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Merge "fix(rmmd): preserve x4-x7 as per SMCCCv1.1" into integration

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Soby Mathew 2021-11-24 18:49:18 +01:00 • committed by TrustedFirmware Code Review
commit 2845a68703
1 changed files with 20 additions and 14 deletions
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34
services/std_svc/rmmd/rmmd_main.c
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@ -48,10 +48,6 @@ static entry_point_info_t *rmm_ep_info;
* Static function declaration.
******************************************************************************/
static int32_t rmm_init(void);
static uint64_t rmmd_smc_forward(uint32_t smc_fid, uint32_t src_sec_state,
uint32_t dst_sec_state, uint64_t x1,
uint64_t x2, uint64_t x3, uint64_t x4,
void *handle);
/*******************************************************************************
* This function takes an RMM context pointer and performs a synchronous entry
@ -191,10 +187,10 @@ int rmmd_setup(void)
/*******************************************************************************
* Forward SMC to the other security state
******************************************************************************/
static uint64_t rmmd_smc_forward(uint32_t smc_fid, uint32_t src_sec_state,
uint32_t dst_sec_state, uint64_t x1,
uint64_t x2, uint64_t x3, uint64_t x4,
void *handle)
static uint64_t rmmd_smc_forward(uint32_t src_sec_state,
uint32_t dst_sec_state, uint64_t x0,
uint64_t x1, uint64_t x2, uint64_t x3,
uint64_t x4, void *handle)
{
/* Save incoming security state */
cm_el1_sysregs_context_save(src_sec_state);
@ -205,10 +201,20 @@ static uint64_t rmmd_smc_forward(uint32_t smc_fid, uint32_t src_sec_state,
cm_el2_sysregs_context_restore(dst_sec_state);
cm_set_next_eret_context(dst_sec_state);
SMC_RET8(cm_get_context(dst_sec_state), smc_fid, x1, x2, x3, x4,
SMC_GET_GP(handle, CTX_GPREG_X5),
SMC_GET_GP(handle, CTX_GPREG_X6),
SMC_GET_GP(handle, CTX_GPREG_X7));
/*
* As per SMCCCv1.1, we need to preserve x4 to x7 unless
* being used as return args. Hence we differentiate the
* onward and backward path. Support upto 8 args in the
* onward path and 4 args in return path.
*/
if (src_sec_state == NON_SECURE) {
SMC_RET8(cm_get_context(dst_sec_state), x0, x1, x2, x3, x4,
SMC_GET_GP(handle, CTX_GPREG_X5),
SMC_GET_GP(handle, CTX_GPREG_X6),
SMC_GET_GP(handle, CTX_GPREG_X7));
} else {
SMC_RET4(cm_get_context(dst_sec_state), x0, x1, x2, x3);
}
}
/*******************************************************************************
@ -237,7 +243,7 @@ uint64_t rmmd_rmi_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
*/
if (src_sec_state == SMC_FROM_NON_SECURE) {
VERBOSE("RMM: RMI call from non-secure world.\n");
return rmmd_smc_forward(smc_fid, NON_SECURE, REALM,
return rmmd_smc_forward(NON_SECURE, REALM, smc_fid,
x1, x2, x3, x4, handle);
}
@ -250,7 +256,7 @@ uint64_t rmmd_rmi_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
rmmd_rmm_sync_exit(x1);
}
return rmmd_smc_forward(x1, REALM, NON_SECURE,
return rmmd_smc_forward(REALM, NON_SECURE, x1,
x2, x3, x4, 0, handle);
default: