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Outline user<->secure page copying.

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This commit is contained in:
Michael Scire 2018-02-19 20:18:53 -08:00
parent a01d2c92b2
commit ff07451280
3 changed files with 99 additions and 1 deletions
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16
exosphere/smc_api.c
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@ -6,6 +6,7 @@
#include "smc_api.h"
#include "smc_user.h"
#include "se.h"
#include "userpage.h"
#define SMC_USER_HANDLERS 0x13
#define SMC_PRIV_HANDLERS 0x9
@ -225,6 +226,10 @@ uint32_t smc_check_status(smc_args_t *args) {
uint32_t smc_get_result(smc_args_t *) {
uint32_t status;
unsigned char result_buf[0x400];
upage_ref_t page_ref;
void *user_address = (void *)args->X[2];
if (g_smc_callback_key == 0) {
return 4;
}
@ -241,7 +246,16 @@ uint32_t smc_get_result(smc_args_t *) {
args->X[1] = g_smc_callback(result_buf, args->X[3]);
g_smc_callback_key = 0;
/* TODO: Copy result from result_buf into output in args->X[2] */
/* Initialize page reference. */
if (upage_init(&page_ref, user_address) == 0) {
return 2;
}
/* Copy result output back to user. */
if (secure_copy_to_user(&page_ref, user_address, result_buf, (size_t)args->X[3]) == 0) {
return 2;
}
return 0;
}