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([38.41.223.211]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b428ba4cf35sm3705433a12.14.2025.08.07.19.07.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Aug 2025 19:07:15 -0700 (PDT) From: Pierrick Bouvier To: pierrick.bouvier@linaro.org, qemu-devel@nongnu.org Cc: Mahmoud Mandour , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , rowan Hart , Gustavo Romero , Manos Pitsidianakis , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Alexandre Iooss , Peter Maydell , Richard Henderson Subject: [PATCH v5 7/9] contrib/plugins/uftrace: implement x64 support Date: Thu, 7 Aug 2025 19:07:00 -0700 Message-ID: <20250808020702.410109-8-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250808020702.410109-1-pierrick.bouvier@linaro.org> References: <20250808020702.410109-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::42c; envelope-from=pierrick.bouvier@linaro.org; helo=mail-pf1-x42c.google.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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org It's trivial to implement x64 support, as it's the same stack layout than aarch64. Signed-off-by: Pierrick Bouvier --- contrib/plugins/uftrace.c | 85 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) diff --git a/contrib/plugins/uftrace.c b/contrib/plugins/uftrace.c index 6628b4256fd..f10172eed10 100644 --- a/contrib/plugins/uftrace.c +++ b/contrib/plugins/uftrace.c @@ -79,6 +79,20 @@ typedef struct { struct qemu_plugin_register *reg_scr_el3; } Aarch64Cpu; +typedef enum { + X64_RING0, + X64_RING1, + X64_RING2, + X64_RING3, + X64_REAL_MODE, +} X64PrivilegeLevel; + +typedef struct { + struct qemu_plugin_register *reg_rbp; + struct qemu_plugin_register *reg_cs; + struct qemu_plugin_register *reg_cr0; +} X64Cpu; + typedef struct { uint64_t timestamp; uint64_t data; @@ -565,6 +579,75 @@ static CpuOps aarch64_ops = { .does_insn_modify_frame_pointer = aarch64_does_insn_modify_frame_pointer, }; +static uint8_t x64_num_privilege_levels(void) +{ + return X64_REAL_MODE + 1; +} + +static const char *x64_get_privilege_level_name(uint8_t pl) +{ + switch (pl) { + case X64_RING0: return "Ring0"; + case X64_RING1: return "Ring1"; + case X64_RING2: return "Ring2"; + case X64_RING3: return "Ring3"; + case X64_REAL_MODE: return "RealMode"; + default: + g_assert_not_reached(); + } +} + +static uint8_t x64_get_privilege_level(Cpu *cpu_) +{ + X64Cpu *cpu = cpu_->arch; + uint64_t cr0 = cpu_read_register64(cpu_, cpu->reg_cr0); + uint64_t protected_mode = (cr0 >> 0) & 0b1; + if (!protected_mode) { + return X64_REAL_MODE; + } + uint32_t cs = cpu_read_register32(cpu_, cpu->reg_cs); + uint32_t ring_level = (cs >> 0) & 0b11; + return ring_level; +} + +static uint64_t x64_get_frame_pointer(Cpu *cpu_) +{ + X64Cpu *cpu = cpu_->arch; + return cpu_read_register64(cpu_, cpu->reg_rbp); +} + +static void x64_init(Cpu *cpu_) +{ + X64Cpu *cpu = g_new0(X64Cpu, 1); + cpu_->arch = cpu; + cpu->reg_rbp = plugin_find_register("rbp"); + g_assert(cpu->reg_rbp); + cpu->reg_cs = plugin_find_register("cs"); + g_assert(cpu->reg_cs); + cpu->reg_cr0 = plugin_find_register("cr0"); + g_assert(cpu->reg_cr0); +} + +static void x64_end(Cpu *cpu) +{ + g_free(cpu->arch); +} + +static bool x64_does_insn_modify_frame_pointer(const char *disas) +{ + return strstr(disas, "rbp"); +} + +static CpuOps x64_ops = { + .init = x64_init, + .end = x64_end, + .get_frame_pointer = x64_get_frame_pointer, + .get_privilege_level = x64_get_privilege_level, + .num_privilege_levels = x64_num_privilege_levels, + .get_privilege_level_name = x64_get_privilege_level_name, + .does_insn_modify_frame_pointer = x64_does_insn_modify_frame_pointer, +}; + static void track_privilege_change(unsigned int cpu_index, void *udata) { Cpu *cpu = qemu_plugin_scoreboard_find(score, cpu_index); @@ -771,6 +854,8 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, if (!strcmp(info->target_name, "aarch64")) { arch_ops = aarch64_ops; + } else if (!strcmp(info->target_name, "x86_64")) { + arch_ops = x64_ops; } else { fprintf(stderr, "plugin uftrace: %s target is not supported\n", info->target_name); -- 2.47.2