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/*
* Copyright (c) 2014, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <arm.h>
#include <assert.h>
#include <kernel/misc.h>
#include <kernel/thread.h>
#include <kernel/trace_ta.h>
#include <tee/tee_svc.h>
#include <tee/arch_svc.h>
#include <tee/tee_svc_cryp.h>
#include <tee/tee_svc_storage.h>
#include <tee/se/svc.h>
#include <tee/svc_cache.h>
#include <tee_syscall_numbers.h>
#include <trace.h>
#include <util.h>
#include "arch_svc_private.h"
#if (TRACE_LEVEL == TRACE_FLOW) && defined(CFG_TEE_CORE_TA_TRACE)
#define TRACE_SYSCALLS
#endif
struct syscall_entry {
syscall_t fn;
#ifdef TRACE_SYSCALLS
const char *name;
#endif
};
#ifdef TRACE_SYSCALLS
#define SYSCALL_ENTRY(_fn) { .fn = (syscall_t)_fn, .name = #_fn }
#else
#define SYSCALL_ENTRY(_fn) { .fn = (syscall_t)_fn }
#endif
/*
* This array is ordered according to the SYSCALL ids TEE_SCN_xxx
*/
static const struct syscall_entry tee_svc_syscall_table[] = {
SYSCALL_ENTRY(syscall_sys_return),
SYSCALL_ENTRY(syscall_log),
SYSCALL_ENTRY(syscall_panic),
SYSCALL_ENTRY(syscall_get_property),
SYSCALL_ENTRY(syscall_get_property_name_to_index),
SYSCALL_ENTRY(syscall_open_ta_session),
SYSCALL_ENTRY(syscall_close_ta_session),
SYSCALL_ENTRY(syscall_invoke_ta_command),
SYSCALL_ENTRY(syscall_check_access_rights),
SYSCALL_ENTRY(syscall_get_cancellation_flag),
SYSCALL_ENTRY(syscall_unmask_cancellation),
SYSCALL_ENTRY(syscall_mask_cancellation),
SYSCALL_ENTRY(syscall_wait),
SYSCALL_ENTRY(syscall_get_time),
SYSCALL_ENTRY(syscall_set_ta_time),
SYSCALL_ENTRY(syscall_cryp_state_alloc),
SYSCALL_ENTRY(syscall_cryp_state_copy),
SYSCALL_ENTRY(syscall_cryp_state_free),
SYSCALL_ENTRY(syscall_hash_init),
SYSCALL_ENTRY(syscall_hash_update),
SYSCALL_ENTRY(syscall_hash_final),
SYSCALL_ENTRY(syscall_cipher_init),
SYSCALL_ENTRY(syscall_cipher_update),
SYSCALL_ENTRY(syscall_cipher_final),
SYSCALL_ENTRY(syscall_cryp_obj_get_info),
SYSCALL_ENTRY(syscall_cryp_obj_restrict_usage),
SYSCALL_ENTRY(syscall_cryp_obj_get_attr),
SYSCALL_ENTRY(syscall_cryp_obj_alloc),
SYSCALL_ENTRY(syscall_cryp_obj_close),
SYSCALL_ENTRY(syscall_cryp_obj_reset),
SYSCALL_ENTRY(syscall_cryp_obj_populate),
SYSCALL_ENTRY(syscall_cryp_obj_copy),
SYSCALL_ENTRY(syscall_cryp_derive_key),
SYSCALL_ENTRY(syscall_cryp_random_number_generate),
SYSCALL_ENTRY(syscall_authenc_init),
SYSCALL_ENTRY(syscall_authenc_update_aad),
SYSCALL_ENTRY(syscall_authenc_update_payload),
SYSCALL_ENTRY(syscall_authenc_enc_final),
SYSCALL_ENTRY(syscall_authenc_dec_final),
SYSCALL_ENTRY(syscall_asymm_operate),
SYSCALL_ENTRY(syscall_asymm_verify),
SYSCALL_ENTRY(syscall_storage_obj_open),
SYSCALL_ENTRY(syscall_storage_obj_create),
SYSCALL_ENTRY(syscall_storage_obj_del),
SYSCALL_ENTRY(syscall_storage_obj_rename),
SYSCALL_ENTRY(syscall_storage_alloc_enum),
SYSCALL_ENTRY(syscall_storage_free_enum),
SYSCALL_ENTRY(syscall_storage_reset_enum),
SYSCALL_ENTRY(syscall_storage_start_enum),
SYSCALL_ENTRY(syscall_storage_next_enum),
SYSCALL_ENTRY(syscall_storage_obj_read),
SYSCALL_ENTRY(syscall_storage_obj_write),
SYSCALL_ENTRY(syscall_storage_obj_trunc),
SYSCALL_ENTRY(syscall_storage_obj_seek),
SYSCALL_ENTRY(syscall_obj_generate_key),
SYSCALL_ENTRY(syscall_se_service_open),
SYSCALL_ENTRY(syscall_se_service_close),
SYSCALL_ENTRY(syscall_se_service_get_readers),
SYSCALL_ENTRY(syscall_se_reader_get_prop),
SYSCALL_ENTRY(syscall_se_reader_get_name),
SYSCALL_ENTRY(syscall_se_reader_open_session),
SYSCALL_ENTRY(syscall_se_reader_close_sessions),
SYSCALL_ENTRY(syscall_se_session_is_closed),
SYSCALL_ENTRY(syscall_se_session_get_atr),
SYSCALL_ENTRY(syscall_se_session_open_channel),
SYSCALL_ENTRY(syscall_se_session_close),
SYSCALL_ENTRY(syscall_se_channel_select_next),
SYSCALL_ENTRY(syscall_se_channel_get_select_resp),
SYSCALL_ENTRY(syscall_se_channel_transmit),
SYSCALL_ENTRY(syscall_se_channel_close),
SYSCALL_ENTRY(syscall_cache_operation),
};
#ifdef TRACE_SYSCALLS
static void trace_syscall(size_t num)
{
if (num == TEE_SCN_RETURN || num > TEE_SCN_MAX)
return;
FMSG("syscall #%zu (%s)", num, tee_svc_syscall_table[num].name);
}
#else
static void trace_syscall(size_t num __unused)
{
}
#endif
#ifdef ARM32
static void get_scn_max_args(struct thread_svc_regs *regs, size_t *scn,
size_t *max_args)
{
*scn = regs->r7;
*max_args = regs->r6;
}
#endif /*ARM32*/
#ifdef ARM64
static void get_scn_max_args(struct thread_svc_regs *regs, size_t *scn,
size_t *max_args)
{
if (((regs->spsr >> SPSR_MODE_RW_SHIFT) & SPSR_MODE_RW_MASK) ==
SPSR_MODE_RW_32) {
*scn = regs->x7;
*max_args = regs->x6;
} else {
*scn = regs->x8;
*max_args = 0;
}
}
#endif /*ARM64*/
#ifdef ARM32
static void set_svc_retval(struct thread_svc_regs *regs, uint32_t ret_val)
{
regs->r0 = ret_val;
}
#endif /*ARM32*/
#ifdef ARM64
static void set_svc_retval(struct thread_svc_regs *regs, uint64_t ret_val)
{
regs->x0 = ret_val;
}
#endif /*ARM64*/
void tee_svc_handler(struct thread_svc_regs *regs)
{
size_t scn;
size_t max_args;
syscall_t scf;
COMPILE_TIME_ASSERT(ARRAY_SIZE(tee_svc_syscall_table) ==
(TEE_SCN_MAX + 1));
thread_user_save_vfp();
/* TA has just entered kernel mode */
tee_ta_update_session_utime_suspend();
/* Restore foreign interrupts which are disabled on exception entry */
thread_restore_foreign_intr();
get_scn_max_args(regs, &scn, &max_args);
trace_syscall(scn);
if (max_args > TEE_SVC_MAX_ARGS) {
DMSG("Too many arguments for SCN %zu (%zu)", scn, max_args);
set_svc_retval(regs, TEE_ERROR_GENERIC);
return;
}
if (scn > TEE_SCN_MAX)
scf = syscall_not_supported;
else
scf = tee_svc_syscall_table[scn].fn;
set_svc_retval(regs, tee_svc_do_call(regs, scf));
if (scn != TEE_SCN_RETURN) {
/* We're about to switch back to user mode */
tee_ta_update_session_utime_resume();
}
}
#ifdef ARM32
uint32_t tee_svc_sys_return_helper(uint32_t ret, bool panic,
uint32_t panic_code, struct thread_svc_regs *regs)
{
if (panic) {
TAMSG("TA panicked with code 0x%x usr_sp 0x%x usr_lr 0x%x",
panic_code, read_mode_sp(CPSR_MODE_SYS),
read_mode_lr(CPSR_MODE_SYS));
}
regs->r1 = panic;
regs->r2 = panic_code;
regs->lr = (uintptr_t)thread_unwind_user_mode;
regs->spsr = read_cpsr();
return ret;
}
#endif /*ARM32*/
#ifdef ARM64
uint32_t tee_svc_sys_return_helper(uint32_t ret, bool panic,
uint32_t panic_code, struct thread_svc_regs *regs)
{
if (panic) {
TAMSG("TA panicked with code 0x%x usr_sp 0x%" PRIx64 " usr_lr 0x%" PRIx64,
panic_code, regs->x13, regs->x14);
}
regs->x1 = panic;
regs->x2 = panic_code;
regs->elr = (uintptr_t)thread_unwind_user_mode;
regs->spsr = SPSR_64(SPSR_64_MODE_EL1, SPSR_64_MODE_SP_EL0, 0);
regs->spsr |= read_daif();
/*
* Regs is the value of stack pointer before calling the SVC
* handler. By the addition matches for the reserved space at the
* beginning of el0_sync_svc(). This prepares the stack when
* returning to thread_unwind_user_mode instead of a normal
* exception return.
*/
regs->sp_el0 = (uint64_t)(regs + 1);
return ret;
}
#endif /*ARM64*/
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