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tests/tcg/aarch64: Add gcspushm

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Validate successful and trapped executions of GCSPUSHM, GCSPOPM.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20251008215613.300150-73-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson
2025-10-10 13:22:05 +01:00
committed by Peter Maydell
parent 3f3cc39b7d
commit 8f278acdce
2 changed files with 72 additions and 1 deletions
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tests/tcg/aarch64/Makefile.target
+1 -1
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@@ -76,7 +76,7 @@ $(SME_TESTS): CFLAGS += $(CROSS_AS_HAS_ARMV9_SME)
endif
# GCS Tests
GCS_TESTS += gcsstr
GCS_TESTS += gcsstr gcspushm
AARCH64_TESTS += $(GCS_TESTS)
$(GCS_TESTS): gcs.h
tests/tcg/aarch64/gcspushm.c
+71
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@@ -0,0 +1,71 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "gcs.h"
#define GCSPUSHM "sys #3, c7, c7, #0, %[push]"
#define GCSPOPM "sysl %[pop], #3, c7, c7, #1"
static void test_sigsegv(int sig, siginfo_t *info, void *vuc)
{
ucontext_t *uc = vuc;
uint64_t inst_sigsegv;
__asm__("adr %0, inst_sigsegv" : "=r"(inst_sigsegv));
assert(uc->uc_mcontext.pc == inst_sigsegv);
assert(info->si_code == SEGV_CPERR);
/* TODO: Dig for ESR and verify syndrome. */
uc->uc_mcontext.pc += 4;
}
static void test_sigill(int sig, siginfo_t *info, void *vuc)
{
ucontext_t *uc = vuc;
uint64_t inst_sigill;
__asm__("adr %0, inst_sigill" : "=r"(inst_sigill));
assert(uc->uc_mcontext.pc == inst_sigill);
assert(info->si_code == ILL_ILLOPC);
uc->uc_mcontext.pc += 4;
}
int main()
{
struct sigaction sa = { .sa_flags = SA_SIGINFO };
uint64_t old, new;
sa.sa_sigaction = test_sigsegv;
if (sigaction(SIGSEGV, &sa, NULL) < 0) {
perror("sigaction");
exit(1);
}
sa.sa_sigaction = test_sigill;
if (sigaction(SIGILL, &sa, NULL) < 0) {
perror("sigaction");
exit(1);
}
/* Pushm is disabled -- SIGILL via EC_SYSTEMREGISTERTRAP */
asm volatile("inst_sigill:\t" GCSPUSHM
: : [push] "r" (1));
enable_gcs(PR_SHADOW_STACK_PUSH);
/* Valid value -- low 2 bits clear */
old = 0xdeadbeeffeedcaec;
asm volatile(GCSPUSHM "\n\t" GCSPOPM
: [pop] "=r" (new)
: [push] "r" (old)
: "memory");
assert(old == new);
/* Invalid value -- SIGSEGV via EC_GCS */
asm volatile(GCSPUSHM "\n"
"inst_sigsegv:\t" GCSPOPM
: [pop] "=r" (new)
: [push] "r" (1)
: "memory");
exit(0);
}