When ripping out Qualcomm's EL2 on the x13s, calls into the Secure Monitor

make the machine crash.  As it turns out the SMC calling convention specifies
that further registers up to and including x18 might need to be caller-saved,
which we seem to have to follow now.

ok kettenis@

diff --git a/sys/dev/fdt/qcscm.c b/sys/dev/fdt/qcscm.c
index 1e39742..93ed4cd 100644 (file)
--- a/sys/dev/fdt/qcscm.c
+++ b/sys/dev/fdt/qcscm.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: qcscm.c,v 1.5 2023/07/22 22:48:35 patrick Exp $ */
+/* $OpenBSD: qcscm.c,v 1.6 2024/06/23 22:04:53 patrick Exp $ */
 /*
  * Copyright (c) 2022 Patrick Wildt <patrick@blueri.se>
  *
@@ -204,14 +204,25 @@ qcscm_smc_exec(uint64_t *in, uint64_t *out)
            "ldp x2, x3, [%0, #16]\n"
            "ldp x4, x5, [%0, #32]\n"
            "ldp x6, x7, [%0, #48]\n"
+           "ldp x8, x9, [%0, #64]\n"
+           "ldp x10, x11, [%0, #80]\n"
+           "ldp x12, x13, [%0, #96]\n"
+           "ldp x14, x15, [%0, #112]\n"
+           "ldp x16, x17, [%0, #128]\n"
            "smc #0\n"
            "stp x0, x1, [%1, #0]\n"
            "stp x2, x3, [%1, #16]\n"
            "stp x4, x5, [%1, #32]\n"
-           "stp x6, x7, [%1, #48]\n" ::
+           "stp x6, x7, [%1, #48]\n"
+           "stp x8, x9, [%1, #64]\n"
+           "stp x10, x11, [%1, #80]\n"
+           "stp x12, x13, [%1, #96]\n"
+           "stp x14, x15, [%1, #112]\n"
+           "stp x16, x17, [%1, #128]\n" ::
            "r" (in), "r" (out) :
-           "x0", "x1", "x2", "x3",
-           "x4", "x5", "x6", "x7",
+           "x0", "x1", "x2", "x3", "x4", "x5",
+           "x6", "x7", "x8", "x9", "x10", "x11",
+           "x12", "x13", "x14", "x15", "x16", "x17",
            "memory");
 }
 
@@ -219,7 +230,7 @@ int
 qcscm_smc_call(struct qcscm_softc *sc, uint8_t owner, uint8_t svc, uint8_t cmd,
     uint32_t arginfo, uint64_t *args, int arglen, uint64_t *res)
 {
-       uint64_t smcreq[8] = { 0 }, smcres[8] = { 0 };
+       uint64_t smcreq[18] = { 0 }, smcres[18] = { 0 };
        uint64_t *smcextreq;
        int i;