selftests/rseq: Fix ppc32: wrong rseq_cs 32-bit field pointer on big endian

commit 24d1136a29da5953de5c0cbc6c83eb62a1e0bf14 upstream.

ppc32 incorrectly uses padding as rseq_cs pointer field. Fix this by
using the rseq_cs.arch.ptr field.

Use this field across all architectures.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220124171253.22072-9-mathieu.desnoyers@efficios.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/tools/testing/selftests/rseq/rseq-arm.h b/tools/testing/selftests/rseq/rseq-arm.h
index 6716540..5f567b3 100644 (file)
--- a/tools/testing/selftests/rseq/rseq-arm.h
+++ b/tools/testing/selftests/rseq/rseq-arm.h
@@ -186,7 +186,7 @@ int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),
                  [newv]                "r" (newv)
@@ -256,7 +256,7 @@ int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expectnot]           "r" (expectnot),
@@ -317,7 +317,7 @@ int rseq_addv(intptr_t *v, intptr_t count, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "m" (*v),
                  [count]               "Ir" (count)
                  RSEQ_INJECT_INPUT
@@ -382,7 +382,7 @@ int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* try store input */
                  [v2]                  "m" (*v2),
                  [newv2]               "r" (newv2),
@@ -458,7 +458,7 @@ int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* try store input */
                  [v2]                  "m" (*v2),
                  [newv2]               "r" (newv2),
@@ -538,7 +538,7 @@ int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* cmp2 input */
                  [v2]                  "m" (*v2),
                  [expect2]             "r" (expect2),
@@ -658,7 +658,7 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),
@@ -783,7 +783,7 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),

diff --git a/tools/testing/selftests/rseq/rseq-arm64.h b/tools/testing/selftests/rseq/rseq-arm64.h
index b9d9b3a..d0f2b7f 100644 (file)
--- a/tools/testing/selftests/rseq/rseq-arm64.h
+++ b/tools/testing/selftests/rseq/rseq-arm64.h
@@ -231,7 +231,7 @@ int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "Qo" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "Qo" (*v),
                  [expect]              "r" (expect),
                  [newv]                "r" (newv)
@@ -288,7 +288,7 @@ int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "Qo" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "Qo" (*v),
                  [expectnot]           "r" (expectnot),
                  [load]                "Qo" (*load),
@@ -338,7 +338,7 @@ int rseq_addv(intptr_t *v, intptr_t count, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "Qo" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "Qo" (*v),
                  [count]               "r" (count)
                  RSEQ_INJECT_INPUT
@@ -389,7 +389,7 @@ int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "Qo" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [expect]              "r" (expect),
                  [v]                   "Qo" (*v),
                  [newv]                "r" (newv),
@@ -448,7 +448,7 @@ int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "Qo" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [expect]              "r" (expect),
                  [v]                   "Qo" (*v),
                  [newv]                "r" (newv),
@@ -509,7 +509,7 @@ int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "Qo" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "Qo" (*v),
                  [expect]              "r" (expect),
                  [v2]                  "Qo" (*v2),
@@ -570,7 +570,7 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "Qo" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [expect]              "r" (expect),
                  [v]                   "Qo" (*v),
                  [newv]                "r" (newv),
@@ -630,7 +630,7 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "Qo" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [expect]              "r" (expect),
                  [v]                   "Qo" (*v),
                  [newv]                "r" (newv),

diff --git a/tools/testing/selftests/rseq/rseq-mips.h b/tools/testing/selftests/rseq/rseq-mips.h
index 2b1f5bd..6df5427 100644 (file)
--- a/tools/testing/selftests/rseq/rseq-mips.h
+++ b/tools/testing/selftests/rseq/rseq-mips.h
@@ -191,7 +191,7 @@ int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),
                  [newv]                "r" (newv)
@@ -259,7 +259,7 @@ int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expectnot]           "r" (expectnot),
@@ -320,7 +320,7 @@ int rseq_addv(intptr_t *v, intptr_t count, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "m" (*v),
                  [count]               "Ir" (count)
                  RSEQ_INJECT_INPUT
@@ -383,7 +383,7 @@ int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* try store input */
                  [v2]                  "m" (*v2),
                  [newv2]               "r" (newv2),
@@ -457,7 +457,7 @@ int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* try store input */
                  [v2]                  "m" (*v2),
                  [newv2]               "r" (newv2),
@@ -533,7 +533,7 @@ int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* cmp2 input */
                  [v2]                  "m" (*v2),
                  [expect2]             "r" (expect2),
@@ -650,7 +650,7 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),
@@ -772,7 +772,7 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),

diff --git a/tools/testing/selftests/rseq/rseq-ppc.h b/tools/testing/selftests/rseq/rseq-ppc.h
index 2e6b757..c4ba137 100644 (file)
--- a/tools/testing/selftests/rseq/rseq-ppc.h
+++ b/tools/testing/selftests/rseq/rseq-ppc.h
@@ -236,7 +236,7 @@ int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),
                  [newv]                "r" (newv)
@@ -302,7 +302,7 @@ int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expectnot]           "r" (expectnot),
@@ -360,7 +360,7 @@ int rseq_addv(intptr_t *v, intptr_t count, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [count]               "r" (count)
@@ -420,7 +420,7 @@ int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* try store input */
                  [v2]                  "m" (*v2),
                  [newv2]               "r" (newv2),
@@ -490,7 +490,7 @@ int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* try store input */
                  [v2]                  "m" (*v2),
                  [newv2]               "r" (newv2),
@@ -561,7 +561,7 @@ int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* cmp2 input */
                  [v2]                  "m" (*v2),
                  [expect2]             "r" (expect2),
@@ -636,7 +636,7 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),
@@ -712,7 +712,7 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),

diff --git a/tools/testing/selftests/rseq/rseq-s390.h b/tools/testing/selftests/rseq/rseq-s390.h
index b906e04..9927021 100644 (file)
--- a/tools/testing/selftests/rseq/rseq-s390.h
+++ b/tools/testing/selftests/rseq/rseq-s390.h
@@ -166,7 +166,7 @@ int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),
                  [newv]                "r" (newv)
@@ -234,7 +234,7 @@ int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expectnot]           "r" (expectnot),
@@ -289,7 +289,7 @@ int rseq_addv(intptr_t *v, intptr_t count, int cpu)
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [count]               "r" (count)
@@ -348,7 +348,7 @@ int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* try store input */
                  [v2]                  "m" (*v2),
                  [newv2]               "r" (newv2),
@@ -427,7 +427,7 @@ int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* cmp2 input */
                  [v2]                  "m" (*v2),
                  [expect2]             "r" (expect2),
@@ -535,7 +535,7 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
                : /* gcc asm goto does not allow outputs */
                : [cpu_id]              "r" (cpu),
                  [current_cpu_id]      "m" (rseq_get_abi()->cpu_id),
-                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs),
+                 [rseq_cs]             "m" (rseq_get_abi()->rseq_cs.arch.ptr),
                  /* final store input */
                  [v]                   "m" (*v),
                  [expect]              "r" (expect),