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Code Issues Releases Activity

Fix lock_try_acquire(&g_is_user_smc_in_progress) calls

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This commit is contained in:
TuxSH 2018-03-05 21:07:09 +01:00
parent 6b10c21a10
commit 827280ca12
3 changed files with 8 additions and 4 deletions
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9
exosphere/src/smc_api.c
View file

@ -129,6 +129,9 @@ uintptr_t get_exception_entry_stack_address(unsigned int core_id) {
}
}
bool try_set_user_smc_in_progress(void) {
return lock_try_acquire(&g_is_user_smc_in_progress);
}
void set_user_smc_in_progress(void) {
lock_acquire(&g_is_user_smc_in_progress);
}
@ -203,7 +206,7 @@ void call_smc_handler(uint32_t handler_id, smc_args_t *args) {
uint32_t smc_wrapper_sync(smc_args_t *args, uint32_t (*handler)(smc_args_t *)) {
uint32_t result;
if (!lock_try_acquire(&g_is_user_smc_in_progress)) {
if (!try_set_user_smc_in_progress()) {
return 3;
}
result = handler(args);
@ -214,7 +217,7 @@ uint32_t smc_wrapper_sync(smc_args_t *args, uint32_t (*handler)(smc_args_t *)) {
uint32_t smc_wrapper_async(smc_args_t *args, uint32_t (*handler)(smc_args_t *), uint32_t (*callback)(void *, uint64_t)) {
uint32_t result;
uint64_t key;
if (!lock_try_acquire(&g_is_user_smc_in_progress)) {
if (!try_set_user_smc_in_progress()) {
return 3;
}
if ((key = try_set_smc_callback(callback)) != 0) {
@ -439,7 +442,7 @@ uint32_t smc_get_random_bytes_for_priv(smc_args_t *args) {
uint32_t result;
if (!lock_try_acquire(&g_is_user_smc_in_progress)) {
if (!try_set_user_smc_in_progress()) {
if (args->X[1] > 0x38) {
return 2;
}

1
exosphere/src/smc_api.h
View file

@ -10,6 +10,7 @@ typedef struct {
uint64_t X[8];
} smc_args_t;
bool try_set_user_smc_in_progress(void);
void set_user_smc_in_progress(void);
void clear_user_smc_in_progress(void);

2
exosphere/src/synchronization.h
View file

@ -55,7 +55,7 @@ static inline void lock_release(atomic_flag *flag) {
/* Try to acquire a lock. */
static inline bool lock_try_acquire(atomic_flag *flag) {
return atomic_flag_test_and_set_explicit(flag, memory_order_acquire);
return !atomic_flag_test_and_set_explicit(flag, memory_order_acquire);
}
/*