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Fri, 09 Feb 2024 11:47:41 -0800 (PST) X-Forwarded-Encrypted: i=1; AJvYcCWmHZqaGAZO4uWzETZYAhM/YftpreNJ+82Ub/10ojXK9H/kKBD6m4VtlEfaI4CJ+9k6XiSO+D8ggz0smfe2USgGQvPLS1qBzZUSY4SmAkrPf1Hsx0RaMLL3Uw== From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: Ilya Leoshkevich , =?UTF-8?q?Alex=20Benn=C3=A9e?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PULL 09/10] gdbstub: Implement catching syscalls Date: Fri, 9 Feb 2024 19:47:33 +0000 Message-Id: <20240209194734.3424785-10-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240209194734.3424785-1-alex.bennee@linaro.org> References: <20240209194734.3424785-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::434; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x434.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, T_SCC_BODY_TEXT_LINE=-0.01 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 @linaro.org) X-ZM-MESSAGEID: 1707508153013100017 From: Ilya Leoshkevich GDB supports stopping on syscall entry and exit using the "catch syscall" command. It relies on 3 packets, which are currently not supported by QEMU: * qSupported:QCatchSyscalls+ [1] * QCatchSyscalls: [2] * T05syscall_entry: and T05syscall_return: [3] Implement generation and handling of these packets. [1] https://sourceware.org/gdb/current/onlinedocs/gdb.html/General-Query-Pa= ckets.html#qSupported [2] https://sourceware.org/gdb/current/onlinedocs/gdb.html/General-Query-Pa= ckets.html#QCatchSyscalls [3] https://sourceware.org/gdb/current/onlinedocs/gdb.html/Stop-Reply-Packe= ts.html Signed-off-by: Ilya Leoshkevich Message-Id: <20240202152506.279476-5-iii@linux.ibm.com> [AJB: GString -> g_strdup_printf] Signed-off-by: Alex Benn=C3=A9e Message-Id: <20240207163812.3231697-14-alex.bennee@linaro.org> diff --git a/gdbstub/internals.h b/gdbstub/internals.h index aeb0d9b5377..56b7c13b750 100644 --- a/gdbstub/internals.h +++ b/gdbstub/internals.h @@ -195,6 +195,7 @@ void gdb_handle_v_file_close(GArray *params, void *user= _ctx); /* user */ void gdb_handle_v_file_pread(GArray *params, void *user_ctx); /* user */ void gdb_handle_v_file_readlink(GArray *params, void *user_ctx); /* user */ void gdb_handle_query_xfer_exec_file(GArray *params, void *user_ctx); /* u= ser */ +void gdb_handle_set_catch_syscalls(GArray *params, void *user_ctx); /* use= r */ =20 void gdb_handle_query_attached(GArray *params, void *user_ctx); /* both */ =20 diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c index 46d752bbc2c..7e73e916bdc 100644 --- a/gdbstub/gdbstub.c +++ b/gdbstub/gdbstub.c @@ -1617,6 +1617,7 @@ static void handle_query_supported(GArray *params, vo= id *user_ctx) if (gdbserver_state.c_cpu->opaque) { g_string_append(gdbserver_state.str_buf, ";qXfer:auxv:read+"); } + g_string_append(gdbserver_state.str_buf, ";QCatchSyscalls+"); #endif g_string_append(gdbserver_state.str_buf, ";qXfer:exec-file:read+"); #endif @@ -1810,6 +1811,14 @@ static const GdbCmdParseEntry gdb_gen_set_table[] = =3D { .schema =3D "l0" }, #endif +#if defined(CONFIG_USER_ONLY) + { + .handler =3D gdb_handle_set_catch_syscalls, + .cmd =3D "CatchSyscalls:", + .cmd_startswith =3D 1, + .schema =3D "s0", + }, +#endif }; =20 static void handle_gen_query(GArray *params, void *user_ctx) diff --git a/gdbstub/user.c b/gdbstub/user.c index 2ba01c17faf..14918d1a217 100644 --- a/gdbstub/user.c +++ b/gdbstub/user.c @@ -10,6 +10,7 @@ */ =20 #include "qemu/osdep.h" +#include "qemu/bitops.h" #include "qemu/cutils.h" #include "qemu/sockets.h" #include "exec/hwaddr.h" @@ -21,11 +22,20 @@ #include "trace.h" #include "internals.h" =20 +#define GDB_NR_SYSCALLS 1024 +typedef unsigned long GDBSyscallsMask[BITS_TO_LONGS(GDB_NR_SYSCALLS)]; + /* User-mode specific state */ typedef struct { int fd; char *socket_path; int running_state; + /* + * Store syscalls mask without memory allocation in order to avoid + * implementing synchronization. + */ + bool catch_all_syscalls; + GDBSyscallsMask catch_syscalls_mask; } GDBUserState; =20 static GDBUserState gdbserver_user_state; @@ -503,10 +513,91 @@ void gdb_syscall_handling(const char *syscall_packet) gdb_handlesig(gdbserver_state.c_cpu, 0); } =20 +static bool should_catch_syscall(int num) +{ + if (gdbserver_user_state.catch_all_syscalls) { + return true; + } + if (num < 0 || num >=3D GDB_NR_SYSCALLS) { + return false; + } + return test_bit(num, gdbserver_user_state.catch_syscalls_mask); +} + void gdb_syscall_entry(CPUState *cs, int num) { + if (should_catch_syscall(num)) { + g_autofree char *reason =3D g_strdup_printf("syscall_entry:%x;", n= um); + gdb_handlesig_reason(cs, gdb_target_sigtrap(), reason); + } } =20 void gdb_syscall_return(CPUState *cs, int num) { + if (should_catch_syscall(num)) { + g_autofree char *reason =3D g_strdup_printf("syscall_return:%x;", = num); + gdb_handlesig_reason(cs, gdb_target_sigtrap(), reason); + } +} + +void gdb_handle_set_catch_syscalls(GArray *params, void *user_ctx) +{ + const char *param =3D get_param(params, 0)->data; + GDBSyscallsMask catch_syscalls_mask; + bool catch_all_syscalls; + unsigned int num; + const char *p; + + /* "0" means not catching any syscalls. */ + if (strcmp(param, "0") =3D=3D 0) { + gdbserver_user_state.catch_all_syscalls =3D false; + memset(gdbserver_user_state.catch_syscalls_mask, 0, + sizeof(gdbserver_user_state.catch_syscalls_mask)); + gdb_put_packet("OK"); + return; + } + + /* "1" means catching all syscalls. */ + if (strcmp(param, "1") =3D=3D 0) { + gdbserver_user_state.catch_all_syscalls =3D true; + gdb_put_packet("OK"); + return; + } + + /* + * "1;..." means catching only the specified syscalls. + * The syscall list must not be empty. + */ + if (param[0] =3D=3D '1' && param[1] =3D=3D ';') { + catch_all_syscalls =3D false; + memset(catch_syscalls_mask, 0, sizeof(catch_syscalls_mask)); + for (p =3D ¶m[2];; p++) { + if (qemu_strtoui(p, &p, 16, &num) || (*p && *p !=3D ';')) { + goto err; + } + if (num >=3D GDB_NR_SYSCALLS) { + /* + * Fall back to reporting all syscalls. Reporting extra + * syscalls is inefficient, but the spec explicitly allows= it. + * Keep parsing in case there is a syntax error ahead. + */ + catch_all_syscalls =3D true; + } else { + set_bit(num, catch_syscalls_mask); + } + if (!*p) { + break; + } + } + gdbserver_user_state.catch_all_syscalls =3D catch_all_syscalls; + if (!catch_all_syscalls) { + memcpy(gdbserver_user_state.catch_syscalls_mask, + catch_syscalls_mask, sizeof(catch_syscalls_mask)); + } + gdb_put_packet("OK"); + return; + } + +err: + gdb_put_packet("E00"); } --=20 2.39.2