/* * System call tracing and debugging * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include <stdio.h> #include <errno.h> #include <sys/select.h> #include <sys/types.h> #include <unistd.h> #include <sys/syscall.h> #include <sys/ioccom.h> #include <ctype.h> #include "qemu.h" int do_strace; /* * Utility functions */ static void print_sysctl(const struct syscallname *name, abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6) { uint32_t i; int32_t *namep; gemu_log("%s({ ", name->name); namep = lock_user(VERIFY_READ, arg1, sizeof(int32_t) * arg2, 1); if (namep) { int32_t *p = namep; for (i = 0; i < (uint32_t)arg2; i++) { gemu_log("%d ", tswap32(*p++)); } unlock_user(namep, arg1, 0); } gemu_log("}, %u, 0x" TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ")", (uint32_t)arg2, arg3, arg4, arg5, arg6); } static void print_execve(const struct syscallname *name, abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6) { abi_ulong arg_ptr_addr; char *s; s = lock_user_string(arg1); if (s == NULL) { return; } gemu_log("%s(\"%s\",{", name->name, s); unlock_user(s, arg1, 0); for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) { abi_ulong *arg_ptr, arg_addr; arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1); if (!arg_ptr) { return; } arg_addr = tswapl(*arg_ptr); unlock_user(arg_ptr, arg_ptr_addr, 0); if (!arg_addr) { break; } if ((s = lock_user_string(arg_addr))) { gemu_log("\"%s\",", s); unlock_user(s, arg_addr, 0); } } gemu_log("NULL})"); } static void print_ioctl(const struct syscallname *name, abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6) { /* Decode the ioctl request */ gemu_log("%s(%d, 0x%0lx { IO%s%s GRP:0x%x('%c') CMD:%d LEN:%d }, 0x" TARGET_ABI_FMT_lx ", ...)", name->name, (int)arg1, (unsigned long)arg2, arg2 & IOC_OUT ? "R" : "", arg2 & IOC_IN ? "W" : "", (unsigned)IOCGROUP(arg2), isprint(IOCGROUP(arg2)) ? (char)IOCGROUP(arg2) : '?', (int)arg2 & 0xFF, (int)IOCPARM_LEN(arg2), arg3); } /* * Variants for the return value output function */ static void print_syscall_ret_addr(const struct syscallname *name, abi_long ret) { if (ret == -1) { gemu_log(" = -1 errno=%d (%s)\n", errno, strerror(errno)); } else { gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret); } } #if 0 /* currently unused */ static void print_syscall_ret_raw(struct syscallname *name, abi_long ret) { gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret); } #endif /* * An array of all of the syscalls we know about */ static const struct syscallname freebsd_scnames[] = { #include "freebsd/strace.list" }; static const struct syscallname netbsd_scnames[] = { #include "netbsd/strace.list" }; static const struct syscallname openbsd_scnames[] = { #include "openbsd/strace.list" }; static void print_syscall(int num, const struct syscallname *scnames, unsigned int nscnames, abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6) { unsigned int i; const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ")"; gemu_log("%d ", getpid() ); for (i = 0; i < nscnames; i++) { if (scnames[i].nr == num) { if (scnames[i].call != NULL) { scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5, arg6); } else { /* XXX: this format system is broken because it uses host types and host pointers for strings */ if (scnames[i].format != NULL) { format = scnames[i].format; } gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4, arg5, arg6); } return; } } gemu_log("Unknown syscall %d\n", num); } static void print_syscall_ret(int num, abi_long ret, const struct syscallname *scnames, unsigned int nscnames) { unsigned int i; for (i = 0; i < nscnames; i++) { if (scnames[i].nr == num) { if (scnames[i].result != NULL) { scnames[i].result(&scnames[i], ret); } else { if (ret < 0) { gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret, strerror(-ret)); } else { gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret); } } break; } } } /* * The public interface to this module. */ void print_freebsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6) { print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames), arg1, arg2, arg3, arg4, arg5, arg6); } void print_freebsd_syscall_ret(int num, abi_long ret) { print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames)); } void print_netbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6) { print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames), arg1, arg2, arg3, arg4, arg5, arg6); } void print_netbsd_syscall_ret(int num, abi_long ret) { print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames)); } void print_openbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6) { print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames), arg1, arg2, arg3, arg4, arg5, arg6); } void print_openbsd_syscall_ret(int num, abi_long ret) { print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames)); }