Date: Fri, 12 Aug 2016 07:54:59 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r303991 - head/lib/libsysdecode Message-ID: <201608120754.u7C7sxk9025637@repo.freebsd.org>
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Author: kib Date: Fri Aug 12 07:54:59 2016 New Revision: 303991 URL: https://svnweb.freebsd.org/changeset/base/303991 Log: Decode 32bit utrace records on the 64bit host. Suppose that ktrace is performed on 32bit binary running on 64bit host. In this case, the kernel records are 64bit, while utrace records from rtld and malloc are 32bit. Make kdump useful to see decoded utrace data in that case. Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/lib/libsysdecode/utrace.c Modified: head/lib/libsysdecode/utrace.c ============================================================================== --- head/lib/libsysdecode/utrace.c Fri Aug 12 07:52:13 2016 (r303990) +++ head/lib/libsysdecode/utrace.c Fri Aug 12 07:54:59 2016 (r303991) @@ -33,7 +33,7 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <dlfcn.h> #include <stdio.h> -#include <strings.h> +#include <string.h> #include <sysdecode.h> #define UTRACE_DLOPEN_START 1 @@ -59,6 +59,18 @@ struct utrace_rtld { char name[MAXPATHLEN]; }; +#ifdef __LP64__ +struct utrace_rtld32 { + char sig[4]; /* 'RTLD' */ + int event; + uint32_t handle; + uint32_t mapbase; + uint32_t mapsize; + int refcnt; + char name[MAXPATHLEN]; +}; +#endif + static int print_utrace_rtld(FILE *fp, void *p) { @@ -145,6 +157,14 @@ struct utrace_malloc { void *r; }; +#ifdef __LP64__ +struct utrace_malloc32 { + uint32_t p; + uint32_t s; + uint32_t r; +}; +#endif + static void print_utrace_malloc(FILE *fp, void *p) { @@ -163,6 +183,12 @@ print_utrace_malloc(FILE *fp, void *p) int sysdecode_utrace(FILE *fp, void *p, size_t len) { +#ifdef __LP64__ + struct utrace_rtld ur; + struct utrace_rtld32 *pr; + struct utrace_malloc um; + struct utrace_malloc32 *pm; +#endif if (len == sizeof(struct utrace_rtld) && bcmp(p, "RTLD", 4) == 0) { return (print_utrace_rtld(fp, p)); @@ -172,6 +198,32 @@ sysdecode_utrace(FILE *fp, void *p, size print_utrace_malloc(fp, p); return (1); } - + +#ifdef __LP64__ + if (len == sizeof(struct utrace_rtld32) && bcmp(p, "RTLD", 4) == 0) { + pr = p; + memset(&ur, 0, sizeof(ur)); + memcpy(ur.sig, pr->sig, sizeof(ur.sig)); + ur.event = pr->event; + ur.handle = (void *)(uintptr_t)pr->handle; + ur.mapbase = (void *)(uintptr_t)pr->mapbase; + ur.mapsize = pr->mapsize; + ur.refcnt = pr->refcnt; + memcpy(ur.name, pr->name, sizeof(ur.name)); + return (print_utrace_rtld(fp, &ur)); + } + + if (len == sizeof(struct utrace_malloc32)) { + pm = p; + memset(&um, 0, sizeof(um)); + um.p = pm->p == (uint32_t)-1 ? (void *)(intptr_t)-1 : + (void *)(uintptr_t)pm->p; + um.s = pm->s; + um.r = (void *)(uintptr_t)pm->r; + print_utrace_malloc(fp, &um); + return (1); + } +#endif + return (0); }
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