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b=gfXxw9+Bwj2TU0VyQK1TZ+5IcgYO3eONpROFV+s9+K0X/mFhFqCvFlxsLCho8jLBDp307O00XZjmgwC1+JuZ8jZSbNjucERSlMHAaXCm4ZuRQiiWFUAKTbnVMTG+uhZrrqxVC13RSxDYwyYc21L244a4bUsCrn4BfhA7ZCij8n8= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=epfl.ch; Message-ID: <0b65f1ca-c960-4d9a-9029-23974218da80@epfl.ch> Date: Mon, 6 Oct 2025 15:23:18 +0200 User-Agent: Mozilla Thunderbird Subject: [RFC PATCH v2 2/2] tests/tcg: add test for qemu_plugin_set_pc API From: Florian Hofhammer To: qemu-devel@nongnu.org References: Content-Language: en-US Cc: alex.bennee@linaro.org, pierrick.bouvier@linaro.org, richard.henderson@linaro.org, laurent@vivier.eu, imp@bsdimp.com, berrange@redhat.com Autocrypt: addr=florian.hofhammer@epfl.ch; keydata= xsFNBFw7TEkBEADaJzHcW02rDYHgS2X2kjyXLs99tnNpww/r3MlWEkrKxgfgIRbtVQTJ2vNw mxIhJnAo/Ltu2VoEXU1WGwoMGv8wxquIuE1RBnYghnYPFd4SOMX8fXz5JylHpl+vPCWiP8U0 fFWfVL1vyldQG4aVtufaJ1VEOU8zsw6YeXzxWJJ7ppUag4teMKuFya69tEEN74KLkDMJRxGk pj7rHW8Y+xBdNW9hQ2vAXhWAtm64NtCtJcJYP8RNl/jqlqYTP1Voj7byXym9HUM7NGEbGtrw 4KKi9ws1yZv9BkW3ECBg5Q1w3WYmHfwqSa+8vrD2ahNieDYNu7veYP0oMaohumRgVhiaMscD IY8wqyt6K93RiwXDQjDAqwE44xrZDr4jjCUAm1D/7WYZWtzhsiDq80JasMbXd8SLKGr96zX5 6vJGxa6OvyavRO7Y7DGK/dNPWdZqAC4QlluibdRsbkFLtBg8d60sVxYW8A9o46rrQB8qzglc joPhDebr8/NsI0gnzjgpgmNbresqne4/JIylUuJEwYcOWZqKqDw9U03uTFk/Vp6AxmRquWpy XZJVBsMNbunclgSelZIt2nzCa2nXR5MYyV2Y8ays+gSAPeHFOc6a8JWNLhgVKUed12XVrMUQ bmMmTFWWqfrx89Up4a+jW7uGIzexOeXUXKeE1j0uGsRLk6CF7QARAQABzTRGbG9yaWFuIEhv ZmhhbW1lciAoRVBGTCkgPGZsb3JpYW4uaG9maGFtbWVyQGVwZmwuY2g+wsGUBBMBCAA+AhsD BQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAFiEEqCB8P0q+u+2bTfhJlusnujFfx3wFAmfOq/AF CQ10kyEACgkQlusnujFfx3wl9Q//cNbHsBz6YvTzzi3fddVVYnEn7YBPMAw0r4vxtYpLCvpD sKOfMaGYYoV3AbVton2w53qTFcmTC/7J0/UxIi/cH1sWgVipZuVNrtESZFhkKAKpqJvHamPl uDD0kmINzztgNZOz44iUdGkSvqQW6ou5WpSEk9YEks4KPs/EH00l7hQ8YkfR/8oN63OxpYri W4+obeU45fBPPgOO1U1eMtWp/QBvo2qw+GiRQkq8kjKDTt9AYYPfcA+AdnhocgrQ2SdtcBuZ bb1BQnKEqWM2gVpvk/ujyZZktgBvqtoubAwaMpAGNgCoDju/zPf8wtbc/yo+AT+iiRQKuilm mQ7U0THfk3+DewN9CTZUiL1X6NdoUuLMqdSI4HCpo/d/N59wMkRKXHG2h/pKmTLbrHGFA4ZY a4zNN98yyPcq6OeAqurWbotXm7yxraXKkFD5dbBJcZYc5gJx+rZg2pIy+rYtQKqZWJTZhl2s ZrHNl1b8cEyS8vuiSZPjFnzgzVoBS1QE136ke/6P3rFPR4zPLyhZqKbCsGHR/BDfSCzeRwoE zJ3aV/8kmuyAfx1iTWVBLKJsPkiNS08jf+Nb+leo8Vab7AnolDTIr0o06bWas1AsIRG31/Zs wBRDlfjmKZ08f+B6a1SpkhdltGozljNt1PLEposY19aw5Ou3bqFQkYtooTfnZPnOwU0EXgiz 6wEQAM8iX+Y1mi1l3h876YmnuP8JSO1s6k0lABDO42pZaSp6Q9mFOabB7To80q1qEXCznlcR nExrN29WwXkfL2tcV4t/JFb0o4+6J9MmMUR3kdvRu55b/AGncNj0oggZDP8e5cLikv8v1ReV c//RPKSHVKnlmC9gtM0UHWpwHyyoplHi4sMJ8WyzGKfnN1eg7HlSx0xJAE7wKQP59mIMMj7n IXnk7bnGO7oaqy+i2vAxcdJPN6jvFgFCsKECL4NJCw6ifrY05paYRXza8JVwAcCzw0Sx4gZi JXC+gE4p80qNRrwR5AQuyLQNO9EfKLdnKg/85ag7xjB3ZWYMZNbj7HwCB+T16jOS+6lgGONf vctIp+hTFxXoCEnMx96FydDkqaBBjAU0JkbxhpMWFhzKzEILa60fxDxOSYHSs6h3bLk3D+gO i8j1SUPC4Olj9od7VIZDKGLd/nLw5qSt2c0H69cW1M/KS5zVARZQPb8Cqa9SAWdjmGw6MHvc WoYK4mT1arhwUlmrqUMcNqA+foGjDGPsxCQxqqIU2rB590n2wafu65UuyPUmzxOGdcb31I4E kkoBnM6G5nN4uZUCQPXl/DFlq/cfFI7LmIL2aZt6idehfvd+iOND4HDjRzrYDhz1FQn2Ihoi qHNMO4zSpWv35fl5kHfo1iYojwcd/aiyu4V8wo7TABEBAAHCwXwEGAEIACYCGwwWIQSoIHw/ Sr677ZtN+EmW6ye6MV/HfAUCZ86rzQUJC6crYgAKCRCW6ye6MV/HfK3jEACTixlDX+Xa53/f RS4AgdiLLcPnp63HYSe58cul/U8mGfcP8/wZXkPFzpsQZRONmj0vNHFAlTlQHpBnMmqxUvVx SosHPMrSwukjV/zDgTeYe8iZbqDjUEFIJvEU4mQd1O2/bfBCi0N0GuleN+oyu4cHhgJIN/Ym 3yJks/Aeprt4k3YwTZsGRCQ4fVyfmnHyYGLNKjtR/ubibG1I4hDVhf1IwrvsAcpHw1UKf/5+ ZA3O6ZANAwVG2iAidR2LhFPiBAFWtPmI0dX5i8+Hu5CmXlHkYK2TV8ys9zDuOEiWEcMR/9tA agcgw3orjj0lvFiSGYI9+w1NxO76T/by09nWsLXr8Mas+pFaKUP0Wk9vZjj+8TqPTkoKOMJS /+vsAGjFLM1ZfFyLRvVVJH4gaWs5zie533zYlArVA1db36+YGTBWzuHEawITPaLq/FngWb+e bxL9a5LkhEdTCnQVhBaC0yBbplRQcGwsc8IRK0sdWiRIGtlr6NMt1yw+3TwVsBPaYvLM/qfm pBZkz7hBNr2qTLcl1xeP4MMdMO2ubBUGTR5B+sOzaT1qIBe5XNFkhffLTR+YmkW1PXWz7tcO yQcudEYHvYhKegsw0Zjv8iQIQw3yeV0WbQAs+LGQAfwpVURhZgBk3DH9gQBFkZYi8YWX/zEc 5hMMZIzTI4AtIcgA3xe4Ew== In-Reply-To: Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: GV0P278CA0029.CHEP278.PROD.OUTLOOK.COM (2603:10a6:710:28::16) To ZRH2PFAD84B9AF9.CHEP278.PROD.OUTLOOK.COM (2603:10a6:918::220) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: ZRH2PFAD84B9AF9:EE_|GV0P278MB1185:EE_ X-MS-Office365-Filtering-Correlation-Id: 84fddb74-3862-431a-a6a4-08de04dbdb55 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c213::2; envelope-from=florian.hofhammer@epfl.ch; helo=ZRZP278CU001.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @epfl.ch) X-ZM-MESSAGEID: 1759757275891116600 Content-Type: text/plain; charset="utf-8" The test executes a non-existent syscall, which the syscall plugin intercepts and redirects to a clean exit. Due to architecture-specific quirks, the Makefile requires setting specific compiler and linker flags for some architectures. Signed-off-by: Florian Hofhammer --- tests/tcg/multiarch/Makefile.target | 42 +++++++++++++++++++ .../tcg/multiarch/test-plugin-skip-syscalls.c | 26 ++++++++++++ tests/tcg/plugins/syscall.c | 6 +++ 3 files changed, 74 insertions(+) create mode 100644 tests/tcg/multiarch/test-plugin-skip-syscalls.c diff --git a/tests/tcg/multiarch/Makefile.target b/tests/tcg/multiarch/Make= file.target index f5b4d2b813..7df3da2aba 100644 --- a/tests/tcg/multiarch/Makefile.target +++ b/tests/tcg/multiarch/Makefile.target @@ -204,6 +204,48 @@ run-plugin-test-plugin-mem-access-with-libmem.so: \ $(QEMU) $< =20 EXTRA_RUNS_WITH_PLUGIN +=3D run-plugin-test-plugin-mem-access-with-libmem.= so + +# Test plugin control flow redirection by skipping system calls +ifeq ($(TARGET),arm-linux-user) +# Require emitting arm32 instructions, otherwise the vCPU might accidental= ly +# try to execute Thumb instructions in arm32 mode after qemu_plugin_set_pc= () +test-plugin-skip-syscalls: CFLAGS+=3D-marm +endif +ifneq ($(filter mips64%-linux-user,$(TARGET)),) +# Require no ABI calls to avoid $t9-relative .got address calculation +test-plugin-skip-syscalls: CFLAGS+=3D-mno-abicalls -fno-pie +test-plugin-skip-syscalls: LDFLAGS+=3D-no-pie +endif +ifneq ($(filter mips%-linux-user,\ + $(filter-out mips64%-linux-user,\ + $(TARGET))),) +# qemu-mips(el) returns ENOSYS without triggering syscall plugin callbacks +run-plugin-test-plugin-skip-syscalls-with-libsyscall.so: + $(call skip-test, $<, "qemu-mips(el) does not execute invalid syscalls") +endif +ifeq ($(TARGET),sparc64-linux-user) +# The defined addresses for the binary are not aligned correctly for sparc= 64 +# but adjusting them breaks other architectures, so just skip it on sparc6= 4. +run-plugin-test-plugin-skip-syscalls-with-libsyscall.so: + $(call skip-test, $<, "qemu-sparc64 does not allow mapping at our given f= ixed address") +endif +ifeq ($(TARGET),hexagon-linux-user) +# hexagon uses clang/lld which does not support -Ttext-segment but GNU ld = does +# not generally support --image-base. +test-plugin-skip-syscalls: LDFLAGS+=3D-Wl,--image-base=3D0x40000 +else +test-plugin-skip-syscalls: LDFLAGS+=3D-Wl,-Ttext-segment=3D0x40000 +endif +test-plugin-skip-syscalls: LDFLAGS+=3D-Wl,--section-start,.redirect=3D0x20= 000 +run-plugin-test-plugin-skip-syscalls-with-libsyscall.so: + +EXTRA_RUNS_WITH_PLUGIN +=3D run-plugin-test-plugin-skip-syscalls-with-libs= yscall.so + +else # CONFIG_PLUGIN=3Dn +# Do not build the syscall skipping test if it's not tested with a plugin +# because it will simply return an error and fail the test. +MULTIARCH_TESTS :=3D $(filter-out "test-plugin-skip-syscalls", $(MULTIARCH= _TESTS)) + endif =20 # Update TESTS diff --git a/tests/tcg/multiarch/test-plugin-skip-syscalls.c b/tests/tcg/mu= ltiarch/test-plugin-skip-syscalls.c new file mode 100644 index 0000000000..1f5cbc3851 --- /dev/null +++ b/tests/tcg/multiarch/test-plugin-skip-syscalls.c @@ -0,0 +1,26 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + * + * This test attempts to execute an invalid syscall. The syscall test plug= in + * should intercept this. + */ +#include +#include +#include +#include + +void exit_success(void) __attribute__((section(".redirect"), noinline, + noreturn, used)); + +void exit_success(void) { + _exit(EXIT_SUCCESS); +} + +int main(int argc, char *argv[]) { + long ret =3D syscall(0xc0deUL); + if (ret !=3D 0L) { + perror(""); + } + /* We should never get here */ + return EXIT_FAILURE; +} diff --git a/tests/tcg/plugins/syscall.c b/tests/tcg/plugins/syscall.c index 42801f5c86..c5bac2d928 100644 --- a/tests/tcg/plugins/syscall.c +++ b/tests/tcg/plugins/syscall.c @@ -148,6 +148,12 @@ static void vcpu_syscall(qemu_plugin_id_t id, unsigned= int vcpu_index, fprintf(stderr, "Error reading memory from vaddr %"PRIu64"\n",= a2); } } + + if (num =3D=3D 0xc0deUL) { + /* Special syscall to test the control flow redirection functional= ity. */ + qemu_plugin_outs("Marker syscall detected, jump to clean exit\n"); + qemu_plugin_set_pc(0x20000); + } } =20 static void vcpu_syscall_ret(qemu_plugin_id_t id, unsigned int vcpu_idx, --=20 2.51.0