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add a platform independent function to manage the TLS

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This commit is contained in:
Stefan Lankes 2015-12-30 09:51:03 +01:00
parent e666d91a5b
commit a8661c1fb8
3 changed files with 28 additions and 2 deletions
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18
hermit/arch/x86/include/asm/processor.h
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@ -477,6 +477,24 @@ extern func_read_fsgs readgs;
extern func_write_fsgs writefs;
extern func_write_fsgs writegs;
/** @brife Get thread local storage
*
* Helper function to get the TLS of the current task
*/
static inline size_t get_tls(void)
{
return readfs();
}
/** @brief Set thread local storage
*
* Helper function to set the TLS of the current task
*/
static inline void set_tls(size_t addr)
{
writefs(addr);
}
/** @brief Flush cache
*
* The wbinvd asm instruction which stands for "Write back and invalidate"

4
hermit/kernel/main.c
View file

@ -290,9 +290,9 @@ static int initd(void* arg)
memcpy((void*) tls_addr, (void*) curr_task->tls_addr, curr_task->tls_size);
// set fs register to the TLS segment
writefs((size_t) tls_addr);
set_tls((size_t) tls_addr);
kprintf("Task %d set fs to 0x%zx\n", curr_task->id, tls_addr);
} else writefs(0); // no TLS => clear fs register
} else set_tls(0); // no TLS => clear fs register
//init_rcce();

8
hermit/kernel/tasks.c
View file

@ -222,6 +222,7 @@ void finish_task_switch(void)
void NORETURN do_exit(int arg)
{
task_t* curr_task = per_core(current_task);
void* tls_addr = NULL;
const uint32_t core_id = CORE_ID;
kprintf("Terminate task: %u, return value %d\n", curr_task->id, arg);
@ -237,6 +238,13 @@ void NORETURN do_exit(int arg)
readyqueues[core_id].nr_tasks--;
spinlock_irqsave_unlock(&readyqueues[core_id].lock);
// do we need to release the TLS?
tls_addr = (void*)get_tls();
if (tls_addr) {
kprintf("Release TLS %p\n", tls_addr);
kfree(tls_addr);
}
curr_task->status = TASK_FINISHED;
reschedule();