -07:00
parent 03a425a579
commit bb6cc6532b
8 changed files with 45 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
exosphere/src/configitem.c
View File

@@ -37,6 +37,7 @@
static bool g_hiz_mode_enabled = false;
static bool g_debugmode_override_user = false, g_debugmode_override_priv = false;
static bool g_enable_usermode_exception_handlers = true;
uint32_t configitem_set(bool privileged, ConfigItem item, uint64_t value) {
switch (item) {
@@ -163,6 +164,10 @@ void configitem_set_debugmode_override(bool user, bool priv) {
g_debugmode_override_priv = priv;
}
void configitem_disable_usermode_exception_handlers(void) {
g_enable_usermode_exception_handlers = false;
}
uint32_t configitem_get(bool privileged, ConfigItem item, uint64_t *p_outvalue) {
uint32_t result = 0;
switch (item) {
@@ -213,8 +218,10 @@ uint32_t configitem_get(bool privileged, ConfigItem item, uint64_t *p_outvalue)
case CONFIGITEM_KERNELCONFIGURATION:
{
uint64_t config = bootconfig_get_kernel_configuration();
/* Always enable usermode exception handlers. */
config |= KERNELCONFIGFLAG_ENABLE_USER_EXCEPTION_HANDLERS;
/* Enable usermode exception handlers by default. */
if (g_enable_usermode_exception_handlers) {
config |= KERNELCONFIGFLAG_ENABLE_USER_EXCEPTION_HANDLERS;
}
*p_outvalue = config;
}
break;

1
exosphere/src/configitem.h
View File

@@ -60,6 +60,7 @@ bool configitem_is_hiz_mode_enabled(void);
bool configitem_is_debugmode_priv(void);
void configitem_set_debugmode_override(bool user, bool priv);
void configitem_disable_usermode_exception_handlers(void);
void configitem_set_hiz_mode_enabled(bool enabled);
uint64_t configitem_get_hardware_type(void);

8
exosphere/src/exocfg.c
View File

@@ -75,3 +75,11 @@ unsigned int exosphere_should_override_debugmode_user(void) {
return EXOSPHERE_CHECK_FLAG(EXOSPHERE_FLAG_IS_DEBUGMODE_USER);
}
unsigned int exosphere_should_disable_usermode_exception_handlers(void) {
if (!g_has_loaded_config) {
generic_panic();
}
return EXOSPHERE_CHECK_FLAG(EXOSPHERE_FLAG_DISABLE_USERMODE_EXCEPTION_HANDLERS);
}

10
exosphere/src/exocfg.h
View File

@@ -35,10 +35,11 @@
/* Exosphere config in DRAM shares physical/virtual mapping. */
#define MAILBOX_EXOSPHERE_CONFIG_PHYS MAILBOX_EXOSPHERE_CONFIG
#define EXOSPHERE_FLAGS_DEFAULT 0x00000000
#define EXOSPHERE_FLAG_PERFORM_620_KEYGEN (1 << 0u)
#define EXOSPHERE_FLAG_IS_DEBUGMODE_PRIV (1 << 1u)
#define EXOSPHERE_FLAG_IS_DEBUGMODE_USER (1 << 2u)
#define EXOSPHERE_FLAG_PERFORM_620_KEYGEN (1 << 0u)
#define EXOSPHERE_FLAG_IS_DEBUGMODE_PRIV (1 << 1u)
#define EXOSPHERE_FLAG_IS_DEBUGMODE_USER (1 << 2u)
#define EXOSPHERE_FLAG_DISABLE_USERMODE_EXCEPTION_HANDLERS (1 << 3u)
#define EXOSPHERE_FLAGS_DEFAULT (EXOSPHERE_FLAG_IS_DEBUGMODE_PRIV)
typedef struct {
unsigned int magic;
@@ -52,6 +53,7 @@ unsigned int exosphere_get_target_firmware(void);
unsigned int exosphere_should_perform_620_keygen(void);
unsigned int exosphere_should_override_debugmode_priv(void);
unsigned int exosphere_should_override_debugmode_user(void);
unsigned int exosphere_should_disable_usermode_exception_handlers(void);
static inline unsigned int exosphere_get_target_firmware_for_init(void) {
const unsigned int magic = MAILBOX_EXOSPHERE_CONFIG_PHYS.magic;

3
exosphere/src/package2.c
View File

@@ -538,6 +538,9 @@ void load_package2(coldboot_crt0_reloc_list_t *reloc_list) {
/* Load Exosphere-specific config. */
exosphere_load_config();
configitem_set_debugmode_override(exosphere_should_override_debugmode_user() != 0, exosphere_should_override_debugmode_priv() != 0);
if (exosphere_should_disable_usermode_exception_handlers() != 0) {
configitem_disable_usermode_exception_handlers();
}
/* Setup the Security Engine. */
setup_se();