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SMCCC: Hoist SMC_32 sanitization

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The SMCCC, part 3 indicates that only the bottom
32-bits of a 32-bit SMC call are valid. The upper
bits must be zero. Lets enforce that so standard
service code can assume its been called that way.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Change-Id: I1bac50fbdc3b6ddca5fe2d1d1f96166a65ac4eb4
This commit is contained in:
Jeremy Linton 2021-04-01 13:10:24 -05:00 • committed by Manish Pandey
parent 09e153a9a8
commit 475333c8a9
1 changed files with 9 additions and 0 deletions
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9
services/std_svc/std_svc_setup.c
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@ -82,6 +82,15 @@ static uintptr_t std_svc_smc_handler(uint32_t smc_fid,
void *handle, void *handle,
u_register_t flags) u_register_t flags)
{ {
if (((smc_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_32) {
/* 32-bit SMC function, clear top parameter bits */
x1 &= UINT32_MAX;
x2 &= UINT32_MAX;
x3 &= UINT32_MAX;
x4 &= UINT32_MAX;
}
/* /*
* Dispatch PSCI calls to PSCI SMC handler and return its return * Dispatch PSCI calls to PSCI SMC handler and return its return
* value * value