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([71.212.157.132]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-78b02053a51sm5418769b3a.46.2025.10.03.10.12.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Oct 2025 10:12:07 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Pierrick Bouvier Subject: [PATCH v6 73/73] tests/tcg/aarch64: Add gcsss Date: Fri, 3 Oct 2025 10:08:00 -0700 Message-ID: <20251003170800.997167-74-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251003170800.997167-1-richard.henderson@linaro.org> References: <20251003170800.997167-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::436; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x436.google.com X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Validate stack switching and recursion depth. Reviewed-by: Pierrick Bouvier Signed-off-by: Richard Henderson --- tests/tcg/aarch64/gcs.h | 9 ++++ tests/tcg/aarch64/gcsss.c | 74 +++++++++++++++++++++++++++++++ tests/tcg/aarch64/Makefile.target | 2 +- 3 files changed, 84 insertions(+), 1 deletion(-) create mode 100644 tests/tcg/aarch64/gcsss.c diff --git a/tests/tcg/aarch64/gcs.h b/tests/tcg/aarch64/gcs.h index 99cb4d4e38..e821963cb8 100644 --- a/tests/tcg/aarch64/gcs.h +++ b/tests/tcg/aarch64/gcs.h @@ -69,3 +69,12 @@ #define gcspr() \ ({ uint64_t *r; asm volatile("mrs %0, s3_3_c2_c5_1" : "=r"(r)); r; }) + +#define gcsss1(val) \ + do { \ + asm volatile("sys #3, c7, c7, #2, %0" : : "r"(val) : "memory"); \ + } while (0) + +#define gcsss2() \ + ({ uint64_t *r; \ + asm volatile("sysl %0, #3, c7, c7, #3" : "=r"(r) : : "memory"); r; }) diff --git a/tests/tcg/aarch64/gcsss.c b/tests/tcg/aarch64/gcsss.c new file mode 100644 index 0000000000..9550c68e7e --- /dev/null +++ b/tests/tcg/aarch64/gcsss.c @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include "gcs.h" + +#define IN_PROGRESS(X) ((uint64_t)(X) | 5) +#define CAP(X) (((uint64_t)(X) & ~0xfff) + 1) + +static uint64_t * __attribute__((noinline)) recurse(size_t index) +{ + if (index == 0) { + return gcspr(); + } + return recurse(index - 1); +} + +int main() +{ + void *tmp; + uint64_t *alt_stack, *alt_cap; + uint64_t *orig_pr, *orig_cap; + uint64_t *bottom; + size_t pagesize = getpagesize(); + size_t words; + + enable_gcs(0); + orig_pr = gcspr(); + + /* Allocate a guard page before and after. */ + tmp = mmap(0, 3 * pagesize, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0); + assert(tmp != MAP_FAILED); + + /* map_shadow_stack won't replace existing mappings */ + munmap(tmp + pagesize, pagesize); + + /* Allocate a new stack between the guards. */ + alt_stack = (uint64_t *) + syscall(__NR_map_shadow_stack, tmp + pagesize, pagesize, + SHADOW_STACK_SET_TOKEN); + assert(alt_stack == tmp + pagesize); + + words = pagesize / 8; + alt_cap = alt_stack + words - 1; + + /* SHADOW_STACK_SET_TOKEN set the cap. */ + assert(*alt_cap == CAP(alt_cap)); + + /* Swap to the alt stack, one step at a time. */ + gcsss1(alt_cap); + + assert(gcspr() == alt_cap); + assert(*alt_cap == IN_PROGRESS(orig_pr)); + + orig_cap = gcsss2(); + + assert(orig_cap == orig_pr - 1); + assert(*orig_cap == CAP(orig_cap)); + assert(gcspr() == alt_stack + words); + + /* We should be able to use the whole stack. */ + bottom = recurse(words - 1); + assert(bottom == alt_stack); + + /* We should be back where we started. */ + assert(gcspr() == alt_stack + words); + + /* Swap back to the original stack. */ + gcsss1(orig_cap); + tmp = gcsss2(); + + assert(gcspr() == orig_pr); + assert(tmp == alt_cap); + + exit(0); +} diff --git a/tests/tcg/aarch64/Makefile.target b/tests/tcg/aarch64/Makefile.target index fddb7bc9cd..55ce34e45e 100644 --- a/tests/tcg/aarch64/Makefile.target +++ b/tests/tcg/aarch64/Makefile.target @@ -76,7 +76,7 @@ $(SME_TESTS): CFLAGS += $(CROSS_AS_HAS_ARMV9_SME) endif # GCS Tests -GCS_TESTS += gcsstr gcspushm +GCS_TESTS += gcsstr gcspushm gcsss AARCH64_TESTS += $(GCS_TESTS) $(GCS_TESTS): gcs.h -- 2.43.0