kdump: Add preliminary support for decoding Linux syscalls

Reviewed by:		jhb
Differential revision:	https://reviews.freebsd.org/D35216
MFC after:		2 weeks

usr.bin/kdump/Makefile

@@ -17,4 +17,11 @@ LIBADD+=	cap_pwd
 CFLAGS+=-DWITH_CASPER
 .endif
 
+.if ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "amd64" || \
+	    ${MACHINE_CPUARCH} == "i386"
+SRCS+=		linux.c
+.endif
+
+CFLAGS.linux.c+= -I${SRCTOP}/sys
+
 .include <bsd.prog.mk>

usr.bin/kdump/kdump.c

@@ -124,6 +124,8 @@ void ktrfaultend(struct ktr_faultend *);
 void ktrkevent(struct kevent *);
 void ktrstructarray(struct ktr_struct_array *, size_t);
 void ktrbitset(char *, struct bitset *, size_t);
+void ktrsyscall_freebsd(struct ktr_syscall *ktr, register_t **resip,
+    int *resnarg, char *resc, u_int sv_flags);
 void usage(void);
 
 #define	TIMESTAMP_NONE		0x0
@@ -766,19 +768,52 @@ print_signal(int signo)
 
 void
 ktrsyscall(struct ktr_syscall *ktr, u_int sv_flags)
+{
+	int narg = ktr->ktr_narg;
+	register_t *ip;
+
+	syscallname(ktr->ktr_code, sv_flags);
+	ip = &ktr->ktr_args[0];
+	if (narg) {
+		char c = '(';
+		if (fancy) {
+			switch (sv_flags & SV_ABI_MASK) {
+			case SV_ABI_FREEBSD:
+				ktrsyscall_freebsd(ktr, &ip, &narg, &c,
+				    sv_flags);
+				break;
+#ifdef SYSDECODE_HAVE_LINUX
+			case SV_ABI_LINUX:
+#ifdef __amd64__
+				if (sv_flags & SV_ILP32)
+					ktrsyscall_linux32(ktr, &ip,
+					    &narg, &c);
+				else
+#endif
+				ktrsyscall_linux(ktr, &ip, &narg, &c);
+				break;
+#endif /* SYSDECODE_HAVE_LINUX */
+			}
+		}
+		while (narg > 0)
+			print_number(ip, narg, c);
+		putchar(')');
+	}
+	putchar('\n');
+}
+
+void
+ktrsyscall_freebsd(struct ktr_syscall *ktr, register_t **resip,
+    int *resnarg, char *resc, u_int sv_flags)
 {
 	int narg = ktr->ktr_narg;
 	register_t *ip, *first;
 	intmax_t arg;
 	int quad_align, quad_slots;
 
-	syscallname(ktr->ktr_code, sv_flags);
 	ip = first = &ktr->ktr_args[0];
-	if (narg) {
-		char c = '(';
-		if (fancy &&
-		    (sv_flags == 0 ||
-		    (sv_flags & SV_ABI_MASK) == SV_ABI_FREEBSD)) {
+	char c = *resc;
+
 			quad_align = 0;
 			if (sv_flags & SV_ILP32) {
 #ifdef __powerpc__
@@ -1510,13 +1545,9 @@ ktrsyscall(struct ktr_syscall *ktr, u_int sv_flags)
 				narg--;
 				break;
 			}
-		}
-		while (narg > 0) {
-			print_number(ip, narg, c);
-		}
-		putchar(')');
-	}
-	putchar('\n');
+	*resc = c;
+	*resip = ip;
+	*resnarg = narg;
 }
 
 void

usr.bin/kdump/kdump.h

@@ -76,4 +76,13 @@ void	print_mask_argul(bool (*decoder)(FILE *, u_long, u_long *),
 bool	print_mask_arg_part(bool (*decoder)(FILE *, int, int *),
 	    int value, int *rem);
 
+#ifdef SYSDECODE_HAVE_LINUX
+void ktrsyscall_linux(struct ktr_syscall *ktr, register_t **resip,
+    int *resnarg, char *resc);
+#ifdef __amd64__
+void ktrsyscall_linux32(struct ktr_syscall *ktr, register_t **resip,
+    int *resnarg, char *resc);
+#endif
+#endif /* SYSDECODE_HAVE_LINUX */
+
 #endif /* !__KDUMP_H__ */

usr.bin/kdump/linux.c

@@ -0,0 +1,185 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Dmitry Chagin <dchagin@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/uio.h>
+#include <sys/ktrace.h>
+#include <stddef.h>
+#include <sysdecode.h>
+
+#include "kdump.h"
+
+#ifdef __amd64__
+#include <amd64/linux/linux_syscall.h>
+#include <amd64/linux32/linux32_syscall.h>
+#elif __aarch64__
+#include <arm64/linux/linux_syscall.h>
+#elif __i386__
+#include <i386/linux/linux_syscall.h>
+#endif
+
+static void
+print_linux_signal(int signo)
+{
+	const char *signame;
+
+	signame = sysdecode_linux_signal(signo);
+	if (signame != NULL)
+		printf("%s", signame);
+	else
+		printf("SIG %d", signo);
+}
+
+void
+ktrsyscall_linux(struct ktr_syscall *ktr, register_t **resip,
+    int *resnarg, char *resc)
+{
+	int narg = ktr->ktr_narg;
+	register_t *ip, *first;
+	int quad_align, quad_slots;
+	char c;
+
+	ip = first = &ktr->ktr_args[0];
+	c = *resc;
+	quad_align = 0;
+	quad_slots = 1;
+	switch (ktr->ktr_code) {
+	case LINUX_SYS_linux_clock_gettime:
+	case LINUX_SYS_linux_clock_settime:
+	case LINUX_SYS_linux_clock_getres:
+	case LINUX_SYS_linux_timer_create:
+		putchar('(');
+		sysdecode_linux_clockid(stdout, *ip);
+		c = ',';
+		ip++;
+		narg--;
+		break;
+	case LINUX_SYS_linux_kill:
+	case LINUX_SYS_linux_tkill:
+	case LINUX_SYS_linux_rt_sigqueueinfo:
+		print_number(ip, narg, c);
+		putchar(',');
+		print_linux_signal(*ip);
+		ip++;
+		narg--;
+		break;
+	case LINUX_SYS_linux_tgkill:
+	case LINUX_SYS_linux_rt_tgsigqueueinfo:
+		print_number(ip, narg, c);
+		print_number(ip, narg, c);
+		putchar(',');
+		print_linux_signal(*ip);
+		ip++;
+		narg--;
+		break;
+	case LINUX_SYS_linux_rt_sigaction:
+		putchar('(');
+		print_linux_signal(*ip);
+		ip++;
+		narg--;
+		c = ',';
+		break;
+	case LINUX_SYS_linux_ftruncate:
+	case LINUX_SYS_linux_truncate:
+		print_number(ip, narg, c);
+		print_number64(first, ip, narg, c);
+		break;
+	}
+	*resc = c;
+	*resip = ip;
+	*resnarg = narg;
+}
+
+#if defined(__amd64__)
+void
+ktrsyscall_linux32(struct ktr_syscall *ktr, register_t **resip,
+    int *resnarg, char *resc)
+{
+	int narg = ktr->ktr_narg;
+	register_t *ip, *first;
+	int quad_align, quad_slots;
+	char c;
+
+	ip = first = &ktr->ktr_args[0];
+	c = *resc;
+	quad_align = 0;
+	quad_slots = 2;
+	switch (ktr->ktr_code) {
+	case LINUX32_SYS_linux_clock_gettime:
+	case LINUX32_SYS_linux_clock_settime:
+	case LINUX32_SYS_linux_clock_getres:
+	case LINUX32_SYS_linux_timer_create:
+	case LINUX32_SYS_linux_clock_gettime64:
+	case LINUX32_SYS_linux_clock_settime64:
+	case LINUX32_SYS_linux_clock_getres_time64:
+		putchar('(');
+		sysdecode_linux_clockid(stdout, *ip);
+		c = ',';
+		ip++;
+		narg--;
+		break;
+	case LINUX32_SYS_linux_kill:
+	case LINUX32_SYS_linux_tkill:
+	case LINUX32_SYS_linux_rt_sigqueueinfo:
+		print_number(ip, narg, c);
+		putchar(',');
+		print_linux_signal(*ip);
+		ip++;
+		narg--;
+		break;
+	case LINUX32_SYS_linux_tgkill:
+	case LINUX32_SYS_linux_rt_tgsigqueueinfo:
+		print_number(ip, narg, c);
+		print_number(ip, narg, c);
+		putchar(',');
+		print_linux_signal(*ip);
+		ip++;
+		narg--;
+		break;
+	case LINUX32_SYS_linux_signal:
+	case LINUX32_SYS_linux_sigaction:
+	case LINUX32_SYS_linux_rt_sigaction:
+		putchar('(');
+		print_linux_signal(*ip);
+		ip++;
+		narg--;
+		c = ',';
+		break;
+	case LINUX32_SYS_linux_ftruncate:
+	case LINUX32_SYS_linux_truncate:
+		print_number(ip, narg, c);
+		print_number64(first, ip, narg, c);
+		break;
+	}
+	*resc = c;
+	*resip = ip;
+	*resnarg = narg;
+}
+#endif /* __amd64__ */