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Allow tracing dlfunc() / dlsym() events.

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MFC after:	1 week
This commit is contained in:
Dag-Erling Smørgrav 2015-01-25 12:11:50 +00:00
parent d4ff1726f9
commit 4ac1e0a9fc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=277695
2 changed files with 22 additions and 4 deletions
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17
libexec/rtld-elf/rtld.c
View File

@ -266,6 +266,8 @@ bool ld_library_path_rpath = false;
#define UTRACE_PRELOAD_FINISHED 8
#define UTRACE_INIT_CALL 9
#define UTRACE_FINI_CALL 10
#define UTRACE_DLSYM_START 11
#define UTRACE_DLSYM_STOP 12
struct utrace_rtld {
char sig[4]; /* 'RTLD' */
@ -3099,6 +3101,7 @@ do_dlsym(void *handle, const char *name, void *retaddr, const Ver_Entry *ve,
SymLook req;
RtldLockState lockstate;
tls_index ti;
void *sym;
int res;
def = NULL;
@ -3108,6 +3111,7 @@ do_dlsym(void *handle, const char *name, void *retaddr, const Ver_Entry *ve,
req.flags = flags | SYMLOOK_IN_PLT;
req.lockstate = &lockstate;
LD_UTRACE(UTRACE_DLSYM_START, handle, NULL, 0, 0, name);
rlock_acquire(rtld_bind_lock, &lockstate);
if (sigsetjmp(lockstate.env, 0) != 0)
lock_upgrade(rtld_bind_lock, &lockstate);
@ -3117,6 +3121,7 @@ do_dlsym(void *handle, const char *name, void *retaddr, const Ver_Entry *ve,
if ((obj = obj_from_addr(retaddr)) == NULL) {
_rtld_error("Cannot determine caller's shared object");
lock_release(rtld_bind_lock, &lockstate);
LD_UTRACE(UTRACE_DLSYM_STOP, handle, NULL, 0, 0, name);
return NULL;
}
if (handle == NULL) { /* Just the caller's shared object. */
@ -3164,6 +3169,7 @@ do_dlsym(void *handle, const char *name, void *retaddr, const Ver_Entry *ve,
} else {
if ((obj = dlcheck(handle)) == NULL) {
lock_release(rtld_bind_lock, &lockstate);
LD_UTRACE(UTRACE_DLSYM_STOP, handle, NULL, 0, 0, name);
return NULL;
}
@ -3207,19 +3213,22 @@ do_dlsym(void *handle, const char *name, void *retaddr, const Ver_Entry *ve,
* symbol.
*/
if (ELF_ST_TYPE(def->st_info) == STT_FUNC)
return (make_function_pointer(def, defobj));
sym = make_function_pointer(def, defobj);
else if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC)
return (rtld_resolve_ifunc(defobj, def));
sym = rtld_resolve_ifunc(defobj, def);
else if (ELF_ST_TYPE(def->st_info) == STT_TLS) {
ti.ti_module = defobj->tlsindex;
ti.ti_offset = def->st_value;
return (__tls_get_addr(&ti));
sym = __tls_get_addr(&ti);
} else
return (defobj->relocbase + def->st_value);
sym = defobj->relocbase + def->st_value;
LD_UTRACE(UTRACE_DLSYM_STOP, handle, sym, 0, 0, name);
return (sym);
}
_rtld_error("Undefined symbol \"%s\"", name);
lock_release(rtld_bind_lock, &lockstate);
LD_UTRACE(UTRACE_DLSYM_STOP, handle, NULL, 0, 0, name);
return NULL;
}

9
usr.bin/kdump/kdump.c
View File

@ -1531,6 +1531,8 @@ ktrcsw(struct ktr_csw *cs)
#define UTRACE_PRELOAD_FINISHED 8
#define UTRACE_INIT_CALL 9
#define UTRACE_FINI_CALL 10
#define UTRACE_DLSYM_START 11
#define UTRACE_DLSYM_STOP 12
struct utrace_rtld {
char sig[4]; /* 'RTLD' */
@ -1610,6 +1612,13 @@ ktruser_rtld(int len, void *p)
printf("RTLD: fini %p for %p (%s)\n", ut->mapbase, ut->handle,
ut->name);
break;
case UTRACE_DLSYM_START:
printf("RTLD: dlsym(%p, %s)\n", ut->handle, ut->name);
break;
case UTRACE_DLSYM_STOP:
printf("RTLD: %p = dlsym(%p, %s)\n", ut->mapbase, ut->handle,
ut->name);
break;
default:
cp = p;
cp += 4;